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gh-73180: Chain exceptions rather than dropping the old exception. #2072

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gh-73180: Chain exceptions rather than dropping the old exception. #2072

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0966866
bpo-28994: Chain exceptions rather than dropping the old exception.
serhiy-storchaka Jun 10, 2017
d69a996
Withdraw changes in Python/traceback.c.
serhiy-storchaka Nov 6, 2017
50c2947
Merge branch 'master' into chain-exceptions
serhiy-storchaka Feb 1, 2018
a3120c2
Merge branch 'master' into chain-exceptions
serhiy-storchaka Sep 22, 2018
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18 changes: 11 additions & 7 deletions Modules/_ctypes/callproc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -924,14 +924,17 @@ void _ctypes_extend_error(PyObject *exc_class, const char *fmt, ...)
va_list vargs;
PyObject *tp, *v, *tb, *s, *cls_str, *msg_str;

PyErr_Fetch(&tp, &v, &tb);
assert(tp != NULL);
PyErr_NormalizeException(&tp, &v, &tb);

va_start(vargs, fmt);
s = PyUnicode_FromFormatV(fmt, vargs);
va_end(vargs);
if (!s)
return;
if (s == NULL) {
goto error;
}

PyErr_Fetch(&tp, &v, &tb);
PyErr_NormalizeException(&tp, &v, &tb);
cls_str = PyObject_Str(tp);
if (cls_str) {
PyUnicode_AppendAndDel(&s, cls_str);
Expand All @@ -950,10 +953,11 @@ void _ctypes_extend_error(PyObject *exc_class, const char *fmt, ...)
if (s == NULL)
goto error;
PyErr_SetObject(exc_class, s);
Py_DECREF(s);
return;

error:
Py_XDECREF(tp);
Py_XDECREF(v);
Py_XDECREF(tb);
_PyErr_ChainExceptions(tp, v, tb);
Py_XDECREF(s);
}

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31 changes: 7 additions & 24 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4214,28 +4214,20 @@ call_exc_trace(Py_tracefunc func, PyObject *self,
PyThreadState *tstate, PyFrameObject *f)
{
PyObject *type, *value, *traceback, *orig_traceback, *arg;
int err;
PyErr_Fetch(&type, &value, &orig_traceback);
assert(type != NULL);
if (value == NULL) {
value = Py_None;
Py_INCREF(value);
}
PyErr_NormalizeException(&type, &value, &orig_traceback);
traceback = (orig_traceback != NULL) ? orig_traceback : Py_None;
arg = PyTuple_Pack(3, type, value, traceback);
if (arg == NULL) {
PyErr_Restore(type, value, orig_traceback);
return;
}
err = call_trace(func, self, tstate, f, PyTrace_EXCEPTION, arg);
Py_DECREF(arg);
if (err == 0)
PyErr_Restore(type, value, orig_traceback);
else {
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(orig_traceback);
if (arg != NULL) {
(void)call_trace(func, self, tstate, f, PyTrace_EXCEPTION, arg);
Py_DECREF(arg);
}
_PyErr_ChainExceptions(type, value, orig_traceback);
}

static int
Expand All @@ -4247,17 +4239,8 @@ call_trace_protected(Py_tracefunc func, PyObject *obj,
int err;
PyErr_Fetch(&type, &value, &traceback);
err = call_trace(func, obj, tstate, frame, what, arg);
if (err == 0)
{
PyErr_Restore(type, value, traceback);
return 0;
}
else {
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(traceback);
return -1;
}
_PyErr_ChainExceptions(type, value, traceback);
return err;
}

static int
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