pythonGH-126547: Pre-assign version numbers for a few common classes (pythonGH-126551)

Author: markshannon

Include/internal/pycore_runtime_init.h

@@ -87,7 +87,7 @@ extern PyTypeObject _PyExc_MemoryError;
             .double_format = _py_float_format_unknown, \
         }, \
         .types = { \
-            .next_version_tag = 1, \
+            .next_version_tag = _Py_TYPE_VERSION_NEXT, \
         }, \
         .static_objects = { \
             .singletons = { \

Include/internal/pycore_typeobject.h

@@ -14,6 +14,21 @@ extern "C" {
 
 /* state */
 
+#define _Py_TYPE_VERSION_INT 1
+#define _Py_TYPE_VERSION_FLOAT 2
+#define _Py_TYPE_VERSION_LIST 3
+#define _Py_TYPE_VERSION_TUPLE 4
+#define _Py_TYPE_VERSION_STR 5
+#define _Py_TYPE_VERSION_SET 6
+#define _Py_TYPE_VERSION_FROZEN_SET 7
+#define _Py_TYPE_VERSION_DICT 8
+#define _Py_TYPE_VERSION_BYTEARRAY 9
+#define _Py_TYPE_VERSION_BYTES 10
+#define _Py_TYPE_VERSION_COMPLEX 11
+
+#define _Py_TYPE_VERSION_NEXT 16
+
+
 #define _Py_TYPE_BASE_VERSION_TAG (2<<16)
 #define _Py_MAX_GLOBAL_TYPE_VERSION_TAG (_Py_TYPE_BASE_VERSION_TAG - 1)
 

Objects/bytearrayobject.c

@@ -2452,6 +2452,7 @@ PyTypeObject PyByteArray_Type = {
     PyType_GenericAlloc,                /* tp_alloc */
     PyType_GenericNew,                  /* tp_new */
     PyObject_Free,                      /* tp_free */
+    .tp_version_tag = _Py_TYPE_VERSION_BYTEARRAY,
 };
 
 /*********************** Bytearray Iterator ****************************/

Objects/bytesobject.c

@@ -3080,6 +3080,7 @@ PyTypeObject PyBytes_Type = {
     bytes_alloc,                                /* tp_alloc */
     bytes_new,                                  /* tp_new */
     PyObject_Free,                              /* tp_free */
+    .tp_version_tag = _Py_TYPE_VERSION_BYTES,
 };
 
 void

Objects/complexobject.c

@@ -1250,4 +1250,5 @@ PyTypeObject PyComplex_Type = {
     PyType_GenericAlloc,                        /* tp_alloc */
     actual_complex_new,                         /* tp_new */
     PyObject_Free,                              /* tp_free */
+    .tp_version_tag = _Py_TYPE_VERSION_COMPLEX,
 };

Objects/dictobject.c

@@ -4912,6 +4912,7 @@ PyTypeObject PyDict_Type = {
     dict_new,                                   /* tp_new */
     PyObject_GC_Del,                            /* tp_free */
     .tp_vectorcall = dict_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_DICT,
 };
 
 /* For backward compatibility with old dictionary interface */

Objects/floatobject.c

@@ -1916,6 +1916,7 @@ PyTypeObject PyFloat_Type = {
     0,                                          /* tp_alloc */
     float_new,                                  /* tp_new */
     .tp_vectorcall = (vectorcallfunc)float_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_FLOAT,
 };
 
 static void

Objects/listobject.c

@@ -3774,6 +3774,7 @@ PyTypeObject PyList_Type = {
     PyType_GenericNew,                          /* tp_new */
     PyObject_GC_Del,                            /* tp_free */
     .tp_vectorcall = list_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_LIST,
 };
 
 /*********************** List Iterator **************************/

Objects/longobject.c

@@ -6584,6 +6584,7 @@ PyTypeObject PyLong_Type = {
     long_new,                                   /* tp_new */
     PyObject_Free,                              /* tp_free */
     .tp_vectorcall = long_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_INT,
 };
 
 static PyTypeObject Int_InfoType;

Objects/setobject.c

@@ -2520,6 +2520,7 @@ PyTypeObject PySet_Type = {
     set_new,                            /* tp_new */
     PyObject_GC_Del,                    /* tp_free */
     .tp_vectorcall = set_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_SET,
 };
 
 /* frozenset object ********************************************************/
@@ -2610,6 +2611,7 @@ PyTypeObject PyFrozenSet_Type = {
     frozenset_new,                      /* tp_new */
     PyObject_GC_Del,                    /* tp_free */
     .tp_vectorcall = frozenset_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_FROZEN_SET,
 };
 
 

Objects/tupleobject.c

@@ -909,6 +909,7 @@ PyTypeObject PyTuple_Type = {
     tuple_new,                                  /* tp_new */
     PyObject_GC_Del,                            /* tp_free */
     .tp_vectorcall = tuple_vectorcall,
+    .tp_version_tag = _Py_TYPE_VERSION_TUPLE,
 };
 
 /* The following function breaks the notion that tuples are immutable:

Objects/typeobject.c

@@ -8613,7 +8613,9 @@ init_static_type(PyInterpreterState *interp, PyTypeObject *self,
         self->tp_flags |= Py_TPFLAGS_IMMUTABLETYPE;
 
         assert(NEXT_GLOBAL_VERSION_TAG <= _Py_MAX_GLOBAL_TYPE_VERSION_TAG);
-        _PyType_SetVersion(self, NEXT_GLOBAL_VERSION_TAG++);
+        if (self->tp_version_tag == 0) {
+            _PyType_SetVersion(self, NEXT_GLOBAL_VERSION_TAG++);
+        }
     }
     else {
         assert(!initial);