21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP
26 #define SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/handles.hpp"
30 #include "utilities/exceptions.hpp"
31
32 // InvocationCounters are used to trigger actions when a limit (threshold) is reached.
33 // For different states, different limits and actions can be defined in the initialization
34 // routine of InvocationCounters.
35 //
36 // Implementation notes: For space reasons, state & counter are both encoded in one word,
37 // The state is encoded using some of the least significant bits, the counter is using the
38 // more significant bits. The counter is incremented before a method is activated and an
39 // action is triggered when count() > limit().
40
41 class InvocationCounter VALUE_OBJ_CLASS_SPEC {
42 friend class VMStructs;
43 friend class JVMCIVMStructs;
44 friend class ciReplay;
45 private: // bit no: |31 3| 2 | 1 0 |
46 unsigned int _counter; // format: [count|carry|state]
47
48 enum PrivateConstants {
49 number_of_state_bits = 2,
50 number_of_carry_bits = 1,
51 number_of_noncount_bits = number_of_state_bits + number_of_carry_bits,
52 state_limit = nth_bit(number_of_state_bits),
53 count_grain = nth_bit(number_of_state_bits + number_of_carry_bits),
54 carry_mask = right_n_bits(number_of_carry_bits) << number_of_state_bits,
55 state_mask = right_n_bits(number_of_state_bits),
56 status_mask = right_n_bits(number_of_state_bits + number_of_carry_bits),
57 count_mask = ((int)(-1) ^ status_mask)
58 };
59
60 public:
61 static int InterpreterInvocationLimit; // CompileThreshold scaled for interpreter use
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21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP
26 #define SHARE_VM_INTERPRETER_INVOCATIONCOUNTER_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/handles.hpp"
30 #include "utilities/exceptions.hpp"
31
32 // InvocationCounters are used to trigger actions when a limit (threshold) is reached.
33 // For different states, different limits and actions can be defined in the initialization
34 // routine of InvocationCounters.
35 //
36 // Implementation notes: For space reasons, state & counter are both encoded in one word,
37 // The state is encoded using some of the least significant bits, the counter is using the
38 // more significant bits. The counter is incremented before a method is activated and an
39 // action is triggered when count() > limit().
40
41 class InvocationCounter {
42 friend class VMStructs;
43 friend class JVMCIVMStructs;
44 friend class ciReplay;
45 private: // bit no: |31 3| 2 | 1 0 |
46 unsigned int _counter; // format: [count|carry|state]
47
48 enum PrivateConstants {
49 number_of_state_bits = 2,
50 number_of_carry_bits = 1,
51 number_of_noncount_bits = number_of_state_bits + number_of_carry_bits,
52 state_limit = nth_bit(number_of_state_bits),
53 count_grain = nth_bit(number_of_state_bits + number_of_carry_bits),
54 carry_mask = right_n_bits(number_of_carry_bits) << number_of_state_bits,
55 state_mask = right_n_bits(number_of_state_bits),
56 status_mask = right_n_bits(number_of_state_bits + number_of_carry_bits),
57 count_mask = ((int)(-1) ^ status_mask)
58 };
59
60 public:
61 static int InterpreterInvocationLimit; // CompileThreshold scaled for interpreter use
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