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implement chained exception tracebacks

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patch from Antoine Pitrou #3112
This commit is contained in:
Benjamin Peterson 2008-07-15 15:32:09 +00:00
parent 9bab65c259
commit e65282114e
10 changed files with 449 additions and 133 deletions
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22
Python/errors.c
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@ -84,8 +84,23 @@ PyErr_SetObject(PyObject *exception, PyObject *value)
return;
value = fixed_value;
}
Py_INCREF(tstate->exc_value);
PyException_SetContext(value, tstate->exc_value);
/* Avoid reference cycles through the context chain.
This is O(chain length) but context chains are
usually very short. Sensitive readers may try
to inline the call to PyException_GetContext. */
if (tstate->exc_value != value) {
PyObject *o = tstate->exc_value, *context;
while ((context = PyException_GetContext(o))) {
Py_DECREF(context);
if (context == value) {
PyException_SetContext(o, NULL);
break;
}
o = context;
}
Py_INCREF(tstate->exc_value);
PyException_SetContext(value, tstate->exc_value);
}
}
if (value != NULL && PyExceptionInstance_Check(value))
tb = PyException_GetTraceback(value);
@ -160,6 +175,9 @@ PyErr_ExceptionMatches(PyObject *exc)
/* Used in many places to normalize a raised exception, including in
eval_code2(), do_raise(), and PyErr_Print()
XXX: should PyErr_NormalizeException() also call
PyException_SetTraceback() with the resulting value and tb?
*/
void
PyErr_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)