10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
26 #define SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
27
28 #include "jfr/utilities/jfrTypes.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/orderAccess.hpp"
31
32 #define USED_BIT 1
33 #define METHOD_USED_BIT (USED_BIT << 2)
34 #define EPOCH_1_SHIFT 0
35 #define EPOCH_2_SHIFT 1
36 #define USED_EPOCH_1_BIT (USED_BIT << EPOCH_1_SHIFT)
37 #define USED_EPOCH_2_BIT (USED_BIT << EPOCH_2_SHIFT)
38 #define METHOD_USED_EPOCH_1_BIT (METHOD_USED_BIT << EPOCH_1_SHIFT)
39 #define METHOD_USED_EPOCH_2_BIT (METHOD_USED_BIT << EPOCH_2_SHIFT)
40 #define METHOD_AND_CLASS_IN_USE_BITS (METHOD_USED_BIT | USED_BIT)
41 #define METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_1_SHIFT)
42 #define METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_2_SHIFT)
43
44 class JfrTraceIdEpoch : AllStatic {
45 friend class JfrCheckpointManager;
46 private:
47 static bool _epoch_state;
48 static bool volatile _tag_state;
49
50 static void shift_epoch();
74 return _epoch_state ? USED_EPOCH_1_BIT : USED_EPOCH_2_BIT;
75 }
76
77 static traceid method_in_use_this_epoch_bit() {
78 return _epoch_state ? METHOD_USED_EPOCH_2_BIT : METHOD_USED_EPOCH_1_BIT;
79 }
80
81 static traceid method_in_use_prev_epoch_bit() {
82 return _epoch_state ? METHOD_USED_EPOCH_1_BIT : METHOD_USED_EPOCH_2_BIT;
83 }
84
85 static traceid method_and_class_in_use_this_epoch_bits() {
86 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS;
87 }
88
89 static traceid method_and_class_in_use_prev_epoch_bits() {
90 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS;
91 }
92
93 static bool has_changed_tag_state() {
94 if (OrderAccess::load_acquire(&_tag_state)) {
95 OrderAccess::release_store(&_tag_state, false);
96 return true;
97 }
98 return false;
99 }
100
101 static void set_changed_tag_state() {
102 if (!OrderAccess::load_acquire(&_tag_state)) {
103 OrderAccess::release_store(&_tag_state, true);
104 }
105 }
106 };
107
108 #endif // SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
26 #define SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
27
28 #include "jfr/utilities/jfrTypes.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/atomic.hpp"
31
32 #define USED_BIT 1
33 #define METHOD_USED_BIT (USED_BIT << 2)
34 #define EPOCH_1_SHIFT 0
35 #define EPOCH_2_SHIFT 1
36 #define USED_EPOCH_1_BIT (USED_BIT << EPOCH_1_SHIFT)
37 #define USED_EPOCH_2_BIT (USED_BIT << EPOCH_2_SHIFT)
38 #define METHOD_USED_EPOCH_1_BIT (METHOD_USED_BIT << EPOCH_1_SHIFT)
39 #define METHOD_USED_EPOCH_2_BIT (METHOD_USED_BIT << EPOCH_2_SHIFT)
40 #define METHOD_AND_CLASS_IN_USE_BITS (METHOD_USED_BIT | USED_BIT)
41 #define METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_1_SHIFT)
42 #define METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_2_SHIFT)
43
44 class JfrTraceIdEpoch : AllStatic {
45 friend class JfrCheckpointManager;
46 private:
47 static bool _epoch_state;
48 static bool volatile _tag_state;
49
50 static void shift_epoch();
74 return _epoch_state ? USED_EPOCH_1_BIT : USED_EPOCH_2_BIT;
75 }
76
77 static traceid method_in_use_this_epoch_bit() {
78 return _epoch_state ? METHOD_USED_EPOCH_2_BIT : METHOD_USED_EPOCH_1_BIT;
79 }
80
81 static traceid method_in_use_prev_epoch_bit() {
82 return _epoch_state ? METHOD_USED_EPOCH_1_BIT : METHOD_USED_EPOCH_2_BIT;
83 }
84
85 static traceid method_and_class_in_use_this_epoch_bits() {
86 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS;
87 }
88
89 static traceid method_and_class_in_use_prev_epoch_bits() {
90 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS;
91 }
92
93 static bool has_changed_tag_state() {
94 if (Atomic::load_acquire(&_tag_state)) {
95 Atomic::release_store(&_tag_state, false);
96 return true;
97 }
98 return false;
99 }
100
101 static void set_changed_tag_state() {
102 if (!Atomic::load_acquire(&_tag_state)) {
103 Atomic::release_store(&_tag_state, true);
104 }
105 }
106 };
107
108 #endif // SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
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