author | rkennke |
Tue, 02 Apr 2019 18:13:42 +0200 | |
changeset 54383 | cdc3bb0983a6 |
parent 53850 | f42c58bab973 |
child 54536 | fb53a1c25903 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 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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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHHEAP_INLINE_HPP |
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#define SHARE_GC_SHENANDOAH_SHENANDOAHHEAP_INLINE_HPP |
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#include "classfile/javaClasses.inline.hpp" |
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#include "gc/shared/markBitMap.inline.hpp" |
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#include "gc/shared/threadLocalAllocBuffer.inline.hpp" |
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#include "gc/shared/suspendibleThreadSet.hpp" |
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#include "gc/shenandoah/shenandoahAsserts.hpp" |
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#include "gc/shenandoah/shenandoahBarrierSet.inline.hpp" |
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#include "gc/shenandoah/shenandoahBrooksPointer.inline.hpp" |
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#include "gc/shenandoah/shenandoahCollectionSet.inline.hpp" |
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#include "gc/shenandoah/shenandoahWorkGroup.hpp" |
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#include "gc/shenandoah/shenandoahHeap.hpp" |
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#include "gc/shenandoah/shenandoahHeapRegionSet.inline.hpp" |
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#include "gc/shenandoah/shenandoahHeapRegion.inline.hpp" |
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#include "gc/shenandoah/shenandoahControlThread.hpp" |
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#include "gc/shenandoah/shenandoahMarkingContext.inline.hpp" |
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#include "gc/shenandoah/shenandoahThreadLocalData.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/prefetch.inline.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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template <class T> |
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void ShenandoahUpdateRefsClosure::do_oop_work(T* p) { |
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T o = RawAccess<>::oop_load(p); |
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if (!CompressedOops::is_null(o)) { |
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oop obj = CompressedOops::decode_not_null(o); |
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_heap->update_with_forwarded_not_null(p, obj); |
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} |
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} |
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void ShenandoahUpdateRefsClosure::do_oop(oop* p) { do_oop_work(p); } |
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void ShenandoahUpdateRefsClosure::do_oop(narrowOop* p) { do_oop_work(p); } |
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inline ShenandoahHeapRegion* ShenandoahRegionIterator::next() { |
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size_t new_index = Atomic::add((size_t) 1, &_index); |
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// get_region() provides the bounds-check and returns NULL on OOB. |
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return _heap->get_region(new_index - 1); |
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} |
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inline bool ShenandoahHeap::has_forwarded_objects() const { |
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return _gc_state.is_set(HAS_FORWARDED); |
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} |
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inline WorkGang* ShenandoahHeap::workers() const { |
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return _workers; |
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} |
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inline WorkGang* ShenandoahHeap::get_safepoint_workers() { |
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return _safepoint_workers; |
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} |
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inline size_t ShenandoahHeap::heap_region_index_containing(const void* addr) const { |
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uintptr_t region_start = ((uintptr_t) addr); |
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uintptr_t index = (region_start - (uintptr_t) base()) >> ShenandoahHeapRegion::region_size_bytes_shift(); |
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assert(index < num_regions(), "Region index is in bounds: " PTR_FORMAT, p2i(addr)); |
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return index; |
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} |
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inline ShenandoahHeapRegion* const ShenandoahHeap::heap_region_containing(const void* addr) const { |
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size_t index = heap_region_index_containing(addr); |
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ShenandoahHeapRegion* const result = get_region(index); |
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assert(addr >= result->bottom() && addr < result->end(), "Heap region contains the address: " PTR_FORMAT, p2i(addr)); |
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return result; |
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} |
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template <class T> |
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inline oop ShenandoahHeap::update_with_forwarded_not_null(T* p, oop obj) { |
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if (in_collection_set(obj)) { |
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shenandoah_assert_forwarded_except(p, obj, is_full_gc_in_progress() || cancelled_gc() || is_degenerated_gc_in_progress()); |
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obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); |
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RawAccess<IS_NOT_NULL>::oop_store(p, obj); |
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} |
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#ifdef ASSERT |
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else { |
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102 |
shenandoah_assert_not_forwarded(p, obj); |
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103 |
} |
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104 |
#endif |
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105 |
return obj; |
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106 |
} |
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107 |
|
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108 |
template <class T> |
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109 |
inline oop ShenandoahHeap::maybe_update_with_forwarded(T* p) { |
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110 |
T o = RawAccess<>::oop_load(p); |
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111 |
if (!CompressedOops::is_null(o)) { |
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112 |
oop obj = CompressedOops::decode_not_null(o); |
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113 |
return maybe_update_with_forwarded_not_null(p, obj); |
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114 |
} else { |
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115 |
return NULL; |
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116 |
} |
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117 |
} |
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118 |
|
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119 |
template <class T> |
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120 |
inline oop ShenandoahHeap::evac_update_with_forwarded(T* p) { |
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121 |
T o = RawAccess<>::oop_load(p); |
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122 |
if (!CompressedOops::is_null(o)) { |
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123 |
oop heap_oop = CompressedOops::decode_not_null(o); |
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124 |
if (in_collection_set(heap_oop)) { |
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125 |
oop forwarded_oop = ShenandoahBarrierSet::resolve_forwarded_not_null(heap_oop); |
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126 |
if (oopDesc::equals_raw(forwarded_oop, heap_oop)) { |
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127 |
forwarded_oop = evacuate_object(heap_oop, Thread::current()); |
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128 |
} |
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129 |
oop prev = atomic_compare_exchange_oop(forwarded_oop, p, heap_oop); |
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130 |
if (oopDesc::equals_raw(prev, heap_oop)) { |
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131 |
return forwarded_oop; |
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132 |
} else { |
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133 |
return NULL; |
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134 |
} |
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135 |
} |
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136 |
return heap_oop; |
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137 |
} else { |
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138 |
return NULL; |
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139 |
} |
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140 |
} |
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141 |
|
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142 |
inline oop ShenandoahHeap::atomic_compare_exchange_oop(oop n, oop* addr, oop c) { |
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143 |
return (oop) Atomic::cmpxchg(n, addr, c); |
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144 |
} |
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145 |
|
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146 |
inline oop ShenandoahHeap::atomic_compare_exchange_oop(oop n, narrowOop* addr, oop c) { |
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147 |
narrowOop cmp = CompressedOops::encode(c); |
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148 |
narrowOop val = CompressedOops::encode(n); |
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149 |
return CompressedOops::decode((narrowOop) Atomic::cmpxchg(val, addr, cmp)); |
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150 |
} |
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151 |
|
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152 |
template <class T> |
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153 |
inline oop ShenandoahHeap::maybe_update_with_forwarded_not_null(T* p, oop heap_oop) { |
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154 |
shenandoah_assert_not_in_cset_loc_except(p, !is_in(p) || is_full_gc_in_progress() || is_degenerated_gc_in_progress()); |
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155 |
shenandoah_assert_correct(p, heap_oop); |
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|
156 |
|
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157 |
if (in_collection_set(heap_oop)) { |
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|
158 |
oop forwarded_oop = ShenandoahBarrierSet::resolve_forwarded_not_null(heap_oop); |
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|
159 |
if (oopDesc::equals_raw(forwarded_oop, heap_oop)) { |
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160 |
// E.g. during evacuation. |
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161 |
return forwarded_oop; |
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|
162 |
} |
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|
163 |
|
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|
164 |
shenandoah_assert_forwarded_except(p, heap_oop, is_full_gc_in_progress() || is_degenerated_gc_in_progress()); |
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|
165 |
shenandoah_assert_not_in_cset_except(p, forwarded_oop, cancelled_gc()); |
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|
166 |
|
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|
167 |
// If this fails, another thread wrote to p before us, it will be logged in SATB and the |
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168 |
// reference be updated later. |
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|
169 |
oop result = atomic_compare_exchange_oop(forwarded_oop, p, heap_oop); |
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|
170 |
|
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|
171 |
if (oopDesc::equals_raw(result, heap_oop)) { // CAS successful. |
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172 |
return forwarded_oop; |
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|
173 |
} else { |
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|
174 |
// Note: we used to assert the following here. This doesn't work because sometimes, during |
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|
175 |
// marking/updating-refs, it can happen that a Java thread beats us with an arraycopy, |
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176 |
// which first copies the array, which potentially contains from-space refs, and only afterwards |
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177 |
// updates all from-space refs to to-space refs, which leaves a short window where the new array |
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178 |
// elements can be from-space. |
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179 |
// assert(CompressedOops::is_null(result) || |
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180 |
// oopDesc::equals_raw(result, ShenandoahBarrierSet::resolve_oop_static_not_null(result)), |
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|
181 |
// "expect not forwarded"); |
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182 |
return NULL; |
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|
183 |
} |
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|
184 |
} else { |
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|
185 |
shenandoah_assert_not_forwarded(p, heap_oop); |
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|
186 |
return heap_oop; |
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|
187 |
} |
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|
188 |
} |
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|
189 |
|
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190 |
inline bool ShenandoahHeap::cancelled_gc() const { |
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191 |
return _cancelled_gc.get() == CANCELLED; |
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192 |
} |
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|
193 |
|
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194 |
inline bool ShenandoahHeap::check_cancelled_gc_and_yield(bool sts_active) { |
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195 |
if (! (sts_active && ShenandoahSuspendibleWorkers)) { |
