author | kbarrett |
Tue, 05 Mar 2019 19:54:33 -0500 | |
changeset 54006 | a421bdf22394 |
parent 53850 | f42c58bab973 |
child 54073 | ee53a278b9d8 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/g1/g1BarrierSet.hpp" |
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#include "gc/shenandoah/shenandoahAsserts.hpp" |
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#include "gc/shenandoah/shenandoahBarrierSet.hpp" |
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#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp" |
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#include "gc/shenandoah/shenandoahCollectorPolicy.hpp" |
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#include "gc/shenandoah/shenandoahHeap.inline.hpp" |
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#include "gc/shenandoah/shenandoahHeuristics.hpp" |
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#include "gc/shenandoah/shenandoahTraversalGC.hpp" |
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#include "memory/iterator.inline.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#ifdef COMPILER1 |
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#include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp" |
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#endif |
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#ifdef COMPILER2 |
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#include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp" |
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#endif |
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class ShenandoahBarrierSetC1; |
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class ShenandoahBarrierSetC2; |
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template <bool STOREVAL_WRITE_BARRIER> |
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class ShenandoahUpdateRefsForOopClosure: public BasicOopIterateClosure { |
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private: |
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ShenandoahHeap* _heap; |
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ShenandoahBarrierSet* _bs; |
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template <class T> |
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inline void do_oop_work(T* p) { |
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oop o; |
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if (STOREVAL_WRITE_BARRIER) { |
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o = _heap->evac_update_with_forwarded(p); |
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if (!CompressedOops::is_null(o)) { |
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_bs->enqueue(o); |
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} |
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} else { |
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_heap->maybe_update_with_forwarded(p); |
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} |
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} |
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public: |
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ShenandoahUpdateRefsForOopClosure() : _heap(ShenandoahHeap::heap()), _bs(ShenandoahBarrierSet::barrier_set()) { |
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assert(UseShenandoahGC && ShenandoahCloneBarrier, "should be enabled"); |
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} |
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virtual void do_oop(oop* p) { do_oop_work(p); } |
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virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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}; |
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ShenandoahBarrierSet::ShenandoahBarrierSet(ShenandoahHeap* heap) : |
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BarrierSet(make_barrier_set_assembler<ShenandoahBarrierSetAssembler>(), |
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make_barrier_set_c1<ShenandoahBarrierSetC1>(), |
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make_barrier_set_c2<ShenandoahBarrierSetC2>(), |
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NULL /* barrier_set_nmethod */, |
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BarrierSet::FakeRtti(BarrierSet::ShenandoahBarrierSet)), |
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_heap(heap), |
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_satb_mark_queue_set() |
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{ |
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} |
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ShenandoahBarrierSetAssembler* ShenandoahBarrierSet::assembler() { |
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BarrierSetAssembler* const bsa = BarrierSet::barrier_set()->barrier_set_assembler(); |
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return reinterpret_cast<ShenandoahBarrierSetAssembler*>(bsa); |
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} |
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void ShenandoahBarrierSet::print_on(outputStream* st) const { |
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st->print("ShenandoahBarrierSet"); |
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} |
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bool ShenandoahBarrierSet::is_a(BarrierSet::Name bsn) { |
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return bsn == BarrierSet::ShenandoahBarrierSet; |
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} |
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bool ShenandoahBarrierSet::is_aligned(HeapWord* hw) { |
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return true; |
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} |
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template <class T, bool STOREVAL_WRITE_BARRIER> |
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void ShenandoahBarrierSet::write_ref_array_loop(HeapWord* start, size_t count) { |
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assert(UseShenandoahGC && ShenandoahCloneBarrier, "should be enabled"); |
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ShenandoahUpdateRefsForOopClosure<STOREVAL_WRITE_BARRIER> cl; |
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104 |
T* dst = (T*) start; |
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105 |
for (size_t i = 0; i < count; i++) { |
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106 |
cl.do_oop(dst++); |
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107 |
} |
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108 |
} |
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109 |
|
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110 |
void ShenandoahBarrierSet::write_ref_array(HeapWord* start, size_t count) { |
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111 |
assert(UseShenandoahGC, "should be enabled"); |
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112 |
if (count == 0) return; |
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113 |
if (!ShenandoahCloneBarrier) return; |
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114 |
|
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115 |
if (!need_update_refs_barrier()) return; |
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116 |
|
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117 |
if (_heap->is_concurrent_traversal_in_progress()) { |
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118 |
ShenandoahEvacOOMScope oom_evac_scope; |
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119 |
