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_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
26 #define SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
27
28 #include "oops/oopsHierarchy.hpp"
29 #include "memory/allocation.hpp"
30
31 class G1CMTask;
32
33 // Helper class to mark through large objArrays during marking in an efficient way.
34 // Instead of pushing large object arrays, we push continuations onto the
35 // mark stack. These continuations are identified by having their LSB set.
36 // This allows incremental processing of large objects.
37 class G1CMObjArrayProcessor VALUE_OBJ_CLASS_SPEC {
38 private:
39 // Reference to the task for doing the actual work.
40 G1CMTask* _task;
41
42 // Push the continuation at the given address onto the mark stack.
43 void push_array_slice(HeapWord* addr);
44
45 // Process (apply the closure) on the given continuation of the given objArray.
46 size_t process_array_slice(objArrayOop const obj, HeapWord* start_from, size_t remaining);
47 public:
48 static bool should_be_sliced(oop obj);
49
50 G1CMObjArrayProcessor(G1CMTask* task) : _task(task) {
51 }
52
53 // Process the given continuation. Returns the number of words scanned.
54 size_t process_slice(HeapWord* slice);
55 // Start processing the given objArrayOop by scanning the header and pushing its
56 // continuation.
57 size_t process_obj(oop obj);
|
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_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
26 #define SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
27
28 #include "oops/oopsHierarchy.hpp"
29
30 class G1CMTask;
31
32 // Helper class to mark through large objArrays during marking in an efficient way.
33 // Instead of pushing large object arrays, we push continuations onto the
34 // mark stack. These continuations are identified by having their LSB set.
35 // This allows incremental processing of large objects.
36 class G1CMObjArrayProcessor {
37 private:
38 // Reference to the task for doing the actual work.
39 G1CMTask* _task;
40
41 // Push the continuation at the given address onto the mark stack.
42 void push_array_slice(HeapWord* addr);
43
44 // Process (apply the closure) on the given continuation of the given objArray.
45 size_t process_array_slice(objArrayOop const obj, HeapWord* start_from, size_t remaining);
46 public:
47 static bool should_be_sliced(oop obj);
48
49 G1CMObjArrayProcessor(G1CMTask* task) : _task(task) {
50 }
51
52 // Process the given continuation. Returns the number of words scanned.
53 size_t process_slice(HeapWord* slice);
54 // Start processing the given objArrayOop by scanning the header and pushing its
55 // continuation.
56 size_t process_obj(oop obj);
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