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4519 lines (3912 loc) · 128 KB
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/*
* New exceptions.c written in Iceland by Richard Jones and Georg Brandl.
*
* Thanks go to Tim Peters and Michael Hudson for debugging.
*/
#include <Python.h>
#include <stdbool.h>
#include "pycore_abstract.h" // _PyObject_RealIsSubclass()
#include "pycore_ceval.h" // _Py_EnterRecursiveCall
#include "pycore_exceptions.h" // struct _Py_exc_state
#include "pycore_initconfig.h"
#include "pycore_modsupport.h" // _PyArg_NoKeywords()
#include "pycore_object.h"
#include "pycore_pyerrors.h" // struct _PyErr_SetRaisedException
#include "pycore_tuple.h" // _PyTuple_FromArray()
#include "osdefs.h" // SEP
#include "clinic/exceptions.c.h"
/*[clinic input]
class BaseException "PyBaseExceptionObject *" "&PyExc_BaseException"
class BaseExceptionGroup "PyBaseExceptionGroupObject *" "&PyExc_BaseExceptionGroup"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b7c45e78cff8edc3]*/
/* Compatibility aliases */
PyObject *PyExc_EnvironmentError = NULL; // borrowed ref
PyObject *PyExc_IOError = NULL; // borrowed ref
#ifdef MS_WINDOWS
PyObject *PyExc_WindowsError = NULL; // borrowed ref
#endif
static struct _Py_exc_state*
get_exc_state(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return &interp->exc_state;
}
/* NOTE: If the exception class hierarchy changes, don't forget to update
* Lib/test/exception_hierarchy.txt
*/
static inline PyBaseExceptionObject *
PyBaseExceptionObject_CAST(PyObject *exc)
{
assert(PyExceptionInstance_Check(exc));
return (PyBaseExceptionObject *)exc;
}
/*
* BaseException
*/
static PyObject *
BaseException_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyBaseExceptionObject *self;
self = (PyBaseExceptionObject *)type->tp_alloc(type, 0);
if (!self)
return NULL;
/* the dict is created on the fly in PyObject_GenericSetAttr */
self->dict = NULL;
self->notes = NULL;
self->traceback = self->cause = self->context = NULL;
self->suppress_context = 0;
if (args) {
self->args = Py_NewRef(args);
return (PyObject *)self;
}
self->args = PyTuple_New(0);
if (!self->args) {
Py_DECREF(self);
return NULL;
}
return (PyObject *)self;
}
static int
BaseException_init(PyObject *op, PyObject *args, PyObject *kwds)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
if (!_PyArg_NoKeywords(Py_TYPE(self)->tp_name, kwds))
return -1;
Py_XSETREF(self->args, Py_NewRef(args));
return 0;
}
static PyObject *
BaseException_vectorcall(PyObject *type_obj, PyObject * const*args,
size_t nargsf, PyObject *kwnames)
{
PyTypeObject *type = _PyType_CAST(type_obj);
if (!_PyArg_NoKwnames(type->tp_name, kwnames)) {
return NULL;
}
PyBaseExceptionObject *self;
self = (PyBaseExceptionObject *)type->tp_alloc(type, 0);
if (!self) {
return NULL;
}
// The dict is created on the fly in PyObject_GenericSetAttr()
self->dict = NULL;
self->notes = NULL;
self->traceback = NULL;
self->cause = NULL;
self->context = NULL;
self->suppress_context = 0;
self->args = _PyTuple_FromArray(args, PyVectorcall_NARGS(nargsf));
if (!self->args) {
Py_DECREF(self);
return NULL;
}
return (PyObject *)self;
}
static int
BaseException_clear(PyObject *op)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
Py_CLEAR(self->dict);
Py_CLEAR(self->args);
Py_CLEAR(self->notes);
Py_CLEAR(self->traceback);
Py_CLEAR(self->cause);
Py_CLEAR(self->context);
return 0;
}
static void
BaseException_dealloc(PyObject *op)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
PyObject_GC_UnTrack(self);
// bpo-44348: The trashcan mechanism prevents stack overflow when deleting
// long chains of exceptions. For example, exceptions can be chained
// through the __context__ attributes or the __traceback__ attribute.
