Mercurial > hg > graal-compiler
annotate src/share/vm/memory/generation.cpp @ 2334:dbad0519a1c4
6845426: non-static <clinit> method with no args is called during the class initialization process
Summary: Only call <clinit> with ACC_STATIC for classfiles with version > 50
Reviewed-by: acorn, dholmes, coleenp
author | kamg |
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date | Fri, 04 Mar 2011 14:40:46 -0500 |
parents | f95d63e2154a |
children | 92da084fefc9 |
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 * | |
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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 "gc_implementation/shared/spaceDecorator.hpp" | |
27 #include "gc_interface/collectedHeap.inline.hpp" | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "memory/blockOffsetTable.inline.hpp" | |
30 #include "memory/cardTableRS.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "memory/genCollectedHeap.hpp" | |
33 #include "memory/genMarkSweep.hpp" | |
34 #include "memory/genOopClosures.hpp" | |
35 #include "memory/genOopClosures.inline.hpp" | |
36 #include "memory/generation.hpp" | |
37 #include "memory/generation.inline.hpp" | |
38 #include "memory/space.inline.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/java.hpp" | |
41 #include "utilities/copy.hpp" | |
42 #include "utilities/events.hpp" | |
0 | 43 |
44 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) : | |
45 _level(level), | |
46 _ref_processor(NULL) { | |
47 if (!_virtual_space.initialize(rs, initial_size)) { | |
48 vm_exit_during_initialization("Could not reserve enough space for " | |
49 "object heap"); | |
50 } | |
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51 // Mangle all of the the initial generation. |
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52 if (ZapUnusedHeapArea) { |
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53 MemRegion mangle_region((HeapWord*)_virtual_space.low(), |
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54 (HeapWord*)_virtual_space.high()); |
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55 SpaceMangler::mangle_region(mangle_region); |
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56 } |
0 | 57 _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(), |
58 (HeapWord*)_virtual_space.high_boundary()); | |
59 } | |
60 | |
61 GenerationSpec* Generation::spec() { | |
62 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
63 assert(0 <= level() && level() < gch->_n_gens, "Bad gen level"); | |
64 return gch->_gen_specs[level()]; | |
65 } | |
66 | |
67 size_t Generation::max_capacity() const { | |
68 return reserved().byte_size(); | |
69 } | |
70 | |
71 void Generation::print_heap_change(size_t prev_used) const { | |
72 if (PrintGCDetails && Verbose) { | |
73 gclog_or_tty->print(" " SIZE_FORMAT | |
74 "->" SIZE_FORMAT | |
75 "(" SIZE_FORMAT ")", | |
76 prev_used, used(), capacity()); | |
77 } else { | |
78 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
79 "->" SIZE_FORMAT "K" | |
80 "(" SIZE_FORMAT "K)", | |
81 prev_used / K, used() / K, capacity() / K); | |
82 } | |
83 } | |
84 | |
85 // By default we get a single threaded default reference processor; | |
86 // generations needing multi-threaded refs discovery override this method. | |
87 void Generation::ref_processor_init() { | |
88 assert(_ref_processor == NULL, "a reference processor already exists"); | |
89 assert(!_reserved.is_empty(), "empty generation?"); | |
90 _ref_processor = | |
91 new ReferenceProcessor(_reserved, // span | |
92 refs_discovery_is_atomic(), // atomic_discovery | |
93 refs_discovery_is_mt()); // mt_discovery | |
94 if (_ref_processor == NULL) { | |
95 vm_exit_during_initialization("Could not allocate ReferenceProcessor object"); | |
96 } | |
97 } | |
98 | |
99 void Generation::print() const { print_on(tty); } | |
100 | |
101 void Generation::print_on(outputStream* st) const { | |
102 st->print(" %-20s", name()); | |
103 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
104 capacity()/K, used()/K); | |
105 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
106 _virtual_space.low_boundary(), | |
107 _virtual_space.high(), | |
108 _virtual_space.high_boundary()); | |
109 } | |
110 | |
