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Implicit exception chaining via __context__ (PEP 3134).

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Patch 3108 by Antooine Pitrou.
This commit is contained in:
Guido van Rossum 2008-06-14 20:20:24 +00:00
parent 973124fd70
commit b4fb6e4d27
4 changed files with 139 additions and 33 deletions
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33
Python/errors.c
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@ -52,6 +52,9 @@ PyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)
void
PyErr_SetObject(PyObject *exception, PyObject *value)
{
PyThreadState *tstate = PyThreadState_GET();
PyObject *tb = NULL;
if (exception != NULL &&
!PyExceptionClass_Check(exception)) {
PyErr_Format(PyExc_SystemError,
@ -59,9 +62,35 @@ PyErr_SetObject(PyObject *exception, PyObject *value)
exception);
return;
}
Py_XINCREF(exception);
Py_XINCREF(value);
PyErr_Restore(exception, value, (PyObject *)NULL);
if (tstate->exc_value != NULL && tstate->exc_value != Py_None) {
/* Implicit exception chaining */
if (value == NULL || !PyExceptionInstance_Check(value)) {
/* We must normalize the value right now */
PyObject *args, *fixed_value;
if (value == NULL || value == Py_None)
args = PyTuple_New(0);
else if (PyTuple_Check(value)) {
Py_INCREF(value);
args = value;
}
else
args = PyTuple_Pack(1, value);
fixed_value = args ?
PyEval_CallObject(exception, args) : NULL;
Py_XDECREF(args);
Py_XDECREF(value);
if (fixed_value == NULL)
return;
value = fixed_value;
}
Py_INCREF(tstate->exc_value);
PyException_SetContext(value, tstate->exc_value);
}
if (value != NULL && PyExceptionInstance_Check(value))
tb = PyException_GetTraceback(value);
Py_XINCREF(exception);
PyErr_Restore(exception, value, tb);
}
void