Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 11954:905c26108117
removed warning
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 10 Oct 2013 12:05:39 +0200 |
parents | 01522ca68fc7 |
children | ca9dedeebdec |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, 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, | |
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48 SH_PS_ClassLoaderDataGraph_oops_do, |
0 | 49 SH_PS_jvmti_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_), | |
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58 _rem_set(NULL), |
0 | 59 _strong_roots_parity(0), |
60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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61 _workers(NULL) |
0 | 62 { |
63 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
64 vm_exit_during_initialization("Failed necessary allocation."); | |
65 } | |
66 _sh = this; // ch is static, should be set only once. | |
67 if ((UseParNewGC || | |
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68 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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69 UseG1GC) && |
0 | 70 ParallelGCThreads > 0) { |
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71 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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72 /* are_GC_task_threads */true, |
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73 /* are_ConcurrentGC_threads */false); |
0 | 74 if (_workers == NULL) { |
75 vm_exit_during_initialization("Failed necessary allocation."); | |
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76 } else { |
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77 _workers->initialize_workers(); |
0 | 78 } |
79 } | |
80 } | |
81 | |
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82 int SharedHeap::n_termination() { |
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83 return _process_strong_tasks->n_threads(); |
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84 } |
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85 |
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86 void SharedHeap::set_n_termination(int t) { |
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87 _process_strong_tasks->set_n_threads(t); |
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88 } |
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89 |
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90 bool SharedHeap::heap_lock_held_for_gc() { |
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91 Thread* t = Thread::current(); |
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92 return Heap_lock->owned_by_self() |
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93 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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94 && _thread_holds_heap_lock_for_gc); |
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95 } |
0 | 96 |
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97 void SharedHeap::set_par_threads(uint t) { |
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98 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 99 _n_par_threads = t; |
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100 _process_strong_tasks->set_n_threads(t); |
0 | 101 } |
102 | |
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103 #ifdef ASSERT |
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104 class AssertNonScavengableClosure: public OopClosure { |
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105 public: |
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106 virtual void do_oop(oop* p) { |
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107 assert(!Universe::heap()->is_in_partial_collection(*p), |
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108 "Referent should not be scavengable."); } |
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109 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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110 }; |
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111 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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112 #endif |
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113 |
0 | 114 void SharedHeap::change_strong_roots_parity() { |
115 // Also set the new collection parity. | |
116 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
117 "Not in range."); | |
118 _strong_roots_parity++; | |
119 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
120 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
121 "Not in range."); | |
122 } | |
123 | |
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124 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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125 : MarkScope(activate) |
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126 { |
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127 if (_active) { |
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128 outer->change_strong_roots_parity(); |
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129 // Zero the claimed high water mark in the StringTable |
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130 StringTable::clear_parallel_claimed_index(); |
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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 is_scavenging, |
0 | 140 ScanningOption so, |
141 OopClosure* roots, | |
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142 CodeBlobClosure* code_roots, |
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143 KlassClosure* klass_closure) { |
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144 StrongRootsScope srs(this, activate_scope); |
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145 |
0 | 146 // General strong roots. |
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147 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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148 // _n_termination for _process_strong_tasks should be set up stream |
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149 // in a method not running in a GC worker. Otherwise the GC worker |
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150 // could be trying to change the termination condition while the task |
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151 // is executing in another GC worker. |
0 | 152 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
153 Universe::oops_do(roots); | |
154 } | |
155 // Global (strong) JNI handles | |
156 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
157 JNIHandles::oops_do(roots); | |
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158 |
