Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 14247:2e96b2d61686
8031530: [TESTBUG] Enable test runtime/LoadClass/LoadClassNegative.java
Summary: Re-enabled the test. The issue that prevents this test from running was fixed by 8020675
Reviewed-by: sla, ccheung
author | zgu |
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date | Mon, 13 Jan 2014 10:05:37 -0500 |
parents | 190899198332 |
children | cefad50507d8 fbc1677398c0 |
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 |
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309 template <class T> |
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310 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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311 AbstractRefProcTaskExecutor* task_executor) { |
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312 |
0 | 313 // Remember old value of pending references list |
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314 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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315 T old_pending_list_value = *pending_list_addr; |
0 | 316 |
317 // Enqueue references that are not made active again, and | |
318 // clear the decks for the next collection (cycle). | |
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319 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
0 | 320 // Do the oop-check on pending_list_addr missed in |
321 // enqueue_discovered_reflist. We should probably | |
322 // do a raw oop_check so that future such idempotent | |
323 // oop_stores relying on the oop-check side-effect | |
324 // may be elided automatically and safely without | |
325 // affecting correctness. | |
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326 oop_store(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 327 |
328 // Stop treating discovered references specially. | |
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329 ref->disable_discovery(); |
0 | 330 |
331 // Return true if new pending references were added | |
332 return old_pending_list_value != *pending_list_addr; | |
333 } | |
334 | |
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335 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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336 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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337 if (UseCompressedOops) { |
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338 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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339 } else { |
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340 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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341 } |
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342 } |
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343 |
0 | 344 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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345 HeapWord* pending_list_addr) { |
0 | 346 // Given a list of refs linked through the "discovered" field |
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347 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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348 // thus distinguishing them from active References, then |
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349 // prepend them to the pending list. |
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350 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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351 // the "next" field is used to chain the pending list, not the discovered |
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352 // field. |
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353 |
0 | 354 if (TraceReferenceGC && PrintGCDetails) { |
355 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
356 INTPTR_FORMAT, (address)refs_list.head()); | |
357 } | |
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358 |
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359 oop obj = NULL; |
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360 oop next_d = refs_list.head(); |
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361 if (pending_list_uses_discovered_field()) { // New behaviour |
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362 // Walk down the list, self-looping the next field |
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363 // so that the References are not considered active. |
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364 while (obj != next_d) { |
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365 obj = next_d; |
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366 assert(obj->is_instanceRef(), "should be reference object"); |
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367 next_d = java_lang_ref_Reference::discovered(obj); |
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368 if (TraceReferenceGC && PrintGCDetails) { |
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369 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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370 (void *)obj, (void *)next_d); |
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371 } |
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372 assert(java_lang_ref_Reference::next(obj) == NULL, |
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373 "Reference not active; should not be discovered"); |
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374 // Self-loop next, so as to make Ref not active. |
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375 java_lang_ref_Reference::set_next(obj, obj); |
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376 if (next_d == obj) { // obj is last |
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377 // Swap refs_list into pendling_list_addr and |
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378 // set obj's discovered to what we read from pending_list_addr. |
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379 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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380 // Need oop_check on pending_list_addr above; |
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381 // see special oop-check code at the end of |
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382 // enqueue_discovered_reflists() further below. |
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383 java_lang_ref_Reference::set_discovered(obj, old); // old may be NULL |
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384 } |
0 | 385 } |
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386 } else { // Old behaviour |
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387 // Walk down the list, copying the discovered field into |
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388 // the next field and clearing the discovered field. |
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389 while (obj != next_d) { |
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390 obj = next_d; |
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391 assert(obj->is_instanceRef(), "should be reference object"); |
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392 next_d = java_lang_ref_Reference::discovered(obj); |
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393 if (TraceReferenceGC && PrintGCDetails) { |
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394 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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395 (void *)obj, (void *)next_d); |
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396 } |
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397 assert(java_lang_ref_Reference::next(obj) == NULL, |
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398 "The reference should not be enqueued"); |
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399 if (next_d == obj) { // obj is last |
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400 // Swap refs_list into pendling_list_addr and |
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401 // set obj's next to what we read from pending_list_addr. |
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402 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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403 // Need oop_check on pending_list_addr above; |
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404 // see special oop-check code at the end of |
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405 // enqueue_discovered_reflists() further below. |
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406 if (old == NULL) { |
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407 // obj should be made to point to itself, since |
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408 // pending list was empty. |
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409 java_lang_ref_Reference::set_next(obj, obj); |
