Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Tue, 07 Apr 2015 14:58:49 +0200 |
parents | 52b4284cb496 c2844108a708 |
children | f01ebceea995 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
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40 ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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41 ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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42 bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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43 jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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44 |
0 | 45 void referenceProcessor_init() { |
46 ReferenceProcessor::init_statics(); | |
47 } | |
48 | |
49 void ReferenceProcessor::init_statics() { | |
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50 // We need a monotonically non-deccreasing time in ms but |
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51 // os::javaTimeMillis() does not guarantee monotonicity. |
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52 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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53 |
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54 // Initialize the soft ref timestamp clock. |
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55 _soft_ref_timestamp_clock = now; |
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56 // Also update the soft ref clock in j.l.r.SoftReference |
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57 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 58 |
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59 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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60 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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61 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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62 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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63 vm_exit_during_initialization("Could not allocate reference policy object"); |
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64 } |
0 | 65 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
66 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
67 "Unrecongnized RefDiscoveryPolicy"); | |
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68 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 69 } |
70 | |
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71 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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72 #ifdef ASSERT |
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73 // Verify that we're not currently discovering refs |
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74 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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75 |
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76 if (check_no_refs) { |
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77 // Verify that the discovered lists are empty |
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78 verify_no_references_recorded(); |
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79 } |
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80 #endif // ASSERT |
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81 |
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82 // Someone could have modified the value of the static |
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83 // field in the j.l.r.SoftReference class that holds the |
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84 // soft reference timestamp clock using reflection or |
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85 // Unsafe between GCs. Unconditionally update the static |
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86 // field in ReferenceProcessor here so that we use the new |
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87 // value during reference discovery. |
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88 |
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89 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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90 _discovering_refs = true; |
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91 } |
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92 |
0 | 93 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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94 bool mt_processing, |
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95 uint mt_processing_degree, |
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96 bool mt_discovery, |
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97 uint mt_discovery_degree, |
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98 bool atomic_discovery, |
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99 BoolObjectClosure* is_alive_non_header) : |
0 | 100 _discovering_refs(false), |
101 _enqueuing_is_done(false), | |
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102 _is_alive_non_header(is_alive_non_header), |
0 | 103 _processing_is_mt(mt_processing), |
104 _next_id(0) | |
105 { | |
106 _span = span; | |
107 _discovery_is_atomic = atomic_discovery; | |
108 _discovery_is_mt = mt_discovery; | |
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109 _num_q = MAX2(1U, mt_processing_degree); |
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110 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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111 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
6197 | 112 _max_num_q * number_of_subclasses_of_ref(), mtGC); |
113 | |
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114 if (_discovered_refs == NULL) { |
0 | 115 vm_exit_during_initialization("Could not allocated RefProc Array"); |
116 } | |
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117 _discoveredSoftRefs = &_discovered_refs[0]; |
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118 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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119 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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120 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
20755 | 121 _discoveredCleanerRefs = &_discoveredPhantomRefs[_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 setup_policy(false /* default soft ref policy */); |
0 | 130 } |
131 | |
132 #ifndef PRODUCT | |
133 void ReferenceProcessor::verify_no_references_recorded() { | |
134 guarantee(!_discovering_refs, "Discovering refs?"); | |
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135 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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136 guarantee(_discovered_refs[i].is_empty(), |
0 | 137 "Found non-empty discovered list"); |
138 } | |
139 } | |
140 #endif | |
141 | |
142 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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143 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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144 if (UseCompressedOops) { |
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145 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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146 } else { |
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147 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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148 } |
0 | 149 } |
150 } | |
151 | |
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152 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 153 // Update (advance) the soft ref master clock field. This must be done |
154 // after processing the soft ref list. | |
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155 |
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156 // We need a monotonically non-deccreasing time in ms but |
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157 // os::javaTimeMillis() does not guarantee monotonicity. |
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158 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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159 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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160 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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161 |
0 | 162 NOT_PRODUCT( |
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163 if (now < _soft_ref_timestamp_clock) { |
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164 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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165 _soft_ref_timestamp_clock, now); |
0 | 166 } |
167 ) | |
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168 // The values of now and _soft_ref_timestamp_clock are set using |
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169 // javaTimeNanos(), which is guaranteed to be monotonically |
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170 // non-decreasing provided the underlying platform provides such |
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171 // a time source (and it is bug free). |
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172 // In product mode, however, protect ourselves from non-monotonicty. |
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173 if (now > _soft_ref_timestamp_clock) { |
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174 _soft_ref_timestamp_clock = now; |
0 | 175 java_lang_ref_SoftReference::set_clock(now); |
176 } | |
177 // Else leave clock stalled at its old value until time progresses | |
178 // past clock value. | |
179 } | |
180 | |
10405 | 181 size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
182 size_t total = 0; | |
183 for (uint i = 0; i < _max_num_q; ++i) { | |
184 total += lists[i].length(); | |
185 } | |
186 return total; | |
187 } | |
188 | |
189 ReferenceProcessorStats ReferenceProcessor::process_discovered_references( | |
0 | 190 BoolObjectClosure* is_alive, |
191 OopClosure* keep_alive, | |
192 VoidClosure* complete_gc, | |
10405 | 193 AbstractRefProcTaskExecutor* task_executor, |
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194 GCTimer* gc_timer, |
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195 GCId gc_id) { |