111 void Generation::print_summary_info() { print_summary_info_on(tty); } | |
112 | |
113 void Generation::print_summary_info_on(outputStream* st) { | |
114 StatRecord* sr = stat_record(); | |
115 double time = sr->accumulated_time.seconds(); | |
116 st->print_cr("[Accumulated GC generation %d time %3.7f secs, " | |
117 "%d GC's, avg GC time %3.7f]", | |
118 level(), time, sr->invocations, | |
119 sr->invocations > 0 ? time / sr->invocations : 0.0); | |
120 } | |
121 | |
122 // Utility iterator classes | |
123 | |
124 class GenerationIsInReservedClosure : public SpaceClosure { | |
125 public: | |
126 const void* _p; | |
127 Space* sp; | |
128 virtual void do_space(Space* s) { | |
129 if (sp == NULL) { | |
130 if (s->is_in_reserved(_p)) sp = s; | |
131 } | |
132 } | |
133 GenerationIsInReservedClosure(const void* p) : _p(p), sp(NULL) {} | |
134 }; | |
135 | |
136 class GenerationIsInClosure : public SpaceClosure { | |
137 public: | |
138 const void* _p; | |
139 Space* sp; | |
140 virtual void do_space(Space* s) { | |
141 if (sp == NULL) { | |
142 if (s->is_in(_p)) sp = s; | |
143 } | |
144 } | |
145 GenerationIsInClosure(const void* p) : _p(p), sp(NULL) {} | |
146 }; | |
147 | |
148 bool Generation::is_in(const void* p) const { | |
149 GenerationIsInClosure blk(p); | |
150 ((Generation*)this)->space_iterate(&blk); | |
151 return blk.sp != NULL; | |
152 } | |
153 | |
154 DefNewGeneration* Generation::as_DefNewGeneration() { | |
155 assert((kind() == Generation::DefNew) || | |
156 (kind() == Generation::ParNew) || | |
157 (kind() == Generation::ASParNew), | |
158 "Wrong youngest generation type"); | |
159 return (DefNewGeneration*) this; | |
160 } | |
161 | |
162 Generation* Generation::next_gen() const { | |
163 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
164 int next = level() + 1; | |
165 if (next < gch->_n_gens) { | |
166 return gch->_gens[next]; | |
167 } else { | |
168 return NULL; | |
169 } | |
170 } | |
171 | |
172 size_t Generation::max_contiguous_available() const { | |
173 // The largest number of contiguous free words in this or any higher generation. | |
174 size_t max = 0; | |
175 for (const Generation* gen = this; gen != NULL; gen = gen->next_gen()) { | |
176 size_t avail = gen->contiguous_available(); | |
177 if (avail > max) { | |
178 max = avail; | |
179 } | |
180 } | |
181 return max; | |
182 } | |
183 | |
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184 bool Generation::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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185 size_t available = max_contiguous_available(); |
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186 bool res = (available >= max_promotion_in_bytes); |
0 | 187 if (PrintGC && Verbose) { |
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188 gclog_or_tty->print_cr( |
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189 "Generation: promo attempt is%s safe: available("SIZE_FORMAT") %s max_promo("SIZE_FORMAT")", |
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190 res? "":" not", available, res? ">=":"<", |
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191 max_promotion_in_bytes); |
0 | 192 } |
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193 return res; |
0 | 194 } |
195 | |
196 // Ignores "ref" and calls allocate(). | |
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197 oop Generation::promote(oop obj, size_t obj_size) { |
0 | 198 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
199 | |
200 #ifndef PRODUCT | |
201 if (Universe::heap()->promotion_should_fail()) { | |
202 return NULL; | |
203 } | |
204 #endif // #ifndef PRODUCT | |
205 | |
206 HeapWord* result = allocate(obj_size, false); | |
207 if (result != NULL) { | |
208 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
209 return oop(result); | |
210 } else { | |
211 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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212 return gch->handle_failed_promotion(this, obj, obj_size); |
0 | 213 } |
214 } | |
215 | |
216 oop Generation::par_promote(int thread_num, | |
217 oop obj, markOop m, size_t word_sz) { | |
218 // Could do a bad general impl here that gets a lock. But no. | |
219 ShouldNotCallThis(); | |
