author | rkennke |
Mon, 18 Mar 2019 16:33:28 +0100 | |
changeset 54179 | e81b44c68680 |
parent 53244 | 9807daeb47c4 |
child 54383 | cdc3bb0983a6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2018, 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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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP |
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#define SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP |
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#include "gc/shared/barrierSet.hpp" |
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#include "gc/shenandoah/shenandoahBarrierSet.hpp" |
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#include "gc/shenandoah/shenandoahBrooksPointer.inline.hpp" |
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#include "gc/shenandoah/shenandoahHeap.inline.hpp" |
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bool ShenandoahBarrierSet::need_update_refs_barrier() { |
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return _heap->is_update_refs_in_progress() || |
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_heap->is_concurrent_traversal_in_progress() || |
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(_heap->is_concurrent_mark_in_progress() && _heap->has_forwarded_objects()); |
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} |
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inline oop ShenandoahBarrierSet::resolve_forwarded_not_null(oop p) { |
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return ShenandoahBrooksPointer::forwardee(p); |
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} |
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inline oop ShenandoahBarrierSet::resolve_forwarded(oop p) { |
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if (((HeapWord*) p) != NULL) { |
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return resolve_forwarded_not_null(p); |
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} else { |
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return p; |
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} |
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} |
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template <DecoratorSet decorators, typename BarrierSetT> |
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template <typename T> |
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inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value) { |
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oop res; |
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oop expected = compare_value; |
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do { |
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compare_value = expected; |
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res = Raw::oop_atomic_cmpxchg(new_value, addr, compare_value); |
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expected = res; |
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} while ((! oopDesc::equals_raw(compare_value, expected)) && oopDesc::equals_raw(resolve_forwarded(compare_value), resolve_forwarded(expected))); |
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if (oopDesc::equals_raw(expected, compare_value)) { |
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const bool keep_alive = (decorators & AS_NO_KEEPALIVE) == 0; |
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if (keep_alive && ShenandoahSATBBarrier && !CompressedOops::is_null(compare_value)) { |
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ShenandoahBarrierSet::barrier_set()->enqueue(compare_value); |
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} |
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} |
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return res; |
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} |
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template <DecoratorSet decorators, typename BarrierSetT> |
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template <typename T> |
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inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_in_heap(oop new_value, T* addr) { |
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oop previous = Raw::oop_atomic_xchg(new_value, addr); |
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if (ShenandoahSATBBarrier) { |
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const bool keep_alive = (decorators & AS_NO_KEEPALIVE) == 0; |
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if (keep_alive && !CompressedOops::is_null(previous)) { |
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ShenandoahBarrierSet::barrier_set()->enqueue(previous); |
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} |
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} |
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return previous; |
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} |
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template <DecoratorSet decorators, typename BarrierSetT> |
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template <typename T> |
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void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, |
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arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, |
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size_t length) { |
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if (!CompressedOops::is_null(src_obj)) { |
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src_obj = arrayOop(ShenandoahBarrierSet::barrier_set()->read_barrier(src_obj)); |
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} |
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if (!CompressedOops::is_null(dst_obj)) { |
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dst_obj = arrayOop(ShenandoahBarrierSet::barrier_set()->write_barrier(dst_obj)); |
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} |
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Raw::arraycopy(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length); |
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} |
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template <typename T> |
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bool ShenandoahBarrierSet::arraycopy_loop_1(T* src, T* dst, size_t length, Klass* bound, |
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bool checkcast, bool satb, bool disjoint, |
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ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) { |
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if (checkcast) { |
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return arraycopy_loop_2<T, true>(src, dst, length, bound, satb, disjoint, storeval_mode); |
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102 |
} else { |
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103 |
return arraycopy_loop_2<T, false>(src, dst, length, bound, satb, disjoint, storeval_mode); |
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|
104 |
} |
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105 |
} |
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|
106 |
|
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107 |
template <typename T, bool CHECKCAST> |
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108 |
bool ShenandoahBarrierSet::arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound, |
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109 |
bool satb, bool disjoint, |
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110 |
ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) { |
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111 |
if (satb) { |
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112 |
return arraycopy_loop_3<T, CHECKCAST, true>(src, dst, length, bound, disjoint, storeval_mode); |
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|
113 |
} else { |
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114 |
return arraycopy_loop_3<T, CHECKCAST, false>(src, dst, length, bound, disjoint, storeval_mode); |
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|
115 |
} |
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116 |
} |
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117 |
|
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118 |
template <typename T, bool CHECKCAST, bool SATB> |
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119 |
bool ShenandoahBarrierSet::arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound, bool disjoint, |
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120 |
ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) { |
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121 |
switch (storeval_mode) { |
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122 |
case NONE: |
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123 |
return arraycopy_loop<T, CHECKCAST, SATB, NONE>(src, dst, length, bound, disjoint); |
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124 |
case READ_BARRIER: |
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125 |
return arraycopy_loop<T, CHECKCAST, SATB, READ_BARRIER>(src, dst, length, bound, disjoint); |
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126 |
case WRITE_BARRIER: |
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127 |
return arraycopy_loop<T, CHECKCAST, SATB, WRITE_BARRIER>(src, dst, length, bound, disjoint); |
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|
128 |
default: |
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129 |
ShouldNotReachHere(); |
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130 |
return true; // happy compiler |
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131 |
} |
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132 |
} |
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|
133 |
|
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134 |
template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> |
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|
135 |
bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint) { |
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|
136 |
Thread* thread = Thread::current(); |
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|
137 |
|
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138 |
ShenandoahEvacOOMScope oom_evac_scope; |
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|
139 |
|
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140 |
// We need to handle four cases: |
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141 |
// |
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142 |
// a) src < dst, conjoint, can only copy backward only |
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143 |
// [...src...] |
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144 |
// [...dst...] |
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145 |
// |
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146 |
// b) src < dst, disjoint, can only copy forward, because types may mismatch |
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147 |
// [...src...] |
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148 |
// [...dst...] |
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149 |
// |
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150 |
// c) src > dst, conjoint, can copy forward only |
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151 |
// [...src...] |
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152 |
// [...dst...] |
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153 |
// |
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154 |
// d) src > dst, disjoint, can only copy forward, because types may mismatch |
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|
155 |
// [...src...] |
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156 |
// [...dst...] |
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|
157 |
// |
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|
158 |
if (src > dst || disjoint) { |
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|
159 |
// copy forward: |
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|
160 |
T* cur_src = src; |
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|
161 |
T* cur_dst = dst; |
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|
162 |
T* src_end = src + length; |
9c18c9d839d3
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|
163 |
for (; cur_src < src_end; cur_src++, cur_dst++) { |
9c18c9d839d3
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|
164 |
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread)) { |
9c18c9d839d3
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|
165 |
return false; |
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|
166 |
} |
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|
167 |
} |
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|
168 |
} else { |
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|
169 |
// copy backward: |
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|
170 |
T* cur_src = src + length - 1; |
9c18c9d839d3
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|
171 |
T* cur_dst = dst + length - 1; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
172 |
for (; cur_src >= src; cur_src--, cur_dst--) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
173 |
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread)) { |
9c18c9d839d3
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|
174 |
return false; |
9c18c9d839d3
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|
175 |
} |
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|
176 |
} |
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|
177 |
} |
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|
178 |
return true; |
9c18c9d839d3
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|
179 |
} |
9c18c9d839d3
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|
180 |
|
9c18c9d839d3
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|
181 |
template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> |
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|
182 |
bool ShenandoahBarrierSet::arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* thread) { |
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|
183 |
T o = RawAccess<>::oop_load(cur_src); |
9c18c9d839d3
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|
184 |
|
9c18c9d839d3
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|
185 |
if (SATB) { |
9c18c9d839d3
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|
186 |
T prev = RawAccess<>::oop_load(cur_dst); |
9c18c9d839d3
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|
187 |
if (!CompressedOops::is_null(prev)) { |
9c18c9d839d3
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|
188 |
oop prev_obj = CompressedOops::decode_not_null(prev); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
189 |
enqueue(prev_obj); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
190 |
} |
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|
191 |
} |
9c18c9d839d3
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|
192 |
|
9c18c9d839d3
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|
193 |
if (!CompressedOops::is_null(o)) { |
9c18c9d839d3
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|
194 |
oop obj = CompressedOops::decode_not_null(o); |
9c18c9d839d3
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|
195 |
|
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|
196 |
if (CHECKCAST) { |
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|
197 |
