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annotate src/share/vm/gc_implementation/shared/spaceDecorator.hpp @ 1972:f95d63e2154a

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6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
author stefank
date Tue, 23 Nov 2010 13:22:55 -0800
parents c18cbe5936b8
children d2a62e0f25eb
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1 /*
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2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP
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27
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28 #include "gc_implementation/shared/mutableSpace.hpp"
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29 #include "memory/space.hpp"
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30 #include "utilities/globalDefinitions.hpp"
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31
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32 class SpaceDecorator: public AllStatic {
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33 public:
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34 // Initialization flags.
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35 static const bool Clear = true;
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36 static const bool DontClear = false;
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37 static const bool Mangle = true;
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38 static const bool DontMangle = false;
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39 };
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40
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41 // Functionality for use with class Space and class MutableSpace.
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42 // The approach taken with the mangling is to mangle all
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43 // the space initially and then to mangle areas that have
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44 // been allocated since the last collection. Mangling is
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45 // done in the context of a generation and in the context
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46 // of a space.
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47 // The space in a generation is mangled when it is first
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48 // initialized and when the generation grows. The spaces
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49 // are not necessarily up-to-date when this mangling occurs
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50 // and the method mangle_region() is used.
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51 // After allocations have been done in a space, the space generally
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52 // need to be remangled. Remangling is only done on the
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53 // recently allocated regions in the space. Typically, that is
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54 // the region between the new top and the top just before a
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55 // garbage collection.
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56 // An exception to the usual mangling in a space is done when the
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57 // space is used for an extraordinary purpose. Specifically, when
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58 // to-space is used as scratch space for a mark-sweep-compact
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59 // collection.
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60 // Spaces are mangled after a collection. If the generation
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61 // grows after a collection, the added space is mangled as part of
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62 // the growth of the generation. No additional mangling is needed when the
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63 // spaces are resized after an expansion.
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64 // The class SpaceMangler keeps a pointer to the top of the allocated
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65 // area and provides the methods for doing the piece meal mangling.
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66 // Methods for doing sparces and full checking of the mangling are
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67 // included. The full checking is done if DEBUG_MANGLING is defined.
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68 // GenSpaceMangler is used with the GenCollectedHeap collectors and
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69 // MutableSpaceMangler is used with the ParallelScavengeHeap collectors.
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70 // These subclasses abstract the differences in the types of spaces used
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71 // by each heap.
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72
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73 class SpaceMangler: public CHeapObj {
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74 friend class VMStructs;
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75
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76 // High water mark for allocations. Typically, the space above
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77 // this point have been mangle previously and don't need to be
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78 // touched again. Space belows this point has been allocated
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79 // and remangling is needed between the current top and this
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80 // high water mark.
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81 HeapWord* _top_for_allocations;
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82 HeapWord* top_for_allocations() { return _top_for_allocations; }
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83
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84 public:
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85
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86 // Setting _top_for_allocations to NULL at initialization
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87 // makes it always below top so that mangling done as part
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88 // of the initialize() call of a space does nothing (as it
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89 // should since the mangling is done as part of the constructor
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90 // for the space.
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91 SpaceMangler() : _top_for_allocations(NULL) {}
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92
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93 // Methods for top and end that delegate to the specific
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94 // space type.
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95 virtual HeapWord* top() const = 0;
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96 virtual HeapWord* end() const = 0;
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97
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98 // Return true if q matches the mangled pattern.
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99 static bool is_mangled(HeapWord* q) PRODUCT_RETURN0;
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100
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101 // Used to save the an address in a space for later use during mangling.
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102 void set_top_for_allocations(HeapWord* v);
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103
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104 // Overwrites the unused portion of this space.
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105 // Mangle only the region not previously mangled [top, top_previously_mangled)
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106 void mangle_unused_area();
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107 // Mangle all the unused region [top, end)
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108 void mangle_unused_area_complete();
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109 // Do some sparse checking on the area that should have been mangled.
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110 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
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111 // Do a complete check of the area that should be mangled.
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112 void check_mangled_unused_area_complete() PRODUCT_RETURN;
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113
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114 // Mangle the MemRegion. This is a non-space specific mangler. It
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115 // is used during the initial mangling of a space before the space
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116 // is fully constructed. Also is used when a generation is expanded
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117 // and possibly before the spaces have been reshaped to to the new
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118 // size of the generation.
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119 static void mangle_region(MemRegion mr) PRODUCT_RETURN;
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120 };
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121
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122 class ContiguousSpace;
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123
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124 // For use with GenCollectedHeap's
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125 class GenSpaceMangler: public SpaceMangler {
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126 ContiguousSpace* _sp;
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127
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128 ContiguousSpace* sp() { return _sp; }
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129
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130 HeapWord* top() const { return _sp->top(); }
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131 HeapWord* end() const { return _sp->end(); }
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132
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133 public:
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134 GenSpaceMangler(ContiguousSpace* sp) : SpaceMangler(), _sp(sp) {}
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135 };
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136
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137 // For use with ParallelScavengeHeap's.
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138 class MutableSpaceMangler: public SpaceMangler {
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139 MutableSpace* _sp;
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140
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141 MutableSpace* sp() { return _sp; }
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142
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143 HeapWord* top() const { return _sp->top(); }
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144 HeapWord* end() const { return _sp->end(); }
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145
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146 public:
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147 MutableSpaceMangler(MutableSpace* sp) : SpaceMangler(), _sp(sp) {}
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148 };
1972
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149
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150 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP