Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.hpp @ 1042:4926bf2d292f
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date | Thu, 29 Oct 2009 08:49:31 -0700 |
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0 | 1 /* |
579 | 2 * Copyright 2000-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class SubTasksDone; | |
26 | |
27 // A "GenCollectedHeap" is a SharedHeap that uses generational | |
28 // collection. It is represented with a sequence of Generation's. | |
29 class GenCollectedHeap : public SharedHeap { | |
30 friend class GenCollectorPolicy; | |
31 friend class Generation; | |
32 friend class DefNewGeneration; | |
33 friend class TenuredGeneration; | |
34 friend class ConcurrentMarkSweepGeneration; | |
35 friend class CMSCollector; | |
36 friend class GenMarkSweep; | |
37 friend class VM_GenCollectForAllocation; | |
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38 friend class VM_GenCollectForPermanentAllocation; |
0 | 39 friend class VM_GenCollectFull; |
40 friend class VM_GenCollectFullConcurrent; | |
41 friend class VM_GC_HeapInspection; | |
42 friend class VM_HeapDumper; | |
43 friend class HeapInspection; | |
44 friend class GCCauseSetter; | |
45 friend class VMStructs; | |
46 public: | |
47 enum SomeConstants { | |
48 max_gens = 10 | |
49 }; | |
50 | |
51 friend class VM_PopulateDumpSharedSpace; | |
52 | |
53 protected: | |
54 // Fields: | |
55 static GenCollectedHeap* _gch; | |
56 | |
57 private: | |
58 int _n_gens; | |
59 Generation* _gens[max_gens]; | |
60 GenerationSpec** _gen_specs; | |
61 | |
62 // The generational collector policy. | |
63 GenCollectorPolicy* _gen_policy; | |
64 | |
65 // If a generation would bail out of an incremental collection, | |
66 // it sets this flag. If the flag is set, satisfy_failed_allocation | |
67 // will attempt allocating in all generations before doing a full GC. | |
68 bool _incremental_collection_will_fail; | |
69 bool _last_incremental_collection_failed; | |
70 | |
71 // In support of ExplicitGCInvokesConcurrent functionality | |
72 unsigned int _full_collections_completed; | |
73 | |
74 // Data structure for claiming the (potentially) parallel tasks in | |
75 // (gen-specific) strong roots processing. | |
76 SubTasksDone* _gen_process_strong_tasks; | |
77 | |
78 // In block contents verification, the number of header words to skip | |
79 NOT_PRODUCT(static size_t _skip_header_HeapWords;) | |
80 | |
81 // GC is not allowed during the dump of the shared classes. Keep track | |
82 // of this in order to provide an reasonable error message when terminating. | |
83 bool _preloading_shared_classes; | |
84 | |
85 protected: | |
86 // Directs each generation up to and including "collectedGen" to recompute | |
87 // its desired size. | |
88 void compute_new_generation_sizes(int collectedGen); | |
89 | |
90 // Helper functions for allocation | |
91 HeapWord* attempt_allocation(size_t size, | |
92 bool is_tlab, | |
93 bool first_only); | |
94 | |
95 // Helper function for two callbacks below. | |
96 // Considers collection of the first max_level+1 generations. | |
97 void do_collection(bool full, | |
98 bool clear_all_soft_refs, | |
99 size_t size, | |
100 bool is_tlab, | |
101 int max_level); | |
102 | |
103 // Callback from VM_GenCollectForAllocation operation. | |
104 // This function does everything necessary/possible to satisfy an | |
105 // allocation request that failed in the youngest generation that should | |
106 // have handled it (including collection, expansion, etc.) | |
107 HeapWord* satisfy_failed_allocation(size_t size, bool is_tlab); | |
108 | |
109 // Callback from VM_GenCollectFull operation. | |
110 // Perform a full collection of the first max_level+1 generations. | |
111 void do_full_collection(bool clear_all_soft_refs, int max_level); | |
112 | |
113 // Does the "cause" of GC indicate that | |
114 // we absolutely __must__ clear soft refs? | |
115 bool must_clear_all_soft_refs(); | |
116 | |
117 public: | |
118 GenCollectedHeap(GenCollectorPolicy *policy); | |
119 | |
120 GCStats* gc_stats(int level) const; | |
121 | |
122 // Returns JNI_OK on success | |
123 virtual jint initialize(); | |
124 char* allocate(size_t alignment, PermanentGenerationSpec* perm_gen_spec, | |
125 size_t* _total_reserved, int* _n_covered_regions, | |
126 ReservedSpace* heap_rs); | |
127 | |
128 // Does operations required after initialization has been done. | |
129 void post_initialize(); | |
130 | |
131 // Initialize ("weak") refs processing support | |
132 virtual void ref_processing_init(); | |
133 | |
134 virtual CollectedHeap::Name kind() const { | |
135 return CollectedHeap::GenCollectedHeap; | |
136 } | |
137 | |
138 // The generational collector policy. | |
139 GenCollectorPolicy* gen_policy() const { return _gen_policy; } | |
140 | |
141 // Adaptive size policy | |
142 virtual AdaptiveSizePolicy* size_policy() { | |
143 return gen_policy()->size_policy(); | |