220 return NULL; | |
221 } | |
222 | |
223 void Generation::par_promote_alloc_undo(int thread_num, | |
224 HeapWord* obj, size_t word_sz) { | |
225 // Could do a bad general impl here that gets a lock. But no. | |
226 guarantee(false, "No good general implementation."); | |
227 } | |
228 | |
229 Space* Generation::space_containing(const void* p) const { | |
230 GenerationIsInReservedClosure blk(p); | |
231 // Cast away const | |
232 ((Generation*)this)->space_iterate(&blk); | |
233 return blk.sp; | |
234 } | |
235 | |
236 // Some of these are mediocre general implementations. Should be | |
237 // overridden to get better performance. | |
238 | |
239 class GenerationBlockStartClosure : public SpaceClosure { | |
240 public: | |
241 const void* _p; | |
242 HeapWord* _start; | |
243 virtual void do_space(Space* s) { | |
244 if (_start == NULL && s->is_in_reserved(_p)) { | |
245 _start = s->block_start(_p); | |
246 } | |
247 } | |
248 GenerationBlockStartClosure(const void* p) { _p = p; _start = NULL; } | |
249 }; | |
250 | |
251 HeapWord* Generation::block_start(const void* p) const { | |
252 GenerationBlockStartClosure blk(p); | |
253 // Cast away const | |
254 ((Generation*)this)->space_iterate(&blk); | |
255 return blk._start; | |
256 } | |
257 | |
258 class GenerationBlockSizeClosure : public SpaceClosure { | |
259 public: | |
260 const HeapWord* _p; | |
261 size_t size; | |
262 virtual void do_space(Space* s) { | |
263 if (size == 0 && s->is_in_reserved(_p)) { | |
264 size = s->block_size(_p); | |
265 } | |
266 } | |
267 GenerationBlockSizeClosure(const HeapWord* p) { _p = p; size = 0; } | |
268 }; | |
269 | |
270 size_t Generation::block_size(const HeapWord* p) const { | |
271 GenerationBlockSizeClosure blk(p); | |
272 // Cast away const | |
273 ((Generation*)this)->space_iterate(&blk); | |
274 assert(blk.size > 0, "seems reasonable"); | |
275 return blk.size; | |
276 } | |
277 | |
278 class GenerationBlockIsObjClosure : public SpaceClosure { | |
279 public: | |
280 const HeapWord* _p; | |
281 bool is_obj; | |
282 virtual void do_space(Space* s) { | |
283 if (!is_obj && s->is_in_reserved(_p)) { | |
284 is_obj |= s->block_is_obj(_p); | |
285 } | |
286 } | |
287 GenerationBlockIsObjClosure(const HeapWord* p) { _p = p; is_obj = false; } | |
288 }; | |
289 | |
290 bool Generation::block_is_obj(const HeapWord* p) const { | |
291 GenerationBlockIsObjClosure blk(p); | |
292 // Cast away const | |
293 ((Generation*)this)->space_iterate(&blk); | |
294 return blk.is_obj; | |
295 } | |
296 | |
297 class GenerationOopIterateClosure : public SpaceClosure { | |
298 public: | |
299 OopClosure* cl; | |
300 MemRegion mr; | |
301 virtual void do_space(Space* s) { | |
302 s->oop_iterate(mr, cl); | |
303 } | |
304 GenerationOopIterateClosure(OopClosure* _cl, MemRegion _mr) : | |
305 cl(_cl), mr(_mr) {} | |
306 }; | |
307 | |
308 void Generation::oop_iterate(OopClosure* cl) { | |
309 GenerationOopIterateClosure blk(cl, _reserved); | |
310 space_iterate(&blk); | |
311 } | |
312 | |
313 void Generation::oop_iterate(MemRegion mr, OopClosure* cl) { | |
314 GenerationOopIterateClosure blk(cl, mr); | |
315 space_iterate(&blk); | |
316 } | |
317 | |
318 void Generation::younger_refs_in_space_iterate(Space* sp, | |
319 OopsInGenClosure* cl) { | |
320 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
321 rs->younger_refs_in_space_iterate(sp, cl); | |
322 } | |
323 | |
324 class GenerationObjIterateClosure : public SpaceClosure { | |
325 private: | |
326 ObjectClosure* _cl; | |
327 public: | |
328 virtual void do_space(Space* s) { | |
329 s->object_iterate(_cl); | |
330 } | |
331 GenerationObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} | |
332 }; | |
333 | |
334 void Generation::object_iterate(ObjectClosure* cl) { | |
335 GenerationObjIterateClosure blk(cl); | |
336 space_iterate(&blk); | |
337 } | |
338 | |
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339 class GenerationSafeObjIterateClosure : public SpaceClosure { |
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340 private: |
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341 ObjectClosure* _cl; |
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342 public: |
