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90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/*
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* Copyright (c) 2015, 2024, 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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#ifndef SHARE_GC_Z_ZMARK_INLINE_HPP
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#define SHARE_GC_Z_ZMARK_INLINE_HPP
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#include "gc/z/zMark.hpp"
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#include "gc/z/zAddress.inline.hpp"
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#include "gc/z/zGeneration.inline.hpp"
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#include "gc/z/zMarkStack.inline.hpp"
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#include "gc/z/zMarkTerminate.inline.hpp"
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#include "gc/z/zPage.inline.hpp"
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#include "gc/z/zPageTable.inline.hpp"
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#include "gc/z/zThreadLocalData.hpp"
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#include "runtime/javaThread.hpp"
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#include "utilities/debug.hpp"
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// Marking before pushing helps reduce mark stack memory usage. However,
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// we only mark before pushing in GC threads to avoid burdening Java threads
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// with writing to, and potentially first having to clear, mark bitmaps.
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//
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// It's also worth noting that while marking an object can be done at any
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// time in the marking phase, following an object can only be done after
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// root processing has called ClassLoaderDataGraph::clear_claimed_marks(),
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// since it otherwise would interact badly with claiming of CLDs.
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template <bool resurrect, bool gc_thread, bool follow, bool finalizable>
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inline void ZMark::mark_object(zaddress addr) {
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assert_is_oop(addr);
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ZPage* const page = _page_table->get(addr);
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if (page->is_allocating()) {
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// Already implicitly marked
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return;
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}
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const bool mark_before_push = gc_thread;
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bool inc_live = false;
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if (mark_before_push) {
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// Try mark object
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if (!page->mark_object(addr, finalizable, inc_live)) {
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// Already marked
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return;
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}
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} else {
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// Don't push if already marked
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if (page->is_object_marked(addr, finalizable)) {
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// Already marked
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return;
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}
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}
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if (resurrect) {
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_terminate.set_resurrected(true);
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}
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// Push
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ZMarkThreadLocalStacks* const stacks = ZThreadLocalData::mark_stacks(Thread::current(), _generation->id());
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ZMarkStripe* const stripe = _stripes.stripe_for_addr(untype(addr));
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ZMarkStackEntry entry(untype(ZAddress::offset(addr)), !mark_before_push, inc_live, follow, finalizable);
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assert(ZHeap::heap()->is_young(addr) == _generation->is_young(), "Phase/object mismatch");
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const bool publish = !gc_thread;
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stacks->push(&_allocator, &_stripes, stripe, &_terminate, entry, publish);
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}
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#endif // SHARE_GC_Z_ZMARK_INLINE_HPP
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