Mercurial > hg > graal-compiler
annotate src/share/vm/memory/defNewGeneration.hpp @ 9809:a8a5d5832def
first step towards extensibility of the escape analysis phase
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 17 May 2013 16:47:13 +0200 |
parents | a30e7b564541 |
children | 001ec9515f84 |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 2001, 2012, 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; | |
6818 | 46 uint _tenuring_threshold; // Tenuring threshold for next collection. |
0 | 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); | |
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88 void preserve_mark(oop obj, markOop m); // work routine used by the above |
0 | 89 |
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90 // Together, these keep <object with a preserved mark, mark value> pairs. |
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91 // They should always contain the same number of elements. |
6197 | 92 Stack<oop, mtGC> _objs_with_preserved_marks; |
93 Stack<markOop, mtGC> _preserved_marks_of_objs; | |
0 | 94 |
95 // Promotion failure handling | |
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96 ExtendedOopClosure *_promo_failure_scan_stack_closure; |
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97 void set_promo_failure_scan_stack_closure(ExtendedOopClosure *scan_stack_closure) { |
0 | 98 _promo_failure_scan_stack_closure = scan_stack_closure; |
99 } | |
100 | |
6197 | 101 Stack<oop, mtGC> _promo_failure_scan_stack; |
0 | 102 void drain_promo_failure_scan_stack(void); |
103 bool _promo_failure_drain_in_progress; | |
104 | |
105 // Performance Counters | |
106 GenerationCounters* _gen_counters; | |
107 CSpaceCounters* _eden_counters; | |
108 CSpaceCounters* _from_counters; | |
109 CSpaceCounters* _to_counters; | |
110 | |
111 // sizing information | |
112 size_t _max_eden_size; | |
113 size_t _max_survivor_size; | |
114 | |
115 // Allocation support | |
116 bool _should_allocate_from_space; | |
117 bool should_allocate_from_space() const { | |
118 return _should_allocate_from_space; | |
119 } | |
120 void clear_should_allocate_from_space() { | |
121 _should_allocate_from_space = false; | |
122 } | |
123 void set_should_allocate_from_space() { | |
124 _should_allocate_from_space = true; | |
125 } | |
126 | |
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127 // Tenuring |
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128 void adjust_desired_tenuring_threshold(); |
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129 |
0 | 130 // Spaces |
131 EdenSpace* _eden_space; | |
132 ContiguousSpace* _from_space; | |
133 ContiguousSpace* _to_space; | |
134 | |
135 enum SomeProtectedConstants { | |
136 // Generations are GenGrain-aligned and have size that are multiples of | |
137 // GenGrain. | |
138 MinFreeScratchWords = 100 | |
139 }; | |
140 | |
141 // Return the size of a survivor space if this generation were of size | |
142 // gen_size. | |
143 size_t compute_survivor_size(size_t gen_size, size_t alignment) const { | |
144 size_t n = gen_size / (SurvivorRatio + 2); | |
145 return n > alignment ? align_size_down(n, alignment) : alignment; | |
146 } | |
147 | |
148 public: // was "protected" but caused compile error on win32 | |
149 class IsAliveClosure: public BoolObjectClosure { | |
150 Generation* _g; | |
151 public: | |
152 IsAliveClosure(Generation* g); | |
153 void do_object(oop p); | |
154 bool do_object_b(oop p); | |
155 }; | |
156 | |
157 class KeepAliveClosure: public OopClosure { | |
158 protected: | |
159 ScanWeakRefClosure* _cl; | |
160 CardTableRS* _rs; | |
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161 template <class T> void do_oop_work(T* p); |
0 | 162 public: |
163 KeepAliveClosure(ScanWeakRefClosure* cl); | |
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164 virtual void do_oop(oop* p); |
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165 virtual void do_oop(narrowOop* p); |
0 | 166 }; |
167 | |
168 class FastKeepAliveClosure: public KeepAliveClosure { | |
169 protected: | |
170 HeapWord* _boundary; | |
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171 template <class T> void do_oop_work(T* p); |
0 | 172 public: |
173 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl); | |
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174 virtual void do_oop(oop* p); |
