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annotate src/share/vm/memory/defNewGeneration.hpp @ 2004:4da76e32c0be
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 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 #ifndef SHARE_VM_MEMORY_DEFNEWGENERATION_HPP |
26 #define SHARE_VM_MEMORY_DEFNEWGENERATION_HPP | |
27 | |
28 #include "gc_implementation/shared/ageTable.hpp" | |
29 #include "gc_implementation/shared/cSpaceCounters.hpp" | |
30 #include "gc_implementation/shared/generationCounters.hpp" | |
31 #include "memory/generation.inline.hpp" | |
32 #include "utilities/stack.hpp" | |
33 | |
0 | 34 class EdenSpace; |
35 class ContiguousSpace; | |
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36 class ScanClosure; |
0 | 37 |
38 // DefNewGeneration is a young generation containing eden, from- and | |
39 // to-space. | |
40 | |
41 class DefNewGeneration: public Generation { | |
42 friend class VMStructs; | |
43 | |
44 protected: | |
45 Generation* _next_gen; | |
46 int _tenuring_threshold; // Tenuring threshold for next collection. | |
47 ageTable _age_table; | |
48 // Size of object to pretenure in words; command line provides bytes | |
49 size_t _pretenure_size_threshold_words; | |
50 | |
51 ageTable* age_table() { return &_age_table; } | |
52 // Initialize state to optimistically assume no promotion failure will | |
53 // happen. | |
54 void init_assuming_no_promotion_failure(); | |
55 // True iff a promotion has failed in the current collection. | |
56 bool _promotion_failed; | |
57 bool promotion_failed() { return _promotion_failed; } | |
58 | |
59 // Handling promotion failure. A young generation collection | |
60 // can fail if a live object cannot be copied out of its | |
61 // location in eden or from-space during the collection. If | |
62 // a collection fails, the young generation is left in a | |
63 // consistent state such that it can be collected by a | |
64 // full collection. | |
65 // Before the collection | |
66 // Objects are in eden or from-space | |
67 // All roots into the young generation point into eden or from-space. | |
68 // | |
69 // After a failed collection | |
70 // Objects may be in eden, from-space, or to-space | |
71 // An object A in eden or from-space may have a copy B | |
72 // in to-space. If B exists, all roots that once pointed | |
73 // to A must now point to B. | |
74 // All objects in the young generation are unmarked. | |
75 // Eden, from-space, and to-space will all be collected by | |
76 // the full collection. | |
77 void handle_promotion_failure(oop); | |
78 | |
79 // In the absence of promotion failure, we wouldn't look at "from-space" | |
80 // objects after a young-gen collection. When promotion fails, however, | |
81 // the subsequent full collection will look at from-space objects: | |
82 // therefore we must remove their forwarding pointers. | |
83 void remove_forwarding_pointers(); | |
84 | |
85 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
86 // word being overwritten with a self-forwarding-pointer. | |
87 void preserve_mark_if_necessary(oop obj, markOop m); | |
88 | |
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89 // Together, these keep <object with a preserved mark, mark value> pairs. |
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90 // They should always contain the same number of elements. |
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91 Stack<oop> _objs_with_preserved_marks; |
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92 Stack<markOop> _preserved_marks_of_objs; |
0 | 93 |
94 // Promotion failure handling | |
95 OopClosure *_promo_failure_scan_stack_closure; | |
96 void set_promo_failure_scan_stack_closure(OopClosure *scan_stack_closure) { | |
97 _promo_failure_scan_stack_closure = scan_stack_closure; | |
98 } | |
99 | |
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100 Stack<oop> _promo_failure_scan_stack; |
0 | 101 void drain_promo_failure_scan_stack(void); |
102 bool _promo_failure_drain_in_progress; | |
103 | |
104 // Performance Counters | |
105 GenerationCounters* _gen_counters; | |
106 CSpaceCounters* _eden_counters; | |
107 CSpaceCounters* _from_counters; | |
108 CSpaceCounters* _to_counters; | |
109 | |
110 // sizing information | |
111 size_t _max_eden_size; | |
112 size_t _max_survivor_size; | |
113 | |
114 // Allocation support | |
115 bool _should_allocate_from_space; | |
116 bool should_allocate_from_space() const { | |
117 return _should_allocate_from_space; | |
118 } | |
119 void clear_should_allocate_from_space() { | |
120 _should_allocate_from_space = false; | |
121 } | |
122 void set_should_allocate_from_space() { | |
123 _should_allocate_from_space = true; | |
124 } | |
125 | |
126 protected: | |
127 // Spaces | |
128 EdenSpace* _eden_space; | |
129 ContiguousSpace* _from_space; | |
130 ContiguousSpace* _to_space; | |
131 | |
132 enum SomeProtectedConstants { | |
133 // Generations are GenGrain-aligned and have size that are multiples of | |
134 // GenGrain. | |
135 MinFreeScratchWords = 100 | |
136 }; | |
137 | |
138 // Return the size of a survivor space if this generation were of size | |
139 // gen_size. | |
140 size_t compute_survivor_size(size_t gen_size, size_t alignment) const { | |
141 size_t n = gen_size / (SurvivorRatio + 2); | |
142 return n > alignment ? align_size_down(n, alignment) : alignment; | |
143 } | |
144 | |
145 public: // was "protected" but caused compile error on win32 | |
146 class IsAliveClosure: public BoolObjectClosure { | |
147 Generation* _g; | |
148 public: | |
149 IsAliveClosure(Generation* g); | |
150 void do_object(oop p); | |
151 bool do_object_b(oop p); | |
152 }; | |
153 | |
154 class KeepAliveClosure: public OopClosure { | |
155 protected: | |
156 ScanWeakRefClosure* _cl; | |
157 CardTableRS* _rs; | |
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158 template <class T> void do_oop_work(T* p); |
0 | 159 public: |
160 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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161 virtual void do_oop(oop* p); |
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162 virtual void do_oop(narrowOop* p); |
0 | 163 }; |
164 | |
165 class FastKeepAliveClosure: public KeepAliveClosure { | |
166 protected: | |
167 HeapWord* _boundary; | |
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168 template <class T> void do_oop_work(T* p); |
0 | 169 public: |
170 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl); | |
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171 virtual void do_oop(oop* p); |
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172 virtual void do_oop(narrowOop* p); |
0 | 173 }; |
174 | |
175 class EvacuateFollowersClosure: public VoidClosure { | |
176 GenCollectedHeap* _gch; | |
177 int _level; | |
178 ScanClosure* _scan_cur_or_nonheap; | |
179 ScanClosure* _scan_older; | |
180 public: | |
181 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
182 ScanClosure* cur, ScanClosure* older); | |
183 void do_void(); | |
184 }; | |
185 | |
186 class FastEvacuateFollowersClosure: public VoidClosure { | |
187 GenCollectedHeap* _gch; | |
188 int _level; | |
189 DefNewGeneration* _gen; | |
190 FastScanClosure* _scan_cur_or_nonheap; | |
191 FastScanClosure* _scan_older; | |
192 public: | |
193 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
194 DefNewGeneration* gen, | |
195 FastScanClosure* cur, | |
196 FastScanClosure* older); | |
197 void do_void(); | |
198 }; | |
199 | |
200 public: | |
201 DefNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level, | |
202 const char* policy="Copy"); | |
203 | |
204 virtual Generation::Name kind() { return Generation::DefNew; } | |
205 | |
206 // Accessing spaces | |
207 EdenSpace* eden() const { return _eden_space; } | |
208 ContiguousSpace* from() const { return _from_space; } | |
209 ContiguousSpace* to() const { return _to_space; } | |
210 | |
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211 virtual CompactibleSpace* first_compaction_space() const; |
0 | 212 |
213 // Space enquiries | |
214 size_t capacity() const; | |
215 size_t used() const; | |
216 size_t free() const; | |
217 size_t max_capacity() const; | |
218 size_t capacity_before_gc() const; | |
219 size_t unsafe_max_alloc_nogc() const; | |
220 size_t contiguous_available() const; | |
221 | |
222 size_t max_eden_size() const { return _max_eden_size; } | |
223 size_t max_survivor_size() const { return _max_survivor_size; } | |
224 | |
225 bool supports_inline_contig_alloc() const { return true; } | |
226 HeapWord** top_addr() const; | |
227 HeapWord** end_addr() const; | |
228 | |
229 // Thread-local allocation buffers | |
230 bool supports_tlab_allocation() const { return true; } | |
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231 size_t tlab_capacity() const; |
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232 size_t unsafe_max_tlab_alloc() const; |
0 | 233 |
234 // Grow the generation by the specified number of bytes. | |
235 // The size of bytes is assumed to be properly aligned. | |
236 // Return true if the expansion was successful. | |
237 bool expand(size_t bytes); | |
238 | |
239 // DefNewGeneration cannot currently expand except at | |
240 // a GC. | |
241 virtual bool is_maximal_no_gc() const { return true; } | |
242 | |
243 // Iteration | |
244 void object_iterate(ObjectClosure* blk); | |
245 void object_iterate_since_last_GC(ObjectClosure* cl); | |
246 | |
247 void younger_refs_iterate(OopsInGenClosure* cl); | |
248 | |
249 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
250 | |
251 // Allocation support | |
252 virtual bool should_allocate(size_t word_size, bool is_tlab) { | |
253 assert(UseTLAB || !is_tlab, "Should not allocate tlab"); | |
254 | |
255 size_t overflow_limit = (size_t)1 << (BitsPerSize_t - LogHeapWordSize); | |
256 | |
257 const bool non_zero = word_size > 0; | |
258 const bool overflows = word_size >= overflow_limit; | |
259 const bool check_too_big = _pretenure_size_threshold_words > 0; | |
260 const bool not_too_big = word_size < _pretenure_size_threshold_words; | |
261 const bool size_ok = is_tlab || !check_too_big || not_too_big; | |
