5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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_VM_MEMORY_BARRIERSET_HPP
26 #define SHARE_VM_MEMORY_BARRIERSET_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "utilities/fakeRttiSupport.hpp"
31
32 // This class provides the interface between a barrier implementation and
33 // the rest of the system.
34
35 class BarrierSet: public CHeapObj<mtGC> {
36 friend class VMStructs;
37 public:
38 // Fake RTTI support. For a derived class T to participate
39 // - T must have a corresponding Name entry.
40 // - GetName<T> must be specialized to return the corresponding Name
41 // entry.
42 // - If T is a base class, the constructor must have a FakeRtti
43 // parameter and pass it up to its base class, with the tag set
44 // augmented with the corresponding Name entry.
45 // - If T is a concrete class, the constructor must create a
46 // FakeRtti object whose tag set includes the corresponding Name
201 public:
202 // Inform the BarrierSet that the the covered heap region that starts
203 // with "base" has been changed to have the given size (possibly from 0,
204 // for initialization.)
205 virtual void resize_covered_region(MemRegion new_region) = 0;
206
207 // If the barrier set imposes any alignment restrictions on boundaries
208 // within the heap, this function tells whether they are met.
209 virtual bool is_aligned(HeapWord* addr) = 0;
210
211 // Print a description of the memory for the barrier set
212 virtual void print_on(outputStream* st) const = 0;
213 };
214
215 template<typename T>
216 inline T* barrier_set_cast(BarrierSet* bs) {
217 assert(bs->is_a(BarrierSet::GetName<T>::value), "wrong type of barrier set");
218 return static_cast<T*>(bs);
219 }
220
221 #endif // SHARE_VM_MEMORY_BARRIERSET_HPP
|
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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_VM_GC_SHARED_BARRIERSET_HPP
26 #define SHARE_VM_GC_SHARED_BARRIERSET_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "utilities/fakeRttiSupport.hpp"
31
32 // This class provides the interface between a barrier implementation and
33 // the rest of the system.
34
35 class BarrierSet: public CHeapObj<mtGC> {
36 friend class VMStructs;
37 public:
38 // Fake RTTI support. For a derived class T to participate
39 // - T must have a corresponding Name entry.
40 // - GetName<T> must be specialized to return the corresponding Name
41 // entry.
42 // - If T is a base class, the constructor must have a FakeRtti
43 // parameter and pass it up to its base class, with the tag set
44 // augmented with the corresponding Name entry.
45 // - If T is a concrete class, the constructor must create a
46 // FakeRtti object whose tag set includes the corresponding Name
201 public:
202 // Inform the BarrierSet that the the covered heap region that starts
203 // with "base" has been changed to have the given size (possibly from 0,
204 // for initialization.)
205 virtual void resize_covered_region(MemRegion new_region) = 0;
206
207 // If the barrier set imposes any alignment restrictions on boundaries
208 // within the heap, this function tells whether they are met.
209 virtual bool is_aligned(HeapWord* addr) = 0;
210
211 // Print a description of the memory for the barrier set
212 virtual void print_on(outputStream* st) const = 0;
213 };
214
215 template<typename T>
216 inline T* barrier_set_cast(BarrierSet* bs) {
217 assert(bs->is_a(BarrierSet::GetName<T>::value), "wrong type of barrier set");
218 return static_cast<T*>(bs);
219 }
220
221 #endif // SHARE_VM_GC_SHARED_BARRIERSET_HPP
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