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410 } else { |
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411 java_lang_ref_Reference::set_next(obj, old); |
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412 } |
0 | 413 } else { |
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414 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 415 } |
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416 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 417 } |
418 } | |
419 } | |
420 | |
421 // Parallel enqueue task | |
422 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
423 public: | |
424 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
425 DiscoveredList discovered_refs[], | |
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426 HeapWord* pending_list_addr, |
0 | 427 int n_queues) |
428 : EnqueueTask(ref_processor, discovered_refs, | |
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429 pending_list_addr, n_queues) |
0 | 430 { } |
431 | |
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432 virtual void work(unsigned int work_id) { |
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433 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 434 // Simplest first cut: static partitioning. |
435 int index = work_id; | |
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436 // The increment on "index" must correspond to the maximum number of queues |
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437 // (n_queues) with which that ReferenceProcessor was created. That |
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438 // is because of the "clever" way the discovered references lists were |
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439 // allocated and are indexed into. |
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440 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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441 for (int j = 0; |
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442 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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443 j++, index += _n_queues) { |
0 | 444 _ref_processor.enqueue_discovered_reflist( |
445 _refs_lists[index], _pending_list_addr); | |
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446 _refs_lists[index].set_head(NULL); |
0 | 447 _refs_lists[index].set_length(0); |
448 } | |
449 } | |
450 }; | |
451 | |
452 // Enqueue references that are not made active again | |
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453 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 454 AbstractRefProcTaskExecutor* task_executor) { |
455 if (_processing_is_mt && task_executor != NULL) { | |
456 // Parallel code | |
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457 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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458 pending_list_addr, _max_num_q); |
0 | 459 task_executor->execute(tsk); |
460 } else { | |
461 // Serial code: call the parent class's implementation | |
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462 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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463 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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464 _discovered_refs[i].set_head(NULL); |
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465 _discovered_refs[i].set_length(0); |
0 | 466 } |
467 } | |
468 } | |
469 | |
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470 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 471 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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472 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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473 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 474 "discovered field is bad"); |
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475 _next = discovered; |
0 | 476 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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477 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 478 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
479 "Wrong oop found in java.lang.Reference object"); | |
480 assert(allow_null_referent ? | |
481 _referent->is_oop_or_null() | |
482 : _referent->is_oop(), | |
483 "bad referent"); | |
484 } | |
485 | |
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486 void DiscoveredListIterator::remove() { |
0 | 487 assert(_ref->is_oop(), "Dropping a bad reference"); |
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488 oop_store_raw(_discovered_addr, NULL); |
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489 |
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490 // First _prev_next ref actually points into DiscoveredList (gross). |
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491 oop new_next; |
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492 if (_next == _ref) { |
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493 // At the end of the list, we should make _prev point to itself. |
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494 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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495 // and _prev will be NULL. |
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496 new_next = _prev; |
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497 } else { |
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498 new_next = _next; |
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499 } |
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500 |
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501 if (UseCompressedOops) { |
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502 // Remove Reference object from list. |
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503 oopDesc::encode_store_heap_oop((narrowOop*)_prev_next, new_next); |
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504 } else { |
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505 // Remove Reference object from list. |
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506 oopDesc::store_heap_oop((oop*)_prev_next, new_next); |
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507 } |
0 | 508 NOT_PRODUCT(_removed++); |
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509 _refs_list.dec_length(1); |
0 | 510 } |
511 | |
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512 // Make the Reference object active again. |
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513 void DiscoveredListIterator::make_active() { |
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514 // For G1 we don't want to use set_next - it |
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515 // will dirty the card for the next field of |
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516 // the reference object and will fail |
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517 // CT verification. |
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518 if (UseG1GC) { |
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519 BarrierSet* bs = oopDesc::bs(); |
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520 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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521 |
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522 if (UseCompressedOops) { |
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523 bs->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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524 } else { |
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525 bs->write_ref_field_pre((oop*)next_addr, NULL); |
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526 } |
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527 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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528 } else { |
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529 java_lang_ref_Reference::set_next(_ref, NULL); |
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530 } |
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531 } |
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532 |
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533 void DiscoveredListIterator::clear_referent() { |
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534 oop_store_raw(_referent_addr, NULL); |
0 | 535 } |
536 | |
537 // NOTE: process_phase*() are largely similar, and at a high level | |
538 // merely iterate over the extant list applying a predicate to | |
539 // each of its elements and possibly removing that element from the | |
540 // list and applying some further closures to that element. | |
541 // We should consider the possibility of replacing these | |
542 // process_phase*() methods by abstracting them into | |
543 // a single general iterator invocation that receives appropriate | |
544 // closures that accomplish this work. | |
545 | |
