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gh-125196: Use PyUnicodeWriter for repr(dict) #125270

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Oct 10, 2024
Merged

gh-125196: Use PyUnicodeWriter for repr(dict) #125270

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72 changes: 36 additions & 36 deletions Objects/dictobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3196,83 +3196,83 @@ static PyObject *
dict_repr_lock_held(PyObject *self)
{
PyDictObject *mp = (PyDictObject *)self;
Py_ssize_t i;
PyObject *key = NULL, *value = NULL;
_PyUnicodeWriter writer;
int first;

ASSERT_DICT_LOCKED(mp);

i = Py_ReprEnter((PyObject *)mp);
if (i != 0) {
return i > 0 ? PyUnicode_FromString("{...}") : NULL;
int res = Py_ReprEnter((PyObject *)mp);
if (res != 0) {
return (res > 0 ? PyUnicode_FromString("{...}") : NULL);
}

if (mp->ma_used == 0) {
Py_ReprLeave((PyObject *)mp);
return PyUnicode_FromString("{}");
}

_PyUnicodeWriter_Init(&writer);
writer.overallocate = 1;
/* "{" + "1: 2" + ", 3: 4" * (len - 1) + "}" */
writer.min_length = 1 + 4 + (2 + 4) * (mp->ma_used - 1) + 1;
// "{" + "1: 2" + ", 3: 4" * (len - 1) + "}"
Py_ssize_t prealloc = 1 + 4 + 6 * (mp->ma_used - 1) + 1;
PyUnicodeWriter *writer = PyUnicodeWriter_Create(prealloc);
if (writer == NULL) {
goto error;
}

if (_PyUnicodeWriter_WriteChar(&writer, '{') < 0)
if (PyUnicodeWriter_WriteChar(writer, '{') < 0) {
goto error;
}

/* Do repr() on each key+value pair, and insert ": " between them.
Note that repr may mutate the dict. */
i = 0;
first = 1;
Py_ssize_t i = 0;
int first = 1;
while (_PyDict_Next((PyObject *)mp, &i, &key, &value, NULL)) {
PyObject *s;
int res;

/* Prevent repr from deleting key or value during key format. */
// Prevent repr from deleting key or value during key format.
Py_INCREF(key);
Py_INCREF(value);

if (!first) {
if (_PyUnicodeWriter_WriteASCIIString(&writer, ", ", 2) < 0)
// Write ", "
if (PyUnicodeWriter_WriteChar(writer, ',') < 0) {
goto error;
}
if (PyUnicodeWriter_WriteChar(writer, ' ') < 0) {
goto error;
}
}
first = 0;

s = PyObject_Repr(key);
if (s == NULL)
goto error;
res = _PyUnicodeWriter_WriteStr(&writer, s);
Py_DECREF(s);
if (res < 0)
// Write repr(key)
if (PyUnicodeWriter_WriteRepr(writer, key) < 0) {
goto error;
}

if (_PyUnicodeWriter_WriteASCIIString(&writer, ": ", 2) < 0)
// Write ": "
if (PyUnicodeWriter_WriteChar(writer, ':') < 0) {
goto error;

s = PyObject_Repr(value);
if (s == NULL)
}
if (PyUnicodeWriter_WriteChar(writer, ' ') < 0) {
goto error;
res = _PyUnicodeWriter_WriteStr(&writer, s);
Py_DECREF(s);
if (res < 0)
}

// Write repr(value)
if (PyUnicodeWriter_WriteRepr(writer, value) < 0) {
goto error;
}

Py_CLEAR(key);
Py_CLEAR(value);
}

writer.overallocate = 0;
if (_PyUnicodeWriter_WriteChar(&writer, '}') < 0)
if (PyUnicodeWriter_WriteChar(writer, '}') < 0) {
goto error;
}

Py_ReprLeave((PyObject *)mp);

return _PyUnicodeWriter_Finish(&writer);
return PyUnicodeWriter_Finish(writer);

error:
Py_ReprLeave((PyObject *)mp);
_PyUnicodeWriter_Dealloc(&writer);
PyUnicodeWriter_Discard(writer);
Py_XDECREF(key);
Py_XDECREF(value);
return NULL;
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