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196 |
return cancelled_gc(); |
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197 |
} |
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|
198 |
|
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199 |
jbyte prev = _cancelled_gc.cmpxchg(NOT_CANCELLED, CANCELLABLE); |
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200 |
if (prev == CANCELLABLE || prev == NOT_CANCELLED) { |
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201 |
if (SuspendibleThreadSet::should_yield()) { |
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202 |
SuspendibleThreadSet::yield(); |
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203 |
} |
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204 |
|
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205 |
// Back to CANCELLABLE. The thread that poked NOT_CANCELLED first gets |
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// to restore to CANCELLABLE. |
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if (prev == CANCELLABLE) { |
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_cancelled_gc.set(CANCELLABLE); |
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} |
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return false; |
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211 |
} else { |
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return true; |
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} |
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} |
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215 |
|
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inline void ShenandoahHeap::clear_cancelled_gc() { |
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_cancelled_gc.set(CANCELLABLE); |
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_oom_evac_handler.clear(); |
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} |
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220 |
|
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inline HeapWord* ShenandoahHeap::allocate_from_gclab(Thread* thread, size_t size) { |
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assert(UseTLAB, "TLABs should be enabled"); |
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223 |
|
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PLAB* gclab = ShenandoahThreadLocalData::gclab(thread); |
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if (gclab == NULL) { |
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assert(!thread->is_Java_thread() && !thread->is_Worker_thread(), |
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"Performance: thread should have GCLAB: %s", thread->name()); |
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// No GCLABs in this thread, fallback to shared allocation |
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return NULL; |
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230 |
} |
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HeapWord* obj = gclab->allocate(size); |
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if (obj != NULL) { |
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return obj; |
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234 |
} |
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// Otherwise... |
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return allocate_from_gclab_slow(thread, size); |
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237 |
} |
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238 |
|
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inline oop ShenandoahHeap::evacuate_object(oop p, Thread* thread) { |
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if (ShenandoahThreadLocalData::is_oom_during_evac(Thread::current())) { |
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// This thread went through the OOM during evac protocol and it is safe to return |
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// the forward pointer. It must not attempt to evacuate any more. |
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return ShenandoahBarrierSet::resolve_forwarded(p); |
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} |
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245 |
|
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assert(ShenandoahThreadLocalData::is_evac_allowed(thread), "must be enclosed in oom-evac scope"); |
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247 |
|
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size_t size_no_fwdptr = (size_t) p->size(); |
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size_t size_with_fwdptr = size_no_fwdptr + ShenandoahBrooksPointer::word_size(); |
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250 |
|
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assert(!heap_region_containing(p)->is_humongous(), "never evacuate humongous objects"); |
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252 |
|
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bool alloc_from_gclab = true; |
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HeapWord* filler = NULL; |
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255 |
|
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256 |
#ifdef ASSERT |
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257 |
if (ShenandoahOOMDuringEvacALot && |
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(os::random() & 1) == 0) { // Simulate OOM every ~2nd slow-path call |
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filler = NULL; |
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} else { |
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261 |
#endif |
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262 |
if (UseTLAB) { |
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filler = allocate_from_gclab(thread, size_with_fwdptr); |
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264 |
} |
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265 |
if (filler == NULL) { |
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ShenandoahAllocRequest req = ShenandoahAllocRequest::for_shared_gc(size_with_fwdptr); |
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filler = allocate_memory(req); |
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alloc_from_gclab = false; |
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269 |
} |
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270 |
#ifdef ASSERT |
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271 |
} |
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272 |
#endif |
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273 |
|
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274 |
if (filler == NULL) { |
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275 |
control_thread()->handle_alloc_failure_evac(size_with_fwdptr); |
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276 |
|
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277 |
_oom_evac_handler.handle_out_of_memory_during_evacuation(); |
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278 |
|
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279 |
return ShenandoahBarrierSet::resolve_forwarded(p); |
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280 |
} |
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281 |
|
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282 |
// Copy the object and initialize its forwarding ptr: |
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283 |
HeapWord* copy = filler + ShenandoahBrooksPointer::word_size(); |
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284 |
oop copy_val = oop(copy); |
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285 |
|
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286 |
Copy::aligned_disjoint_words((HeapWord*) p, copy, size_no_fwdptr); |
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287 |
ShenandoahBrooksPointer::initialize(oop(copy)); |
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288 |
|
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289 |
// Try to install the new forwarding pointer. |
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290 |
oop result = ShenandoahBrooksPointer::try_update_forwardee(p, copy_val); |
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291 |
|
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292 |
if (oopDesc::equals_raw(result, p)) { |
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293 |
// Successfully evacuated. Our copy is now the public one! |
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294 |
shenandoah_assert_correct(NULL, copy_val); |
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295 |
return copy_val; |
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296 |
} else { |
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297 |
// Failed to evacuate. We need to deal with the object that is left behind. Since this |
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298 |
// new allocation is certainly after TAMS, it will be considered live in the next cycle. |
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299 |
// But if it happens to contain references to evacuated regions, those references would |
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300 |
// not get updated for this stale copy during this cycle, and we will crash while scanning |
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301 |
// it the next cycle. |
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302 |
// |
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303 |
// For GCLAB allocations, it is enough to rollback the allocation ptr. Either the next |
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304 |
// object will overwrite this stale copy, or the filler object on LAB retirement will |
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305 |
// do this. For non-GCLAB allocations, we have no way to retract the allocation, and |
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306 |
// have to explicitly overwrite the copy with the filler object. With that overwrite, |
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307 |
// we have to keep the fwdptr initialized and pointing to our (stale) copy. |
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308 |
if (alloc_from_gclab) { |
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309 |
ShenandoahThreadLocalData::gclab(thread)->undo_allocation(filler, size_with_fwdptr); |
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} else { |
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311 |
fill_with_object(copy, size_no_fwdptr); |
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312 |
} |
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313 |
shenandoah_assert_correct(NULL, copy_val); |
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314 |
shenandoah_assert_correct(NULL, result); |
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return result; |
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316 |
} |
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317 |
} |
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318 |
|
53850 | 319 |
template<bool RESOLVE> |
52925
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320 |
inline bool ShenandoahHeap::requires_marking(const void* entry) const { |
53850 | 321 |
oop obj = oop(entry); |
322 |
if (RESOLVE) { |
|
323 |
obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); |
|
324 |
} |
|
325 |
return !_marking_context->is_marked(obj); |
|
52925
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326 |
} |
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327 |
|
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328 |
template <class T> |
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329 |
inline bool ShenandoahHeap::in_collection_set(T p) const { |
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330 |
HeapWord* obj = (HeapWord*) p; |
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331 |
assert(collection_set() != NULL, "Sanity"); |
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332 |
assert(is_in(obj), "should be in heap"); |
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|
333 |
|
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334 |
return collection_set()->is_in(obj); |
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335 |
} |
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|
336 |
|
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337 |
inline bool ShenandoahHeap::is_stable() const { |
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338 |
return _gc_state.is_clear(); |
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339 |
} |
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|
340 |
|
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|
341 |
inline bool ShenandoahHeap::is_idle() const { |
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342 |
return _gc_state.is_unset(MARKING | EVACUATION | UPDATEREFS | TRAVERSAL); |
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343 |
} |
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|
344 |
|
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345 |
inline bool ShenandoahHeap::is_concurrent_mark_in_progress() const { |
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346 |
return _gc_state.is_set(MARKING); |
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347 |
} |
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|
348 |
|
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|
349 |
inline bool ShenandoahHeap::is_concurrent_traversal_in_progress() const { |
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350 |
return _gc_state.is_set(TRAVERSAL); |
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|
351 |
} |
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|
352 |
|
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|
353 |
inline bool ShenandoahHeap::is_evacuation_in_progress() const { |
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354 |
return _gc_state.is_set(EVACUATION); |
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355 |
} |
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|
356 |
|
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|
357 |
inline bool ShenandoahHeap::is_gc_in_progress_mask(uint mask) const { |
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358 |
return _gc_state.is_set(mask); |
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|
359 |
} |
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|
360 |
|
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|
361 |
inline bool ShenandoahHeap::is_degenerated_gc_in_progress() const { |
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|
362 |
return _degenerated_gc_in_progress.is_set(); |
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|
363 |
} |
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|
364 |
|
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|
365 |
inline bool ShenandoahHeap::is_full_gc_in_progress() const { |
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366 |
return _full_gc_in_progress.is_set(); |
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367 |
} |
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|
368 |
|
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|
369 |
inline bool ShenandoahHeap::is_full_gc_move_in_progress() const { |
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370 |
return _full_gc_move_in_progress.is_set(); |
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|
371 |
} |
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|
372 |
|
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|
373 |
inline bool ShenandoahHeap::is_update_refs_in_progress() const { |
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374 |
return _gc_state.is_set(UPDATEREFS); |
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|
375 |
} |
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|
376 |
|
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|
377 |
template<class T> |
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|
378 |
inline void ShenandoahHeap::marked_object_iterate(ShenandoahHeapRegion* region, T* cl) { |
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|
379 |
marked_object_iterate(region, cl, region->top()); |
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|
380 |
} |
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|
381 |
|
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|
382 |
template<class T> |
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|
383 |
inline void ShenandoahHeap::marked_object_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit) { |
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|
384 |
assert(ShenandoahBrooksPointer::word_offset() < 0, "skip_delta calculation below assumes the forwarding ptr is before obj"); |
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|
385 |
assert(! region->is_humongous_continuation(), "no humongous continuation regions here"); |
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|
386 |
|
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|
387 |
ShenandoahMarkingContext* const ctx = complete_marking_context(); |
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|
388 |
assert(ctx->is_complete(), "sanity"); |
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|
389 |
|
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|
390 |
MarkBitMap* mark_bit_map = ctx->mark_bit_map(); |
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|
391 |
HeapWord* tams = ctx->top_at_mark_start(region); |
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|
392 |
|
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|
393 |
size_t skip_bitmap_delta = ShenandoahBrooksPointer::word_size() + 1; |
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|
394 |
size_t skip_objsize_delta = ShenandoahBrooksPointer::word_size() /* + actual obj.size() below */; |
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|
395 |
HeapWord* start = region->bottom() + ShenandoahBrooksPointer::word_size(); |
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|
396 |
HeapWord* end = MIN2(tams + ShenandoahBrooksPointer::word_size(), region->end()); |
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|
397 |
|
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|
398 |
// Step 1. Scan below the TAMS based on bitmap data. |
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|
399 |
HeapWord* limit_bitmap = MIN2(limit, tams); |
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|
400 |
|
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|
401 |
// Try to scan the initial candidate. If the candidate is above the TAMS, it would |
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|
402 |
// fail the subsequent "< limit_bitmap" checks, and fall through to Step 2. |
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|
403 |
HeapWord* cb = mark_bit_map->get_next_marked_addr(start, end); |
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|
404 |
|
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|
405 |
intx dist = ShenandoahMarkScanPrefetch; |
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|
406 |
if (dist > 0) { |
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|
407 |
// Batched scan that prefetches the oop data, anticipating the access to |
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|
408 |
// either header, oop field, or forwarding pointer. Not that we cannot |
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|
409 |
// touch anything in oop, while it still being prefetched to get enough |
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|
410 |
// time for prefetch to work. This is why we try to scan the bitmap linearly, |
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|
411 |
// disregarding the object size. However, since we know forwarding pointer |
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|
412 |
// preceeds the object, we can skip over it. Once we cannot trust the bitmap, |
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|
413 |
// there is no point for prefetching the oop contents, as oop->size() will |
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|
414 |
// touch it prematurely. |
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|
415 |
|
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|
416 |
// No variable-length arrays in standard C++, have enough slots to fit |
9c18c9d839d3
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|
417 |
// the prefetch distance. |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
418 |
static const int SLOT_COUNT = 256; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
419 |
guarantee(dist <= SLOT_COUNT, "adjust slot count"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
420 |
HeapWord* slots[SLOT_COUNT]; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
421 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
422 |
int avail; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
423 |
do { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
424 |
avail = 0; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
425 |
for (int c = 0; (c < dist) && (cb < limit_bitmap); c++) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
426 |
Prefetch::read(cb, ShenandoahBrooksPointer::byte_offset()); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
427 |
slots[avail++] = cb; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
428 |
cb += skip_bitmap_delta; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
429 |
if (cb < limit_bitmap) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
430 |
cb = mark_bit_map->get_next_marked_addr(cb, limit_bitmap); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
431 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
432 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
433 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
434 |
for (int c = 0; c < avail; c++) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
435 |
assert (slots[c] < tams, "only objects below TAMS here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(slots[c]), p2i(tams)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
436 |
assert (slots[c] < limit, "only objects below limit here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(slots[c]), p2i(limit)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
437 |
oop obj = oop(slots[c]); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
438 |
assert(oopDesc::is_oop(obj), "sanity"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
439 |
assert(ctx->is_marked(obj), "object expected to be marked"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
440 |
cl->do_object(obj); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
441 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
442 |
} while (avail > 0); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
443 |
} else { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
444 |
while (cb < limit_bitmap) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
445 |
assert (cb < tams, "only objects below TAMS here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(cb), p2i(tams)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
