Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 11239:6c098f64a7a6
added support for handling volatile registers across native runtime calls
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 07 Aug 2013 01:52:44 +0200 |
parents | f22cbff51c12 |
children | cefad50507d8 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
10405 | 28 #include "gc_implementation/shared/gcTimer.hpp" |
29 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 30 #include "gc_interface/collectedHeap.hpp" |
31 #include "gc_interface/collectedHeap.inline.hpp" | |
32 #include "memory/referencePolicy.hpp" | |
33 #include "memory/referenceProcessor.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/jniHandles.hpp" | |
0 | 37 |
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38 ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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39 ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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40 bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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41 jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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42 |
0 | 43 void referenceProcessor_init() { |
44 ReferenceProcessor::init_statics(); | |
45 } | |
46 | |
47 void ReferenceProcessor::init_statics() { | |
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48 // We need a monotonically non-deccreasing time in ms but |
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49 // os::javaTimeMillis() does not guarantee monotonicity. |
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50 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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51 |
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52 // Initialize the soft ref timestamp clock. |
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53 _soft_ref_timestamp_clock = now; |
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54 // Also update the soft ref clock in j.l.r.SoftReference |
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55 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 56 |
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57 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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58 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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59 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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60 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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61 vm_exit_during_initialization("Could not allocate reference policy object"); |
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62 } |
0 | 63 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
64 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
65 "Unrecongnized RefDiscoveryPolicy"); | |
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66 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 67 } |
68 | |
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69 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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70 #ifdef ASSERT |
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71 // Verify that we're not currently discovering refs |
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72 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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73 |
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74 if (check_no_refs) { |
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75 // Verify that the discovered lists are empty |
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76 verify_no_references_recorded(); |
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77 } |
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78 #endif // ASSERT |
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79 |
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80 // Someone could have modified the value of the static |
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81 // field in the j.l.r.SoftReference class that holds the |
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82 // soft reference timestamp clock using reflection or |
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83 // Unsafe between GCs. Unconditionally update the static |
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84 // field in ReferenceProcessor here so that we use the new |
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85 // value during reference discovery. |
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86 |
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87 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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88 _discovering_refs = true; |
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89 } |
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90 |
0 | 91 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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92 bool mt_processing, |
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93 uint mt_processing_degree, |
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94 bool mt_discovery, |
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95 uint mt_discovery_degree, |
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96 bool atomic_discovery, |
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97 BoolObjectClosure* is_alive_non_header, |
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98 bool discovered_list_needs_barrier) : |
0 | 99 _discovering_refs(false), |
100 _enqueuing_is_done(false), | |
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101 _is_alive_non_header(is_alive_non_header), |
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102 _discovered_list_needs_barrier(discovered_list_needs_barrier), |
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103 _bs(NULL), |
0 | 104 _processing_is_mt(mt_processing), |
105 _next_id(0) | |
106 { | |
107 _span = span; | |
108 _discovery_is_atomic = atomic_discovery; | |
109 _discovery_is_mt = mt_discovery; | |
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110 _num_q = MAX2(1U, mt_processing_degree); |
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111 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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112 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
6197 | 113 _max_num_q * number_of_subclasses_of_ref(), mtGC); |
114 | |
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115 if (_discovered_refs == NULL) { |
0 | 116 vm_exit_during_initialization("Could not allocated RefProc Array"); |
117 } | |
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118 _discoveredSoftRefs = &_discovered_refs[0]; |
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119 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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120 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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121 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
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122 |
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123 // Initialize all entries to NULL |
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124 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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125 _discovered_refs[i].set_head(NULL); |
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126 _discovered_refs[i].set_length(0); |
0 | 127 } |
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128 |
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129 // If we do barriers, cache a copy of the barrier set. |
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130 if (discovered_list_needs_barrier) { |
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131 _bs = Universe::heap()->barrier_set(); |
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132 } |
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133 setup_policy(false /* default soft ref policy */); |
0 | 134 } |
135 | |
136 #ifndef PRODUCT | |
137 void ReferenceProcessor::verify_no_references_recorded() { | |
138 guarantee(!_discovering_refs, "Discovering refs?"); | |
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139 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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140 guarantee(_discovered_refs[i].is_empty(), |
0 | 141 "Found non-empty discovered list"); |
142 } | |
143 } | |
144 #endif | |
145 | |
146 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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147 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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148 if (UseCompressedOops) { |
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149 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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150 } else { |
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151 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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152 } |
0 | 153 } |
154 } | |
155 | |
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156 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 157 // Update (advance) the soft ref master clock field. This must be done |
158 // after processing the soft ref list. | |
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159 |
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160 // We need a monotonically non-deccreasing time in ms but |
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161 // os::javaTimeMillis() does not guarantee monotonicity. |
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162 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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163 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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164 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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165 |
0 | 166 NOT_PRODUCT( |
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167 if (now < _soft_ref_timestamp_clock) { |
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168 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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169 _soft_ref_timestamp_clock, now); |
0 | 170 } |
