Mercurial > hg > truffle
view src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp @ 952:ace8397c8563
6876276: assert(!is_visited,"visit only once")
Summary: schedule the superword loads based on dependence constraints
Reviewed-by: kvn, never
author | cfang |
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date | Mon, 31 Aug 2009 08:31:45 -0700 |
parents | ad8c8ca4ab0f |
children | c18cbe5936b8 |
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/* * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations // to a MutableSpace. // class ObjectStartArray; class PSMarkSweepDecorator: public CHeapObj { private: static PSMarkSweepDecorator* _destination_decorator; protected: MutableSpace* _space; ObjectStartArray* _start_array; HeapWord* _first_dead; HeapWord* _end_of_live; HeapWord* _compaction_top; size_t _allowed_dead_ratio; bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, size_t word_len); public: PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array, size_t allowed_dead_ratio) : _space(space), _start_array(start_array), _allowed_dead_ratio(allowed_dead_ratio) { } // During a compacting collection, we need to collapse objects into // spaces in a given order. We want to fill space A, space B, and so // on. The code that controls that order is in the following methods. static void set_destination_decorator_tenured(); static void set_destination_decorator_perm_gen(); static void advance_destination_decorator(); static PSMarkSweepDecorator* destination_decorator(); // Accessors MutableSpace* space() { return _space; } ObjectStartArray* start_array() { return _start_array; } HeapWord* compaction_top() { return _compaction_top; } void set_compaction_top(HeapWord* value) { _compaction_top = value; } size_t allowed_dead_ratio() { return _allowed_dead_ratio; } void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; } // Work methods void adjust_pointers(); void precompact(); void compact(bool mangle_free_space); };