144 } | |
145 | |
146 size_t capacity() const; | |
147 size_t used() const; | |
148 | |
149 // Save the "used_region" for generations level and lower, | |
150 // and, if perm is true, for perm gen. | |
151 void save_used_regions(int level, bool perm); | |
152 | |
153 size_t max_capacity() const; | |
154 | |
155 HeapWord* mem_allocate(size_t size, | |
156 bool is_large_noref, | |
157 bool is_tlab, | |
158 bool* gc_overhead_limit_was_exceeded); | |
159 | |
160 // We may support a shared contiguous allocation area, if the youngest | |
161 // generation does. | |
162 bool supports_inline_contig_alloc() const; | |
163 HeapWord** top_addr() const; | |
164 HeapWord** end_addr() const; | |
165 | |
166 // Return an estimate of the maximum allocation that could be performed | |
167 // without triggering any collection activity. In a generational | |
168 // collector, for example, this is probably the largest allocation that | |
169 // could be supported in the youngest generation. It is "unsafe" because | |
170 // no locks are taken; the result should be treated as an approximation, | |
171 // not a guarantee. | |
172 size_t unsafe_max_alloc(); | |
173 | |
174 // Does this heap support heap inspection? (+PrintClassHistogram) | |
175 virtual bool supports_heap_inspection() const { return true; } | |
176 | |
177 // Perform a full collection of the heap; intended for use in implementing | |
178 // "System.gc". This implies as full a collection as the CollectedHeap | |
179 // supports. Caller does not hold the Heap_lock on entry. | |
180 void collect(GCCause::Cause cause); | |
181 | |
182 // This interface assumes that it's being called by the | |
183 // vm thread. It collects the heap assuming that the | |
184 // heap lock is already held and that we are executing in | |
185 // the context of the vm thread. | |
186 void collect_as_vm_thread(GCCause::Cause cause); | |
187 | |
188 // The same as above but assume that the caller holds the Heap_lock. | |
189 void collect_locked(GCCause::Cause cause); | |
190 | |
191 // Perform a full collection of the first max_level+1 generations. | |
192 // Mostly used for testing purposes. Caller does not hold the Heap_lock on entry. | |
193 void collect(GCCause::Cause cause, int max_level); | |
194 | |
195 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
196 // The methods is_in(), is_in_closed_subset() and is_in_youngest() may | |
197 // be expensive to compute in general, so, to prevent | |
198 // their inadvertent use in product jvm's, we restrict their use to | |
199 // assertion checking or verification only. | |
200 bool is_in(const void* p) const; | |
201 | |
202 // override | |
203 bool is_in_closed_subset(const void* p) const { | |
204 if (UseConcMarkSweepGC) { | |
205 return is_in_reserved(p); | |
206 } else { | |
207 return is_in(p); | |
208 } | |
209 } | |
210 | |
211 // Returns "TRUE" iff "p" points into the youngest generation. | |
212 bool is_in_youngest(void* p); | |
213 | |
214 // Iteration functions. | |
215 void oop_iterate(OopClosure* cl); | |
216 void oop_iterate(MemRegion mr, OopClosure* cl); | |
217 void object_iterate(ObjectClosure* cl); | |
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218 void safe_object_iterate(ObjectClosure* cl); |
0 | 219 void object_iterate_since_last_GC(ObjectClosure* cl); |
220 Space* space_containing(const void* addr) const; | |
221 | |
222 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
223 // each address in the (reserved) heap is a member of exactly | |
224 // one block. The defining characteristic of a block is that it is | |
225 // possible to find its size, and thus to progress forward to the next | |
226 // block. (Blocks may be of different sizes.) Thus, blocks may | |
227 // represent Java objects, or they might be free blocks in a | |
228 // free-list-based heap (or subheap), as long as the two kinds are | |
229 // distinguishable and the size of each is determinable. | |
230 | |
231 // Returns the address of the start of the "block" that contains the | |
232 // address "addr". We say "blocks" instead of "object" since some heaps | |
233 // may not pack objects densely; a chunk may either be an object or a | |
234 // non-object. | |
235 virtual HeapWord* block_start(const void* addr) const; | |
236 | |
237 // Requires "addr" to be the start of a chunk, and returns its size. | |
238 // "addr + size" is required to be the start of a new chunk, or the end | |
239 // of the active area of the heap. Assumes (and verifies in non-product | |
240 // builds) that addr is in the allocated part of the heap and is | |
241 // the start of a chunk. | |
242 virtual size_t block_size(const HeapWord* addr) const; | |
243 | |
244 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
245 // the block is an object. Assumes (and verifies in non-product | |
246 // builds) that addr is in the allocated part of the heap and is | |
247 // the start of a chunk. | |
248 virtual bool block_is_obj(const HeapWord* addr) const; | |
249 | |
250 // Section on TLAB's. | |
251 virtual bool supports_tlab_allocation() const; | |
252 virtual size_t tlab_capacity(Thread* thr) const; | |
253 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
254 virtual HeapWord* allocate_new_tlab(size_t size); | |
255 | |
342
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256 // Can a compiler initialize a new object without store barriers? |
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257 // This permission only extends from the creation of a new object |
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258 // via a TLAB up to the first subsequent safepoint. |
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259 virtual bool can_elide_tlab_store_barriers() const { |
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260 return true; |
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261 } |
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262 |
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263 // We don't need barriers for stores to objects in the |
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264 // young gen and, a fortiori, for initializing stores to |
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265 // objects therein. This applies to {DefNew,ParNew}+{Tenured,CMS} |
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266 // only and may need to be re-examined in case other |
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267 // kinds of collectors are implemented in the future. |
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268 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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269 // We wanted to assert that:- |
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270 // assert(UseParNewGC || UseSerialGC || UseConcMarkSweepGC, |
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271 // "Check can_elide_initializing_store_barrier() for this collector"); |
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272 // but unfortunately the flag UseSerialGC need not necessarily always |
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273 // be set when DefNew+Tenured are being used. |
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274 return is_in_youngest((void*)new_obj); |
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275 } |
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276 |
342
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277 // Can a compiler elide a store barrier when it writes |
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278 // a permanent oop into the heap? Applies when the compiler |
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279 // is storing x to the heap, where x->is_perm() is true. |
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280 virtual bool can_elide_permanent_oop_store_barriers() const { |
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281 // CMS needs to see all, even intra-generational, ref updates. |
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282 return !UseConcMarkSweepGC; |
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283 } |
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284 |
0 | 285 // The "requestor" generation is performing some garbage collection |
286 // action for which it would be useful to have scratch space. The | |
287 // requestor promises to allocate no more than "max_alloc_words" in any | |
288 // older generation (via promotion say.) Any blocks of space that can | |
289 // be provided are returned as a list of ScratchBlocks, sorted by | |
290 // decreasing size. | |
291 ScratchBlock* gather_scratch(Generation* requestor, size_t max_alloc_words); | |
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292 // Allow each generation to reset any scratch space that it has |
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293 // contributed as it needs. |
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294 void release_scratch(); |
0 | 295 |
296 size_t large_typearray_limit(); | |
297 | |
298 // Ensure parsability: override | |
299 virtual void ensure_parsability(bool retire_tlabs); | |
300 | |
301 // Time in ms since the longest time a collector ran in | |
302 // in any generation. | |
303 virtual jlong millis_since_last_gc(); | |
304 | |
305 // Total number of full collections completed. | |
306 unsigned int total_full_collections_completed() { | |
307 assert(_full_collections_completed <= _total_full_collections, | |
308 "Can't complete more collections than were started"); | |
309 return _full_collections_completed; | |
310 } | |
311 | |
312 // Update above counter, as appropriate, at the end of a stop-world GC cycle | |
313 unsigned int update_full_collections_completed(); | |
314 // Update above counter, as appropriate, at the end of a concurrent GC cycle | |
315 unsigned int update_full_collections_completed(unsigned int count); | |
316 | |
317 // Update "time of last gc" for all constituent generations | |
318 // to "now". | |
319 void update_time_of_last_gc(jlong now) { | |
320 for (int i = 0; i < _n_gens; i++) { | |
321 _gens[i]->update_time_of_last_gc(now); | |
322 } | |
323 perm_gen()->update_time_of_last_gc(now); | |
324 } | |
325 | |
326 // Update the gc statistics for each generation. | |
327 // "level" is the level of the lastest collection | |
328 void update_gc_stats(int current_level, bool full) { | |
329 for (int i = 0; i < _n_gens; i++) { | |
330 _gens[i]->update_gc_stats(current_level, full); | |
331 } | |
332 perm_gen()->update_gc_stats(current_level, full); | |
333 } | |
334 | |
335 // Override. | |
336 bool no_gc_in_progress() { return !is_gc_active(); } | |
337 | |
338 // Override. | |
339 void prepare_for_verify(); | |
340 | |
341 // Override. | |
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342 void verify(bool allow_dirty, bool silent, bool /* option */); |
0 | 343 |
344 // Override. | |
345 void print() const; | |
346 void print_on(outputStream* st) const; | |
347 virtual void print_gc_threads_on(outputStream* st) const; | |
348 virtual void gc_threads_do(ThreadClosure* tc) const; | |
349 virtual void print_tracing_info() const; | |
350 | |
351 // PrintGC, PrintGCDetails support | |
352 void print_heap_change(size_t prev_used) const; | |
353 void print_perm_heap_change(size_t perm_prev_used) const; | |
354 | |
355 // The functions below are helper functions that a subclass of | |
356 // "CollectedHeap" can use in the implementation of its virtual | |
357 // functions. | |
358 | |
359 class GenClosure : public StackObj { | |
360 public: | |
361 virtual void do_generation(Generation* gen) = 0; | |
362 }; | |
363 | |
364 // Apply "cl.do_generation" to all generations in the heap (not including | |
365 // the permanent generation). If "old_to_young" determines the order. | |
366 void generation_iterate(GenClosure* cl, bool old_to_young); | |
367 | |
368 void space_iterate(SpaceClosure* cl); | |
369 | |
370 // Return "true" if all generations (but perm) have reached the | |
371 // maximal committed limit that they can reach, without a garbage | |
372 // collection. | |
373 virtual bool is_maximal_no_gc() const; | |
374 | |
375 // Return the generation before "gen", or else NULL. | |
376 Generation* prev_gen(Generation* gen) const { | |
377 int l = gen->level(); | |
378 if (l == 0) return NULL; | |
379 else return _gens[l-1]; | |
380 } | |
381 | |
382 // Return the generation after "gen", or else NULL. | |
383 Generation* next_gen(Generation* gen) const { | |
384 int l = gen->level() + 1; | |
385 if (l == _n_gens) return NULL; | |
386 else return _gens[l]; | |
387 } | |
388 | |
389 Generation* get_gen(int i) const { | |
390 if (i >= 0 && i < _n_gens) | |
391 return _gens[i]; | |
392 else | |
393 return NULL; | |
394 } | |
395 | |
396 int n_gens() const { | |
397 assert(_n_gens == gen_policy()->number_of_generations(), "Sanity"); | |
398 return _n_gens; | |
399 } | |
400 | |
401 // Convenience function to be used in situations where the heap type can be | |
402 // asserted to be this type. | |
403 static GenCollectedHeap* heap(); | |
404 | |
405 void set_par_threads(int t); | |
406 | |
407 | |
408 // Invoke the "do_oop" method of one of the closures "not_older_gens" | |
409 // or "older_gens" on root locations for the generation at | |
410 // "level". (The "older_gens" closure is used for scanning references | |
411 // from older generations; "not_older_gens" is used everywhere else.) | |
412 // If "younger_gens_as_roots" is false, younger generations are | |
413 // not scanned as roots; in this case, the caller must be arranging to | |
414 // scan the younger generations itself. (For example, a generation might | |
415 // explicitly mark reachable objects in younger generations, to avoid | |
416 // excess storage retention.) If "collecting_perm_gen" is false, then | |
417 // roots that may only contain references to permGen objects are not | |
418 // scanned. The "so" argument determines which of the roots | |
419 // the closure is applied to: | |
420 // "SO_None" does none; | |
421 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
422 // "SO_SystemClasses" to all the "system" classes and loaders; | |
423 // "SO_Symbols_and_Strings" applies the closure to all entries in | |
424 // SymbolsTable and StringTable. | |
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425 void gen_process_strong_roots(int level, |
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426 bool younger_gens_as_roots, |
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427 // The remaining arguments are in an order |
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428 // consistent with SharedHeap::process_strong_roots: |
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429 bool activate_scope, |
