Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 9202:b6629b739a55
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 22 Apr 2013 09:54:57 +0200 |
parents | aed758eda82a |
children | ebb32c4589f3 001ec9515f84 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "memory/referencePolicy.hpp" | |
31 #include "memory/referenceProcessor.hpp" | |
32 #include "oops/oop.inline.hpp" | |
33 #include "runtime/java.hpp" | |
34 #include "runtime/jniHandles.hpp" | |
0 | 35 |
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36 ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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37 ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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38 bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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39 jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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40 |
0 | 41 void referenceProcessor_init() { |
42 ReferenceProcessor::init_statics(); | |
43 } | |
44 | |
45 void ReferenceProcessor::init_statics() { | |
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46 // We need a monotonically non-deccreasing time in ms but |
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47 // os::javaTimeMillis() does not guarantee monotonicity. |
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48 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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49 |
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50 // Initialize the soft ref timestamp clock. |
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51 _soft_ref_timestamp_clock = now; |
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52 // Also update the soft ref clock in j.l.r.SoftReference |
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53 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 54 |
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55 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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56 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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57 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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58 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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59 vm_exit_during_initialization("Could not allocate reference policy object"); |
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60 } |
0 | 61 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
62 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
63 "Unrecongnized RefDiscoveryPolicy"); | |
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64 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 65 } |
66 | |
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67 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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68 #ifdef ASSERT |
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69 // Verify that we're not currently discovering refs |
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70 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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71 |
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72 if (check_no_refs) { |
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73 // Verify that the discovered lists are empty |
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74 verify_no_references_recorded(); |
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75 } |
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76 #endif // ASSERT |
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77 |
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78 // Someone could have modified the value of the static |
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79 // field in the j.l.r.SoftReference class that holds the |
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80 // soft reference timestamp clock using reflection or |
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81 // Unsafe between GCs. Unconditionally update the static |
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82 // field in ReferenceProcessor here so that we use the new |
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83 // value during reference discovery. |
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84 |
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85 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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86 _discovering_refs = true; |
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87 } |
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88 |
0 | 89 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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90 bool mt_processing, |
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91 uint mt_processing_degree, |
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92 bool mt_discovery, |
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93 uint mt_discovery_degree, |
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94 bool atomic_discovery, |
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95 BoolObjectClosure* is_alive_non_header, |
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96 bool discovered_list_needs_barrier) : |
0 | 97 _discovering_refs(false), |
98 _enqueuing_is_done(false), | |
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99 _is_alive_non_header(is_alive_non_header), |
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100 _discovered_list_needs_barrier(discovered_list_needs_barrier), |
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101 _bs(NULL), |
0 | 102 _processing_is_mt(mt_processing), |
103 _next_id(0) | |
104 { | |
105 _span = span; | |
106 _discovery_is_atomic = atomic_discovery; | |
107 _discovery_is_mt = mt_discovery; | |
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108 _num_q = MAX2(1U, mt_processing_degree); |
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109 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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110 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
6197 | 111 _max_num_q * number_of_subclasses_of_ref(), mtGC); |
112 | |
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113 if (_discovered_refs == NULL) { |
0 | 114 vm_exit_during_initialization("Could not allocated RefProc Array"); |
115 } | |
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116 _discoveredSoftRefs = &_discovered_refs[0]; |
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117 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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118 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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119 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
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120 |
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121 // Initialize all entries to NULL |
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122 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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123 _discovered_refs[i].set_head(NULL); |
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124 _discovered_refs[i].set_length(0); |
0 | 125 } |
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126 |
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127 // If we do barriers, cache a copy of the barrier set. |
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128 if (discovered_list_needs_barrier) { |
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129 _bs = Universe::heap()->barrier_set(); |
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130 } |
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131 setup_policy(false /* default soft ref policy */); |
0 | 132 } |
133 | |
134 #ifndef PRODUCT | |
135 void ReferenceProcessor::verify_no_references_recorded() { | |
136 guarantee(!_discovering_refs, "Discovering refs?"); | |
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137 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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138 guarantee(_discovered_refs[i].is_empty(), |
0 | 139 "Found non-empty discovered list"); |
140 } | |
141 } | |
142 #endif | |
143 | |
144 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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145 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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146 if (UseCompressedOops) { |
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147 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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148 } else { |
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149 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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150 } |
0 | 151 } |
152 } | |
153 | |
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154 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 155 // Update (advance) the soft ref master clock field. This must be done |
156 // after processing the soft ref list. | |
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157 |
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158 // We need a monotonically non-deccreasing time in ms but |
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159 // os::javaTimeMillis() does not guarantee monotonicity. |
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160 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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161 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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162 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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163 |
0 | 164 NOT_PRODUCT( |
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165 if (now < _soft_ref_timestamp_clock) { |
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166 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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167 _soft_ref_timestamp_clock, now); |
0 | 168 } |
169 ) | |
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170 // The values of now and _soft_ref_timestamp_clock are set using |
