40 * the code once, but it is problematic in GC hotpath code.
41 *
42 * b. With filler object mechanics, we may need to allocate more space for
43 * the forwarding ptr to meet alignment requirements for objects. This
44 * means *_offset and *_size calls are NOT interchangeable. The accesses
45 * to forwarding ptrs should always be via *_offset. Storage size
46 * calculations should always be via *_size.
47 */
48
49 /* Offset from the object start, in HeapWords. */
50 static inline int word_offset() {
51 return -1; // exactly one HeapWord
52 }
53
54 /* Offset from the object start, in bytes. */
55 static inline int byte_offset() {
56 return -HeapWordSize; // exactly one HeapWord
57 }
58
59 /* Allocated size, in HeapWords. */
60 static inline size_t word_size() {
61 return MinObjAlignment;
62 }
63
64 /* Allocated size, in bytes */
65 static inline size_t byte_size() {
66 return MinObjAlignmentInBytes;
67 }
68
69 /* Initializes Brooks pointer (to self).
70 */
71 static inline void initialize(oop obj);
72
73 /* Gets forwardee from the given object.
74 */
75 static inline oop forwardee(oop obj);
76
77 /* Forcefully sets forwardee in $holder to $update.
78 */
79 static inline void set_forwardee(oop obj, oop update);
80
81 /* Tries to atomically update forwardee in $holder object to $update.
82 * Assumes $holder points at itself.
83 * Asserts $holder is in from-space.
84 * Asserts $update is in to-space.
85 */
86 static inline oop try_update_forwardee(oop obj, oop update);
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40 * the code once, but it is problematic in GC hotpath code.
41 *
42 * b. With filler object mechanics, we may need to allocate more space for
43 * the forwarding ptr to meet alignment requirements for objects. This
44 * means *_offset and *_size calls are NOT interchangeable. The accesses
45 * to forwarding ptrs should always be via *_offset. Storage size
46 * calculations should always be via *_size.
47 */
48
49 /* Offset from the object start, in HeapWords. */
50 static inline int word_offset() {
51 return -1; // exactly one HeapWord
52 }
53
54 /* Offset from the object start, in bytes. */
55 static inline int byte_offset() {
56 return -HeapWordSize; // exactly one HeapWord
57 }
58
59 /* Allocated size, in HeapWords. */
60 static inline uint word_size() {
61 return (uint) MinObjAlignment;
62 }
63
64 /* Allocated size, in bytes */
65 static inline uint byte_size() {
66 return (uint) MinObjAlignmentInBytes;
67 }
68
69 /* Assert basic stuff once at startup. */
70 static void initial_checks() {
71 guarantee (MinObjAlignment > 0, "sanity, word_size is correct");
72 guarantee (MinObjAlignmentInBytes > 0, "sanity, byte_size is correct");
73 }
74
75 /* Initializes Brooks pointer (to self).
76 */
77 static inline void initialize(oop obj);
78
79 /* Gets forwardee from the given object.
80 */
81 static inline oop forwardee(oop obj);
82
83 /* Forcefully sets forwardee in $holder to $update.
84 */
85 static inline void set_forwardee(oop obj, oop update);
86
87 /* Tries to atomically update forwardee in $holder object to $update.
88 * Assumes $holder points at itself.
89 * Asserts $holder is in from-space.
90 * Asserts $update is in to-space.
91 */
92 static inline oop try_update_forwardee(oop obj, oop update);
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