546 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
547 // referents are not alive, but that should be kept alive for policy reasons. | |
548 // Keep alive the transitive closure of all such referents. | |
549 void | |
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550 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 551 ReferencePolicy* policy, |
552 BoolObjectClosure* is_alive, | |
553 OopClosure* keep_alive, | |
554 VoidClosure* complete_gc) { | |
555 assert(policy != NULL, "Must have a non-NULL policy"); | |
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556 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 557 // Decide which softly reachable refs should be kept alive. |
558 while (iter.has_next()) { | |
559 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
560 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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561 if (referent_is_dead && |
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562 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 563 if (TraceReferenceGC) { |
564 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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565 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 566 } |
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567 // Remove Reference object from list |
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568 iter.remove(); |
0 | 569 // Make the Reference object active again |
570 iter.make_active(); | |
571 // keep the referent around | |
572 iter.make_referent_alive(); | |
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573 iter.move_to_next(); |
0 | 574 } else { |
575 iter.next(); | |
576 } | |
577 } | |
578 // Close the reachable set | |
579 complete_gc->do_void(); | |
580 NOT_PRODUCT( | |
581 if (PrintGCDetails && TraceReferenceGC) { | |
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582 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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583 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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584 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 585 } |
586 ) | |
587 } | |
588 | |
589 // Traverse the list and remove any Refs that are not active, or | |
590 // whose referents are either alive or NULL. | |
591 void | |
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592 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 593 BoolObjectClosure* is_alive, |
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594 OopClosure* keep_alive) { |
0 | 595 assert(discovery_is_atomic(), "Error"); |
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596 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 597 while (iter.has_next()) { |
598 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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599 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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600 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 601 if (iter.is_referent_alive()) { |
602 if (TraceReferenceGC) { | |
603 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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604 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 605 } |
606 // The referent is reachable after all. | |
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607 // Remove Reference object from list. |
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608 iter.remove(); |
0 | 609 // Update the referent pointer as necessary: Note that this |
610 // should not entail any recursive marking because the | |
611 // referent must already have been traversed. | |
612 iter.make_referent_alive(); | |
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613 iter.move_to_next(); |
0 | 614 } else { |
615 iter.next(); | |
616 } | |
617 } | |
618 NOT_PRODUCT( | |
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619 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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620 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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621 "Refs in discovered list " INTPTR_FORMAT, |
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622 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 623 } |
624 ) | |
625 } | |
626 | |
627 void | |
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628 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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629 BoolObjectClosure* is_alive, |
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630 OopClosure* keep_alive, |
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631 VoidClosure* complete_gc) { |
0 | 632 assert(!discovery_is_atomic(), "Error"); |
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633 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 634 while (iter.has_next()) { |
635 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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636 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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637 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 638 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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639 next != NULL)) { |
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640 assert(next->is_oop_or_null(), "bad next field"); |
0 | 641 // Remove Reference object from list |
642 iter.remove(); | |
643 // Trace the cohorts | |
644 iter.make_referent_alive(); | |
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645 if (UseCompressedOops) { |
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646 keep_alive->do_oop((narrowOop*)next_addr); |
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647 } else { |
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648 keep_alive->do_oop((oop*)next_addr); |
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649 } |
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650 iter.move_to_next(); |
0 | 651 } else { |
652 iter.next(); | |
653 } | |
654 } | |
655 // Now close the newly reachable set | |
656 complete_gc->do_void(); | |
657 NOT_PRODUCT( | |
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658 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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659 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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660 "Refs in discovered list " INTPTR_FORMAT, |
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661 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 662 } |
663 ) | |
664 } | |
665 | |
666 // Traverse the list and process the referents, by either | |
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667 // clearing them or keeping them (and their reachable |
0 | 668 // closure) alive. |
669 void | |
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670 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 671 bool clear_referent, |
672 BoolObjectClosure* is_alive, | |
673 OopClosure* keep_alive, | |
674 VoidClosure* complete_gc) { | |
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675 ResourceMark rm; |
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676 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 677 while (iter.has_next()) { |
678 iter.update_discovered(); | |
679 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
680 if (clear_referent) { | |
681 // NULL out referent pointer | |
682 iter.clear_referent(); | |
683 } else { | |
684 // keep the referent around | |
685 iter.make_referent_alive(); | |
686 } | |
687 if (TraceReferenceGC) { | |
688 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
689 clear_referent ? "cleared " : "", | |
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690 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 691 } |
692 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
693 iter.next(); | |
694 } | |
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695 // Remember to update the next pointer of the last ref. |
0 | 696 iter.update_discovered(); |
697 // Close the reachable set | |
698 complete_gc->do_void(); | |
699 } | |
700 | |
701 void | |
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702 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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703 oop obj = NULL; |
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704 oop next = refs_list.head(); |
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705 while (next != obj) { |
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706 obj = next; |
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707 next = java_lang_ref_Reference::discovered(obj); |
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708 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 709 } |
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710 refs_list.set_head(NULL); |
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711 refs_list.set_length(0); |
0 | 712 } |
713 | |
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714 void |
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715 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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716 clear_discovered_references(refs_list); |
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717 } |
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718 |
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719 void ReferenceProcessor::abandon_partial_discovery() { |
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720 // loop over the lists |
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721 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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722 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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723 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
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724 } |
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725 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 726 } |
727 } | |
728 | |
729 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
730 public: | |
731 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
732 DiscoveredList refs_lists[], | |
733 ReferencePolicy* policy, | |
734 bool marks_oops_alive) | |
735 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
736 _policy(policy) | |
737 { } | |
738 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
739 OopClosure& keep_alive, | |
740 VoidClosure& complete_gc) | |
741 { | |
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742 Thread* thr = Thread::current(); |
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743 int refs_list_index = ((WorkerThread*)thr)->id(); |
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744 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 745 &is_alive, &keep_alive, &complete_gc); |
746 } | |
747 private: | |
748 ReferencePolicy* _policy; | |
749 }; | |
750 | |
751 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
752 public: | |
753 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
754 DiscoveredList refs_lists[], | |
755 bool marks_oops_alive) | |
756 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
757 { } | |
758 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
759 OopClosure& keep_alive, | |
760 VoidClosure& complete_gc) | |
761 { | |
762 _ref_processor.process_phase2(_refs_lists[i], | |
763 &is_alive, &keep_alive, &complete_gc); | |
764 } | |
765 }; | |
766 | |
767 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
768 public: | |
769 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
770 DiscoveredList refs_lists[], | |
771 bool clear_referent, | |
772 bool marks_oops_alive) | |
773 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
774 _clear_referent(clear_referent) | |
775 { } | |
776 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
777 OopClosure& keep_alive, | |
778 VoidClosure& complete_gc) | |
779 { | |
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780 // Don't use "refs_list_index" calculated in this way because |
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781 // balance_queues() has moved the Ref's into the first n queues. |
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782 // Thread* thr = Thread::current(); |
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783 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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784 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 785 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
786 &is_alive, &keep_alive, &complete_gc); | |
787 } | |
788 private: | |
789 bool _clear_referent; | |
790 }; | |
791 | |
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792 void ReferenceProcessor::set_discovered(oop ref, oop value) { |
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793 if (_discovered_list_needs_barrier) { |
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794 java_lang_ref_Reference::set_discovered(ref, value); |
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795 } else { |
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796 java_lang_ref_Reference::set_discovered_raw(ref, value); |
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797 } |
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798 } |
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799 |
0 | 800 // Balances reference queues. |
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801 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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802 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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803 // corresponding to the active workers will be processed. |
0 | 804 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
805 { | |
806 // calculate total length | |
807 size_t total_refs = 0; | |
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808 if (TraceReferenceGC && PrintGCDetails) { |
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809 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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810 } |
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811 |
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812 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 813 total_refs += ref_lists[i].length(); |
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814 if (TraceReferenceGC && PrintGCDetails) { |
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815 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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816 } |
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817 } |
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818 if (TraceReferenceGC && PrintGCDetails) { |
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819 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 820 } |
821 size_t avg_refs = total_refs / _num_q + 1; | |
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822 uint to_idx = 0; |
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823 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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824 bool move_all = false; |
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825 if (from_idx >= _num_q) { |
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826 move_all = ref_lists[from_idx].length() > 0; |
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827 } |
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828 while ((ref_lists[from_idx].length() > avg_refs) || |
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829 move_all) { |
0 | 830 assert(to_idx < _num_q, "Sanity Check!"); |
831 if (ref_lists[to_idx].length() < avg_refs) { | |
832 // move superfluous refs | |
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833 size_t refs_to_move; |
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834 // Move all the Ref's if the from queue will not be processed. |
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835 if (move_all) { |
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836 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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837 avg_refs - ref_lists[to_idx].length()); |
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838 } else { |
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839 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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840 avg_refs - ref_lists[to_idx].length()); |
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841 } |
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842 |
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843 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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844 |
0 | 845 oop move_head = ref_lists[from_idx].head(); |
846 oop move_tail = move_head; | |
847 oop new_head = move_head; | |
848 // find an element to split the list on | |
849 for (size_t j = 0; j < refs_to_move; ++j) { | |
850 move_tail = new_head; | |
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851 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 852 } |
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853 |
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854 // Add the chain to the to list. |
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855 if (ref_lists[to_idx].head() == NULL) { |
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856 // to list is empty. Make a loop at the end. |
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857 set_discovered(move_tail, move_tail); |
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858 } else { |
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859 set_discovered(move_tail, ref_lists[to_idx].head()); |
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860 } |
0 | 861 ref_lists[to_idx].set_head(move_head); |