assert(bound != NULL, "need element klass for checkcast"); |
9c18c9d839d3
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|
198 |
if (!oopDesc::is_instanceof_or_null(obj, bound)) { |
9c18c9d839d3
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|
199 |
return false; |
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|
200 |
} |
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|
201 |
} |
9c18c9d839d3
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|
202 |
|
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|
203 |
switch (STOREVAL_MODE) { |
9c18c9d839d3
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|
204 |
case NONE: |
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|
205 |
break; |
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206 |
case READ_BARRIER: |
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obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); |
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break; |
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case WRITE_BARRIER: |
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if (_heap->in_collection_set(obj)) { |
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oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); |
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if (oopDesc::equals_raw(forw, obj)) { |
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forw = _heap->evacuate_object(forw, thread); |
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} |
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obj = forw; |
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} |
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enqueue(obj); |
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break; |
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219 |
default: |
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ShouldNotReachHere(); |
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221 |
} |
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222 |
|
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RawAccess<IS_NOT_NULL>::oop_store(cur_dst, obj); |
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} else { |
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// Store null. |
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RawAccess<>::oop_store(cur_dst, o); |
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227 |
} |
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return true; |
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229 |
} |
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230 |
|
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231 |
// Clone barrier support |
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template <DecoratorSet decorators, typename BarrierSetT> |
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void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t size) { |
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src = arrayOop(ShenandoahBarrierSet::barrier_set()->read_barrier(src)); |
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dst = arrayOop(ShenandoahBarrierSet::barrier_set()->write_barrier(dst)); |
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Raw::clone(src, dst, size); |
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ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) dst, size)); |
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238 |
} |
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239 |
|
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template <DecoratorSet decorators, typename BarrierSetT> |
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template <typename T> |
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bool ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, |
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arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, |
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size_t length) { |
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ShenandoahHeap* heap = ShenandoahHeap::heap(); |
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if (!CompressedOops::is_null(src_obj)) { |
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src_obj = arrayOop(ShenandoahBarrierSet::barrier_set()->read_barrier(src_obj)); |
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248 |
} |
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if (!CompressedOops::is_null(dst_obj)) { |
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dst_obj = arrayOop(ShenandoahBarrierSet::barrier_set()->write_barrier(dst_obj)); |
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251 |
} |
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252 |
|
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bool satb = ShenandoahSATBBarrier && heap->is_concurrent_mark_in_progress(); |
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bool checkcast = HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value; |
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bool disjoint = HasDecorator<decorators, ARRAYCOPY_DISJOINT>::value; |
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256 |
ArrayCopyStoreValMode storeval_mode; |
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if (heap->has_forwarded_objects()) { |
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if (heap->is_concurrent_traversal_in_progress()) { |
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storeval_mode = WRITE_BARRIER; |
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} else if (heap->is_concurrent_mark_in_progress() || heap->is_update_refs_in_progress()) { |
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storeval_mode = READ_BARRIER; |
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262 |
} else { |
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assert(heap->is_idle() || heap->is_evacuation_in_progress(), "must not have anything in progress"); |
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storeval_mode = NONE; // E.g. during evac or outside cycle |
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265 |
} |
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266 |
} else { |
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assert(heap->is_stable() || heap->is_concurrent_mark_in_progress(), "must not have anything in progress"); |
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storeval_mode = NONE; |
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269 |
} |
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270 |
|
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if (!satb && !checkcast && storeval_mode == NONE) { |
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// Short-circuit to bulk copy. |
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return Raw::oop_arraycopy(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length); |
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274 |
} |
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275 |
|
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src_raw = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw); |
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dst_raw = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw); |
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278 |
|
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Klass* bound = objArrayOop(dst_obj)->element_klass(); |
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ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); |
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281 |
return bs->arraycopy_loop_1(src_raw, dst_raw, length, bound, checkcast, satb, disjoint, storeval_mode); |
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282 |
} |
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283 |
|
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP |