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 #include "precompiled.hpp"
26
27 #include "gc/shared/blockOffsetTable.inline.hpp"
28 #include "gc/shared/cardGeneration.inline.hpp"
29 #include "gc/shared/gcLocker.hpp"
30 #include "gc/shared/genOopClosures.inline.hpp"
31 #include "gc/shared/genRemSet.hpp"
32 #include "gc/shared/generationSpec.hpp"
33 #include "gc/shared/space.inline.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/memRegion.hpp"
36 #include "runtime/java.hpp"
37
38 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size,
39 int level,
40 GenRemSet* remset) :
41 Generation(rs, initial_byte_size, level), _rs(remset),
42 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(),
43 _used_at_prologue()
44 {
45 HeapWord* start = (HeapWord*)rs.base();
46 size_t reserved_byte_size = rs.size();
47 assert((uintptr_t(start) & 3) == 0, "bad alignment");
48 assert((reserved_byte_size & 3) == 0, "bad alignment");
49 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size));
50 _bts = new BlockOffsetSharedArray(reserved_mr,
51 heap_word_size(initial_byte_size));
52 MemRegion committed_mr(start, heap_word_size(initial_byte_size));
53 _rs->resize_covered_region(committed_mr);
54 if (_bts == NULL) {
55 vm_exit_during_initialization("Could not allocate a BlockOffsetArray");
56 }
57
58 // Verify that the start and end of this generation is the start of a card.
59 // If this wasn't true, a single card could span more than on generation,
60 // which would cause problems when we commit/uncommit memory, and when we
61 // clear and dirty cards.
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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 #include "precompiled.hpp"
26
27 #include "gc/shared/blockOffsetTable.inline.hpp"
28 #include "gc/shared/cardGeneration.inline.hpp"
29 #include "gc/shared/gcLocker.hpp"
30 #include "gc/shared/genOopClosures.inline.hpp"
31 #include "gc/shared/genRemSet.hpp"
32 #include "gc/shared/generationSpec.hpp"
33 #include "gc/shared/space.inline.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/memRegion.hpp"
36 #include "runtime/java.hpp"
37
38 CardGeneration::CardGeneration(ReservedSpace rs,
39 size_t initial_byte_size,
40 GenRemSet* remset) :
41 Generation(rs, initial_byte_size), _rs(remset),
42 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(),
43 _used_at_prologue()
44 {
45 HeapWord* start = (HeapWord*)rs.base();
46 size_t reserved_byte_size = rs.size();
47 assert((uintptr_t(start) & 3) == 0, "bad alignment");
48 assert((reserved_byte_size & 3) == 0, "bad alignment");
49 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size));
50 _bts = new BlockOffsetSharedArray(reserved_mr,
51 heap_word_size(initial_byte_size));
52 MemRegion committed_mr(start, heap_word_size(initial_byte_size));
53 _rs->resize_covered_region(committed_mr);
54 if (_bts == NULL) {
55 vm_exit_during_initialization("Could not allocate a BlockOffsetArray");
56 }
57
58 // Verify that the start and end of this generation is the start of a card.
59 // If this wasn't true, a single card could span more than on generation,
60 // which would cause problems when we commit/uncommit memory, and when we
61 // clear and dirty cards.
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