author | pliden |
Wed, 13 Mar 2019 11:31:00 +0100 | |
changeset 54094 | ed3c6f07faab |
parent 52617 | b55c5c0ee24f |
child 54095 | 8b4a1177202d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2019, 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 "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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public: |
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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 ZRootsIteratorClosure { |
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private: |
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ZHeapIterator* const _iter; |
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public: |
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ZHeapIteratorRootOopClosure(ZHeapIterator* iter) : |
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_iter(iter) {} |
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virtual void do_oop(oop* p) { |
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// Load barrier needed here, even on non-concurrent strong roots, |
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// for the same reason we need fixup_partial_loads() in ZHeap::mark_end(). |
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const oop obj = NativeAccess<AS_NO_KEEPALIVE>::oop_load(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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}; |
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class ZHeapIteratorOopClosure : public BasicOopIterateClosure { |
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private: |
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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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oop load_oop(oop* p) const { |
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if (_visit_referents) { |
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return HeapAccess<ON_UNKNOWN_OOP_REF | AS_NO_KEEPALIVE>::oop_load_at(_base, _base->field_offset(p)); |
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} else { |
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return HeapAccess<AS_NO_KEEPALIVE>::oop_load(p); |
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} |
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} |
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public: |
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ZHeapIteratorOopClosure(ZHeapIterator* iter, oop base, bool visit_referents) : |
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_iter(iter), |
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_base(base), |
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_visit_referents(visit_referents) {} |
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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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static size_t object_index_max() { |
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return ZGranuleSize >> ZObjectAlignmentSmallShift; |
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} |
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static size_t object_index(oop obj) { |
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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 = ZGranuleSize - 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::objects_do(ObjectClosure* cl) { |
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// Note that the heap iterator visits all reachable objects, including |
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// objects that might be unreachable from the application, such as a |
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// not yet cleared JNIWeakGloablRef. However, also note that visiting |
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// the JVMTI tag map is a requirement to make sure we visit all tagged |
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// objects, even those that might now have become phantom reachable. |
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// If we didn't do this the application would have expected to see |
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// ObjectFree events for phantom reachable objects in the tag map. |
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ZHeapIteratorRootOopClosure root_cl(this); |
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// Push strong roots onto stack |
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{ |
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ZRootsIterator roots; |
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roots.oops_do(&root_cl); |
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} |
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{ |
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ZConcurrentRootsIterator roots; |
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roots.oops_do(&root_cl); |
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} |
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// Push weak roots onto stack |
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{ |
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ZWeakRootsIterator roots; |
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roots.oops_do(&root_cl); |
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} |
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{ |
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ZConcurrentWeakRootsIterator roots; |
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roots.oops_do(&root_cl); |
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} |
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// Drain stack |
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while (!_visit_stack.is_empty()) { |
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const oop obj = _visit_stack.pop(); |
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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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ZHeapIteratorOopClosure push_cl(this, obj, _visit_referents); |
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obj->oop_iterate(&push_cl); |
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} |
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} |