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gh-125196: Use PyUnicodeWriter for repr(list) #125202

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Merged
merged 5 commits into from
Oct 9, 2024
Merged

gh-125196: Use PyUnicodeWriter for repr(list) #125202

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8c33f91
gh-125196: Use PyUnicodeWriter for repr(list)
vstinner Oct 9, 2024
5fa3466
Fix error handling
vstinner Oct 9, 2024
0273017
Avoid PyUnicodeWriter_WriteUTF8()
vstinner Oct 9, 2024
8b33b0e
PyUnicodeWriter_Discard(NULL) does nothing
vstinner Oct 9, 2024
9c910b5
Revert "PyUnicodeWriter_Discard(NULL) does nothing"
vstinner Oct 9, 2024
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9 changes: 5 additions & 4 deletions Objects/listobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -542,7 +542,10 @@ list_repr_impl(PyListObject *v)
so must refetch the list size on each iteration. */
for (Py_ssize_t i = 0; i < Py_SIZE(v); ++i) {
if (i > 0) {
if (PyUnicodeWriter_WriteUTF8(writer, ", ", 2) < 0) {
if (PyUnicodeWriter_WriteChar(writer, ',') < 0) {
goto error;
}
if (PyUnicodeWriter_WriteChar(writer, ' ') < 0) {
goto error;
}
}
Expand All @@ -560,9 +563,7 @@ list_repr_impl(PyListObject *v)
return PyUnicodeWriter_Finish(writer);

error:
if (writer != NULL) {
PyUnicodeWriter_Discard(writer);
}
PyUnicodeWriter_Discard(writer);
Py_ReprLeave((PyObject *)v);
return NULL;
}
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3 changes: 3 additions & 0 deletions Objects/unicodeobject.c
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Expand Up @@ -13428,6 +13428,9 @@ PyUnicodeWriter_Create(Py_ssize_t length)

void PyUnicodeWriter_Discard(PyUnicodeWriter *writer)
{
if (writer == NULL) {
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This should be documented. Please do this in a separate PR.

Also, I think it is worth to try to optimize PyUnicodeWriter_WriteUTF8() for short ASCII strings.

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This should be documented. Please do this in a separate PR.

Oh ok. I reverted the change.

return;
}
_PyUnicodeWriter_Dealloc((_PyUnicodeWriter*)writer);
PyMem_Free(writer);
}
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