if (UseCompressedOops) { |
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120 |
write_ref_array_loop<narrowOop, /* wb = */ true>(start, count); |
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121 |
} else { |
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122 |
write_ref_array_loop<oop, /* wb = */ true>(start, count); |
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123 |
} |
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124 |
} else { |
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125 |
if (UseCompressedOops) { |
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126 |
write_ref_array_loop<narrowOop, /* wb = */ false>(start, count); |
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127 |
} else { |
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128 |
write_ref_array_loop<oop, /* wb = */ false>(start, count); |
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129 |
} |
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130 |
} |
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131 |
} |
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132 |
|
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133 |
template <class T> |
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134 |
void ShenandoahBarrierSet::write_ref_array_pre_work(T* dst, size_t count) { |
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135 |
shenandoah_assert_not_in_cset_loc_except(dst, _heap->cancelled_gc()); |
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136 |
if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) { |
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137 |
T* elem_ptr = dst; |
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138 |
for (size_t i = 0; i < count; i++, elem_ptr++) { |
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139 |
T heap_oop = RawAccess<>::oop_load(elem_ptr); |
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140 |
if (!CompressedOops::is_null(heap_oop)) { |
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141 |
enqueue(CompressedOops::decode_not_null(heap_oop)); |
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142 |
} |
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143 |
} |
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144 |
} |
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145 |
} |
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|
146 |
|
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147 |
void ShenandoahBarrierSet::write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized) { |
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148 |
if (! dest_uninitialized) { |
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149 |
write_ref_array_pre_work(dst, count); |
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150 |
} |
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151 |
} |
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|
152 |
|
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153 |
void ShenandoahBarrierSet::write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized) { |
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154 |
if (! dest_uninitialized) { |
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155 |
write_ref_array_pre_work(dst, count); |
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|
156 |
} |
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|
157 |
} |
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|
158 |
|
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|
159 |
template <class T> |
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160 |
inline void ShenandoahBarrierSet::inline_write_ref_field_pre(T* field, oop new_val) { |
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|
161 |
shenandoah_assert_not_in_cset_loc_except(field, _heap->cancelled_gc()); |
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|
162 |
if (_heap->is_concurrent_mark_in_progress()) { |
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|
163 |
T heap_oop = RawAccess<>::oop_load(field); |
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|
164 |
if (!CompressedOops::is_null(heap_oop)) { |
9c18c9d839d3
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|
165 |
enqueue(CompressedOops::decode(heap_oop)); |
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|
166 |
} |
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|
167 |
} |
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|
168 |
} |
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|
169 |
|
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|
170 |
// These are the more general virtual versions. |
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|
171 |
void ShenandoahBarrierSet::write_ref_field_pre_work(oop* field, oop new_val) { |
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|
172 |
inline_write_ref_field_pre(field, new_val); |
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|
173 |
} |
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|
174 |
|
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|
175 |
void ShenandoahBarrierSet::write_ref_field_pre_work(narrowOop* field, oop new_val) { |
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|
176 |
inline_write_ref_field_pre(field, new_val); |
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|
177 |
} |
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|
178 |
|
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|
179 |
void ShenandoahBarrierSet::write_ref_field_pre_work(void* field, oop new_val) { |
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|
180 |
guarantee(false, "Not needed"); |
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|
181 |
} |
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|
182 |
|
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|
183 |
void ShenandoahBarrierSet::write_ref_field_work(void* v, oop o, bool release) { |
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|
184 |
shenandoah_assert_not_in_cset_loc_except(v, _heap->cancelled_gc()); |
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|
185 |
shenandoah_assert_not_forwarded_except (v, o, o == NULL || _heap->cancelled_gc() || !_heap->is_concurrent_mark_in_progress()); |
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|
186 |
shenandoah_assert_not_in_cset_except (v, o, o == NULL || _heap->cancelled_gc() || !_heap->is_concurrent_mark_in_progress()); |
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|
187 |
} |
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|
188 |
|
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|
189 |
void ShenandoahBarrierSet::write_region(MemRegion mr) { |
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|
190 |
assert(UseShenandoahGC, "should be enabled"); |
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|
191 |
if (!ShenandoahCloneBarrier) return; |
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|
192 |
if (! need_update_refs_barrier()) return; |
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|
193 |
|
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194 |
// This is called for cloning an object (see jvm.cpp) after the clone |
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195 |
// has been made. We are not interested in any 'previous value' because |
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196 |
// it would be NULL in any case. But we *are* interested in any oop* |
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197 |
// that potentially need to be updated. |
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|
198 |
|
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199 |
oop obj = oop(mr.start()); |
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|