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175 virtual void do_oop(narrowOop* p); |
0 | 176 }; |
177 | |
178 class EvacuateFollowersClosure: public VoidClosure { | |
179 GenCollectedHeap* _gch; | |
180 int _level; | |
181 ScanClosure* _scan_cur_or_nonheap; | |
182 ScanClosure* _scan_older; | |
183 public: | |
184 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
185 ScanClosure* cur, ScanClosure* older); | |
186 void do_void(); | |
187 }; | |
188 | |
189 class FastEvacuateFollowersClosure: public VoidClosure { | |
190 GenCollectedHeap* _gch; | |
191 int _level; | |
192 DefNewGeneration* _gen; | |
193 FastScanClosure* _scan_cur_or_nonheap; | |
194 FastScanClosure* _scan_older; | |
195 public: | |
196 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
197 DefNewGeneration* gen, | |
198 FastScanClosure* cur, | |
199 FastScanClosure* older); | |
200 void do_void(); | |
201 }; | |
202 | |
203 public: | |
204 DefNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level, | |
205 const char* policy="Copy"); | |
206 | |
207 virtual Generation::Name kind() { return Generation::DefNew; } | |
208 | |
209 // Accessing spaces | |
210 EdenSpace* eden() const { return _eden_space; } | |
211 ContiguousSpace* from() const { return _from_space; } | |
212 ContiguousSpace* to() const { return _to_space; } | |
213 | |
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214 virtual CompactibleSpace* first_compaction_space() const; |
0 | 215 |
216 // Space enquiries | |
217 size_t capacity() const; | |
218 size_t used() const; | |
219 size_t free() const; | |
220 size_t max_capacity() const; | |
221 size_t capacity_before_gc() const; | |
222 size_t unsafe_max_alloc_nogc() const; | |
223 size_t contiguous_available() const; | |
224 | |
225 size_t max_eden_size() const { return _max_eden_size; } | |
226 size_t max_survivor_size() const { return _max_survivor_size; } | |
227 | |
228 bool supports_inline_contig_alloc() const { return true; } | |
229 HeapWord** top_addr() const; | |
230 HeapWord** end_addr() const; | |
231 | |
232 // Thread-local allocation buffers | |
233 bool supports_tlab_allocation() const { return true; } | |
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234 size_t tlab_capacity() const; |
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235 size_t unsafe_max_tlab_alloc() const; |
0 | 236 |
237 // Grow the generation by the specified number of bytes. | |
238 // The size of bytes is assumed to be properly aligned. | |
239 // Return true if the expansion was successful. | |
240 bool expand(size_t bytes); | |
241 | |
242 // DefNewGeneration cannot currently expand except at | |
243 // a GC. | |
244 virtual bool is_maximal_no_gc() const { return true; } | |
245 | |
246 // Iteration | |
247 void object_iterate(ObjectClosure* blk); | |
248 void object_iterate_since_last_GC(ObjectClosure* cl); | |
249 | |
250 void younger_refs_iterate(OopsInGenClosure* cl); | |
251 | |
252 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
253 | |
254 // Allocation support | |
255 virtual bool should_allocate(size_t word_size, bool is_tlab) { | |
256 assert(UseTLAB || !is_tlab, "Should not allocate tlab"); | |
257 | |
258 size_t overflow_limit = (size_t)1 << (BitsPerSize_t - LogHeapWordSize); | |
259 | |
260 const bool non_zero = word_size > 0; | |
261 const bool overflows = word_size >= overflow_limit; | |
262 const bool check_too_big = _pretenure_size_threshold_words > 0; | |
263 const bool not_too_big = word_size < _pretenure_size_threshold_words; | |
264 const bool size_ok = is_tlab || !check_too_big || not_too_big; | |
265 | |
266 bool result = !overflows && | |
267 non_zero && | |
268 size_ok; | |
269 | |
270 return result; | |
271 } | |
272 | |
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273 HeapWord* allocate(size_t word_size, bool is_tlab); |
0 | 274 HeapWord* allocate_from_space(size_t word_size); |
275 | |
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276 HeapWord* par_allocate(size_t word_size, bool is_tlab); |
0 | 277 |
278 // Prologue & Epilogue | |
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279 virtual void gc_prologue(bool full); |
0 | 280 virtual void gc_epilogue(bool full); |
281 | |
263
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282 // Save the tops for eden, from, and to |
