Commite6091f8

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gh-81381: Reduce allcoated size of PyType_GenericAlloc if possible

1 parent11f9932 commite6091f8Copy full SHA for e6091f8

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-4

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-4

lines changed

Lines changed: 2 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Reduce the extra allocation size of:c:func:`PyType_GenericAlloc` except the
	`2`	`+type is if a subtype of 'type'.`

Lines changed: 7 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -1289,9 +1289,12 @@ PyObject *`
`1289`	`1289`	`_PyType_AllocNoTrack(PyTypeObject*type,Py_ssize_tnitems)`
`1290`	`1290`	`{`
`1291`	`1291`	`PyObject*obj;`
`1292`		`-constsize_tsize=_PyObject_VAR_SIZE(type,nitems+1);`
`1293`		`-/* note that we need to add one, for the sentinel */`
`1294`		`-`
	`1292`	`+size_textra=0;`
	`1293`	`+if (type->tp_flags&Py_TPFLAGS_TYPE_SUBCLASS\|\|type->tp_flags&Py_TPFLAGS_HAVE_VECTORCALL) {`
	`1294`	`+/* note that we need to add one, for the sentinel */`
	`1295`	`+extra=1;`
	`1296`	`+ }`
	`1297`	`+constsize_tsize=_PyObject_VAR_SIZE(type,nitems+extra);`
`1295`	`1298`	`constsize_tpresize=_PyType_PreHeaderSize(type);`
`1296`	`1299`	`char*alloc=PyObject_Malloc(size+presize);`
`1297`	`1300`	`if (alloc==NULL) {`
`@@ -1309,7 +1312,7 @@ _PyType_AllocNoTrack(PyTypeObject *type, Py_ssize_t nitems)`
`1309`	`1312`	`_PyObject_Init(obj,type);`
`1310`	`1313`	`}`
`1311`	`1314`	`else {`
`1312`		`-_PyObject_InitVar((PyVarObject*)obj,type,nitems);`
	`1315`	`+_PyObject_InitVar((PyVarObject*)obj,type,nitems+extra);`
`1313`	`1316`	`}`
`1314`	`1317`	`returnobj;`
`1315`	`1318`	`}`

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