171 ) | |
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172 // The values of now and _soft_ref_timestamp_clock are set using |
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173 // javaTimeNanos(), which is guaranteed to be monotonically |
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174 // non-decreasing provided the underlying platform provides such |
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175 // a time source (and it is bug free). |
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176 // In product mode, however, protect ourselves from non-monotonicty. |
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177 if (now > _soft_ref_timestamp_clock) { |
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178 _soft_ref_timestamp_clock = now; |
0 | 179 java_lang_ref_SoftReference::set_clock(now); |
180 } | |
181 // Else leave clock stalled at its old value until time progresses | |
182 // past clock value. | |
183 } | |
184 | |
10405 | 185 size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
186 size_t total = 0; | |
187 for (uint i = 0; i < _max_num_q; ++i) { | |
188 total += lists[i].length(); | |
189 } | |
190 return total; | |
191 } | |
192 | |
193 ReferenceProcessorStats ReferenceProcessor::process_discovered_references( | |
0 | 194 BoolObjectClosure* is_alive, |
195 OopClosure* keep_alive, | |
196 VoidClosure* complete_gc, | |
10405 | 197 AbstractRefProcTaskExecutor* task_executor, |
198 GCTimer* gc_timer) { | |
0 | 199 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
200 | |
201 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
202 // Stop treating discovered references specially. | |
203 disable_discovery(); | |
204 | |
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205 // If discovery was concurrent, someone could have modified |
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206 // the value of the static field in the j.l.r.SoftReference |
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207 // class that holds the soft reference timestamp clock using |
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208 // reflection or Unsafe between when discovery was enabled and |
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209 // now. Unconditionally update the static field in ReferenceProcessor |
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210 // here so that we use the new value during processing of the |
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211 // discovered soft refs. |
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212 |
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213 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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214 |
0 | 215 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 216 |
0 | 217 // Soft references |
10405 | 218 size_t soft_count = 0; |
0 | 219 { |
10405 | 220 GCTraceTime tt("SoftReference", trace_time, false, gc_timer); |
221 soft_count = | |
222 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
223 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 224 } |
225 | |
226 update_soft_ref_master_clock(); | |
227 | |
228 // Weak references | |
10405 | 229 size_t weak_count = 0; |
0 | 230 { |
10405 | 231 GCTraceTime tt("WeakReference", trace_time, false, gc_timer); |
232 weak_count = | |
233 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
234 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 235 } |
236 | |
237 // Final references | |
10405 | 238 size_t final_count = 0; |
0 | 239 { |
10405 | 240 GCTraceTime tt("FinalReference", trace_time, false, gc_timer); |
241 final_count = | |
242 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
243 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 244 } |
245 | |
246 // Phantom references | |
10405 | 247 size_t phantom_count = 0; |
0 | 248 { |
10405 | 249 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer); |
250 phantom_count = | |
251 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
252 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 253 } |
254 | |
255 // Weak global JNI references. It would make more sense (semantically) to | |
256 // traverse these simultaneously with the regular weak references above, but | |
257 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
258 // thus use JNI weak references to circumvent the phantom references and | |
259 // resurrect a "post-mortem" object. | |
260 { | |
10405 | 261 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer); |
0 | 262 if (task_executor != NULL) { |
263 task_executor->set_single_threaded_mode(); | |
264 } | |
265 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
266 } | |
10405 | 267 |
268 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 269 } |
270 | |
271 #ifndef PRODUCT | |
272 // Calculate the number of jni handles. | |
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273 uint ReferenceProcessor::count_jni_refs() { |
0 | 274 class AlwaysAliveClosure: public BoolObjectClosure { |
275 public: | |
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276 virtual bool do_object_b(oop obj) { return true; } |
0 | 277 }; |
278 | |
279 class CountHandleClosure: public OopClosure { | |
280 private: | |
281 int _count; | |
282 public: | |
283 CountHandleClosure(): _count(0) {} | |
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284 void do_oop(oop* unused) { _count++; } |
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285 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 286 int count() { return _count; } |
287 }; | |
288 CountHandleClosure global_handle_count; | |
289 AlwaysAliveClosure always_alive; | |
290 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
291 return global_handle_count.count(); | |
292 } | |
293 #endif | |
294 | |
295 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
296 OopClosure* keep_alive, | |
297 VoidClosure* complete_gc) { | |
298 #ifndef PRODUCT | |
299 if (PrintGCDetails && PrintReferenceGC) { | |
300 unsigned int count = count_jni_refs(); | |
301 gclog_or_tty->print(", %u refs", count); | |
302 } | |
303 #endif | |
304 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
305 complete_gc->do_void(); | |
306 } | |
307 | |
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308 template <class T> |
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309 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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310 AbstractRefProcTaskExecutor* task_executor) { |
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311 |
0 | 312 // Remember old value of pending references list |
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313 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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314 T old_pending_list_value = *pending_list_addr; |
0 | 315 |
316 // Enqueue references that are not made active again, and | |
317 // clear the decks for the next collection (cycle). | |
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318 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
0 | 319 // Do the oop-check on pending_list_addr missed in |
320 // enqueue_discovered_reflist. We should probably | |
321 // do a raw oop_check so that future such idempotent | |
322 // oop_stores relying on the oop-check side-effect | |
323 // may be elided automatically and safely without | |
324 // affecting correctness. | |
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325 oop_store(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 326 |
327 // Stop treating discovered references specially. | |
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328 ref->disable_discovery(); |
0 | 329 |
330 // Return true if new pending references were added | |
331 return old_pending_list_value != *pending_list_addr; | |
332 } | |
333 | |
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334 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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335 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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336 if (UseCompressedOops) { |
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337 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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338 } else { |
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339 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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340 } |
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341 } |
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342 |
0 | 343 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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344 HeapWord* pending_list_addr) { |
0 | 345 // Given a list of refs linked through the "discovered" field |
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346 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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347 // thus distinguishing them from active References, then |
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348 // prepend them to the pending list. |
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349 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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350 // the "next" field is used to chain the pending list, not the discovered |
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351 // field. |
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352 |
0 | 353 if (TraceReferenceGC && PrintGCDetails) { |
354 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
355 INTPTR_FORMAT, (address)refs_list.head()); | |
356 } | |
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357 |
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358 oop obj = NULL; |
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359 oop next_d = refs_list.head(); |
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360 if (pending_list_uses_discovered_field()) { // New behaviour |
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361 // Walk down the list, self-looping the next field |
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362 // so that the References are not considered active. |
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363 while (obj != next_d) { |
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364 obj = next_d; |
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365 assert(obj->is_instanceRef(), "should be reference object"); |
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366 next_d = java_lang_ref_Reference::discovered(obj); |
