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 "oops/markWord.hpp"
26 #include "oops/objLayout.hpp"
27 #include "runtime/globals.hpp"
28 #include "utilities/debug.hpp"
29
30 ObjLayout::Mode ObjLayout::_klass_mode = ObjLayout::Undefined;
31 int ObjLayout::_oop_base_offset_in_bytes = 0;
32 bool ObjLayout::_oop_has_klass_gap = false;
33
34 void ObjLayout::initialize() {
35 #ifdef _LP64
36 assert(_klass_mode == Undefined, "ObjLayout initialized twice");
37 if (UseCompactObjectHeaders) {
38 _klass_mode = Compact;
39 _oop_base_offset_in_bytes = sizeof(markWord);
40 _oop_has_klass_gap = false;
41 } else {
42 _klass_mode = Compressed;
43 _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(narrowKlass);
44 _oop_has_klass_gap = true;
45 }
46 #else
47 assert(_klass_mode == Undefined, "ObjLayout initialized twice");
48 assert(!UseCompactObjectHeaders, "COH unsupported on 32-bit");
49 // We support narrow Klass pointers on 32-bit, but the layout
50 // is exactly the same as it was with uncompressed klass pointers
51 _klass_mode = Compressed;
52 _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(Klass*);
53 _oop_has_klass_gap = false;
54 #endif
55 }
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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 "oops/markWord.hpp"
26 #include "oops/objLayout.hpp"
27 #include "runtime/globals.hpp"
28 #include "utilities/debug.hpp"
29
30 ObjLayout::Mode ObjLayout::_klass_mode = ObjLayout::Undefined;
31 int ObjLayout::_oop_base_offset_in_bytes = 0;
32 bool ObjLayout::_oop_has_klass_gap = false;
33
34 void ObjLayout::initialize() {
35 #ifdef _LP64
36 assert(_klass_mode == Undefined, "ObjLayout initialized twice");
37 if (UseCompactObjectHeaders) {
38 _klass_mode = Compact;
39 _oop_base_offset_in_bytes = sizeof(uint32_t);
40 _oop_has_klass_gap = true;
41 } else {
42 _klass_mode = Compressed;
43 _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(narrowKlass);
44 _oop_has_klass_gap = true;
45 }
46 #else
47 assert(_klass_mode == Undefined, "ObjLayout initialized twice");
48 assert(!UseCompactObjectHeaders, "COH unsupported on 32-bit");
49 // We support narrow Klass pointers on 32-bit, but the layout
50 // is exactly the same as it was with uncompressed klass pointers
51 _klass_mode = Compressed;
52 _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(Klass*);
53 _oop_has_klass_gap = false;
54 #endif
55 }
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