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bpo-1635741: Enhance _datetime error handling #23139

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Merged
merged 4 commits into from
Nov 20, 2020
Merged

bpo-1635741: Enhance _datetime error handling #23139

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eb65e29
refactoring before multi-phase init
koubaa Nov 4, 2020
22025f9
code review
koubaa Nov 7, 2020
ae49eaf
fix macro & other PR suggestions
koubaa Nov 15, 2020
0daff77
pr comments
koubaa Nov 20, 2020
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220 changes: 103 additions & 117 deletions Modules/_datetimemodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6494,32 +6494,9 @@ static PyDateTime_CAPI CAPI = {
new_time_ex2
};



static struct PyModuleDef datetimemodule = {
PyModuleDef_HEAD_INIT,
"_datetime",
"Fast implementation of the datetime type.",
-1,
module_methods,
NULL,
NULL,
NULL,
NULL
};

PyMODINIT_FUNC
PyInit__datetime(void)
static int
_datetime_exec(PyObject *module)
{
PyObject *m; /* a module object */
PyObject *d; /* its dict */
PyObject *x;
PyObject *delta;

m = PyModule_Create(&datetimemodule);
if (m == NULL)
return NULL;

// `&...` is not a constant expression according to a strict reading
// of C standards. Fill tp_base at run-time rather than statically.
// See https://bugs.python.org/issue40777
Expand All @@ -6537,136 +6514,120 @@ PyInit__datetime(void)
};

for (size_t i = 0; i < Py_ARRAY_LENGTH(types); i++) {
if (PyModule_AddType(m, types[i]) < 0) {
return NULL;
if (PyModule_AddType(module, types[i]) < 0) {
return -1;
}
}

if (PyType_Ready(&PyDateTime_IsoCalendarDateType) < 0) {
return NULL;
return -1;
}
Py_INCREF(&PyDateTime_IsoCalendarDateType);

/* timedelta values */
d = PyDateTime_DeltaType.tp_dict;

x = new_delta(0, 0, 1, 0);
if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
return NULL;
Py_DECREF(x);

x = new_delta(-MAX_DELTA_DAYS, 0, 0, 0);
if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
return NULL;
Py_DECREF(x);
#define DATETIME_ADD_MACRO(dict, c, value_expr) \
do { \
PyObject *value = (value_expr); \
if (value == NULL) { \
return -1; \
} \
if (PyDict_SetItemString(dict, c, value) < 0) { \
Py_DECREF(value); \
return -1; \
} \
Py_DECREF(value); \
} while(0)

x = new_delta(MAX_DELTA_DAYS, 24*3600-1, 1000000-1, 0);
if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
return NULL;
Py_DECREF(x);
/* timedelta values */
PyObject *d = PyDateTime_DeltaType.tp_dict;
DATETIME_ADD_MACRO(d, "resolution", new_delta(0, 0, 1, 0));
DATETIME_ADD_MACRO(d, "min", new_delta(-MAX_DELTA_DAYS, 0, 0, 0));
DATETIME_ADD_MACRO(d, "max",
new_delta(MAX_DELTA_DAYS, 24*3600-1, 1000000-1, 0));

/* date values */
d = PyDateTime_DateType.tp_dict;

x = new_date(1, 1, 1);
if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
return NULL;
Py_DECREF(x);

x = new_date(MAXYEAR, 12, 31);
if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
return NULL;
Py_DECREF(x);

x = new_delta(1, 0, 0, 0);
if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
return NULL;
Py_DECREF(x);
DATETIME_ADD_MACRO(d, "min", new_date(1, 1, 1));
DATETIME_ADD_MACRO(d, "max", new_date(MAXYEAR, 12, 31));
DATETIME_ADD_MACRO(d, "resolution", new_delta(1, 0, 0, 0));

/* time values */
d = PyDateTime_TimeType.tp_dict;

x = new_time(0, 0, 0, 0, Py_None, 0);
if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
return NULL;
Py_DECREF(x);

x = new_time(23, 59, 59, 999999, Py_None, 0);
if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
return NULL;
Py_DECREF(x);

x = new_delta(0, 0, 1, 0);
if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
return NULL;
Py_DECREF(x);
DATETIME_ADD_MACRO(d, "min", new_time(0, 0, 0, 0, Py_None, 0));
DATETIME_ADD_MACRO(d, "max", new_time(23, 59, 59, 999999, Py_None, 0));
DATETIME_ADD_MACRO(d, "resolution", new_delta(0, 0, 1, 0));

