/* Error handling */

#include "Python.h"

#include "internal/pystate.h"

#ifndef __STDC__

#ifndef MS_WINDOWS

extern char *strerror(int);

#endif

#endif

#ifdef MS_WINDOWS

#include <windows.h>

#include <winbase.h>

#endif

#include <ctype.h>

#ifdef __cplusplus

extern "C" {

#endif

_Py_IDENTIFIER(builtins);

_Py_IDENTIFIER(stderr);

void

PyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *oldtype, *oldvalue, *oldtraceback;

if (traceback != NULL && !PyTraceBack_Check(traceback)) {

/* XXX Should never happen -- fatal error instead? */

/* Well, it could be None. */

Py_DECREF(traceback);

traceback = NULL;

}

/* Save these in locals to safeguard against recursive

invocation through Py_XDECREF */

oldtype = tstate->curexc_type;

oldvalue = tstate->curexc_value;

oldtraceback = tstate->curexc_traceback;

tstate->curexc_type = type;

tstate->curexc_value = value;

tstate->curexc_traceback = traceback;

Py_XDECREF(oldtype);

Py_XDECREF(oldvalue);

Py_XDECREF(oldtraceback);

}

_PyErr_StackItem *

_PyErr_GetTopmostException(PyThreadState *tstate)

{

_PyErr_StackItem *exc_info = tstate->exc_info;

while ((exc_info->exc_type == NULL || exc_info->exc_type == Py_None) &&

exc_info->previous_item != NULL)

{

exc_info = exc_info->previous_item;

}

return exc_info;

}

static PyObject*

_PyErr_CreateException(PyObject *exception, PyObject *value)

{

if (value == NULL || value == Py_None) {

return _PyObject_CallNoArg(exception);

}

else if (PyTuple_Check(value)) {

return PyObject_Call(exception, value, NULL);

}

else {

return PyObject_CallFunctionObjArgs(exception, value, NULL);

}

}

void

PyErr_SetObject(PyObject *exception, PyObject *value)

{

PyThreadState *tstate = PyThreadState_GET();

PyObject *exc_value;

PyObject *tb = NULL;

if (exception != NULL &&

!PyExceptionClass_Check(exception)) {

PyErr_Format(PyExc_SystemError,

"exception %R not a BaseException subclass",

exception);

return;

}

Py_XINCREF(value);

exc_value = _PyErr_GetTopmostException(tstate)->exc_value;

if (exc_value != NULL && exc_value != Py_None) {

/* Implicit exception chaining */

Py_INCREF(exc_value);

if (value == NULL || !PyExceptionInstance_Check(value)) {

/* We must normalize the value right now */

PyObject *fixed_value;

/* Issue #23571: functions must not be called with an

exception set */

PyErr_Clear();

fixed_value = _PyErr_CreateException(exception, value);

Py_XDECREF(value);

if (fixed_value == NULL) {

return;

}

value = fixed_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 (exc_value != value) {

PyObject *o = exc_value, *context;

while ((context = PyException_GetContext(o))) {

Py_DECREF(context);

if (context == value) {

PyException_SetContext(o, NULL);

break;

}

o = context;

}

PyException_SetContext(value, exc_value);

}

else {

Py_DECREF(exc_value);

}

}

if (value != NULL && PyExceptionInstance_Check(value))

tb = PyException_GetTraceback(value);

Py_XINCREF(exception);

PyErr_Restore(exception, value, tb);

}

/* Set a key error with the specified argument, wrapping it in a

* tuple automatically so that tuple keys are not unpacked as the

* exception arguments. */

void

_PyErr_SetKeyError(PyObject *arg)

{

PyObject *tup;

tup = PyTuple_Pack(1, arg);

if (!tup)

return; /* caller will expect error to be set anyway */

PyErr_SetObject(PyExc_KeyError, tup);

Py_DECREF(tup);

}

void

PyErr_SetNone(PyObject *exception)

