Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 20074:a7ee2e1f0d4e
remove UnboxNodes without usages (if object is non-null)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 30 Mar 2015 13:59:59 +0200 |
parents | 52b4284cb496 |
children | 7848fc12602b |
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]; |
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121 |
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122 // Initialize all entries to NULL |
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123 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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124 _discovered_refs[i].set_head(NULL); |
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125 _discovered_refs[i].set_length(0); |
0 | 126 } |
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127 |
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128 setup_policy(false /* default soft ref policy */); |
0 | 129 } |
130 | |
131 #ifndef PRODUCT | |
132 void ReferenceProcessor::verify_no_references_recorded() { | |
133 guarantee(!_discovering_refs, "Discovering refs?"); | |
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134 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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135 guarantee(_discovered_refs[i].is_empty(), |
0 | 136 "Found non-empty discovered list"); |
137 } | |
138 } | |
139 #endif | |
140 | |
141 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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142 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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143 if (UseCompressedOops) { |
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144 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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145 } else { |
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146 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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147 } |
0 | 148 } |
149 } | |
150 | |
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151 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 152 // Update (advance) the soft ref master clock field. This must be done |
153 // after processing the soft ref list. | |
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154 |
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155 // We need a monotonically non-deccreasing time in ms but |
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156 // os::javaTimeMillis() does not guarantee monotonicity. |
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157 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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158 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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159 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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160 |
0 | 161 NOT_PRODUCT( |
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162 if (now < _soft_ref_timestamp_clock) { |
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163 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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164 _soft_ref_timestamp_clock, now); |
0 | 165 } |
166 ) | |
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167 // The values of now and _soft_ref_timestamp_clock are set using |
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168 // javaTimeNanos(), which is guaranteed to be monotonically |
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169 // non-decreasing provided the underlying platform provides such |
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170 // a time source (and it is bug free). |
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171 // In product mode, however, protect ourselves from non-monotonicty. |
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172 if (now > _soft_ref_timestamp_clock) { |
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173 _soft_ref_timestamp_clock = now; |
0 | 174 java_lang_ref_SoftReference::set_clock(now); |
175 } | |
176 // Else leave clock stalled at its old value until time progresses | |
177 // past clock value. | |
178 } | |
179 | |
10405 | 180 size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
181 size_t total = 0; | |
182 for (uint i = 0; i < _max_num_q; ++i) { | |
183 total += lists[i].length(); | |
184 } | |
185 return total; | |
186 } | |
187 | |
188 ReferenceProcessorStats ReferenceProcessor::process_discovered_references( | |
0 | 189 BoolObjectClosure* is_alive, |
190 OopClosure* keep_alive, | |
191 VoidClosure* complete_gc, | |
10405 | 192 AbstractRefProcTaskExecutor* task_executor, |
193 GCTimer* gc_timer) { | |
0 | 194 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
195 | |
196 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
197 // Stop treating discovered references specially. | |
198 disable_discovery(); | |
199 | |
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200 // If discovery was concurrent, someone could have modified |
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201 // the value of the static field in the j.l.r.SoftReference |
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202 // class that holds the soft reference timestamp clock using |
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203 // reflection or Unsafe between when discovery was enabled and |
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204 // now. Unconditionally update the static field in ReferenceProcessor |
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205 // here so that we use the new value during processing of the |
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206 // discovered soft refs. |
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207 |
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208 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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209 |
0 | 210 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 211 |
0 | 212 // Soft references |
10405 | 213 size_t soft_count = 0; |
0 | 214 { |
10405 | 215 GCTraceTime tt("SoftReference", trace_time, false, gc_timer); |
216 soft_count = | |
217 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
218 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 219 } |
220 | |
221 update_soft_ref_master_clock(); | |
222 | |
223 // Weak references | |
10405 | 224 size_t weak_count = 0; |
0 | 225 { |
10405 | 226 GCTraceTime tt("WeakReference", trace_time, false, gc_timer); |
227 weak_count = | |
228 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
229 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 230 } |
231 | |
232 // Final references | |
10405 | 233 size_t final_count = 0; |
0 | 234 { |
10405 | 235 GCTraceTime tt("FinalReference", trace_time, false, gc_timer); |
236 final_count = | |
237 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
238 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 239 } |
240 | |
241 // Phantom references | |
10405 | 242 size_t phantom_count = 0; |
0 | 243 { |
10405 | 244 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer); |
245 phantom_count = | |
246 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
247 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 248 } |
249 | |
250 // Weak global JNI references. It would make more sense (semantically) to | |
251 // traverse these simultaneously with the regular weak references above, but | |
252 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
253 // thus use JNI weak references to circumvent the phantom references and | |
254 // resurrect a "post-mortem" object. | |
255 { | |
10405 | 256 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer); |
0 | 257 if (task_executor != NULL) { |
258 task_executor->set_single_threaded_mode(); | |
259 } | |
260 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
261 } | |
10405 | 262 |
263 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 264 } |
265 | |
266 #ifndef PRODUCT | |
267 // Calculate the number of jni handles. | |
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268 uint ReferenceProcessor::count_jni_refs() { |
0 | 269 class AlwaysAliveClosure: public BoolObjectClosure { |
270 public: | |
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271 virtual bool do_object_b(oop obj) { return true; } |
0 | 272 }; |
273 | |
274 class CountHandleClosure: public OopClosure { | |
275 private: | |
276 int _count; | |
277 public: | |
278 CountHandleClosure(): _count(0) {} | |
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279 void do_oop(oop* unused) { _count++; } |
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280 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 281 int count() { return _count; } |
282 }; | |
283 CountHandleClosure global_handle_count; | |
284 AlwaysAliveClosure always_alive; | |
285 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
286 return global_handle_count.count(); | |
287 } | |
288 #endif | |
289 | |
290 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
291 OopClosure* keep_alive, | |
292 VoidClosure* complete_gc) { | |
293 #ifndef PRODUCT | |
294 if (PrintGCDetails && PrintReferenceGC) { | |
295 unsigned int count = count_jni_refs(); | |
296 gclog_or_tty->print(", %u refs", count); | |
297 } | |
298 #endif | |
299 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
300 complete_gc->do_void(); | |
301 } | |
302 | |
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303 |
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304 template <class T> |