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343 virtual void do_space(Space* s) { |
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344 s->safe_object_iterate(_cl); |
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345 } |
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346 GenerationSafeObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} |
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347 }; |
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348 |
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349 void Generation::safe_object_iterate(ObjectClosure* cl) { |
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350 GenerationSafeObjIterateClosure blk(cl); |
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351 space_iterate(&blk); |
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352 } |
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353 |
0 | 354 void Generation::prepare_for_compaction(CompactPoint* cp) { |
355 // Generic implementation, can be specialized | |
356 CompactibleSpace* space = first_compaction_space(); | |
357 while (space != NULL) { | |
358 space->prepare_for_compaction(cp); | |
359 space = space->next_compaction_space(); | |
360 } | |
361 } | |
362 | |
363 class AdjustPointersClosure: public SpaceClosure { | |
364 public: | |
365 void do_space(Space* sp) { | |
366 sp->adjust_pointers(); | |
367 } | |
368 }; | |
369 | |
370 void Generation::adjust_pointers() { | |
371 // Note that this is done over all spaces, not just the compactible | |
372 // ones. | |
373 AdjustPointersClosure blk; | |
374 space_iterate(&blk, true); | |
375 } | |
376 | |
377 void Generation::compact() { | |
378 CompactibleSpace* sp = first_compaction_space(); | |
379 while (sp != NULL) { | |
380 sp->compact(); | |
381 sp = sp->next_compaction_space(); | |
382 } | |
383 } | |
384 | |
385 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, | |
386 int level, | |
387 GenRemSet* remset) : | |
388 Generation(rs, initial_byte_size, level), _rs(remset) | |
389 { | |
390 HeapWord* start = (HeapWord*)rs.base(); | |
391 size_t reserved_byte_size = rs.size(); | |
392 assert((uintptr_t(start) & 3) == 0, "bad alignment"); | |
393 assert((reserved_byte_size & 3) == 0, "bad alignment"); | |
394 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); | |
395 _bts = new BlockOffsetSharedArray(reserved_mr, | |
396 heap_word_size(initial_byte_size)); | |
397 MemRegion committed_mr(start, heap_word_size(initial_byte_size)); | |
398 _rs->resize_covered_region(committed_mr); | |
399 if (_bts == NULL) | |
400 vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); | |
401 | |
402 // Verify that the start and end of this generation is the start of a card. | |
403 // If this wasn't true, a single card could span more than on generation, | |
404 // which would cause problems when we commit/uncommit memory, and when we | |
405 // clear and dirty cards. | |
406 guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); | |
407 if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { | |
408 // Don't check at the very end of the heap as we'll assert that we're probing off | |
409 // the end if we try. | |
410 guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); | |
411 } | |
412 } | |
413 | |
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414 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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415 assert_locked_or_safepoint(Heap_lock); |
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416 if (bytes == 0) { |
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417 return true; // That's what grow_by(0) would return |
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418 } |
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419 size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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420 if (aligned_bytes == 0){ |
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421 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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422 // return true with the implication that an expansion was done when it |
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423 // was not. A call to expand implies a best effort to expand by "bytes" |
