8000 gh-91146: More reduce allocation size of list from str.split/rsplit by corona10 · Pull Request #95493 · python/cpython · GitHub
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gh-91146: More reduce allocation size of list from str.split/rsplit #95493

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Merged
merged 6 commits into from
Aug 1, 2022
Merged

gh-91146: More reduce allocation size of list from str.split/rsplit #95493

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48ad552
gh-91146: More reduce allocation size of list from str.split/rsplit
corona10 Jul 31, 2022
605e0cf
Update NEWS.d
corona10 Jul 31, 2022
cab2a61
Handle devide by zero
corona10 Jul 31, 2022
2ebc918
Add comment for len2 == 0
corona10 Jul 31, 2022
b5edcd8
Avoid overflow error
corona10 Jul 31, 2022
7f248ef
Handle overflow case
corona10 Jul 31, 2022
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2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Core and Builtins/2022-07-31-03-22-58.gh-issue-91146.Y2Hziy.rst
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
Reduce allocation size of :class:`list` from :meth:`str.split`
and :meth:`str.rsplit`. Patch by Dong-hee Na.
and :meth:`str.rsplit`. Patch by Dong-hee Na and Inada Naoki.
31 changes: 22 additions & 9 deletions Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9698,11 +9698,11 @@ split(PyObject *self,
PyObject* out;
len1 = PyUnicode_GET_LENGTH(self);
kind1 = PyUnicode_KIND(self);
if (maxcount < 0) {
maxcount = len1;
}

if (substring == NULL)
if (substring == NULL) {
if (maxcount < 0) {
maxcount = (len1 - 1) / 2 + 1;
}
switch (kind1) {
case PyUnicode_1BYTE_KIND:
if (PyUnicode_IS_ASCII(self))
Expand All @@ -9728,9 +9728,16 @@ split(PyObject *self,
default:
Py_UNREACHABLE();
}
}

kind2 = PyUnicode_KIND(substring);
len2 = PyUnicode_GET_LENGTH(substring);
if (maxcount < 0) {
// if len2 == 0, it will raise ValueError.
maxcount = len2 == 0 ? 0 : (len1 / len2) + 1;
// handle expected overflow case: (Py_SSIZE_T_MAX / 1) + 1
maxcount = maxcount < 0 ? len1 : maxcount;
}
if (kind1 < kind2 || len1 < len2) {
out = PyList_New(1);
if (out == NULL)
Expand Down Expand Up @@ -9785,11 +9792,11 @@ rsplit(PyObject *self,

len1 = PyUnicode_GET_LENGTH(self);
kind1 = PyUnicode_KIND(self);
if (maxcount < 0) {
maxcount = len1;
}

if (substring == NULL)
if (substring == NULL) {
if (maxcount < 0) {
maxcount = (len1 - 1) / 2 + 1;
}
switch (kind1) {
case PyUnicode_1BYTE_KIND:
if (PyUnicode_IS_ASCII(self))
Expand All @@ -9815,9 +9822,15 @@ rsplit(PyObject *self,
default:
Py_UNREACHABLE();
}

}
kind2 = PyUnicode_KIND(substring);
len2 = PyUnicode_GET_LENGTH(substring);
if (maxcount < 0) {
// if len2 == 0, it will raise ValueError.
maxcount = len2 == 0 ? 0 : (len1 / len2) + 1;
// handle expected overflow case: (Py_SSIZE_T_MAX / 1) + 1
maxcount = maxcount < 0 ? len1 : maxcount;
}
if (kind1 < kind2 || len1 < len2) {
out = PyList_New(1);
if (out == NULL)
Expand Down
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