200 |
shenandoah_assert_correct(NULL, obj); |
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|
201 |
if (_heap->is_concurrent_traversal_in_progress()) { |
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|
202 |
ShenandoahEvacOOMScope oom_evac_scope; |
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|
203 |
ShenandoahUpdateRefsForOopClosure</* wb = */ true> cl; |
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|
204 |
obj->oop_iterate(&cl); |
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|
205 |
} else { |
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ShenandoahUpdateRefsForOopClosure</* wb = */ false> cl; |
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obj->oop_iterate(&cl); |
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} |
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} |
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210 |
|
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oop ShenandoahBarrierSet::read_barrier(oop src) { |
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// Check for forwarded objects, because on Full GC path we might deal with |
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// non-trivial fwdptrs that contain Full GC specific metadata. We could check |
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// for is_full_gc_in_progress(), but this also covers the case of stable heap, |
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// which provides a bit of performance improvement. |
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if (ShenandoahReadBarrier && _heap->has_forwarded_objects()) { |
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return ShenandoahBarrierSet::resolve_forwarded(src); |
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} else { |
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return src; |
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} |
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221 |
} |
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222 |
|
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bool ShenandoahBarrierSet::obj_equals(oop obj1, oop obj2) { |
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bool eq = oopDesc::equals_raw(obj1, obj2); |
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if (! eq && ShenandoahAcmpBarrier) { |
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OrderAccess::loadload(); |
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obj1 = resolve_forwarded(obj1); |
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obj2 = resolve_forwarded(obj2); |
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eq = oopDesc::equals_raw(obj1, obj2); |
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230 |
} |
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return eq; |
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232 |
} |
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233 |
|
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234 |
oop ShenandoahBarrierSet::write_barrier_mutator(oop obj) { |
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235 |
assert(UseShenandoahGC && ShenandoahWriteBarrier, "should be enabled"); |
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assert(_heap->is_gc_in_progress_mask(ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL), "evac should be in progress"); |
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237 |
shenandoah_assert_in_cset(NULL, obj); |
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238 |
|
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oop fwd = resolve_forwarded_not_null(obj); |
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if (oopDesc::equals_raw(obj, fwd)) { |
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241 |
ShenandoahEvacOOMScope oom_evac_scope; |
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242 |
|
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Thread* thread = Thread::current(); |
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oop res_oop = _heap->evacuate_object(obj, thread); |
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245 |
|
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// Since we are already here and paid the price of getting through runtime call adapters |
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247 |
// and acquiring oom-scope, it makes sense to try and evacuate more adjacent objects, |
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// thus amortizing the overhead. For sparsely live heaps, scan costs easily dominate |
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249 |
// total assist costs, and can introduce a lot of evacuation latency. This is why we |
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250 |
// only scan for _nearest_ N objects, regardless if they are eligible for evac or not. |
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251 |
// The scan itself should also avoid touching the non-marked objects below TAMS, because |
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252 |
// their metadata (notably, klasses) may be incorrect already. |
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253 |
|
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254 |
size_t max = ShenandoahEvacAssist; |
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if (max > 0) { |
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256 |
// Traversal is special: it uses incomplete marking context, because it coalesces evac with mark. |
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// Other code uses complete marking context, because evac happens after the mark. |
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258 |
ShenandoahMarkingContext* ctx = _heap->is_concurrent_traversal_in_progress() ? |
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259 |
_heap->marking_context() : _heap->complete_marking_context(); |
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260 |
|
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261 |
ShenandoahHeapRegion* r = _heap->heap_region_containing(obj); |
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262 |
assert(r->is_cset(), "sanity"); |
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263 |
|
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264 |
HeapWord* cur = (HeapWord*)obj + obj->size() + ShenandoahBrooksPointer::word_size(); |
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265 |
|
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266 |
size_t count = 0; |
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267 |
while ((cur < r->top()) && ctx->is_marked(oop(cur)) && (count++ < max)) { |
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268 |
oop cur_oop = oop(cur); |
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269 |
if (oopDesc::equals_raw(cur_oop, resolve_forwarded_not_null(cur_oop))) { |
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|
270 |
_heap->evacuate_object(cur_oop, thread); |
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271 |
} |
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cur = cur + cur_oop->size() + ShenandoahBrooksPointer::word_size(); |
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273 |
} |
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274 |
} |
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|
275 |
|
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276 |
return res_oop; |
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|
277 |
} |
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278 |
return fwd; |
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279 |
} |
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|
