Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 2951:0c0e407faa39
another fix to debug info (on-stack parameters), DCE removes unnecessary merges and LoopBegins whose LoopEnd went away
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 14 Jun 2011 16:47:31 +0200 |
parents | f95d63e2154a |
children | e8b0b0392037 |
rev | line source |
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342 | 1 /* |
1705 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP | |
27 | |
342 | 28 // A G1RemSet provides ways of iterating over pointers into a selected |
29 // collection set. | |
30 | |
31 class G1CollectedHeap; | |
32 class CardTableModRefBarrierSet; | |
33 class ConcurrentG1Refine; | |
34 | |
1861 | 35 // A G1RemSet in which each heap region has a rem set that records the |
36 // external heap references into it. Uses a mod ref bs to track updates, | |
37 // so that they can be used to update the individual region remsets. | |
38 | |
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39 class G1RemSet: public CHeapObj { |
342 | 40 protected: |
41 G1CollectedHeap* _g1; | |
42 unsigned _conc_refine_cards; | |
43 size_t n_workers(); | |
44 | |
45 protected: | |
46 enum SomePrivateConstants { | |
47 UpdateRStoMergeSync = 0, | |
48 MergeRStoDoDirtySync = 1, | |
49 DoDirtySync = 2, | |
50 LastSync = 3, | |
51 | |
52 SeqTask = 0, | |
53 NumSeqTasks = 1 | |
54 }; | |
55 | |
56 CardTableModRefBS* _ct_bs; | |
57 SubTasksDone* _seq_task; | |
58 G1CollectorPolicy* _g1p; | |
59 | |
60 ConcurrentG1Refine* _cg1r; | |
61 | |
62 size_t* _cards_scanned; | |
63 size_t _total_cards_scanned; | |
64 | |
1705 | 65 // Used for caching the closure that is responsible for scanning |
66 // references into the collection set. | |
67 OopsInHeapRegionClosure** _cset_rs_update_cl; | |
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68 |
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69 // The routine that performs the actual work of refining a dirty |
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70 // card. |
1705 | 71 // If check_for_refs_into_refs is true then a true result is returned |
72 // if the card contains oops that have references into the current | |
73 // collection set. | |
74 bool concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, | |
75 bool check_for_refs_into_cset); | |
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76 |
342 | 77 public: |
78 // This is called to reset dual hash tables after the gc pause | |
79 // is finished and the initial hash table is no longer being | |
80 // scanned. | |
81 void cleanupHRRS(); | |
82 | |
1861 | 83 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); |
84 ~G1RemSet(); | |
342 | 85 |
1861 | 86 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions |
87 // outside the CS (having invoked "blk->set_region" to set the "from" | |
88 // region correctly beforehand.) The "worker_i" param is for the | |
89 // parallel case where the number of the worker thread calling this | |
90 // function can be helpful in partitioning the work to be done. It | |
91 // should be the same as the "i" passed to the calling thread's | |
92 // work(i) function. In the sequential case this param will be ingored. | |
342 | 93 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, |
94 int worker_i); | |
95 | |
1861 | 96 // Prepare for and cleanup after an oops_into_collection_set_do |
97 // call. Must call each of these once before and after (in sequential | |
98 // code) any threads call oops_into_collection_set_do. (This offers an | |
99 // opportunity to sequential setup and teardown of structures needed by a | |
100 // parallel iteration over the CS's RS.) | |
342 | 101 void prepare_for_oops_into_collection_set_do(); |
102 void cleanup_after_oops_into_collection_set_do(); | |
1861 | 103 |
342 | 104 void scanRS(OopsInHeapRegionClosure* oc, int worker_i); |
1705 | 105 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i); |
1861 | 106 |
342 | 107 HeapRegion* calculateStartRegion(int i); |
108 | |
109 CardTableModRefBS* ct_bs() { return _ct_bs; } | |
110 size_t cardsScanned() { return _total_cards_scanned; } | |
111 | |
112 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
113 // which is required to be non-NULL) has changed to a new non-NULL value. | |
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114 template <class T> void write_ref(HeapRegion* from, T* p); |
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115 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
342 | 116 |
1861 | 117 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
118 // or card, respectively, such that a region or card with a corresponding | |
119 // 0 bit contains no part of any live object. Eliminates any remembered | |
120 // set entries that correspond to dead heap ranges. | |
342 | 121 void scrub(BitMap* region_bm, BitMap* card_bm); |
1861 | 122 |
123 // Like the above, but assumes is called in parallel: "worker_num" is the | |
124 // parallel thread id of the current thread, and "claim_val" is the | |
125 // value that should be used to claim heap regions. | |
342 | 126 void scrub_par(BitMap* region_bm, BitMap* card_bm, |
127 int worker_num, int claim_val); | |
128 | |
1861 | 129 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL, |
130 // join and leave around parts that must be atomic wrt GC. (NULL means | |
131 // being done at a safepoint.) | |
132 // If check_for_refs_into_cset is true, a true result is returned | |
133 // if the given card contains oops that have references into the | |
134 // current collection set. | |
1705 | 135 virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
136 bool check_for_refs_into_cset); | |
342 | 137 |
1861 | 138 // Print any relevant summary info. |
342 | 139 virtual void print_summary_info(); |
1861 | 140 |
141 // Prepare remembered set for verification. | |
342 | 142 virtual void prepare_for_verify(); |
143 }; | |
144 | |
145 #define G1_REM_SET_LOGGING 0 | |
146 | |
147 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
148 G1CollectedHeap* _g1; | |