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862 ref_lists[to_idx].inc_length(refs_to_move); |
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863 |
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864 // Remove the chain from the from list. |
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865 if (move_tail == new_head) { |
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866 // We found the end of the from list. |
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867 ref_lists[from_idx].set_head(NULL); |
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868 } else { |
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869 ref_lists[from_idx].set_head(new_head); |
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870 } |
452
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871 ref_lists[from_idx].dec_length(refs_to_move); |
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872 if (ref_lists[from_idx].length() == 0) { |
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873 break; |
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874 } |
0 | 875 } else { |
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876 to_idx = (to_idx + 1) % _num_q; |
0 | 877 } |
878 } | |
879 } | |
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880 #ifdef ASSERT |
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881 size_t balanced_total_refs = 0; |
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882 for (uint i = 0; i < _max_num_q; ++i) { |
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883 balanced_total_refs += ref_lists[i].length(); |
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884 if (TraceReferenceGC && PrintGCDetails) { |
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885 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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886 } |
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887 } |
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888 if (TraceReferenceGC && PrintGCDetails) { |
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889 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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890 gclog_or_tty->flush(); |
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891 } |
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892 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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893 #endif |
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894 } |
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895 |
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896 void ReferenceProcessor::balance_all_queues() { |
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897 balance_queues(_discoveredSoftRefs); |
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898 balance_queues(_discoveredWeakRefs); |
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899 balance_queues(_discoveredFinalRefs); |
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900 balance_queues(_discoveredPhantomRefs); |
0 | 901 } |
902 | |
10405 | 903 size_t |
0 | 904 ReferenceProcessor::process_discovered_reflist( |
905 DiscoveredList refs_lists[], | |
906 ReferencePolicy* policy, | |
907 bool clear_referent, | |
908 BoolObjectClosure* is_alive, | |
909 OopClosure* keep_alive, | |
910 VoidClosure* complete_gc, | |
911 AbstractRefProcTaskExecutor* task_executor) | |
912 { | |
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913 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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914 // If discovery used MT and a dynamic number of GC threads, then |
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915 // the queues must be balanced for correctness if fewer than the |
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916 // maximum number of queues were used. The number of queue used |
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917 // during discovery may be different than the number to be used |
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918 // for processing so don't depend of _num_q < _max_num_q as part |
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919 // of the test. |
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920 bool must_balance = _discovery_is_mt; |
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921 |
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922 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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923 must_balance) { |
0 | 924 balance_queues(refs_lists); |
925 } | |
10405 | 926 |
927 size_t total_list_count = total_count(refs_lists); | |
928 | |
0 | 929 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 930 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 931 } |
932 | |
933 // Phase 1 (soft refs only): | |
934 // . Traverse the list and remove any SoftReferences whose | |
935 // referents are not alive, but that should be kept alive for | |
936 // policy reasons. Keep alive the transitive closure of all | |
937 // such referents. | |
938 if (policy != NULL) { | |
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939 if (mt_processing) { |
0 | 940 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
941 task_executor->execute(phase1); | |
942 } else { | |
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943 for (uint i = 0; i < _max_num_q; i++) { |
0 | 944 process_phase1(refs_lists[i], policy, |
945 is_alive, keep_alive, complete_gc); | |
946 } | |
947 } | |
948 } else { // policy == NULL | |
949 assert(refs_lists != _discoveredSoftRefs, | |
950 "Policy must be specified for soft references."); | |
951 } | |
952 | |
953 // Phase 2: | |
954 // . Traverse the list and remove any refs whose referents are alive. | |
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955 if (mt_processing) { |
0 | 956 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
957 task_executor->execute(phase2); | |
958 } else { | |
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959 for (uint i = 0; i < _max_num_q; i++) { |
0 | 960 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
961 } | |
962 } | |
963 | |
964 // Phase 3: | |
965 // . Traverse the list and process referents as appropriate. | |
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966 if (mt_processing) { |
0 | 967 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
968 task_executor->execute(phase3); | |
969 } else { | |
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970 for (uint i = 0; i < _max_num_q; i++) { |
0 | 971 process_phase3(refs_lists[i], clear_referent, |
972 is_alive, keep_alive, complete_gc); | |
973 } | |
974 } | |
10405 | 975 |
976 return total_list_count; | |
0 | 977 } |
978 | |
979 void ReferenceProcessor::clean_up_discovered_references() { | |
980 // loop over the lists | |
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981 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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982 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 983 gclog_or_tty->print_cr( |
984 "\nScrubbing %s discovered list of Null referents", | |
985 list_name(i)); | |
986 } | |
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987 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 988 } |
989 } | |
990 | |
991 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
992 assert(!discovery_is_atomic(), "Else why call this method?"); | |
993 DiscoveredListIterator iter(refs_list, NULL, NULL); | |
994 while (iter.has_next()) { | |
995 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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996 oop next = java_lang_ref_Reference::next(iter.obj()); |
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997 assert(next->is_oop_or_null(), "bad next field"); |
0 | 998 // If referent has been cleared or Reference is not active, |
999 // drop it. | |
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1000 if (iter.referent() == NULL || next != NULL) { |
0 | 1001 debug_only( |
1002 if (PrintGCDetails && TraceReferenceGC) { | |
1003 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
1004 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
1005 " and referent: " INTPTR_FORMAT, | |
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1006 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 1007 } |
1008 ) | |
1009 // Remove Reference object from list | |
1010 iter.remove(); | |
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1011 iter.move_to_next(); |
0 | 1012 } else { |
1013 iter.next(); | |
1014 } | |
1015 } | |
1016 NOT_PRODUCT( | |
1017 if (PrintGCDetails && TraceReferenceGC) { | |
1018 gclog_or_tty->print( | |
1019 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1020 iter.removed(), iter.processed()); | |
1021 } | |
1022 ) | |
1023 } | |
1024 | |
1025 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1026 uint id = 0; |
0 | 1027 // Determine the queue index to use for this object. |
