Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | 1d1603768966 |
children | 1f4413413144 |
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_SymbolTable_oops_do, | |
50 SH_PS_StringTable_oops_do, | |
51 SH_PS_CodeCache_oops_do, | |
52 // Leave this one last. | |
53 SH_PS_NumElements | |
54 }; | |
55 | |
56 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
57 CollectedHeap(), | |
58 _collector_policy(policy_), | |
59 _perm_gen(NULL), _rem_set(NULL), | |
60 _strong_roots_parity(0), | |
61 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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62 _n_par_threads(0), |
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63 _workers(NULL) |
0 | 64 { |
65 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
66 vm_exit_during_initialization("Failed necessary allocation."); | |
67 } | |
68 _sh = this; // ch is static, should be set only once. | |
69 if ((UseParNewGC || | |
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70 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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71 UseG1GC) && |
0 | 72 ParallelGCThreads > 0) { |
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73 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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74 /* are_GC_task_threads */true, |
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75 /* are_ConcurrentGC_threads */false); |
0 | 76 if (_workers == NULL) { |
77 vm_exit_during_initialization("Failed necessary allocation."); | |
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78 } else { |
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79 _workers->initialize_workers(); |
0 | 80 } |
81 } | |
82 } | |
83 | |
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84 bool SharedHeap::heap_lock_held_for_gc() { |
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85 Thread* t = Thread::current(); |
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86 return Heap_lock->owned_by_self() |
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87 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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88 && _thread_holds_heap_lock_for_gc); |
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89 } |
0 | 90 |
91 void SharedHeap::set_par_threads(int t) { | |
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92 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 93 _n_par_threads = t; |
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94 _process_strong_tasks->set_n_threads(t); |
0 | 95 } |
96 | |
97 class AssertIsPermClosure: public OopClosure { | |
98 public: | |
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99 virtual void do_oop(oop* p) { |
0 | 100 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
101 } | |
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102 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 103 }; |
104 static AssertIsPermClosure assert_is_perm_closure; | |
105 | |
106 void SharedHeap::change_strong_roots_parity() { | |
107 // Also set the new collection parity. | |
108 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
109 "Not in range."); | |
110 _strong_roots_parity++; | |
111 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
112 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
113 "Not in range."); | |
114 } | |
115 | |
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116 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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117 : MarkScope(activate) |
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118 { |
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119 if (_active) { |
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120 outer->change_strong_roots_parity(); |
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121 } |
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122 } |
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123 |
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124 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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125 // nothing particular |
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126 } |
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127 |
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128 void SharedHeap::process_strong_roots(bool activate_scope, |
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129 bool collecting_perm_gen, |
0 | 130 ScanningOption so, |
131 OopClosure* roots, | |
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132 CodeBlobClosure* code_roots, |
0 | 133 OopsInGenClosure* perm_blk) { |
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134 StrongRootsScope srs(this, activate_scope); |
0 | 135 // General strong roots. |
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136 assert(_strong_roots_parity != 0, "must have called prologue code"); |
0 | 137 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
138 Universe::oops_do(roots); | |
139 ReferenceProcessor::oops_do(roots); | |
140 // Consider perm-gen discovered lists to be strong. | |
141 perm_gen()->ref_processor()->weak_oops_do(roots); | |
142 } | |
143 // Global (strong) JNI handles | |
144 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
145 JNIHandles::oops_do(roots); | |
146 // All threads execute this; the individual threads are task groups. | |
147 if (ParallelGCThreads > 0) { | |
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148 Threads::possibly_parallel_oops_do(roots, code_roots); |
0 | 149 } else { |
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150 Threads::oops_do(roots, code_roots); |
0 | 151 } |
152 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
153 ObjectSynchronizer::oops_do(roots); | |
154 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
155 FlatProfiler::oops_do(roots); | |
156 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
157 Management::oops_do(roots); | |
158 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
159 JvmtiExport::oops_do(roots); | |
160 | |
161 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
162 if (so & SO_AllClasses) { | |
163 SystemDictionary::oops_do(roots); | |
164 } else | |
165 if (so & SO_SystemClasses) { | |
166 SystemDictionary::always_strong_oops_do(roots); | |
167 } | |
168 } | |
169 | |
170 if (!_process_strong_tasks->is_task_claimed(SH_PS_SymbolTable_oops_do)) { | |
171 } | |
172 | |
173 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
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174 if (so & SO_Strings || (!collecting_perm_gen && !JavaObjectsInPerm)) { |
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175 StringTable::oops_do(roots); |