149 int _n; | |
150 HeapWord* _start_first; | |
151 public: | |
152 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
153 _g1(g1), _n(0), _start_first(NULL) | |
154 {} | |
155 void do_MemRegion(MemRegion mr); | |
156 int n() { return _n; }; | |
157 HeapWord* start_first() { return _start_first; } | |
158 }; | |
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159 |
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160 class UpdateRSOopClosure: public OopClosure { |
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161 HeapRegion* _from; |
1861 | 162 G1RemSet* _rs; |
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163 int _worker_i; |
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164 |
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165 template <class T> void do_oop_work(T* p); |
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166 |
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167 public: |
1861 | 168 UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) : |
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169 _from(NULL), _rs(rs), _worker_i(worker_i) |
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170 {} |
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171 |
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172 void set_from(HeapRegion* from) { |
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173 assert(from != NULL, "from region must be non-NULL"); |
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174 _from = from; |
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175 } |
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176 |
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177 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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178 virtual void do_oop(oop* p) { do_oop_work(p); } |
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179 |
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180 // Override: this closure is idempotent. |
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181 // bool idempotent() { return true; } |
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182 bool apply_to_weak_ref_discovered_field() { return true; } |
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183 }; |
1705 | 184 |
185 class UpdateRSetImmediate: public OopsInHeapRegionClosure { | |
186 private: | |
187 G1RemSet* _g1_rem_set; | |
188 | |
189 template <class T> void do_oop_work(T* p); | |
190 public: | |
191 UpdateRSetImmediate(G1RemSet* rs) : | |
192 _g1_rem_set(rs) {} | |
193 | |
194 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
195 virtual void do_oop( oop* p) { do_oop_work(p); } | |
196 }; | |
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197 |
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198 class UpdateRSOrPushRefOopClosure: public OopClosure { |
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199 G1CollectedHeap* _g1; |
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200 G1RemSet* _g1_rem_set; |
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201 HeapRegion* _from; |
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202 OopsInHeapRegionClosure* _push_ref_cl; |
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203 bool _record_refs_into_cset; |
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204 int _worker_i; |
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205 |
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206 template <class T> void do_oop_work(T* p); |
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207 |
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208 public: |
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209 UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, |
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210 G1RemSet* rs, |
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211 OopsInHeapRegionClosure* push_ref_cl, |
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212 bool record_refs_into_cset, |
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213 int worker_i = 0) : |
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214 _g1(g1h), |
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215 _g1_rem_set(rs), |
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216 _from(NULL), |
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217 _record_refs_into_cset(record_refs_into_cset), |
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218 _push_ref_cl(push_ref_cl), |
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219 _worker_i(worker_i) { } |
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220 |
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221 void set_from(HeapRegion* from) { |
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222 assert(from != NULL, "from region must be non-NULL"); |
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223 _from = from; |
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224 } |
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225 |
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226 bool self_forwarded(oop obj) { |
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227 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); |
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228 return result; |
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229 } |
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230 |
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231 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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232 virtual void do_oop(oop* p) { do_oop_work(p); } |
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233 |
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234 bool apply_to_weak_ref_discovered_field() { return true; } |
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235 }; |
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236 |
1972 | 237 |
238 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |