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_G1_G1BIASEDARRAY_HPP
26 #define SHARE_VM_GC_G1_G1BIASEDARRAY_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/memRegion.hpp"
30 #include "utilities/debug.hpp"
31
32 // Implements the common base functionality for arrays that contain provisions
33 // for accessing its elements using a biased index.
34 // The element type is defined by the instantiating the template.
35 class G1BiasedMappedArrayBase VALUE_OBJ_CLASS_SPEC {
36 friend class VMStructs;
37 public:
38 typedef size_t idx_t;
39 protected:
40 address _base; // the real base address
41 size_t _length; // the length of the array
42 address _biased_base; // base address biased by "bias" elements
43 size_t _bias; // the bias, i.e. the offset biased_base is located to the right in elements
44 uint _shift_by; // the amount of bits to shift right when mapping to an index of the array.
45
46 protected:
47
48 G1BiasedMappedArrayBase() : _base(NULL), _length(0), _biased_base(NULL),
49 _bias(0), _shift_by(0) { }
50
51 // Allocate a new array, generic version.
52 static address create_new_base_array(size_t length, size_t elem_size);
53
54 // Initialize the members of this class. The biased start address of this array
55 // is the bias (in elements) multiplied by the element size.
|
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_G1_G1BIASEDARRAY_HPP
26 #define SHARE_VM_GC_G1_G1BIASEDARRAY_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "utilities/debug.hpp"
30
31 // Implements the common base functionality for arrays that contain provisions
32 // for accessing its elements using a biased index.
33 // The element type is defined by the instantiating the template.
34 class G1BiasedMappedArrayBase {
35 friend class VMStructs;
36 public:
37 typedef size_t idx_t;
38 protected:
39 address _base; // the real base address
40 size_t _length; // the length of the array
41 address _biased_base; // base address biased by "bias" elements
42 size_t _bias; // the bias, i.e. the offset biased_base is located to the right in elements
43 uint _shift_by; // the amount of bits to shift right when mapping to an index of the array.
44
45 protected:
46
47 G1BiasedMappedArrayBase() : _base(NULL), _length(0), _biased_base(NULL),
48 _bias(0), _shift_by(0) { }
49
50 // Allocate a new array, generic version.
51 static address create_new_base_array(size_t length, size_t elem_size);
52
53 // Initialize the members of this class. The biased start address of this array
54 // is the bias (in elements) multiplied by the element size.
|