{

PyErr_SetObject(exception, (PyObject *)NULL);

}

void

PyErr_SetString(PyObject *exception, const char *string)

{

PyObject *value = PyUnicode_FromString(string);

PyErr_SetObject(exception, value);

Py_XDECREF(value);

}

PyObject* _Py_HOT_FUNCTION

PyErr_Occurred(void)

{

PyThreadState *tstate = PyThreadState_GET();

return tstate == NULL ? NULL : tstate->curexc_type;

}

int

PyErr_GivenExceptionMatches(PyObject *err, PyObject *exc)

{

if (err == NULL || exc == NULL) {

/* maybe caused by "import exceptions" that failed early on */

return 0;

}

if (PyTuple_Check(exc)) {

Py_ssize_t i, n;

n = PyTuple_Size(exc);

for (i = 0; i < n; i++) {

/* Test recursively */

if (PyErr_GivenExceptionMatches(

err, PyTuple_GET_ITEM(exc, i)))

{

return 1;

}

}

return 0;

}

/* err might be an instance, so check its class. */

if (PyExceptionInstance_Check(err))

err = PyExceptionInstance_Class(err);

if (PyExceptionClass_Check(err) && PyExceptionClass_Check(exc)) {

return PyType_IsSubtype((PyTypeObject *)err, (PyTypeObject *)exc);

}

return err == exc;

}

int

PyErr_ExceptionMatches(PyObject *exc)

{

return PyErr_GivenExceptionMatches(PyErr_Occurred(), exc);

}

#ifndef Py_NORMALIZE_RECURSION_LIMIT

#define Py_NORMALIZE_RECURSION_LIMIT 32

#endif

/* 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)

{

int recursion_depth = 0;

PyObject *type, *value, *initial_tb;

restart:

type = *exc;

if (type == NULL) {

/* There was no exception, so nothing to do. */

return;

}

value = *val;

/* If PyErr_SetNone() was used, the value will have been actually

set to NULL.

*/

if (!value) {

value = Py_None;

Py_INCREF(value);

}

/* Normalize the exception so that if the type is a class, the

value will be an instance.

*/

if (PyExceptionClass_Check(type)) {

PyObject *inclass = NULL;

int is_subclass = 0;

if (PyExceptionInstance_Check(value)) {

inclass = PyExceptionInstance_Class(value);

is_subclass = PyObject_IsSubclass(inclass, type);

if (is_subclass < 0) {

goto error;

}

}

/* If the value was not an instance, or is not an instance

whose class is (or is derived from) type, then use the

value as an argument to instantiation of the type

class.

*/

if (!is_subclass) {

PyObject *fixed_value = _PyErr_CreateException(type, value);

if (fixed_value == NULL) {

goto error;

}

Py_DECREF(value);

value = fixed_value;

}

/* If the class of the instance doesn't exactly match the

class of the type, believe the instance.

*/

else if (inclass != type) {

Py_INCREF(inclass);

Py_DECREF(type);

type = inclass;

}

}

*exc = type;

*val = value;

return;

error:

Py_DECREF(type);

Py_DECREF(value);

recursion_depth++;

if (recursion_depth == Py_NORMALIZE_RECURSION_LIMIT) {

PyErr_SetString(PyExc_RecursionError, "maximum recursion depth "

"exceeded while normalizing an exception");

}

/* If the new exception doesn't set a traceback and the old

exception had a traceback, use the old traceback for the

new exception. It's better than nothing.

*/

initial_tb = *tb;

PyErr_Fetch(exc, val, tb);

assert(*exc != NULL);

if (initial_tb != NULL) {

if (*tb == NULL)

*tb = initial_tb;

else

Py_DECREF(initial_tb);

}

/* Abort when Py_NORMALIZE_RECURSION_LIMIT has been exceeded, and the

corresponding RecursionError could not be normalized, and the

MemoryError raised when normalize this RecursionError could not be

normalized. */

if (recursion_depth >= Py_NORMALIZE_RECURSION_LIMIT + 2) {

if (PyErr_GivenExceptionMatches(*exc, PyExc_MemoryError)) {

Py_FatalError("Cannot recover from MemoryErrors "

"while normalizing exceptions.");

}

else {

Py_FatalError("Cannot recover from the recursive normalization "

"of an exception.");

}

}

goto restart;

}

void

PyErr_Fetch(PyObject **p_type, PyObject **p_value, PyObject **p_traceback)

{

PyThreadState *tstate = PyThreadState_GET();

*p_type = tstate->curexc_type;

*p_value = tstate->curexc_value;

*p_traceback = tstate->curexc_traceback;

tstate->curexc_type = NULL;

tstate->curexc_value = NULL;

tstate->curexc_traceback = NULL;

}

void

PyErr_Clear(void)

{

PyErr_Restore(NULL, NULL, NULL);

}

void

PyErr_GetExcInfo(PyObject **p_type, PyObject **p_value, PyObject **p_traceback)

{

PyThreadState *tstate = PyThreadState_GET();

_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);

*p_type = exc_info->exc_type;

*p_value = exc_info->exc_value;

*p_traceback = exc_info->exc_traceback;

Py_XINCREF(*p_type);

Py_XINCREF(*p_value);

Py_XINCREF(*p_traceback);

}

void

PyErr_SetExcInfo(PyObject *p_type, PyObject *p_value, PyObject *p_traceback)

{

PyObject *oldtype, *oldvalue, *oldtraceback;

PyThreadState *tstate = PyThreadState_GET();

oldtype = tstate->exc_info->exc_type;

oldvalue = tstate->exc_info->exc_value;

oldtraceback = tstate->exc_info->exc_traceback;

tstate->exc_info->exc_type = p_type;

tstate->exc_info->exc_value = p_value;

tstate->exc_info->exc_traceback = p_traceback;

Py_XDECREF(oldtype);

Py_XDECREF(oldvalue);

Py_XDECREF(oldtraceback);

}

/* Like PyErr_Restore(), but if an exception is already set,

set the context associated with it.

*/

void

_PyErr_ChainExceptions(PyObject *exc, PyObject *val, PyObject *tb)

{

if (exc == NULL)

return;

if (PyErr_Occurred()) {

PyObject *exc2, *val2, *tb2;

PyErr_Fetch(&exc2, &val2, &tb2);

PyErr_NormalizeException(&exc, &val, &tb);

if (tb != NULL) {

PyException_SetTraceback(val, tb);

Py_DECREF(tb);

}

Py_DECREF(exc);

PyErr_NormalizeException(&exc2, &val2, &tb2);

PyException_SetContext(val2, val);

PyErr_Restore(exc2, val2, tb2);

}

else {

PyErr_Restore(exc, val, tb);

}

}

static PyObject *

_PyErr_FormatVFromCause(PyObject *exception, const char *format, va_list vargs)

{

PyObject *exc, *val, *val2, *tb;

assert(PyErr_Occurred());

PyErr_Fetch(&exc, &val, &tb);

PyErr_NormalizeException(&exc, &val, &tb);

if (tb != NULL) {

PyException_SetTraceback(val, tb);

Py_DECREF(tb);

}

Py_DECREF(exc);

assert(!PyErr_Occurred());

PyErr_FormatV(exception, format, vargs);

PyErr_Fetch(&exc, &val2, &tb);

PyErr_NormalizeException(&exc, &val2, &tb);

Py_INCREF(val);

PyException_SetCause(val2, val);

PyException_SetContext(val2, val);

PyErr_Restore(exc, val2, tb);

return NULL;

}

PyObject *

_PyErr_FormatFromCause(PyObject *exception, const char *format, ...)

{

va_list vargs;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(vargs, format);

#else

va_start(vargs);

#endif

_PyErr_FormatVFromCause(exception, format, vargs);

va_end(vargs);

return NULL;

}

/* Convenience functions to set a type error exception and return 0 */

int

PyErr_BadArgument(void)

{

PyErr_SetString(PyExc_TypeError,

"bad argument type for built-in operation");

return 0;

}

PyObject *

PyErr_NoMemory(void)

{

if (Py_TYPE(PyExc_MemoryError) == NULL) {

/* PyErr_NoMemory() has been called before PyExc_MemoryError has been

initialized by _PyExc_Init() */

Py_FatalError("Out of memory and PyExc_MemoryError is not "

"initialized yet");

}

PyErr_SetNone(PyExc_MemoryError);

return NULL;

}

PyObject *

PyErr_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)

{

return PyErr_SetFromErrnoWithFilenameObjects(exc, filenameObject, NULL);

}

PyObject *

PyErr_SetFromErrnoWithFilenameObjects(PyObject *exc, PyObject *filenameObject, PyObject *filenameObject2)

{

PyObject *message;

PyObject *v, *args;

int i = errno;

#ifdef MS_WINDOWS

WCHAR *s_buf = NULL;

#endif /* Unix/Windows */

#ifdef EINTR

if (i == EINTR && PyErr_CheckSignals())

return NULL;

#endif

#ifndef MS_WINDOWS

if (i != 0) {

char *s = strerror(i);

message = PyUnicode_DecodeLocale(s, "surrogateescape");

}

else {

/* Sometimes errno didn't get set */

message = PyUnicode_FromString("Error");

}

#else

if (i == 0)

message = PyUnicode_FromString("Error"); /* Sometimes errno didn't get set */

else

{

/* Note that the Win32 errors do not lineup with the

errno error. So if the error is in the MSVC error

table, we use it, otherwise we assume it really _is_

a Win32 error code

*/

if (i > 0 && i < _sys_nerr) {

message = PyUnicode_FromString(_sys_errlist[i]);

}

else {

int len = FormatMessageW(

FORMAT_MESSAGE_ALLOCATE_BUFFER |

FORMAT_MESSAGE_FROM_SYSTEM |

FORMAT_MESSAGE_IGNORE_INSERTS,

NULL, /* no message source */

i,

MAKELANGID(LANG_NEUTRAL,

SUBLANG_DEFAULT),

/* Default language */

(LPWSTR) &s_buf,

0, /* size not used */

NULL); /* no args */

if (len==0) {

/* Only ever seen this in out-of-mem

situations */

s_buf = NULL;

message = PyUnicode_FromFormat("Windows Error 0x%x", i);

} else {

/* remove trailing cr/lf and dots */

while (len > 0 && (s_buf[len-1] <= L' ' || s_buf[len-1] == L'.'))

s_buf[--len] = L'\0';

message = PyUnicode_FromWideChar(s_buf, len);

}

}

}

#endif /* Unix/Windows */

if (message == NULL)

{

#ifdef MS_WINDOWS

LocalFree(s_buf);

#endif

return NULL;

}

if (filenameObject != NULL) {

if (filenameObject2 != NULL)

args = Py_BuildValue("(iOOiO)", i, message, filenameObject, 0, filenameObject2);

else

args = Py_BuildValue("(iOO)", i, message, filenameObject);

} else {

assert(filenameObject2 == NULL);

args = Py_BuildValue("(iO)", i, message);

}

Py_DECREF(message);

if (args != NULL) {

v = PyObject_Call(exc, args, NULL);

Py_DECREF(args);

if (v != NULL) {

PyErr_SetObject((PyObject *) Py_TYPE(v), v);

Py_DECREF(v);

}

}

#ifdef MS_WINDOWS

LocalFree(s_buf);

#endif

return NULL;

}

PyObject *

PyErr_SetFromErrnoWithFilename(PyObject *exc, const char *filename)