1028 if (_discovery_is_mt) { | |
1029 // During a multi-threaded discovery phase, | |
1030 // each thread saves to its "own" list. | |
1031 Thread* thr = Thread::current(); | |
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1032 id = thr->as_Worker_thread()->id(); |
0 | 1033 } else { |
1034 // single-threaded discovery, we save in round-robin | |
1035 // fashion to each of the lists. | |
1036 if (_processing_is_mt) { | |
1037 id = next_id(); | |
1038 } | |
1039 } | |
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1040 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1041 |
1042 // Get the discovered queue to which we will add | |
1043 DiscoveredList* list = NULL; | |
1044 switch (rt) { | |
1045 case REF_OTHER: | |
1046 // Unknown reference type, no special treatment | |
1047 break; | |
1048 case REF_SOFT: | |
1049 list = &_discoveredSoftRefs[id]; | |
1050 break; | |
1051 case REF_WEAK: | |
1052 list = &_discoveredWeakRefs[id]; | |
1053 break; | |
1054 case REF_FINAL: | |
1055 list = &_discoveredFinalRefs[id]; | |
1056 break; | |
1057 case REF_PHANTOM: | |
1058 list = &_discoveredPhantomRefs[id]; | |
1059 break; | |
1060 case REF_NONE: | |
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1061 // we should not reach here if we are an InstanceRefKlass |
0 | 1062 default: |
1063 ShouldNotReachHere(); | |
1064 } | |
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1065 if (TraceReferenceGC && PrintGCDetails) { |
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1066 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1067 } |
0 | 1068 return list; |
1069 } | |
1070 | |
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1071 inline void |
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1072 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1073 oop obj, |
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1074 HeapWord* discovered_addr) { |
0 | 1075 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1076 // First we must make sure this object is only enqueued once. CAS in a non null | |
1077 // discovered_addr. | |
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1078 oop current_head = refs_list.head(); |
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1079 // The last ref must have its discovered field pointing to itself. |
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1080 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1081 |
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1082 // Note: In the case of G1, this specific pre-barrier is strictly |
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1083 // not necessary because the only case we are interested in |
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1084 // here is when *discovered_addr is NULL (see the CAS further below), |
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1085 // so this will expand to nothing. As a result, we have manually |
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1086 // elided this out for G1, but left in the test for some future |
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1087 // collector that might have need for a pre-barrier here, e.g.:- |
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1088 // _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1089 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1090 "Need to check non-G1 collector: " |
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1091 "may need a pre-write-barrier for CAS from NULL below"); |
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1092 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1093 NULL); |
0 | 1094 if (retest == NULL) { |
1095 // This thread just won the right to enqueue the object. | |
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1096 // We have separate lists for enqueueing, so no synchronization |
0 | 1097 // is necessary. |
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1098 refs_list.set_head(obj); |
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1099 refs_list.inc_length(1); |
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1100 if (_discovered_list_needs_barrier) { |
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1101 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1102 } |
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1103 |
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1104 if (TraceReferenceGC) { |
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1105 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1106 (void *)obj, obj->klass()->internal_name()); |
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1107 } |
0 | 1108 } else { |
1109 // If retest was non NULL, another thread beat us to it: | |
1110 // The reference has already been discovered... | |
1111 if (TraceReferenceGC) { | |
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1112 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1113 (void *)obj, obj->klass()->internal_name()); |
0 | 1114 } |
1115 } | |
1116 } | |
1117 | |
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1118 #ifndef PRODUCT |
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1119 // Non-atomic (i.e. concurrent) discovery might allow us |
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1120 // to observe j.l.References with NULL referents, being those |
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1121 // cleared concurrently by mutators during (or after) discovery. |
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1122 void ReferenceProcessor::verify_referent(oop obj) { |
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1123 bool da = discovery_is_atomic(); |
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1124 oop referent = java_lang_ref_Reference::referent(obj); |
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1125 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1126 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1127 INTPTR_FORMAT " during %satomic discovery ", |
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1128 (void *)referent, (void *)obj, da ? "" : "non-")); |
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1129 } |
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1130 #endif |
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1131 |
0 | 1132 // We mention two of several possible choices here: |
1133 // #0: if the reference object is not in the "originating generation" | |
1134 // (or part of the heap being collected, indicated by our "span" | |
1135 // we don't treat it specially (i.e. we scan it as we would | |
1136 // a normal oop, treating its references as strong references). | |
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1137 // This means that references can't be discovered unless their |
0 | 1138 // referent is also in the same span. This is the simplest, |
1139 // most "local" and most conservative approach, albeit one | |
1140 // that may cause weak references to be enqueued least promptly. | |
1141 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1142 // #1: the reference object may be in any generation (span), but if | |
1143 // the referent is in the generation (span) being currently collected | |
1144 // then we can discover the reference object, provided | |
1145 // the object has not already been discovered by | |
1146 // a different concurrently running collector (as may be the | |
1147 // case, for instance, if the reference object is in CMS and | |
1148 // the referent in DefNewGeneration), and provided the processing | |
1149 // of this reference object by the current collector will | |
1150 // appear atomic to every other collector in the system. | |
1151 // (Thus, for instance, a concurrent collector may not | |
1152 // discover references in other generations even if the | |
1153 // referent is in its own generation). This policy may, | |
1154 // in certain cases, enqueue references somewhat sooner than | |
1155 // might Policy #0 above, but at marginally increased cost | |
1156 // and complexity in processing these references. | |
1157 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1158 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1159 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1160 if (!_discovering_refs || !RegisterReferences) { |
1161 return false; | |
1162 } | |
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1163 // We only discover active references. |
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1164 oop next = java_lang_ref_Reference::next(obj); |
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1165 if (next != NULL) { // Ref is no longer active |
0 | 1166 return false; |
1167 } | |
1168 | |
1169 HeapWord* obj_addr = (HeapWord*)obj; | |
1170 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1171 !_span.contains(obj_addr)) { | |
1172 // Reference is not in the originating generation; | |
1173 // don't treat it specially (i.e. we want to scan it as a normal | |
1174 // object with strong references). | |
1175 return false; | |
1176 } | |
1177 | |