(void)BaseException_clear(op);
Py_TYPE(self)->tp_free(self);
}
static int
BaseException_traverse(PyObject *op, visitproc visit, void *arg)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
Py_VISIT(self->dict);
Py_VISIT(self->args);
Py_VISIT(self->notes);
Py_VISIT(self->traceback);
Py_VISIT(self->cause);
Py_VISIT(self->context);
return 0;
}
static PyObject *
BaseException_str(PyObject *op)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
PyObject *res;
Py_BEGIN_CRITICAL_SECTION(self);
switch (PyTuple_GET_SIZE(self->args)) {
case 0:
res = Py_GetConstant(Py_CONSTANT_EMPTY_STR);
break;
case 1:
res = PyObject_Str(PyTuple_GET_ITEM(self->args, 0));
break;
default:
res = PyObject_Str(self->args);
break;
}
Py_END_CRITICAL_SECTION();
return res;
}
static PyObject *
BaseException_repr(PyObject *op)
{
PyBaseExceptionObject *self = PyBaseExceptionObject_CAST(op);
PyObject *res;
Py_BEGIN_CRITICAL_SECTION(self);
const char *name = _PyType_Name(Py_TYPE(self));
if (PyTuple_GET_SIZE(self->args) == 1) {
res = PyUnicode_FromFormat("%s(%R)", name,
PyTuple_GET_ITEM(self->args, 0));
}
else {
res = PyUnicode_FromFormat("%s%R", name, self->args);
}
Py_END_CRITICAL_SECTION();
return res;
}
/* Pickling support */
/*[clinic input]
@critical_section
BaseException.__reduce__
[clinic start generated code]*/
static PyObject *
BaseException___reduce___impl(PyBaseExceptionObject *self)
/*[clinic end generated code: output=af87c1247ef98748 input=283be5a10d9c964f]*/
{
if (self->args && self->dict)
return PyTuple_Pack(3, Py_TYPE(self), self->args, self->dict);
else
return PyTuple_Pack(2, Py_TYPE(self), self->args);
}
/*
* Needed for backward compatibility, since exceptions used to store
* all their attributes in the __dict__. Code is taken from cPickle's
* load_build function.
*/
/*[clinic input]
@critical_section
BaseException.__setstate__
state: object
/
[clinic start generated code]*/
static PyObject *
BaseException___setstate___impl(PyBaseExceptionObject *self, PyObject *state)
/*[clinic end generated code: output=f3834889950453ab input=5524b61cfe9b9856]*/
{
PyObject *d_key, *d_value;
Py_ssize_t i = 0;
if (state != Py_None) {
if (!PyDict_Check(state)) {
PyErr_SetString(PyExc_TypeError, "state is not a dictionary");
return NULL;
}
while (PyDict_Next(state, &i, &d_key, &d_value)) {
Py_INCREF(d_key);
Py_INCREF(d_value);
int res = PyObject_SetAttr((PyObject *)self, d_key, d_value);
Py_DECREF(d_value);
Py_DECREF(d_key);
if (res < 0) {
return NULL;
}
}
}
Py_RETURN_NONE;
}
/*[clinic input]
@critical_section
BaseException.with_traceback
tb: object
/
Set self.__traceback__ to tb and return self.
