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annotate src/share/vm/gc_implementation/shared/spaceDecorator.hpp @ 269:850fdf70db2b

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Merge
author jmasa
date Mon, 28 Jul 2008 15:30:23 -0700
parents 12eea04c8b06
children 9ee9cf798b59
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1 /*
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2 * Copyright 2002-2005 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 class SpaceDecorator: public AllStatic {
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26 public:
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27 // Initialization flags.
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28 static const bool Clear = true;
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29 static const bool DontClear = false;
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30 static const bool Mangle = true;
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31 static const bool DontMangle = false;
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32 };
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33
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34 // Functionality for use with class Space and class MutableSpace.
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35 // The approach taken with the mangling is to mangle all
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36 // the space initially and then to mangle areas that have
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37 // been allocated since the last collection. Mangling is
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38 // done in the context of a generation and in the context
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39 // of a space.
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40 // The space in a generation is mangled when it is first
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41 // initialized and when the generation grows. The spaces
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42 // are not necessarily up-to-date when this mangling occurs
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43 // and the method mangle_region() is used.
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44 // After allocations have been done in a space, the space generally
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45 // need to be remangled. Remangling is only done on the
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46 // recently allocated regions in the space. Typically, that is
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47 // the region between the new top and the top just before a
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48 // garbage collection.
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49 // An exception to the usual mangling in a space is done when the
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50 // space is used for an extraordinary purpose. Specifically, when
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51 // to-space is used as scratch space for a mark-sweep-compact
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52 // collection.
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53 // Spaces are mangled after a collection. If the generation
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54 // grows after a collection, the added space is mangled as part of
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55 // the growth of the generation. No additional mangling is needed when the
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56 // spaces are resized after an expansion.
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57 // The class SpaceMangler keeps a pointer to the top of the allocated
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58 // area and provides the methods for doing the piece meal mangling.
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59 // Methods for doing sparces and full checking of the mangling are
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60 // included. The full checking is done if DEBUG_MANGLING is defined.
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61 // GenSpaceMangler is used with the GenCollectedHeap collectors and
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62 // MutableSpaceMangler is used with the ParallelScavengeHeap collectors.
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63 // These subclasses abstract the differences in the types of spaces used
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64 // by each heap.
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65
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66 class SpaceMangler: public CHeapObj {
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67 friend class VMStructs;
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68
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69 // High water mark for allocations. Typically, the space above
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70 // this point have been mangle previously and don't need to be
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71 // touched again. Space belows this point has been allocated
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72 // and remangling is needed between the current top and this
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73 // high water mark.
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74 HeapWord* _top_for_allocations;
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75 HeapWord* top_for_allocations() { return _top_for_allocations; }
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76
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77 public:
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78
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79 // Setting _top_for_allocations to NULL at initialization
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80 // makes it always below top so that mangling done as part
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81 // of the initialize() call of a space does nothing (as it
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82 // should since the mangling is done as part of the constructor
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83 // for the space.
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84 SpaceMangler() : _top_for_allocations(NULL) {}
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85
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86 // Methods for top and end that delegate to the specific
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87 // space type.
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88 virtual HeapWord* top() const = 0;
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89 virtual HeapWord* end() const = 0;
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90
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91 // Return true if q matches the mangled pattern.
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92 static bool is_mangled(HeapWord* q) PRODUCT_RETURN0;
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93
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94 // Used to save the an address in a space for later use during mangling.
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95 void set_top_for_allocations(HeapWord* v);
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96
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97 // Overwrites the unused portion of this space.
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98 // Mangle only the region not previously mangled [top, top_previously_mangled)
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99 void mangle_unused_area();
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100 // Mangle all the unused region [top, end)
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101 void mangle_unused_area_complete();
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102 // Do some sparse checking on the area that should have been mangled.
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103 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
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104 // Do a complete check of the area that should be mangled.
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105 void check_mangled_unused_area_complete() PRODUCT_RETURN;
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106
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107 // Mangle the MemRegion. This is a non-space specific mangler. It
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108 // is used during the initial mangling of a space before the space
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109 // is fully constructed. Also is used when a generation is expanded
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110 // and possibly before the spaces have been reshaped to to the new
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111 // size of the generation.
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112 static void mangle_region(MemRegion mr);
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113 };
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114
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115 class ContiguousSpace;
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116
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117 // For use with GenCollectedHeap's
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118 class GenSpaceMangler: public SpaceMangler {
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119 ContiguousSpace* _sp;
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120
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121 ContiguousSpace* sp() { return _sp; }
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122
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123 HeapWord* top() const { return _sp->top(); }
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124 HeapWord* end() const { return _sp->end(); }
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125
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126 public:
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127 GenSpaceMangler(ContiguousSpace* sp) : SpaceMangler(), _sp(sp) {}
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128 };
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129
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130 // For use with ParallelScavengeHeap's.
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131 class MutableSpaceMangler: public SpaceMangler {
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132 MutableSpace* _sp;
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133
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134 MutableSpace* sp() { return _sp; }
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135
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136 HeapWord* top() const { return _sp->top(); }
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137 HeapWord* end() const { return _sp->end(); }
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138
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139 public:
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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140 MutableSpaceMangler(MutableSpace* sp) : SpaceMangler(), _sp(sp) {}
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141 };