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1178 // We only discover references whose referents are not (yet) |
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1179 // known to be strongly reachable. |
0 | 1180 if (is_alive_non_header() != NULL) { |
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1181 verify_referent(obj); |
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1182 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1183 return false; // referent is reachable |
1184 } | |
1185 } | |
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1186 if (rt == REF_SOFT) { |
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1187 // For soft refs we can decide now if these are not |
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1188 // current candidates for clearing, in which case we |
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1189 // can mark through them now, rather than delaying that |
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1190 // to the reference-processing phase. Since all current |
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1191 // time-stamp policies advance the soft-ref clock only |
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1192 // at a major collection cycle, this is always currently |
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1193 // accurate. |
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1194 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
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1195 return false; |
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1196 } |
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1197 } |
0 | 1198 |
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1199 ResourceMark rm; // Needed for tracing. |
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1200 |
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1201 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1202 const oop discovered = java_lang_ref_Reference::discovered(obj); |
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1203 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1204 if (discovered != NULL) { |
0 | 1205 // The reference has already been discovered... |
1206 if (TraceReferenceGC) { | |
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1207 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1208 (void *)obj, obj->klass()->internal_name()); |
0 | 1209 } |
1210 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1211 // assumes that an object is not processed twice; | |
1212 // if it's been already discovered it must be on another | |
1213 // generation's discovered list; so we won't discover it. | |
1214 return false; | |
1215 } else { | |
1216 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1217 "Unrecognized policy"); | |
1218 // Check assumption that an object is not potentially | |
1219 // discovered twice except by concurrent collectors that potentially | |
1220 // trace the same Reference object twice. | |
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1221 assert(UseConcMarkSweepGC || UseG1GC, |
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1222 "Only possible with a concurrent marking collector"); |
0 | 1223 return true; |
1224 } | |
1225 } | |
1226 | |
1227 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1228 verify_referent(obj); |
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1229 // Discover if and only if EITHER: |
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1230 // .. reference is in our span, OR |
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1231 // .. we are an atomic collector and referent is in our span |
0 | 1232 if (_span.contains(obj_addr) || |
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1233 (discovery_is_atomic() && |
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1234 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1235 // should_enqueue = true; |
1236 } else { | |
1237 return false; | |
1238 } | |
1239 } else { | |
1240 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1241 _span.contains(obj_addr), "code inconsistency"); | |
1242 } | |
1243 | |
1244 // Get the right type of discovered queue head. | |
1245 DiscoveredList* list = get_discovered_list(rt); | |
1246 if (list == NULL) { | |
1247 return false; // nothing special needs to be done | |
1248 } | |
1249 | |
1250 if (_discovery_is_mt) { | |
1251 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1252 } else { | |
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1253 // If "_discovered_list_needs_barrier", we do write barriers when |
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1254 // updating the discovered reference list. Otherwise, we do a raw store |
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1255 // here: the field will be visited later when processing the discovered |
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1256 // references. |
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1257 oop current_head = list->head(); |
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1258 // The last ref must have its discovered field pointing to itself. |
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1259 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1260 |
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1261 // As in the case further above, since we are over-writing a NULL |
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1262 // pre-value, we can safely elide the pre-barrier here for the case of G1. |
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1263 // e.g.:- _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1264 assert(discovered == NULL, "control point invariant"); |
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1265 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1266 "For non-G1 collector, may need a pre-write-barrier for CAS from NULL below"); |
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1267 oop_store_raw(discovered_addr, next_discovered); |
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1268 if (_discovered_list_needs_barrier) { |
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1269 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1270 } |
0 | 1271 list->set_head(obj); |
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1272 list->inc_length(1); |
0 | 1273 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1972
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1274 if (TraceReferenceGC) { |
3917
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1275 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
12316
190899198332
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1276 (void *)obj, obj->klass()->internal_name()); |
0 | 1277 } |
1278 } | |
3917
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1279 assert(obj->is_oop(), "Discovered a bad reference"); |
1995
8df09fb45352
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
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1280 verify_referent(obj); |
0 | 1281 return true; |
1282 } | |
1283 | |
1284 // Preclean the discovered references by removing those | |
1285 // whose referents are alive, and by marking from those that | |
1286 // are not active. These lists can be handled here | |
1287 // in any order and, indeed, concurrently. | |
1288 void ReferenceProcessor::preclean_discovered_references( | |
1289 BoolObjectClosure* is_alive, | |
1290 OopClosure* keep_alive, | |
1291 VoidClosure* complete_gc, | |
10405 | 1292 YieldClosure* yield, |
1293 GCTimer* gc_timer) { | |
0 | 1294 |
1295 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1296 | |
1297 // Soft references | |
1298 { | |
10405 | 1299 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
1300 false, gc_timer); | |
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1301 for (uint i = 0; i < _max_num_q; i++) { |
452
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1302 if (yield->should_return()) { |
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1303 return; |
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1304 } |
0 | 1305 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1306 keep_alive, complete_gc, yield); | |
1307 } | |
1308 } | |
1309 | |
1310 // Weak references | |
1311 { | |
10405 | 1312 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
1313 false, gc_timer); | |
4728
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1314 for (uint i = 0; i < _max_num_q; i++) { |
452
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1315 if (yield->should_return()) { |
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1316 return; |
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1317 } |
0 | 1318 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1319 keep_alive, complete_gc, yield); | |
1320 } | |
1321 } | |
1322 | |
1323 // Final references | |
1324 { | |
10405 | 1325 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
1326 false, gc_timer); | |
4728
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7121618: Change type of number of GC workers to unsigned int.