[clinic start generated code]*/
static PyObject *
BaseException_with_traceback_impl(PyBaseExceptionObject *self, PyObject *tb)
/*[clinic end generated code: output=81e92f2387927f10 input=b5fb64d834717e36]*/
{
if (BaseException___traceback___set_impl(self, tb) < 0){
return NULL;
}
return Py_NewRef(self);
}
/*[clinic input]
@critical_section
BaseException.add_note
note: object(subclass_of="&PyUnicode_Type")
/
Add a note to the exception
[clinic start generated code]*/
static PyObject *
BaseException_add_note_impl(PyBaseExceptionObject *self, PyObject *note)
/*[clinic end generated code: output=fb7cbcba611c187b input=e60a6b6e9596acaf]*/
{
PyObject *notes;
if (PyObject_GetOptionalAttr((PyObject *)self, &_Py_ID(__notes__), ¬es) < 0) {
return NULL;
}
if (notes == NULL) {
notes = PyList_New(0);
if (notes == NULL) {
return NULL;
}
if (PyObject_SetAttr((PyObject *)self, &_Py_ID(__notes__), notes) < 0) {
Py_DECREF(notes);
return NULL;
}
}
else if (!PyList_Check(notes)) {
Py_DECREF(notes);
PyErr_SetString(PyExc_TypeError, "Cannot add note: __notes__ is not a list");
return NULL;
}
if (PyList_Append(notes, note) < 0) {
Py_DECREF(notes);
return NULL;
}
Py_DECREF(notes);
Py_RETURN_NONE;
}
static PyMethodDef BaseException_methods[] = {
BASEEXCEPTION___REDUCE___METHODDEF
BASEEXCEPTION___SETSTATE___METHODDEF
BASEEXCEPTION_WITH_TRACEBACK_METHODDEF
BASEEXCEPTION_ADD_NOTE_METHODDEF
{NULL, NULL, 0, NULL},
};
/*[clinic input]
@critical_section
@getter
BaseException.args
[clinic start generated code]*/
static PyObject *
BaseException_args_get_impl(PyBaseExceptionObject *self)
/*[clinic end generated code: output=e02e34e35cf4d677 input=64282386e4d7822d]*/
{
if (self->args == NULL) {
Py_RETURN_NONE;
}
return Py_NewRef(self->args);
}
/*[clinic input]
@critical_section
@setter
BaseException.args
[clinic start generated code]*/
static int
BaseException_args_set_impl(PyBaseExceptionObject *self, PyObject *value)
/*[clinic end generated code: output=331137e11d8f9e80 input=2400047ea5970a84]*/
{
PyObject *seq;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "args may not be deleted");
return -1;
}
seq = PySequence_Tuple(value);
if (!seq)
return -1;
Py_XSETREF(self->args, seq);
return 0;
}
/*[clinic input]
@critical_section
@getter
BaseException.__traceback__
[clinic start generated code]*/
static PyObject *
BaseException___traceback___get_impl(PyBaseExceptionObject *self)
/*[clinic end generated code: output=17cf874a52339398 input=a2277f0de62170cf]*/
{
if (self->traceback == NULL) {
Py_RETURN_NONE;
}
return Py_NewRef(self->traceback);
}
/*[clinic input]
@critical_section
@setter
BaseException.__traceback__
[clinic start generated code]*/
static int
BaseException___traceback___set_impl(PyBaseExceptionObject *self,
PyObject *value)
/*[clinic end generated code: output=a82c86d9f29f48f0 input=12676035676badad]*/
{
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "__traceback__ may not be deleted");
return -1;
}
if (PyTraceBack_Check(value)) {
Py_XSETREF(self->traceback, Py_NewRef(value));
}
else if (value == Py_None) {
Py_CLEAR(self->traceback);
}
else {
PyErr_SetString(PyExc_TypeError,
"__traceback__ must be a traceback or None");
return -1;
}
return 0;
}
/*[clinic input]
@critical_section
@getter
BaseException.__context__
[clinic start generated code]*/
static PyObject *
BaseException___context___get_impl(PyBaseExceptionObject *self)
/*[clinic end generated code: output=6ec5d296ce8d1c93 input=b2d22687937e66ab]*/
