Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.hpp @ 6147:5ba29a1db46e hs24-b14
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author | amurillo |
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date | Fri, 15 Jun 2012 14:07:00 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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_SHAREDHEAP_HPP |
26 #define SHARE_VM_MEMORY_SHAREDHEAP_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/generation.hpp" | |
30 #include "memory/permGen.hpp" | |
31 | |
0 | 32 // A "SharedHeap" is an implementation of a java heap for HotSpot. This |
33 // is an abstract class: there may be many different kinds of heaps. This | |
34 // class defines the functions that a heap must implement, and contains | |
35 // infrastructure common to all heaps. | |
36 | |
37 class PermGen; | |
38 class Generation; | |
39 class BarrierSet; | |
40 class GenRemSet; | |
41 class Space; | |
42 class SpaceClosure; | |
43 class OopClosure; | |
44 class OopsInGenClosure; | |
45 class ObjectClosure; | |
46 class SubTasksDone; | |
47 class WorkGang; | |
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48 class FlexibleWorkGang; |
0 | 49 class CollectorPolicy; |
50 class KlassHandle; | |
51 | |
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52 // Note on use of FlexibleWorkGang's for GC. |
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53 // There are three places where task completion is determined. |
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54 // In |
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55 // 1) ParallelTaskTerminator::offer_termination() where _n_threads |
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56 // must be set to the correct value so that count of workers that |
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57 // have offered termination will exactly match the number |
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58 // working on the task. Tasks such as those derived from GCTask |
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59 // use ParallelTaskTerminator's. Tasks that want load balancing |
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60 // by work stealing use this method to gauge completion. |
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61 // 2) SubTasksDone has a variable _n_threads that is used in |
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62 // all_tasks_completed() to determine completion. all_tasks_complete() |
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63 // counts the number of tasks that have been done and then reset |
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64 // the SubTasksDone so that it can be used again. When the number of |
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65 // tasks is set to the number of GC workers, then _n_threads must |
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66 // be set to the number of active GC workers. G1CollectedHeap, |
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67 // HRInto_G1RemSet, GenCollectedHeap and SharedHeap have SubTasksDone. |
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68 // This seems too many. |
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69 // 3) SequentialSubTasksDone has an _n_threads that is used in |
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70 // a way similar to SubTasksDone and has the same dependency on the |
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71 // number of active GC workers. CompactibleFreeListSpace and Space |
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72 // have SequentialSubTasksDone's. |
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73 // Example of using SubTasksDone and SequentialSubTasksDone |
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74 // G1CollectedHeap::g1_process_strong_roots() calls |
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75 // process_strong_roots(false, // no scoping; this is parallel code |
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76 // collecting_perm_gen, so, |
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77 // &buf_scan_non_heap_roots, |
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78 // &eager_scan_code_roots, |
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79 // &buf_scan_perm); |
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80 // which delegates to SharedHeap::process_strong_roots() and uses |
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81 // SubTasksDone* _process_strong_tasks to claim tasks. |
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82 // process_strong_roots() calls |
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83 // rem_set()->younger_refs_iterate(perm_gen(), perm_blk); |
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84 // to scan the card table and which eventually calls down into |
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85 // CardTableModRefBS::par_non_clean_card_iterate_work(). This method |
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86 // uses SequentialSubTasksDone* _pst to claim tasks. |
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87 // Both SubTasksDone and SequentialSubTasksDone call their method |
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88 // all_tasks_completed() to count the number of GC workers that have |
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89 // finished their work. That logic is "when all the workers are |
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90 // finished the tasks are finished". |
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91 // |
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92 // The pattern that appears in the code is to set _n_threads |
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93 // to a value > 1 before a task that you would like executed in parallel |
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94 // and then to set it to 0 after that task has completed. A value of |
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95 // 0 is a "special" value in set_n_threads() which translates to |
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96 // setting _n_threads to 1. |
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97 // |
