Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | 9a9bb0010c91 |
children | aed758eda82a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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/systemDictionary.hpp" | |
27 #include "gc_implementation/shared/vmGCOperations.hpp" | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "oops/oop.inline.hpp" | |
4009 | 31 #include "oops/instanceMirrorKlass.hpp" |
1972 | 32 #include "runtime/init.hpp" |
33 #include "services/heapDumper.hpp" | |
34 #ifdef TARGET_OS_FAMILY_linux | |
35 # include "thread_linux.inline.hpp" | |
36 #endif | |
37 #ifdef TARGET_OS_FAMILY_solaris | |
38 # include "thread_solaris.inline.hpp" | |
39 #endif | |
40 #ifdef TARGET_OS_FAMILY_windows | |
41 # include "thread_windows.inline.hpp" | |
42 #endif | |
3960 | 43 #ifdef TARGET_OS_FAMILY_bsd |
44 # include "thread_bsd.inline.hpp" | |
45 #endif | |
0 | 46 |
47 | |
48 #ifdef ASSERT | |
49 int CollectedHeap::_fire_out_of_memory_count = 0; | |
50 #endif | |
51 | |
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52 size_t CollectedHeap::_filler_array_max_size = 0; |
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53 |
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54 template <> |
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55 void EventLogBase<GCMessage>::print(outputStream* st, GCMessage& m) { |
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56 st->print_cr("GC heap %s", m.is_before ? "before" : "after"); |
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57 st->print_raw(m); |
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58 } |
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59 |
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60 void GCHeapLog::log_heap(bool before) { |
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61 if (!should_log()) { |
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62 return; |
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63 } |
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64 |
4944 | 65 double timestamp = fetch_timestamp(); |
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66 MutexLockerEx ml(&_mutex, Mutex::_no_safepoint_check_flag); |
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67 int index = compute_log_index(); |
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68 _records[index].thread = NULL; // Its the GC thread so it's not that interesting. |
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69 _records[index].timestamp = timestamp; |
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70 _records[index].data.is_before = before; |
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71 stringStream st(_records[index].data.buffer(), _records[index].data.size()); |
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72 if (before) { |
4944 | 73 Universe::print_heap_before_gc(&st, true); |
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74 } else { |
4944 | 75 Universe::print_heap_after_gc(&st, true); |
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76 } |
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77 } |
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78 |
0 | 79 // Memory state functions. |
80 | |
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81 |
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82 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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83 |
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84 { |
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85 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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86 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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87 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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88 max_len / elements_per_word); |
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89 |
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90 _barrier_set = NULL; |
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91 _is_gc_active = false; |
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92 _total_collections = _total_full_collections = 0; |
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93 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 94 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
95 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
96 | |
97 if (UsePerfData) { | |
98 EXCEPTION_MARK; | |
99 | |
100 // create the gc cause jvmstat counters | |
101 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
102 80, GCCause::to_string(_gc_cause), CHECK); | |
103 | |
104 _perf_gc_lastcause = | |
105 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
106 80, GCCause::to_string(_gc_lastcause), CHECK); | |
107 } | |
1166 | 108 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
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109 // Create the ring log |
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110 if (LogEvents) { |
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111 _gc_heap_log = new GCHeapLog(); |
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112 } else { |
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113 _gc_heap_log = NULL; |
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114 } |
0 | 115 } |
116 | |
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117 // This interface assumes that it's being called by the |
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118 // vm thread. It collects the heap assuming that the |
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119 // heap lock is already held and that we are executing in |
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120 // the context of the vm thread. |
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121 void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
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122 assert(Thread::current()->is_VM_thread(), "Precondition#1"); |
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123 assert(Heap_lock->is_locked(), "Precondition#2"); |
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124 GCCauseSetter gcs(this, cause); |
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125 switch (cause) { |
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126 case GCCause::_heap_inspection: |
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127 case GCCause::_heap_dump: |
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128 case GCCause::_metadata_GC_threshold : { |
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129 HandleMark hm; |
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130 do_full_collection(false); // don't clear all soft refs |
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131 break; |
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132 } |
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133 case GCCause::_last_ditch_collection: { |