{
if (self->context == NULL) {
Py_RETURN_NONE;
}
return Py_NewRef(self->context);
}
/*[clinic input]
@critical_section
@setter
BaseException.__context__
[clinic start generated code]*/
static int
BaseException___context___set_impl(PyBaseExceptionObject *self,
PyObject *value)
/*[clinic end generated code: output=b4cb52dcca1da3bd input=c0971adf47fa1858]*/
{
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "__context__ may not be deleted");
return -1;
} else if (value == Py_None) {
value = NULL;
} else if (!PyExceptionInstance_Check(value)) {
PyErr_SetString(PyExc_TypeError, "exception context must be None "
"or derive from BaseException");
return -1;
} else {
Py_INCREF(value);
}
Py_XSETREF(self->context, value);
return 0;
}
/*[clinic input]
@critical_section
@getter
BaseException.__cause__
[clinic start generated code]*/
static PyObject *
BaseException___cause___get_impl(PyBaseExceptionObject *self)
/*[clinic end generated code: output=987f6c4d8a0bdbab input=40e0eac427b6e602]*/
{
if (self->cause == NULL) {
Py_RETURN_NONE;
}
return Py_NewRef(self->cause);
}
/*[clinic input]
@critical_section
@setter
BaseException.__cause__
[clinic start generated code]*/
static int
BaseException___cause___set_impl(PyBaseExceptionObject *self,
PyObject *value)
/*[clinic end generated code: output=6161315398aaf541 input=e1b403c0bde3f62a]*/
{
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "__cause__ may not be deleted");
return -1;
} else if (value == Py_None) {
value = NULL;
} else if (!PyExceptionInstance_Check(value)) {
PyErr_SetString(PyExc_TypeError, "exception cause must be None "
"or derive from BaseException");
return -1;
} else {
/* PyException_SetCause steals this reference */
Py_INCREF(value);
}
PyException_SetCause((PyObject *)self, value);
return 0;
}
static PyGetSetDef BaseException_getset[] = {
{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
BASEEXCEPTION_ARGS_GETSETDEF
BASEEXCEPTION___TRACEBACK___GETSETDEF
BASEEXCEPTION___CONTEXT___GETSETDEF
BASEEXCEPTION___CAUSE___GETSETDEF
{NULL},
};
PyObject *
PyException_GetTraceback(PyObject *self)
{
PyObject *traceback;
Py_BEGIN_CRITICAL_SECTION(self);
traceback = Py_XNewRef(PyBaseExceptionObject_CAST(self)->traceback);
Py_END_CRITICAL_SECTION();
return traceback;
}
int
PyException_SetTraceback(PyObject *self, PyObject *tb)
{
int res;
Py_BEGIN_CRITICAL_SECTION(self);
res = BaseException___traceback___set_impl(PyBaseExceptionObject_CAST(self), tb);
Py_END_CRITICAL_SECTION();
return res;
}
PyObject *
PyException_GetCause(PyObject *self)
{
PyObject *cause;
Py_BEGIN_CRITICAL_SECTION(self);
cause = Py_XNewRef(PyBaseExceptionObject_CAST(self)->cause);
Py_END_CRITICAL_SECTION();
return cause;
}
/* Steals a reference to cause */
void
PyException_SetCause(PyObject *self, PyObject *cause)
{
Py_BEGIN_CRITICAL_SECTION(self);
PyBaseExceptionObject *base_self = PyBaseExceptionObject_CAST(self);
base_self->suppress_context = 1;
Py_XSETREF(base_self->cause, cause);
Py_END_CRITICAL_SECTION();
}
PyObject *
PyException_GetContext(PyObject *self)
{
PyObject *context;
Py_BEGIN_CRITICAL_SECTION(self);
context = Py_XNewRef(PyBaseExceptionObject_CAST(self)->context);
Py_END_CRITICAL_SECTION();
return context;
}
/* Steals a reference to context */
void
PyException_SetContext(PyObject *self, PyObject *context)
{
Py_BEGIN_CRITICAL_SECTION(self);
Py_XSETREF(PyBaseExceptionObject_CAST(self)->context, context);
