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 #include "oops/markWord.hpp"
27 #include "oops/objLayout.hpp"
28 #include "runtime/globals.hpp"
29 #include "utilities/debug.hpp"
30 
31 ObjLayout::Mode ObjLayout::_klass_mode = ObjLayout::Undefined;
32 int ObjLayout::_oop_base_offset_in_bytes = 0;
33 bool ObjLayout::_oop_has_klass_gap = false;
34 
35 void ObjLayout::initialize() {
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 if (UseCompressedClassPointers) {
42     _klass_mode = Compressed;
43     _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(narrowKlass);
44     _oop_has_klass_gap = true;
45   } else {
46     _klass_mode = Uncompressed;
47     _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(Klass*);
48     _oop_has_klass_gap = false;
49   }
50 }

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 #include "oops/markWord.hpp"
27 #include "oops/objLayout.hpp"
28 #include "runtime/globals.hpp"
29 #include "utilities/debug.hpp"
30 
31 ObjLayout::Mode ObjLayout::_klass_mode = ObjLayout::Undefined;
32 int ObjLayout::_oop_base_offset_in_bytes = 0;
33 bool ObjLayout::_oop_has_klass_gap = false;
34 
35 void ObjLayout::initialize() {
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 if (UseCompressedClassPointers) {
42     _klass_mode = Compressed;
43     _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(narrowKlass);
44     _oop_has_klass_gap = true;
45   } else {
46     _klass_mode = Uncompressed;
47     _oop_base_offset_in_bytes = sizeof(markWord) + sizeof(Klass*);
48     _oop_has_klass_gap = false;
49   }
50 }