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134 HandleMark hm; |
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135 do_full_collection(true); // do clear all soft refs |
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136 break; |
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137 } |
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138 default: |
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139 ShouldNotReachHere(); // Unexpected use of this function |
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140 } |
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141 } |
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142 MetaWord* CollectedHeap::satisfy_failed_metadata_allocation( |
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143 ClassLoaderData* loader_data, |
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144 size_t size, Metaspace::MetadataType mdtype) { |
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145 return collector_policy()->satisfy_failed_metadata_allocation(loader_data, size, mdtype); |
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146 } |
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147 |
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148 |
1166 | 149 void CollectedHeap::pre_initialize() { |
150 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
151 // otherwise remains unused. | |
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152 #ifdef COMPILER2 |
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153 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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154 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 155 #else |
156 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
157 #endif | |
158 } | |
0 | 159 |
160 #ifndef PRODUCT | |
161 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
162 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
163 for (size_t slot = 0; slot < size; slot += 1) { | |
164 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
165 "Found badHeapWordValue in post-allocation check"); | |
166 } | |
167 } | |
168 } | |
169 | |
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170 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 171 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
172 for (size_t slot = 0; slot < size; slot += 1) { | |
173 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
174 "Found non badHeapWordValue in pre-allocation check"); | |
175 } | |
176 } | |
177 } | |
178 #endif // PRODUCT | |
179 | |
180 #ifdef ASSERT | |
181 void CollectedHeap::check_for_valid_allocation_state() { | |
182 Thread *thread = Thread::current(); | |
183 // How to choose between a pending exception and a potential | |
184 // OutOfMemoryError? Don't allow pending exceptions. | |
185 // This is a VM policy failure, so how do we exhaustively test it? | |
186 assert(!thread->has_pending_exception(), | |
187 "shouldn't be allocating with pending exception"); | |
188 if (StrictSafepointChecks) { | |
189 assert(thread->allow_allocation(), | |
190 "Allocation done by thread for which allocation is blocked " | |
191 "by No_Allocation_Verifier!"); | |
192 // Allocation of an oop can always invoke a safepoint, | |
193 // hence, the true argument | |
194 thread->check_for_valid_safepoint_state(true); | |
195 } | |
196 } | |
197 #endif | |
198 | |
199 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
200 | |
201 // Retain tlab and allocate object in shared space if | |
202 // the amount free in the tlab is too large to discard. | |
203 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
204 thread->tlab().record_slow_allocation(size); | |
205 return NULL; | |
206 } | |
207 | |
208 // Discard tlab and allocate a new one. | |
209 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
210 size_t new_tlab_size = thread->tlab().compute_size(size); | |
211 | |
212 thread->tlab().clear_before_allocation(); | |
213 | |
214 if (new_tlab_size == 0) { | |
215 return NULL; | |
216 } | |
217 | |
218 // Allocate a new TLAB... | |
219 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
220 if (obj == NULL) { | |
221 return NULL; | |
222 } | |
223 if (ZeroTLAB) { | |
224 // ..and clear it. | |
225 Copy::zero_to_words(obj, new_tlab_size); | |
226 } else { | |
3892 | 227 // ...and zap just allocated object. |
228 #ifdef ASSERT | |
229 // Skip mangling the space corresponding to the object header to | |
230 // ensure that the returned space is not considered parsable by | |
231 // any concurrent GC thread. | |
232 size_t hdr_size = oopDesc::header_size(); | |
233 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
234 #endif // ASSERT | |
0 | 235 } |
236 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
237 return obj; | |
238 } | |
239 | |
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240 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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241 MemRegion deferred = thread->deferred_card_mark(); |
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242 if (!deferred.is_empty()) { |
1166 | 243 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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244 { |
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245 // Verify that the storage points to a parsable object in heap |
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246 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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247 assert(is_in(old_obj), "Not in allocated heap"); |
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248 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 249 "Else should have been filtered in new_store_pre_barrier()"); |
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250 assert(old_obj->is_oop(true), "Not an oop"); |
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251 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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252 "Mismatch: multiple objects?"); |
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253 } |
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254 BarrierSet* bs = barrier_set(); |
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255 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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256 bs->write_region(deferred); |
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257 // "Clear" the deferred_card_mark field |
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258 thread->set_deferred_card_mark(MemRegion()); |
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259 } |
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260 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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261 } |
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262 |
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263 // Helper for ReduceInitialCardMarks. For performance, |
