1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,81 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP
1.30 +
1.31 +#include "gc_implementation/shared/mutableSpace.hpp"
1.32 +
1.33 +//
1.34 +// A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
1.35 +// to a MutableSpace.
1.36 +//
1.37 +
1.38 +class ObjectStartArray;
1.39 +
1.40 +class PSMarkSweepDecorator: public CHeapObj<mtGC> {
1.41 + private:
1.42 + static PSMarkSweepDecorator* _destination_decorator;
1.43 +
1.44 + protected:
1.45 + MutableSpace* _space;
1.46 + ObjectStartArray* _start_array;
1.47 + HeapWord* _first_dead;
1.48 + HeapWord* _end_of_live;
1.49 + HeapWord* _compaction_top;
1.50 + size_t _allowed_dead_ratio;
1.51 +
1.52 + bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q,
1.53 + size_t word_len);
1.54 +
1.55 + public:
1.56 + PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
1.57 + size_t allowed_dead_ratio) :
1.58 + _space(space), _start_array(start_array),
1.59 + _allowed_dead_ratio(allowed_dead_ratio) { }
1.60 +
1.61 + // During a compacting collection, we need to collapse objects into
1.62 + // spaces in a given order. We want to fill space A, space B, and so
1.63 + // on. The code that controls that order is in the following methods.
1.64 + static void set_destination_decorator_tenured();
1.65 + static void advance_destination_decorator();
1.66 + static PSMarkSweepDecorator* destination_decorator();
1.67 +
1.68 + // Accessors
1.69 + MutableSpace* space() { return _space; }
1.70 + ObjectStartArray* start_array() { return _start_array; }
1.71 +
1.72 + HeapWord* compaction_top() { return _compaction_top; }
1.73 + void set_compaction_top(HeapWord* value) { _compaction_top = value; }
1.74 +
1.75 + size_t allowed_dead_ratio() { return _allowed_dead_ratio; }
1.76 + void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; }
1.77 +
1.78 + // Work methods
1.79 + void adjust_pointers();
1.80 + void precompact();
1.81 + void compact(bool mangle_free_space);
1.82 +};
1.83 +
1.84 +#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP
