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annotate src/share/vm/memory/defNewGeneration.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | a7214d79fcf1 |
| children | 74ee0db180fa |
| rev | line source |
|---|---|
| 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 | |
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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". | |
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302 virtual void contribute_scratch(ScratchBlock*& list, Generation* requestor, |
| 0 | 303 size_t max_alloc_words); |
| 304 | |
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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: |
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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 |