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_OOPS_FIELDINFO_HPP
26 #define SHARE_VM_OOPS_FIELDINFO_HPP
27
28 #include "oops/constantPool.hpp"
29 #include "oops/typeArrayOop.hpp"
30 #include "classfile/vmSymbols.hpp"
31
32 // This class represents the field information contained in the fields
33 // array of an InstanceKlass. Currently it's laid on top an array of
34 // Java shorts but in the future it could simply be used as a real
35 // array type. FieldInfo generally shouldn't be used directly.
36 // Fields should be queried either through InstanceKlass or through
37 // the various FieldStreams.
38 class FieldInfo VALUE_OBJ_CLASS_SPEC {
39 friend class fieldDescriptor;
40 friend class JavaFieldStream;
41 friend class ClassFileParser;
42
43 public:
44 // fields
45 // Field info extracted from the class file and stored
46 // as an array of 6 shorts.
47
48 #define FIELDINFO_TAG_SIZE 2
49 #define FIELDINFO_TAG_BLANK 0
50 #define FIELDINFO_TAG_OFFSET 1
51 #define FIELDINFO_TAG_TYPE_PLAIN 2
52 #define FIELDINFO_TAG_TYPE_CONTENDED 3
53 #define FIELDINFO_TAG_MASK 3
54
55 // Packed field has the tag, and can be either of:
56 // hi bits <--------------------------- lo bits
57 // |---------high---------|---------low---------|
58 // ..........................................00 - blank
|
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_OOPS_FIELDINFO_HPP
26 #define SHARE_VM_OOPS_FIELDINFO_HPP
27
28 #include "oops/constantPool.hpp"
29 #include "oops/typeArrayOop.hpp"
30 #include "classfile/vmSymbols.hpp"
31
32 // This class represents the field information contained in the fields
33 // array of an InstanceKlass. Currently it's laid on top an array of
34 // Java shorts but in the future it could simply be used as a real
35 // array type. FieldInfo generally shouldn't be used directly.
36 // Fields should be queried either through InstanceKlass or through
37 // the various FieldStreams.
38 class FieldInfo {
39 friend class fieldDescriptor;
40 friend class JavaFieldStream;
41 friend class ClassFileParser;
42
43 public:
44 // fields
45 // Field info extracted from the class file and stored
46 // as an array of 6 shorts.
47
48 #define FIELDINFO_TAG_SIZE 2
49 #define FIELDINFO_TAG_BLANK 0
50 #define FIELDINFO_TAG_OFFSET 1
51 #define FIELDINFO_TAG_TYPE_PLAIN 2
52 #define FIELDINFO_TAG_TYPE_CONTENDED 3
53 #define FIELDINFO_TAG_MASK 3
54
55 // Packed field has the tag, and can be either of:
56 // hi bits <--------------------------- lo bits
57 // |---------high---------|---------low---------|
58 // ..........................................00 - blank
|