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305 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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306 AbstractRefProcTaskExecutor* task_executor) { |
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307 |
0 | 308 // Remember old value of pending references list |
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309 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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310 T old_pending_list_value = *pending_list_addr; |
0 | 311 |
312 // Enqueue references that are not made active again, and | |
313 // clear the decks for the next collection (cycle). | |
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314 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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315 // Do the post-barrier on pending_list_addr missed in |
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316 // enqueue_discovered_reflist. |
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317 oopDesc::bs()->write_ref_field(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 318 |
319 // Stop treating discovered references specially. | |
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320 ref->disable_discovery(); |
0 | 321 |
322 // Return true if new pending references were added | |
323 return old_pending_list_value != *pending_list_addr; | |
324 } | |
325 | |
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326 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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327 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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328 if (UseCompressedOops) { |
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329 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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330 } else { |
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331 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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332 } |
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333 } |
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334 |
0 | 335 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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336 HeapWord* pending_list_addr) { |
0 | 337 // Given a list of refs linked through the "discovered" field |
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338 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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339 // thus distinguishing them from active References, then |
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340 // prepend them to the pending list. |
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341 // |
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342 // The Java threads will see the Reference objects linked together through |
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343 // the discovered field. Instead of trying to do the write barrier updates |
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344 // in all places in the reference processor where we manipulate the discovered |
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345 // field we make sure to do the barrier here where we anyway iterate through |
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346 // all linked Reference objects. Note that it is important to not dirty any |
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347 // cards during reference processing since this will cause card table |
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348 // verification to fail for G1. |
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349 // |
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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. |
0 | 353 if (TraceReferenceGC && PrintGCDetails) { |
354 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
355 INTPTR_FORMAT, (address)refs_list.head()); | |
356 } | |
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357 |
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358 oop obj = NULL; |
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359 oop next_d = refs_list.head(); |
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360 if (pending_list_uses_discovered_field()) { // New behavior |
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361 // Walk down the list, self-looping the next field |
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362 // so that the References are not considered active. |
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363 while (obj != next_d) { |
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364 obj = next_d; |
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365 assert(obj->is_instanceRef(), "should be reference object"); |
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366 next_d = java_lang_ref_Reference::discovered(obj); |
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367 if (TraceReferenceGC && PrintGCDetails) { |
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368 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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369 (void *)obj, (void *)next_d); |
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370 } |
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371 assert(java_lang_ref_Reference::next(obj) == NULL, |
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372 "Reference not active; should not be discovered"); |
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373 // Self-loop next, so as to make Ref not active. |
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374 java_lang_ref_Reference::set_next_raw(obj, obj); |
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375 if (next_d != obj) { |
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376 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), next_d); |
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377 } else { |
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378 // This is the last object. |
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379 // Swap refs_list into pending_list_addr and |
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380 // set obj's discovered to what we read from pending_list_addr. |
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381 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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382 // Need post-barrier on pending_list_addr. See enqueue_discovered_ref_helper() above. |
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383 java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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384 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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385 } |
0 | 386 } |
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387 } else { // Old behaviour |
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388 // Walk down the list, copying the discovered field into |
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389 // the next field and clearing the discovered field. |
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390 while (obj != next_d) { |
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391 obj = next_d; |
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392 assert(obj->is_instanceRef(), "should be reference object"); |
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393 next_d = java_lang_ref_Reference::discovered(obj); |
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394 if (TraceReferenceGC && PrintGCDetails) { |
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395 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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396 (void *)obj, (void *)next_d); |
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397 } |
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398 assert(java_lang_ref_Reference::next(obj) == NULL, |
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399 "The reference should not be enqueued"); |
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400 if (next_d == obj) { // obj is last |
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401 // Swap refs_list into pendling_list_addr and |
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402 // set obj's next to what we read from pending_list_addr. |
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403 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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404 // Need oop_check on pending_list_addr above; |
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405 // see special oop-check code at the end of |
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406 // enqueue_discovered_reflists() further below. |
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407 if (old == NULL) { |
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408 // obj should be made to point to itself, since |
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409 // pending list was empty. |
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410 java_lang_ref_Reference::set_next(obj, obj); |
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411 } else { |
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412 java_lang_ref_Reference::set_next(obj, old); |
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413 } |
0 | 414 } else { |
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415 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 416 } |
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417 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 418 } |