0 | 196 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
197 | |
198 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
199 // Stop treating discovered references specially. | |
200 disable_discovery(); | |
201 | |
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202 // If discovery was concurrent, someone could have modified |
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203 // the value of the static field in the j.l.r.SoftReference |
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204 // class that holds the soft reference timestamp clock using |
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205 // reflection or Unsafe between when discovery was enabled and |
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206 // now. Unconditionally update the static field in ReferenceProcessor |
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207 // here so that we use the new value during processing of the |
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208 // discovered soft refs. |
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209 |
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210 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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211 |
0 | 212 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 213 |
0 | 214 // Soft references |
10405 | 215 size_t soft_count = 0; |
0 | 216 { |
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217 GCTraceTime tt("SoftReference", trace_time, false, gc_timer, gc_id); |
10405 | 218 soft_count = |
219 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
220 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 221 } |
222 | |
223 update_soft_ref_master_clock(); | |
224 | |
225 // Weak references | |
10405 | 226 size_t weak_count = 0; |
0 | 227 { |
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228 GCTraceTime tt("WeakReference", trace_time, false, gc_timer, gc_id); |
10405 | 229 weak_count = |
230 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
231 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 232 } |
233 | |
234 // Final references | |
10405 | 235 size_t final_count = 0; |
0 | 236 { |
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237 GCTraceTime tt("FinalReference", trace_time, false, gc_timer, gc_id); |
10405 | 238 final_count = |
239 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
240 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 241 } |
242 | |
243 // Phantom references | |
10405 | 244 size_t phantom_count = 0; |
0 | 245 { |
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246 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer, gc_id); |
10405 | 247 phantom_count = |
248 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
249 is_alive, keep_alive, complete_gc, task_executor); | |
20755 | 250 |
251 // Process cleaners, but include them in phantom statistics. We expect | |
252 // Cleaner references to be temporary, and don't want to deal with | |
253 // possible incompatibilities arising from making it more visible. | |
254 phantom_count += | |
255 process_discovered_reflist(_discoveredCleanerRefs, NULL, false, | |
256 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 257 } |
258 | |
259 // Weak global JNI references. It would make more sense (semantically) to | |
260 // traverse these simultaneously with the regular weak references above, but | |
261 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
262 // thus use JNI weak references to circumvent the phantom references and | |
263 // resurrect a "post-mortem" object. | |
264 { | |
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265 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer, gc_id); |
0 | 266 if (task_executor != NULL) { |
267 task_executor->set_single_threaded_mode(); | |
268 } | |
269 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
270 } | |
10405 | 271 |
272 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 273 } |
274 | |
275 #ifndef PRODUCT | |
276 // Calculate the number of jni handles. | |
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277 uint ReferenceProcessor::count_jni_refs() { |
0 | 278 class AlwaysAliveClosure: public BoolObjectClosure { |
279 public: | |
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280 virtual bool do_object_b(oop obj) { return true; } |
0 | 281 }; |
282 | |
283 class CountHandleClosure: public OopClosure { | |
284 private: | |
285 int _count; | |
286 public: | |
287 CountHandleClosure(): _count(0) {} | |
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288 void do_oop(oop* unused) { _count++; } |
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289 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 290 int count() { return _count; } |
291 }; | |
292 CountHandleClosure global_handle_count; | |
293 AlwaysAliveClosure always_alive; | |
294 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
295 return global_handle_count.count(); | |
296 } | |
297 #endif | |
298 | |
299 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
300 OopClosure* keep_alive, | |
301 VoidClosure* complete_gc) { | |
302 #ifndef PRODUCT | |
303 if (PrintGCDetails && PrintReferenceGC) { | |
304 unsigned int count = count_jni_refs(); | |
305 gclog_or_tty->print(", %u refs", count); | |
306 } | |
307 #endif | |
308 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
309 complete_gc->do_void(); | |
310 } | |
311 | |
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312 |
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313 template <class T> |
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314 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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315 AbstractRefProcTaskExecutor* task_executor) { |
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316 |
0 | 317 // Remember old value of pending references list |
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318 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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319 T old_pending_list_value = *pending_list_addr; |
0 | 320 |
321 // Enqueue references that are not made active again, and | |
322 // clear the decks for the next collection (cycle). | |
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323 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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324 // Do the post-barrier on pending_list_addr missed in |
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325 // enqueue_discovered_reflist. |
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326 oopDesc::bs()->write_ref_field(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 // |
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351 // The Java threads will see the Reference objects linked together through |
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352 // the discovered field. Instead of trying to do the write barrier updates |
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353 // in all places in the reference processor where we manipulate the discovered |
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354 // field we make sure to do the barrier here where we anyway iterate through |
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355 // all linked Reference objects. Note that it is important to not dirty any |
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356 // cards during reference processing since this will cause card table |
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357 // verification to fail for G1. |
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358 // |
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359 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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360 // the "next" field is used to chain the pending list, not the discovered |
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361 // field. |
0 | 362 if (TraceReferenceGC && PrintGCDetails) { |
363 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
364 INTPTR_FORMAT, (address)refs_list.head()); | |
365 } | |
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366 |
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367 oop obj = NULL; |
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368 oop next_d = refs_list.head(); |
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369 if (pending_list_uses_discovered_field()) { // New behavior |
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370 // Walk down the list, self-looping the next field |
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371 // so that the References are not considered active. |
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372 while (obj != next_d) { |
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373 obj = next_d; |
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374 assert(obj->is_instanceRef(), "should be reference object"); |
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375 next_d = java_lang_ref_Reference::discovered(obj); |
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376 if (TraceReferenceGC && PrintGCDetails) { |
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377 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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378 (void *)obj, (void *)next_d); |
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379 } |
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380 assert(java_lang_ref_Reference::next(obj) == NULL, |
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381 "Reference not active; should not be discovered"); |
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382 // Self-loop next, so as to make Ref not active. |
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383 java_lang_ref_Reference::set_next_raw(obj, obj); |
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384 if (next_d != obj) { |
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385 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), next_d); |
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386 } else { |
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387 // This is the last object. |
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388 // Swap refs_list into pending_list_addr and |
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389 // set obj's discovered to what we read from pending_list_addr. |
