Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 4526:0e1f15ec0e94
fixed profiling of typechecks
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Tue, 07 Feb 2012 11:43:05 -0800 |
parents | bf2d2b8b1726 |
children | e7dead7e90af |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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 jlong now = os::javaTimeMillis(); |
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47 |
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48 // Initialize the soft ref timestamp clock. |
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49 _soft_ref_timestamp_clock = now; |
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50 // Also update the soft ref clock in j.l.r.SoftReference |
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51 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 52 |
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53 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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54 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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55 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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56 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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57 vm_exit_during_initialization("Could not allocate reference policy object"); |
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58 } |
0 | 59 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
60 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
61 "Unrecongnized RefDiscoveryPolicy"); | |
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62 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 63 } |
64 | |
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65 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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66 #ifdef ASSERT |
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67 // Verify that we're not currently discovering refs |
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68 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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69 |
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70 if (check_no_refs) { |
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71 // Verify that the discovered lists are empty |
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72 verify_no_references_recorded(); |
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73 } |
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74 #endif // ASSERT |
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75 |
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76 // Someone could have modified the value of the static |
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77 // field in the j.l.r.SoftReference class that holds the |
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78 // soft reference timestamp clock using reflection or |
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79 // Unsafe between GCs. Unconditionally update the static |
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80 // field in ReferenceProcessor here so that we use the new |
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81 // value during reference discovery. |
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82 |
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83 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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84 _discovering_refs = true; |
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85 } |
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86 |
0 | 87 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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88 bool mt_processing, |
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89 int mt_processing_degree, |
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90 bool mt_discovery, |
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91 int mt_discovery_degree, |
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92 bool atomic_discovery, |
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93 BoolObjectClosure* is_alive_non_header, |
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94 bool discovered_list_needs_barrier) : |
0 | 95 _discovering_refs(false), |
96 _enqueuing_is_done(false), | |
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97 _is_alive_non_header(is_alive_non_header), |
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98 _discovered_list_needs_barrier(discovered_list_needs_barrier), |
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99 _bs(NULL), |
0 | 100 _processing_is_mt(mt_processing), |
101 _next_id(0) | |
102 { | |
103 _span = span; | |
104 _discovery_is_atomic = atomic_discovery; | |
105 _discovery_is_mt = mt_discovery; | |
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106 _num_q = MAX2(1, mt_processing_degree); |
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107 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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108 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
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109 _max_num_q * number_of_subclasses_of_ref()); |
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110 if (_discovered_refs == NULL) { |
0 | 111 vm_exit_during_initialization("Could not allocated RefProc Array"); |
112 } | |
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113 _discoveredSoftRefs = &_discovered_refs[0]; |
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114 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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115 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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116 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
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117 |
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118 // Initialize all entries to NULL |
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119 for (int i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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120 _discovered_refs[i].set_head(NULL); |
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121 _discovered_refs[i].set_length(0); |
0 | 122 } |
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123 |
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124 // If we do barriers, cache a copy of the barrier set. |
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125 if (discovered_list_needs_barrier) { |
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126 _bs = Universe::heap()->barrier_set(); |
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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 (int 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 (int 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. | |
154 jlong now = os::javaTimeMillis(); | |
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155 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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156 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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157 |
0 | 158 NOT_PRODUCT( |
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159 if (now < _soft_ref_timestamp_clock) { |
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160 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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161 _soft_ref_timestamp_clock, now); |
0 | 162 } |
163 ) | |
164 // In product mode, protect ourselves from system time being adjusted | |
165 // externally and going backward; see note in the implementation of | |
166 // GenCollectedHeap::time_since_last_gc() for the right way to fix | |
167 // this uniformly throughout the VM; see bug-id 4741166. XXX | |
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168 if (now > _soft_ref_timestamp_clock) { |
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169 _soft_ref_timestamp_clock = now; |
0 | 170 java_lang_ref_SoftReference::set_clock(now); |
171 } | |
172 // Else leave clock stalled at its old value until time progresses | |
173 // past clock value. | |
174 } | |
175 | |
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176 void ReferenceProcessor::process_discovered_references( |
0 | 177 BoolObjectClosure* is_alive, |
178 OopClosure* keep_alive, | |
179 VoidClosure* complete_gc, | |
180 AbstractRefProcTaskExecutor* task_executor) { | |
181 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
182 | |
183 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
184 // Stop treating discovered references specially. | |
185 disable_discovery(); | |
186 | |
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187 // If discovery was concurrent, someone could have modified |
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188 // the value of the static field in the j.l.r.SoftReference |
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189 // class that holds the soft reference timestamp clock using |
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190 // reflection or Unsafe between when discovery was enabled and |
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191 // now. Unconditionally update the static field in ReferenceProcessor |
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192 // here so that we use the new value during processing of the |
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193 // discovered soft refs. |
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194 |
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195 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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196 |
0 | 197 bool trace_time = PrintGCDetails && PrintReferenceGC; |
198 // Soft references | |
199 { | |
200 TraceTime tt("SoftReference", trace_time, false, gclog_or_tty); | |
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201 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, |
0 | 202 is_alive, keep_alive, complete_gc, task_executor); |
203 } | |
204 | |
205 update_soft_ref_master_clock(); | |
206 | |
207 // Weak references | |
208 { | |
209 TraceTime tt("WeakReference", trace_time, false, gclog_or_tty); | |
210 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
211 is_alive, keep_alive, complete_gc, task_executor); | |
212 } | |
213 | |
214 // Final references | |
215 { | |
216 TraceTime tt("FinalReference", trace_time, false, gclog_or_tty); | |
217 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
218 is_alive, keep_alive, complete_gc, task_executor); | |
219 } | |
220 | |
221 // Phantom references | |
222 { | |
223 TraceTime tt("PhantomReference", trace_time, false, gclog_or_tty); | |
224 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
225 is_alive, keep_alive, complete_gc, task_executor); | |
226 } | |
227 | |
228 // Weak global JNI references. It would make more sense (semantically) to | |
229 // traverse these simultaneously with the regular weak references above, but | |
230 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
231 // thus use JNI weak references to circumvent the phantom references and | |
232 // resurrect a "post-mortem" object. | |
233 { | |
234 TraceTime tt("JNI Weak Reference", trace_time, false, gclog_or_tty); | |
235 if (task_executor != NULL) { | |
236 task_executor->set_single_threaded_mode(); | |
237 } | |
238 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
239 } | |
240 } | |
241 | |
242 #ifndef PRODUCT | |
243 // Calculate the number of jni handles. | |
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244 uint ReferenceProcessor::count_jni_refs() { |
0 | 245 class AlwaysAliveClosure: public BoolObjectClosure { |
246 public: | |
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247 virtual bool do_object_b(oop obj) { return true; } |
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248 virtual void do_object(oop obj) { assert(false, "Don't call"); } |
0 | 249 }; |
250 | |
251 class CountHandleClosure: public OopClosure { | |
252 private: | |
253 int _count; | |
254 public: | |
255 CountHandleClosure(): _count(0) {} | |
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256 void do_oop(oop* unused) { _count++; } |
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257 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 258 int count() { return _count; } |
259 }; | |
260 CountHandleClosure global_handle_count; | |
261 AlwaysAliveClosure always_alive; | |
262 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
263 return global_handle_count.count(); | |
264 } | |
265 #endif | |
266 | |
267 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
268 OopClosure* keep_alive, | |
269 VoidClosure* complete_gc) { | |
270 #ifndef PRODUCT | |
271 if (PrintGCDetails && PrintReferenceGC) { | |
272 unsigned int count = count_jni_refs(); | |
273 gclog_or_tty->print(", %u refs", count); | |
274 } | |
275 #endif | |
276 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
277 complete_gc->do_void(); | |
278 } | |
279 | |
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280 |
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281 template <class T> |
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282 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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283 AbstractRefProcTaskExecutor* task_executor) { |
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284 |
0 | 285 // Remember old value of pending references list |
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286 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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287 T old_pending_list_value = *pending_list_addr; |
0 | 288 |
289 // Enqueue references that are not made active again, and | |
290 // clear the decks for the next collection (cycle). | |
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291 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
0 | 292 // Do the oop-check on pending_list_addr missed in |
293 // enqueue_discovered_reflist. We should probably | |
294 // do a raw oop_check so that future such idempotent | |
295 // oop_stores relying on the oop-check side-effect | |
296 // may be elided automatically and safely without | |
297 // affecting correctness. | |
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298 oop_store(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 299 |
300 // Stop treating discovered references specially. | |
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301 ref->disable_discovery(); |
0 | 302 |
303 // Return true if new pending references were added | |
304 return old_pending_list_value != *pending_list_addr; | |
305 } | |
306 | |
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307 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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308 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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309 if (UseCompressedOops) { |
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310 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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311 } else { |
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312 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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313 } |
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314 } |
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315 |
0 | 316 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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317 HeapWord* pending_list_addr) { |
0 | 318 // Given a list of refs linked through the "discovered" field |
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319 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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320 // thus distinguishing them from active References, then |
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321 // prepend them to the pending list. |
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322 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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323 // the "next" field is used to chain the pending list, not the discovered |
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324 // field. |
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325 |
0 | 326 if (TraceReferenceGC && PrintGCDetails) { |
327 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
328 INTPTR_FORMAT, (address)refs_list.head()); | |
329 } | |
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330 |
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331 oop obj = NULL; |
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332 oop next_d = refs_list.head(); |
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333 if (pending_list_uses_discovered_field()) { // New behaviour |
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334 // Walk down the list, self-looping the next field |
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335 // so that the References are not considered active. |
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336 while (obj != next_d) { |
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337 obj = next_d; |
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338 assert(obj->is_instanceRef(), "should be reference object"); |
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339 next_d = java_lang_ref_Reference::discovered(obj); |
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340 if (TraceReferenceGC && PrintGCDetails) { |
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341 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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342 obj, next_d); |
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343 } |
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344 assert(java_lang_ref_Reference::next(obj) == NULL, |
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345 "Reference not active; should not be discovered"); |
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346 // Self-loop next, so as to make Ref not active. |
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347 java_lang_ref_Reference::set_next(obj, obj); |
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348 if (next_d == obj) { // obj is last |
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349 // Swap refs_list into pendling_list_addr and |
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350 // set obj's discovered to what we read from pending_list_addr. |
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351 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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352 // Need oop_check on pending_list_addr above; |