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176 } |
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177 if (JavaObjectsInPerm) { |
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178 // Verify the string table contents are in the perm gen |
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179 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); |
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180 } |
0 | 181 } |
182 | |
183 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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184 if (so & SO_CodeCache) { |
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185 // (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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186 assert(collecting_perm_gen, "scanning all of code cache"); |
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187 assert(code_roots != NULL, "must supply closure for code cache"); |
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188 if (code_roots != NULL) { |
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189 CodeCache::blobs_do(code_roots); |
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190 } |
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191 } else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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192 if (!collecting_perm_gen) { |
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193 // If we are collecting from class statics, but we are not going to |
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194 // visit all of the CodeCache, collect from the non-perm roots if any. |
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195 // This makes the code cache function temporarily as a source of strong |
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196 // roots for oops, until the next major collection. |
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197 // |
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198 // If collecting_perm_gen is true, we require that this phase will call |
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199 // CodeCache::do_unloading. This will kill off nmethods with expired |
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200 // weak references, such as stale invokedynamic targets. |
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201 CodeCache::scavenge_root_nmethods_do(code_roots); |
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202 } |
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203 } |
0 | 204 // Verify if the code cache contents are in the perm gen |
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205 NOT_PRODUCT(CodeBlobToOopClosure assert_code_is_perm(&assert_is_perm_closure, /*do_marking=*/ false)); |
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206 NOT_PRODUCT(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_perm)); |
0 | 207 } |
208 | |
209 if (!collecting_perm_gen) { | |
210 // All threads perform this; coordination is handled internally. | |
211 | |
212 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
213 } | |
214 _process_strong_tasks->all_tasks_completed(); | |
215 } | |
216 | |
217 class AlwaysTrueClosure: public BoolObjectClosure { | |
218 public: | |
219 void do_object(oop p) { ShouldNotReachHere(); } | |
220 bool do_object_b(oop p) { return true; } | |
221 }; | |
222 static AlwaysTrueClosure always_true; | |
223 | |
224 class SkipAdjustingSharedStrings: public OopClosure { | |
225 OopClosure* _clo; | |
226 public: | |
227 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
228 | |
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229 virtual void do_oop(oop* p) { |
0 | 230 oop o = (*p); |
231 if (!o->is_shared_readwrite()) { | |
232 _clo->do_oop(p); | |
233 } | |
234 } | |
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235 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 236 }; |
237 | |
238 // Unmarked shared Strings in the StringTable (which got there due to | |
239 // being in the constant pools of as-yet unloaded shared classes) were | |
240 // not marked and therefore did not have their mark words preserved. | |
241 // These entries are also deliberately not purged from the string | |
242 // table during unloading of unmarked strings. If an identity hash | |
243 // code was computed for any of these objects, it will not have been | |
244 // cleared to zero during the forwarding process or by the | |
245 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
246 // adjusting process as a forwarding pointer. We need to skip | |
247 // forwarding StringTable entries which contain unmarked shared | |
248 // Strings. Actually, since shared strings won't be moving, we can | |
249 // just skip adjusting any shared entries in the string table. | |
250 | |
251 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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252 CodeBlobClosure* code_roots, |
0 | 253 OopClosure* non_root_closure) { |
254 // Global (weak) JNI handles | |
255 JNIHandles::weak_oops_do(&always_true, root_closure); | |
256 | |
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257 CodeCache::blobs_do(code_roots); |
0 | 258 if (UseSharedSpaces && !DumpSharedSpaces) { |
259 SkipAdjustingSharedStrings skip_closure(root_closure); | |
260 StringTable::oops_do(&skip_closure); | |
261 } else { | |
262 StringTable::oops_do(root_closure); | |
263 } | |
264 } | |
265 | |
266 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
267 _barrier_set = bs; | |
268 // Cached barrier set for fast access in oops | |
269 oopDesc::set_bs(bs); | |
270 } | |
271 | |
272 void SharedHeap::post_initialize() { | |
273 ref_processing_init(); | |
274 } | |
275 | |
276 void SharedHeap::ref_processing_init() { | |
277 perm_gen()->ref_processor_init(); | |
278 } | |
279 | |
280 // Some utilities. | |
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281 void SharedHeap::print_size_transition(outputStream* out, |
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282 size_t bytes_before, |
0 | 283 size_t bytes_after, |
284 size_t capacity) { | |
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6711316: Open source the Garbage-First garbage collector
ysr
parents:
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diff
changeset
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285 out->print(" %d%s->%d%s(%d%s)", |
0 | 286 byte_size_in_proper_unit(bytes_before), |
287 proper_unit_for_byte_size(bytes_before), | |
288 byte_size_in_proper_unit(bytes_after), | |
289 proper_unit_for_byte_size(bytes_after), | |
290 byte_size_in_proper_unit(capacity), | |
291 proper_unit_for_byte_size(capacity)); | |
292 } |