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390 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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391 // Need post-barrier on pending_list_addr. See enqueue_discovered_ref_helper() above. |
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392 java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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393 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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394 } |
0 | 395 } |
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396 } else { // Old behaviour |
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397 // Walk down the list, copying the discovered field into |
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398 // the next field and clearing the discovered field. |
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399 while (obj != next_d) { |
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400 obj = next_d; |
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401 assert(obj->is_instanceRef(), "should be reference object"); |
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402 next_d = java_lang_ref_Reference::discovered(obj); |
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403 if (TraceReferenceGC && PrintGCDetails) { |
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404 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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405 (void *)obj, (void *)next_d); |
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406 } |
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407 assert(java_lang_ref_Reference::next(obj) == NULL, |
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408 "The reference should not be enqueued"); |
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409 if (next_d == obj) { // obj is last |
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410 // Swap refs_list into pendling_list_addr and |
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411 // set obj's next to what we read from pending_list_addr. |
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412 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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413 // Need oop_check on pending_list_addr above; |
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414 // see special oop-check code at the end of |
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415 // enqueue_discovered_reflists() further below. |
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416 if (old == NULL) { |
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417 // obj should be made to point to itself, since |
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418 // pending list was empty. |
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419 java_lang_ref_Reference::set_next(obj, obj); |
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420 } else { |
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421 java_lang_ref_Reference::set_next(obj, old); |
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422 } |
0 | 423 } else { |
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424 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 425 } |
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426 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 427 } |
428 } | |
429 } | |
430 | |
431 // Parallel enqueue task | |
432 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
433 public: | |
434 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
435 DiscoveredList discovered_refs[], | |
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436 HeapWord* pending_list_addr, |
0 | 437 int n_queues) |
438 : EnqueueTask(ref_processor, discovered_refs, | |
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439 pending_list_addr, n_queues) |
0 | 440 { } |
441 | |
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442 virtual void work(unsigned int work_id) { |
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443 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 444 // Simplest first cut: static partitioning. |
445 int index = work_id; | |
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446 // The increment on "index" must correspond to the maximum number of queues |
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447 // (n_queues) with which that ReferenceProcessor was created. That |
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448 // is because of the "clever" way the discovered references lists were |
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449 // allocated and are indexed into. |
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450 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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451 for (int j = 0; |
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452 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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453 j++, index += _n_queues) { |
0 | 454 _ref_processor.enqueue_discovered_reflist( |
455 _refs_lists[index], _pending_list_addr); | |
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456 _refs_lists[index].set_head(NULL); |
0 | 457 _refs_lists[index].set_length(0); |
458 } | |
459 } | |
460 }; | |
461 | |
462 // Enqueue references that are not made active again | |
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463 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 464 AbstractRefProcTaskExecutor* task_executor) { |
465 if (_processing_is_mt && task_executor != NULL) { | |
466 // Parallel code | |
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467 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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468 pending_list_addr, _max_num_q); |
0 | 469 task_executor->execute(tsk); |
470 } else { | |
471 // Serial code: call the parent class's implementation | |
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472 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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473 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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474 _discovered_refs[i].set_head(NULL); |
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475 _discovered_refs[i].set_length(0); |
0 | 476 } |
477 } | |
478 } | |
479 | |
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480 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 481 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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482 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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483 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 484 "discovered field is bad"); |
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485 _next = discovered; |
0 | 486 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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487 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 488 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
489 "Wrong oop found in java.lang.Reference object"); | |
490 assert(allow_null_referent ? | |
491 _referent->is_oop_or_null() | |
492 : _referent->is_oop(), | |
493 "bad referent"); | |
494 } | |
495 | |
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496 void DiscoveredListIterator::remove() { |
0 | 497 assert(_ref->is_oop(), "Dropping a bad reference"); |
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498 oop_store_raw(_discovered_addr, NULL); |
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499 |
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500 // First _prev_next ref actually points into DiscoveredList (gross). |
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501 oop new_next; |
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502 if (_next == _ref) { |
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503 // At the end of the list, we should make _prev point to itself. |
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504 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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505 // and _prev will be NULL. |
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506 new_next = _prev; |
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507 } else { |
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508 new_next = _next; |
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509 } |
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510 // Remove Reference object from discovered list. Note that G1 does not need a |
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511 // pre-barrier here because we know the Reference has already been found/marked, |
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512 // that's how it ended up in the discovered list in the first place. |
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513 oop_store_raw(_prev_next, new_next); |
0 | 514 NOT_PRODUCT(_removed++); |
452
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515 _refs_list.dec_length(1); |
0 | 516 } |
517 | |
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518 // Make the Reference object active again. |
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519 void DiscoveredListIterator::make_active() { |
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520 // The pre barrier for G1 is probably just needed for the old |
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521 // reference processing behavior. Should we guard this with |
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522 // ReferenceProcessor::pending_list_uses_discovered_field() ? |
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523 if (UseG1GC) { |
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524 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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525 if (UseCompressedOops) { |
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526 oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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527 } else { |
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528 oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
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529 } |
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530 } |
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531 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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532 } |