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353 // see special oop-check code at the end of |
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354 // enqueue_discovered_reflists() further below. |
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355 java_lang_ref_Reference::set_discovered(obj, old); // old may be NULL |
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356 } |
0 | 357 } |
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358 } else { // Old behaviour |
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359 // Walk down the list, copying the discovered field into |
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360 // the next field and clearing the discovered field. |
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361 while (obj != next_d) { |
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362 obj = next_d; |
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363 assert(obj->is_instanceRef(), "should be reference object"); |
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364 next_d = java_lang_ref_Reference::discovered(obj); |
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365 if (TraceReferenceGC && PrintGCDetails) { |
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366 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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367 obj, next_d); |
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368 } |
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369 assert(java_lang_ref_Reference::next(obj) == NULL, |
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370 "The reference should not be enqueued"); |
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371 if (next_d == obj) { // obj is last |
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372 // Swap refs_list into pendling_list_addr and |
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373 // set obj's next to what we read from pending_list_addr. |
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374 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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375 // Need oop_check on pending_list_addr above; |
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376 // see special oop-check code at the end of |
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377 // enqueue_discovered_reflists() further below. |
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378 if (old == NULL) { |
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379 // obj should be made to point to itself, since |
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380 // pending list was empty. |
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381 java_lang_ref_Reference::set_next(obj, obj); |
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382 } else { |
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383 java_lang_ref_Reference::set_next(obj, old); |
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384 } |
0 | 385 } else { |
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386 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 387 } |
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388 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 389 } |
390 } | |
391 } | |
392 | |
393 // Parallel enqueue task | |
394 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
395 public: | |
396 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
397 DiscoveredList discovered_refs[], | |
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398 HeapWord* pending_list_addr, |
0 | 399 int n_queues) |
400 : EnqueueTask(ref_processor, discovered_refs, | |
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401 pending_list_addr, n_queues) |
0 | 402 { } |
403 | |
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404 virtual void work(unsigned int work_id) { |
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405 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 406 // Simplest first cut: static partitioning. |
407 int index = work_id; | |
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408 // The increment on "index" must correspond to the maximum number of queues |
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409 // (n_queues) with which that ReferenceProcessor was created. That |
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410 // is because of the "clever" way the discovered references lists were |
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411 // allocated and are indexed into. |
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412 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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413 for (int j = 0; |
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414 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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415 j++, index += _n_queues) { |
0 | 416 _ref_processor.enqueue_discovered_reflist( |
417 _refs_lists[index], _pending_list_addr); | |
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418 _refs_lists[index].set_head(NULL); |
0 | 419 _refs_lists[index].set_length(0); |
420 } | |
421 } | |
422 }; | |
423 | |
424 // Enqueue references that are not made active again | |
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425 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 426 AbstractRefProcTaskExecutor* task_executor) { |
427 if (_processing_is_mt && task_executor != NULL) { | |
428 // Parallel code | |
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429 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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430 pending_list_addr, _max_num_q); |
0 | 431 task_executor->execute(tsk); |
432 } else { | |
433 // Serial code: call the parent class's implementation | |
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434 for (int i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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435 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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436 _discovered_refs[i].set_head(NULL); |
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437 _discovered_refs[i].set_length(0); |
0 | 438 } |
439 } | |
440 } | |
441 | |
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442 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 443 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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444 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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445 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 446 "discovered field is bad"); |
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447 _next = discovered; |
0 | 448 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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449 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 450 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
451 "Wrong oop found in java.lang.Reference object"); | |
452 assert(allow_null_referent ? | |
453 _referent->is_oop_or_null() | |
454 : _referent->is_oop(), | |
455 "bad referent"); | |
456 } | |
457 | |
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458 void DiscoveredListIterator::remove() { |
0 | 459 assert(_ref->is_oop(), "Dropping a bad reference"); |
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460 oop_store_raw(_discovered_addr, NULL); |
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461 |
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462 // First _prev_next ref actually points into DiscoveredList (gross). |
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463 oop new_next; |
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464 if (_next == _ref) { |
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465 // At the end of the list, we should make _prev point to itself. |
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466 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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467 // and _prev will be NULL. |
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468 new_next = _prev; |
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469 } else { |
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470 new_next = _next; |
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471 } |
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472 |
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473 if (UseCompressedOops) { |
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474 // Remove Reference object from list. |
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475 oopDesc::encode_store_heap_oop((narrowOop*)_prev_next, new_next); |
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476 } else { |
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477 // Remove Reference object from list. |
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478 oopDesc::store_heap_oop((oop*)_prev_next, new_next); |
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479 } |
0 | 480 NOT_PRODUCT(_removed++); |
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481 _refs_list.dec_length(1); |
0 | 482 } |
483 | |
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484 // Make the Reference object active again. |
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485 void DiscoveredListIterator::make_active() { |
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486 // For G1 we don't want to use set_next - it |