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171 // javaTimeNanos(), which is guaranteed to be monotonically |
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172 // non-decreasing provided the underlying platform provides such |
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173 // a time source (and it is bug free). |
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174 // In product mode, however, protect ourselves from non-monotonicty. |
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175 if (now > _soft_ref_timestamp_clock) { |
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176 _soft_ref_timestamp_clock = now; |
0 | 177 java_lang_ref_SoftReference::set_clock(now); |
178 } | |
179 // Else leave clock stalled at its old value until time progresses | |
180 // past clock value. | |
181 } | |
182 | |
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183 void ReferenceProcessor::process_discovered_references( |
0 | 184 BoolObjectClosure* is_alive, |
185 OopClosure* keep_alive, | |
186 VoidClosure* complete_gc, | |
187 AbstractRefProcTaskExecutor* task_executor) { | |
188 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
189 | |
190 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
191 // Stop treating discovered references specially. | |
192 disable_discovery(); | |
193 | |
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194 // If discovery was concurrent, someone could have modified |
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195 // the value of the static field in the j.l.r.SoftReference |
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196 // class that holds the soft reference timestamp clock using |
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197 // reflection or Unsafe between when discovery was enabled and |
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198 // now. Unconditionally update the static field in ReferenceProcessor |
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199 // here so that we use the new value during processing of the |
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200 // discovered soft refs. |
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201 |
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202 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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203 |
0 | 204 bool trace_time = PrintGCDetails && PrintReferenceGC; |
205 // Soft references | |
206 { | |
207 TraceTime tt("SoftReference", trace_time, false, gclog_or_tty); | |
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208 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, |
0 | 209 is_alive, keep_alive, complete_gc, task_executor); |
210 } | |
211 | |
212 update_soft_ref_master_clock(); | |
213 | |
214 // Weak references | |
215 { | |
216 TraceTime tt("WeakReference", trace_time, false, gclog_or_tty); | |
217 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
218 is_alive, keep_alive, complete_gc, task_executor); | |
219 } | |
220 | |
221 // Final references | |
222 { | |
223 TraceTime tt("FinalReference", trace_time, false, gclog_or_tty); | |
224 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
225 is_alive, keep_alive, complete_gc, task_executor); | |
226 } | |
227 | |
228 // Phantom references | |
229 { | |
230 TraceTime tt("PhantomReference", trace_time, false, gclog_or_tty); | |
231 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
232 is_alive, keep_alive, complete_gc, task_executor); | |
233 } | |
234 | |
235 // Weak global JNI references. It would make more sense (semantically) to | |
236 // traverse these simultaneously with the regular weak references above, but | |
237 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
238 // thus use JNI weak references to circumvent the phantom references and | |
239 // resurrect a "post-mortem" object. | |
240 { | |
241 TraceTime tt("JNI Weak Reference", trace_time, false, gclog_or_tty); | |
242 if (task_executor != NULL) { | |
243 task_executor->set_single_threaded_mode(); | |
244 } | |
245 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
246 } | |
247 } | |
248 | |
249 #ifndef PRODUCT | |
250 // Calculate the number of jni handles. | |
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251 uint ReferenceProcessor::count_jni_refs() { |
0 | 252 class AlwaysAliveClosure: public BoolObjectClosure { |
253 public: | |
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254 virtual bool do_object_b(oop obj) { return true; } |
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255 virtual void do_object(oop obj) { assert(false, "Don't call"); } |
0 | 256 }; |
257 | |
258 class CountHandleClosure: public OopClosure { | |
259 private: | |
260 int _count; | |
261 public: | |
262 CountHandleClosure(): _count(0) {} | |
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263 void do_oop(oop* unused) { _count++; } |
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264 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 265 int count() { return _count; } |
266 }; | |
267 CountHandleClosure global_handle_count; | |
268 AlwaysAliveClosure always_alive; | |
269 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
270 return global_handle_count.count(); | |
271 } | |
272 #endif | |
273 | |
274 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
275 OopClosure* keep_alive, | |
276 VoidClosure* complete_gc) { | |
277 #ifndef PRODUCT | |
278 if (PrintGCDetails && PrintReferenceGC) { | |
279 unsigned int count = count_jni_refs(); | |
280 gclog_or_tty->print(", %u refs", count); | |
281 } | |
282 #endif | |
283 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
284 complete_gc->do_void(); | |
285 } | |
286 | |
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287 |
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288 template <class T> |
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289 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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290 AbstractRefProcTaskExecutor* task_executor) { |
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291 |
0 | 292 // Remember old value of pending references list |
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293 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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294 T old_pending_list_value = *pending_list_addr; |
0 | 295 |
296 // Enqueue references that are not made active again, and | |
297 // clear the decks for the next collection (cycle). | |
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298 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
0 | 299 // Do the oop-check on pending_list_addr missed in |
300 // enqueue_discovered_reflist. We should probably | |
301 // do a raw oop_check so that future such idempotent | |
302 // oop_stores relying on the oop-check side-effect | |
303 // may be elided automatically and safely without | |
304 // affecting correctness. | |
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305 oop_store(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 306 |
307 // Stop treating discovered references specially. | |
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308 ref->disable_discovery(); |
0 | 309 |
310 // Return true if new pending references were added | |
311 return old_pending_list_value != *pending_list_addr; | |
312 } | |
313 | |
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314 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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315 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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316 if (UseCompressedOops) { |
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317 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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318 } else { |
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319 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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320 } |
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321 } |
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322 |
0 | 323 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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324 HeapWord* pending_list_addr) { |
0 | 325 // Given a list of refs linked through the "discovered" field |
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326 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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327 // thus distinguishing them from active References, then |
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328 // prepend them to the pending list. |
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329 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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330 // the "next" field is used to chain the pending list, not the discovered |
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331 // field. |
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332 |
0 | 333 if (TraceReferenceGC && PrintGCDetails) { |
334 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
335 INTPTR_FORMAT, (address)refs_list.head()); | |
336 } | |
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337 |
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338 oop obj = NULL; |
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339 oop next_d = refs_list.head(); |
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340 if (pending_list_uses_discovered_field()) { // New behaviour |
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341 // Walk down the list, self-looping the next field |
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342 // so that the References are not considered active. |
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343 while (obj != next_d) { |
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344 obj = next_d; |
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345 assert(obj->is_instanceRef(), "should be reference object"); |
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346 next_d = java_lang_ref_Reference::discovered(obj); |
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347 if (TraceReferenceGC && PrintGCDetails) { |
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348 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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349 obj, next_d); |
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350 } |
