--- /dev/null 2017-02-09 18:28:35.238523416 +0100 +++ new/src/share/vm/gc/epsilon/epsilonBarrierSet.hpp 2017-02-12 23:18:05.293415299 +0100 @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef HOTSPOT_EPSILONBARRIERSET_HPP_H +#define HOTSPOT_EPSILONBARRIERSET_HPP_H + +#include "gc/shared/collectorPolicy.hpp" +#include "gc/shared/barrierSet.hpp" + +class EpsilonBarrierSet: public ModRefBarrierSet { + friend class VMStructs; + +public: + EpsilonBarrierSet() : + ModRefBarrierSet(BarrierSet::FakeRtti(BarrierSet::Epsilon)) {}; + + virtual bool has_write_ref_pre_barrier() { + return false; + } + + virtual bool has_write_ref_array_opt() { + return true; // TODO: why? + } + + virtual bool has_write_region_opt() { + return true; // TODO: why? + } + + virtual void resize_covered_region(MemRegion new_region) { + + } + + virtual bool is_aligned(HeapWord *addr) { + return true; + } + + virtual void print_on(outputStream *st) const { + // do nothing + } + +protected: + virtual void write_ref_field_work(void *field, oop new_val, bool release) { + // do nothing + } + + virtual void write_ref_array_work(MemRegion mr) { + // do nothing + } + + virtual void write_region_work(MemRegion mr) { + // do nothing + } + +public: + virtual void invalidate(MemRegion mr) { + + } + + virtual void clear(MemRegion mr) { + + } +}; + +template<> +struct BarrierSet::GetName { + static const BarrierSet::Name value = BarrierSet::Epsilon; +}; + +#endif \ No newline at end of file