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487 // will dirty the card for the next field of |
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488 // the reference object and will fail |
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489 // CT verification. |
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490 if (UseG1GC) { |
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491 BarrierSet* bs = oopDesc::bs(); |
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492 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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493 |
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494 if (UseCompressedOops) { |
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495 bs->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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496 } else { |
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497 bs->write_ref_field_pre((oop*)next_addr, NULL); |
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498 } |
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499 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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500 } else { |
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501 java_lang_ref_Reference::set_next(_ref, NULL); |
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502 } |
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503 } |
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504 |
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505 void DiscoveredListIterator::clear_referent() { |
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506 oop_store_raw(_referent_addr, NULL); |
0 | 507 } |
508 | |
509 // NOTE: process_phase*() are largely similar, and at a high level | |
510 // merely iterate over the extant list applying a predicate to | |
511 // each of its elements and possibly removing that element from the | |
512 // list and applying some further closures to that element. | |
513 // We should consider the possibility of replacing these | |
514 // process_phase*() methods by abstracting them into | |
515 // a single general iterator invocation that receives appropriate | |
516 // closures that accomplish this work. | |
517 | |
518 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
519 // referents are not alive, but that should be kept alive for policy reasons. | |
520 // Keep alive the transitive closure of all such referents. | |
521 void | |
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522 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 523 ReferencePolicy* policy, |
524 BoolObjectClosure* is_alive, | |
525 OopClosure* keep_alive, | |
526 VoidClosure* complete_gc) { | |
527 assert(policy != NULL, "Must have a non-NULL policy"); | |
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528 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 529 // Decide which softly reachable refs should be kept alive. |
530 while (iter.has_next()) { | |
531 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
532 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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533 if (referent_is_dead && |
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534 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 535 if (TraceReferenceGC) { |
536 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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537 iter.obj(), iter.obj()->blueprint()->internal_name()); |
0 | 538 } |
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539 // Remove Reference object from list |
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540 iter.remove(); |
0 | 541 // Make the Reference object active again |
542 iter.make_active(); | |
543 // keep the referent around | |
544 iter.make_referent_alive(); | |
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545 iter.move_to_next(); |
0 | 546 } else { |
547 iter.next(); | |
548 } | |
549 } | |
550 // Close the reachable set | |
551 complete_gc->do_void(); | |
552 NOT_PRODUCT( | |
553 if (PrintGCDetails && TraceReferenceGC) { | |
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554 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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555 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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556 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 557 } |
558 ) | |
559 } | |
560 | |
561 // Traverse the list and remove any Refs that are not active, or | |
562 // whose referents are either alive or NULL. | |
563 void | |
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564 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 565 BoolObjectClosure* is_alive, |
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566 OopClosure* keep_alive) { |
0 | 567 assert(discovery_is_atomic(), "Error"); |
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568 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 569 while (iter.has_next()) { |
570 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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571 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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572 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 573 if (iter.is_referent_alive()) { |
574 if (TraceReferenceGC) { | |
575 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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576 iter.obj(), iter.obj()->blueprint()->internal_name()); |
0 | 577 } |
578 // The referent is reachable after all. | |
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579 // Remove Reference object from list. |
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580 iter.remove(); |
0 | 581 // Update the referent pointer as necessary: Note that this |
582 // should not entail any recursive marking because the | |
583 // referent must already have been traversed. | |
584 iter.make_referent_alive(); | |
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585 iter.move_to_next(); |
0 | 586 } else { |
587 iter.next(); | |
588 } | |
589 } | |
590 NOT_PRODUCT( | |
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591 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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592 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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593 "Refs in discovered list " INTPTR_FORMAT, |
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594 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 595 } |
596 ) | |
597 } | |
598 | |
599 void | |
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600 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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601 BoolObjectClosure* is_alive, |
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602 OopClosure* keep_alive, |
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603 VoidClosure* complete_gc) { |
0 | 604 assert(!discovery_is_atomic(), "Error"); |
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605 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 606 while (iter.has_next()) { |
607 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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608 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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609 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 610 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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611 next != NULL)) { |
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612 assert(next->is_oop_or_null(), "bad next field"); |
0 | 613 // Remove Reference object from list |
614 iter.remove(); | |
615 // Trace the cohorts | |
616 iter.make_referent_alive(); | |
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617 if (UseCompressedOops) { |
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618 keep_alive->do_oop((narrowOop*)next_addr); |
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619 } else { |
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620 keep_alive->do_oop((oop*)next_addr); |
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621 } |
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622 iter.move_to_next(); |
0 | 623 } else { |
624 iter.next(); | |
625 } | |
626 } | |
627 // Now close the newly reachable set | |
628 complete_gc->do_void(); | |
629 NOT_PRODUCT( | |
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630 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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631 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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632 "Refs in discovered list " INTPTR_FORMAT, |
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633 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 634 } |
635 ) | |
636 } | |
637 | |
638 // Traverse the list and process the referents, by either | |
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639 // clearing them or keeping them (and their reachable |
0 | 640 // closure) alive. |
641 void | |
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642 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 643 bool clear_referent, |
644 BoolObjectClosure* is_alive, | |
645 OopClosure* keep_alive, | |
646 VoidClosure* complete_gc) { | |
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647 ResourceMark rm; |
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648 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 649 while (iter.has_next()) { |
650 iter.update_discovered(); | |
651 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
652 if (clear_referent) { | |
653 // NULL out referent pointer | |
654 iter.clear_referent(); | |
655 } else { | |
656 // keep the referent around | |
657 iter.make_referent_alive(); | |
658 } | |
659 if (TraceReferenceGC) { | |
660 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
661 clear_referent ? "cleared " : "", | |
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662 iter.obj(), iter.obj()->blueprint()->internal_name()); |
0 | 663 } |
664 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
665 iter.next(); | |
666 } | |
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667 // Remember to update the next pointer of the last ref. |
0 | 668 iter.update_discovered(); |
669 // Close the reachable set | |
670 complete_gc->do_void(); | |
671 } | |
672 | |
673 void | |
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674 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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675 oop obj = NULL; |
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676 oop next = refs_list.head(); |
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677 while (next != obj) { |
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678 obj = next; |
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679 next = java_lang_ref_Reference::discovered(obj); |
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680 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 681 } |
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682 refs_list.set_head(NULL); |
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683 refs_list.set_length(0); |
0 | 684 } |
685 | |
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686 void |
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687 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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688 clear_discovered_references(refs_list); |
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689 } |
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690 |
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691 void ReferenceProcessor::abandon_partial_discovery() { |
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692 // loop over the lists |
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693 for (int i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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694 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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695 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
342
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696 } |
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697 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 698 } |
699 } | |
700 | |
701 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
702 public: | |
703 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
704 DiscoveredList refs_lists[], | |
705 ReferencePolicy* policy, | |
706 bool marks_oops_alive) | |
707 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
708 _policy(policy) | |
709 { } | |
710 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
711 OopClosure& keep_alive, | |
712 VoidClosure& complete_gc) | |
713 { | |
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714 Thread* thr = Thread::current(); |
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715 int refs_list_index = ((WorkerThread*)thr)->id(); |
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716 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 717 &is_alive, &keep_alive, &complete_gc); |
718 } | |
719 private: | |
720 ReferencePolicy* _policy; | |
721 }; | |
722 | |
723 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
724 public: | |
725 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
726 DiscoveredList refs_lists[], | |
727 bool marks_oops_alive) | |
728 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
729 { } | |
730 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
731 OopClosure& keep_alive, | |
732 VoidClosure& complete_gc) | |
733 { | |
734 _ref_processor.process_phase2(_refs_lists[i], | |
735 &is_alive, &keep_alive, &complete_gc); | |
736 } | |
737 }; | |
738 | |
739 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
740 public: | |
741 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
742 DiscoveredList refs_lists[], | |
743 bool clear_referent, | |
744 bool marks_oops_alive) | |
745 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
746 _clear_referent(clear_referent) | |
747 { } | |
748 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
749 OopClosure& keep_alive, | |
750 VoidClosure& complete_gc) | |
751 { | |
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752 // Don't use "refs_list_index" calculated in this way because |
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753 // balance_queues() has moved the Ref's into the first n queues. |
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754 // Thread* thr = Thread::current(); |
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755 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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756 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 757 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
758 &is_alive, &keep_alive, &complete_gc); | |
759 } | |
760 private: | |
761 bool _clear_referent; | |
762 }; | |
763 | |
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764 void ReferenceProcessor::set_discovered(oop ref, oop value) { |
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765 if (_discovered_list_needs_barrier) { |
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766 java_lang_ref_Reference::set_discovered(ref, value); |
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767 } else { |
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768 java_lang_ref_Reference::set_discovered_raw(ref, value); |
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769 } |
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770 } |
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771 |
0 | 772 // Balances reference queues. |
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773 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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774 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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775 // corresponding to the active workers will be processed. |
0 | 776 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
777 { | |
778 // calculate total length | |
779 size_t total_refs = 0; | |
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780 if (TraceReferenceGC && PrintGCDetails) { |
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781 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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782 } |
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783 |
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784 for (int i = 0; i < _max_num_q; ++i) { |
0 | 785 total_refs += ref_lists[i].length(); |
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786 if (TraceReferenceGC && PrintGCDetails) { |
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787 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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788 } |
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789 } |
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790 if (TraceReferenceGC && PrintGCDetails) { |
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791 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 792 } |
793 size_t avg_refs = total_refs / _num_q + 1; | |
794 int to_idx = 0; | |
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795 for (int from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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796 bool move_all = false; |
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797 if (from_idx >= _num_q) { |
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798 move_all = ref_lists[from_idx].length() > 0; |
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799 } |
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800 while ((ref_lists[from_idx].length() > avg_refs) || |
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801 move_all) { |
0 | 802 assert(to_idx < _num_q, "Sanity Check!"); |
803 if (ref_lists[to_idx].length() < avg_refs) { | |
804 // move superfluous refs | |
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805 size_t refs_to_move; |
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806 // Move all the Ref's if the from queue will not be processed. |
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807 if (move_all) { |
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808 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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809 avg_refs - ref_lists[to_idx].length()); |
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810 } else { |
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811 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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812 avg_refs - ref_lists[to_idx].length()); |
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813 } |