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1327 for (uint i = 0; i < _max_num_q; i++) { |
452
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1328 if (yield->should_return()) { |
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1329 return; |
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1330 } |
0 | 1331 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1332 keep_alive, complete_gc, yield); | |
1333 } | |
1334 } | |
1335 | |
1336 // Phantom references | |
1337 { | |
10405 | 1338 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
1339 false, gc_timer); | |
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1340 for (uint i = 0; i < _max_num_q; i++) { |
452
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1341 if (yield->should_return()) { |
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1342 return; |
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1343 } |
0 | 1344 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1345 keep_alive, complete_gc, yield); | |
1346 } | |
1347 } | |
1348 } | |
1349 | |
1350 // Walk the given discovered ref list, and remove all reference objects | |
1351 // whose referents are still alive, whose referents are NULL or which | |
452
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1352 // are not active (have a non-NULL next field). NOTE: When we are |
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1353 // thus precleaning the ref lists (which happens single-threaded today), |
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1354 // we do not disable refs discovery to honour the correct semantics of |
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1355 // java.lang.Reference. As a result, we need to be careful below |
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1356 // that ref removal steps interleave safely with ref discovery steps |
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1357 // (in this thread). |
113
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1358 void |
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1359 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1360 BoolObjectClosure* is_alive, |
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1361 OopClosure* keep_alive, |
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1362 VoidClosure* complete_gc, |
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1363 YieldClosure* yield) { |
0 | 1364 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1365 while (iter.has_next()) { | |
1366 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
113
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1367 oop obj = iter.obj(); |
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1368 oop next = java_lang_ref_Reference::next(obj); |
0 | 1369 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1370 next != NULL) { |
0 | 1371 // The referent has been cleared, or is alive, or the Reference is not |
1372 // active; we need to trace and mark its cohort. | |
1373 if (TraceReferenceGC) { | |
1374 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
12316
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1375 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1376 } |
1377 // Remove Reference object from list | |
1378 iter.remove(); | |
1379 // Keep alive its cohort. | |
1380 iter.make_referent_alive(); | |
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1381 if (UseCompressedOops) { |
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1382 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1383 keep_alive->do_oop(next_addr); |
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1384 } else { |
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1385 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1386 keep_alive->do_oop(next_addr); |
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1387 } |
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1388 iter.move_to_next(); |
0 | 1389 } else { |
1390 iter.next(); | |
1391 } | |
1392 } | |
1393 // Close the reachable set | |
1394 complete_gc->do_void(); | |
1395 | |
1396 NOT_PRODUCT( | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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1397 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
1833
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6984287: Regularize how GC parallel workers are specified.
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1398 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
8b10f48633dc
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1399 "Refs in discovered list " INTPTR_FORMAT, |
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1400 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1401 } |
1402 ) | |
1403 } | |
1404 | |
4728
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|
1405 const char* ReferenceProcessor::list_name(uint i) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
1406 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
1407 "Out of bounds index"); |
4dfb2df418f2
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3917
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|
1408 |
1833
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|
1409 int j = i / _max_num_q; |
0 | 1410 switch (j) { |
1411 case 0: return "SoftRef"; | |
1412 case 1: return "WeakRef"; | |
1413 case 2: return "FinalRef"; | |
1414 case 3: return "PhantomRef"; | |
1415 } | |
1416 ShouldNotReachHere(); | |
1417 return NULL; | |
1418 } | |
1419 | |
1420 #ifndef PRODUCT | |
1421 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1422 // empty for now | |
1423 } | |
1424 #endif | |
1425 | |
1426 #ifndef PRODUCT | |
1427 void ReferenceProcessor::clear_discovered_references() { | |
1428 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1429 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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1430 clear_discovered_references(_discovered_refs[i]); |
0 | 1431 } |
1432 } | |
3915
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7085906: Replace the permgen allocated sentinelRef with a self-looped end
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1433 |
0 | 1434 #endif // PRODUCT |