Py_END_CRITICAL_SECTION();
}
PyObject *
PyException_GetArgs(PyObject *self)
{
PyObject *args;
Py_BEGIN_CRITICAL_SECTION(self);
args = Py_NewRef(PyBaseExceptionObject_CAST(self)->args);
Py_END_CRITICAL_SECTION();
return args;
}
void
PyException_SetArgs(PyObject *self, PyObject *args)
{
Py_BEGIN_CRITICAL_SECTION(self);
Py_INCREF(args);
Py_XSETREF(PyBaseExceptionObject_CAST(self)->args, args);
Py_END_CRITICAL_SECTION();
}
const char *
PyExceptionClass_Name(PyObject *ob)
{
assert(PyExceptionClass_Check(ob));
return ((PyTypeObject*)ob)->tp_name;
}
static struct PyMemberDef BaseException_members[] = {
{"__suppress_context__", Py_T_BOOL,
offsetof(PyBaseExceptionObject, suppress_context)},
{NULL}
};
static PyTypeObject _PyExc_BaseException = {
PyVarObject_HEAD_INIT(NULL, 0)
"BaseException", /*tp_name*/
sizeof(PyBaseExceptionObject), /*tp_basicsize*/
0, /*tp_itemsize*/
BaseException_dealloc, /*tp_dealloc*/
0, /*tp_vectorcall_offset*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_as_async*/
BaseException_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
BaseException_str, /*tp_str*/
PyObject_GenericGetAttr, /*tp_getattro*/
PyObject_GenericSetAttr, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASE_EXC_SUBCLASS, /*tp_flags*/
PyDoc_STR("Common base class for all exceptions"), /* tp_doc */
BaseException_traverse, /* tp_traverse */
BaseException_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
BaseException_methods, /* tp_methods */
BaseException_members, /* tp_members */
BaseException_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(PyBaseExceptionObject, dict), /* tp_dictoffset */
BaseException_init, /* tp_init */
0, /* tp_alloc */
BaseException_new, /* tp_new */
.tp_vectorcall = BaseException_vectorcall,
};
/* the CPython API expects exceptions to be (PyObject *) - both a hold-over
from the previous implementation and also allowing Python objects to be used
in the API */
PyObject *PyExc_BaseException = (PyObject *)&_PyExc_BaseException;
/* note these macros omit the last semicolon so the macro invocation may
* include it and not look strange.
*/
#define SimpleExtendsException(EXCBASE, EXCNAME, EXCDOC) \
static PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# EXCNAME, \
sizeof(PyBaseExceptionObject), \
0, BaseException_dealloc, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, 0, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), BaseException_traverse, \
BaseException_clear, 0, 0, 0, 0, 0, 0, 0, &_ ## EXCBASE, \
0, 0, 0, offsetof(PyBaseExceptionObject, dict), \
BaseException_init, 0, BaseException_new,\
}; \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
#define MiddlingExtendsExceptionEx(EXCBASE, EXCNAME, PYEXCNAME, EXCSTORE, EXCDOC) \
PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# PYEXCNAME, \
sizeof(Py ## EXCSTORE ## Object), \
0, EXCSTORE ## _dealloc, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), EXCSTORE ## _traverse, \
EXCSTORE ## _clear, 0, 0, 0, 0, 0, 0, 0, &_ ## EXCBASE, \
0, 0, 0, offsetof(Py ## EXCSTORE ## Object, dict), \
EXCSTORE ## _init, 0, 0, \
};
#define MiddlingExtendsException(EXCBASE, EXCNAME, EXCSTORE, EXCDOC) \
static MiddlingExtendsExceptionEx( \
EXCBASE, EXCNAME, EXCNAME, EXCSTORE, EXCDOC); \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
#define ComplexExtendsException(EXCBASE, EXCNAME, EXCSTORE, EXCNEW, \
EXCMETHODS, EXCMEMBERS, EXCGETSET, \
