8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHARED_SPACEDECORATOR_HPP
26 #define SHARE_GC_SHARED_SPACEDECORATOR_HPP
27
28 #include "gc/parallel/mutableSpace.hpp"
29 #include "gc/shared/space.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 class SpaceDecorator: public AllStatic {
33 public:
34 // Initialization flags.
35 static const bool Clear = true;
36 static const bool DontClear = false;
37 static const bool Mangle = true;
38 static const bool DontMangle = false;
39 };
40
41 // Functionality for use with class Space and class MutableSpace.
42 // The approach taken with the mangling is to mangle all
43 // the space initially and then to mangle areas that have
44 // been allocated since the last collection. Mangling is
45 // done in the context of a generation and in the context
46 // of a space.
47 // The space in a generation is mangled when it is first
48 // initialized and when the generation grows. The spaces
49 // are not necessarily up-to-date when this mangling occurs
103
104 // Overwrites the unused portion of this space.
105 // Mangle only the region not previously mangled [top, top_previously_mangled)
106 void mangle_unused_area();
107 // Mangle all the unused region [top, end)
108 void mangle_unused_area_complete();
109 // Do some sparse checking on the area that should have been mangled.
110 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
111 // Do a complete check of the area that should be mangled.
112 void check_mangled_unused_area_complete() PRODUCT_RETURN;
113
114 // Mangle the MemRegion. This is a non-space specific mangler. It
115 // is used during the initial mangling of a space before the space
116 // is fully constructed. Also is used when a generation is expanded
117 // and possibly before the spaces have been reshaped to to the new
118 // size of the generation.
119 static void mangle_region(MemRegion mr) PRODUCT_RETURN;
120 };
121
122 class ContiguousSpace;
123
124 // For use with GenCollectedHeap's
125 class GenSpaceMangler: public SpaceMangler {
126 ContiguousSpace* _sp;
127
128 ContiguousSpace* sp() { return _sp; }
129
130 HeapWord* top() const { return _sp->top(); }
131 HeapWord* end() const { return _sp->end(); }
132
133 public:
134 GenSpaceMangler(ContiguousSpace* sp) : SpaceMangler(), _sp(sp) {}
135 };
136
137 // For use with ParallelScavengeHeap's.
138 class MutableSpaceMangler: public SpaceMangler {
139 MutableSpace* _sp;
140
141 MutableSpace* sp() { return _sp; }
142
143 HeapWord* top() const { return _sp->top(); }
144 HeapWord* end() const { return _sp->end(); }
145
146 public:
147 MutableSpaceMangler(MutableSpace* sp) : SpaceMangler(), _sp(sp) {}
148 };
149
150 #endif // SHARE_GC_SHARED_SPACEDECORATOR_HPP
|
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHARED_SPACEDECORATOR_HPP
26 #define SHARE_GC_SHARED_SPACEDECORATOR_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/memRegion.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 class SpaceDecorator: public AllStatic {
33 public:
34 // Initialization flags.
35 static const bool Clear = true;
36 static const bool DontClear = false;
37 static const bool Mangle = true;
38 static const bool DontMangle = false;
39 };
40
41 // Functionality for use with class Space and class MutableSpace.
42 // The approach taken with the mangling is to mangle all
43 // the space initially and then to mangle areas that have
44 // been allocated since the last collection. Mangling is
45 // done in the context of a generation and in the context
46 // of a space.
47 // The space in a generation is mangled when it is first
48 // initialized and when the generation grows. The spaces
49 // are not necessarily up-to-date when this mangling occurs
103
104 // Overwrites the unused portion of this space.
105 // Mangle only the region not previously mangled [top, top_previously_mangled)
106 void mangle_unused_area();
107 // Mangle all the unused region [top, end)
108 void mangle_unused_area_complete();
109 // Do some sparse checking on the area that should have been mangled.
110 void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
111 // Do a complete check of the area that should be mangled.
112 void check_mangled_unused_area_complete() PRODUCT_RETURN;
113
114 // Mangle the MemRegion. This is a non-space specific mangler. It
115 // is used during the initial mangling of a space before the space
116 // is fully constructed. Also is used when a generation is expanded
117 // and possibly before the spaces have been reshaped to to the new
118 // size of the generation.
119 static void mangle_region(MemRegion mr) PRODUCT_RETURN;
120 };
121
122 class ContiguousSpace;
123 class MutableSpace;
124
125 // For use with GenCollectedHeap's
126 class GenSpaceMangler: public SpaceMangler {
127 ContiguousSpace* _sp;
128
129 ContiguousSpace* sp() { return _sp; }
130
131 HeapWord* top() const;
132 HeapWord* end() const;
133
134 public:
135 GenSpaceMangler(ContiguousSpace* sp) : SpaceMangler(), _sp(sp) {}
136 };
137
138 // For use with ParallelScavengeHeap's.
139 class MutableSpaceMangler: public SpaceMangler {
140 MutableSpace* _sp;
141
142 MutableSpace* sp() { return _sp; }
143
144 HeapWord* top() const;
145 HeapWord* end() const;
146
147 public:
148 MutableSpaceMangler(MutableSpace* sp) : SpaceMangler(), _sp(sp) {}
149 };
150
151 #endif // SHARE_GC_SHARED_SPACEDECORATOR_HPP
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