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814 |
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815 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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816 |
0 | 817 oop move_head = ref_lists[from_idx].head(); |
818 oop move_tail = move_head; | |
819 oop new_head = move_head; | |
820 // find an element to split the list on | |
821 for (size_t j = 0; j < refs_to_move; ++j) { | |
822 move_tail = new_head; | |
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823 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 824 } |
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825 |
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826 // Add the chain to the to list. |
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827 if (ref_lists[to_idx].head() == NULL) { |
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828 // to list is empty. Make a loop at the end. |
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829 set_discovered(move_tail, move_tail); |
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830 } else { |
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831 set_discovered(move_tail, ref_lists[to_idx].head()); |
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832 } |
0 | 833 ref_lists[to_idx].set_head(move_head); |
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834 ref_lists[to_idx].inc_length(refs_to_move); |
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835 |
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836 // Remove the chain from the from list. |
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837 if (move_tail == new_head) { |
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838 // We found the end of the from list. |
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839 ref_lists[from_idx].set_head(NULL); |
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840 } else { |
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841 ref_lists[from_idx].set_head(new_head); |
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842 } |
452
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843 ref_lists[from_idx].dec_length(refs_to_move); |
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844 if (ref_lists[from_idx].length() == 0) { |
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845 break; |
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846 } |
0 | 847 } else { |
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848 to_idx = (to_idx + 1) % _num_q; |
0 | 849 } |
850 } | |
851 } | |
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852 #ifdef ASSERT |
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853 size_t balanced_total_refs = 0; |
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854 for (int i = 0; i < _max_num_q; ++i) { |
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855 balanced_total_refs += ref_lists[i].length(); |
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856 if (TraceReferenceGC && PrintGCDetails) { |
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857 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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858 } |
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859 } |
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860 if (TraceReferenceGC && PrintGCDetails) { |
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861 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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862 gclog_or_tty->flush(); |
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863 } |
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864 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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865 #endif |
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866 } |
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867 |
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868 void ReferenceProcessor::balance_all_queues() { |
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869 balance_queues(_discoveredSoftRefs); |
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870 balance_queues(_discoveredWeakRefs); |
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871 balance_queues(_discoveredFinalRefs); |
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872 balance_queues(_discoveredPhantomRefs); |
0 | 873 } |
874 | |
875 void | |
876 ReferenceProcessor::process_discovered_reflist( | |
877 DiscoveredList refs_lists[], | |
878 ReferencePolicy* policy, | |
879 bool clear_referent, | |
880 BoolObjectClosure* is_alive, | |
881 OopClosure* keep_alive, | |
882 VoidClosure* complete_gc, | |
883 AbstractRefProcTaskExecutor* task_executor) | |
884 { | |
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885 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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886 // If discovery used MT and a dynamic number of GC threads, then |
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887 // the queues must be balanced for correctness if fewer than the |
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888 // maximum number of queues were used. The number of queue used |
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889 // during discovery may be different than the number to be used |
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890 // for processing so don't depend of _num_q < _max_num_q as part |
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891 // of the test. |
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892 bool must_balance = _discovery_is_mt; |
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893 |
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894 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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895 must_balance) { |
0 | 896 balance_queues(refs_lists); |
897 } | |
898 if (PrintReferenceGC && PrintGCDetails) { | |
899 size_t total = 0; | |
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900 for (int i = 0; i < _max_num_q; ++i) { |
0 | 901 total += refs_lists[i].length(); |
902 } | |
903 gclog_or_tty->print(", %u refs", total); | |
904 } | |
905 | |
906 // Phase 1 (soft refs only): | |
907 // . Traverse the list and remove any SoftReferences whose | |
908 // referents are not alive, but that should be kept alive for | |
909 // policy reasons. Keep alive the transitive closure of all | |
910 // such referents. | |
911 if (policy != NULL) { | |
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912 if (mt_processing) { |
0 | 913 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
914 task_executor->execute(phase1); | |
915 } else { | |
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916 for (int i = 0; i < _max_num_q; i++) { |
0 | 917 process_phase1(refs_lists[i], policy, |
918 is_alive, keep_alive, complete_gc); | |
919 } | |
920 } | |
921 } else { // policy == NULL | |
922 assert(refs_lists != _discoveredSoftRefs, | |
923 "Policy must be specified for soft references."); | |
924 } | |
925 | |
926 // Phase 2: | |
927 // . Traverse the list and remove any refs whose referents are alive. | |
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928 if (mt_processing) { |
0 | 929 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
930 task_executor->execute(phase2); | |
931 } else { | |
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932 for (int i = 0; i < _max_num_q; i++) { |
0 | 933 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
934 } | |
935 } | |
936 | |
937 // Phase 3: | |
938 // . Traverse the list and process referents as appropriate. | |
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939 if (mt_processing) { |
0 | 940 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
941 task_executor->execute(phase3); | |
942 } else { | |
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943 for (int i = 0; i < _max_num_q; i++) { |
0 | 944 process_phase3(refs_lists[i], clear_referent, |
945 is_alive, keep_alive, complete_gc); | |
946 } | |
947 } | |
948 } | |
949 | |
950 void ReferenceProcessor::clean_up_discovered_references() { | |
951 // loop over the lists | |
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952 for (int i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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953 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 954 gclog_or_tty->print_cr( |
955 "\nScrubbing %s discovered list of Null referents", | |
956 list_name(i)); | |
957 } | |
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958 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 959 } |
960 } | |
961 | |
962 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
963 assert(!discovery_is_atomic(), "Else why call this method?"); | |
964 DiscoveredListIterator iter(refs_list, NULL, NULL); | |
965 while (iter.has_next()) { | |
966 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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967 oop next = java_lang_ref_Reference::next(iter.obj()); |
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968 assert(next->is_oop_or_null(), "bad next field"); |
0 | 969 // If referent has been cleared or Reference is not active, |
970 // drop it. | |
113
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971 if (iter.referent() == NULL || next != NULL) { |
0 | 972 debug_only( |
973 if (PrintGCDetails && TraceReferenceGC) { | |
974 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
975 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
976 " and referent: " INTPTR_FORMAT, | |
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977 iter.obj(), next, iter.referent()); |
0 | 978 } |
979 ) | |
980 // Remove Reference object from list | |
981 iter.remove(); | |
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982 iter.move_to_next(); |
0 | 983 } else { |
984 iter.next(); | |
985 } | |
986 } | |
987 NOT_PRODUCT( | |
988 if (PrintGCDetails && TraceReferenceGC) { | |
989 gclog_or_tty->print( | |
990 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
991 iter.removed(), iter.processed()); | |
992 } | |
993 ) | |
994 } | |
995 | |
996 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
997 int id = 0; | |
998 // Determine the queue index to use for this object. | |
999 if (_discovery_is_mt) { | |
1000 // During a multi-threaded discovery phase, | |
1001 // each thread saves to its "own" list. | |
1002 Thread* thr = Thread::current(); | |
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1003 id = thr->as_Worker_thread()->id(); |
0 | 1004 } else { |
1005 // single-threaded discovery, we save in round-robin | |
1006 // fashion to each of the lists. | |
1007 if (_processing_is_mt) { | |
1008 id = next_id(); | |
1009 } | |
1010 } | |
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1011 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1012 |
1013 // Get the discovered queue to which we will add | |
1014 DiscoveredList* list = NULL; | |
1015 switch (rt) { | |
1016 case REF_OTHER: | |
1017 // Unknown reference type, no special treatment | |
1018 break; | |
1019 case REF_SOFT: | |
1020 list = &_discoveredSoftRefs[id]; | |
1021 break; | |
1022 case REF_WEAK: | |
1023 list = &_discoveredWeakRefs[id]; | |
1024 break; | |
1025 case REF_FINAL: | |
1026 list = &_discoveredFinalRefs[id]; | |
1027 break; | |
1028 case REF_PHANTOM: | |
1029 list = &_discoveredPhantomRefs[id]; | |
1030 break; | |
1031 case REF_NONE: | |
1032 // we should not reach here if we are an instanceRefKlass | |
1033 default: | |
1034 ShouldNotReachHere(); | |
1035 } | |
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1036 if (TraceReferenceGC && PrintGCDetails) { |
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1037 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1038 } |
0 | 1039 return list; |
1040 } | |
1041 | |
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1042 inline void |
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1043 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1044 oop obj, |
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1045 HeapWord* discovered_addr) { |
0 | 1046 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1047 // First we must make sure this object is only enqueued once. CAS in a non null | |
1048 // discovered_addr. | |
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1049 oop current_head = refs_list.head(); |
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1050 // The last ref must have its discovered field pointing to itself. |
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1051 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1052 |
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1053 // Note: In the case of G1, this specific pre-barrier is strictly |
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1054 // not necessary because the only case we are interested in |
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1055 // here is when *discovered_addr is NULL (see the CAS further below), |
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1056 // so this will expand to nothing. As a result, we have manually |
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1057 // elided this out for G1, but left in the test for some future |
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1058 // collector that might have need for a pre-barrier here, e.g.:- |
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1059 // _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1060 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1061 "Need to check non-G1 collector: " |
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1062 "may need a pre-write-barrier for CAS from NULL below"); |
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1063 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1064 NULL); |
0 | 1065 if (retest == NULL) { |
1066 // This thread just won the right to enqueue the object. | |
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1067 // We have separate lists for enqueueing, so no synchronization |
0 | 1068 // is necessary. |
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1069 refs_list.set_head(obj); |
452
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1070 refs_list.inc_length(1); |
342
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1071 if (_discovered_list_needs_barrier) { |
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1072 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1073 } |
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1074 |
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1075 if (TraceReferenceGC) { |
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1076 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1077 obj, obj->blueprint()->internal_name()); |
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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)", |
0 | 1084 obj, obj->blueprint()->internal_name()); |
1085 } | |
1086 } | |
1087 } | |
1088 | |
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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 ", |
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1099 (intptr_t)referent, (intptr_t)obj, da ? "" : "non-")); |
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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. |
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1135 oop next = java_lang_ref_Reference::next(obj); |
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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) { |
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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 } | |
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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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1159 // current candidates for clearing, in which case we |
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1160 // can mark through them now, rather than delaying that |
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1161 // to the reference-processing phase. Since all current |
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1162 // time-stamp policies advance the soft-ref clock only |
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1163 // at a major collection cycle, this is always currently |
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1164 // accurate. |
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1165 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
453
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1166 return false; |
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1167 } |
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1168 } |
0 | 1169 |
3979
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1170 ResourceMark rm; // Needed for tracing. |
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1171 |
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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); |
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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) { | |
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1178 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1179 obj, obj->blueprint()->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. | |
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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) { | |
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1199 verify_referent(obj); |
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1200 // Discover if and only if EITHER: |
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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) || |
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1204 (discovery_is_atomic() && |
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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 { | |
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1224 // If "_discovered_list_needs_barrier", we do write barriers when |
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1225 // updating the discovered reference list. Otherwise, we do a raw store |
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1226 // here: the field will be visited later when processing the discovered |
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1227 // references. |
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1228 oop current_head = list->head(); |
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1229 // The last ref must have its discovered field pointing to itself. |
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1230 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1231 |
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1232 // As in the case further above, since we are over-writing a NULL |
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1233 // pre-value, we can safely elide the pre-barrier here for the case of G1. |