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367 if (TraceReferenceGC && PrintGCDetails) { |
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368 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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369 obj, next_d); |
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370 } |
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371 assert(java_lang_ref_Reference::next(obj) == NULL, |
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372 "Reference not active; should not be discovered"); |
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373 // Self-loop next, so as to make Ref not active. |
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374 java_lang_ref_Reference::set_next(obj, obj); |
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375 if (next_d == obj) { // obj is last |
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376 // Swap refs_list into pendling_list_addr and |
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377 // set obj's discovered to what we read from pending_list_addr. |
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378 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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379 // Need oop_check on pending_list_addr above; |
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380 // see special oop-check code at the end of |
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381 // enqueue_discovered_reflists() further below. |
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382 java_lang_ref_Reference::set_discovered(obj, old); // old may be NULL |
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383 } |
0 | 384 } |
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385 } else { // Old behaviour |
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386 // Walk down the list, copying the discovered field into |
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387 // the next field and clearing the discovered field. |
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388 while (obj != next_d) { |
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389 obj = next_d; |
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390 assert(obj->is_instanceRef(), "should be reference object"); |
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391 next_d = java_lang_ref_Reference::discovered(obj); |
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392 if (TraceReferenceGC && PrintGCDetails) { |
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393 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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394 obj, next_d); |
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395 } |
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396 assert(java_lang_ref_Reference::next(obj) == NULL, |
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397 "The reference should not be enqueued"); |
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398 if (next_d == obj) { // obj is last |
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399 // Swap refs_list into pendling_list_addr and |
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400 // set obj's next to what we read from pending_list_addr. |
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401 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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402 // Need oop_check on pending_list_addr above; |
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403 // see special oop-check code at the end of |
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404 // enqueue_discovered_reflists() further below. |
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405 if (old == NULL) { |
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406 // obj should be made to point to itself, since |
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407 // pending list was empty. |
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408 java_lang_ref_Reference::set_next(obj, obj); |
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409 } else { |
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410 java_lang_ref_Reference::set_next(obj, old); |
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411 } |
0 | 412 } else { |
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413 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 414 } |
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415 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 416 } |
417 } | |
418 } | |
419 | |
420 // Parallel enqueue task | |
421 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
422 public: | |
423 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
424 DiscoveredList discovered_refs[], | |
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425 HeapWord* pending_list_addr, |
0 | 426 int n_queues) |
427 : EnqueueTask(ref_processor, discovered_refs, | |
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428 pending_list_addr, n_queues) |
0 | 429 { } |
430 | |
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431 virtual void work(unsigned int work_id) { |
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432 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 433 // Simplest first cut: static partitioning. |
434 int index = work_id; | |
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435 // The increment on "index" must correspond to the maximum number of queues |
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436 // (n_queues) with which that ReferenceProcessor was created. That |
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437 // is because of the "clever" way the discovered references lists were |
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438 // allocated and are indexed into. |
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439 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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440 for (int j = 0; |
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441 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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442 j++, index += _n_queues) { |
0 | 443 _ref_processor.enqueue_discovered_reflist( |
444 _refs_lists[index], _pending_list_addr); | |
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445 _refs_lists[index].set_head(NULL); |
0 | 446 _refs_lists[index].set_length(0); |
447 } | |
448 } | |
449 }; | |
450 | |
451 // Enqueue references that are not made active again | |
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452 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 453 AbstractRefProcTaskExecutor* task_executor) { |
454 if (_processing_is_mt && task_executor != NULL) { | |
455 // Parallel code | |
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456 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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457 pending_list_addr, _max_num_q); |
0 | 458 task_executor->execute(tsk); |
459 } else { | |
460 // Serial code: call the parent class's implementation | |
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461 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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462 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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463 _discovered_refs[i].set_head(NULL); |
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464 _discovered_refs[i].set_length(0); |
0 | 465 } |
466 } | |
467 } | |
468 | |
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469 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 470 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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471 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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472 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 473 "discovered field is bad"); |
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474 _next = discovered; |
0 | 475 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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476 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 477 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
478 "Wrong oop found in java.lang.Reference object"); | |
479 assert(allow_null_referent ? | |
480 _referent->is_oop_or_null() | |
481 : _referent->is_oop(), | |
482 "bad referent"); | |
483 } | |
484 | |
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485 void DiscoveredListIterator::remove() { |
0 | 486 assert(_ref->is_oop(), "Dropping a bad reference"); |
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487 oop_store_raw(_discovered_addr, NULL); |
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488 |
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489 // First _prev_next ref actually points into DiscoveredList (gross). |
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490 oop new_next; |
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491 if (_next == _ref) { |
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492 // At the end of the list, we should make _prev point to itself. |
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493 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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494 // and _prev will be NULL. |
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495 new_next = _prev; |
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496 } else { |
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497 new_next = _next; |
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498 } |
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499 |
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500 if (UseCompressedOops) { |
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501 // Remove Reference object from list. |
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502 oopDesc::encode_store_heap_oop((narrowOop*)_prev_next, new_next); |
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503 } else { |
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504 // Remove Reference object from list. |
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505 oopDesc::store_heap_oop((oop*)_prev_next, new_next); |
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506 } |
0 | 507 NOT_PRODUCT(_removed++); |
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508 _refs_list.dec_length(1); |
0 | 509 } |
510 | |
