Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
parents | 2aa9ddbb9e60 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "memory/sharedHeap.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/fprofiler.hpp" | |
33 #include "runtime/java.hpp" | |
34 #include "services/management.hpp" | |
35 #include "utilities/copy.hpp" | |
36 #include "utilities/workgroup.hpp" | |
0 | 37 |
38 SharedHeap* SharedHeap::_sh; | |
39 | |
40 // The set of potentially parallel tasks in strong root scanning. | |
41 enum SH_process_strong_roots_tasks { | |
42 SH_PS_Universe_oops_do, | |
43 SH_PS_JNIHandles_oops_do, | |
44 SH_PS_ObjectSynchronizer_oops_do, | |
45 SH_PS_FlatProfiler_oops_do, | |
46 SH_PS_Management_oops_do, | |
47 SH_PS_SystemDictionary_oops_do, | |
48 SH_PS_jvmti_oops_do, | |
49 SH_PS_StringTable_oops_do, | |
50 SH_PS_CodeCache_oops_do, | |
51 // Leave this one last. | |
52 SH_PS_NumElements | |
53 }; | |
54 | |
55 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
56 CollectedHeap(), | |
57 _collector_policy(policy_), | |
58 _perm_gen(NULL), _rem_set(NULL), | |
59 _strong_roots_parity(0), | |
60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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61 _n_par_threads(0), |
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62 _workers(NULL) |
0 | 63 { |
64 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
65 vm_exit_during_initialization("Failed necessary allocation."); | |
66 } | |
67 _sh = this; // ch is static, should be set only once. | |
68 if ((UseParNewGC || | |
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69 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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70 UseG1GC) && |
0 | 71 ParallelGCThreads > 0) { |
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72 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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73 /* are_GC_task_threads */true, |
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74 /* are_ConcurrentGC_threads */false); |
0 | 75 if (_workers == NULL) { |
76 vm_exit_during_initialization("Failed necessary allocation."); | |
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77 } else { |
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78 _workers->initialize_workers(); |
0 | 79 } |
80 } | |
81 } | |
82 | |
342
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83 bool SharedHeap::heap_lock_held_for_gc() { |
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84 Thread* t = Thread::current(); |
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85 return Heap_lock->owned_by_self() |
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86 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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87 && _thread_holds_heap_lock_for_gc); |
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88 } |
0 | 89 |
90 void SharedHeap::set_par_threads(int t) { | |
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91 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 92 _n_par_threads = t; |
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93 _process_strong_tasks->set_n_threads(t); |
0 | 94 } |
95 | |
96 class AssertIsPermClosure: public OopClosure { | |
97 public: | |
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98 virtual void do_oop(oop* p) { |
0 | 99 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
100 } | |
113
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101 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 102 }; |
103 static AssertIsPermClosure assert_is_perm_closure; | |
104 | |
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105 #ifdef ASSERT |
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106 class AssertNonScavengableClosure: public OopClosure { |
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107 public: |
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108 virtual void do_oop(oop* p) { |
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109 assert(!Universe::heap()->is_in_partial_collection(*p), |
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110 "Referent should not be scavengable."); } |
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111 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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112 }; |
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113 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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114 #endif |
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115 |
0 | 116 void SharedHeap::change_strong_roots_parity() { |
117 // Also set the new collection parity. | |
118 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
119 "Not in range."); | |
120 _strong_roots_parity++; | |
121 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
122 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
123 "Not in range."); | |
124 } | |
125 | |
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126 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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127 : MarkScope(activate) |
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128 { |
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129 if (_active) { |
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130 outer->change_strong_roots_parity(); |
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131 } |
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132 } |
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133 |
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134 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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135 // nothing particular |
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136 } |
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137 |
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138 void SharedHeap::process_strong_roots(bool activate_scope, |
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139 bool collecting_perm_gen, |
0 | 140 ScanningOption so, |
141 OopClosure* roots, | |
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142 CodeBlobClosure* code_roots, |
0 | 143 OopsInGenClosure* perm_blk) { |
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144 StrongRootsScope srs(this, activate_scope); |
0 | 145 // General strong roots. |
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146 assert(_strong_roots_parity != 0, "must have called prologue code"); |
0 | 147 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
148 Universe::oops_do(roots); | |
149 ReferenceProcessor::oops_do(roots); | |
150 // Consider perm-gen discovered lists to be strong. | |
151 perm_gen()->ref_processor()->weak_oops_do(roots); | |
152 } | |
153 // Global (strong) JNI handles | |
154 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
155 JNIHandles::oops_do(roots); | |
156 // All threads execute this; the individual threads are task groups. | |
157 if (ParallelGCThreads > 0) { | |
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158 Threads::possibly_parallel_oops_do(roots, code_roots); |
0 | 159 } else { |
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160 Threads::oops_do(roots, code_roots); |
0 | 161 } |
162 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
163 ObjectSynchronizer::oops_do(roots); | |
164 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
165 FlatProfiler::oops_do(roots); | |