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264 // compiled code may elide card-marks for initializing stores |
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265 // to a newly allocated object along the fast-path. We |
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266 // compensate for such elided card-marks as follows: |
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267 // (a) Generational, non-concurrent collectors, such as |
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268 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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269 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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270 // need the card-mark if and only if the region is |
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271 // in the old gen, and do not care if the card-mark |
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272 // succeeds or precedes the initializing stores themselves, |
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273 // so long as the card-mark is completed before the next |
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274 // scavenge. For all these cases, we can do a card mark |
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275 // at the point at which we do a slow path allocation |
1166 | 276 // in the old gen, i.e. in this call. |
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277 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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278 // in addition that the card-mark for an old gen allocated |
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279 // object strictly follow any associated initializing stores. |
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280 // In these cases, the memRegion remembered below is |
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281 // used to card-mark the entire region either just before the next |
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282 // slow-path allocation by this thread or just before the next scavenge or |
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283 // CMS-associated safepoint, whichever of these events happens first. |
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284 // (The implicit assumption is that the object has been fully |
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285 // initialized by this point, a fact that we assert when doing the |
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286 // card-mark.) |
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287 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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288 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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289 // is used to remember the pre-value of any store. Initializing |
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290 // stores will not need this barrier, so we need not worry about |
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291 // compensating for the missing pre-barrier here. Turning now |
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292 // to the post-barrier, we note that G1 needs a RS update barrier |
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293 // which simply enqueues a (sequence of) dirty cards which may |
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294 // optionally be refined by the concurrent update threads. Note |
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295 // that this barrier need only be applied to a non-young write, |
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296 // but, like in CMS, because of the presence of concurrent refinement |
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297 // (much like CMS' precleaning), must strictly follow the oop-store. |
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298 // Thus, using the same protocol for maintaining the intended |
1166 | 299 // invariants turns out, serendepitously, to be the same for both |
300 // G1 and CMS. | |
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301 // |
1166 | 302 // For any future collector, this code should be reexamined with |
303 // that specific collector in mind, and the documentation above suitably | |
304 // extended and updated. | |
305 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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306 // If a previous card-mark was deferred, flush it now. |
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307 flush_deferred_store_barrier(thread); |
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308 if (can_elide_initializing_store_barrier(new_obj)) { |
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309 // The deferred_card_mark region should be empty |
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310 // following the flush above. |
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311 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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312 } else { |
1166 | 313 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
314 assert(!mr.is_empty(), "Error"); | |
315 if (_defer_initial_card_mark) { | |
316 // Defer the card mark | |
317 thread->set_deferred_card_mark(mr); | |
318 } else { | |
319 // Do the card mark | |
320 BarrierSet* bs = barrier_set(); | |
321 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
322 bs->write_region(mr); | |
323 } | |
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324 } |
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325 return new_obj; |
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326 } |
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327 |
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328 size_t CollectedHeap::filler_array_hdr_size() { |
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329 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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330 } |
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331 |
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332 size_t CollectedHeap::filler_array_min_size() { |
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333 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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334 } |
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335 |
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336 #ifdef ASSERT |
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337 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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338 { |
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339 assert(words >= min_fill_size(), "too small to fill"); |
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340 assert(words % MinObjAlignment == 0, "unaligned size"); |