{

PyObject *name = filename ? PyUnicode_DecodeFSDefault(filename) : NULL;

PyObject *result = PyErr_SetFromErrnoWithFilenameObjects(exc, name, NULL);

Py_XDECREF(name);

return result;

}

#ifdef MS_WINDOWS

PyObject *

PyErr_SetFromErrnoWithUnicodeFilename(PyObject *exc, const Py_UNICODE *filename)

{

PyObject *name = filename ? PyUnicode_FromWideChar(filename, -1) : NULL;

PyObject *result = PyErr_SetFromErrnoWithFilenameObjects(exc, name, NULL);

Py_XDECREF(name);

return result;

}

#endif /* MS_WINDOWS */

PyObject *

PyErr_SetFromErrno(PyObject *exc)

{

return PyErr_SetFromErrnoWithFilenameObjects(exc, NULL, NULL);

}

#ifdef MS_WINDOWS

/* Windows specific error code handling */

PyObject *PyErr_SetExcFromWindowsErrWithFilenameObject(

PyObject *exc,

int ierr,

PyObject *filenameObject)

{

return PyErr_SetExcFromWindowsErrWithFilenameObjects(exc, ierr,

filenameObject, NULL);

}

PyObject *PyErr_SetExcFromWindowsErrWithFilenameObjects(

PyObject *exc,

int ierr,

PyObject *filenameObject,

PyObject *filenameObject2)

{

int len;

WCHAR *s_buf = NULL; /* Free via LocalFree */

PyObject *message;

PyObject *args, *v;

DWORD err = (DWORD)ierr;

if (err==0) err = GetLastError();

len = FormatMessageW(

/* Error API error */

FORMAT_MESSAGE_ALLOCATE_BUFFER |

FORMAT_MESSAGE_FROM_SYSTEM |

FORMAT_MESSAGE_IGNORE_INSERTS,

NULL, /* no message source */

err,

MAKELANGID(LANG_NEUTRAL,

SUBLANG_DEFAULT), /* Default language */

(LPWSTR) &s_buf,

0, /* size not used */

NULL); /* no args */

if (len==0) {

/* Only seen this in out of mem situations */

message = PyUnicode_FromFormat("Windows Error 0x%x", err);

s_buf = NULL;

} else {

/* remove trailing cr/lf and dots */

while (len > 0 && (s_buf[len-1] <= L' ' || s_buf[len-1] == L'.'))

s_buf[--len] = L'\0';

message = PyUnicode_FromWideChar(s_buf, len);

}

if (message == NULL)

{

LocalFree(s_buf);

return NULL;

}

if (filenameObject == NULL) {

assert(filenameObject2 == NULL);

filenameObject = filenameObject2 = Py_None;

}

else if (filenameObject2 == NULL)

filenameObject2 = Py_None;

/* This is the constructor signature for OSError.

The POSIX translation will be figured out by the constructor. */

args = Py_BuildValue("(iOOiO)", 0, message, filenameObject, err, filenameObject2);

Py_DECREF(message);

if (args != NULL) {

v = PyObject_Call(exc, args, NULL);

Py_DECREF(args);

if (v != NULL) {

PyErr_SetObject((PyObject *) Py_TYPE(v), v);

Py_DECREF(v);

}

}

LocalFree(s_buf);

return NULL;

}

PyObject *PyErr_SetExcFromWindowsErrWithFilename(

PyObject *exc,

int ierr,

const char *filename)

{

PyObject *name = filename ? PyUnicode_DecodeFSDefault(filename) : NULL;

PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObjects(exc,

ierr,

name,

NULL);

Py_XDECREF(name);

return ret;

}

PyObject *PyErr_SetExcFromWindowsErrWithUnicodeFilename(

PyObject *exc,

int ierr,

const Py_UNICODE *filename)

{

PyObject *name = filename ? PyUnicode_FromWideChar(filename, -1) : NULL;

PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObjects(exc,

ierr,

name,

NULL);

Py_XDECREF(name);

return ret;

}

PyObject *PyErr_SetExcFromWindowsErr(PyObject *exc, int ierr)

{

return PyErr_SetExcFromWindowsErrWithFilename(exc, ierr, NULL);

}

PyObject *PyErr_SetFromWindowsErr(int ierr)

{

return PyErr_SetExcFromWindowsErrWithFilename(PyExc_OSError,

ierr, NULL);

}

PyObject *PyErr_SetFromWindowsErrWithFilename(

int ierr,

const char *filename)

{

PyObject *name = filename ? PyUnicode_DecodeFSDefault(filename) : NULL;

PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObjects(

PyExc_OSError,

ierr, name, NULL);

Py_XDECREF(name);

return result;

}

PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(

int ierr,

const Py_UNICODE *filename)

{

PyObject *name = filename ? PyUnicode_FromWideChar(filename, -1) : NULL;

PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObjects(

PyExc_OSError,

ierr, name, NULL);

Py_XDECREF(name);

return result;

}

#endif /* MS_WINDOWS */

PyObject *

PyErr_SetImportErrorSubclass(PyObject *exception, PyObject *msg,

PyObject *name, PyObject *path)

{

int issubclass;

PyObject *kwargs, *error;

issubclass = PyObject_IsSubclass(exception, PyExc_ImportError);

if (issubclass < 0) {

return NULL;

}

else if (!issubclass) {

PyErr_SetString(PyExc_TypeError, "expected a subclass of ImportError");

return NULL;

}

if (msg == NULL) {

PyErr_SetString(PyExc_TypeError, "expected a message argument");

return NULL;

}

if (name == NULL) {

name = Py_None;

}

if (path == NULL) {

path = Py_None;

}

kwargs = PyDict_New();

if (kwargs == NULL) {

return NULL;

}

if (PyDict_SetItemString(kwargs, "name", name) < 0) {

goto done;

}

if (PyDict_SetItemString(kwargs, "path", path) < 0) {

goto done;

}

error = _PyObject_FastCallDict(exception, &msg, 1, kwargs);

if (error != NULL) {

PyErr_SetObject((PyObject *)Py_TYPE(error), error);

Py_DECREF(error);

}

done:

Py_DECREF(kwargs);

return NULL;

}

PyObject *

PyErr_SetImportError(PyObject *msg, PyObject *name, PyObject *path)

{

return PyErr_SetImportErrorSubclass(PyExc_ImportError, msg, name, path);

}

void

_PyErr_BadInternalCall(const char *filename, int lineno)

{

PyErr_Format(PyExc_SystemError,

"%s:%d: bad argument to internal function",

filename, lineno);

}

/* Remove the preprocessor macro for PyErr_BadInternalCall() so that we can

export the entry point for existing object code: */

#undef PyErr_BadInternalCall

void

PyErr_BadInternalCall(void)

{

assert(0 && "bad argument to internal function");

PyErr_Format(PyExc_SystemError,

"bad argument to internal function");

}

#define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)

PyObject *

PyErr_FormatV(PyObject *exception, const char *format, va_list vargs)

{

PyObject* string;

/* Issue #23571: PyUnicode_FromFormatV() must not be called with an

exception set, it calls arbitrary Python code like PyObject_Repr() */

PyErr_Clear();

string = PyUnicode_FromFormatV(format, vargs);

PyErr_SetObject(exception, string);

Py_XDECREF(string);

return NULL;

}

PyObject *

PyErr_Format(PyObject *exception, const char *format, ...)