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511 // Make the Reference object active again. |
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512 void DiscoveredListIterator::make_active() { |
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513 // For G1 we don't want to use set_next - it |
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514 // will dirty the card for the next field of |
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515 // the reference object and will fail |
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516 // CT verification. |
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517 if (UseG1GC) { |
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518 BarrierSet* bs = oopDesc::bs(); |
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519 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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520 |
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521 if (UseCompressedOops) { |
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522 bs->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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523 } else { |
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524 bs->write_ref_field_pre((oop*)next_addr, NULL); |
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525 } |
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526 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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527 } else { |
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528 java_lang_ref_Reference::set_next(_ref, NULL); |
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529 } |
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530 } |
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531 |
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532 void DiscoveredListIterator::clear_referent() { |
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533 oop_store_raw(_referent_addr, NULL); |
0 | 534 } |
535 | |
536 // NOTE: process_phase*() are largely similar, and at a high level | |
537 // merely iterate over the extant list applying a predicate to | |
538 // each of its elements and possibly removing that element from the | |
539 // list and applying some further closures to that element. | |
540 // We should consider the possibility of replacing these | |
541 // process_phase*() methods by abstracting them into | |
542 // a single general iterator invocation that receives appropriate | |
543 // closures that accomplish this work. | |
544 | |
545 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
546 // referents are not alive, but that should be kept alive for policy reasons. | |
547 // Keep alive the transitive closure of all such referents. | |
548 void | |
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549 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 550 ReferencePolicy* policy, |
551 BoolObjectClosure* is_alive, | |
552 OopClosure* keep_alive, | |
553 VoidClosure* complete_gc) { | |
554 assert(policy != NULL, "Must have a non-NULL policy"); | |
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555 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 556 // Decide which softly reachable refs should be kept alive. |
557 while (iter.has_next()) { | |
558 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
559 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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560 if (referent_is_dead && |
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561 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 562 if (TraceReferenceGC) { |
563 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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564 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 565 } |
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566 // Remove Reference object from list |
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567 iter.remove(); |
0 | 568 // Make the Reference object active again |
569 iter.make_active(); | |
570 // keep the referent around | |
571 iter.make_referent_alive(); | |
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572 iter.move_to_next(); |
0 | 573 } else { |
574 iter.next(); | |
575 } | |
576 } | |
577 // Close the reachable set | |
578 complete_gc->do_void(); | |
579 NOT_PRODUCT( | |
580 if (PrintGCDetails && TraceReferenceGC) { | |
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581 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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582 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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583 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 584 } |
585 ) | |
586 } | |
587 | |
588 // Traverse the list and remove any Refs that are not active, or | |
589 // whose referents are either alive or NULL. | |
590 void | |
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591 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 592 BoolObjectClosure* is_alive, |
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593 OopClosure* keep_alive) { |
0 | 594 assert(discovery_is_atomic(), "Error"); |
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595 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 596 while (iter.has_next()) { |
597 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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598 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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599 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 600 if (iter.is_referent_alive()) { |
601 if (TraceReferenceGC) { | |
602 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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603 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 604 } |
605 // The referent is reachable after all. | |
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606 // Remove Reference object from list. |
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607 iter.remove(); |
0 | 608 // Update the referent pointer as necessary: Note that this |
609 // should not entail any recursive marking because the | |
610 // referent must already have been traversed. | |
611 iter.make_referent_alive(); | |
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612 iter.move_to_next(); |
0 | 613 } else { |
614 iter.next(); | |
615 } | |
616 } | |
617 NOT_PRODUCT( | |
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618 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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619 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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620 "Refs in discovered list " INTPTR_FORMAT, |
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621 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 622 } |
623 ) | |
624 } | |
625 | |
626 void | |
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627 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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628 BoolObjectClosure* is_alive, |
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629 OopClosure* keep_alive, |
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630 VoidClosure* complete_gc) { |
0 | 631 assert(!discovery_is_atomic(), "Error"); |
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632 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 633 while (iter.has_next()) { |
634 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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635 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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636 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 637 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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638 next != NULL)) { |
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639 assert(next->is_oop_or_null(), "bad next field"); |
0 | 640 // Remove Reference object from list |
641 iter.remove(); | |
642 // Trace the cohorts | |
643 iter.make_referent_alive(); | |
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644 if (UseCompressedOops) { |
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645 keep_alive->do_oop((narrowOop*)next_addr); |
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646 } else { |
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647 keep_alive->do_oop((oop*)next_addr); |
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648 } |
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649 iter.move_to_next(); |
0 | 650 } else { |
651 iter.next(); | |
652 } | |
653 } | |
654 // Now close the newly reachable set | |
655 complete_gc->do_void(); | |
656 NOT_PRODUCT( | |
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657 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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658 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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659 "Refs in discovered list " INTPTR_FORMAT, |
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660 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 661 } |
662 ) | |
663 } | |
664 | |
665 // Traverse the list and process the referents, by either | |
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666 // clearing them or keeping them (and their reachable |
0 | 667 // closure) alive. |
668 void | |
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669 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 670 bool clear_referent, |
671 BoolObjectClosure* is_alive, | |
672 OopClosure* keep_alive, | |
673 VoidClosure* complete_gc) { | |
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674 ResourceMark rm; |
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675 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 676 while (iter.has_next()) { |
677 iter.update_discovered(); | |
678 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
679 if (clear_referent) { | |
680 // NULL out referent pointer | |
681 iter.clear_referent(); | |
682 } else { | |
683 // keep the referent around | |
684 iter.make_referent_alive(); | |
685 } | |
686 if (TraceReferenceGC) { | |
687 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
688 clear_referent ? "cleared " : "", | |
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689 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 690 } |
691 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
692 iter.next(); | |
693 } | |