166 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
167 Management::oops_do(roots); | |
168 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
169 JvmtiExport::oops_do(roots); | |
170 | |
171 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
172 if (so & SO_AllClasses) { | |
173 SystemDictionary::oops_do(roots); | |
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174 } else if (so & SO_SystemClasses) { |
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175 SystemDictionary::always_strong_oops_do(roots); |
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176 } |
0 | 177 } |
178 | |
179 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
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180 if (so & SO_Strings || (!collecting_perm_gen && !JavaObjectsInPerm)) { |
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181 StringTable::oops_do(roots); |
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182 } |
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183 if (JavaObjectsInPerm) { |
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184 // Verify the string table contents are in the perm gen |
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185 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); |
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186 } |
0 | 187 } |
188 | |
189 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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190 if (so & SO_CodeCache) { |
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191 // (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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192 assert(collecting_perm_gen, "scanning all of code cache"); |
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193 assert(code_roots != NULL, "must supply closure for code cache"); |
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194 if (code_roots != NULL) { |
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195 CodeCache::blobs_do(code_roots); |
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196 } |
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197 } else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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198 if (!collecting_perm_gen) { |
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199 // If we are collecting from class statics, but we are not going to |
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200 // visit all of the CodeCache, collect from the non-perm roots if any. |
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201 // This makes the code cache function temporarily as a source of strong |
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202 // roots for oops, until the next major collection. |
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203 // |
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204 // If collecting_perm_gen is true, we require that this phase will call |
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205 // CodeCache::do_unloading. This will kill off nmethods with expired |
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206 // weak references, such as stale invokedynamic targets. |
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207 CodeCache::scavenge_root_nmethods_do(code_roots); |
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208 } |
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209 } |
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210 // Verify that the code cache contents are not subject to |
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211 // movement by a scavenging collection. |
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212 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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213 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
0 | 214 } |
215 | |
216 if (!collecting_perm_gen) { | |
217 // All threads perform this; coordination is handled internally. | |
218 | |
219 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
220 } | |
221 _process_strong_tasks->all_tasks_completed(); | |
222 } | |
223 | |
224 class AlwaysTrueClosure: public BoolObjectClosure { | |
225 public: | |
226 void do_object(oop p) { ShouldNotReachHere(); } | |
227 bool do_object_b(oop p) { return true; } | |
228 }; | |
229 static AlwaysTrueClosure always_true; | |
230 | |
231 class SkipAdjustingSharedStrings: public OopClosure { | |
232 OopClosure* _clo; | |
233 public: | |
234 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
235 | |
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236 virtual void do_oop(oop* p) { |
0 | 237 oop o = (*p); |
238 if (!o->is_shared_readwrite()) { | |
239 _clo->do_oop(p); | |
240 } | |
241 } | |
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242 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 243 }; |
244 | |
245 // Unmarked shared Strings in the StringTable (which got there due to | |
246 // being in the constant pools of as-yet unloaded shared classes) were | |
247 // not marked and therefore did not have their mark words preserved. | |
248 // These entries are also deliberately not purged from the string | |
249 // table during unloading of unmarked strings. If an identity hash | |
250 // code was computed for any of these objects, it will not have been | |
251 // cleared to zero during the forwarding process or by the | |
252 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
253 // adjusting process as a forwarding pointer. We need to skip | |
254 // forwarding StringTable entries which contain unmarked shared | |
255 // Strings. Actually, since shared strings won't be moving, we can | |
256 // just skip adjusting any shared entries in the string table. | |
257 | |
258 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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259 CodeBlobClosure* code_roots, |
0 | 260 OopClosure* non_root_closure) { |
261 // Global (weak) JNI handles | |
262 JNIHandles::weak_oops_do(&always_true, root_closure); | |
263 | |
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264 CodeCache::blobs_do(code_roots); |
0 | 265 if (UseSharedSpaces && !DumpSharedSpaces) { |
266 SkipAdjustingSharedStrings skip_closure(root_closure); | |
267 StringTable::oops_do(&skip_closure); | |
268 } else { | |
269 StringTable::oops_do(root_closure); | |
270 } | |
271 } | |
272 | |
273 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
274 _barrier_set = bs; | |
275 // Cached barrier set for fast access in oops | |
276 oopDesc::set_bs(bs); | |
277 } | |
278 | |
279 void SharedHeap::post_initialize() { | |
280 ref_processing_init(); | |
281 } | |
282 | |
283 void SharedHeap::ref_processing_init() { | |
284 perm_gen()->ref_processor_init(); | |
285 } | |
286 | |
287 // Some utilities. | |
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288 void SharedHeap::print_size_transition(outputStream* out, |
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289 size_t bytes_before, |
0 | 290 size_t bytes_after, |
291 size_t capacity) { | |
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292 out->print(" %d%s->%d%s(%d%s)", |
0 | 293 byte_size_in_proper_unit(bytes_before), |
294 proper_unit_for_byte_size(bytes_before), | |
295 byte_size_in_proper_unit(bytes_after), | |
296 proper_unit_for_byte_size(bytes_after), | |
297 byte_size_in_proper_unit(capacity), | |
298 proper_unit_for_byte_size(capacity)); | |
299 } |