exceptions.c

#include "parts.h"
#include "clinic/exceptions.c.h"

/*[clinic input]
module _testcapi
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=6361033e795369fc]*/

/*[clinic input]
_testcapi.err_set_raised
    exception as exc: object
    /
[clinic start generated code]*/

static PyObject *
_testcapi_err_set_raised(PyObject *module, PyObject *exc)
/*[clinic end generated code: output=0a0c7743961fcae5 input=c5f7331864a94df9]*/
{
    Py_INCREF(exc);
    PyErr_SetRaisedException(exc);
    assert(PyErr_Occurred());
    return NULL;
}

static PyObject *
err_restore(PyObject *self, PyObject *args) {
    PyObject *type = NULL, *value = NULL, *traceback = NULL;
    switch(PyTuple_Size(args)) {
        case 3:
            traceback = PyTuple_GetItem(args, 2);
            Py_INCREF(traceback);
            /* fall through */
        case 2:
            value = PyTuple_GetItem(args, 1);
            Py_INCREF(value);
            /* fall through */
        case 1:
            type = PyTuple_GetItem(args, 0);
            Py_INCREF(type);
            break;
        default:
            PyErr_SetString(PyExc_TypeError,
                        "wrong number of arguments");
            return NULL;
    }
    PyErr_Restore(type, value, traceback);
    assert(PyErr_Occurred());
    return NULL;
}

/*[clinic input]
_testcapi.exception_print
    exception as exc: object
    legacy: bool = False
    /

To test the format of exceptions as printed out.
[clinic start generated code]*/

static PyObject *
_testcapi_exception_print_impl(PyObject *module, PyObject *exc, int legacy)
/*[clinic end generated code: output=3f04fe0c18412ae0 input=c76f42cb94136dbf]*/
{
    if (legacy) {
        PyObject *tb = NULL;
        if (PyExceptionInstance_Check(exc)) {
            tb = PyException_GetTraceback(exc);
        }
        PyErr_Display((PyObject *) Py_TYPE(exc), exc, tb);
        Py_XDECREF(tb);
    }
    else {
        PyErr_DisplayException(exc);
    }
    Py_RETURN_NONE;
}

/*[clinic input]
_testcapi.make_exception_with_doc
    name: str
    doc: str = NULL
    base: object = NULL
    dict: object = NULL

Test PyErr_NewExceptionWithDoc (also exercise PyErr_NewException). Run via Lib/test/test_exceptions.py
[clinic start generated code]*/

static PyObject *
_testcapi_make_exception_with_doc_impl(PyObject *module, const char *name,
                                       const char *doc, PyObject *base,
                                       PyObject *dict)
/*[clinic end generated code: output=439f0d963c1ce2c4 input=23a73013f8a8795a]*/
{
    return PyErr_NewExceptionWithDoc(name, doc, base, dict);
}

/*[clinic input]
_testcapi.exc_set_object
    exception as exc: object
    obj: object
    /
[clinic start generated code]*/

static PyObject *
_testcapi_exc_set_object_impl(PyObject *module, PyObject *exc, PyObject *obj)
/*[clinic end generated code: output=34c8c7c83e5c8463 input=fc530aafb1b0a360]*/
{
    PyErr_SetObject(exc, obj);
    return NULL;
}

/*[clinic input]
_testcapi.exc_set_object_fetch = _testcapi.exc_set_object
[clinic start generated code]*/

static PyObject *
_testcapi_exc_set_object_fetch_impl(PyObject *module, PyObject *exc,
                                    PyObject *obj)
/*[clinic end generated code: output=7a5ff5f6d3cf687f input=77ec686f1f95fa38]*/
{
    PyObject *type;
    PyObject *value;
    PyObject *tb;

    PyErr_SetObject(exc, obj);
    PyErr_Fetch(&type, &value, &tb);
    Py_XDECREF(type);
    Py_XDECREF(tb);
    return value;
}

/*[clinic input]
_testcapi.raise_exception
    exception as exc: object
    num_args: int
    /
[clinic start generated code]*/

static PyObject *
_testcapi_raise_exception_impl(PyObject *module, PyObject *exc, int num_args)
/*[clinic end generated code: output=eb0a9c5d69e0542d input=83d6262c3829d088]*/
{
    PyObject *exc_args = PyTuple_New(num_args);
    if (exc_args == NULL) {
        return NULL;
    }
    for (int i = 0; i < num_args; ++i) {
        PyObject *v = PyLong_FromLong(i);
        if (v == NULL) {
            Py_DECREF(exc_args);
            return NULL;
        }
        PyTuple_SET_ITEM(exc_args, i, v);
    }
    PyErr_SetObject(exc, exc_args);
    Py_DECREF(exc_args);
    return NULL;
}

/*[clinic input]
_testcapi.raise_memoryerror
[clinic start generated code]*/

static PyObject *
_testcapi_raise_memoryerror_impl(PyObject *module)
/*[clinic end generated code: output=dd057803fb0131e6 input=6ca521bd07fb73cb]*/
{
    return PyErr_NoMemory();
}

/*[clinic input]
_testcapi.fatal_error
    message: str(accept={robuffer})
    release_gil: bool = False
    /
[clinic start generated code]*/

static PyObject *
_testcapi_fatal_error_impl(PyObject *module, const char *message,
                           int release_gil)
/*[clinic end generated code: output=9c3237116e6a03e8 input=1be357a2ccb04c8c]*/
{
    if (release_gil) {
        Py_BEGIN_ALLOW_THREADS
        Py_FatalError(message);
        Py_END_ALLOW_THREADS
    }
    else {
        Py_FatalError(message);
    }
    // Py_FatalError() does not return, but exits the process.
    Py_RETURN_NONE;
}

/*[clinic input]
_testcapi.set_exc_info
    new_type: object
    new_value: object
    new_tb: object
    /
[clinic start generated code]*/

static PyObject *
_testcapi_set_exc_info_impl(PyObject *module, PyObject *new_type,
                            PyObject *new_value, PyObject *new_tb)
/*[clinic end generated code: output=b55fa35dec31300e input=ea9f19e0f55fe5b3]*/
{
    PyObject *type, *value, *tb;
    PyErr_GetExcInfo(&type, &value, &tb);

    Py_INCREF(new_type);
    Py_INCREF(new_value);
    Py_INCREF(new_tb);
    PyErr_SetExcInfo(new_type, new_value, new_tb);

    PyObject *orig_exc = PyTuple_Pack(3,
            type  ? type  : Py_None,
            value ? value : Py_None,
            tb    ? tb    : Py_None);
    Py_XDECREF(type);
    Py_XDECREF(value);
    Py_XDECREF(tb);
    return orig_exc;
}

/*[clinic input]
_testcapi.set_exception
    new_exc: object
    /
[clinic start generated code]*/

static PyObject *
_testcapi_set_exception(PyObject *module, PyObject *new_exc)
/*[clinic end generated code: output=8b969b35d029e96d input=c89d4ca966c69738]*/
{
    PyObject *exc = PyErr_GetHandledException();
    assert(PyExceptionInstance_Check(exc) || exc == NULL);
    PyErr_SetHandledException(new_exc);
    return exc;
}

/*[clinic input]
_testcapi.write_unraisable_exc
    exception as exc: object
    err_msg: object
    obj: object
    /
[clinic start generated code]*/

static PyObject *
_testcapi_write_unraisable_exc_impl(PyObject *module, PyObject *exc,
                                    PyObject *err_msg, PyObject *obj)
/*[clinic end generated code: output=39827c5e0a8c2092 input=582498da5b2ee6cf]*/
{

    const char *err_msg_utf8;
    if (err_msg != Py_None) {
        err_msg_utf8 = PyUnicode_AsUTF8(err_msg);
        if (err_msg_utf8 == NULL) {
            return NULL;
        }
    }
    else {
        err_msg_utf8 = NULL;
    }

    PyErr_SetObject((PyObject *)Py_TYPE(exc), exc);
    _PyErr_WriteUnraisableMsg(err_msg_utf8, obj);
    Py_RETURN_NONE;
}

/*[clinic input]
_testcapi.traceback_print
    traceback: object
    file: object
    /
To test the format of tracebacks as printed out.
[clinic start generated code]*/

static PyObject *
_testcapi_traceback_print_impl(PyObject *module, PyObject *traceback,
                               PyObject *file)
/*[clinic end generated code: output=17074ecf9d95cf30 input=9423f2857b008ca8]*/
{
    if (PyTraceBack_Print(traceback, file) < 0) {
        return NULL;
    }
    Py_RETURN_NONE;
}

/*[clinic input]
_testcapi.unstable_exc_prep_reraise_star
    orig: object
    excs: object
    /
To test PyUnstable_Exc_PrepReraiseStar.
[clinic start generated code]*/

static PyObject *
_testcapi_unstable_exc_prep_reraise_star_impl(PyObject *module,
                                              PyObject *orig, PyObject *excs)
/*[clinic end generated code: output=850cf008e0563c77 input=27fbcda2203eb301]*/
{
    return PyUnstable_Exc_PrepReraiseStar(orig, excs);
}


/*
 * Define the PyRecurdingInfinitelyError_Type
 */

static PyTypeObject PyRecursingInfinitelyError_Type;

static int
recurse_infinitely_error_init(PyObject *self, PyObject *args, PyObject *kwds)
{
    PyObject *type = (PyObject *)&PyRecursingInfinitelyError_Type;

    /* Instantiating this exception starts infinite recursion. */
    Py_INCREF(type);
    PyErr_SetObject(type, NULL);
    return -1;
}

static PyTypeObject PyRecursingInfinitelyError_Type = {
    .tp_name = "RecursingInfinitelyError",
    .tp_basicsize = sizeof(PyBaseExceptionObject),
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_doc = PyDoc_STR("Instantiating this exception starts infinite recursion."),
    .tp_init = (initproc)recurse_infinitely_error_init,
};

static PyMethodDef test_methods[] = {
    {"err_restore",             err_restore,                     METH_VARARGS},
    _TESTCAPI_ERR_SET_RAISED_METHODDEF
    _TESTCAPI_EXCEPTION_PRINT_METHODDEF
    _TESTCAPI_FATAL_ERROR_METHODDEF
    _TESTCAPI_MAKE_EXCEPTION_WITH_DOC_METHODDEF
    _TESTCAPI_EXC_SET_OBJECT_METHODDEF
    _TESTCAPI_EXC_SET_OBJECT_FETCH_METHODDEF
    _TESTCAPI_RAISE_EXCEPTION_METHODDEF
    _TESTCAPI_RAISE_MEMORYERROR_METHODDEF
    _TESTCAPI_SET_EXC_INFO_METHODDEF
    _TESTCAPI_SET_EXCEPTION_METHODDEF
    _TESTCAPI_TRACEBACK_PRINT_METHODDEF
    _TESTCAPI_WRITE_UNRAISABLE_EXC_METHODDEF
    _TESTCAPI_UNSTABLE_EXC_PREP_RERAISE_STAR_METHODDEF
    {NULL},
};

int
_PyTestCapi_Init_Exceptions(PyObject *mod)
{
    PyRecursingInfinitelyError_Type.tp_base = (PyTypeObject *)PyExc_Exception;
    if (PyType_Ready(&PyRecursingInfinitelyError_Type) < 0) {
        return -1;
    }
    if (PyModule_AddObjectRef(mod, "RecursingInfinitelyError",
                              (PyObject *)&PyRecursingInfinitelyError_Type) < 0)
    {
        return -1;
    }

    if (PyModule_AddFunctions(mod, test_methods) < 0) {
        return -1;
    }

    return 0;
}