419 } | |
420 } | |
421 | |
422 // Parallel enqueue task | |
423 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
424 public: | |
425 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
426 DiscoveredList discovered_refs[], | |
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427 HeapWord* pending_list_addr, |
0 | 428 int n_queues) |
429 : EnqueueTask(ref_processor, discovered_refs, | |
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430 pending_list_addr, n_queues) |
0 | 431 { } |
432 | |
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433 virtual void work(unsigned int work_id) { |
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434 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 435 // Simplest first cut: static partitioning. |
436 int index = work_id; | |
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437 // The increment on "index" must correspond to the maximum number of queues |
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438 // (n_queues) with which that ReferenceProcessor was created. That |
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439 // is because of the "clever" way the discovered references lists were |
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440 // allocated and are indexed into. |
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441 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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442 for (int j = 0; |
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443 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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444 j++, index += _n_queues) { |
0 | 445 _ref_processor.enqueue_discovered_reflist( |
446 _refs_lists[index], _pending_list_addr); | |
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447 _refs_lists[index].set_head(NULL); |
0 | 448 _refs_lists[index].set_length(0); |
449 } | |
450 } | |
451 }; | |
452 | |
453 // Enqueue references that are not made active again | |
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454 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 455 AbstractRefProcTaskExecutor* task_executor) { |
456 if (_processing_is_mt && task_executor != NULL) { | |
457 // Parallel code | |
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458 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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459 pending_list_addr, _max_num_q); |
0 | 460 task_executor->execute(tsk); |
461 } else { | |
462 // Serial code: call the parent class's implementation | |
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463 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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464 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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465 _discovered_refs[i].set_head(NULL); |
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466 _discovered_refs[i].set_length(0); |
0 | 467 } |
468 } | |
469 } | |
470 | |
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471 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 472 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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473 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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474 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 475 "discovered field is bad"); |
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476 _next = discovered; |
0 | 477 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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478 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 479 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
480 "Wrong oop found in java.lang.Reference object"); | |
481 assert(allow_null_referent ? | |
482 _referent->is_oop_or_null() | |
483 : _referent->is_oop(), | |
484 "bad referent"); | |
485 } | |
486 | |
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487 void DiscoveredListIterator::remove() { |
0 | 488 assert(_ref->is_oop(), "Dropping a bad reference"); |
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489 oop_store_raw(_discovered_addr, NULL); |
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490 |
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491 // First _prev_next ref actually points into DiscoveredList (gross). |
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492 oop new_next; |
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493 if (_next == _ref) { |
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494 // At the end of the list, we should make _prev point to itself. |
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495 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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496 // and _prev will be NULL. |
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497 new_next = _prev; |
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498 } else { |
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499 new_next = _next; |
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500 } |
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501 // Remove Reference object from discovered list. Note that G1 does not need a |
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502 // pre-barrier here because we know the Reference has already been found/marked, |
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503 // that's how it ended up in the discovered list in the first place. |
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504 oop_store_raw(_prev_next, new_next); |
0 | 505 NOT_PRODUCT(_removed++); |
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506 _refs_list.dec_length(1); |
0 | 507 } |
508 | |
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509 // Make the Reference object active again. |
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510 void DiscoveredListIterator::make_active() { |
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511 // The pre barrier for G1 is probably just needed for the old |
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512 // reference processing behavior. Should we guard this with |
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513 // ReferenceProcessor::pending_list_uses_discovered_field() ? |
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514 if (UseG1GC) { |
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515 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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516 if (UseCompressedOops) { |
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517 oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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518 } else { |
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519 oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
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520 } |
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521 } |
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522 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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523 } |
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524 |
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525 void DiscoveredListIterator::clear_referent() { |
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526 oop_store_raw(_referent_addr, NULL); |
0 | 527 } |
528 | |
529 // NOTE: process_phase*() are largely similar, and at a high level | |
530 // merely iterate over the extant list applying a predicate to | |
531 // each of its elements and possibly removing that element from the | |
532 // list and applying some further closures to that element. | |
533 // We should consider the possibility of replacing these | |
534 // process_phase*() methods by abstracting them into | |
535 // a single general iterator invocation that receives appropriate | |
536 // closures that accomplish this work. | |
537 | |
538 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
539 // referents are not alive, but that should be kept alive for policy reasons. | |
540 // Keep alive the transitive closure of all such referents. | |
541 void | |
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542 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 543 ReferencePolicy* policy, |
544 BoolObjectClosure* is_alive, | |
545 OopClosure* keep_alive, | |
546 VoidClosure* complete_gc) { | |
547 assert(policy != NULL, "Must have a non-NULL policy"); | |
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548 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 549 // Decide which softly reachable refs should be kept alive. |
550 while (iter.has_next()) { | |
551 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
552 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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553 if (referent_is_dead && |
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554 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 555 if (TraceReferenceGC) { |
556 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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557 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 558 } |
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559 // Remove Reference object from list |
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560 iter.remove(); |
0 | 561 // Make the Reference object active again |
562 iter.make_active(); | |
563 // keep the referent around | |
564 iter.make_referent_alive(); | |
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565 iter.move_to_next(); |