262 | |
263 bool result = !overflows && | |
264 non_zero && | |
265 size_ok; | |
266 | |
267 return result; | |
268 } | |
269 | |
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270 HeapWord* allocate(size_t word_size, bool is_tlab); |
0 | 271 HeapWord* allocate_from_space(size_t word_size); |
272 | |
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273 HeapWord* par_allocate(size_t word_size, bool is_tlab); |
0 | 274 |
275 // Prologue & Epilogue | |
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276 virtual void gc_prologue(bool full); |
0 | 277 virtual void gc_epilogue(bool full); |
278 | |
263
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279 // Save the tops for eden, from, and to |
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280 virtual void record_spaces_top(); |
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281 |
0 | 282 // Doesn't require additional work during GC prologue and epilogue |
283 virtual bool performs_in_place_marking() const { return false; } | |
284 | |
285 // Accessing marks | |
286 void save_marks(); | |
287 void reset_saved_marks(); | |
288 bool no_allocs_since_save_marks(); | |
289 | |
290 // Need to declare the full complement of closures, whether we'll | |
291 // override them or not, or get message from the compiler: | |
292 // oop_since_save_marks_iterate_nv hides virtual function... | |
293 #define DefNew_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
294 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
295 | |
296 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DECL) | |
297 | |
298 #undef DefNew_SINCE_SAVE_MARKS_DECL | |
299 | |
300 // For non-youngest collection, the DefNewGeneration can contribute | |
301 // "to-space". | |
263
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302 virtual void contribute_scratch(ScratchBlock*& list, Generation* requestor, |
0 | 303 size_t max_alloc_words); |
304 | |
263
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305 // Reset for contribution of "to-space". |
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306 virtual void reset_scratch(); |
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307 |
0 | 308 // GC support |
309 virtual void compute_new_size(); | |
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310 |
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311 // Returns true if the collection is likely to be safely |
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312 // completed. Even if this method returns true, a collection |
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313 // may not be guaranteed to succeed, and the system should be |
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314 // able to safely unwind and recover from that failure, albeit |
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315 // at some additional cost. Override superclass's implementation. |
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316 virtual bool collection_attempt_is_safe(); |
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317 |
0 | 318 virtual void collect(bool full, |
319 bool clear_all_soft_refs, | |
320 size_t size, | |
321 bool is_tlab); | |
322 HeapWord* expand_and_allocate(size_t size, | |
323 bool is_tlab, | |
324 bool parallel = false); | |
325 | |
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326 oop copy_to_survivor_space(oop old); |
0 | 327 int tenuring_threshold() { return _tenuring_threshold; } |
328 | |
329 // Performance Counter support | |
330 void update_counters(); | |
331 | |
332 // Printing | |
333 virtual const char* name() const; | |
334 virtual const char* short_name() const { return "DefNew"; } | |
335 | |
336 bool must_be_youngest() const { return true; } | |
337 bool must_be_oldest() const { return false; } | |
338 | |
339 // PrintHeapAtGC support. | |
340 void print_on(outputStream* st) const; | |
341 | |
342 void verify(bool allow_dirty); | |
343 | |
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344 bool promo_failure_scan_is_complete() const { |
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345 return _promo_failure_scan_stack.is_empty(); |
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346 } |
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347 |
0 | 348 protected: |
263
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349 // If clear_space is true, clear the survivor spaces. Eden is |
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350 // cleared if the minimum size of eden is 0. If mangle_space |
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351 // is true, also mangle the space in debug mode. |
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352 void compute_space_boundaries(uintx minimum_eden_size, |
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353 bool clear_space, |
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354 bool mangle_space); |
0 | 355 // Scavenge support |
356 void swap_spaces(); | |
357 }; | |
1972 | 358 |
359 #endif // SHARE_VM_MEMORY_DEFNEWGENERATION_HPP |