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283 virtual void record_spaces_top(); |
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284 |
0 | 285 // Doesn't require additional work during GC prologue and epilogue |
286 virtual bool performs_in_place_marking() const { return false; } | |
287 | |
288 // Accessing marks | |
289 void save_marks(); | |
290 void reset_saved_marks(); | |
291 bool no_allocs_since_save_marks(); | |
292 | |
293 // Need to declare the full complement of closures, whether we'll | |
294 // override them or not, or get message from the compiler: | |
295 // oop_since_save_marks_iterate_nv hides virtual function... | |
296 #define DefNew_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
297 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
298 | |
299 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DECL) | |
300 | |
301 #undef DefNew_SINCE_SAVE_MARKS_DECL | |
302 | |
303 // For non-youngest collection, the DefNewGeneration can contribute | |
304 // "to-space". | |
263
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305 virtual void contribute_scratch(ScratchBlock*& list, Generation* requestor, |
0 | 306 size_t max_alloc_words); |
307 | |
263
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308 // Reset for contribution of "to-space". |
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309 virtual void reset_scratch(); |
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310 |
0 | 311 // GC support |
312 virtual void compute_new_size(); | |
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313 |
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314 // Returns true if the collection is likely to be safely |
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315 // completed. Even if this method returns true, a collection |
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316 // may not be guaranteed to succeed, and the system should be |
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317 // able to safely unwind and recover from that failure, albeit |
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318 // at some additional cost. Override superclass's implementation. |
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319 virtual bool collection_attempt_is_safe(); |
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320 |
0 | 321 virtual void collect(bool full, |
322 bool clear_all_soft_refs, | |
323 size_t size, | |
324 bool is_tlab); | |
325 HeapWord* expand_and_allocate(size_t size, | |
326 bool is_tlab, | |
327 bool parallel = false); | |
328 | |
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329 oop copy_to_survivor_space(oop old); |
6818 | 330 uint tenuring_threshold() { return _tenuring_threshold; } |
0 | 331 |
332 // Performance Counter support | |
333 void update_counters(); | |
334 | |
335 // Printing | |
336 virtual const char* name() const; | |
337 virtual const char* short_name() const { return "DefNew"; } | |
338 | |
339 bool must_be_youngest() const { return true; } | |
340 bool must_be_oldest() const { return false; } | |
341 | |
342 // PrintHeapAtGC support. | |
343 void print_on(outputStream* st) const; | |
344 | |
6008 | 345 void verify(); |
0 | 346 |
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347 bool promo_failure_scan_is_complete() const { |
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348 return _promo_failure_scan_stack.is_empty(); |
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349 } |
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350 |
0 | 351 protected: |
263
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352 // If clear_space is true, clear the survivor spaces. Eden is |
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353 // cleared if the minimum size of eden is 0. If mangle_space |
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354 // is true, also mangle the space in debug mode. |
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355 void compute_space_boundaries(uintx minimum_eden_size, |
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356 bool clear_space, |
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357 bool mangle_space); |
0 | 358 // Scavenge support |
359 void swap_spaces(); | |
360 }; | |
1972 | 361 |
362 #endif // SHARE_VM_MEMORY_DEFNEWGENERATION_HPP |