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 // Statistics on Python performance.
 //
 // API:
 //
 // - _Py_INCREF_STAT_INC() and _Py_DECREF_STAT_INC() used by Py_INCREF()
 //   and Py_DECREF().
 // - _Py_stats variable
 //
 // Functions of the sys module:
 //
 // - sys._stats_on()
 // - sys._stats_off()
 // - sys._stats_clear()
 // - sys._stats_dump()
 //
 // Python must be built with ./configure --enable-pystats to define the
 // Py_STATS macro.
 //
 // Define _PY_INTERPRETER macro to increment interpreter_increfs and
 // interpreter_decrefs. Otherwise, increment increfs and decrefs.
 //
 // The number of incref operations counted by `incref` and
 // `interpreter_incref` is the number of increment operations, which is
 // not equal to the total of all reference counts. A single increment
 // operation may increase the reference count of an object by more than
 // one. For example, see `_Py_RefcntAdd`.
 
 #ifndef Py_CPYTHON_PYSTATS_H
 #  error "this header file must not be included directly"
 #endif
 
 #define PYSTATS_MAX_UOP_ID 512
 
 #define SPECIALIZATION_FAILURE_KINDS 36
 
 /* Stats for determining who is calling PyEval_EvalFrame */
 #define EVAL_CALL_TOTAL 0
 #define EVAL_CALL_VECTOR 1
 #define EVAL_CALL_GENERATOR 2
 #define EVAL_CALL_LEGACY 3
 #define EVAL_CALL_FUNCTION_VECTORCALL 4
 #define EVAL_CALL_BUILD_CLASS 5
 #define EVAL_CALL_SLOT 6
 #define EVAL_CALL_FUNCTION_EX 7
 #define EVAL_CALL_API 8
 #define EVAL_CALL_METHOD 9
 
 #define EVAL_CALL_KINDS 10
 
 typedef struct _specialization_stats {
     uint64_t success;
     uint64_t failure;
     uint64_t hit;
     uint64_t deferred;
     uint64_t miss;
     uint64_t deopt;
     uint64_t failure_kinds[SPECIALIZATION_FAILURE_KINDS];
 } SpecializationStats;
 
 typedef struct _opcode_stats {
     SpecializationStats specialization;
     uint64_t execution_count;
     uint64_t pair_count[256];
 } OpcodeStats;
 
 typedef struct _call_stats {
     uint64_t inlined_py_calls;
     uint64_t pyeval_calls;
     uint64_t frames_pushed;
     uint64_t frame_objects_created;
     uint64_t eval_calls[EVAL_CALL_KINDS];
 } CallStats;
 
 typedef struct _object_stats {
     uint64_t increfs;
     uint64_t decrefs;
     uint64_t interpreter_increfs;
     uint64_t interpreter_decrefs;
     uint64_t allocations;
     uint64_t allocations512;
     uint64_t allocations4k;
     uint64_t allocations_big;
     uint64_t frees;
     uint64_t to_freelist;
     uint64_t from_freelist;
     uint64_t inline_values;
     uint64_t dict_materialized_on_request;
     uint64_t dict_materialized_new_key;
     uint64_t dict_materialized_too_big;
     uint64_t dict_materialized_str_subclass;
     uint64_t type_cache_hits;
     uint64_t type_cache_misses;
     uint64_t type_cache_dunder_hits;
     uint64_t type_cache_dunder_misses;
     uint64_t type_cache_collisions;
     /* Temporary value used during GC */
     uint64_t object_visits;
 } ObjectStats;
 
 typedef struct _gc_stats {
     uint64_t collections;
     uint64_t object_visits;
     uint64_t objects_collected;
 } GCStats;
 
 typedef struct _uop_stats {
     uint64_t execution_count;
     uint64_t miss;
     uint64_t pair_count[PYSTATS_MAX_UOP_ID + 1];
 } UOpStats;
 
 #define _Py_UOP_HIST_SIZE 32
 
 typedef struct _optimization_stats {
     uint64_t attempts;
     uint64_t traces_created;
     uint64_t traces_executed;
     uint64_t uops_executed;
     uint64_t trace_stack_overflow;
     uint64_t trace_stack_underflow;
     uint64_t trace_too_long;
     uint64_t trace_too_short;
     uint64_t inner_loop;
     uint64_t recursive_call;
     uint64_t low_confidence;
     uint64_t executors_invalidated;
     UOpStats opcode[PYSTATS_MAX_UOP_ID + 1];
     uint64_t unsupported_opcode[256];
     uint64_t trace_length_hist[_Py_UOP_HIST_SIZE];
     uint64_t trace_run_length_hist[_Py_UOP_HIST_SIZE];
     uint64_t optimized_trace_length_hist[_Py_UOP_HIST_SIZE];
     uint64_t optimizer_attempts;
     uint64_t optimizer_successes;
     uint64_t optimizer_failure_reason_no_memory;
     uint64_t remove_globals_builtins_changed;
     uint64_t remove_globals_incorrect_keys;
     uint64_t error_in_opcode[PYSTATS_MAX_UOP_ID + 1];
 } OptimizationStats;
 
 typedef struct _rare_event_stats {
     /* Setting an object's class, obj.__class__ = ... */
     uint64_t set_class;
     /* Setting the bases of a class, cls.__bases__ = ... */
     uint64_t set_bases;
     /* Setting the PEP 523 frame eval function, _PyInterpreterState_SetFrameEvalFunc() */
     uint64_t set_eval_frame_func;
     /* Modifying the builtins,  __builtins__.__dict__[var] = ... */
     uint64_t builtin_dict;
     /* Modifying a function, e.g. func.__defaults__ = ..., etc. */
     uint64_t func_modification;
     /* Modifying a dict that is being watched */
     uint64_t watched_dict_modification;
     uint64_t watched_globals_modification;
 } RareEventStats;
 
 typedef struct _stats {
     OpcodeStats opcode_stats[256];
     CallStats call_stats;
     ObjectStats object_stats;
     OptimizationStats optimization_stats;
     RareEventStats rare_event_stats;
     GCStats *gc_stats;
 } PyStats;
 
 
 // Export for shared extensions like 'math'
 PyAPI_DATA(PyStats*) _Py_stats;
 
 #ifdef _PY_INTERPRETER
 #  define _Py_INCREF_STAT_INC() do { if (_Py_stats) _Py_stats->object_stats.interpreter_increfs++; } while (0)
 #  define _Py_DECREF_STAT_INC() do { if (_Py_stats) _Py_stats->object_stats.interpreter_decrefs++; } while (0)
 #else
 #  define _Py_INCREF_STAT_INC() do { if (_Py_stats) _Py_stats->object_stats.increfs++; } while (0)
 #  define _Py_DECREF_STAT_INC() do { if (_Py_stats) _Py_stats->object_stats.decrefs++; } while (0)
 #endif

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