146 lines
5.1 KiB
C++
146 lines
5.1 KiB
C++
/*
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* Copyright (c) 2017, 2018, 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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*/
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#include "precompiled.hpp"
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#include "gc/g1/g1FullGCCompactionPoint.hpp"
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#include "gc/g1/heapRegion.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/debug.hpp"
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G1FullGCCompactionPoint::G1FullGCCompactionPoint() :
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_current_region(NULL),
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_threshold(NULL),
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_compaction_top(NULL) {
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_compaction_regions = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapRegion*>(32, mtGC);
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_compaction_region_iterator = _compaction_regions->begin();
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}
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G1FullGCCompactionPoint::~G1FullGCCompactionPoint() {
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delete _compaction_regions;
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}
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void G1FullGCCompactionPoint::update() {
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if (is_initialized()) {
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_current_region->set_compaction_top(_compaction_top);
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}
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}
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void G1FullGCCompactionPoint::initialize_values(bool init_threshold) {
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_compaction_top = _current_region->compaction_top();
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if (init_threshold) {
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_threshold = _current_region->initialize_threshold();
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}
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}
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bool G1FullGCCompactionPoint::has_regions() {
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return !_compaction_regions->is_empty();
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}
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bool G1FullGCCompactionPoint::is_initialized() {
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return _current_region != NULL;
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}
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void G1FullGCCompactionPoint::initialize(HeapRegion* hr, bool init_threshold) {
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_current_region = hr;
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initialize_values(init_threshold);
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}
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HeapRegion* G1FullGCCompactionPoint::current_region() {
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return *_compaction_region_iterator;
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}
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HeapRegion* G1FullGCCompactionPoint::next_region() {
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HeapRegion* next = *(++_compaction_region_iterator);
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assert(next != NULL, "Must return valid region");
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return next;
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}
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GrowableArray<HeapRegion*>* G1FullGCCompactionPoint::regions() {
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return _compaction_regions;
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}
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bool G1FullGCCompactionPoint::object_will_fit(size_t size) {
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size_t space_left = pointer_delta(_current_region->end(), _compaction_top);
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return size <= space_left;
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}
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void G1FullGCCompactionPoint::switch_region() {
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// Save compaction top in the region.
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_current_region->set_compaction_top(_compaction_top);
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// Get the next region and re-initialize the values.
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_current_region = next_region();
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initialize_values(true);
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}
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void G1FullGCCompactionPoint::forward(oop object, size_t size) {
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assert(_current_region != NULL, "Must have been initialized");
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// Ensure the object fit in the current region.
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while (!object_will_fit(size)) {
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switch_region();
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}
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// Store a forwarding pointer if the object should be moved.
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if (cast_from_oop<HeapWord*>(object) != _compaction_top) {
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object->forward_to(oop(_compaction_top));
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} else {
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if (object->forwardee() != NULL) {
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// Object should not move but mark-word is used so it looks like the
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// object is forwarded. Need to clear the mark and it's no problem
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// since it will be restored by preserved marks. There is an exception
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// with BiasedLocking, in this case forwardee() will return NULL
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// even if the mark-word is used. This is no problem since
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// forwardee() will return NULL in the compaction phase as well.
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object->init_mark_raw();
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} else {
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// Make sure object has the correct mark-word set or that it will be
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// fixed when restoring the preserved marks.
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assert(object->mark_raw() == markWord::prototype_for_klass(object->klass()) || // Correct mark
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object->mark_must_be_preserved() || // Will be restored by PreservedMarksSet
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(UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
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"should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
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p2i(object), object->mark_raw().value(), markWord::prototype_for_klass(object->klass()).value());
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}
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assert(object->forwardee() == NULL, "should be forwarded to NULL");
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}
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// Update compaction values.
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_compaction_top += size;
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if (_compaction_top > _threshold) {
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_threshold = _current_region->cross_threshold(_compaction_top - size, _compaction_top);
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}
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}
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void G1FullGCCompactionPoint::add(HeapRegion* hr) {
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_compaction_regions->append(hr);
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}
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void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
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_compaction_regions->appendAll(other->regions());
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}
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HeapRegion* G1FullGCCompactionPoint::remove_last() {
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return _compaction_regions->pop();
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}
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