0 | 159 // All threads execute this; the individual threads are task groups. |
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160 CLDToOopClosure roots_from_clds(roots); |
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161 CLDToOopClosure* roots_from_clds_p = (is_scavenging ? NULL : &roots_from_clds); |
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162 if (CollectedHeap::use_parallel_gc_threads()) { |
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163 Threads::possibly_parallel_oops_do(roots, roots_from_clds_p, code_roots); |
0 | 164 } else { |
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165 Threads::oops_do(roots, roots_from_clds_p, code_roots); |
0 | 166 } |
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167 |
0 | 168 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
169 ObjectSynchronizer::oops_do(roots); | |
170 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
171 FlatProfiler::oops_do(roots); | |
172 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
173 Management::oops_do(roots); | |
174 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
175 JvmtiExport::oops_do(roots); | |
176 | |
177 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
178 if (so & SO_AllClasses) { | |
179 SystemDictionary::oops_do(roots); | |
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180 } else if (so & SO_SystemClasses) { |
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181 SystemDictionary::always_strong_oops_do(roots); |
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182 } else { |
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183 fatal("We should always have selected either SO_AllClasses or SO_SystemClasses"); |
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184 } |
0 | 185 } |
186 | |
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187 if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) { |
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188 if (so & SO_AllClasses) { |
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189 ClassLoaderDataGraph::oops_do(roots, klass_closure, !is_scavenging); |
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190 } else if (so & SO_SystemClasses) { |
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191 ClassLoaderDataGraph::always_strong_oops_do(roots, klass_closure, !is_scavenging); |
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192 } |
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193 } |
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194 |
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195 // All threads execute the following. A specific chunk of buckets |
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196 // from the StringTable are the individual tasks. |
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197 if (so & SO_Strings) { |
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198 if (CollectedHeap::use_parallel_gc_threads()) { |
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199 StringTable::possibly_parallel_oops_do(roots); |
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200 } else { |
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201 StringTable::oops_do(roots); |
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202 } |
0 | 203 } |
204 | |
205 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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206 if (so & SO_CodeCache) { |
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207 assert(code_roots != NULL, "must supply closure for code cache"); |
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208 |
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209 if (is_scavenging) { |
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210 // We only visit parts of the CodeCache when scavenging. |
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211 CodeCache::scavenge_root_nmethods_do(code_roots); |
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212 } else { |
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213 // CMSCollector uses this to do intermediate-strength collections. |
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214 // We scan the entire code cache, since CodeCache::do_unloading is not called. |
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215 CodeCache::blobs_do(code_roots); |
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216 } |
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217 } |
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218 // Verify that the code cache contents are not subject to |
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219 // movement by a scavenging collection. |
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220 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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221 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
0 | 222 } |
223 | |
224 _process_strong_tasks->all_tasks_completed(); | |
225 } | |
226 | |
227 class AlwaysTrueClosure: public BoolObjectClosure { | |
228 public: | |
229 bool do_object_b(oop p) { return true; } | |
230 }; | |
231 static AlwaysTrueClosure always_true; | |
232 | |
233 void SharedHeap::process_weak_roots(OopClosure* root_closure, | |
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234 CodeBlobClosure* code_roots) { |
0 | 235 // Global (weak) JNI handles |
236 JNIHandles::weak_oops_do(&always_true, root_closure); | |
237 | |
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238 CodeCache::blobs_do(code_roots); |
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239 StringTable::oops_do(root_closure); |
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240 } |
0 | 241 |
242 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
243 _barrier_set = bs; | |
244 // Cached barrier set for fast access in oops | |
245 oopDesc::set_bs(bs); | |
246 } | |
247 | |
248 void SharedHeap::post_initialize() { | |
249 ref_processing_init(); | |
250 } | |
251 | |
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252 void SharedHeap::ref_processing_init() {} |
0 | 253 |
254 // Some utilities. | |
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255 void SharedHeap::print_size_transition(outputStream* out, |
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256 size_t bytes_before, |
0 | 257 size_t bytes_after, |
258 size_t capacity) { | |
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259 out->print(" %d%s->%d%s(%d%s)", |
0 | 260 byte_size_in_proper_unit(bytes_before), |
261 proper_unit_for_byte_size(bytes_before), | |
262 byte_size_in_proper_unit(bytes_after), | |
263 proper_unit_for_byte_size(bytes_after), | |
264 byte_size_in_proper_unit(capacity), | |
265 proper_unit_for_byte_size(capacity)); | |
266 } |