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533 |
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534 void DiscoveredListIterator::clear_referent() { |
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535 oop_store_raw(_referent_addr, NULL); |
0 | 536 } |
537 | |
538 // NOTE: process_phase*() are largely similar, and at a high level | |
539 // merely iterate over the extant list applying a predicate to | |
540 // each of its elements and possibly removing that element from the | |
541 // list and applying some further closures to that element. | |
542 // We should consider the possibility of replacing these | |
543 // process_phase*() methods by abstracting them into | |
544 // a single general iterator invocation that receives appropriate | |
545 // closures that accomplish this work. | |
546 | |
547 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
548 // referents are not alive, but that should be kept alive for policy reasons. | |
549 // Keep alive the transitive closure of all such referents. | |
550 void | |
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551 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 552 ReferencePolicy* policy, |
553 BoolObjectClosure* is_alive, | |
554 OopClosure* keep_alive, | |
555 VoidClosure* complete_gc) { | |
556 assert(policy != NULL, "Must have a non-NULL policy"); | |
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557 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 558 // Decide which softly reachable refs should be kept alive. |
559 while (iter.has_next()) { | |
560 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
561 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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562 if (referent_is_dead && |
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563 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 564 if (TraceReferenceGC) { |
565 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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566 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 567 } |
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568 // Remove Reference object from list |
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569 iter.remove(); |
0 | 570 // Make the Reference object active again |
571 iter.make_active(); | |
572 // keep the referent around | |
573 iter.make_referent_alive(); | |
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574 iter.move_to_next(); |
0 | 575 } else { |
576 iter.next(); | |
577 } | |
578 } | |
579 // Close the reachable set | |
580 complete_gc->do_void(); | |
581 NOT_PRODUCT( | |
582 if (PrintGCDetails && TraceReferenceGC) { | |
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583 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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584 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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585 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 586 } |
587 ) | |
588 } | |
589 | |
590 // Traverse the list and remove any Refs that are not active, or | |
591 // whose referents are either alive or NULL. | |
592 void | |
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593 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 594 BoolObjectClosure* is_alive, |
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595 OopClosure* keep_alive) { |
0 | 596 assert(discovery_is_atomic(), "Error"); |
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597 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 598 while (iter.has_next()) { |
599 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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600 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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601 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 602 if (iter.is_referent_alive()) { |
603 if (TraceReferenceGC) { | |
604 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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605 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 606 } |
607 // The referent is reachable after all. | |
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608 // Remove Reference object from list. |
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609 iter.remove(); |
0 | 610 // Update the referent pointer as necessary: Note that this |
611 // should not entail any recursive marking because the | |
612 // referent must already have been traversed. | |
613 iter.make_referent_alive(); | |
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614 iter.move_to_next(); |
0 | 615 } else { |
616 iter.next(); | |
617 } | |
618 } | |
619 NOT_PRODUCT( | |
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620 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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621 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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622 "Refs in discovered list " INTPTR_FORMAT, |
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623 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 624 } |
625 ) | |
626 } | |
627 | |
628 void | |
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629 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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630 BoolObjectClosure* is_alive, |
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631 OopClosure* keep_alive, |
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632 VoidClosure* complete_gc) { |
0 | 633 assert(!discovery_is_atomic(), "Error"); |
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634 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 635 while (iter.has_next()) { |
636 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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637 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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638 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 639 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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640 next != NULL)) { |
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641 assert(next->is_oop_or_null(), "bad next field"); |
0 | 642 // Remove Reference object from list |
643 iter.remove(); | |
644 // Trace the cohorts | |
645 iter.make_referent_alive(); | |
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646 if (UseCompressedOops) { |
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647 keep_alive->do_oop((narrowOop*)next_addr); |
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648 } else { |
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649 keep_alive->do_oop((oop*)next_addr); |
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650 } |
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651 iter.move_to_next(); |
0 | 652 } else { |
653 iter.next(); | |
654 } | |
655 } | |
656 // Now close the newly reachable set | |
657 complete_gc->do_void(); | |
658 NOT_PRODUCT( | |
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659 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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660 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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661 "Refs in discovered list " INTPTR_FORMAT, |
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662 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 663 } |
664 ) | |
665 } | |
666 | |
667 // Traverse the list and process the referents, by either | |
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668 // clearing them or keeping them (and their reachable |
0 | 669 // closure) alive. |
670 void | |
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671 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 672 bool clear_referent, |
673 BoolObjectClosure* is_alive, | |
674 OopClosure* keep_alive, | |
675 VoidClosure* complete_gc) { | |
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676 ResourceMark rm; |
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677 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 678 while (iter.has_next()) { |
679 iter.update_discovered(); | |
680 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
681 if (clear_referent) { | |
682 // NULL out referent pointer | |
683 iter.clear_referent(); | |
684 } else { | |
685 // keep the referent around | |
686 iter.make_referent_alive(); | |
687 } | |
688 if (TraceReferenceGC) { | |
689 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
690 clear_referent ? "cleared " : "", | |
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691 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 692 } |
693 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
694 iter.next(); | |
695 } | |
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696 // Remember to update the next pointer of the last ref. |
0 | 697 iter.update_discovered(); |
698 // Close the reachable set | |
699 complete_gc->do_void(); | |
700 } | |
701 | |
702 void | |
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703 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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704 oop obj = NULL; |
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705 oop next = refs_list.head(); |
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706 while (next != obj) { |
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707 obj = next; |
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708 next = java_lang_ref_Reference::discovered(obj); |
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709 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 710 } |
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711 refs_list.set_head(NULL); |
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712 refs_list.set_length(0); |
0 | 713 } |
714 | |
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715 void |
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716 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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717 clear_discovered_references(refs_list); |
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718 } |
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719 |
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720 void ReferenceProcessor::abandon_partial_discovery() { |
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721 // loop over the lists |