0 | 566 } else { |
567 iter.next(); | |
568 } | |
569 } | |
570 // Close the reachable set | |
571 complete_gc->do_void(); | |
572 NOT_PRODUCT( | |
573 if (PrintGCDetails && TraceReferenceGC) { | |
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574 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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575 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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576 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 577 } |
578 ) | |
579 } | |
580 | |
581 // Traverse the list and remove any Refs that are not active, or | |
582 // whose referents are either alive or NULL. | |
583 void | |
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584 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 585 BoolObjectClosure* is_alive, |
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586 OopClosure* keep_alive) { |
0 | 587 assert(discovery_is_atomic(), "Error"); |
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588 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 589 while (iter.has_next()) { |
590 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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591 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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592 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 593 if (iter.is_referent_alive()) { |
594 if (TraceReferenceGC) { | |
595 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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596 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 597 } |
598 // The referent is reachable after all. | |
452
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599 // Remove Reference object from list. |
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600 iter.remove(); |
0 | 601 // Update the referent pointer as necessary: Note that this |
602 // should not entail any recursive marking because the | |
603 // referent must already have been traversed. | |
604 iter.make_referent_alive(); | |
452
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605 iter.move_to_next(); |
0 | 606 } else { |
607 iter.next(); | |
608 } | |
609 } | |
610 NOT_PRODUCT( | |
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611 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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612 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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613 "Refs in discovered list " INTPTR_FORMAT, |
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614 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 615 } |
616 ) | |
617 } | |
618 | |
619 void | |
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620 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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621 BoolObjectClosure* is_alive, |
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622 OopClosure* keep_alive, |
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623 VoidClosure* complete_gc) { |
0 | 624 assert(!discovery_is_atomic(), "Error"); |
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625 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 626 while (iter.has_next()) { |
627 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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628 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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629 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 630 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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631 next != NULL)) { |
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632 assert(next->is_oop_or_null(), "bad next field"); |
0 | 633 // Remove Reference object from list |
634 iter.remove(); | |
635 // Trace the cohorts | |
636 iter.make_referent_alive(); | |
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637 if (UseCompressedOops) { |
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638 keep_alive->do_oop((narrowOop*)next_addr); |
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639 } else { |
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640 keep_alive->do_oop((oop*)next_addr); |
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641 } |
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642 iter.move_to_next(); |
0 | 643 } else { |
644 iter.next(); | |
645 } | |
646 } | |
647 // Now close the newly reachable set | |
648 complete_gc->do_void(); | |
649 NOT_PRODUCT( | |
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650 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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651 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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652 "Refs in discovered list " INTPTR_FORMAT, |
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653 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 654 } |
655 ) | |
656 } | |
657 | |
658 // Traverse the list and process the referents, by either | |
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659 // clearing them or keeping them (and their reachable |
0 | 660 // closure) alive. |
661 void | |
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662 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 663 bool clear_referent, |
664 BoolObjectClosure* is_alive, | |
665 OopClosure* keep_alive, | |
666 VoidClosure* complete_gc) { | |
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667 ResourceMark rm; |
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668 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 669 while (iter.has_next()) { |
670 iter.update_discovered(); | |
671 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
672 if (clear_referent) { | |
673 // NULL out referent pointer | |
674 iter.clear_referent(); | |
675 } else { | |
676 // keep the referent around | |
677 iter.make_referent_alive(); | |
678 } | |
679 if (TraceReferenceGC) { | |
680 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
681 clear_referent ? "cleared " : "", | |
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682 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 683 } |
684 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
685 iter.next(); | |
686 } | |
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687 // Remember to update the next pointer of the last ref. |
0 | 688 iter.update_discovered(); |
689 // Close the reachable set | |
690 complete_gc->do_void(); | |
691 } | |
692 | |
693 void | |
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694 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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695 oop obj = NULL; |
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696 oop next = refs_list.head(); |
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697 while (next != obj) { |
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698 obj = next; |
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699 next = java_lang_ref_Reference::discovered(obj); |
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700 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 701 } |
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702 refs_list.set_head(NULL); |
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703 refs_list.set_length(0); |
0 | 704 } |
705 | |
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706 void |
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707 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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708 clear_discovered_references(refs_list); |
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709 } |
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710 |
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711 void ReferenceProcessor::abandon_partial_discovery() { |
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712 // loop over the lists |
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713 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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714 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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715 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
342
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716 } |
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717 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 718 } |
719 } | |
720 | |
721 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
722 public: | |
723 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
724 DiscoveredList refs_lists[], | |
725 ReferencePolicy* policy, | |
726 bool marks_oops_alive) | |
727 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
728 _policy(policy) | |
729 { } | |
730 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
731 OopClosure& keep_alive, | |
732 VoidClosure& complete_gc) | |
733 { | |
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734 Thread* thr = Thread::current(); |
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735 int refs_list_index = ((WorkerThread*)thr)->id(); |
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736 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 737 &is_alive, &keep_alive, &complete_gc); |
738 } | |
739 private: | |
740 ReferencePolicy* _policy; | |
741 }; | |
742 | |
743 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
744 public: | |
745 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
746 DiscoveredList refs_lists[], | |
747 bool marks_oops_alive) | |
