23 */
24
25 #ifndef SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
26 #define SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
27
28 #include "jfr/utilities/jfrTypes.hpp"
29 #include "runtime/atomic.hpp"
30 #include "runtime/orderAccess.hpp"
31 #include "utilities/macros.hpp"
32
33 #ifdef VM_LITTLE_ENDIAN
34 static const int low_offset = 0;
35 static const int leakp_offset = low_offset + 1;
36 #else
37 static const int low_offset = 7;
38 static const int leakp_offset = low_offset - 1;
39 #endif
40
41 inline void set_bits(jbyte bits, jbyte* const dest) {
42 assert(dest != NULL, "invariant");
43 const jbyte current = OrderAccess::load_acquire(dest);
44 if (bits != (current & bits)) {
45 *dest |= bits;
46 }
47 }
48
49 inline void set_mask(jbyte mask, jbyte* const dest) {
50 assert(dest != NULL, "invariant");
51 const jbyte current = OrderAccess::load_acquire(dest);
52 if (mask != (current & mask)) {
53 *dest &= mask;
54 }
55 }
56
57 inline void set_bits_cas(jbyte bits, jbyte* const dest) {
58 assert(dest != NULL, "invariant");
59 do {
60 const jbyte current = OrderAccess::load_acquire(dest);
61 if (bits == (current & bits)) {
62 return;
63 }
64 const jbyte new_value = current | bits;
65 if (Atomic::cmpxchg(new_value, dest, current) == current) {
66 return;
67 }
68 } while (true);
69 }
70
71 inline void clear_bits_cas(jbyte bits, jbyte* const dest) {
72 assert(dest != NULL, "invariant");
73 do {
74 const jbyte current = OrderAccess::load_acquire(dest);
75 if (bits != (current & bits)) {
76 return;
77 }
78 const jbyte new_value = current ^ bits;
79 if (Atomic::cmpxchg(new_value, dest, current) == current) {
80 return;
81 }
82 } while (true);
83 }
84
85 inline void set_traceid_bits(jbyte bits, traceid* dest) {
86 set_bits(bits, ((jbyte*)dest) + low_offset);
87 }
88
89 inline void set_traceid_bits_cas(jbyte bits, traceid* dest) {
90 set_bits_cas(bits, ((jbyte*)dest) + low_offset);
91 }
92
93 inline void set_traceid_mask(jbyte mask, traceid* dest) {
94 set_mask(mask, ((jbyte*)dest) + low_offset);
95 }
96
97 inline void set_leakp_traceid_bits(jbyte bits, traceid* dest) {
98 set_bits(bits, ((jbyte*)dest) + leakp_offset);
99 }
100
101 inline void set_leakp_traceid_bits_cas(jbyte bits, traceid* dest) {
102 set_bits_cas(bits, ((jbyte*)dest) + leakp_offset);
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23 */
24
25 #ifndef SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
26 #define SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
27
28 #include "jfr/utilities/jfrTypes.hpp"
29 #include "runtime/atomic.hpp"
30 #include "runtime/orderAccess.hpp"
31 #include "utilities/macros.hpp"
32
33 #ifdef VM_LITTLE_ENDIAN
34 static const int low_offset = 0;
35 static const int leakp_offset = low_offset + 1;
36 #else
37 static const int low_offset = 7;
38 static const int leakp_offset = low_offset - 1;
39 #endif
40
41 inline void set_bits(jbyte bits, jbyte* const dest) {
42 assert(dest != NULL, "invariant");
43 if (bits != (*dest & bits)) {
44 *dest |= bits;
45 }
46 }
47
48 inline jbyte traceid_and(jbyte current, jbyte bits) {
49 return current & bits;
50 }
51
52 inline jbyte traceid_or(jbyte current, jbyte bits) {
53 return current | bits;
54 }
55
56 inline jbyte traceid_xor(jbyte current, jbyte bits) {
57 return current ^ bits;
58 }
59
60 template <jbyte op(jbyte, jbyte)>
61 inline void set_bits_cas_form(jbyte bits, jbyte* const dest) {
62 assert(dest != NULL, "invariant");
63 do {
64 const jbyte current = OrderAccess::load_acquire(dest);
65 const jbyte new_value = op(current, bits);
66 if (Atomic::cmpxchg(new_value, dest, current) == current) {
67 return;
68 }
69 } while (true);
70 }
71
72 inline void set_bits_cas(jbyte bits, jbyte* const dest) {
73 set_bits_cas_form<traceid_or>(bits, dest);
74 }
75
76 inline void clear_bits_cas(jbyte bits, jbyte* const dest) {
77 set_bits_cas_form<traceid_xor>(bits, dest);
78 }
79
80 inline void set_mask(jbyte mask, jbyte* const dest) {
81 set_bits_cas_form<traceid_and>(mask, dest);
82 }
83
84 inline void set_traceid_bits(jbyte bits, traceid* dest) {
85 set_bits(bits, ((jbyte*)dest) + low_offset);
86 }
87
88 inline void set_traceid_bits_cas(jbyte bits, traceid* dest) {
89 set_bits_cas(bits, ((jbyte*)dest) + low_offset);
90 }
91
92 inline void set_traceid_mask(jbyte mask, traceid* dest) {
93 set_mask(mask, ((jbyte*)dest) + low_offset);
94 }
95
96 inline void set_leakp_traceid_bits(jbyte bits, traceid* dest) {
97 set_bits(bits, ((jbyte*)dest) + leakp_offset);
98 }
99
100 inline void set_leakp_traceid_bits_cas(jbyte bits, traceid* dest) {
101 set_bits_cas(bits, ((jbyte*)dest) + leakp_offset);
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