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722 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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723 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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724 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
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725 } |
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726 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 727 } |
728 } | |
729 | |
730 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
731 public: | |
732 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
733 DiscoveredList refs_lists[], | |
734 ReferencePolicy* policy, | |
735 bool marks_oops_alive) | |
736 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
737 _policy(policy) | |
738 { } | |
739 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
740 OopClosure& keep_alive, | |
741 VoidClosure& complete_gc) | |
742 { | |
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743 Thread* thr = Thread::current(); |
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744 int refs_list_index = ((WorkerThread*)thr)->id(); |
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745 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 746 &is_alive, &keep_alive, &complete_gc); |
747 } | |
748 private: | |
749 ReferencePolicy* _policy; | |
750 }; | |
751 | |
752 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
753 public: | |
754 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
755 DiscoveredList refs_lists[], | |
756 bool marks_oops_alive) | |
757 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
758 { } | |
759 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
760 OopClosure& keep_alive, | |
761 VoidClosure& complete_gc) | |
762 { | |
763 _ref_processor.process_phase2(_refs_lists[i], | |
764 &is_alive, &keep_alive, &complete_gc); | |
765 } | |
766 }; | |
767 | |
768 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
769 public: | |
770 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
771 DiscoveredList refs_lists[], | |
772 bool clear_referent, | |
773 bool marks_oops_alive) | |
774 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
775 _clear_referent(clear_referent) | |
776 { } | |
777 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
778 OopClosure& keep_alive, | |
779 VoidClosure& complete_gc) | |
780 { | |
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781 // Don't use "refs_list_index" calculated in this way because |
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782 // balance_queues() has moved the Ref's into the first n queues. |
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783 // Thread* thr = Thread::current(); |
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784 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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785 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 786 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
787 &is_alive, &keep_alive, &complete_gc); | |
788 } | |
789 private: | |
790 bool _clear_referent; | |
791 }; | |
792 | |
793 // Balances reference queues. | |
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794 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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795 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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796 // corresponding to the active workers will be processed. |
0 | 797 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
798 { | |
799 // calculate total length | |
800 size_t total_refs = 0; | |
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801 if (TraceReferenceGC && PrintGCDetails) { |
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802 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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803 } |
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804 |
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805 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 806 total_refs += ref_lists[i].length(); |
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807 if (TraceReferenceGC && PrintGCDetails) { |
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808 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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809 } |
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810 } |
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811 if (TraceReferenceGC && PrintGCDetails) { |
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812 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 813 } |
814 size_t avg_refs = total_refs / _num_q + 1; | |
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815 uint to_idx = 0; |
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816 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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817 bool move_all = false; |
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818 if (from_idx >= _num_q) { |
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819 move_all = ref_lists[from_idx].length() > 0; |
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820 } |
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821 while ((ref_lists[from_idx].length() > avg_refs) || |
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822 move_all) { |
0 | 823 assert(to_idx < _num_q, "Sanity Check!"); |
824 if (ref_lists[to_idx].length() < avg_refs) { | |
825 // move superfluous refs | |
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826 size_t refs_to_move; |
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827 // Move all the Ref's if the from queue will not be processed. |
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828 if (move_all) { |
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829 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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830 avg_refs - ref_lists[to_idx].length()); |
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831 } else { |
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832 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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833 avg_refs - ref_lists[to_idx].length()); |
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834 } |
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835 |
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836 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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837 |
0 | 838 oop move_head = ref_lists[from_idx].head(); |
839 oop move_tail = move_head; | |
840 oop new_head = move_head; | |
841 // find an element to split the list on | |
842 for (size_t j = 0; j < refs_to_move; ++j) { | |
843 move_tail = new_head; | |
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844 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 845 } |
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846 |
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847 // Add the chain to the to list. |
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848 if (ref_lists[to_idx].head() == NULL) { |
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849 // to list is empty. Make a loop at the end. |
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850 java_lang_ref_Reference::set_discovered_raw(move_tail, move_tail); |
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851 } else { |
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852 java_lang_ref_Reference::set_discovered_raw(move_tail, ref_lists[to_idx].head()); |
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853 } |
0 | 854 ref_lists[to_idx].set_head(move_head); |
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855 ref_lists[to_idx].inc_length(refs_to_move); |
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856 |
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857 // Remove the chain from the from list. |
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858 if (move_tail == new_head) { |
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859 // We found the end of the from list. |
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860 ref_lists[from_idx].set_head(NULL); |
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861 } else { |
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862 ref_lists[from_idx].set_head(new_head); |
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863 } |
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864 ref_lists[from_idx].dec_length(refs_to_move); |
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865 if (ref_lists[from_idx].length() == 0) { |
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866 break; |
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867 } |
0 | 868 } else { |
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869 to_idx = (to_idx + 1) % _num_q; |
0 | 870 } |
871 } | |
872 } | |
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873 #ifdef ASSERT |
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874 size_t balanced_total_refs = 0; |
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875 for (uint i = 0; i < _max_num_q; ++i) { |
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876 balanced_total_refs += ref_lists[i].length(); |
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877 if (TraceReferenceGC && PrintGCDetails) { |
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878 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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879 } |
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880 } |
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881 if (TraceReferenceGC && PrintGCDetails) { |
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882 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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883 gclog_or_tty->flush(); |
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884 } |
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885 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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886 #endif |
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887 } |
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888 |
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889 void ReferenceProcessor::balance_all_queues() { |
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890 balance_queues(_discoveredSoftRefs); |