748 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
749 { } | |
750 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
751 OopClosure& keep_alive, | |
752 VoidClosure& complete_gc) | |
753 { | |
754 _ref_processor.process_phase2(_refs_lists[i], | |
755 &is_alive, &keep_alive, &complete_gc); | |
756 } | |
757 }; | |
758 | |
759 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
760 public: | |
761 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
762 DiscoveredList refs_lists[], | |
763 bool clear_referent, | |
764 bool marks_oops_alive) | |
765 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
766 _clear_referent(clear_referent) | |
767 { } | |
768 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
769 OopClosure& keep_alive, | |
770 VoidClosure& complete_gc) | |
771 { | |
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772 // Don't use "refs_list_index" calculated in this way because |
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773 // balance_queues() has moved the Ref's into the first n queues. |
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774 // Thread* thr = Thread::current(); |
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775 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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776 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 777 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
778 &is_alive, &keep_alive, &complete_gc); | |
779 } | |
780 private: | |
781 bool _clear_referent; | |
782 }; | |
783 | |
784 // Balances reference queues. | |
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785 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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786 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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787 // corresponding to the active workers will be processed. |
0 | 788 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
789 { | |
790 // calculate total length | |
791 size_t total_refs = 0; | |
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792 if (TraceReferenceGC && PrintGCDetails) { |
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793 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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794 } |
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795 |
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796 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 797 total_refs += ref_lists[i].length(); |
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798 if (TraceReferenceGC && PrintGCDetails) { |
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799 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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800 } |
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801 } |
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802 if (TraceReferenceGC && PrintGCDetails) { |
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803 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 804 } |
805 size_t avg_refs = total_refs / _num_q + 1; | |
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806 uint to_idx = 0; |
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807 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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808 bool move_all = false; |
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809 if (from_idx >= _num_q) { |
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810 move_all = ref_lists[from_idx].length() > 0; |
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811 } |
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812 while ((ref_lists[from_idx].length() > avg_refs) || |
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813 move_all) { |
0 | 814 assert(to_idx < _num_q, "Sanity Check!"); |
815 if (ref_lists[to_idx].length() < avg_refs) { | |
816 // move superfluous refs | |
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817 size_t refs_to_move; |
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818 // Move all the Ref's if the from queue will not be processed. |
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819 if (move_all) { |
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820 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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821 avg_refs - ref_lists[to_idx].length()); |
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822 } else { |
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823 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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824 avg_refs - ref_lists[to_idx].length()); |
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825 } |
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826 |
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827 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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828 |
0 | 829 oop move_head = ref_lists[from_idx].head(); |
830 oop move_tail = move_head; | |
831 oop new_head = move_head; | |
832 // find an element to split the list on | |
833 for (size_t j = 0; j < refs_to_move; ++j) { | |
834 move_tail = new_head; | |
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835 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 836 } |
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837 |
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838 // Add the chain to the to list. |
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839 if (ref_lists[to_idx].head() == NULL) { |
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840 // to list is empty. Make a loop at the end. |
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841 java_lang_ref_Reference::set_discovered_raw(move_tail, move_tail); |
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842 } else { |
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843 java_lang_ref_Reference::set_discovered_raw(move_tail, ref_lists[to_idx].head()); |
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844 } |
0 | 845 ref_lists[to_idx].set_head(move_head); |
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846 ref_lists[to_idx].inc_length(refs_to_move); |
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847 |
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848 // Remove the chain from the from list. |
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849 if (move_tail == new_head) { |
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850 // We found the end of the from list. |
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851 ref_lists[from_idx].set_head(NULL); |
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852 } else { |
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853 ref_lists[from_idx].set_head(new_head); |
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854 } |
452
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855 ref_lists[from_idx].dec_length(refs_to_move); |
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856 if (ref_lists[from_idx].length() == 0) { |
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857 break; |
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858 } |
0 | 859 } else { |
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860 to_idx = (to_idx + 1) % _num_q; |
0 | 861 } |
862 } | |
863 } | |
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864 #ifdef ASSERT |
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865 size_t balanced_total_refs = 0; |
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866 for (uint i = 0; i < _max_num_q; ++i) { |
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867 balanced_total_refs += ref_lists[i].length(); |
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868 if (TraceReferenceGC && PrintGCDetails) { |
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869 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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870 } |
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871 } |
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872 if (TraceReferenceGC && PrintGCDetails) { |
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873 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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874 gclog_or_tty->flush(); |
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875 } |
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876 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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877 #endif |
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878 } |
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879 |
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880 void ReferenceProcessor::balance_all_queues() { |
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881 balance_queues(_discoveredSoftRefs); |
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882 balance_queues(_discoveredWeakRefs); |
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883 balance_queues(_discoveredFinalRefs); |
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884 balance_queues(_discoveredPhantomRefs); |
0 | 885 } |
886 | |
10405 | 887 size_t |
0 | 888 ReferenceProcessor::process_discovered_reflist( |
889 DiscoveredList refs_lists[], | |
890 ReferencePolicy* policy, | |
891 bool clear_referent, | |
892 BoolObjectClosure* is_alive, | |
893 OopClosure* keep_alive, | |
894 VoidClosure* complete_gc, | |
895 AbstractRefProcTaskExecutor* task_executor) | |
896 { | |
1833