EXCSTR, EXCDOC) \
static PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# EXCNAME, \
sizeof(Py ## EXCSTORE ## Object), 0, \
EXCSTORE ## _dealloc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
EXCSTR, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), EXCSTORE ## _traverse, \
EXCSTORE ## _clear, 0, 0, 0, 0, EXCMETHODS, \
EXCMEMBERS, EXCGETSET, &_ ## EXCBASE, \
0, 0, 0, offsetof(Py ## EXCSTORE ## Object, dict), \
EXCSTORE ## _init, 0, EXCNEW,\
}; \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
/*
* Exception extends BaseException
*/
SimpleExtendsException(PyExc_BaseException, Exception,
"Common base class for all non-exit exceptions.");
/*
* TypeError extends Exception
*/
SimpleExtendsException(PyExc_Exception, TypeError,
"Inappropriate argument type.");
/*
* StopAsyncIteration extends Exception
*/
SimpleExtendsException(PyExc_Exception, StopAsyncIteration,
"Signal the end from iterator.__anext__().");
/*
* StopIteration extends Exception
*/
static PyMemberDef StopIteration_members[] = {
{"value", _Py_T_OBJECT, offsetof(PyStopIterationObject, value), 0,
PyDoc_STR("generator return value")},
{NULL} /* Sentinel */
};
static inline PyStopIterationObject *
PyStopIterationObject_CAST(PyObject *self)
{
assert(PyObject_TypeCheck(self, (PyTypeObject *)PyExc_StopIteration));
return (PyStopIterationObject *)self;
}
static int
StopIteration_init(PyObject *op, PyObject *args, PyObject *kwds)
{
Py_ssize_t size = PyTuple_GET_SIZE(args);
PyObject *value;
if (BaseException_init(op, args, kwds) == -1)
return -1;
PyStopIterationObject *self = PyStopIterationObject_CAST(op);
Py_CLEAR(self->value);
if (size > 0)
value = PyTuple_GET_ITEM(args, 0);
else
value = Py_None;
self->value = Py_NewRef(value);
return 0;
}
static int
StopIteration_clear(PyObject *op)
{
PyStopIterationObject *self = PyStopIterationObject_CAST(op);
Py_CLEAR(self->value);
return BaseException_clear(op);
}
static void
StopIteration_dealloc(PyObject *self)
{
PyObject_GC_UnTrack(self);
(void)StopIteration_clear(self);
Py_TYPE(self)->tp_free(self);
}
static int
StopIteration_traverse(PyObject *op, visitproc visit, void *arg)
{
PyStopIterationObject *self = PyStopIterationObject_CAST(op);
Py_VISIT(self->value);
return BaseException_traverse(op, visit, arg);
}
ComplexExtendsException(PyExc_Exception, StopIteration, StopIteration,
0, 0, StopIteration_members, 0, 0,
"Signal the end from iterator.__next__().");
/*
* GeneratorExit extends BaseException
*/
SimpleExtendsException(PyExc_BaseException, GeneratorExit,
"Request that a generator exit.");
/*
* SystemExit extends BaseException
*/
static inline PySystemExitObject *
PySystemExitObject_CAST(PyObject *self)
{
assert(PyObject_TypeCheck(self, (PyTypeObject *)PyExc_SystemExit));
return (PySystemExitObject *)self;
}
static int
SystemExit_init(PyObject *op, PyObject *args, PyObject *kwds)
{
Py_ssize_t size = PyTuple_GET_SIZE(args);
if (BaseException_init(op, args, kwds) == -1)
return -1;
PySystemExitObject *self = PySystemExitObject_CAST(op);
if (size == 0)
return 0;
if (size == 1) {
Py_XSETREF(self->code, Py_NewRef(PyTuple_GET_ITEM(args, 0)));
}
else { /* size > 1 */
Py_XSETREF(self->code, Py_NewRef(args));
}
return 0;
}
static int
SystemExit_clear(PyObject *op)
{
PySystemExitObject *self = PySystemExitObject_CAST(op);
Py_CLEAR(self->code);
return BaseException_clear(op);
}
static void
SystemExit_dealloc(PyObject *self)
{
_PyObject_GC_UNTRACK(self);
(void)SystemExit_clear(self);
Py_TYPE(self)->tp_free(self);
}
static int
SystemExit_traverse(PyObject *op, visitproc visit, void *arg)
{
PySystemExitObject *self = PySystemExitObject_CAST(op);
Py_VISIT(self->code);
return BaseException_traverse(op, visit, arg);
}
static PyMemberDef SystemExit_members[] = {
{"code", _Py_T_OBJECT, offsetof(PySystemExitObject, code), 0,
PyDoc_STR("exception code")},
{NULL} /* Sentinel */
};
ComplexExtendsException(PyExc_BaseException, SystemExit, SystemExit,
0, 0, SystemExit_members, 0, 0,
"Request to exit from the interpreter.");
/*
* BaseExceptionGroup extends BaseException
* ExceptionGroup extends BaseExceptionGroup and Exception
*/
static inline PyBaseExceptionGroupObject*
PyBaseExceptionGroupObject_CAST(PyObject *exc)
{
assert(_PyBaseExceptionGroup_Check(exc));
return (PyBaseExceptionGroupObject *)exc;
}
static PyObject *
BaseExceptionGroup_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
struct _Py_exc_state *state = get_exc_state();
PyTypeObject *PyExc_ExceptionGroup =
(PyTypeObject*)state->PyExc_ExceptionGroup;
PyObject *message = NULL;
PyObject *exceptions = NULL;
if (!PyArg_ParseTuple(args,
"UO:BaseExceptionGroup.__new__",
&message,
&exceptions)) {
return NULL;
}
if (!PySequence_Check(exceptions)) {
PyErr_SetString(
PyExc_TypeError,
"second argument (exceptions) must be a sequence");
return NULL;
}
exceptions = PySequence_Tuple(exceptions);
if (!exceptions) {
return NULL;
}
/* We are now holding a ref to the exceptions tuple */
Py_ssize_t numexcs = PyTuple_GET_SIZE(exceptions);
if (numexcs == 0) {
PyErr_SetString(
PyExc_ValueError,
"second argument (exceptions) must be a non-empty sequence");
goto error;
}
bool nested_base_exceptions = false;
for (Py_ssize_t i = 0; i < numexcs; i++) {
PyObject *exc = PyTuple_GET_ITEM(exceptions, i);
if (!exc) {
goto error;
}
if (!PyExceptionInstance_Check(exc)) {
PyErr_Format(
PyExc_ValueError,
"Item %d of second argument (exceptions) is not an exception",
i);
goto error;
}
int is_nonbase_exception = PyObject_IsInstance(exc, PyExc_Exception);
if (is_nonbase_exception < 0) {
goto error;
}
else if (is_nonbase_exception == 0) {
nested_base_exceptions = true;
}
}
PyTypeObject *cls = type;
if (cls == PyExc_ExceptionGroup) {
if (nested_base_exceptions) {
PyErr_SetString(PyExc_TypeError,
"Cannot nest BaseExceptions in an ExceptionGroup");
goto error;
}
}
else if (cls == (PyTypeObject*)PyExc_BaseExceptionGroup) {
if (!nested_base_exceptions) {
/* All nested exceptions are Exception subclasses,
* wrap them in an ExceptionGroup
*/
cls = PyExc_ExceptionGroup;
}
}
else {
/* user-defined subclass */
if (nested_base_exceptions) {
int nonbase = PyObject_IsSubclass((PyObject*)cls, PyExc_Exception);
if (nonbase == -1) {
goto error;
}
else if (nonbase == 1) {
PyErr_Format(PyExc_TypeError,
"Cannot nest BaseExceptions in '%.200s'",
cls->tp_name);
goto error;
}
}
}
if (!cls) {
/* Don't crash during interpreter shutdown
* (PyExc_ExceptionGroup may have been cleared)
*/
cls = (PyTypeObject*)PyExc_BaseExceptionGroup;
}
PyBaseExceptionGroupObject *self =
PyBaseExceptionGroupObject_CAST(BaseException_new(cls, args, kwds));
if (!self) {
goto error;
}
self->msg = Py_NewRef(message);
self->excs = exceptions;
return (PyObject*)self;
error:
Py_DECREF(exceptions);
return NULL;
}
PyObject *
_PyExc_CreateExceptionGroup(const char *msg_str, PyObject *excs)
{
You can’t perform that action at this time.