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351 assert(java_lang_ref_Reference::next(obj) == NULL, |
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352 "Reference not active; should not be discovered"); |
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353 // Self-loop next, so as to make Ref not active. |
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354 java_lang_ref_Reference::set_next(obj, obj); |
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355 if (next_d == obj) { // obj is last |
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356 // Swap refs_list into pendling_list_addr and |
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357 // set obj's discovered to what we read from pending_list_addr. |
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358 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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359 // Need oop_check on pending_list_addr above; |
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360 // see special oop-check code at the end of |
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361 // enqueue_discovered_reflists() further below. |
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362 java_lang_ref_Reference::set_discovered(obj, old); // old may be NULL |
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363 } |
0 | 364 } |
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365 } else { // Old behaviour |
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366 // Walk down the list, copying the discovered field into |
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367 // the next field and clearing the discovered field. |
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368 while (obj != next_d) { |
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369 obj = next_d; |
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370 assert(obj->is_instanceRef(), "should be reference object"); |
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371 next_d = java_lang_ref_Reference::discovered(obj); |
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372 if (TraceReferenceGC && PrintGCDetails) { |
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373 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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374 obj, next_d); |
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375 } |
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376 assert(java_lang_ref_Reference::next(obj) == NULL, |
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377 "The reference should not be enqueued"); |
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378 if (next_d == obj) { // obj is last |
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379 // Swap refs_list into pendling_list_addr and |
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380 // set obj's next 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 oop_check on pending_list_addr above; |
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383 // see special oop-check code at the end of |
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384 // enqueue_discovered_reflists() further below. |
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385 if (old == NULL) { |
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386 // obj should be made to point to itself, since |
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387 // pending list was empty. |
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388 java_lang_ref_Reference::set_next(obj, obj); |
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389 } else { |
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390 java_lang_ref_Reference::set_next(obj, old); |
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391 } |
0 | 392 } else { |
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393 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 394 } |
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395 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 396 } |
397 } | |
398 } | |
399 | |
400 // Parallel enqueue task | |
401 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
402 public: | |
403 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
404 DiscoveredList discovered_refs[], | |
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405 HeapWord* pending_list_addr, |
0 | 406 int n_queues) |
407 : EnqueueTask(ref_processor, discovered_refs, | |
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408 pending_list_addr, n_queues) |
0 | 409 { } |
410 | |
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411 virtual void work(unsigned int work_id) { |
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412 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 413 // Simplest first cut: static partitioning. |
414 int index = work_id; | |
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415 // The increment on "index" must correspond to the maximum number of queues |
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416 // (n_queues) with which that ReferenceProcessor was created. That |
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417 // is because of the "clever" way the discovered references lists were |
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418 // allocated and are indexed into. |
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419 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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420 for (int j = 0; |
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421 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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422 j++, index += _n_queues) { |
0 | 423 _ref_processor.enqueue_discovered_reflist( |
424 _refs_lists[index], _pending_list_addr); | |
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425 _refs_lists[index].set_head(NULL); |
0 | 426 _refs_lists[index].set_length(0); |
427 } | |
428 } | |
429 }; | |
430 | |
431 // Enqueue references that are not made active again | |
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432 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 433 AbstractRefProcTaskExecutor* task_executor) { |
434 if (_processing_is_mt && task_executor != NULL) { | |
435 // Parallel code | |
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436 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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437 pending_list_addr, _max_num_q); |
0 | 438 task_executor->execute(tsk); |
439 } else { | |
440 // Serial code: call the parent class's implementation | |
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441 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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442 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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443 _discovered_refs[i].set_head(NULL); |
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444 _discovered_refs[i].set_length(0); |
0 | 445 } |
446 } | |
447 } | |
448 | |
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449 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 450 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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451 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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452 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 453 "discovered field is bad"); |
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454 _next = discovered; |
0 | 455 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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456 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 457 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
458 "Wrong oop found in java.lang.Reference object"); | |
459 assert(allow_null_referent ? | |
460 _referent->is_oop_or_null() | |
461 : _referent->is_oop(), | |
462 "bad referent"); | |
463 } | |
464 | |
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465 void DiscoveredListIterator::remove() { |
0 | 466 assert(_ref->is_oop(), "Dropping a bad reference"); |
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467 oop_store_raw(_discovered_addr, NULL); |
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468 |
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469 // First _prev_next ref actually points into DiscoveredList (gross). |
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470 oop new_next; |
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471 if (_next == _ref) { |
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472 // At the end of the list, we should make _prev point to itself. |
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473 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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474 // and _prev will be NULL. |
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475 new_next = _prev; |
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476 } else { |
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477 new_next = _next; |
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478 } |
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479 |
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480 if (UseCompressedOops) { |
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481 // Remove Reference object from list. |
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482 oopDesc::encode_store_heap_oop((narrowOop*)_prev_next, new_next); |
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483 } else { |
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484 // Remove Reference object from list. |
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485 oopDesc::store_heap_oop((oop*)_prev_next, new_next); |
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486 } |
0 | 487 NOT_PRODUCT(_removed++); |
452
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488 _refs_list.dec_length(1); |
0 | 489 } |
490 | |
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491 // Make the Reference object active again. |
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492 void DiscoveredListIterator::make_active() { |
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493 // For G1 we don't want to use set_next - it |
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494 // will dirty the card for the next field of |
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495 // the reference object and will fail |