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694 // Remember to update the next pointer of the last ref. |
0 | 695 iter.update_discovered(); |
696 // Close the reachable set | |
697 complete_gc->do_void(); | |
698 } | |
699 | |
700 void | |
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701 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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702 oop obj = NULL; |
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703 oop next = refs_list.head(); |
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704 while (next != obj) { |
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705 obj = next; |
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706 next = java_lang_ref_Reference::discovered(obj); |
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707 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 708 } |
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709 refs_list.set_head(NULL); |
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710 refs_list.set_length(0); |
0 | 711 } |
712 | |
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713 void |
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714 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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715 clear_discovered_references(refs_list); |
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716 } |
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717 |
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718 void ReferenceProcessor::abandon_partial_discovery() { |
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719 // loop over the lists |
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720 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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721 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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722 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
342
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723 } |
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724 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 725 } |
726 } | |
727 | |
728 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
729 public: | |
730 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
731 DiscoveredList refs_lists[], | |
732 ReferencePolicy* policy, | |
733 bool marks_oops_alive) | |
734 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
735 _policy(policy) | |
736 { } | |
737 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
738 OopClosure& keep_alive, | |
739 VoidClosure& complete_gc) | |
740 { | |
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741 Thread* thr = Thread::current(); |
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742 int refs_list_index = ((WorkerThread*)thr)->id(); |
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743 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 744 &is_alive, &keep_alive, &complete_gc); |
745 } | |
746 private: | |
747 ReferencePolicy* _policy; | |
748 }; | |
749 | |
750 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
751 public: | |
752 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
753 DiscoveredList refs_lists[], | |
754 bool marks_oops_alive) | |
755 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
756 { } | |
757 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
758 OopClosure& keep_alive, | |
759 VoidClosure& complete_gc) | |
760 { | |
761 _ref_processor.process_phase2(_refs_lists[i], | |
762 &is_alive, &keep_alive, &complete_gc); | |
763 } | |
764 }; | |
765 | |
766 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
767 public: | |
768 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
769 DiscoveredList refs_lists[], | |
770 bool clear_referent, | |
771 bool marks_oops_alive) | |
772 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
773 _clear_referent(clear_referent) | |
774 { } | |
775 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
776 OopClosure& keep_alive, | |
777 VoidClosure& complete_gc) | |
778 { | |
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779 // Don't use "refs_list_index" calculated in this way because |
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780 // balance_queues() has moved the Ref's into the first n queues. |
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781 // Thread* thr = Thread::current(); |
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782 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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783 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 784 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
785 &is_alive, &keep_alive, &complete_gc); | |
786 } | |
787 private: | |
788 bool _clear_referent; | |
789 }; | |
790 | |
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791 void ReferenceProcessor::set_discovered(oop ref, oop value) { |
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792 if (_discovered_list_needs_barrier) { |
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793 java_lang_ref_Reference::set_discovered(ref, value); |
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794 } else { |
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795 java_lang_ref_Reference::set_discovered_raw(ref, value); |
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796 } |
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797 } |
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798 |
0 | 799 // Balances reference queues. |
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800 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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801 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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802 // corresponding to the active workers will be processed. |
0 | 803 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
804 { | |
805 // calculate total length | |
806 size_t total_refs = 0; | |
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807 if (TraceReferenceGC && PrintGCDetails) { |
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808 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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809 } |
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810 |
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811 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 812 total_refs += ref_lists[i].length(); |
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813 if (TraceReferenceGC && PrintGCDetails) { |
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814 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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815 } |
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816 } |
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817 if (TraceReferenceGC && PrintGCDetails) { |
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818 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 819 } |
820 size_t avg_refs = total_refs / _num_q + 1; | |
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821 uint to_idx = 0; |
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822 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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823 bool move_all = false; |
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824 if (from_idx >= _num_q) { |
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825 move_all = ref_lists[from_idx].length() > 0; |
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826 } |
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827 while ((ref_lists[from_idx].length() > avg_refs) || |
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828 move_all) { |
0 | 829 assert(to_idx < _num_q, "Sanity Check!"); |
830 if (ref_lists[to_idx].length() < avg_refs) { | |
831 // move superfluous refs | |
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832 size_t refs_to_move; |
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833 // Move all the Ref's if the from queue will not be processed. |
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834 if (move_all) { |
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835 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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836 avg_refs - ref_lists[to_idx].length()); |
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837 } else { |
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838 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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839 avg_refs - ref_lists[to_idx].length()); |
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840 } |
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841 |
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842 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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843 |
0 | 844 oop move_head = ref_lists[from_idx].head(); |
845 oop move_tail = move_head; | |
846 oop new_head = move_head; | |
847 // find an element to split the list on | |
848 for (size_t j = 0; j < refs_to_move; ++j) { | |
849 move_tail = new_head; | |
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850 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 851 } |
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852 |
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853 // Add the chain to the to list. |
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854 if (ref_lists[to_idx].head() == NULL) { |
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855 // to list is empty. Make a loop at the end. |
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856 set_discovered(move_tail, move_tail); |
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857 } else { |
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858 set_discovered(move_tail, ref_lists[to_idx].head()); |
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859 } |
0 | 860 ref_lists[to_idx].set_head(move_head); |
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861 ref_lists[to_idx].inc_length(refs_to_move); |
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862 |
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863 // Remove the chain from the from list. |
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864 if (move_tail == new_head) { |
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865 // We found the end of the from list. |