446 |
assert (cb < limit, "only objects below limit here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(cb), p2i(limit)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
447 |
oop obj = oop(cb); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
448 |
assert(oopDesc::is_oop(obj), "sanity"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
449 |
assert(ctx->is_marked(obj), "object expected to be marked"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
450 |
cl->do_object(obj); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
451 |
cb += skip_bitmap_delta; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
452 |
if (cb < limit_bitmap) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
453 |
cb = mark_bit_map->get_next_marked_addr(cb, limit_bitmap); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
454 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
455 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
456 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
457 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
458 |
// Step 2. Accurate size-based traversal, happens past the TAMS. |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
459 |
// This restarts the scan at TAMS, which makes sure we traverse all objects, |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
460 |
// regardless of what happened at Step 1. |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
461 |
HeapWord* cs = tams + ShenandoahBrooksPointer::word_size(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
462 |
while (cs < limit) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
463 |
assert (cs > tams, "only objects past TAMS here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(cs), p2i(tams)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
464 |
assert (cs < limit, "only objects below limit here: " PTR_FORMAT " (" PTR_FORMAT ")", p2i(cs), p2i(limit)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
465 |
oop obj = oop(cs); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
466 |
assert(oopDesc::is_oop(obj), "sanity"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
467 |
assert(ctx->is_marked(obj), "object expected to be marked"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
468 |
int size = obj->size(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
469 |
cl->do_object(obj); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
470 |
cs += size + skip_objsize_delta; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
471 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
472 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
473 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
474 |
template <class T> |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
475 |
class ShenandoahObjectToOopClosure : public ObjectClosure { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
476 |
T* _cl; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
477 |
public: |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
478 |
ShenandoahObjectToOopClosure(T* cl) : _cl(cl) {} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
479 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
480 |
void do_object(oop obj) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
481 |
obj->oop_iterate(_cl); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
482 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
483 |
}; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
484 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
485 |
template <class T> |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
486 |
class ShenandoahObjectToOopBoundedClosure : public ObjectClosure { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
487 |
T* _cl; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
488 |
MemRegion _bounds; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
489 |
public: |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
490 |
ShenandoahObjectToOopBoundedClosure(T* cl, HeapWord* bottom, HeapWord* top) : |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
491 |
_cl(cl), _bounds(bottom, top) {} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
492 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
493 |
void do_object(oop obj) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
494 |
obj->oop_iterate(_cl, _bounds); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
495 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
496 |
}; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
497 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
498 |
template<class T> |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
499 |
inline void ShenandoahHeap::marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* top) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
500 |
if (region->is_humongous()) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
501 |
HeapWord* bottom = region->bottom(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
502 |
if (top > bottom) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
503 |
region = region->humongous_start_region(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
504 |
ShenandoahObjectToOopBoundedClosure<T> objs(cl, bottom, top); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
505 |
marked_object_iterate(region, &objs); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
506 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
507 |
} else { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
508 |
ShenandoahObjectToOopClosure<T> objs(cl); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
509 |
marked_object_iterate(region, &objs, top); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
510 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
511 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
512 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
513 |
inline ShenandoahHeapRegion* const ShenandoahHeap::get_region(size_t region_idx) const { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
514 |
if (region_idx < _num_regions) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
515 |
return _regions[region_idx]; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
516 |
} else { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
517 |
return NULL; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
518 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
519 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
520 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
521 |
inline void ShenandoahHeap::mark_complete_marking_context() { |
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_marking_context->mark_complete(); |
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} |
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inline void ShenandoahHeap::mark_incomplete_marking_context() { |
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_marking_context->mark_incomplete(); |
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} |
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inline ShenandoahMarkingContext* ShenandoahHeap::complete_marking_context() const { |
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assert (_marking_context->is_complete()," sanity"); |
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return _marking_context; |
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} |
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inline ShenandoahMarkingContext* ShenandoahHeap::marking_context() const { |
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return _marking_context; |
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} |
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAP_INLINE_HPP |