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496 // CT verification. |
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497 if (UseG1GC) { |
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498 BarrierSet* bs = oopDesc::bs(); |
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499 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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500 |
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501 if (UseCompressedOops) { |
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502 bs->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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503 } else { |
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504 bs->write_ref_field_pre((oop*)next_addr, NULL); |
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505 } |
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506 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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507 } else { |
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508 java_lang_ref_Reference::set_next(_ref, NULL); |
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509 } |
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510 } |
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511 |
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512 void DiscoveredListIterator::clear_referent() { |
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513 oop_store_raw(_referent_addr, NULL); |
0 | 514 } |
515 | |
516 // NOTE: process_phase*() are largely similar, and at a high level | |
517 // merely iterate over the extant list applying a predicate to | |
518 // each of its elements and possibly removing that element from the | |
519 // list and applying some further closures to that element. | |
520 // We should consider the possibility of replacing these | |
521 // process_phase*() methods by abstracting them into | |
522 // a single general iterator invocation that receives appropriate | |
523 // closures that accomplish this work. | |
524 | |
525 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
526 // referents are not alive, but that should be kept alive for policy reasons. | |
527 // Keep alive the transitive closure of all such referents. | |
528 void | |
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529 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 530 ReferencePolicy* policy, |
531 BoolObjectClosure* is_alive, | |
532 OopClosure* keep_alive, | |
533 VoidClosure* complete_gc) { | |
534 assert(policy != NULL, "Must have a non-NULL policy"); | |
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535 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 536 // Decide which softly reachable refs should be kept alive. |
537 while (iter.has_next()) { | |
538 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
539 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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540 if (referent_is_dead && |
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541 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 542 if (TraceReferenceGC) { |
543 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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544 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 545 } |
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546 // Remove Reference object from list |
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547 iter.remove(); |
0 | 548 // Make the Reference object active again |
549 iter.make_active(); | |
550 // keep the referent around | |
551 iter.make_referent_alive(); | |
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552 iter.move_to_next(); |
0 | 553 } else { |
554 iter.next(); | |
555 } | |
556 } | |
557 // Close the reachable set | |
558 complete_gc->do_void(); | |
559 NOT_PRODUCT( | |
560 if (PrintGCDetails && TraceReferenceGC) { | |
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561 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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562 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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563 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 564 } |
565 ) | |
566 } | |
567 | |
568 // Traverse the list and remove any Refs that are not active, or | |
569 // whose referents are either alive or NULL. | |
570 void | |
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571 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 572 BoolObjectClosure* is_alive, |
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573 OopClosure* keep_alive) { |
0 | 574 assert(discovery_is_atomic(), "Error"); |
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575 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 576 while (iter.has_next()) { |
577 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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578 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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579 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 580 if (iter.is_referent_alive()) { |
581 if (TraceReferenceGC) { | |
582 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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583 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 584 } |
585 // The referent is reachable after all. | |
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586 // Remove Reference object from list. |
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587 iter.remove(); |
0 | 588 // Update the referent pointer as necessary: Note that this |
589 // should not entail any recursive marking because the | |
590 // referent must already have been traversed. | |
591 iter.make_referent_alive(); | |
452
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592 iter.move_to_next(); |
0 | 593 } else { |
594 iter.next(); | |
595 } | |
596 } | |
597 NOT_PRODUCT( | |
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598 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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599 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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600 "Refs in discovered list " INTPTR_FORMAT, |
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601 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 602 } |
603 ) | |
604 } | |
605 | |
606 void | |
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607 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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608 BoolObjectClosure* is_alive, |
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609 OopClosure* keep_alive, |
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610 VoidClosure* complete_gc) { |
0 | 611 assert(!discovery_is_atomic(), "Error"); |
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612 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 613 while (iter.has_next()) { |
614 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
113
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615 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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616 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 617 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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618 next != NULL)) { |
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619 assert(next->is_oop_or_null(), "bad next field"); |
0 | 620 // Remove Reference object from list |
621 iter.remove(); | |
622 // Trace the cohorts | |
623 iter.make_referent_alive(); | |
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624 if (UseCompressedOops) { |
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625 keep_alive->do_oop((narrowOop*)next_addr); |
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626 } else { |
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627 keep_alive->do_oop((oop*)next_addr); |
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628 } |
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629 iter.move_to_next(); |
0 | 630 } else { |
631 iter.next(); | |
632 } | |
633 } | |
634 // Now close the newly reachable set | |
635 complete_gc->do_void(); | |
636 NOT_PRODUCT( | |
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637 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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638 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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639 "Refs in discovered list " INTPTR_FORMAT, |
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640 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 641 } |
642 ) | |
643 } | |
644 | |
645 // Traverse the list and process the referents, by either | |
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646 // clearing them or keeping them (and their reachable |
0 | 647 // closure) alive. |
648 void | |
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649 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 650 bool clear_referent, |
651 BoolObjectClosure* is_alive, | |
652 OopClosure* keep_alive, | |
653 VoidClosure* complete_gc) { | |
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654 ResourceMark rm; |
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655 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 656 while (iter.has_next()) { |
657 iter.update_discovered(); | |
658 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
659 if (clear_referent) { | |
660 // NULL out referent pointer | |
661 iter.clear_referent(); | |
662 } else { | |
663 // keep the referent around | |
664 iter.make_referent_alive(); | |
665 } | |
666 if (TraceReferenceGC) { | |
667 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
668 clear_referent ? "cleared " : "", | |
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669 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 670 } |
671 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
672 iter.next(); | |
673 } | |
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674 // Remember to update the next pointer of the last ref. |
0 | 675 iter.update_discovered(); |
676 // Close the reachable set | |
677 complete_gc->do_void(); | |
678 } | |
679 | |
680 void | |
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681 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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682 oop obj = NULL; |