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897 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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898 // If discovery used MT and a dynamic number of GC threads, then |
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899 // the queues must be balanced for correctness if fewer than the |
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900 // maximum number of queues were used. The number of queue used |
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901 // during discovery may be different than the number to be used |
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902 // for processing so don't depend of _num_q < _max_num_q as part |
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903 // of the test. |
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904 bool must_balance = _discovery_is_mt; |
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905 |
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906 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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907 must_balance) { |
0 | 908 balance_queues(refs_lists); |
909 } | |
10405 | 910 |
911 size_t total_list_count = total_count(refs_lists); | |
912 | |
0 | 913 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 914 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 915 } |
916 | |
917 // Phase 1 (soft refs only): | |
918 // . Traverse the list and remove any SoftReferences whose | |
919 // referents are not alive, but that should be kept alive for | |
920 // policy reasons. Keep alive the transitive closure of all | |
921 // such referents. | |
922 if (policy != NULL) { | |
1833
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923 if (mt_processing) { |
0 | 924 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
925 task_executor->execute(phase1); | |
926 } else { | |
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927 for (uint i = 0; i < _max_num_q; i++) { |
0 | 928 process_phase1(refs_lists[i], policy, |
929 is_alive, keep_alive, complete_gc); | |
930 } | |
931 } | |
932 } else { // policy == NULL | |
933 assert(refs_lists != _discoveredSoftRefs, | |
934 "Policy must be specified for soft references."); | |
935 } | |
936 | |
937 // Phase 2: | |
938 // . Traverse the list and remove any refs whose referents are alive. | |
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939 if (mt_processing) { |
0 | 940 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
941 task_executor->execute(phase2); | |
942 } else { | |
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943 for (uint i = 0; i < _max_num_q; i++) { |
0 | 944 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
945 } | |
946 } | |
947 | |
948 // Phase 3: | |
949 // . Traverse the list and process referents as appropriate. | |
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950 if (mt_processing) { |
0 | 951 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
952 task_executor->execute(phase3); | |
953 } else { | |
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954 for (uint i = 0; i < _max_num_q; i++) { |
0 | 955 process_phase3(refs_lists[i], clear_referent, |
956 is_alive, keep_alive, complete_gc); | |
957 } | |
958 } | |
10405 | 959 |
960 return total_list_count; | |
0 | 961 } |
962 | |
963 void ReferenceProcessor::clean_up_discovered_references() { | |
964 // loop over the lists | |
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965 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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966 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 967 gclog_or_tty->print_cr( |
968 "\nScrubbing %s discovered list of Null referents", | |
969 list_name(i)); | |
970 } | |
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971 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 972 } |
973 } | |
974 | |
975 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
976 assert(!discovery_is_atomic(), "Else why call this method?"); | |
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977 DiscoveredListIterator iter(refs_list, NULL, NULL); |
0 | 978 while (iter.has_next()) { |
979 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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980 oop next = java_lang_ref_Reference::next(iter.obj()); |
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981 assert(next->is_oop_or_null(), "bad next field"); |
0 | 982 // If referent has been cleared or Reference is not active, |
983 // drop it. | |
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984 if (iter.referent() == NULL || next != NULL) { |
0 | 985 debug_only( |
986 if (PrintGCDetails && TraceReferenceGC) { | |
987 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
988 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
989 " and referent: " INTPTR_FORMAT, | |
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990 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 991 } |
992 ) | |
993 // Remove Reference object from list | |
994 iter.remove(); | |
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995 iter.move_to_next(); |
0 | 996 } else { |
997 iter.next(); | |
998 } | |
999 } | |
1000 NOT_PRODUCT( | |
1001 if (PrintGCDetails && TraceReferenceGC) { | |
1002 gclog_or_tty->print( | |
1003 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1004 iter.removed(), iter.processed()); | |
1005 } | |
1006 ) | |
1007 } | |
1008 | |
1009 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1010 uint id = 0; |
0 | 1011 // Determine the queue index to use for this object. |
1012 if (_discovery_is_mt) { | |
1013 // During a multi-threaded discovery phase, | |
1014 // each thread saves to its "own" list. | |
1015 Thread* thr = Thread::current(); | |
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1016 id = thr->as_Worker_thread()->id(); |
0 | 1017 } else { |
1018 // single-threaded discovery, we save in round-robin | |
1019 // fashion to each of the lists. | |
1020 if (_processing_is_mt) { | |
1021 id = next_id(); | |
1022 } | |
1023 } | |
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1024 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1025 |
1026 // Get the discovered queue to which we will add | |
1027 DiscoveredList* list = NULL; | |
1028 switch (rt) { | |
1029 case REF_OTHER: | |
1030 // Unknown reference type, no special treatment | |
1031 break; | |
1032 case REF_SOFT: | |
1033 list = &_discoveredSoftRefs[id]; | |
1034 break; | |
1035 case REF_WEAK: | |
1036 list = &_discoveredWeakRefs[id]; | |
1037 break; | |
1038 case REF_FINAL: | |
1039 list = &_discoveredFinalRefs[id]; | |
1040 break; | |
1041 case REF_PHANTOM: | |
1042 list = &_discoveredPhantomRefs[id]; | |
1043 break; | |
1044 case REF_NONE: | |
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1045 // we should not reach here if we are an InstanceRefKlass |
0 | 1046 default: |
1047 ShouldNotReachHere(); | |
1048 } | |
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1049 if (TraceReferenceGC && PrintGCDetails) { |
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1050 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1051 } |
0 | 1052 return list; |
1053 } | |
1054 | |
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1055 inline void |
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1056 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1057 oop obj, |
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1058 HeapWord* discovered_addr) { |
0 | 1059 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1060 // First we must make sure this object is only enqueued once. CAS in a non null | |
1061 // discovered_addr. | |
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1062 oop current_head = refs_list.head(); |
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1063 // The last ref must have its discovered field pointing to itself. |
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1064 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1065 |
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1066 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1067 NULL); |
0 | 1068 if (retest == NULL) { |
1069 // This thread just won the right to enqueue the object. | |
3917
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1070 // We have separate lists for enqueueing, so no synchronization |
0 | 1071 // is necessary. |
113
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1072 refs_list.set_head(obj); |
452
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1073 refs_list.inc_length(1); |
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1074 |
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1075 if (TraceReferenceGC) { |
3917
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1076 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
12316
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1077 (void *)obj, obj->klass()->internal_name()); |
1974
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1078 } |
0 | 1079 } else { |
1080 // If retest was non NULL, another thread beat us to it: | |
1081 // The reference has already been discovered... | |
1082 if (TraceReferenceGC) { | |
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1083 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
12316
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1084 (void *)obj, obj->klass()->internal_name()); |
0 | 1085 } |
1086 } | |
1087 } | |
1088 | |
1995
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1089 #ifndef PRODUCT |
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1090 // Non-atomic (i.e. concurrent) discovery might allow us |
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1091 // to observe j.l.References with NULL referents, being those |
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1092 // cleared concurrently by mutators during (or after) discovery. |
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1093 void ReferenceProcessor::verify_referent(oop obj) { |
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1094 bool da = discovery_is_atomic(); |
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1095 oop referent = java_lang_ref_Reference::referent(obj); |
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1096 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1097 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1098 INTPTR_FORMAT " during %satomic discovery ", |
12316
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1099 (void *)referent, (void *)obj, da ? "" : "non-")); |
1995
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1100 } |
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1101 #endif |
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1102 |
0 | 1103 // We mention two of several possible choices here: |
1104 // #0: if the reference object is not in the "originating generation" | |
1105 // (or part of the heap being collected, indicated by our "span" | |
1106 // we don't treat it specially (i.e. we scan it as we would | |
1107 // a normal oop, treating its references as strong references). | |
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1108 // This means that references can't be discovered unless their |
0 | 1109 // referent is also in the same span. This is the simplest, |
1110 // most "local" and most conservative approach, albeit one | |
1111 // that may cause weak references to be enqueued least promptly. | |
1112 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1113 // #1: the reference object may be in any generation (span), but if | |
1114 // the referent is in the generation (span) being currently collected | |
1115 // then we can discover the reference object, provided | |
1116 // the object has not already been discovered by | |
1117 // a different concurrently running collector (as may be the | |
1118 // case, for instance, if the reference object is in CMS and | |
1119 // the referent in DefNewGeneration), and provided the processing | |
1120 // of this reference object by the current collector will | |
1121 // appear atomic to every other collector in the system. | |
1122 // (Thus, for instance, a concurrent collector may not | |
1123 // discover references in other generations even if the | |
1124 // referent is in its own generation). This policy may, | |
1125 // in certain cases, enqueue references somewhat sooner than | |
1126 // might Policy #0 above, but at marginally increased cost | |
1127 // and complexity in processing these references. | |
1128 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1129 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1130 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1131 if (!_discovering_refs || !RegisterReferences) { |
1132 return false; | |
1133 } | |
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1134 // We only discover active references. |
113
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1135 oop next = java_lang_ref_Reference::next(obj); |
3917
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1136 if (next != NULL) { // Ref is no longer active |
0 | 1137 return false; |
1138 } | |
1139 | |
1140 HeapWord* obj_addr = (HeapWord*)obj; | |
1141 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1142 !_span.contains(obj_addr)) { | |
1143 // Reference is not in the originating generation; | |
1144 // don't treat it specially (i.e. we want to scan it as a normal | |
1145 // object with strong references). | |
1146 return false; | |
1147 } | |
1148 | |
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1149 // We only discover references whose referents are not (yet) |
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1150 // known to be strongly reachable. |
0 | 1151 if (is_alive_non_header() != NULL) { |
1995
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1152 verify_referent(obj); |
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1153 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1154 return false; // referent is reachable |
1155 } | |
1156 } | |
453
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1157 if (rt == REF_SOFT) { |
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1158 // For soft refs we can decide now if these are not |
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452
diff
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|
1159 // current candidates for clearing, in which case we |
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452
diff
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|
1160 // can mark through them now, rather than delaying that |
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diff
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|
1161 // to the reference-processing phase. Since all current |
c96030fff130
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diff
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|
1162 // time-stamp policies advance the soft-ref clock only |
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diff
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|
1163 // at a major collection cycle, this is always currently |
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|
1164 // accurate. |
3992
d1bdeef3e3e2
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3979
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|
1165 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
453
c96030fff130
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|
1166 return false; |
c96030fff130
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diff
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|
1167 } |
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diff
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|
1168 } |
0 | 1169 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3917
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|
1170 ResourceMark rm; // Needed for tracing. |
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|
1171 |
342
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1172 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1173 const oop discovered = java_lang_ref_Reference::discovered(obj); |
113
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1174 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1175 if (discovered != NULL) { |
0 | 1176 // The reference has already been discovered... |
1177 if (TraceReferenceGC) { | |
3917
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1178 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
12316
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|
1179 (void *)obj, obj->klass()->internal_name()); |
0 | 1180 } |
1181 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1182 // assumes that an object is not processed twice; | |
1183 // if it's been already discovered it must be on another | |
1184 // generation's discovered list; so we won't discover it. | |
1185 return false; | |
1186 } else { | |
1187 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1188 "Unrecognized policy"); | |
1189 // Check assumption that an object is not potentially | |
1190 // discovered twice except by concurrent collectors that potentially | |
1191 // trace the same Reference object twice. | |
1974
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|
1192 assert(UseConcMarkSweepGC || UseG1GC, |
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|
1193 "Only possible with a concurrent marking collector"); |
0 | 1194 return true; |
1195 } | |
1196 } | |
1197 | |
1198 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1995
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diff
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|
1199 verify_referent(obj); |
3917
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3915
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|
1200 // Discover if and only if EITHER: |
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3915
diff
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|
1201 // .. reference is in our span, OR |
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|
1202 // .. we are an atomic collector and referent is in our span |
0 | 1203 if (_span.contains(obj_addr) || |
1995
8df09fb45352
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
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diff
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|
1204 (discovery_is_atomic() && |
8df09fb45352
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
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diff
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|
1205 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1206 // should_enqueue = true; |
1207 } else { | |
1208 return false; | |
1209 } | |
1210 } else { | |
1211 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1212 _span.contains(obj_addr), "code inconsistency"); | |
1213 } | |
1214 | |
1215 // Get the right type of discovered queue head. | |
1216 DiscoveredList* list = get_discovered_list(rt); | |
1217 if (list == NULL) { | |
1218 return false; // nothing special needs to be done | |
1219 } | |
1220 | |
1221 if (_discovery_is_mt) { | |
1222 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1223 } else { | |
17976
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
17937
diff
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|
1224 // We do a raw store here: the field will be visited later when processing |
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
