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bpo-36381: warn when no PY_SSIZE_T_CLEAN #12473

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Merged
methane merged 3 commits into from
Mar 23, 2019
Merged

bpo-36381: warn when no PY_SSIZE_T_CLEAN #12473

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1c2a5d6
bpo-8677: warn when no PY_SSIZE_T_CLEAN
methane Mar 20, 2019
56d7806
add NEWS and whatsnew entry
methane Mar 20, 2019
0895793
Add some examples in what's new entry.
methane Mar 22, 2019
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10 changes: 10 additions & 0 deletions Doc/whatsnew/3.8.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -698,6 +698,16 @@ Changes in the Python API
set for regular user accounts.


Changes in the C API
--------------------

* Use of ``#`` variants of formats in parsing or building value (e.g.
:c:func:`PyArg_ParseTuple`, :c:func:`Py_BuildValue`, :c:func:`PyObject_CallFunction`,
etc.) without ``PY_SSIZE_T_CLEAN`` defined raises ``DeprecationWarning`` now.
It will be removed in 3.10 or 4.0. Read :ref:`arg-parsing` for detail.
(Contributed by Inada Naoki in :issue:`36381`.)


CPython bytecode changes
------------------------

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C API/2019-03-20-22-02-40.bpo-36381.xlzDJ2.rst
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@@ -0,0 +1,2 @@
Raise ``DeprecationWarning`` when '#' formats are used for building or
parsing values without ``PY_SSIZE_T_CLEAN``.
15 changes: 13 additions & 2 deletions Python/getargs.c
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Expand Up @@ -681,7 +681,13 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
/* For # codes */
#define FETCH_SIZE int *q=NULL;Py_ssize_t *q2=NULL;\
if (flags & FLAG_SIZE_T) q2=va_arg(*p_va, Py_ssize_t*); \
else q=va_arg(*p_va, int*);
else { \
if (PyErr_WarnEx(PyExc_DeprecationWarning, \
"PY_SSIZE_T_CLEAN will be required for '#' formats", 1)) { \
return NULL; \
} \
q=va_arg(*p_va, int*); \
}
#define STORE_SIZE(s) \
if (flags & FLAG_SIZE_T) \
*q2=s; \
Expand Down Expand Up @@ -2591,8 +2597,13 @@ skipitem(const char **p_format, va_list *p_va, int flags)
if (p_va != NULL) {
if (flags & FLAG_SIZE_T)
(void) va_arg(*p_va, Py_ssize_t *);
else
else {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#' formats", 1)) {
return NULL;
}
(void) va_arg(*p_va, int *);
}
}
format++;
} else if ((c == 's' || c == 'z' || c == 'y' || c == 'w')
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21 changes: 18 additions & 3 deletions Python/modsupport.c
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Expand Up @@ -342,8 +342,13 @@ do_mkvalue(const char **p_format, va_list *p_va, int flags)
++*p_format;
if (flags & FLAG_SIZE_T)
n = va_arg(*p_va, Py_ssize_t);
else
else {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#' formats", 1)) {
return NULL;
}
n = va_arg(*p_va, int);
}
}
else
n = -1;
Expand Down Expand Up @@ -390,8 +395,13 @@ do_mkvalue(const char **p_format, va_list *p_va, int flags)
++*p_format;
if (flags & FLAG_SIZE_T)
n = va_arg(*p_va, Py_ssize_t);
else
else {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#' formats", 1)) {
return NULL;
}
n = va_arg(*p_va, int);
}
}
else
n = -1;
Expand Down Expand Up @@ -423,8 +433,13 @@ do_mkvalue(const char **p_format, va_list *p_va, int flags)
++*p_format;
if (flags & FLAG_SIZE_T)
n = va_arg(*p_va, Py_ssize_t);
else
else {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#' formats", 1)) {
return NULL;
}
n = va_arg(*p_va, int);
}
}
else
n = -1;
Expand Down