280 |
|
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281 |
oop ShenandoahBarrierSet::write_barrier_impl(oop obj) { |
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|
282 |
assert(UseShenandoahGC && ShenandoahWriteBarrier, "should be enabled"); |
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|
283 |
if (!CompressedOops::is_null(obj)) { |
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284 |
bool evac_in_progress = _heap->is_gc_in_progress_mask(ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL); |
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285 |
oop fwd = resolve_forwarded_not_null(obj); |
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286 |
if (evac_in_progress && |
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287 |
_heap->in_collection_set(obj) && |
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288 |
oopDesc::equals_raw(obj, fwd)) { |
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289 |
Thread *t = Thread::current(); |
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290 |
if (t->is_GC_task_thread()) { |
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291 |
return _heap->evacuate_object(obj, t); |
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292 |
} else { |
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293 |
ShenandoahEvacOOMScope oom_evac_scope; |
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294 |
return _heap->evacuate_object(obj, t); |
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295 |
} |
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296 |
} else { |
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297 |
return fwd; |
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298 |
} |
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299 |
} else { |
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300 |
return obj; |
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301 |
} |
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302 |
} |
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303 |
|
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304 |
oop ShenandoahBarrierSet::write_barrier(oop obj) { |
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305 |
if (ShenandoahWriteBarrier && _heap->has_forwarded_objects()) { |
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306 |
return write_barrier_impl(obj); |
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307 |
} else { |
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308 |
return obj; |
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} |
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} |
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|
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oop ShenandoahBarrierSet::storeval_barrier(oop obj) { |
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if (ShenandoahStoreValEnqueueBarrier) { |
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if (!CompressedOops::is_null(obj)) { |
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obj = write_barrier(obj); |
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enqueue(obj); |
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} |
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} |
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if (ShenandoahStoreValReadBarrier) { |
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obj = resolve_forwarded(obj); |
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} |
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return obj; |
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} |
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|
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void ShenandoahBarrierSet::keep_alive_barrier(oop obj) { |
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if (ShenandoahKeepAliveBarrier && _heap->is_concurrent_mark_in_progress()) { |
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enqueue(obj); |
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} |
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} |
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|
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void ShenandoahBarrierSet::enqueue(oop obj) { |
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shenandoah_assert_not_forwarded_if(NULL, obj, _heap->is_concurrent_traversal_in_progress()); |
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if (!_satb_mark_queue_set.is_active()) return; |
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|
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// Filter marked objects before hitting the SATB queues. The same predicate would |
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// be used by SATBMQ::filter to eliminate already marked objects downstream, but |
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// filtering here helps to avoid wasteful SATB queueing work to begin with. |
53850 | 338 |
if (!_heap->requires_marking<false>(obj)) return; |
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|
54006 | 340 |
ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).enqueue(obj); |
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} |
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void ShenandoahBarrierSet::on_thread_create(Thread* thread) { |
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// Create thread local data |
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ShenandoahThreadLocalData::create(thread); |
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} |
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void ShenandoahBarrierSet::on_thread_destroy(Thread* thread) { |
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// Destroy thread local data |
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ShenandoahThreadLocalData::destroy(thread); |
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} |
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|
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void ShenandoahBarrierSet::on_thread_attach(Thread *thread) { |
354 |
assert(!thread->is_Java_thread() || !SafepointSynchronize::is_at_safepoint(), |
|
355 |
"We should not be at a safepoint"); |
|
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SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(thread); |
|
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assert(!queue.is_active(), "SATB queue should not be active"); |
|
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assert( queue.is_empty(), "SATB queue should be empty"); |
|
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queue.set_active(_satb_mark_queue_set.is_active()); |
|
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if (thread->is_Java_thread()) { |
|
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ShenandoahThreadLocalData::set_gc_state(thread, _heap->gc_state()); |
|
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ShenandoahThreadLocalData::initialize_gclab(thread); |
|
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} |
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} |
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|
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void ShenandoahBarrierSet::on_thread_detach(Thread *thread) { |
367 |
SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(thread); |
|
368 |
queue.flush(); |
|
369 |
if (thread->is_Java_thread()) { |
|
370 |
PLAB* gclab = ShenandoahThreadLocalData::gclab(thread); |
|
371 |
if (gclab != NULL) { |
|
372 |
gclab->retire(); |
|
373 |
} |
|
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} |
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} |