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98 // Some code uses _n_terminiation to decide if work should be done in |
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99 // parallel. The notorious possibly_parallel_oops_do() in threads.cpp |
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100 // is an example of such code. Look for variable "is_par" for other |
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101 // examples. |
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102 // |
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103 // The active_workers is not reset to 0 after a parallel phase. It's |
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104 // value may be used in later phases and in one instance at least |
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105 // (the parallel remark) it has to be used (the parallel remark depends |
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106 // on the partitioning done in the previous parallel scavenge). |
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107 |
0 | 108 class SharedHeap : public CollectedHeap { |
109 friend class VMStructs; | |
110 | |
342 | 111 friend class VM_GC_Operation; |
112 friend class VM_CGC_Operation; | |
113 | |
0 | 114 private: |
115 // For claiming strong_roots tasks. | |
116 SubTasksDone* _process_strong_tasks; | |
117 | |
118 protected: | |
119 // There should be only a single instance of "SharedHeap" in a program. | |
120 // This is enforced with the protected constructor below, which will also | |
121 // set the static pointer "_sh" to that instance. | |
122 static SharedHeap* _sh; | |
123 | |
124 // All heaps contain a "permanent generation." This is some ways | |
125 // similar to a generation in a generational system, in other ways not. | |
126 // See the "PermGen" class. | |
127 PermGen* _perm_gen; | |
128 | |
129 // and the Gen Remembered Set, at least one good enough to scan the perm | |
130 // gen. | |
131 GenRemSet* _rem_set; | |
132 | |
133 // A gc policy, controls global gc resource issues | |
134 CollectorPolicy *_collector_policy; | |
135 | |
136 // See the discussion below, in the specification of the reader function | |
137 // for this variable. | |
138 int _strong_roots_parity; | |
139 | |
140 // If we're doing parallel GC, use this gang of threads. | |
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141 FlexibleWorkGang* _workers; |
0 | 142 |
143 // Full initialization is done in a concrete subtype's "initialize" | |
144 // function. | |
145 SharedHeap(CollectorPolicy* policy_); | |
146 | |
342 | 147 // Returns true if the calling thread holds the heap lock, |
148 // or the calling thread is a par gc thread and the heap_lock is held | |
149 // by the vm thread doing a gc operation. | |
150 bool heap_lock_held_for_gc(); | |
151 // True if the heap_lock is held by the a non-gc thread invoking a gc | |
152 // operation. | |
153 bool _thread_holds_heap_lock_for_gc; | |
154 | |
0 | 155 public: |
156 static SharedHeap* heap() { return _sh; } | |
157 | |
158 CollectorPolicy *collector_policy() const { return _collector_policy; } | |
159 | |
160 void set_barrier_set(BarrierSet* bs); | |
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161 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
0 | 162 |
163 // Does operations required after initialization has been done. | |
164 virtual void post_initialize(); | |
165 | |
166 // Initialization of ("weak") reference processing support | |
167 virtual void ref_processing_init(); | |
168 | |
169 void set_perm(PermGen* perm_gen) { _perm_gen = perm_gen; } | |
170 | |
171 // This function returns the "GenRemSet" object that allows us to scan | |
172 // generations; at least the perm gen, possibly more in a fully | |
173 // generational heap. | |
174 GenRemSet* rem_set() { return _rem_set; } | |
175 | |
176 // These function return the "permanent" generation, in which | |
177 // reflective objects are allocated and stored. Two versions, the second | |
178 // of which returns the view of the perm gen as a generation. | |
179 PermGen* perm() const { return _perm_gen; } | |
180 Generation* perm_gen() const { return _perm_gen->as_gen(); } | |
181 | |
182 // Iteration functions. | |
183 void oop_iterate(OopClosure* cl) = 0; | |
184 | |
185 // Same as above, restricted to a memory region. | |
186 virtual void oop_iterate(MemRegion mr, OopClosure* cl) = 0; | |
187 | |
188 // Iterate over all objects allocated since the last collection, calling | |
189 // "cl->do_object" on each. The heap must have been initialized properly | |
190 // to support this function, or else this call will fail. | |
191 virtual void object_iterate_since_last_GC(ObjectClosure* cl) = 0; | |
192 | |
193 // Iterate over all spaces in use in the heap, in an undefined order. | |
194 virtual void space_iterate(SpaceClosure* cl) = 0; | |
195 | |
196 // A SharedHeap will contain some number of spaces. This finds the | |
197 // space whose reserved area contains the given address, or else returns | |
198 // NULL. | |
199 virtual Space* space_containing(const void* addr) const = 0; | |
200 | |
201 bool no_gc_in_progress() { return !is_gc_active(); } | |
202 | |
203 // Some collectors will perform "process_strong_roots" in parallel. | |
204 // Such a call will involve claiming some fine-grained tasks, such as | |
205 // scanning of threads. To make this process simpler, we provide the | |
206 // "strong_roots_parity()" method. Collectors that start parallel tasks | |
207 // whose threads invoke "process_strong_roots" must | |
208 // call "change_strong_roots_parity" in sequential code starting such a | |
209 // task. (This also means that a parallel thread may only call | |
210 // process_strong_roots once.) | |
211 // | |
212 // For calls to process_strong_roots by sequential code, the parity is | |
213 // updated automatically. | |
214 // | |
215 // The idea is that objects representing fine-grained tasks, such as | |
216 // threads, will contain a "parity" field. A task will is claimed in the | |
217 // current "process_strong_roots" call only if its parity field is the | |
218 // same as the "strong_roots_parity"; task claiming is accomplished by | |
219 // updating the parity field to the strong_roots_parity with a CAS. | |
220 // | |
221 // If the client meats this spec, then strong_roots_parity() will have | |
222 // the following properties: | |
223 // a) to return a different value than was returned before the last | |
224 // call to change_strong_roots_parity, and | |
225 // c) to never return a distinguished value (zero) with which such | |
226 // task-claiming variables may be initialized, to indicate "never | |
227 // claimed". | |
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228 private: |
0 | 229 void change_strong_roots_parity(); |
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230 public: |
0 | 231 int strong_roots_parity() { return _strong_roots_parity; } |
232 | |
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233 // Call these in sequential code around process_strong_roots. |
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234 // strong_roots_prologue calls change_strong_roots_parity, if |
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235 // parallel tasks are enabled. |
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236 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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237 public: |
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238 StrongRootsScope(SharedHeap* outer, bool activate = true); |
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239 ~StrongRootsScope(); |
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240 }; |
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241 friend class StrongRootsScope; |
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242 |
0 | 243 enum ScanningOption { |
244 SO_None = 0x0, | |
245 SO_AllClasses = 0x1, | |
246 SO_SystemClasses = 0x2, | |
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247 SO_Strings = 0x4, |
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248 SO_CodeCache = 0x8 |
0 | 249 }; |
250 | |
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251 FlexibleWorkGang* workers() const { return _workers; } |
0 | 252 |
253 // Invoke the "do_oop" method the closure "roots" on all root locations. | |
254 // If "collecting_perm_gen" is false, then roots that may only contain | |
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255 // references to permGen objects are not scanned; instead, in that case, |
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256 // the "perm_blk" closure is applied to all outgoing refs in the |
0 | 257 // permanent generation. The "so" argument determines which of roots |
258 // the closure is applied to: | |
259 // "SO_None" does none; | |
260 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
261 // "SO_SystemClasses" to all the "system" classes and loaders; | |
262 // "SO_Strings" applies the closure to all entries in StringTable; | |
263 // "SO_CodeCache" applies the closure to all elements of the CodeCache. | |
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264 void process_strong_roots(bool activate_scope, |
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265 bool collecting_perm_gen, |
0 | 266 ScanningOption so, |
267 OopClosure* roots, | |
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268 CodeBlobClosure* code_roots, |
0 | 269 OopsInGenClosure* perm_blk); |
270 | |
271 // Apply "blk" to all the weak roots of the system. These include | |
272 // JNI weak roots, the code cache, system dictionary, symbol table, | |
273 // string table. | |
274 void process_weak_roots(OopClosure* root_closure, | |
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275 CodeBlobClosure* code_roots, |
0 | 276 OopClosure* non_root_closure); |
277 | |
278 // The functions below are helper functions that a subclass of | |
279 // "SharedHeap" can use in the implementation of its virtual | |
280 // functions. | |
281 | |
342 | 282 public: |
0 | 283 |
284 // Do anything common to GC's. | |
285 virtual void gc_prologue(bool full) = 0; | |
286 virtual void gc_epilogue(bool full) = 0; | |
287 | |
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288 // Sets the number of parallel threads that will be doing tasks |
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289 // (such as process strong roots) subsequently. |
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290 virtual void set_par_threads(uint t); |
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291 |
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292 int n_termination(); |
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293 void set_n_termination(int t); |
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294 |
0 | 295 // |
296 // New methods from CollectedHeap | |
297 // | |
298 | |
299 size_t permanent_capacity() const { | |
300 assert(perm_gen(), "NULL perm gen"); | |
301 return perm_gen()->capacity(); | |
302 } | |
303 | |
304 size_t permanent_used() const { | |
305 assert(perm_gen(), "NULL perm gen"); | |
306 return perm_gen()->used(); | |
307 } | |
308 | |
309 bool is_in_permanent(const void *p) const { | |
310 assert(perm_gen(), "NULL perm gen"); | |
311 return perm_gen()->is_in_reserved(p); | |
312 } | |
313 | |
314 // Different from is_in_permanent in that is_in_permanent | |
315 // only checks if p is in the reserved area of the heap | |
316 // and this checks to see if it in the commited area. | |
317 // This is typically used by things like the forte stackwalker | |
318 // during verification of suspicious frame values. | |
319 bool is_permanent(const void *p) const { | |
320 assert(perm_gen(), "NULL perm gen"); | |
321 return perm_gen()->is_in(p); | |
322 } | |
323 | |
324 HeapWord* permanent_mem_allocate(size_t size) { | |
325 assert(perm_gen(), "NULL perm gen"); | |
326 return _perm_gen->mem_allocate(size); | |
327 } | |
328 | |
329 void permanent_oop_iterate(OopClosure* cl) { | |
330 assert(perm_gen(), "NULL perm gen"); | |
331 _perm_gen->oop_iterate(cl); | |
332 } | |
333 | |
334 void permanent_object_iterate(ObjectClosure* cl) { | |
335 assert(perm_gen(), "NULL perm gen"); | |
336 _perm_gen->object_iterate(cl); | |
337 } | |
338 | |
339 // Some utilities. | |
342 | 340 void print_size_transition(outputStream* out, |
341 size_t bytes_before, | |
0 | 342 size_t bytes_after, |
343 size_t capacity); | |
344 }; | |
1972 | 345 |
346 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP |