Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 8b10f48633dc |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 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 } |