author | stefank |
Wed, 27 Jun 2018 15:04:27 +0200 | |
changeset 50871 | d283a214f42b |
parent 50752 | 9d62da00bf15 |
child 50875 | 2217b2fc29ea |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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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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#include "precompiled.hpp" |
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#include "gc/z/zAddressRangeMap.inline.hpp" |
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#include "gc/z/zBarrier.inline.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zHeapIterator.hpp" |
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#include "gc/z/zOop.inline.hpp" |
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#include "gc/z/zRootsIterator.hpp" |
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#include "memory/iterator.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "utilities/bitMap.inline.hpp" |
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#include "utilities/stack.inline.hpp" |
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class ZHeapIteratorBitMap : public CHeapObj<mtGC> { |
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private: |
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CHeapBitMap _map; |
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ZHeapIteratorBitMap(size_t size_in_bits) : |
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_map(size_in_bits) {} |
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bool try_set_bit(size_t index) { |
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if (_map.at(index)) { |
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return false; |
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} |
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_map.set_bit(index); |
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return true; |
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} |
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}; |
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class ZHeapIteratorRootOopClosure : public OopClosure { |
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ZHeapIterator* const _iter; |
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ObjectClosure* const _cl; |
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ZHeapIteratorRootOopClosure(ZHeapIterator* iter, ObjectClosure* cl) : |
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_iter(iter), |
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_cl(cl) {} |
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virtual void do_oop(oop* p) { |
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// Load barrier needed here for the same reason we |
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// need fixup_partial_loads() in ZHeap::mark_end() |
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const oop obj = ZBarrier::load_barrier_on_oop_field(p); |
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_iter->push(obj); |
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_iter->drain(_cl); |
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} |
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virtual void do_oop(narrowOop* p) { |
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ShouldNotReachHere(); |
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} |
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}; |
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class ZHeapIteratorPushOopClosure : public BasicOopIterateClosure { |
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ZHeapIterator* const _iter; |
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const oop _base; |
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const bool _visit_referents; |
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ZHeapIteratorPushOopClosure(ZHeapIterator* iter, oop base) : |
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_iter(iter), |
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_base(base), |
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_visit_referents(iter->visit_referents()) {} |
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oop load_oop(oop* p) { |
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if (_visit_referents) { |
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return HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(_base, _base->field_offset(p)); |
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} else { |
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return HeapAccess<>::oop_load(p); |
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} |
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} |
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virtual ReferenceIterationMode reference_iteration_mode() { |
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return _visit_referents ? DO_FIELDS : DO_FIELDS_EXCEPT_REFERENT; |
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} |
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virtual void do_oop(oop* p) { |
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const oop obj = load_oop(p); |
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_iter->push(obj); |
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} |
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virtual void do_oop(narrowOop* p) { |
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ShouldNotReachHere(); |
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} |
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#ifdef ASSERT |
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virtual bool should_verify_oops() { |
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return false; |
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} |
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#endif |
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}; |
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ZHeapIterator::ZHeapIterator(bool visit_referents) : |
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_visit_stack(), |
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_visit_map(), |
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_visit_referents(visit_referents) {} |
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ZHeapIterator::~ZHeapIterator() { |
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ZVisitMapIterator iter(&_visit_map); |
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for (ZHeapIteratorBitMap* map; iter.next(&map);) { |
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delete map; |
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} |
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} |
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size_t ZHeapIterator::object_index_max() const { |
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return ZPageSizeMin >> ZObjectAlignmentSmallShift; |
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} |
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|
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size_t ZHeapIterator::object_index(oop obj) const { |
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const uintptr_t addr = ZOop::to_address(obj); |
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const uintptr_t offset = ZAddress::offset(addr); |
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const uintptr_t mask = (1 << ZPageSizeMinShift) - 1; |
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return (offset & mask) >> ZObjectAlignmentSmallShift; |
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} |
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ZHeapIteratorBitMap* ZHeapIterator::object_map(oop obj) { |
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const uintptr_t addr = ZOop::to_address(obj); |
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ZHeapIteratorBitMap* map = _visit_map.get(addr); |
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if (map == NULL) { |
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map = new ZHeapIteratorBitMap(object_index_max()); |
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_visit_map.put(addr, map); |
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} |
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return map; |
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} |
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void ZHeapIterator::push(oop obj) { |
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if (obj == NULL) { |
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// Ignore |
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return; |
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} |
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ZHeapIteratorBitMap* const map = object_map(obj); |
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const size_t index = object_index(obj); |
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if (!map->try_set_bit(index)) { |
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// Already pushed |
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return; |
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} |
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// Push |
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_visit_stack.push(obj); |
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} |
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void ZHeapIterator::drain(ObjectClosure* cl) { |
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while (!_visit_stack.is_empty()) { |
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const oop obj = _visit_stack.pop(); |
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|
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// Visit |
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cl->do_object(obj); |
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// Push members to visit |
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ZHeapIteratorPushOopClosure push_cl(this, obj); |
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obj->oop_iterate(&push_cl); |
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} |
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} |
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bool ZHeapIterator::visit_referents() const { |
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return _visit_referents; |
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} |
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void ZHeapIterator::objects_do(ObjectClosure* cl) { |
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ZHeapIteratorRootOopClosure root_cl(this, cl); |
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ZRootsIterator roots; |
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// Follow roots. Note that we also visit the JVMTI weak tag map |
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// as if they where strong roots to make sure we visit all tagged |
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// objects, even those that might now have become unreachable. |
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// If we didn't do this the user would have expected to see |
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// ObjectFree events for unreachable objects in the tag map. |
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roots.oops_do(&root_cl, true /* visit_jvmti_weak_export */); |
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} |