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424 // but not a guarantee. Align down to give a best effort. This is likely |
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425 // the most that the generation can expand since it has some capacity to |
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426 // start with. |
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427 aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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428 } |
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429 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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430 bool success = false; |
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431 if (aligned_expand_bytes > aligned_bytes) { |
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432 success = grow_by(aligned_expand_bytes); |
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433 } |
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434 if (!success) { |
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435 success = grow_by(aligned_bytes); |
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436 } |
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437 if (!success) { |
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438 success = grow_to_reserved(); |
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439 } |
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440 if (PrintGC && Verbose) { |
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441 if (success && GC_locker::is_active()) { |
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442 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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443 } |
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444 } |
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445 |
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446 return success; |
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447 } |
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448 |
0 | 449 |
450 // No young generation references, clear this generation's cards. | |
451 void CardGeneration::clear_remembered_set() { | |
452 _rs->clear(reserved()); | |
453 } | |
454 | |
455 | |
456 // Objects in this generation may have moved, invalidate this | |
457 // generation's cards. | |
458 void CardGeneration::invalidate_remembered_set() { | |
459 _rs->invalidate(used_region()); | |
460 } | |
461 | |
462 | |
463 // Currently nothing to do. | |
464 void CardGeneration::prepare_for_verify() {} | |
465 | |
466 | |
467 void OneContigSpaceCardGeneration::collect(bool full, | |
468 bool clear_all_soft_refs, | |
469 size_t size, | |
470 bool is_tlab) { | |
471 SpecializationStats::clear(); | |
472 // Temporarily expand the span of our ref processor, so | |
473 // refs discovery is over the entire heap, not just this generation | |
474 ReferenceProcessorSpanMutator | |
475 x(ref_processor(), GenCollectedHeap::heap()->reserved_region()); | |
476 GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs); | |
477 SpecializationStats::print(); | |
478 } | |
479 | |
480 HeapWord* | |
481 OneContigSpaceCardGeneration::expand_and_allocate(size_t word_size, | |
482 bool is_tlab, | |
483 bool parallel) { | |
484 assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation"); | |
485 if (parallel) { | |
486 MutexLocker x(ParGCRareEvent_lock); | |
487 HeapWord* result = NULL; | |
488 size_t byte_size = word_size * HeapWordSize; | |
489 while (true) { | |
490 expand(byte_size, _min_heap_delta_bytes); | |
491 if (GCExpandToAllocateDelayMillis > 0) { | |
492 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
493 } | |
494 result = _the_space->par_allocate(word_size); | |
495 if ( result != NULL) { | |
496 return result; | |
497 } else { | |
498 // If there's not enough expansion space available, give up. | |
499 if (_virtual_space.uncommitted_size() < byte_size) { | |
500 return NULL; | |
501 } | |
502 // else try again | |
503 } | |
504 } | |
505 } else { | |
506 expand(word_size*HeapWordSize, _min_heap_delta_bytes); | |
507 return _the_space->allocate(word_size); | |
508 } | |
509 } | |
510 | |
271
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511 bool OneContigSpaceCardGeneration::expand(size_t bytes, size_t expand_bytes) { |
0 | 512 GCMutexLocker x(ExpandHeap_lock); |
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513 return CardGeneration::expand(bytes, expand_bytes); |
0 | 514 } |
515 | |
516 | |
517 void OneContigSpaceCardGeneration::shrink(size_t bytes) { | |
518 assert_locked_or_safepoint(ExpandHeap_lock); | |
519 size_t size = ReservedSpace::page_align_size_down(bytes); | |
520 if (size > 0) { | |
521 shrink_by(size); | |
522 } | |
523 } | |
524 | |
525 | |
526 size_t OneContigSpaceCardGeneration::capacity() const { | |
527 return _the_space->capacity(); | |
528 } | |
529 | |
530 | |
531 size_t OneContigSpaceCardGeneration::used() const { | |
532 return _the_space->used(); | |
533 } | |
534 | |
535 | |
536 size_t OneContigSpaceCardGeneration::free() const { | |
537 return _the_space->free(); | |
538 } | |
539 | |
540 MemRegion OneContigSpaceCardGeneration::used_region() const { | |
541 return the_space()->used_region(); | |
542 } | |
543 | |
544 size_t OneContigSpaceCardGeneration::unsafe_max_alloc_nogc() const { | |
545 return _the_space->free(); | |
546 } | |
547 | |
548 size_t OneContigSpaceCardGeneration::contiguous_available() const { | |
549 return _the_space->free() + _virtual_space.uncommitted_size(); | |
550 } | |
551 | |
552 bool OneContigSpaceCardGeneration::grow_by(size_t bytes) { | |
553 assert_locked_or_safepoint(ExpandHeap_lock); | |
554 bool result = _virtual_space.expand_by(bytes); | |
555 if (result) { | |
556 size_t new_word_size = | |
557 heap_word_size(_virtual_space.committed_size()); | |
558 MemRegion mr(_the_space->bottom(), new_word_size); | |
559 // Expand card table | |
560 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
561 // Expand shared block offset array | |
562 _bts->resize(new_word_size); | |
563 | |
564 // Fix for bug #4668531 | |
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565 if (ZapUnusedHeapArea) { |
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566 MemRegion mangle_region(_the_space->end(), |
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567 (HeapWord*)_virtual_space.high()); |
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568 SpaceMangler::mangle_region(mangle_region); |
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569 } |
0 | 570 |
571 // Expand space -- also expands space's BOT | |
572 // (which uses (part of) shared array above) | |
573 _the_space->set_end((HeapWord*)_virtual_space.high()); | |
574 | |
575 // update the space and generation capacity counters | |
576 update_counters(); | |
577 | |
578 if (Verbose && PrintGC) { | |
579 size_t new_mem_size = _virtual_space.committed_size(); | |
580 size_t old_mem_size = new_mem_size - bytes; | |
581 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
582 SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
583 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
584 } | |
585 } | |
586 return result; | |
587 } | |
588 | |
589 | |
590 bool OneContigSpaceCardGeneration::grow_to_reserved() { | |
591 assert_locked_or_safepoint(ExpandHeap_lock); | |
592 bool success = true; | |
593 const size_t remaining_bytes = _virtual_space.uncommitted_size(); | |
594 if (remaining_bytes > 0) { | |
595 success = grow_by(remaining_bytes); | |
596 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) | |
597 } | |
598 return success; | |
599 } | |
600 | |
601 void OneContigSpaceCardGeneration::shrink_by(size_t bytes) { | |
602 assert_locked_or_safepoint(ExpandHeap_lock); | |
603 // Shrink committed space | |
604 _virtual_space.shrink_by(bytes); | |
605 // Shrink space; this also shrinks the space's BOT | |
606 _the_space->set_end((HeapWord*) _virtual_space.high()); | |
607 size_t new_word_size = heap_word_size(_the_space->capacity()); | |
608 // Shrink the shared block offset array | |
609 _bts->resize(new_word_size); | |
610 MemRegion mr(_the_space->bottom(), new_word_size); | |
611 // Shrink the card table | |
612 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
613 | |
614 if (Verbose && PrintGC) { | |
615 size_t new_mem_size = _virtual_space.committed_size(); | |
616 size_t old_mem_size = new_mem_size + bytes; | |
617 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
618 name(), old_mem_size/K, new_mem_size/K); | |
619 } | |
620 } | |
621 | |
622 // Currently nothing to do. | |
623 void OneContigSpaceCardGeneration::prepare_for_verify() {} | |
624 | |
625 | |
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626 // Override for a card-table generation with one contiguous |
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627 // space. NOTE: For reasons that are lost in the fog of history, |
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628 // this code is used when you iterate over perm gen objects, |
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629 // even when one uses CDS, where the perm gen has a couple of |
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630 // other spaces; this is because CompactingPermGenGen derives |
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631 // from OneContigSpaceCardGeneration. This should be cleaned up, |
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632 // see CR 6897789.. |
0 | 633 void OneContigSpaceCardGeneration::object_iterate(ObjectClosure* blk) { |
634 _the_space->object_iterate(blk); | |
635 } | |
636 | |
637 void OneContigSpaceCardGeneration::space_iterate(SpaceClosure* blk, | |
638 bool usedOnly) { | |
639 blk->do_space(_the_space); | |
640 } | |
641 | |
642 void OneContigSpaceCardGeneration::object_iterate_since_last_GC(ObjectClosure* blk) { | |
643 // Deal with delayed initialization of _the_space, | |
644 // and lack of initialization of _last_gc. | |
645 if (_last_gc.space() == NULL) { | |
646 assert(the_space() != NULL, "shouldn't be NULL"); | |
647 _last_gc = the_space()->bottom_mark(); | |
648 } | |
649 the_space()->object_iterate_from(_last_gc, blk); | |
650 } | |
651 | |
652 void OneContigSpaceCardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { | |
653 blk->set_generation(this); | |
654 younger_refs_in_space_iterate(_the_space, blk); | |
655 blk->reset_generation(); | |
656 } | |
657 | |
658 void OneContigSpaceCardGeneration::save_marks() { | |
659 _the_space->set_saved_mark(); | |
660 } | |
661 | |
662 | |
663 void OneContigSpaceCardGeneration::reset_saved_marks() { | |
664 _the_space->reset_saved_mark(); | |
665 } | |
666 | |
667 | |
668 bool OneContigSpaceCardGeneration::no_allocs_since_save_marks() { | |
669 return _the_space->saved_mark_at_top(); | |
670 } | |
671 | |
672 #define OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
673 \ | |
674 void OneContigSpaceCardGeneration:: \ | |
675 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
676 blk->set_generation(this); \ | |
677 _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \ | |
678 blk->reset_generation(); \ | |
679 save_marks(); \ | |
680 } | |
681 | |
682 ALL_SINCE_SAVE_MARKS_CLOSURES(OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
683 | |
684 #undef OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN | |
685 | |
686 | |
687 void OneContigSpaceCardGeneration::gc_epilogue(bool full) { | |
688 _last_gc = WaterMark(the_space(), the_space()->top()); | |
689 | |
690 // update the generation and space performance counters | |
691 update_counters(); | |
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692 if (ZapUnusedHeapArea) { |
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693 the_space()->check_mangled_unused_area_complete(); |
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694 } |
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695 } |
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696 |
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697 void OneContigSpaceCardGeneration::record_spaces_top() { |
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698 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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699 the_space()->set_top_for_allocations(); |
0 | 700 } |
701 | |
702 void OneContigSpaceCardGeneration::verify(bool allow_dirty) { | |
703 the_space()->verify(allow_dirty); | |
704 } | |
705 | |
706 void OneContigSpaceCardGeneration::print_on(outputStream* st) const { | |
707 Generation::print_on(st); | |
708 st->print(" the"); | |
709 the_space()->print_on(st); | |
710 } |