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341 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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342 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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343 } |
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344 |
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345 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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346 { |
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347 if (ZapFillerObjects && zap) { |
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348 Copy::fill_to_words(start + filler_array_hdr_size(), |
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349 words - filler_array_hdr_size(), 0XDEAFBABE); |
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350 } |
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351 } |
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352 #endif // ASSERT |
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353 |
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354 void |
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355 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
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356 { |
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357 assert(words >= filler_array_min_size(), "too small for an array"); |
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358 assert(words <= filler_array_max_size(), "too big for a single object"); |
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359 |
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360 const size_t payload_size = words - filler_array_hdr_size(); |
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361 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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362 assert((int)len >= 0, err_msg("size too large " SIZE_FORMAT " becomes %d", words, (int)len)); |
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363 |
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364 // Set the length first for concurrent GC. |
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365 ((arrayOop)start)->set_length((int)len); |
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366 post_allocation_setup_common(Universe::intArrayKlassObj(), start); |
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367 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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368 } |
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369 |
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370 void |
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371 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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372 { |
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373 assert(words <= filler_array_max_size(), "too big for a single object"); |
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374 |
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375 if (words >= filler_array_min_size()) { |
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376 fill_with_array(start, words, zap); |
481
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377 } else if (words > 0) { |
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378 assert(words == min_fill_size(), "unaligned size"); |
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379 post_allocation_setup_common(SystemDictionary::Object_klass(), start); |
481
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380 } |
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381 } |
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382 |
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383 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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384 { |
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385 DEBUG_ONLY(fill_args_check(start, words);) |
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386 HandleMark hm; // Free handles before leaving. |
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387 fill_with_object_impl(start, words, zap); |
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388 } |
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389 |
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390 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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391 { |
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392 DEBUG_ONLY(fill_args_check(start, words);) |
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393 HandleMark hm; // Free handles before leaving. |
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394 |
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395 #ifdef _LP64 |
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396 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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397 // First fill with arrays, ensuring that any remaining space is big enough to |
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398 // fill. The remainder is filled with a single object. |
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399 const size_t min = min_fill_size(); |
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400 const size_t max = filler_array_max_size(); |
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401 while (words > max) { |
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402 const size_t cur = words - max >= min ? max : max - min; |
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403 fill_with_array(start, cur, zap); |
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404 start += cur; |
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405 words -= cur; |
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406 } |
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407 #endif |
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408 |
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409 fill_with_object_impl(start, words, zap); |
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410 } |
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411 |
0 | 412 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
413 guarantee(false, "thread-local allocation buffers not supported"); | |
414 return NULL; | |
415 } | |
416 | |
417 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
418 // The second disjunct in the assertion below makes a concession | |
419 // for the start-up verification done while the VM is being | |
420 // created. Callers be careful that you know that mutators | |
421 // aren't going to interfere -- for instance, this is permissible | |
422 // if we are still single-threaded and have either not yet | |
423 // started allocating (nothing much to verify) or we have | |
424 // started allocating but are now a full-fledged JavaThread | |
425 // (and have thus made our TLAB's) available for filling. | |
426 assert(SafepointSynchronize::is_at_safepoint() || | |
427 !is_init_completed(), | |