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866 ref_lists[from_idx].set_head(NULL); |
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867 } else { |
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868 ref_lists[from_idx].set_head(new_head); |
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869 } |
452
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870 ref_lists[from_idx].dec_length(refs_to_move); |
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871 if (ref_lists[from_idx].length() == 0) { |
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872 break; |
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873 } |
0 | 874 } else { |
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875 to_idx = (to_idx + 1) % _num_q; |
0 | 876 } |
877 } | |
878 } | |
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879 #ifdef ASSERT |
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880 size_t balanced_total_refs = 0; |
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881 for (uint i = 0; i < _max_num_q; ++i) { |
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882 balanced_total_refs += ref_lists[i].length(); |
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883 if (TraceReferenceGC && PrintGCDetails) { |
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884 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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885 } |
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886 } |
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887 if (TraceReferenceGC && PrintGCDetails) { |
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888 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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889 gclog_or_tty->flush(); |
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890 } |
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891 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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892 #endif |
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893 } |
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894 |
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895 void ReferenceProcessor::balance_all_queues() { |
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896 balance_queues(_discoveredSoftRefs); |
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897 balance_queues(_discoveredWeakRefs); |
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898 balance_queues(_discoveredFinalRefs); |
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899 balance_queues(_discoveredPhantomRefs); |
0 | 900 } |
901 | |
10405 | 902 size_t |
0 | 903 ReferenceProcessor::process_discovered_reflist( |
904 DiscoveredList refs_lists[], | |
905 ReferencePolicy* policy, | |
906 bool clear_referent, | |
907 BoolObjectClosure* is_alive, | |
908 OopClosure* keep_alive, | |
909 VoidClosure* complete_gc, | |
910 AbstractRefProcTaskExecutor* task_executor) | |
911 { | |
1833
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912 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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913 // If discovery used MT and a dynamic number of GC threads, then |
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914 // the queues must be balanced for correctness if fewer than the |
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915 // maximum number of queues were used. The number of queue used |
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916 // during discovery may be different than the number to be used |
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917 // for processing so don't depend of _num_q < _max_num_q as part |
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918 // of the test. |
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919 bool must_balance = _discovery_is_mt; |
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920 |
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921 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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922 must_balance) { |
0 | 923 balance_queues(refs_lists); |
924 } | |
10405 | 925 |
926 size_t total_list_count = total_count(refs_lists); | |
927 | |
0 | 928 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 929 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 930 } |
931 | |
932 // Phase 1 (soft refs only): | |
933 // . Traverse the list and remove any SoftReferences whose | |
934 // referents are not alive, but that should be kept alive for | |
935 // policy reasons. Keep alive the transitive closure of all | |
936 // such referents. | |
937 if (policy != NULL) { | |
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938 if (mt_processing) { |
0 | 939 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
940 task_executor->execute(phase1); | |
941 } else { | |
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942 for (uint i = 0; i < _max_num_q; i++) { |
0 | 943 process_phase1(refs_lists[i], policy, |
944 is_alive, keep_alive, complete_gc); | |
945 } | |
946 } | |
947 } else { // policy == NULL | |
948 assert(refs_lists != _discoveredSoftRefs, | |
949 "Policy must be specified for soft references."); | |
950 } | |
951 | |
952 // Phase 2: | |
953 // . Traverse the list and remove any refs whose referents are alive. | |
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954 if (mt_processing) { |
0 | 955 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
956 task_executor->execute(phase2); | |
957 } else { | |
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958 for (uint i = 0; i < _max_num_q; i++) { |
0 | 959 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
960 } | |
961 } | |
962 | |
963 // Phase 3: | |
964 // . Traverse the list and process referents as appropriate. | |
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965 if (mt_processing) { |
0 | 966 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
967 task_executor->execute(phase3); | |
968 } else { | |
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969 for (uint i = 0; i < _max_num_q; i++) { |
0 | 970 process_phase3(refs_lists[i], clear_referent, |
971 is_alive, keep_alive, complete_gc); | |
972 } | |
973 } | |
10405 | 974 |
975 return total_list_count; | |
0 | 976 } |
977 | |
978 void ReferenceProcessor::clean_up_discovered_references() { | |
979 // loop over the lists | |
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980 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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981 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 982 gclog_or_tty->print_cr( |
983 "\nScrubbing %s discovered list of Null referents", | |
984 list_name(i)); | |
985 } | |
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986 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 987 } |
988 } | |
989 | |
990 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
991 assert(!discovery_is_atomic(), "Else why call this method?"); | |
992 DiscoveredListIterator iter(refs_list, NULL, NULL); | |
993 while (iter.has_next()) { | |
994 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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995 oop next = java_lang_ref_Reference::next(iter.obj()); |
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996 assert(next->is_oop_or_null(), "bad next field"); |
0 | 997 // If referent has been cleared or Reference is not active, |
998 // drop it. | |
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999 if (iter.referent() == NULL || next != NULL) { |
0 | 1000 debug_only( |
1001 if (PrintGCDetails && TraceReferenceGC) { | |
1002 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
1003 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
1004 " and referent: " INTPTR_FORMAT, | |
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1005 iter.obj(), next, iter.referent()); |
0 | 1006 } |
1007 ) | |
1008 // Remove Reference object from list | |
1009 iter.remove(); | |
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1010 iter.move_to_next(); |
0 | 1011 } else { |
1012 iter.next(); | |
1013 } | |
1014 } | |
1015 NOT_PRODUCT( | |
1016 if (PrintGCDetails && TraceReferenceGC) { | |
1017 gclog_or_tty->print( | |
1018 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1019 iter.removed(), iter.processed()); | |
1020 } | |
1021 ) | |
1022 } | |
1023 | |
1024 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1025 uint id = 0; |
0 | 1026 // Determine the queue index to use for this object. |
1027 if (_discovery_is_mt) { | |
1028 // During a multi-threaded discovery phase, | |
1029 // each thread saves to its "own" list. | |
1030 Thread* thr = Thread::current(); | |
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1031 id = thr->as_Worker_thread()->id(); |
0 | 1032 } else { |
1033 // single-threaded discovery, we save in round-robin | |
1034 // fashion to each of the lists. | |
1035 if (_processing_is_mt) { | |
1036 id = next_id(); | |
1037 } | |
1038 } | |
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1039 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1040 |
1041 // Get the discovered queue to which we will add | |
1042 DiscoveredList* list = NULL; | |
1043 switch (rt) { | |
1044 case REF_OTHER: | |
1045 // Unknown reference type, no special treatment | |
1046 break; | |
1047 case REF_SOFT: | |
1048 list = &_discoveredSoftRefs[id]; | |
1049 break; | |
1050 case REF_WEAK: | |
1051 list = &_discoveredWeakRefs[id]; | |
1052 break; | |
1053 case REF_FINAL: | |
1054 list = &_discoveredFinalRefs[id]; | |
1055 break; | |
1056 case REF_PHANTOM: | |
1057 list = &_discoveredPhantomRefs[id]; | |
1058 break; | |
1059 case REF_NONE: | |
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1060 // we should not reach here if we are an InstanceRefKlass |
0 | 1061 default: |
1062 ShouldNotReachHere(); | |
1063 } | |
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1064 if (TraceReferenceGC && PrintGCDetails) { |
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1065 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1066 } |
0 | 1067 return list; |
1068 } | |
1069 | |
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1070 inline void |
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1071 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1072 oop obj, |
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1073 HeapWord* discovered_addr) { |
0 | 1074 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1075 // First we must make sure this object is only enqueued once. CAS in a non null | |
1076 // discovered_addr. | |
