Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | a2f7274eb6ef |
children | da91efe96a93 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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_G1OOPCLOSURES_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP | |
27 | |
342 | 28 class HeapRegion; |
29 class G1CollectedHeap; | |
30 class G1RemSet; | |
31 class ConcurrentMark; | |
32 class DirtyCardToOopClosure; | |
33 class CMBitMap; | |
34 class CMMarkStack; | |
35 class G1ParScanThreadState; | |
3771 | 36 class CMTask; |
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37 class ReferenceProcessor; |
342 | 38 |
39 // A class that scans oops in a given heap region (much as OopsInGenClosure | |
40 // scans oops in a generation.) | |
41 class OopsInHeapRegionClosure: public OopsInGenClosure { | |
42 protected: | |
43 HeapRegion* _from; | |
44 public: | |
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45 void set_region(HeapRegion* from) { _from = from; } |
342 | 46 }; |
47 | |
48 class G1ParClosureSuper : public OopsInHeapRegionClosure { | |
49 protected: | |
50 G1CollectedHeap* _g1; | |
51 G1RemSet* _g1_rem; | |
52 ConcurrentMark* _cm; | |
53 G1ParScanThreadState* _par_scan_state; | |
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54 uint _worker_id; |
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55 bool _during_initial_mark; |
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56 bool _mark_in_progress; |
342 | 57 public: |
58 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); | |
59 bool apply_to_weak_ref_discovered_field() { return true; } | |
60 }; | |
61 | |
1261 | 62 class G1ParPushHeapRSClosure : public G1ParClosureSuper { |
63 public: | |
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64 G1ParPushHeapRSClosure(G1CollectedHeap* g1, |
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65 G1ParScanThreadState* par_scan_state): |
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66 G1ParClosureSuper(g1, par_scan_state) { } |
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67 |
1261 | 68 template <class T> void do_oop_nv(T* p); |
69 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
70 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
71 }; | |
72 | |
342 | 73 class G1ParScanClosure : public G1ParClosureSuper { |
74 public: | |
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75 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : |
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76 G1ParClosureSuper(g1, par_scan_state) |
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77 { |
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78 assert(_ref_processor == NULL, "sanity"); |
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79 _ref_processor = rp; |
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80 } |
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81 |
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82 template <class T> void do_oop_nv(T* p); |
342 | 83 virtual void do_oop(oop* p) { do_oop_nv(p); } |
84 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
85 }; | |
86 | |
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87 #define G1_PARTIAL_ARRAY_MASK 0x2 |
342 | 88 |
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89 template <class T> inline bool has_partial_array_mask(T* ref) { |
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90 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
526 | 91 } |
92 | |
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93 template <class T> inline T* set_partial_array_mask(T obj) { |
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94 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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95 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK); |
526 | 96 } |
97 | |
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98 template <class T> inline oop clear_partial_array_mask(T* ref) { |
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99 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
526 | 100 } |
101 | |
342 | 102 class G1ParScanPartialArrayClosure : public G1ParClosureSuper { |
103 G1ParScanClosure _scanner; | |
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104 |
342 | 105 public: |
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106 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : |
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107 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp) |
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108 { |
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109 assert(_ref_processor == NULL, "sanity"); |
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110 } |
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111 |
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112 G1ParScanClosure* scanner() { |
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113 return &_scanner; |
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114 } |
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115 |
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116 template <class T> void do_oop_nv(T* p); |
342 | 117 virtual void do_oop(oop* p) { do_oop_nv(p); } |
118 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
119 }; | |
120 | |
5987 | 121 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
122 class G1ParCopyClosure : public G1ParClosureSuper { | |
123 G1ParScanClosure _scanner; | |
124 template <class T> void do_oop_work(T* p); | |
342 | 125 |
126 protected: | |
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127 // Mark the object if it's not already marked. This is used to mark |
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128 // objects pointed to by roots that are guaranteed not to move |
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129 // during the GC (i.e., non-CSet objects). It is MT-safe. |
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130 void mark_object(oop obj); |
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131 |
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132 // Mark the object if it's not already marked. This is used to mark |
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133 // objects pointed to by roots that have been forwarded during a |
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134 // GC. It is MT-safe. |
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135 void mark_forwarded_object(oop from_obj, oop to_obj); |
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136 |
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137 oop copy_to_survivor_space(oop obj); |
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138 |
342 | 139 public: |
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140 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, |
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141 ReferenceProcessor* rp) : |
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142 _scanner(g1, par_scan_state, rp), |
5987 | 143 G1ParClosureSuper(g1, par_scan_state) { |
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144 assert(_ref_processor == NULL, "sanity"); |
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145 } |
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146 |
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147 G1ParScanClosure* scanner() { return &_scanner; } |
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148 |
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149 template <class T> void do_oop_nv(T* p) { |
342 | 150 do_oop_work(p); |
151 } | |
152 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
153 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
154 }; | |
155 | |
1261 | 156 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure; |
157 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure; | |
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158 |