/* datetime values */
d = PyDateTime_DateTimeType.tp_dict;

x = new_datetime(1, 1, 1, 0, 0, 0, 0, Py_None, 0);
if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
return NULL;
Py_DECREF(x);

x = new_datetime(MAXYEAR, 12, 31, 23, 59, 59, 999999, Py_None, 0);
if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
return NULL;
Py_DECREF(x);

x = new_delta(0, 0, 1, 0);
if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
return NULL;
Py_DECREF(x);
DATETIME_ADD_MACRO(d, "min",
new_datetime(1, 1, 1, 0, 0, 0, 0, Py_None, 0));
DATETIME_ADD_MACRO(d, "max", new_datetime(MAXYEAR, 12, 31, 23, 59, 59,
999999, Py_None, 0));
DATETIME_ADD_MACRO(d, "resolution", new_delta(0, 0, 1, 0));

/* timezone values */
d = PyDateTime_TimeZoneType.tp_dict;
PyObject *delta = new_delta(0, 0, 0, 0);
if (delta == NULL) {
return -1;
}

delta = new_delta(0, 0, 0, 0);
if (delta == NULL)
return NULL;
x = create_timezone(delta, NULL);
PyObject *x = create_timezone(delta, NULL);
Py_DECREF(delta);
if (x == NULL || PyDict_SetItemString(d, "utc", x) < 0)
return NULL;
if (x == NULL) {
return -1;
}
if (PyDict_SetItemString(d, "utc", x) < 0) {
Py_DECREF(x);
return -1;
}

PyDateTime_TimeZone_UTC = x;
CAPI.TimeZone_UTC = PyDateTime_TimeZone_UTC;

/* bpo-37642: These attributes are rounded to the nearest minute for backwards
* compatibility, even though the constructor will accept a wider range of
* values. This may change in the future.*/
delta = new_delta(-1, 60, 0, 1); /* -23:59 */
if (delta == NULL)
return NULL;
if (delta == NULL) {
return -1;
}

x = create_timezone(delta, NULL);
Py_DECREF(delta);
if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
return NULL;
Py_DECREF(x);
DATETIME_ADD_MACRO(d, "min", x);

delta = new_delta(0, (23 * 60 + 59) * 60, 0, 0); /* +23:59 */
if (delta == NULL)
return NULL;
if (delta == NULL) {
return -1;
}

x = create_timezone(delta, NULL);
Py_DECREF(delta);
if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
return NULL;
Py_DECREF(x);
DATETIME_ADD_MACRO(d, "max", x);

/* Epoch */
PyDateTime_Epoch = new_datetime(1970, 1, 1, 0, 0, 0, 0,
PyDateTime_TimeZone_UTC, 0);
if (PyDateTime_Epoch == NULL)
return NULL;
if (PyDateTime_Epoch == NULL) {
return -1;
}

/* module initialization */
PyModule_AddIntMacro(m, MINYEAR);
PyModule_AddIntMacro(m, MAXYEAR);
if (PyModule_AddIntMacro(module, MINYEAR) < 0) {
return -1;
}
if (PyModule_AddIntMacro(module, MAXYEAR) < 0) {
return -1;
}

x = PyCapsule_New(&CAPI, PyDateTime_CAPSULE_NAME, NULL);
if (x == NULL)
return NULL;
PyModule_AddObject(m, "datetime_CAPI", x);
if (x == NULL) {
return -1;
}

if (PyModule_AddObject(module, "datetime_CAPI", x) < 0) {
Py_DECREF(x);
return -1;
}

/* A 4-year cycle has an extra leap day over what we'd get from
* pasting together 4 single years.
Expand All @@ -6691,18 +6652,43 @@ PyInit__datetime(void)
us_per_minute = PyLong_FromLong(60000000);
seconds_per_day = PyLong_FromLong(24 * 3600);
if (us_per_ms == NULL || us_per_second == NULL ||
us_per_minute == NULL || seconds_per_day == NULL)
return NULL;
us_per_minute == NULL || seconds_per_day == NULL) {
return -1;
}

/* The rest are too big for 32-bit ints, but even
* us_per_week fits in 40 bits, so doubles should be exact.
*/
us_per_hour = PyLong_FromDouble(3600000000.0);
us_per_day = PyLong_FromDouble(86400000000.0);
us_per_week = PyLong_FromDouble(604800000000.0);
if (us_per_hour == NULL || us_per_day == NULL || us_per_week == NULL)
if (us_per_hour == NULL || us_per_day == NULL || us_per_week == NULL) {
return -1;
}
return 0;
}

static struct PyModuleDef datetimemodule = {
PyModuleDef_HEAD_INIT,
.m_name = "_datetime",
.m_doc = "Fast implementation of the datetime type.",
.m_size = -1,
.m_methods = module_methods,
};

PyMODINIT_FUNC
PyInit__datetime(void)
{
PyObject *mod = PyModule_Create(&datetimemodule);
if (mod == NULL)
return NULL;
return m;

if (_datetime_exec(mod) < 0) {
Py_DECREF(mod);
return NULL;
}

return mod;
}

/* ---------------------------------------------------------------------------
Expand Down