bpo-39489: Remove COUNT_ALLOCS special build (GH-18259)

Remove:

* COUNT_ALLOCS macro
* sys.getcounts() function
* SHOW_ALLOC_COUNT code in listobject.c
* SHOW_TRACK_COUNT code in tupleobject.c
* PyConfig.show_alloc_count field
* -X showalloccount command line option
* @test.support.requires_type_collecting decorator

3 files changed, 2 insertions, 30 deletions

diff --git a/Include/cpython/initconfig.h b/Include/cpython/initconfig.h
index 54e6623..c5fa2b3 100644
--- a/Include/cpython/initconfig.h
+++ b/Include/cpython/initconfig.h
@@ -153,7 +153,6 @@ typedef struct {
 
     int import_time;        /* PYTHONPROFILEIMPORTTIME, -X importtime */
     int show_ref_count;     /* -X showrefcount */
-    int show_alloc_count;   /* -X showalloccount */
     int dump_refs;          /* PYTHONDUMPREFS */
     int malloc_stats;       /* PYTHONMALLOCSTATS */
 
diff --git a/Include/cpython/object.h b/Include/cpython/object.h
index dc8fd6f..5fcad55 100644
--- a/Include/cpython/object.h
+++ b/Include/cpython/object.h
@@ -255,15 +255,6 @@ typedef struct _typeobject {
 
     destructor tp_finalize;
     vectorcallfunc tp_vectorcall;
-
-#ifdef COUNT_ALLOCS
-    /* these must be last and never explicitly initialized */
-    Py_ssize_t tp_allocs;
-    Py_ssize_t tp_frees;
-    Py_ssize_t tp_maxalloc;
-    struct _typeobject *tp_prev;
-    struct _typeobject *tp_next;
-#endif
 } PyTypeObject;
 
 /* The *real* layout of a type object when allocated on the heap */
@@ -341,8 +332,6 @@ static inline void _Py_Dealloc_inline(PyObject *op)
     destructor dealloc = Py_TYPE(op)->tp_dealloc;
 #ifdef Py_TRACE_REFS
     _Py_ForgetReference(op);
-#else
-    _Py_INC_TPFREES(op);
 #endif
     (*dealloc)(op);
 }
diff --git a/Include/object.h b/Include/object.h
index 7a5f573..1a2e704 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -405,20 +405,6 @@ PyAPI_FUNC(void) _PyDebug_PrintTotalRefs(void);
 #define _Py_DEC_REFTOTAL
 #endif /* Py_REF_DEBUG */
 
-#ifdef COUNT_ALLOCS
-PyAPI_FUNC(void) _Py_inc_count(struct _typeobject *);
-PyAPI_FUNC(void) _Py_dec_count(struct _typeobject *);
-#define _Py_INC_TPALLOCS(OP)    _Py_inc_count(Py_TYPE(OP))
-#define _Py_INC_TPFREES(OP)     _Py_dec_count(Py_TYPE(OP))
-#define _Py_DEC_TPFREES(OP)     Py_TYPE(OP)->tp_frees--
-#define _Py_COUNT_ALLOCS_COMMA  ,
-#else
-#define _Py_INC_TPALLOCS(OP)
-#define _Py_INC_TPFREES(OP)
-#define _Py_DEC_TPFREES(OP)
-#define _Py_COUNT_ALLOCS_COMMA
-#endif /* COUNT_ALLOCS */
-
 /* Update the Python traceback of an object. This function must be called
    when a memory block is reused from a free list. */
 PyAPI_FUNC(int) _PyTraceMalloc_NewReference(PyObject *op);
@@ -438,15 +424,13 @@ static inline void _Py_NewReference(PyObject *op)
     if (_Py_tracemalloc_config.tracing) {
         _PyTraceMalloc_NewReference(op);
     }
-    _Py_INC_TPALLOCS(op);
     _Py_INC_REFTOTAL;
     Py_REFCNT(op) = 1;
 }
 
-static inline void _Py_ForgetReference(PyObject *op)
+static inline void _Py_ForgetReference(PyObject *Py_UNUSED(op))
 {
-    (void)op; /* may be unused, shut up -Wunused-parameter */
-    _Py_INC_TPFREES(op);
+    /* nothing to do */
 }
 #endif /* !Py_TRACE_REFS */