Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 1988:684faacebf20
7003782: Update JVMTI version to 1.2 for jdk7
Summary: Update minor version to 1.2 for jdk7
Reviewed-by: phh, dcubed
author | kamg |
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date | Mon, 06 Dec 2010 20:21:15 -0500 |
parents | f95d63e2154a |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2010, 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_vmSymbols_oops_do, | |
50 SH_PS_SymbolTable_oops_do, | |
51 SH_PS_StringTable_oops_do, | |
52 SH_PS_CodeCache_oops_do, | |
53 // Leave this one last. | |
54 SH_PS_NumElements | |
55 }; | |
56 | |
57 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
58 CollectedHeap(), | |
59 _collector_policy(policy_), | |
60 _perm_gen(NULL), _rem_set(NULL), | |
61 _strong_roots_parity(0), | |
62 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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63 _n_par_threads(0), |
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64 _workers(NULL) |
0 | 65 { |
66 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
67 vm_exit_during_initialization("Failed necessary allocation."); | |
68 } | |
69 _sh = this; // ch is static, should be set only once. | |
70 if ((UseParNewGC || | |
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71 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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72 UseG1GC) && |
0 | 73 ParallelGCThreads > 0) { |
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74 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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75 /* are_GC_task_threads */true, |
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76 /* are_ConcurrentGC_threads */false); |
0 | 77 if (_workers == NULL) { |
78 vm_exit_during_initialization("Failed necessary allocation."); | |
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79 } else { |
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80 _workers->initialize_workers(); |
0 | 81 } |
82 } | |
83 } | |
84 | |
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85 bool SharedHeap::heap_lock_held_for_gc() { |
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86 Thread* t = Thread::current(); |
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87 return Heap_lock->owned_by_self() |
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88 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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89 && _thread_holds_heap_lock_for_gc); |
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90 } |
0 | 91 |
92 void SharedHeap::set_par_threads(int t) { | |
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93 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 94 _n_par_threads = t; |
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95 _process_strong_tasks->set_n_threads(t); |
0 | 96 } |
97 | |
98 class AssertIsPermClosure: public OopClosure { | |
99 public: | |
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100 virtual void do_oop(oop* p) { |
0 | 101 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
102 } | |
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103 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 104 }; |
105 static AssertIsPermClosure assert_is_perm_closure; | |
106 | |
107 void SharedHeap::change_strong_roots_parity() { | |
108 // Also set the new collection parity. | |
109 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
110 "Not in range."); | |
111 _strong_roots_parity++; | |
112 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
113 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
114 "Not in range."); | |
115 } | |
116 | |
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117 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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118 : MarkScope(activate) |
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119 { |
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120 if (_active) { |
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121 outer->change_strong_roots_parity(); |
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122 } |
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123 } |
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124 |
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125 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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126 // nothing particular |
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127 } |
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128 |
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129 void SharedHeap::process_strong_roots(bool activate_scope, |
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130 bool collecting_perm_gen, |
0 | 131 ScanningOption so, |
132 OopClosure* roots, | |
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133 CodeBlobClosure* code_roots, |
0 | 134 OopsInGenClosure* perm_blk) { |
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135 StrongRootsScope srs(this, activate_scope); |
0 | 136 // General strong roots. |
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137 assert(_strong_roots_parity != 0, "must have called prologue code"); |
0 | 138 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
139 Universe::oops_do(roots); | |
140 ReferenceProcessor::oops_do(roots); | |
141 // Consider perm-gen discovered lists to be strong. | |
142 perm_gen()->ref_processor()->weak_oops_do(roots); | |
143 } | |
144 // Global (strong) JNI handles | |
145 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
146 JNIHandles::oops_do(roots); | |
147 // All threads execute this; the individual threads are task groups. | |
148 if (ParallelGCThreads > 0) { | |
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149 Threads::possibly_parallel_oops_do(roots, code_roots); |
0 | 150 } else { |
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151 Threads::oops_do(roots, code_roots); |
0 | 152 } |
153 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) | |
154 ObjectSynchronizer::oops_do(roots); | |
155 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
156 FlatProfiler::oops_do(roots); | |
157 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
158 Management::oops_do(roots); | |
159 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
160 JvmtiExport::oops_do(roots); | |
161 | |
162 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
163 if (so & SO_AllClasses) { | |
164 SystemDictionary::oops_do(roots); | |
165 } else | |
166 if (so & SO_SystemClasses) { | |
167 SystemDictionary::always_strong_oops_do(roots); | |
168 } | |
169 } | |
170 | |
171 if (!_process_strong_tasks->is_task_claimed(SH_PS_SymbolTable_oops_do)) { | |
172 if (so & SO_Symbols) { | |
173 SymbolTable::oops_do(roots); | |
174 } | |
175 // Verify if the symbol table contents are in the perm gen | |