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1234 // e.g.:- _bs->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
342
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1235 assert(discovered == NULL, "control point invariant"); |
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1236 assert(!_discovered_list_needs_barrier || UseG1GC, |
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1237 "For non-G1 collector, may need a pre-write-barrier for CAS from NULL below"); |
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1238 oop_store_raw(discovered_addr, next_discovered); |
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1239 if (_discovered_list_needs_barrier) { |
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1240 _bs->write_ref_field((void*)discovered_addr, next_discovered); |
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1241 } |
0 | 1242 list->set_head(obj); |
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1243 list->inc_length(1); |
0 | 1244 |
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1245 if (TraceReferenceGC) { |
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1246 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1247 obj, obj->blueprint()->internal_name()); |
0 | 1248 } |
1249 } | |
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1250 assert(obj->is_oop(), "Discovered a bad reference"); |
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1251 verify_referent(obj); |
0 | 1252 return true; |
1253 } | |
1254 | |
1255 // Preclean the discovered references by removing those | |
1256 // whose referents are alive, and by marking from those that | |
1257 // are not active. These lists can be handled here | |
1258 // in any order and, indeed, concurrently. | |
1259 void ReferenceProcessor::preclean_discovered_references( | |
1260 BoolObjectClosure* is_alive, | |
1261 OopClosure* keep_alive, | |
1262 VoidClosure* complete_gc, | |
1190
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1263 YieldClosure* yield, |
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1264 bool should_unload_classes) { |
0 | 1265 |
1266 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1267 | |
935 | 1268 #ifdef ASSERT |
1269 bool must_remember_klasses = ClassUnloading && !UseConcMarkSweepGC || | |
1190
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1270 CMSClassUnloadingEnabled && UseConcMarkSweepGC || |
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1271 ExplicitGCInvokesConcurrentAndUnloadsClasses && |
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1272 UseConcMarkSweepGC && should_unload_classes; |
935 | 1273 RememberKlassesChecker mx(must_remember_klasses); |
1274 #endif | |
0 | 1275 // Soft references |
1276 { | |
1277 TraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, | |
1278 false, gclog_or_tty); | |
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1279 for (int i = 0; i < _max_num_q; i++) { |
452
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1280 if (yield->should_return()) { |
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1281 return; |
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1282 } |
0 | 1283 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1284 keep_alive, complete_gc, yield); | |
1285 } | |
1286 } | |
1287 | |
1288 // Weak references | |
1289 { | |
1290 TraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, | |
1291 false, gclog_or_tty); | |
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1292 for (int i = 0; i < _max_num_q; i++) { |
452
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1293 if (yield->should_return()) { |
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1294 return; |
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1295 } |
0 | 1296 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1297 keep_alive, complete_gc, yield); | |
1298 } | |
1299 } | |
1300 | |
1301 // Final references | |
1302 { | |
1303 TraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, | |
1304 false, gclog_or_tty); | |
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1305 for (int i = 0; i < _max_num_q; i++) { |
452
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1306 if (yield->should_return()) { |
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1307 return; |
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1308 } |
0 | 1309 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1310 keep_alive, complete_gc, yield); | |
1311 } | |
1312 } | |
1313 | |
1314 // Phantom references | |
1315 { | |
1316 TraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, | |
1317 false, gclog_or_tty); | |
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1318 for (int i = 0; i < _max_num_q; i++) { |
452
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1319 if (yield->should_return()) { |
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1320 return; |
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1321 } |
0 | 1322 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1323 keep_alive, complete_gc, yield); | |
1324 } | |
1325 } | |
1326 } | |
1327 | |
1328 // Walk the given discovered ref list, and remove all reference objects | |
1329 // whose referents are still alive, whose referents are NULL or which | |
452
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1330 // are not active (have a non-NULL next field). NOTE: When we are |
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1331 // thus precleaning the ref lists (which happens single-threaded today), |
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1332 // we do not disable refs discovery to honour the correct semantics of |
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1333 // java.lang.Reference. As a result, we need to be careful below |
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1334 // that ref removal steps interleave safely with ref discovery steps |
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1335 // (in this thread). |
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1336 void |
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1337 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1338 BoolObjectClosure* is_alive, |
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1339 OopClosure* keep_alive, |
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1340 VoidClosure* complete_gc, |
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1341 YieldClosure* yield) { |
0 | 1342 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1343 while (iter.has_next()) { | |
1344 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1345 oop obj = iter.obj(); |
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1346 oop next = java_lang_ref_Reference::next(obj); |
0 | 1347 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1348 next != NULL) { |
0 | 1349 // The referent has been cleared, or is alive, or the Reference is not |
1350 // active; we need to trace and mark its cohort. | |
1351 if (TraceReferenceGC) { | |
1352 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
1353 iter.obj(), iter.obj()->blueprint()->internal_name()); | |
1354 } | |
1355 // Remove Reference object from list | |
1356 iter.remove(); | |
1357 // Keep alive its cohort. | |
1358 iter.make_referent_alive(); | |
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1359 if (UseCompressedOops) { |
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1360 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1361 keep_alive->do_oop(next_addr); |
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1362 } else { |
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1363 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1364 keep_alive->do_oop(next_addr); |
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1365 } |
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1366 iter.move_to_next(); |
0 | 1367 } else { |
1368 iter.next(); | |
1369 } | |
1370 } | |
1371 // Close the reachable set | |
1372 complete_gc->do_void(); | |
1373 | |
1374 NOT_PRODUCT( | |
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1375 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1376 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1377 "Refs in discovered list " INTPTR_FORMAT, |
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1378 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1379 } |
1380 ) | |
1381 } | |
1382 | |
1383 const char* ReferenceProcessor::list_name(int i) { | |
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1384 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1385 "Out of bounds index"); |
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1386 |
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1387 int j = i / _max_num_q; |
0 | 1388 switch (j) { |
1389 case 0: return "SoftRef"; | |
1390 case 1: return "WeakRef"; | |
1391 case 2: return "FinalRef"; | |
1392 case 3: return "PhantomRef"; | |
1393 } | |
1394 ShouldNotReachHere(); | |
1395 return NULL; | |
1396 } | |
1397 | |
1398 #ifndef PRODUCT | |
1399 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1400 // empty for now | |
1401 } | |
1402 #endif | |
1403 | |
1404 #ifndef PRODUCT | |
1405 void ReferenceProcessor::clear_discovered_references() { | |
1406 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1407 for (int i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1408 clear_discovered_references(_discovered_refs[i]); |
0 | 1409 } |
1410 } | |
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1411 |
0 | 1412 #endif // PRODUCT |