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891 balance_queues(_discoveredWeakRefs); |
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892 balance_queues(_discoveredFinalRefs); |
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893 balance_queues(_discoveredPhantomRefs); |
20755 | 894 balance_queues(_discoveredCleanerRefs); |
0 | 895 } |
896 | |
10405 | 897 size_t |
0 | 898 ReferenceProcessor::process_discovered_reflist( |
899 DiscoveredList refs_lists[], | |
900 ReferencePolicy* policy, | |
901 bool clear_referent, | |
902 BoolObjectClosure* is_alive, | |
903 OopClosure* keep_alive, | |
904 VoidClosure* complete_gc, | |
905 AbstractRefProcTaskExecutor* task_executor) | |
906 { | |
1833
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907 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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908 // If discovery used MT and a dynamic number of GC threads, then |
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909 // the queues must be balanced for correctness if fewer than the |
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910 // maximum number of queues were used. The number of queue used |
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911 // during discovery may be different than the number to be used |
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912 // for processing so don't depend of _num_q < _max_num_q as part |
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913 // of the test. |
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914 bool must_balance = _discovery_is_mt; |
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915 |
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916 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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917 must_balance) { |
0 | 918 balance_queues(refs_lists); |
919 } | |
10405 | 920 |
921 size_t total_list_count = total_count(refs_lists); | |
922 | |
0 | 923 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 924 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 925 } |
926 | |
927 // Phase 1 (soft refs only): | |
928 // . Traverse the list and remove any SoftReferences whose | |
929 // referents are not alive, but that should be kept alive for | |
930 // policy reasons. Keep alive the transitive closure of all | |
931 // such referents. | |
932 if (policy != NULL) { | |
1833
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933 if (mt_processing) { |
0 | 934 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
935 task_executor->execute(phase1); | |
936 } else { | |
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937 for (uint i = 0; i < _max_num_q; i++) { |
0 | 938 process_phase1(refs_lists[i], policy, |
939 is_alive, keep_alive, complete_gc); | |
940 } | |
941 } | |
942 } else { // policy == NULL | |
943 assert(refs_lists != _discoveredSoftRefs, | |
944 "Policy must be specified for soft references."); | |
945 } | |
946 | |
947 // Phase 2: | |
948 // . Traverse the list and remove any refs whose referents are alive. | |
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949 if (mt_processing) { |
0 | 950 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
951 task_executor->execute(phase2); | |
952 } else { | |
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953 for (uint i = 0; i < _max_num_q; i++) { |
0 | 954 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
955 } | |
956 } | |
957 | |
958 // Phase 3: | |
959 // . Traverse the list and process referents as appropriate. | |
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960 if (mt_processing) { |
0 | 961 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
962 task_executor->execute(phase3); | |
963 } else { | |
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964 for (uint i = 0; i < _max_num_q; i++) { |
0 | 965 process_phase3(refs_lists[i], clear_referent, |
966 is_alive, keep_alive, complete_gc); | |
967 } | |
968 } | |
10405 | 969 |
970 return total_list_count; | |
0 | 971 } |
972 | |
973 void ReferenceProcessor::clean_up_discovered_references() { | |
974 // loop over the lists | |
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975 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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976 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 977 gclog_or_tty->print_cr( |
978 "\nScrubbing %s discovered list of Null referents", | |
979 list_name(i)); | |
980 } | |
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981 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 982 } |
983 } | |
984 | |
985 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
986 assert(!discovery_is_atomic(), "Else why call this method?"); | |
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987 DiscoveredListIterator iter(refs_list, NULL, NULL); |
0 | 988 while (iter.has_next()) { |
989 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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990 oop next = java_lang_ref_Reference::next(iter.obj()); |
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991 assert(next->is_oop_or_null(), "bad next field"); |
0 | 992 // If referent has been cleared or Reference is not active, |
993 // drop it. | |
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994 if (iter.referent() == NULL || next != NULL) { |
0 | 995 debug_only( |
996 if (PrintGCDetails && TraceReferenceGC) { | |
997 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
998 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
999 " and referent: " INTPTR_FORMAT, | |
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1000 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 1001 } |
1002 ) | |
1003 // Remove Reference object from list | |
1004 iter.remove(); | |
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1005 iter.move_to_next(); |
0 | 1006 } else { |
1007 iter.next(); | |
1008 } | |
1009 } | |
1010 NOT_PRODUCT( | |
1011 if (PrintGCDetails && TraceReferenceGC) { | |
1012 gclog_or_tty->print( | |
1013 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1014 iter.removed(), iter.processed()); | |
1015 } | |
1016 ) | |
1017 } | |
1018 | |
1019 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1020 uint id = 0; |
0 | 1021 // Determine the queue index to use for this object. |
1022 if (_discovery_is_mt) { | |
1023 // During a multi-threaded discovery phase, | |
1024 // each thread saves to its "own" list. | |
1025 Thread* thr = Thread::current(); | |
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1026 id = thr->as_Worker_thread()->id(); |
0 | 1027 } else { |
1028 // single-threaded discovery, we save in round-robin | |
1029 // fashion to each of the lists. | |
1030 if (_processing_is_mt) { | |
1031 id = next_id(); | |
1032 } | |
1033 } | |
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1034 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1035 |
1036 // Get the discovered queue to which we will add | |
1037 DiscoveredList* list = NULL; | |
1038 switch (rt) { | |
1039 case REF_OTHER: | |
1040 // Unknown reference type, no special treatment | |
1041 break; | |
1042 case REF_SOFT: | |
1043 list = &_discoveredSoftRefs[id]; | |
1044 break; | |
1045 case REF_WEAK: | |
1046 list = &_discoveredWeakRefs[id]; | |
1047 break; | |
1048 case REF_FINAL: | |
1049 list = &_discoveredFinalRefs[id]; | |
1050 break; | |
1051 case REF_PHANTOM: | |
1052 list = &_discoveredPhantomRefs[id]; | |
1053 break; | |
20755 | 1054 case REF_CLEANER: |
1055 list = &_discoveredCleanerRefs[id]; | |
1056 break; | |
0 | 1057 case REF_NONE: |
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1058 // we should not reach here if we are an InstanceRefKlass |
0 | 1059 default: |
1060 ShouldNotReachHere(); | |
1061 } | |
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1062 if (TraceReferenceGC && PrintGCDetails) { |
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1063 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1064 } |
0 | 1065 return list; |
1066 } | |
1067 | |
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1068 inline void |
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1069 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1070 oop obj, |
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1071 HeapWord* discovered_addr) { |
0 | 1072 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1073 // First we must make sure this object is only enqueued once. CAS in a non null | |
1074 // discovered_addr. | |
342
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1075 oop current_head = refs_list.head(); |
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1076 // The last ref must have its discovered field pointing to itself. |
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1077 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1078 |
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1079 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1080 NULL); |
0 | 1081 if (retest == NULL) { |
1082 // This thread just won the right to enqueue the object. | |
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1083 // We have separate lists for enqueueing, so no synchronization |
0 | 1084 // is necessary. |
113
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1085 refs_list.set_head(obj); |
452
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1086 refs_list.inc_length(1); |
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1087 |
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1088 if (TraceReferenceGC) { |
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1089 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1090 (void *)obj, obj->klass()->internal_name()); |
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1091 } |
0 | 1092 } else { |
1093 // If retest was non NULL, another thread beat us to it: | |
1094 // The reference has already been discovered... | |
1095 if (TraceReferenceGC) { | |
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1096 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1097 (void *)obj, obj->klass()->internal_name()); |
0 | 1098 } |
1099 } | |
1100 } | |
1101 | |
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1102 #ifndef PRODUCT |
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1103 // Non-atomic (i.e. concurrent) discovery might allow us |
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1104 // to observe j.l.References with NULL referents, being those |
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1105 // cleared concurrently by mutators during (or after) discovery. |