{

va_list vargs;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(vargs, format);

#else

va_start(vargs);

#endif

PyErr_FormatV(exception, format, vargs);

va_end(vargs);

return NULL;

}

PyObject *

PyErr_NewException(const char *name, PyObject *base, PyObject *dict)

{

const char *dot;

PyObject *modulename = NULL;

PyObject *classname = NULL;

PyObject *mydict = NULL;

PyObject *bases = NULL;

PyObject *result = NULL;

dot = strrchr(name, '.');

if (dot == NULL) {

PyErr_SetString(PyExc_SystemError,

"PyErr_NewException: name must be module.class");

return NULL;

}

if (base == NULL)

base = PyExc_Exception;

if (dict == NULL) {

dict = mydict = PyDict_New();

if (dict == NULL)

goto failure;

}

if (PyDict_GetItemString(dict, "__module__") == NULL) {

modulename = PyUnicode_FromStringAndSize(name,

(Py_ssize_t)(dot-name));

if (modulename == NULL)

goto failure;

if (PyDict_SetItemString(dict, "__module__", modulename) != 0)

goto failure;

}

if (PyTuple_Check(base)) {

bases = base;

/* INCREF as we create a new ref in the else branch */

Py_INCREF(bases);

} else {

bases = PyTuple_Pack(1, base);

if (bases == NULL)

goto failure;

}

/* Create a real class. */

result = PyObject_CallFunction((PyObject *)&PyType_Type, "sOO",

dot+1, bases, dict);

failure:

Py_XDECREF(bases);

Py_XDECREF(mydict);

Py_XDECREF(classname);

Py_XDECREF(modulename);

return result;

}

/* Create an exception with docstring */

PyObject *

PyErr_NewExceptionWithDoc(const char *name, const char *doc,

PyObject *base, PyObject *dict)

{

int result;

PyObject *ret = NULL;

PyObject *mydict = NULL; /* points to the dict only if we create it */

PyObject *docobj;

if (dict == NULL) {

dict = mydict = PyDict_New();

if (dict == NULL) {

return NULL;

}

}

if (doc != NULL) {

docobj = PyUnicode_FromString(doc);

if (docobj == NULL)

goto failure;

result = PyDict_SetItemString(dict, "__doc__", docobj);

Py_DECREF(docobj);

if (result < 0)

goto failure;

}

ret = PyErr_NewException(name, base, dict);

failure:

Py_XDECREF(mydict);

return ret;

}

/* Call when an exception has occurred but there is no way for Python

to handle it. Examples: exception in __del__ or during GC. */

void

PyErr_WriteUnraisable(PyObject *obj)

{

_Py_IDENTIFIER(__module__);

PyObject *f, *t, *v, *tb;

PyObject *moduleName = NULL;

const char *className;

PyErr_Fetch(&t, &v, &tb);

f = _PySys_GetObjectId(&PyId_stderr);

if (f == NULL || f == Py_None)

goto done;

if (obj) {

if (PyFile_WriteString("Exception ignored in: ", f) < 0)

goto done;

if (PyFile_WriteObject(obj, f, 0) < 0) {

PyErr_Clear();

if (PyFile_WriteString("<object repr() failed>", f) < 0) {

goto done;

}

}

if (PyFile_WriteString("\n", f) < 0)

goto done;

}

if (PyTraceBack_Print(tb, f) < 0)

goto done;

if (!t)

goto done;

assert(PyExceptionClass_Check(t));

className = PyExceptionClass_Name(t);

if (className != NULL) {

const char *dot = strrchr(className, '.');

if (dot != NULL)

className = dot+1;

}

moduleName = _PyObject_GetAttrId(t, &PyId___module__);

if (moduleName == NULL || !PyUnicode_Check(moduleName)) {

PyErr_Clear();

if (PyFile_WriteString("<unknown>", f) < 0)

goto done;

}

else {

if (!_PyUnicode_EqualToASCIIId(moduleName, &PyId_builtins)) {

if (PyFile_WriteObject(moduleName, f, Py_PRINT_RAW) < 0)

goto done;

if (PyFile_WriteString(".", f) < 0)

goto done;

}

}

if (className == NULL) {

if (PyFile_WriteString("<unknown>", f) < 0)