0 | 430 bool collecting_perm_gen, |
431 SharedHeap::ScanningOption so, | |
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432 OopsInGenClosure* not_older_gens, |
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433 bool do_code_roots, |
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434 OopsInGenClosure* older_gens); |
0 | 435 |
436 // Apply "blk" to all the weak roots of the system. These include | |
437 // JNI weak roots, the code cache, system dictionary, symbol table, | |
438 // string table, and referents of reachable weak refs. | |
439 void gen_process_weak_roots(OopClosure* root_closure, | |
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440 CodeBlobClosure* code_roots, |
0 | 441 OopClosure* non_root_closure); |
442 | |
443 // Set the saved marks of generations, if that makes sense. | |
444 // In particular, if any generation might iterate over the oops | |
445 // in other generations, it should call this method. | |
446 void save_marks(); | |
447 | |
448 // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects | |
449 // allocated since the last call to save_marks in generations at or above | |
450 // "level" (including the permanent generation.) The "cur" closure is | |
451 // applied to references in the generation at "level", and the "older" | |
452 // closure to older (and permanent) generations. | |
453 #define GCH_SINCE_SAVE_MARKS_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
454 void oop_since_save_marks_iterate(int level, \ | |
455 OopClosureType* cur, \ | |
456 OopClosureType* older); | |
457 | |
458 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DECL) | |
459 | |
460 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DECL | |
461 | |
462 // Returns "true" iff no allocations have occurred in any generation at | |
463 // "level" or above (including the permanent generation) since the last | |
464 // call to "save_marks". | |
465 bool no_allocs_since_save_marks(int level); | |
466 | |
467 // If a generation bails out of an incremental collection, | |
468 // it sets this flag. | |
469 bool incremental_collection_will_fail() { | |
470 return _incremental_collection_will_fail; | |
471 } | |
472 void set_incremental_collection_will_fail() { | |
473 _incremental_collection_will_fail = true; | |
474 } | |
475 void clear_incremental_collection_will_fail() { | |
476 _incremental_collection_will_fail = false; | |
477 } | |
478 | |
479 bool last_incremental_collection_failed() const { | |
480 return _last_incremental_collection_failed; | |
481 } | |
482 void set_last_incremental_collection_failed() { | |
483 _last_incremental_collection_failed = true; | |
484 } | |
485 void clear_last_incremental_collection_failed() { | |
486 _last_incremental_collection_failed = false; | |
487 } | |
488 | |
489 // Promotion of obj into gen failed. Try to promote obj to higher non-perm | |
490 // gens in ascending order; return the new location of obj if successful. | |
491 // Otherwise, try expand-and-allocate for obj in each generation starting at | |
492 // gen; return the new location of obj if successful. Otherwise, return NULL. | |
493 oop handle_failed_promotion(Generation* gen, | |
494 oop obj, | |
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495 size_t obj_size); |
0 | 496 |
497 private: | |
498 // Accessor for memory state verification support | |
499 NOT_PRODUCT( | |
500 static size_t skip_header_HeapWords() { return _skip_header_HeapWords; } | |
501 ) | |
502 | |
503 // Override | |
504 void check_for_non_bad_heap_word_value(HeapWord* addr, | |
505 size_t size) PRODUCT_RETURN; | |
506 | |
507 // For use by mark-sweep. As implemented, mark-sweep-compact is global | |
508 // in an essential way: compaction is performed across generations, by | |
509 // iterating over spaces. | |
510 void prepare_for_compaction(); | |
511 | |
512 // Perform a full collection of the first max_level+1 generations. | |
513 // This is the low level interface used by the public versions of | |
514 // collect() and collect_locked(). Caller holds the Heap_lock on entry. | |
515 void collect_locked(GCCause::Cause cause, int max_level); | |
516 | |
517 // Returns success or failure. | |
518 bool create_cms_collector(); | |
519 | |
520 // In support of ExplicitGCInvokesConcurrent functionality | |
521 bool should_do_concurrent_full_gc(GCCause::Cause cause); | |
522 void collect_mostly_concurrent(GCCause::Cause cause); | |
523 | |
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524 // Save the tops of the spaces in all generations |
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525 void record_gen_tops_before_GC() PRODUCT_RETURN; |
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526 |
0 | 527 protected: |
528 virtual void gc_prologue(bool full); | |
529 virtual void gc_epilogue(bool full); | |
530 | |
531 public: | |
532 virtual void preload_and_dump(TRAPS) KERNEL_RETURN; | |
533 }; |