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|
1225 // the discovered references. |
342
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|
1226 oop current_head = list->head(); |
3915
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
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2369
diff
changeset
|
1227 // The last ref must have its discovered field pointing to itself. |
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
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2369
diff
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|
1228 oop next_discovered = (current_head != NULL) ? current_head : obj; |
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
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diff
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|
1229 |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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113
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|
1230 assert(discovered == NULL, "control point invariant"); |
3915
c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
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2369
diff
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|
1231 oop_store_raw(discovered_addr, next_discovered); |
0 | 1232 list->set_head(obj); |
452
00b023ae2d78
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|
1233 list->inc_length(1); |
0 | 1234 |
1974
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6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1972
diff
changeset
|
1235 if (TraceReferenceGC) { |
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
ysr
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3915
diff
changeset
|
1236 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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diff
changeset
|
1237 (void *)obj, obj->klass()->internal_name()); |
0 | 1238 } |
1239 } | |
3917
eca1193ca245
4965777: GC changes to support use of discovered field for pending references
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3915
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changeset
|
1240 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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1974
diff
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|
1241 verify_referent(obj); |
0 | 1242 return true; |
1243 } | |
1244 | |
1245 // Preclean the discovered references by removing those | |
1246 // whose referents are alive, and by marking from those that | |
1247 // are not active. These lists can be handled here | |
1248 // in any order and, indeed, concurrently. | |
1249 void ReferenceProcessor::preclean_discovered_references( | |
1250 BoolObjectClosure* is_alive, | |
1251 OopClosure* keep_alive, | |
1252 VoidClosure* complete_gc, | |
10405 | 1253 YieldClosure* yield, |
1254 GCTimer* gc_timer) { | |
0 | 1255 |
1256 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1257 | |
1258 // Soft references | |
1259 { | |
10405 | 1260 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
1261 false, gc_timer); | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4712
diff
changeset
|
1262 for (uint i = 0; i < _max_num_q; i++) { |
452
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1263 if (yield->should_return()) { |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1264 return; |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
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356
diff
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|
1265 } |
0 | 1266 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1267 keep_alive, complete_gc, yield); | |
1268 } | |
1269 } | |
1270 | |
1271 // Weak references | |
1272 { | |
10405 | 1273 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
1274 false, gc_timer); | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4712
diff
changeset
|
1275 for (uint i = 0; i < _max_num_q; i++) { |
452
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1276 if (yield->should_return()) { |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1277 return; |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1278 } |
0 | 1279 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1280 keep_alive, complete_gc, yield); | |
1281 } | |
1282 } | |
1283 | |
1284 // Final references | |
1285 { | |
10405 | 1286 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
1287 false, gc_timer); | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4712
diff
changeset
|
1288 for (uint i = 0; i < _max_num_q; i++) { |
452
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1289 if (yield->should_return()) { |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1290 return; |
00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
356
diff
changeset
|
1291 } |
0 | 1292 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1293 keep_alive, complete_gc, yield); | |
1294 } | |
1295 } | |
1296 | |
1297 // Phantom references | |
1298 { | |
10405 | 1299 GCTraceTime tt("Preclean PhantomReferences", 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(_discoveredPhantomRefs[i], is_alive, |
1306 keep_alive, complete_gc, yield); | |
1307 } | |
1308 } | |
1309 } | |
1310 | |
1311 // Walk the given discovered ref list, and remove all reference objects | |
1312 // whose referents are still alive, whose referents are NULL or which | |
452
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1313 // are not active (have a non-NULL next field). NOTE: When we are |
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1314 // thus precleaning the ref lists (which happens single-threaded today), |
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1315 // we do not disable refs discovery to honour the correct semantics of |
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1316 // java.lang.Reference. As a result, we need to be careful below |
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1317 // that ref removal steps interleave safely with ref discovery steps |
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1318 // (in this thread). |
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1319 void |
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1320 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1321 BoolObjectClosure* is_alive, |
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1322 OopClosure* keep_alive, |
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1323 VoidClosure* complete_gc, |
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1324 YieldClosure* yield) { |
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1325 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 1326 while (iter.has_next()) { |
1327 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1328 oop obj = iter.obj(); |
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1329 oop next = java_lang_ref_Reference::next(obj); |
0 | 1330 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1331 next != NULL) { |
0 | 1332 // The referent has been cleared, or is alive, or the Reference is not |
1333 // active; we need to trace and mark its cohort. | |
1334 if (TraceReferenceGC) { | |
1335 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1336 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1337 } |
1338 // Remove Reference object from list | |
1339 iter.remove(); | |
1340 // Keep alive its cohort. | |
1341 iter.make_referent_alive(); | |
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1342 if (UseCompressedOops) { |
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1343 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1344 keep_alive->do_oop(next_addr); |
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1345 } else { |
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1346 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1347 keep_alive->do_oop(next_addr); |
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1348 } |
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1349 iter.move_to_next(); |
0 | 1350 } else { |
1351 iter.next(); | |
1352 } | |
1353 } | |
1354 // Close the reachable set | |
1355 complete_gc->do_void(); | |
1356 | |
1357 NOT_PRODUCT( | |
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1358 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1359 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1360 "Refs in discovered list " INTPTR_FORMAT, |
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1361 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1362 } |
1363 ) | |
1364 } | |
1365 | |
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1366 const char* ReferenceProcessor::list_name(uint i) { |
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1367 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1368 "Out of bounds index"); |
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1369 |
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1370 int j = i / _max_num_q; |
0 | 1371 switch (j) { |
1372 case 0: return "SoftRef"; | |
1373 case 1: return "WeakRef"; | |
1374 case 2: return "FinalRef"; | |
1375 case 3: return "PhantomRef"; | |
1376 } | |
1377 ShouldNotReachHere(); | |
1378 return NULL; | |
1379 } | |
1380 | |
1381 #ifndef PRODUCT | |
1382 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1383 // empty for now | |
1384 } | |
1385 #endif | |
1386 | |
1387 #ifndef PRODUCT | |
1388 void ReferenceProcessor::clear_discovered_references() { | |
1389 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1390 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1391 clear_discovered_references(_discovered_refs[i]); |
0 | 1392 } |
1393 } | |
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1394 |
0 | 1395 #endif // PRODUCT |