176 NOT_PRODUCT(SymbolTable::oops_do(&assert_is_perm_closure)); | |
177 } | |
178 | |
179 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { | |
180 if (so & SO_Strings) { | |
181 StringTable::oops_do(roots); | |
182 } | |
183 // Verify if the string table contents are in the perm gen | |
184 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); | |
185 } | |
186 | |
187 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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188 if (so & SO_CodeCache) { |
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189 // (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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190 assert(collecting_perm_gen, "scanning all of code cache"); |
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191 assert(code_roots != NULL, "must supply closure for code cache"); |
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192 if (code_roots != NULL) { |
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193 CodeCache::blobs_do(code_roots); |
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194 } |
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195 } else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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196 if (!collecting_perm_gen) { |
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197 // If we are collecting from class statics, but we are not going to |
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198 // visit all of the CodeCache, collect from the non-perm roots if any. |
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199 // This makes the code cache function temporarily as a source of strong |
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200 // roots for oops, until the next major collection. |
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201 // |
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202 // If collecting_perm_gen is true, we require that this phase will call |
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203 // CodeCache::do_unloading. This will kill off nmethods with expired |
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204 // weak references, such as stale invokedynamic targets. |
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205 CodeCache::scavenge_root_nmethods_do(code_roots); |
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206 } |
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207 } |
0 | 208 // Verify if the code cache contents are in the perm gen |
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209 NOT_PRODUCT(CodeBlobToOopClosure assert_code_is_perm(&assert_is_perm_closure, /*do_marking=*/ false)); |
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210 NOT_PRODUCT(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_perm)); |
0 | 211 } |
212 | |
213 // Roots that should point only into permanent generation. | |
214 { | |
215 OopClosure* blk = NULL; | |
216 if (collecting_perm_gen) { | |
217 blk = roots; | |
218 } else { | |
219 debug_only(blk = &assert_is_perm_closure); | |
220 } | |
221 if (blk != NULL) { | |
222 if (!_process_strong_tasks->is_task_claimed(SH_PS_vmSymbols_oops_do)) | |
223 vmSymbols::oops_do(blk); | |
224 } | |
225 } | |
226 | |
227 if (!collecting_perm_gen) { | |
228 // All threads perform this; coordination is handled internally. | |
229 | |
230 rem_set()->younger_refs_iterate(perm_gen(), perm_blk); | |
231 } | |
232 _process_strong_tasks->all_tasks_completed(); | |
233 } | |
234 | |
235 class AlwaysTrueClosure: public BoolObjectClosure { | |
236 public: | |
237 void do_object(oop p) { ShouldNotReachHere(); } | |
238 bool do_object_b(oop p) { return true; } | |
239 }; | |
240 static AlwaysTrueClosure always_true; | |
241 | |
242 class SkipAdjustingSharedStrings: public OopClosure { | |
243 OopClosure* _clo; | |
244 public: | |
245 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} | |
246 | |
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247 virtual void do_oop(oop* p) { |
0 | 248 oop o = (*p); |
249 if (!o->is_shared_readwrite()) { | |
250 _clo->do_oop(p); | |
251 } | |
252 } | |
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253 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 254 }; |
255 | |
256 // Unmarked shared Strings in the StringTable (which got there due to | |
257 // being in the constant pools of as-yet unloaded shared classes) were | |
258 // not marked and therefore did not have their mark words preserved. | |
259 // These entries are also deliberately not purged from the string | |
260 // table during unloading of unmarked strings. If an identity hash | |
261 // code was computed for any of these objects, it will not have been | |
262 // cleared to zero during the forwarding process or by the | |
263 // RecursiveAdjustSharedObjectClosure, and will be confused by the | |
264 // adjusting process as a forwarding pointer. We need to skip | |
265 // forwarding StringTable entries which contain unmarked shared | |
266 // Strings. Actually, since shared strings won't be moving, we can | |
267 // just skip adjusting any shared entries in the string table. | |
268 | |
269 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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270 CodeBlobClosure* code_roots, |
0 | 271 OopClosure* non_root_closure) { |
272 // Global (weak) JNI handles | |
273 JNIHandles::weak_oops_do(&always_true, root_closure); | |
274 | |
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275 CodeCache::blobs_do(code_roots); |
0 | 276 SymbolTable::oops_do(root_closure); |
277 if (UseSharedSpaces && !DumpSharedSpaces) { | |
278 SkipAdjustingSharedStrings skip_closure(root_closure); | |
279 StringTable::oops_do(&skip_closure); | |
280 } else { | |
281 StringTable::oops_do(root_closure); | |
282 } | |
283 } | |
284 | |
285 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
286 _barrier_set = bs; | |
287 // Cached barrier set for fast access in oops | |
288 oopDesc::set_bs(bs); | |
289 } | |
290 | |
291 void SharedHeap::post_initialize() { | |
292 ref_processing_init(); | |
293 } | |
294 | |
295 void SharedHeap::ref_processing_init() { | |
296 perm_gen()->ref_processor_init(); | |
297 } | |
298 | |
299 // Some utilities. | |
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300 void SharedHeap::print_size_transition(outputStream* out, |
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301 size_t bytes_before, |
0 | 302 size_t bytes_after, |
303 size_t capacity) { | |
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304 out->print(" %d%s->%d%s(%d%s)", |
0 | 305 byte_size_in_proper_unit(bytes_before), |
306 proper_unit_for_byte_size(bytes_before), | |
307 byte_size_in_proper_unit(bytes_after), | |
308 proper_unit_for_byte_size(bytes_after), | |
309 byte_size_in_proper_unit(capacity), | |
310 proper_unit_for_byte_size(capacity)); | |
311 } |