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1106 void ReferenceProcessor::verify_referent(oop obj) { |
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1107 bool da = discovery_is_atomic(); |
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1108 oop referent = java_lang_ref_Reference::referent(obj); |
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1109 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1110 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1111 INTPTR_FORMAT " during %satomic discovery ", |
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1112 (void *)referent, (void *)obj, da ? "" : "non-")); |
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1113 } |
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1114 #endif |
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1115 |
0 | 1116 // We mention two of several possible choices here: |
1117 // #0: if the reference object is not in the "originating generation" | |
1118 // (or part of the heap being collected, indicated by our "span" | |
1119 // we don't treat it specially (i.e. we scan it as we would | |
1120 // a normal oop, treating its references as strong references). | |
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1121 // This means that references can't be discovered unless their |
0 | 1122 // referent is also in the same span. This is the simplest, |
1123 // most "local" and most conservative approach, albeit one | |
1124 // that may cause weak references to be enqueued least promptly. | |
1125 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1126 // #1: the reference object may be in any generation (span), but if | |
1127 // the referent is in the generation (span) being currently collected | |
1128 // then we can discover the reference object, provided | |
1129 // the object has not already been discovered by | |
1130 // a different concurrently running collector (as may be the | |
1131 // case, for instance, if the reference object is in CMS and | |
1132 // the referent in DefNewGeneration), and provided the processing | |
1133 // of this reference object by the current collector will | |
1134 // appear atomic to every other collector in the system. | |
1135 // (Thus, for instance, a concurrent collector may not | |
1136 // discover references in other generations even if the | |
1137 // referent is in its own generation). This policy may, | |
1138 // in certain cases, enqueue references somewhat sooner than | |
1139 // might Policy #0 above, but at marginally increased cost | |
1140 // and complexity in processing these references. | |
1141 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1142 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1143 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1144 if (!_discovering_refs || !RegisterReferences) { |
1145 return false; | |
1146 } | |
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1147 // We only discover active references. |
113
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1148 oop next = java_lang_ref_Reference::next(obj); |
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1149 if (next != NULL) { // Ref is no longer active |
0 | 1150 return false; |
1151 } | |
1152 | |
1153 HeapWord* obj_addr = (HeapWord*)obj; | |
1154 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1155 !_span.contains(obj_addr)) { | |
1156 // Reference is not in the originating generation; | |
1157 // don't treat it specially (i.e. we want to scan it as a normal | |
1158 // object with strong references). | |
1159 return false; | |
1160 } | |
1161 | |
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1162 // We only discover references whose referents are not (yet) |
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1163 // known to be strongly reachable. |
0 | 1164 if (is_alive_non_header() != NULL) { |
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1165 verify_referent(obj); |
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1166 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1167 return false; // referent is reachable |
1168 } | |
1169 } | |
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1170 if (rt == REF_SOFT) { |
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1171 // For soft refs we can decide now if these are not |
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1172 // current candidates for clearing, in which case we |
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1173 // can mark through them now, rather than delaying that |
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1174 // to the reference-processing phase. Since all current |
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1175 // time-stamp policies advance the soft-ref clock only |
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1176 // at a major collection cycle, this is always currently |
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1177 // accurate. |
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1178 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
453
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1179 return false; |
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1180 } |
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1181 } |
0 | 1182 |
3979
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1183 ResourceMark rm; // Needed for tracing. |
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1184 |
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1185 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1186 const oop discovered = java_lang_ref_Reference::discovered(obj); |
113
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1187 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1188 if (discovered != NULL) { |
0 | 1189 // The reference has already been discovered... |
1190 if (TraceReferenceGC) { | |
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1191 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1192 (void *)obj, obj->klass()->internal_name()); |
0 | 1193 } |
1194 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1195 // assumes that an object is not processed twice; | |
1196 // if it's been already discovered it must be on another | |
1197 // generation's discovered list; so we won't discover it. | |
1198 return false; | |
1199 } else { | |
1200 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1201 "Unrecognized policy"); | |
1202 // Check assumption that an object is not potentially | |
1203 // discovered twice except by concurrent collectors that potentially | |
1204 // trace the same Reference object twice. | |
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1205 assert(UseConcMarkSweepGC || UseG1GC, |
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1206 "Only possible with a concurrent marking collector"); |
0 | 1207 return true; |
1208 } | |
1209 } | |
1210 | |
1211 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1212 verify_referent(obj); |
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1213 // Discover if and only if EITHER: |
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1214 // .. reference is in our span, OR |
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1215 // .. we are an atomic collector and referent is in our span |
0 | 1216 if (_span.contains(obj_addr) || |
1995
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1217 (discovery_is_atomic() && |
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1218 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1219 // should_enqueue = true; |
1220 } else { | |
1221 return false; | |
1222 } | |
1223 } else { | |
1224 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1225 _span.contains(obj_addr), "code inconsistency"); | |
1226 } | |
1227 | |
1228 // Get the right type of discovered queue head. | |
1229 DiscoveredList* list = get_discovered_list(rt); | |
1230 if (list == NULL) { | |
1231 return false; // nothing special needs to be done | |
1232 } | |
1233 | |
1234 if (_discovery_is_mt) { | |
1235 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1236 } else { | |
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1237 // We do a raw store here: the field will be visited later when processing |
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1238 // the discovered references. |
342
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1239 oop current_head = list->head(); |
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1240 // The last ref must have its discovered field pointing to itself. |
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1241 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1242 |
342
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1243 assert(discovered == NULL, "control point invariant"); |
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1244 oop_store_raw(discovered_addr, next_discovered); |
0 | 1245 list->set_head(obj); |
452
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1246 list->inc_length(1); |
0 | 1247 |
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1248 if (TraceReferenceGC) { |
3917
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|
1249 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1250 (void *)obj, obj->klass()->internal_name()); |
0 | 1251 } |
1252 } | |
3917
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|
1253 assert(obj->is_oop(), "Discovered a bad reference"); |
1995
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|
1254 verify_referent(obj); |
0 | 1255 return true; |
1256 } | |
1257 | |
1258 // Preclean the discovered references by removing those | |
1259 // whose referents are alive, and by marking from those that | |
1260 // are not active. These lists can be handled here | |
1261 // in any order and, indeed, concurrently. | |
1262 void ReferenceProcessor::preclean_discovered_references( | |
1263 BoolObjectClosure* is_alive, | |
1264 OopClosure* keep_alive, | |
1265 VoidClosure* complete_gc, | |
10405 | 1266 YieldClosure* yield, |
20190
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|
1267 GCTimer* gc_timer, |
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|
1268 GCId gc_id) { |
0 | 1269 |
1270 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1271 | |
1272 // Soft references | |
1273 { | |
10405 | 1274 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
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1275 false, gc_timer, gc_id); |
4728
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7121618: Change type of number of GC workers to unsigned int.