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1077 oop current_head = refs_list.head(); |
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1078 // The last ref must have its discovered field pointing to itself. |
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1079 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1080 |
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1081 // Note: In the case of G1, this specific pre-barrier is strictly |
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1082 // not necessary because the only case we are interested in |
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1083 // here is when *discovered_addr is NULL (see the CAS further below), |
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1084 // so this will expand to nothing. As a result, we have manually |
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1085 // elided this out for G1, but left in the test for some future |
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1086 // collector that might have need for a pre-barrier here, e.g.:- |
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1087 // _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1088 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1089 "Need to check non-G1 collector: " |
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1090 "may need a pre-write-barrier for CAS from NULL below"); |
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1091 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1092 NULL); |
0 | 1093 if (retest == NULL) { |
1094 // This thread just won the right to enqueue the object. | |
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1095 // We have separate lists for enqueueing, so no synchronization |
0 | 1096 // is necessary. |
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1097 refs_list.set_head(obj); |
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1098 refs_list.inc_length(1); |
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1099 if (_discovered_list_needs_barrier) { |
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1100 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1101 } |
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1102 |
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1103 if (TraceReferenceGC) { |
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1104 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1105 obj, obj->klass()->internal_name()); |
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1106 } |
0 | 1107 } else { |
1108 // If retest was non NULL, another thread beat us to it: | |
1109 // The reference has already been discovered... | |
1110 if (TraceReferenceGC) { | |
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1111 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1112 obj, obj->klass()->internal_name()); |
0 | 1113 } |
1114 } | |
1115 } | |
1116 | |
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1117 #ifndef PRODUCT |
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1118 // Non-atomic (i.e. concurrent) discovery might allow us |
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1119 // to observe j.l.References with NULL referents, being those |
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1120 // cleared concurrently by mutators during (or after) discovery. |
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1121 void ReferenceProcessor::verify_referent(oop obj) { |
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1122 bool da = discovery_is_atomic(); |
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1123 oop referent = java_lang_ref_Reference::referent(obj); |
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1124 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1125 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1126 INTPTR_FORMAT " during %satomic discovery ", |
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1127 (intptr_t)referent, (intptr_t)obj, da ? "" : "non-")); |
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1128 } |
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1129 #endif |
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1130 |
0 | 1131 // We mention two of several possible choices here: |
1132 // #0: if the reference object is not in the "originating generation" | |
1133 // (or part of the heap being collected, indicated by our "span" | |
1134 // we don't treat it specially (i.e. we scan it as we would | |
1135 // a normal oop, treating its references as strong references). | |
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1136 // This means that references can't be discovered unless their |
0 | 1137 // referent is also in the same span. This is the simplest, |
1138 // most "local" and most conservative approach, albeit one | |
1139 // that may cause weak references to be enqueued least promptly. | |
1140 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1141 // #1: the reference object may be in any generation (span), but if | |
1142 // the referent is in the generation (span) being currently collected | |
1143 // then we can discover the reference object, provided | |
1144 // the object has not already been discovered by | |
1145 // a different concurrently running collector (as may be the | |
1146 // case, for instance, if the reference object is in CMS and | |
1147 // the referent in DefNewGeneration), and provided the processing | |
1148 // of this reference object by the current collector will | |
1149 // appear atomic to every other collector in the system. | |
1150 // (Thus, for instance, a concurrent collector may not | |
1151 // discover references in other generations even if the | |
1152 // referent is in its own generation). This policy may, | |
1153 // in certain cases, enqueue references somewhat sooner than | |
1154 // might Policy #0 above, but at marginally increased cost | |
1155 // and complexity in processing these references. | |
1156 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1157 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1158 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1159 if (!_discovering_refs || !RegisterReferences) { |
1160 return false; | |
1161 } | |
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1162 // We only discover active references. |
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1163 oop next = java_lang_ref_Reference::next(obj); |
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1164 if (next != NULL) { // Ref is no longer active |
0 | 1165 return false; |
1166 } | |
1167 | |
1168 HeapWord* obj_addr = (HeapWord*)obj; | |
1169 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1170 !_span.contains(obj_addr)) { | |
1171 // Reference is not in the originating generation; | |
1172 // don't treat it specially (i.e. we want to scan it as a normal | |
1173 // object with strong references). | |
1174 return false; | |
1175 } | |
1176 | |
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1177 // We only discover references whose referents are not (yet) |
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1178 // known to be strongly reachable. |
0 | 1179 if (is_alive_non_header() != NULL) { |
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1180 verify_referent(obj); |
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1181 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1182 return false; // referent is reachable |
1183 } | |
1184 } | |
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1185 if (rt == REF_SOFT) { |
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1186 // For soft refs we can decide now if these are not |
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1187 // current candidates for clearing, in which case we |
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1188 // can mark through them now, rather than delaying that |
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1189 // to the reference-processing phase. Since all current |
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1190 // time-stamp policies advance the soft-ref clock only |
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1191 // at a major collection cycle, this is always currently |
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1192 // accurate. |
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1193 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
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1194 return false; |
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1195 } |
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1196 } |
0 | 1197 |
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1198 ResourceMark rm; // Needed for tracing. |
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1199 |
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1200 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1201 const oop discovered = java_lang_ref_Reference::discovered(obj); |
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1202 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1203 if (discovered != NULL) { |
0 | 1204 // The reference has already been discovered... |
1205 if (TraceReferenceGC) { | |
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1206 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1207 obj, obj->klass()->internal_name()); |
0 | 1208 } |
1209 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1210 // assumes that an object is not processed twice; | |
1211 // if it's been already discovered it must be on another | |
1212 // generation's discovered list; so we won't discover it. | |
1213 return false; | |
1214 } else { | |
1215 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1216 "Unrecognized policy"); | |
1217 // Check assumption that an object is not potentially | |
1218 // discovered twice except by concurrent collectors that potentially | |
1219 // trace the same Reference object twice. | |
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1220 assert(UseConcMarkSweepGC || UseG1GC, |
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1221 "Only possible with a concurrent marking collector"); |
0 | 1222 return true; |
1223 } | |
1224 } | |
1225 | |
1226 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1227 verify_referent(obj); |
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1228 // Discover if and only if EITHER: |
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1229 // .. reference is in our span, OR |
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1230 // .. we are an atomic collector and referent is in our span |