428 "Should only be called at a safepoint or at start-up" | |
429 " otherwise concurrent mutator activity may make heap " | |
430 " unparsable again"); | |
1166 | 431 const bool use_tlab = UseTLAB; |
432 const bool deferred = _defer_initial_card_mark; | |
433 // The main thread starts allocating via a TLAB even before it | |
434 // has added itself to the threads list at vm boot-up. | |
435 assert(!use_tlab || Threads::first() != NULL, | |
436 "Attempt to fill tlabs before main thread has been added" | |
437 " to threads list is doomed to failure!"); | |
438 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
439 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
440 #ifdef COMPILER2 | |
441 // The deferred store barriers must all have been flushed to the | |
442 // card-table (or other remembered set structure) before GC starts | |
443 // processing the card-table (or other remembered set). | |
444 if (deferred) flush_deferred_store_barrier(thread); | |
445 #else | |
446 assert(!deferred, "Should be false"); | |
447 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
448 #endif | |
0 | 449 } |
450 } | |
451 | |
452 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
453 if (UseTLAB) { | |
454 assert(SafepointSynchronize::is_at_safepoint() || | |
455 !is_init_completed(), | |
456 "should only accumulate statistics on tlabs at safepoint"); | |
457 | |
458 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
459 } | |
460 } | |
461 | |
462 void CollectedHeap::resize_all_tlabs() { | |
463 if (UseTLAB) { | |
464 assert(SafepointSynchronize::is_at_safepoint() || | |
465 !is_init_completed(), | |
466 "should only resize tlabs at safepoint"); | |
467 | |
468 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
469 } | |
470 } | |
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471 |
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472 void CollectedHeap::pre_full_gc_dump() { |
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473 if (HeapDumpBeforeFullGC) { |
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474 TraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, gclog_or_tty); |
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475 // We are doing a "major" collection and a heap dump before |
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476 // major collection has been requested. |
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477 HeapDumper::dump_heap(); |
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478 } |
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479 if (PrintClassHistogramBeforeFullGC) { |
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480 TraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, gclog_or_tty); |
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481 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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482 inspector.doit(); |
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483 } |
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484 } |
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485 |
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486 void CollectedHeap::post_full_gc_dump() { |
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487 if (HeapDumpAfterFullGC) { |
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488 TraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, gclog_or_tty); |
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489 HeapDumper::dump_heap(); |
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490 } |
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491 if (PrintClassHistogramAfterFullGC) { |
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492 TraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, gclog_or_tty); |
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493 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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494 inspector.doit(); |
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495 } |
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496 } |
4009 | 497 |
498 oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) { | |
499 debug_only(check_for_valid_allocation_state()); | |
500 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
501 assert(size >= 0, "int won't convert to size_t"); | |
502 HeapWord* obj; | |
503 assert(ScavengeRootsInCode > 0, "must be"); | |
504 obj = common_mem_allocate_init(size, CHECK_NULL); | |
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505 post_allocation_setup_common(klass, obj); |
4009 | 506 assert(Universe::is_bootstrapping() || |
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507 !((oop)obj)->is_array(), "must not be an array"); |
4009 | 508 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); |
509 oop mirror = (oop)obj; | |
510 | |
511 java_lang_Class::set_oop_size(mirror, size); | |
512 | |
513 // Setup indirections | |
514 if (!real_klass.is_null()) { | |
515 java_lang_Class::set_klass(mirror, real_klass()); | |
516 real_klass->set_java_mirror(mirror); | |
517 } | |
518 | |
519 instanceMirrorKlass* mk = instanceMirrorKlass::cast(mirror->klass()); | |
520 assert(size == mk->instance_size(real_klass), "should have been set"); | |
521 | |
522 // notify jvmti and dtrace | |
523 post_allocation_notify(klass, (oop)obj); | |
524 | |
525 return mirror; | |
526 } | |
4708 | 527 |
528 /////////////// Unit tests /////////////// | |
529 | |
530 #ifndef PRODUCT | |
531 void CollectedHeap::test_is_in() { | |
532 CollectedHeap* heap = Universe::heap(); | |
533 | |
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534 uintptr_t epsilon = (uintptr_t) MinObjAlignment; |
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535 uintptr_t heap_start = (uintptr_t) heap->_reserved.start(); |
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536 uintptr_t heap_end = (uintptr_t) heap->_reserved.end(); |
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537 |
4708 | 538 // Test that NULL is not in the heap. |
539 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap"); | |
540 | |
541 // Test that a pointer to before the heap start is reported as outside the heap. | |
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542 assert(heap_start >= ((uintptr_t)NULL + epsilon), "sanity"); |
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543 void* before_heap = (void*)(heap_start - epsilon); |
4708 | 544 assert(!heap->is_in(before_heap), |
545 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", before_heap)); | |
546 | |
547 // Test that a pointer to after the heap end is reported as outside the heap. | |
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548 assert(heap_end <= ((uintptr_t)-1 - epsilon), "sanity"); |
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549 void* after_heap = (void*)(heap_end + epsilon); |
4708 | 550 assert(!heap->is_in(after_heap), |
551 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", after_heap)); | |
552 } | |
553 #endif |