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diff
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1276 for (uint i = 0; i < _max_num_q; i++) { |
452
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|
1277 if (yield->should_return()) { |
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|
1278 return; |
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|
1279 } |
0 | 1280 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1281 keep_alive, complete_gc, yield); | |
1282 } | |
1283 } | |
1284 | |
1285 // Weak references | |
1286 { | |
10405 | 1287 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
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1288 false, gc_timer, gc_id); |
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1289 for (uint i = 0; i < _max_num_q; i++) { |
452
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1290 if (yield->should_return()) { |
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1291 return; |
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1292 } |
0 | 1293 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1294 keep_alive, complete_gc, yield); | |
1295 } | |
1296 } | |
1297 | |
1298 // Final references | |
1299 { | |
10405 | 1300 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
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1301 false, gc_timer, gc_id); |
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1302 for (uint i = 0; i < _max_num_q; i++) { |
452
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1303 if (yield->should_return()) { |
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1304 return; |
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1305 } |
0 | 1306 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1307 keep_alive, complete_gc, yield); | |
1308 } | |
1309 } | |
1310 | |
1311 // Phantom references | |
1312 { | |
10405 | 1313 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
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1314 false, gc_timer, gc_id); |
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1315 for (uint i = 0; i < _max_num_q; i++) { |
452
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1316 if (yield->should_return()) { |
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1317 return; |
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1318 } |
0 | 1319 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1320 keep_alive, complete_gc, yield); | |
1321 } | |
20755 | 1322 |
1323 // Cleaner references. Included in timing for phantom references. We | |
1324 // expect Cleaner references to be temporary, and don't want to deal with | |
1325 // possible incompatibilities arising from making it more visible. | |
1326 for (uint i = 0; i < _max_num_q; i++) { | |
1327 if (yield->should_return()) { | |
1328 return; | |
1329 } | |
1330 preclean_discovered_reflist(_discoveredCleanerRefs[i], is_alive, | |
1331 keep_alive, complete_gc, yield); | |
1332 } | |
0 | 1333 } |
1334 } | |
1335 | |
1336 // Walk the given discovered ref list, and remove all reference objects | |
1337 // whose referents are still alive, whose referents are NULL or which | |
452
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1338 // are not active (have a non-NULL next field). NOTE: When we are |
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1339 // thus precleaning the ref lists (which happens single-threaded today), |
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1340 // we do not disable refs discovery to honour the correct semantics of |
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1341 // java.lang.Reference. As a result, we need to be careful below |
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1342 // that ref removal steps interleave safely with ref discovery steps |
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1343 // (in this thread). |
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1344 void |
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1345 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1346 BoolObjectClosure* is_alive, |
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1347 OopClosure* keep_alive, |
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1348 VoidClosure* complete_gc, |
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1349 YieldClosure* yield) { |
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1350 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 1351 while (iter.has_next()) { |
1352 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1353 oop obj = iter.obj(); |
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1354 oop next = java_lang_ref_Reference::next(obj); |
0 | 1355 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1356 next != NULL) { |
0 | 1357 // The referent has been cleared, or is alive, or the Reference is not |
1358 // active; we need to trace and mark its cohort. | |
1359 if (TraceReferenceGC) { | |
1360 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1361 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1362 } |
1363 // Remove Reference object from list | |
1364 iter.remove(); | |
1365 // Keep alive its cohort. | |
1366 iter.make_referent_alive(); | |
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1367 if (UseCompressedOops) { |
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1368 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1369 keep_alive->do_oop(next_addr); |
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1370 } else { |
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1371 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1372 keep_alive->do_oop(next_addr); |
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1373 } |
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1374 iter.move_to_next(); |
0 | 1375 } else { |
1376 iter.next(); | |
1377 } | |
1378 } | |
1379 // Close the reachable set | |
1380 complete_gc->do_void(); | |
1381 | |
1382 NOT_PRODUCT( | |
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1383 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1384 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1385 "Refs in discovered list " INTPTR_FORMAT, |
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1386 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1387 } |
1388 ) | |
1389 } | |
1390 | |
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1391 const char* ReferenceProcessor::list_name(uint i) { |
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1392 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1393 "Out of bounds index"); |
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1394 |
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1395 int j = i / _max_num_q; |
0 | 1396 switch (j) { |
1397 case 0: return "SoftRef"; | |
1398 case 1: return "WeakRef"; | |
1399 case 2: return "FinalRef"; | |
1400 case 3: return "PhantomRef"; | |
20755 | 1401 case 4: return "CleanerRef"; |
0 | 1402 } |
1403 ShouldNotReachHere(); | |
1404 return NULL; | |
1405 } | |
1406 | |
1407 #ifndef PRODUCT | |
1408 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1409 // empty for now | |
1410 } | |
1411 #endif | |
1412 | |
1413 #ifndef PRODUCT | |
1414 void ReferenceProcessor::clear_discovered_references() { | |
1415 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1416 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1417 clear_discovered_references(_discovered_refs[i]); |
0 | 1418 } |
1419 } | |
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1420 |
0 | 1421 #endif // PRODUCT |