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1 /*
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2 * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 //
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26 // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
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27 // to a MutableSpace.
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28 //
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29
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30 class ObjectStartArray;
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31
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32 class PSMarkSweepDecorator: public CHeapObj {
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33 private:
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34 static PSMarkSweepDecorator* _destination_decorator;
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35
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36 protected:
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37 MutableSpace* _space;
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38 ObjectStartArray* _start_array;
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39 HeapWord* _first_dead;
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40 HeapWord* _end_of_live;
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41 HeapWord* _compaction_top;
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42 unsigned int _allowed_dead_ratio;
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43
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44 bool insert_deadspace(ssize_t& allowed_deadspace_words, HeapWord* q, size_t word_len);
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45
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46 public:
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47 PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
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48 unsigned int allowed_dead_ratio) :
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49 _space(space), _start_array(start_array), _allowed_dead_ratio(allowed_dead_ratio) { }
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50
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51 // During a compacting collection, we need to collapse objects into
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52 // spaces in a given order. We want to fill space A, space B, and so
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53 // on. The code that controls that order is in the following methods.
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54 static void set_destination_decorator_tenured();
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55 static void set_destination_decorator_perm_gen();
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56 static void advance_destination_decorator();
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57 static PSMarkSweepDecorator* destination_decorator();
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58
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59 // Accessors
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60 MutableSpace* space() { return _space; }
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61 ObjectStartArray* start_array() { return _start_array; }
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62
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63 HeapWord* compaction_top() { return _compaction_top; }
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64 void set_compaction_top(HeapWord* value) { _compaction_top = value; }
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65
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66 unsigned int allowed_dead_ratio() { return _allowed_dead_ratio; }
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67 void set_allowed_dead_ratio(unsigned int value) { _allowed_dead_ratio = value; }
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68
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69 // Work methods
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70 void adjust_pointers();
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71 void precompact();
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72 void compact(bool mangle_free_space);
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73 };
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