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683 oop next = refs_list.head(); |
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684 while (next != obj) { |
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685 obj = next; |
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686 next = java_lang_ref_Reference::discovered(obj); |
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687 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 688 } |
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689 refs_list.set_head(NULL); |
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690 refs_list.set_length(0); |
0 | 691 } |
692 | |
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693 void |
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694 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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695 clear_discovered_references(refs_list); |
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696 } |
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697 |
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698 void ReferenceProcessor::abandon_partial_discovery() { |
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699 // loop over the lists |
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700 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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701 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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702 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
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703 } |
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704 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 705 } |
706 } | |
707 | |
708 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
709 public: | |
710 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
711 DiscoveredList refs_lists[], | |
712 ReferencePolicy* policy, | |
713 bool marks_oops_alive) | |
714 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
715 _policy(policy) | |
716 { } | |
717 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
718 OopClosure& keep_alive, | |
719 VoidClosure& complete_gc) | |
720 { | |
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721 Thread* thr = Thread::current(); |
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722 int refs_list_index = ((WorkerThread*)thr)->id(); |
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723 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 724 &is_alive, &keep_alive, &complete_gc); |
725 } | |
726 private: | |
727 ReferencePolicy* _policy; | |
728 }; | |
729 | |
730 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
731 public: | |
732 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
733 DiscoveredList refs_lists[], | |
734 bool marks_oops_alive) | |
735 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
736 { } | |
737 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
738 OopClosure& keep_alive, | |
739 VoidClosure& complete_gc) | |
740 { | |
741 _ref_processor.process_phase2(_refs_lists[i], | |
742 &is_alive, &keep_alive, &complete_gc); | |
743 } | |
744 }; | |
745 | |
746 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
747 public: | |
748 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
749 DiscoveredList refs_lists[], | |
750 bool clear_referent, | |
751 bool marks_oops_alive) | |
752 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
753 _clear_referent(clear_referent) | |
754 { } | |
755 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
756 OopClosure& keep_alive, | |
757 VoidClosure& complete_gc) | |
758 { | |
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759 // Don't use "refs_list_index" calculated in this way because |
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760 // balance_queues() has moved the Ref's into the first n queues. |
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761 // Thread* thr = Thread::current(); |
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762 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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763 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 764 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
765 &is_alive, &keep_alive, &complete_gc); | |
766 } | |
767 private: | |
768 bool _clear_referent; | |
769 }; | |
770 | |
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771 void ReferenceProcessor::set_discovered(oop ref, oop value) { |
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772 if (_discovered_list_needs_barrier) { |
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773 java_lang_ref_Reference::set_discovered(ref, value); |
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774 } else { |
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775 java_lang_ref_Reference::set_discovered_raw(ref, value); |
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776 } |
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777 } |
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778 |
0 | 779 // Balances reference queues. |
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780 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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781 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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782 // corresponding to the active workers will be processed. |
0 | 783 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
784 { | |
785 // calculate total length | |
786 size_t total_refs = 0; | |
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787 if (TraceReferenceGC && PrintGCDetails) { |
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788 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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789 } |
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790 |
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791 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 792 total_refs += ref_lists[i].length(); |
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793 if (TraceReferenceGC && PrintGCDetails) { |
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794 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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795 } |
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796 } |
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797 if (TraceReferenceGC && PrintGCDetails) { |
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798 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 799 } |
800 size_t avg_refs = total_refs / _num_q + 1; | |
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801 uint to_idx = 0; |
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802 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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803 bool move_all = false; |
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804 if (from_idx >= _num_q) { |
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805 move_all = ref_lists[from_idx].length() > 0; |
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806 } |
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807 while ((ref_lists[from_idx].length() > avg_refs) || |
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808 move_all) { |
0 | 809 assert(to_idx < _num_q, "Sanity Check!"); |
810 if (ref_lists[to_idx].length() < avg_refs) { | |
811 // move superfluous refs | |
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812 size_t refs_to_move; |
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813 // Move all the Ref's if the from queue will not be processed. |
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814 if (move_all) { |
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815 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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816 avg_refs - ref_lists[to_idx].length()); |
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817 } else { |
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818 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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819 avg_refs - ref_lists[to_idx].length()); |
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820 } |
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821 |
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822 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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823 |
0 | 824 oop move_head = ref_lists[from_idx].head(); |
825 oop move_tail = move_head; | |
826 oop new_head = move_head; | |
827 // find an element to split the list on | |
828 for (size_t j = 0; j < refs_to_move; ++j) { | |
829 move_tail = new_head; | |
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830 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 831 } |
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832 |
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833 // Add the chain to the to list. |
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834 if (ref_lists[to_idx].head() == NULL) { |
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835 // to list is empty. Make a loop at the end. |
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836 set_discovered(move_tail, move_tail); |
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837 } else { |
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838 set_discovered(move_tail, ref_lists[to_idx].head()); |
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839 } |
0 | 840 ref_lists[to_idx].set_head(move_head); |
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841 ref_lists[to_idx].inc_length(refs_to_move); |
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842 |
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843 // Remove the chain from the from list. |
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844 if (move_tail == new_head) { |
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845 // We found the end of the from list. |
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846 ref_lists[from_idx].set_head(NULL); |
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847 } else { |
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848 ref_lists[from_idx].set_head(new_head); |
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849 } |
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850 ref_lists[from_idx].dec_length(refs_to_move); |
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851 if (ref_lists[from_idx].length() == 0) { |
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852 break; |
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853 } |
0 | 854 } else { |
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855 to_idx = (to_idx + 1) % _num_q; |
0 | 856 } |
857 } | |
858 } | |
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859 #ifdef ASSERT |
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860 size_t balanced_total_refs = 0; |
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861 for (uint i = 0; i < _max_num_q; ++i) { |
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862 balanced_total_refs += ref_lists[i].length(); |
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863 if (TraceReferenceGC && PrintGCDetails) { |
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864 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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865 } |
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866 } |
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867 if (TraceReferenceGC && PrintGCDetails) { |
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868 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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869 gclog_or_tty->flush(); |
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870 } |
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871 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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872 #endif |
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873 } |
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874 |
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875 void ReferenceProcessor::balance_all_queues() { |
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876 balance_queues(_discoveredSoftRefs); |
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877 balance_queues(_discoveredWeakRefs); |
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878 balance_queues(_discoveredFinalRefs); |
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879 balance_queues(_discoveredPhantomRefs); |
0 | 880 } |
881 | |
882 void | |
883 ReferenceProcessor::process_discovered_reflist( | |
884 DiscoveredList refs_lists[], | |
885 ReferencePolicy* policy, | |
886 bool clear_referent, | |
887 BoolObjectClosure* is_alive, | |
888 OopClosure* keep_alive, | |
889 VoidClosure* complete_gc, | |
890 AbstractRefProcTaskExecutor* task_executor) | |
891 { | |
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892 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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893 // If discovery used MT and a dynamic number of GC threads, then |
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894 // the queues must be balanced for correctness if fewer than the |
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895 // maximum number of queues were used. The number of queue used |
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896 // during discovery may be different than the number to be used |
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897 // for processing so don't depend of _num_q < _max_num_q as part |
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898 // of the test. |
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899 bool must_balance = _discovery_is_mt; |
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900 |
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901 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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902 must_balance) { |
0 | 903 balance_queues(refs_lists); |
904 } | |
905 if (PrintReferenceGC && PrintGCDetails) { | |
906 size_t total = 0; | |
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907 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 908 total += refs_lists[i].length(); |
909 } | |
910 gclog_or_tty->print(", %u refs", total); | |
911 } | |
912 | |
913 // Phase 1 (soft refs only): | |
914 // . Traverse the list and remove any SoftReferences whose | |
915 // referents are not alive, but that should be kept alive for | |
916 // policy reasons. Keep alive the transitive closure of all | |
917 // such referents. | |
918 if (policy != NULL) { | |
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919 if (mt_processing) { |
0 | 920 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
921 task_executor->execute(phase1); | |
922 } else { | |
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923 for (uint i = 0; i < _max_num_q; i++) { |
0 | 924 process_phase1(refs_lists[i], policy, |
925 is_alive, keep_alive, complete_gc); | |
926 } | |
927 } | |
928 } else { // policy == NULL | |
929 assert(refs_lists != _discoveredSoftRefs, | |
930 "Policy must be specified for soft references."); | |
931 } | |
932 | |
933 // Phase 2: | |
934 // . Traverse the list and remove any refs whose referents are alive. | |
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935 if (mt_processing) { |
0 | 936 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
937 task_executor->execute(phase2); | |
938 } else { | |
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939 for (uint i = 0; i < _max_num_q; i++) { |
0 | 940 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
941 } | |
942 } | |
943 | |
944 // Phase 3: | |
945 // . Traverse the list and process referents as appropriate. | |
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946 if (mt_processing) { |
0 | 947 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
948 task_executor->execute(phase3); | |
949 } else { | |
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950 for (uint i = 0; i < _max_num_q; i++) { |
0 | 951 process_phase3(refs_lists[i], clear_referent, |
952 is_alive, keep_alive, complete_gc); | |
953 } | |
954 } | |
955 } | |
956 | |
957 void ReferenceProcessor::clean_up_discovered_references() { | |
958 // loop over the lists | |
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959 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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960 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 961 gclog_or_tty->print_cr( |
962 "\nScrubbing %s discovered list of Null referents", | |
963 list_name(i)); | |
964 } | |
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965 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 966 } |
967 } | |
968 | |
969 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
970 assert(!discovery_is_atomic(), "Else why call this method?"); | |
971 DiscoveredListIterator iter(refs_list, NULL, NULL); | |
972 while (iter.has_next()) { | |
973 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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974 oop next = java_lang_ref_Reference::next(iter.obj()); |
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975 assert(next->is_oop_or_null(), "bad next field"); |
0 | 976 // If referent has been cleared or Reference is not active, |
977 // drop it. | |
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978 if (iter.referent() == NULL || next != NULL) { |
0 | 979 debug_only( |
980 if (PrintGCDetails && TraceReferenceGC) { | |
981 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
982 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
983 " and referent: " INTPTR_FORMAT, | |
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984 iter.obj(), next, iter.referent()); |
0 | 985 } |
986 ) | |
987 // Remove Reference object from list | |
988 iter.remove(); | |
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989 iter.move_to_next(); |
0 | 990 } else { |
991 iter.next(); | |
992 } | |
993 } | |
994 NOT_PRODUCT( | |
995 if (PrintGCDetails && TraceReferenceGC) { | |
996 gclog_or_tty->print( | |
997 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
998 iter.removed(), iter.processed()); | |
999 } | |
1000 ) | |
1001 } | |
1002 | |
1003 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1004 uint id = 0; |
0 | 1005 // Determine the queue index to use for this object. |
1006 if (_discovery_is_mt) { | |
1007 // During a multi-threaded discovery phase, | |
1008 // each thread saves to its "own" list. | |
1009 Thread* thr = Thread::current(); | |
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1010 id = thr->as_Worker_thread()->id(); |
0 | 1011 } else { |
1012 // single-threaded discovery, we save in round-robin | |
1013 // fashion to each of the lists. | |
1014 if (_processing_is_mt) { | |
1015 id = next_id(); | |
1016 } | |
1017 } | |
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1018 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1019 |
1020 // Get the discovered queue to which we will add | |
1021 DiscoveredList* list = NULL; | |
1022 switch (rt) { | |
1023 case REF_OTHER: | |
1024 // Unknown reference type, no special treatment | |
1025 break; | |
1026 case REF_SOFT: | |
1027 list = &_discoveredSoftRefs[id]; | |
1028 break; | |
1029 case REF_WEAK: | |
1030 list = &_discoveredWeakRefs[id]; | |
1031 break; | |
1032 case REF_FINAL: | |
1033 list = &_discoveredFinalRefs[id]; | |
1034 break; | |
1035 case REF_PHANTOM: | |
1036 list = &_discoveredPhantomRefs[id]; | |
1037 break; | |
1038 case REF_NONE: | |
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1039 // we should not reach here if we are an InstanceRefKlass |
0 | 1040 default: |
1041 ShouldNotReachHere(); | |
1042 } | |
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1043 if (TraceReferenceGC && PrintGCDetails) { |
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1044 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1045 } |
0 | 1046 return list; |
1047 } | |
1048 | |
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1049 inline void |
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1050 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1051 oop obj, |
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1052 HeapWord* discovered_addr) { |
0 | 1053 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1054 // First we must make sure this object is only enqueued once. CAS in a non null | |
1055 // discovered_addr. | |
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1056 oop current_head = refs_list.head(); |
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1057 // The last ref must have its discovered field pointing to itself. |
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1058 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1059 |
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1060 // Note: In the case of G1, this specific pre-barrier is strictly |
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1061 // not necessary because the only case we are interested in |
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1062 // here is when *discovered_addr is NULL (see the CAS further below), |
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1063 // so this will expand to nothing. As a result, we have manually |
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1064 // elided this out for G1, but left in the test for some future |
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1065 // collector that might have need for a pre-barrier here, e.g.:- |
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1066 // _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1067 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1068 "Need to check non-G1 collector: " |
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1069 "may need a pre-write-barrier for CAS from NULL below"); |
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1070 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1071 NULL); |
0 | 1072 if (retest == NULL) { |
1073 // This thread just won the right to enqueue the object. | |
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1074 // We have separate lists for enqueueing, so no synchronization |
0 | 1075 // is necessary. |
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1076 refs_list.set_head(obj); |
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1077 refs_list.inc_length(1); |
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1078 if (_discovered_list_needs_barrier) { |
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1079 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1080 } |
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1081 |
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1082 if (TraceReferenceGC) { |
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1083 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1084 obj, obj->klass()->internal_name()); |
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1085 } |
0 | 1086 } else { |
1087 // If retest was non NULL, another thread beat us to it: | |
1088 // The reference has already been discovered... | |
1089 if (TraceReferenceGC) { | |
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1090 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1091 obj, obj->klass()->internal_name()); |
0 | 1092 } |
1093 } | |
1094 } | |
1095 | |
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1096 #ifndef PRODUCT |
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1097 // Non-atomic (i.e. concurrent) discovery might allow us |
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1098 // to observe j.l.References with NULL referents, being those |
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1099 // cleared concurrently by mutators during (or after) discovery. |
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1100 void ReferenceProcessor::verify_referent(oop obj) { |
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1101 bool da = discovery_is_atomic(); |
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1102 oop referent = java_lang_ref_Reference::referent(obj); |
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1103 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1104 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1105 INTPTR_FORMAT " during %satomic discovery ", |
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1106 (intptr_t)referent, (intptr_t)obj, da ? "" : "non-")); |
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1107 } |
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1108 #endif |
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1109 |
0 | 1110 // We mention two of several possible choices here: |
1111 // #0: if the reference object is not in the "originating generation" | |
1112 // (or part of the heap being collected, indicated by our "span" | |
1113 // we don't treat it specially (i.e. we scan it as we would | |
1114 // a normal oop, treating its references as strong references). | |
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1115 // This means that references can't be discovered unless their |
0 | 1116 // referent is also in the same span. This is the simplest, |
1117 // most "local" and most conservative approach, albeit one | |
1118 // that may cause weak references to be enqueued least promptly. | |
1119 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1120 // #1: the reference object may be in any generation (span), but if | |
1121 // the referent is in the generation (span) being currently collected | |
1122 // then we can discover the reference object, provided | |
1123 // the object has not already been discovered by | |
1124 // a different concurrently running collector (as may be the | |
1125 // case, for instance, if the reference object is in CMS and | |
1126 // the referent in DefNewGeneration), and provided the processing | |
1127 // of this reference object by the current collector will | |
1128 // appear atomic to every other collector in the system. | |
1129 // (Thus, for instance, a concurrent collector may not | |
1130 // discover references in other generations even if the | |
1131 // referent is in its own generation). This policy may, | |
1132 // in certain cases, enqueue references somewhat sooner than | |
1133 // might Policy #0 above, but at marginally increased cost | |
1134 // and complexity in processing these references. | |
1135 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1136 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1137 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1138 if (!_discovering_refs || !RegisterReferences) { |
1139 return false; | |
1140 } | |
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1141 // We only discover active references. |
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1142 oop next = java_lang_ref_Reference::next(obj); |
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1143 if (next != NULL) { // Ref is no longer active |
0 | 1144 return false; |
1145 } | |
1146 | |
1147 HeapWord* obj_addr = (HeapWord*)obj; | |
1148 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1149 !_span.contains(obj_addr)) { | |
1150 // Reference is not in the originating generation; | |
1151 // don't treat it specially (i.e. we want to scan it as a normal | |
1152 // object with strong references). | |
1153 return false; | |
1154 } | |
1155 | |
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1156 // We only discover references whose referents are not (yet) |
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1157 // known to be strongly reachable. |
0 | 1158 if (is_alive_non_header() != NULL) { |
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1159 verify_referent(obj); |
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1160 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1161 return false; // referent is reachable |
1162 } | |
1163 } | |
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1164 if (rt == REF_SOFT) { |
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1165 // For soft refs we can decide now if these are not |
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1166 // current candidates for clearing, in which case we |
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1167 // can mark through them now, rather than delaying that |
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1168 // to the reference-processing phase. Since all current |
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1169 // time-stamp policies advance the soft-ref clock only |
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1170 // at a major collection cycle, this is always currently |
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1171 // accurate. |
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1172 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
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1173 return false; |
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1174 } |
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1175 } |
0 | 1176 |
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1177 ResourceMark rm; // Needed for tracing. |
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1178 |
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1179 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1180 const oop discovered = java_lang_ref_Reference::discovered(obj); |
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1181 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1182 if (discovered != NULL) { |
0 | 1183 // The reference has already been discovered... |
1184 if (TraceReferenceGC) { | |
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1185 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1186 obj, obj->klass()->internal_name()); |
0 | 1187 } |
1188 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1189 // assumes that an object is not processed twice; | |
1190 // if it's been already discovered it must be on another | |
1191 // generation's discovered list; so we won't discover it. | |
1192 return false; | |
1193 } else { | |
1194 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1195 "Unrecognized policy"); | |
1196 // Check assumption that an object is not potentially | |
1197 // discovered twice except by concurrent collectors that potentially | |
1198 // trace the same Reference object twice. | |
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1199 assert(UseConcMarkSweepGC || UseG1GC, |
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1200 "Only possible with a concurrent marking collector"); |
0 | 1201 return true; |
1202 } | |
1203 } | |
1204 | |
1205 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1206 verify_referent(obj); |
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1207 // Discover if and only if EITHER: |
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1208 // .. reference is in our span, OR |
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1209 // .. we are an atomic collector and referent is in our span |
0 | 1210 if (_span.contains(obj_addr) || |
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1211 (discovery_is_atomic() && |
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1212 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1213 // should_enqueue = true; |
1214 } else { | |
1215 return false; | |
1216 } | |
1217 } else { | |
1218 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1219 _span.contains(obj_addr), "code inconsistency"); | |
1220 } | |
1221 | |
1222 // Get the right type of discovered queue head. | |
1223 DiscoveredList* list = get_discovered_list(rt); | |
1224 if (list == NULL) { | |
1225 return false; // nothing special needs to be done | |
1226 } | |
1227 | |
1228 if (_discovery_is_mt) { | |
1229 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1230 } else { | |
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1231 // If "_discovered_list_needs_barrier", we do write barriers when |
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1232 // updating the discovered reference list. Otherwise, we do a raw store |
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1233 // here: the field will be visited later when processing the discovered |
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1234 // references. |
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1235 oop current_head = list->head(); |
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1236 // The last ref must have its discovered field pointing to itself. |
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1237 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1238 |
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1239 // As in the case further above, since we are over-writing a NULL |
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1240 // pre-value, we can safely elide the pre-barrier here for the case of G1. |
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1241 // e.g.:- _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1242 assert(discovered == NULL, "control point invariant"); |
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1243 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1244 "For non-G1 collector, may need a pre-write-barrier for CAS from NULL below"); |
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1245 oop_store_raw(discovered_addr, next_discovered); |
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1246 if (_discovered_list_needs_barrier) { |
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1247 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1248 } |
0 | 1249 list->set_head(obj); |
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1250 list->inc_length(1); |
0 | 1251 |
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1252 if (TraceReferenceGC) { |
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1253 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1254 obj, obj->klass()->internal_name()); |
0 | 1255 } |
1256 } | |
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1257 assert(obj->is_oop(), "Discovered a bad reference"); |
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1258 verify_referent(obj); |
0 | 1259 return true; |
1260 } | |
1261 | |
1262 // Preclean the discovered references by removing those | |
1263 // whose referents are alive, and by marking from those that | |
1264 // are not active. These lists can be handled here | |
1265 // in any order and, indeed, concurrently. | |
1266 void ReferenceProcessor::preclean_discovered_references( | |
1267 BoolObjectClosure* is_alive, | |
1268 OopClosure* keep_alive, | |
1269 VoidClosure* complete_gc, | |
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1270 YieldClosure* yield) { |
0 | 1271 |
1272 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1273 | |
1274 // Soft references | |
1275 { | |
1276 TraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, | |
1277 false, gclog_or_tty); | |
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1278 for (uint i = 0; i < _max_num_q; i++) { |
452
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1279 if (yield->should_return()) { |
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1280 return; |
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1281 } |
0 | 1282 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1283 keep_alive, complete_gc, yield); | |
1284 } | |
1285 } | |
1286 | |
1287 // Weak references | |
1288 { | |
1289 TraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, | |
1290 false, gclog_or_tty); | |
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1291 for (uint i = 0; i < _max_num_q; i++) { |
452
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1292 if (yield->should_return()) { |
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1293 return; |
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1294 } |
0 | 1295 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1296 keep_alive, complete_gc, yield); | |
1297 } | |
1298 } | |
1299 | |
1300 // Final references | |
1301 { | |
1302 TraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, | |
1303 false, gclog_or_tty); | |
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1304 for (uint i = 0; i < _max_num_q; i++) { |
452
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1305 if (yield->should_return()) { |
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1306 return; |
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1307 } |
0 | 1308 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1309 keep_alive, complete_gc, yield); | |
1310 } | |
1311 } | |
1312 | |
1313 // Phantom references | |
1314 { | |
1315 TraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, | |
1316 false, gclog_or_tty); | |
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1317 for (uint i = 0; i < _max_num_q; i++) { |
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1318 if (yield->should_return()) { |
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1319 return; |
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1320 } |
0 | 1321 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1322 keep_alive, complete_gc, yield); | |
1323 } | |
1324 } | |
1325 } | |
1326 | |
1327 // Walk the given discovered ref list, and remove all reference objects | |
1328 // whose referents are still alive, whose referents are NULL or which | |
452
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1329 // are not active (have a non-NULL next field). NOTE: When we are |
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1330 // thus precleaning the ref lists (which happens single-threaded today), |
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1331 // we do not disable refs discovery to honour the correct semantics of |
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1332 // java.lang.Reference. As a result, we need to be careful below |
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1333 // that ref removal steps interleave safely with ref discovery steps |
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1334 // (in this thread). |
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1335 void |
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1336 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1337 BoolObjectClosure* is_alive, |
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1338 OopClosure* keep_alive, |
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1339 VoidClosure* complete_gc, |
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1340 YieldClosure* yield) { |
0 | 1341 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1342 while (iter.has_next()) { | |
1343 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1344 oop obj = iter.obj(); |
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1345 oop next = java_lang_ref_Reference::next(obj); |
0 | 1346 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1347 next != NULL) { |
0 | 1348 // The referent has been cleared, or is alive, or the Reference is not |
1349 // active; we need to trace and mark its cohort. | |
1350 if (TraceReferenceGC) { | |
1351 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1352 iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1353 } |
1354 // Remove Reference object from list | |
1355 iter.remove(); | |
1356 // Keep alive its cohort. | |
1357 iter.make_referent_alive(); | |
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1358 if (UseCompressedOops) { |
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1359 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1360 keep_alive->do_oop(next_addr); |
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1361 } else { |
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1362 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1363 keep_alive->do_oop(next_addr); |
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1364 } |
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1365 iter.move_to_next(); |
0 | 1366 } else { |
1367 iter.next(); | |
1368 } | |
1369 } | |
1370 // Close the reachable set | |
1371 complete_gc->do_void(); | |
1372 | |
1373 NOT_PRODUCT( | |
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1374 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1375 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1376 "Refs in discovered list " INTPTR_FORMAT, |
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1377 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1378 } |
1379 ) | |
1380 } | |
1381 | |
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1382 const char* ReferenceProcessor::list_name(uint i) { |
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1383 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1384 "Out of bounds index"); |
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1385 |
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1386 int j = i / _max_num_q; |
0 | 1387 switch (j) { |
1388 case 0: return "SoftRef"; | |
1389 case 1: return "WeakRef"; | |
1390 case 2: return "FinalRef"; | |
1391 case 3: return "PhantomRef"; | |
1392 } | |
1393 ShouldNotReachHere(); | |
1394 return NULL; | |
1395 } | |
1396 | |
1397 #ifndef PRODUCT | |
1398 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1399 // empty for now | |
1400 } | |
1401 #endif | |
1402 | |
1403 #ifndef PRODUCT | |
1404 void ReferenceProcessor::clear_discovered_references() { | |
1405 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1406 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1407 clear_discovered_references(_discovered_refs[i]); |
0 | 1408 } |
1409 } | |
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1410 |
0 | 1411 #endif // PRODUCT |