0 | 1231 if (_span.contains(obj_addr) || |
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1232 (discovery_is_atomic() && |
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1233 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1234 // should_enqueue = true; |
1235 } else { | |
1236 return false; | |
1237 } | |
1238 } else { | |
1239 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1240 _span.contains(obj_addr), "code inconsistency"); | |
1241 } | |
1242 | |
1243 // Get the right type of discovered queue head. | |
1244 DiscoveredList* list = get_discovered_list(rt); | |
1245 if (list == NULL) { | |
1246 return false; // nothing special needs to be done | |
1247 } | |
1248 | |
1249 if (_discovery_is_mt) { | |
1250 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1251 } else { | |
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1252 // If "_discovered_list_needs_barrier", we do write barriers when |
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1253 // updating the discovered reference list. Otherwise, we do a raw store |
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1254 // here: the field will be visited later when processing the discovered |
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1255 // references. |
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1256 oop current_head = list->head(); |
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1257 // The last ref must have its discovered field pointing to itself. |
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1258 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1259 |
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1260 // As in the case further above, since we are over-writing a NULL |
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1261 // pre-value, we can safely elide the pre-barrier here for the case of G1. |
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1262 // e.g.:- _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1263 assert(discovered == NULL, "control point invariant"); |
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1264 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1265 "For non-G1 collector, may need a pre-write-barrier for CAS from NULL below"); |
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1266 oop_store_raw(discovered_addr, next_discovered); |
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1267 if (_discovered_list_needs_barrier) { |
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1268 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1269 } |
0 | 1270 list->set_head(obj); |
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1271 list->inc_length(1); |
0 | 1272 |
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1273 if (TraceReferenceGC) { |
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1274 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1275 obj, obj->klass()->internal_name()); |
0 | 1276 } |
1277 } | |
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1278 assert(obj->is_oop(), "Discovered a bad reference"); |
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1279 verify_referent(obj); |
0 | 1280 return true; |
1281 } | |
1282 | |
1283 // Preclean the discovered references by removing those | |
1284 // whose referents are alive, and by marking from those that | |
1285 // are not active. These lists can be handled here | |
1286 // in any order and, indeed, concurrently. | |
1287 void ReferenceProcessor::preclean_discovered_references( | |
1288 BoolObjectClosure* is_alive, | |
1289 OopClosure* keep_alive, | |
1290 VoidClosure* complete_gc, | |
10405 | 1291 YieldClosure* yield, |
1292 GCTimer* gc_timer) { | |
0 | 1293 |
1294 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1295 | |
1296 // Soft references | |
1297 { | |
10405 | 1298 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
1299 false, gc_timer); | |
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1300 for (uint i = 0; i < _max_num_q; i++) { |
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1301 if (yield->should_return()) { |
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1302 return; |
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1303 } |
0 | 1304 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1305 keep_alive, complete_gc, yield); | |
1306 } | |
1307 } | |
1308 | |
1309 // Weak references | |
1310 { | |
10405 | 1311 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
1312 false, gc_timer); | |
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1313 for (uint i = 0; i < _max_num_q; i++) { |
452
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1314 if (yield->should_return()) { |
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1315 return; |
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1316 } |
0 | 1317 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1318 keep_alive, complete_gc, yield); | |
1319 } | |
1320 } | |
1321 | |
1322 // Final references | |
1323 { | |
10405 | 1324 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
1325 false, gc_timer); | |
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1326 for (uint i = 0; i < _max_num_q; i++) { |
452
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1327 if (yield->should_return()) { |
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1328 return; |
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1329 } |
0 | 1330 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1331 keep_alive, complete_gc, yield); | |
1332 } | |
1333 } | |
1334 | |
1335 // Phantom references | |
1336 { | |
10405 | 1337 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
1338 false, gc_timer); | |
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1339 for (uint i = 0; i < _max_num_q; i++) { |
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1340 if (yield->should_return()) { |
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1341 return; |
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1342 } |
0 | 1343 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1344 keep_alive, complete_gc, yield); | |
1345 } | |
1346 } | |
1347 } | |
1348 | |
1349 // Walk the given discovered ref list, and remove all reference objects | |
1350 // whose referents are still alive, whose referents are NULL or which | |
452
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1351 // are not active (have a non-NULL next field). NOTE: When we are |
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1352 // thus precleaning the ref lists (which happens single-threaded today), |
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1353 // we do not disable refs discovery to honour the correct semantics of |
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1354 // java.lang.Reference. As a result, we need to be careful below |
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1355 // that ref removal steps interleave safely with ref discovery steps |
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1356 // (in this thread). |
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1357 void |
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1358 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1359 BoolObjectClosure* is_alive, |
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1360 OopClosure* keep_alive, |
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1361 VoidClosure* complete_gc, |
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1362 YieldClosure* yield) { |
0 | 1363 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1364 while (iter.has_next()) { | |
1365 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1366 oop obj = iter.obj(); |
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1367 oop next = java_lang_ref_Reference::next(obj); |
0 | 1368 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1369 next != NULL) { |
0 | 1370 // The referent has been cleared, or is alive, or the Reference is not |
1371 // active; we need to trace and mark its cohort. | |
1372 if (TraceReferenceGC) { | |
1373 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1374 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1375 } |
1376 // Remove Reference object from list | |
1377 iter.remove(); | |
1378 // Keep alive its cohort. | |
1379 iter.make_referent_alive(); | |
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1380 if (UseCompressedOops) { |
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1381 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1382 keep_alive->do_oop(next_addr); |
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1383 } else { |
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1384 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1385 keep_alive->do_oop(next_addr); |
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1386 } |
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1387 iter.move_to_next(); |
0 | 1388 } else { |
1389 iter.next(); | |
1390 } | |
1391 } | |
1392 // Close the reachable set | |
1393 complete_gc->do_void(); | |
1394 | |
1395 NOT_PRODUCT( | |
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1396 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1397 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1398 "Refs in discovered list " INTPTR_FORMAT, |
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1399 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1400 } |
1401 ) | |
1402 } | |
1403 | |
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1404 const char* ReferenceProcessor::list_name(uint i) { |
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1405 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1406 "Out of bounds index"); |
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1407 |
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1408 int j = i / _max_num_q; |
0 | 1409 switch (j) { |
1410 case 0: return "SoftRef"; | |
1411 case 1: return "WeakRef"; | |
1412 case 2: return "FinalRef"; | |
1413 case 3: return "PhantomRef"; | |
1414 } | |
1415 ShouldNotReachHere(); | |
1416 return NULL; | |
1417 } | |
1418 | |
1419 #ifndef PRODUCT | |
1420 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1421 // empty for now | |
1422 } | |
1423 #endif | |
1424 | |
1425 #ifndef PRODUCT | |
1426 void ReferenceProcessor::clear_discovered_references() { | |
1427 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1428 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1429 clear_discovered_references(_discovered_refs[i]); |
0 | 1430 } |
1431 } | |
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1432 |
0 | 1433 #endif // PRODUCT |