1261 | 159 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; |
160 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure; | |
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161 |
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162 // The following closure types are no longer used but are retained |
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163 // for historical reasons: |
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164 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure; |
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165 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure; |
1261 | 166 |
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167 // The following closure type is defined in g1_specialized_oop_closures.hpp: |
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168 // |
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169 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure; |
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170 |
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171 // We use a separate closure to handle references during evacuation |
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172 // failure processing. |
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173 // We could have used another instance of G1ParScanHeapEvacClosure |
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174 // (since that closure no longer assumes that the references it |
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175 // handles point into the collection set). |
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176 |
1261 | 177 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; |
342 | 178 |
179 class FilterIntoCSClosure: public OopClosure { | |
180 G1CollectedHeap* _g1; | |
181 OopClosure* _oc; | |
182 DirtyCardToOopClosure* _dcto_cl; | |
183 public: | |
184 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, | |
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185 G1CollectedHeap* g1, |
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186 OopClosure* oc) : |
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187 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } |
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188 |
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189 template <class T> void do_oop_nv(T* p); |
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190 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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191 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 192 bool apply_to_weak_ref_discovered_field() { return true; } |
193 bool do_header() { return false; } | |
194 }; | |
195 | |
196 class FilterOutOfRegionClosure: public OopClosure { | |
197 HeapWord* _r_bottom; | |
198 HeapWord* _r_end; | |
199 OopClosure* _oc; | |
200 public: | |
201 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); | |
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202 template <class T> void do_oop_nv(T* p); |
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203 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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204 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 205 bool apply_to_weak_ref_discovered_field() { return true; } |
206 bool do_header() { return false; } | |
207 }; | |
1972 | 208 |
3771 | 209 // Closure for iterating over object fields during concurrent marking |
210 class G1CMOopClosure : public OopClosure { | |
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211 private: |
3771 | 212 G1CollectedHeap* _g1h; |
213 ConcurrentMark* _cm; | |
214 CMTask* _task; | |
215 public: | |
216 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); | |
217 template <class T> void do_oop_nv(T* p); | |
218 virtual void do_oop( oop* p) { do_oop_nv(p); } | |
219 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
220 }; | |
221 | |
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222 // Closure to scan the root regions during concurrent marking |
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223 class G1RootRegionScanClosure : public OopClosure { |
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224 private: |
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225 G1CollectedHeap* _g1h; |
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226 ConcurrentMark* _cm; |
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227 uint _worker_id; |
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228 public: |
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229 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, |
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230 uint worker_id) : |
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231 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } |
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232 template <class T> void do_oop_nv(T* p); |
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233 virtual void do_oop( oop* p) { do_oop_nv(p); } |
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234 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
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235 }; |
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236 |
4839 | 237 // Closure that applies the given two closures in sequence. |
238 // Used by the RSet refinement code (when updating RSets | |
239 // during an evacuation pause) to record cards containing | |
240 // pointers into the collection set. | |
241 | |
242 class G1Mux2Closure : public OopClosure { | |
243 OopClosure* _c1; | |
244 OopClosure* _c2; | |
245 public: | |
246 G1Mux2Closure(OopClosure *c1, OopClosure *c2); | |
247 template <class T> void do_oop_nv(T* p); | |
248 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
249 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
250 }; | |
251 | |
252 // A closure that returns true if it is actually applied | |
253 // to a reference | |
254 | |
255 class G1TriggerClosure : public OopClosure { | |
256 bool _triggered; | |
257 public: | |
258 G1TriggerClosure(); | |
259 bool triggered() const { return _triggered; } | |
260 template <class T> void do_oop_nv(T* p); | |
261 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
262 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
263 }; | |
264 | |
265 // A closure which uses a triggering closure to determine | |
266 // whether to apply an oop closure. | |
267 | |
268 class G1InvokeIfNotTriggeredClosure: public OopClosure { | |
269 G1TriggerClosure* _trigger_cl; | |
270 OopClosure* _oop_cl; | |
271 public: | |
272 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); | |
273 template <class T> void do_oop_nv(T* p); | |
274 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
275 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
276 }; | |
277 | |
278 class G1UpdateRSOrPushRefOopClosure: public OopClosure { | |
279 G1CollectedHeap* _g1; | |
280 G1RemSet* _g1_rem_set; | |
281 HeapRegion* _from; | |
282 OopsInHeapRegionClosure* _push_ref_cl; | |
283 bool _record_refs_into_cset; | |
284 int _worker_i; | |
285 | |
286 public: | |
287 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
288 G1RemSet* rs, | |
289 OopsInHeapRegionClosure* push_ref_cl, | |
290 bool record_refs_into_cset, | |
291 int worker_i = 0); | |
292 | |
293 void set_from(HeapRegion* from) { | |
294 assert(from != NULL, "from region must be non-NULL"); | |
295 _from = from; | |
296 } | |
297 | |
298 bool self_forwarded(oop obj) { | |
299 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); | |
300 return result; | |
301 } | |
302 | |
303 bool apply_to_weak_ref_discovered_field() { return true; } | |
304 | |
305 template <class T> void do_oop_nv(T* p); | |
306 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
307 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
308 }; | |
309 | |
1972 | 310 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP |