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_MODREFBARRIERSET_INLINE_HPP
26 #define SHARE_VM_GC_SHARED_MODREFBARRIERSET_INLINE_HPP
27
28 #include "gc/shared/barrierSet.hpp"
29 #include "gc/shared/modRefBarrierSet.hpp"
30 #include "oops/klass.inline.hpp"
31 #include "oops/objArrayOop.hpp"
32 #include "oops/oop.hpp"
33
34 // count is number of array elements being written
35 void ModRefBarrierSet::write_ref_array(HeapWord* start, size_t count) {
36 HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));
37 // In the case of compressed oops, start and end may potentially be misaligned;
38 // so we need to conservatively align the first downward (this is not
39 // strictly necessary for current uses, but a case of good hygiene and,
40 // if you will, aesthetics) and the second upward (this is essential for
41 // current uses) to a HeapWord boundary, so we mark all cards overlapping
42 // this write. If this evolves in the future to calling a
43 // logging barrier of narrow oop granularity, like the pre-barrier for G1
44 // (mentioned here merely by way of example), we will need to change this
45 // interface, so it is "exactly precise" (if i may be allowed the adverbial
46 // redundancy for emphasis) and does not include narrow oop slots not
47 // included in the original write interval.
48 HeapWord* aligned_start = align_down(start, HeapWordSize);
49 HeapWord* aligned_end = align_up (end, HeapWordSize);
88 }
89
90 template <DecoratorSet decorators, typename BarrierSetT>
91 template <typename T>
92 inline bool ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
93 oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
94 BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
95
96 if (!HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value) {
97 // Optimized covariant case
98 bs->write_ref_array_pre(dst, length,
99 HasDecorator<decorators, AS_DEST_NOT_INITIALIZED>::value);
100 Raw::oop_arraycopy(src_obj, dst_obj, src, dst, length);
101 bs->write_ref_array((HeapWord*)dst, length);
102 } else {
103 Klass* bound = objArrayOop(dst_obj)->element_klass();
104 T* from = src;
105 T* end = from + length;
106 for (T* p = dst; from < end; from++, p++) {
107 T element = *from;
108 if (bound->is_instanceof_or_null(element)) {
109 bs->template write_ref_field_pre<decorators>(p);
110 *p = element;
111 } else {
112 // We must do a barrier to cover the partial copy.
113 const size_t pd = pointer_delta(p, dst, (size_t)heapOopSize);
114 // pointer delta is scaled to number of elements (length field in
115 // objArrayOop) which we assume is 32 bit.
116 assert(pd == (size_t)(int)pd, "length field overflow");
117 bs->write_ref_array((HeapWord*)dst, pd);
118 return false;
119 }
120 }
121 bs->write_ref_array((HeapWord*)dst, length);
122 }
123 return true;
124 }
125
126 template <DecoratorSet decorators, typename BarrierSetT>
127 inline void ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
128 clone_in_heap(oop src, oop dst, size_t size) {
|
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_MODREFBARRIERSET_INLINE_HPP
26 #define SHARE_VM_GC_SHARED_MODREFBARRIERSET_INLINE_HPP
27
28 #include "gc/shared/barrierSet.hpp"
29 #include "gc/shared/modRefBarrierSet.hpp"
30 #include "oops/compressedOops.inline.hpp"
31 #include "oops/klass.inline.hpp"
32 #include "oops/objArrayOop.hpp"
33 #include "oops/oop.hpp"
34
35 // count is number of array elements being written
36 void ModRefBarrierSet::write_ref_array(HeapWord* start, size_t count) {
37 HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));
38 // In the case of compressed oops, start and end may potentially be misaligned;
39 // so we need to conservatively align the first downward (this is not
40 // strictly necessary for current uses, but a case of good hygiene and,
41 // if you will, aesthetics) and the second upward (this is essential for
42 // current uses) to a HeapWord boundary, so we mark all cards overlapping
43 // this write. If this evolves in the future to calling a
44 // logging barrier of narrow oop granularity, like the pre-barrier for G1
45 // (mentioned here merely by way of example), we will need to change this
46 // interface, so it is "exactly precise" (if i may be allowed the adverbial
47 // redundancy for emphasis) and does not include narrow oop slots not
48 // included in the original write interval.
49 HeapWord* aligned_start = align_down(start, HeapWordSize);
50 HeapWord* aligned_end = align_up (end, HeapWordSize);
89 }
90
91 template <DecoratorSet decorators, typename BarrierSetT>
92 template <typename T>
93 inline bool ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
94 oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
95 BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
96
97 if (!HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value) {
98 // Optimized covariant case
99 bs->write_ref_array_pre(dst, length,
100 HasDecorator<decorators, AS_DEST_NOT_INITIALIZED>::value);
101 Raw::oop_arraycopy(src_obj, dst_obj, src, dst, length);
102 bs->write_ref_array((HeapWord*)dst, length);
103 } else {
104 Klass* bound = objArrayOop(dst_obj)->element_klass();
105 T* from = src;
106 T* end = from + length;
107 for (T* p = dst; from < end; from++, p++) {
108 T element = *from;
109 if (oopDesc::is_instanceof_or_null(CompressedOops::decode(element), bound)) {
110 bs->template write_ref_field_pre<decorators>(p);
111 *p = element;
112 } else {
113 // We must do a barrier to cover the partial copy.
114 const size_t pd = pointer_delta(p, dst, (size_t)heapOopSize);
115 // pointer delta is scaled to number of elements (length field in
116 // objArrayOop) which we assume is 32 bit.
117 assert(pd == (size_t)(int)pd, "length field overflow");
118 bs->write_ref_array((HeapWord*)dst, pd);
119 return false;
120 }
121 }
122 bs->write_ref_array((HeapWord*)dst, length);
123 }
124 return true;
125 }
126
127 template <DecoratorSet decorators, typename BarrierSetT>
128 inline void ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
129 clone_in_heap(oop src, oop dst, size_t size) {
|