cpython/Python/errors.c at 4591dae421cc1415bcf982cccbf5de4f787df030 · python/cpython · GitHub

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/* Error handling */

#include "Python.h"

#include "pycore_call.h" // _PyObject_CallNoArgs()

#include "pycore_initconfig.h" // _PyStatus_ERR()

#include "pycore_pyerrors.h" // _PyErr_Format()

#include "pycore_pystate.h" // _PyThreadState_GET()

#include "pycore_structseq.h" // _PyStructSequence_FiniType()

#include "pycore_sysmodule.h" // _PySys_Audit()

#include "pycore_traceback.h" // _PyTraceBack_FromFrame()

#include <ctype.h>

#ifdef MS_WINDOWS

# include <windows.h>

# include <winbase.h>

# include <stdlib.h> // _sys_nerr

#endif

#ifdef __cplusplus

extern "C" {

#endif

/* Forward declarations */

static PyObject *

_PyErr_FormatV(PyThreadState *tstate, PyObject *exception,

const char *format, va_list vargs);

void

_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value,

PyObject *traceback)

{

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);

}

void

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

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_Restore(tstate, type, value, traceback);

}

_PyErr_StackItem *

_PyErr_GetTopmostException(PyThreadState *tstate)

{

_PyErr_StackItem *exc_info = tstate->exc_info;

assert(exc_info);

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

exc_info->previous_item != NULL)

{

exc_info = exc_info->previous_item;

}

return exc_info;

}

static PyObject*

_PyErr_CreateException(PyObject *exception_type, PyObject *value)

{

PyObject *exc;

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

exc = _PyObject_CallNoArgs(exception_type);

}

else if (PyTuple_Check(value)) {

exc = PyObject_Call(exception_type, value, NULL);

}

else {

exc = PyObject_CallOneArg(exception_type, value);

}

if (exc != NULL && !PyExceptionInstance_Check(exc)) {

PyErr_Format(PyExc_TypeError,

"calling %R should have returned an instance of "

"BaseException, not %s",

exception_type, Py_TYPE(exc)->tp_name);

Py_CLEAR(exc);

}

return exc;

}

void

_PyErr_SetObject(PyThreadState *tstate, PyObject *exception, PyObject *value)

{

PyObject *exc_value;

PyObject *tb = NULL;

if (exception != NULL &&

!PyExceptionClass_Check(exception)) {

_PyErr_Format(tstate, PyExc_SystemError,

"_PyErr_SetObject: "

"exception %R is 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(tstate);

fixed_value = _PyErr_CreateException(exception, value);

Py_XDECREF(value);

if (fixed_value == NULL) {

Py_DECREF(exc_value);

return;

}

value = fixed_value;

}

/* Avoid creating new reference cycles through the

context chain, while taking care not to hang on

pre-existing ones.

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;

PyObject *slow_o = o; /* Floyd's cycle detection algo */

int slow_update_toggle = 0;

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

Py_DECREF(context);

if (context == value) {

PyException_SetContext(o, NULL);

break;

}

o = context;

if (o == slow_o) {

/* pre-existing cycle - all exceptions on the

path were visited and checked. */

break;

}

if (slow_update_toggle) {

slow_o = PyException_GetContext(slow_o);

Py_DECREF(slow_o);

}

slow_update_toggle = !slow_update_toggle;

}

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(tstate, exception, value, tb);

}

void

PyErr_SetObject(PyObject *exception, PyObject *value)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_SetObject(tstate, exception, value);

}

/* 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)

{

PyThreadState *tstate = _PyThreadState_GET();

PyObject *tup = PyTuple_Pack(1, arg);

if (!tup) {

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

return;

}

_PyErr_SetObject(tstate, PyExc_KeyError, tup);

Py_DECREF(tup);

}

void

_PyErr_SetNone(PyThreadState *tstate, PyObject *exception)

{

_PyErr_SetObject(tstate, exception, (PyObject *)NULL);

}

void

PyErr_SetNone(PyObject *exception)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_SetNone(tstate, exception);

}

void

_PyErr_SetString(PyThreadState *tstate, PyObject *exception,

const char *string)

{

PyObject *value = PyUnicode_FromString(string);

_PyErr_SetObject(tstate, exception, value);

Py_XDECREF(value);

}

void

PyErr_SetString(PyObject *exception, const char *string)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_SetString(tstate, exception, string);

}

PyObject* _Py_HOT_FUNCTION

PyErr_Occurred(void)

{

/* The caller must hold the GIL. */

assert(PyGILState_Check());

PyThreadState *tstate = _PyThreadState_GET();

return _PyErr_Occurred(tstate);

}

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(PyThreadState *tstate, PyObject *exc)

{

return PyErr_GivenExceptionMatches(_PyErr_Occurred(tstate), exc);

}

int

PyErr_ExceptionMatches(PyObject *exc)

{

PyThreadState *tstate = _PyThreadState_GET();

return _PyErr_ExceptionMatches(tstate, 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(PyThreadState *tstate, PyObject **exc,

PyObject **val, PyObject **tb)

{

int recursion_depth = 0;

tstate->recursion_headroom++;

PyObject *type, *value, *initial_tb;

restart:

type = *exc;

if (type == NULL) {

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

tstate->recursion_headroom--;

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;

tstate->recursion_headroom--;

return;

error:

Py_DECREF(type);

Py_DECREF(value);

recursion_depth++;

if (recursion_depth == Py_NORMALIZE_RECURSION_LIMIT) {

_PyErr_SetString(tstate, 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(tstate, 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_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_NormalizeException(tstate, exc, val, tb);

}

void

_PyErr_Fetch(PyThreadState *tstate, PyObject **p_type, PyObject **p_value,

PyObject **p_traceback)

{

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

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_Fetch(tstate, p_type, p_value, p_traceback);

}

void

_PyErr_Clear(PyThreadState *tstate)

{

_PyErr_Restore(tstate, NULL, NULL, NULL);

}

void

PyErr_Clear(void)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_Clear(tstate);

}

static PyObject*

get_exc_type(PyObject *exc_value) /* returns a borrowed ref */

{

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

return Py_None;

}

else {

assert(PyExceptionInstance_Check(exc_value));

PyObject *type = PyExceptionInstance_Class(exc_value);

assert(type != NULL);

return type;

}

static PyObject*

get_exc_traceback(PyObject *exc_value) /* returns a borrowed ref */

{

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

return Py_None;

}

else {

assert(PyExceptionInstance_Check(exc_value));

PyObject *tb = PyException_GetTraceback(exc_value);

Py_XDECREF(tb);

return tb ? tb : Py_None;

}

void

_PyErr_GetExcInfo(PyThreadState *tstate,

PyObject **p_type, PyObject **p_value, PyObject **p_traceback)

{

_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);

*p_type = get_exc_type(exc_info->exc_value);

*p_value = exc_info->exc_value;

*p_traceback = get_exc_traceback(exc_info->exc_value);

Py_XINCREF(*p_type);

Py_XINCREF(*p_value);

Py_XINCREF(*p_traceback);

}

PyObject*

_PyErr_GetHandledException(PyThreadState *tstate)

{

_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);

PyObject *exc = exc_info->exc_value;

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

return NULL;

}

return Py_NewRef(exc);

}

PyObject*

PyErr_GetHandledException(void)

{

PyThreadState *tstate = _PyThreadState_GET();

return _PyErr_GetHandledException(tstate);

}

void

_PyErr_SetHandledException(PyThreadState *tstate, PyObject *exc)

{

Py_XSETREF(tstate->exc_info->exc_value, Py_XNewRef(exc));

}

void

PyErr_SetHandledException(PyObject *exc)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_SetHandledException(tstate, exc);

}

void

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

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_GetExcInfo(tstate, p_type, p_value, p_traceback);

}

void

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

{

PyErr_SetHandledException(value);

Py_XDECREF(value);

/* These args are no longer used, but we still need to steal a ref */

Py_XDECREF(type);

Py_XDECREF(traceback);

}

PyObject*

_PyErr_StackItemToExcInfoTuple(_PyErr_StackItem *err_info)

{

PyObject *exc_value = err_info->exc_value;

assert(exc_value == NULL ||

exc_value == Py_None ||

PyExceptionInstance_Check(exc_value));

PyObject *exc_type = get_exc_type(exc_value);

PyObject *exc_traceback = get_exc_traceback(exc_value);

return Py_BuildValue(

"(OOO)",

exc_type ? exc_type : Py_None,

exc_value ? exc_value : Py_None,

exc_traceback ? exc_traceback : Py_None);

}

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

set the context associated with it.

The caller is responsible for ensuring that this call won't create

any cycles in the exception context chain. */

void

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

{

if (typ == NULL)

return;

PyThreadState *tstate = _PyThreadState_GET();

if (!PyExceptionClass_Check(typ)) {

_PyErr_Format(tstate, PyExc_SystemError,

"_PyErr_ChainExceptions: "

"exception %R is not a BaseException subclass",

typ);

return;

}

if (_PyErr_Occurred(tstate)) {

PyObject *typ2, *val2, *tb2;

_PyErr_Fetch(tstate, &typ2, &val2, &tb2);

_PyErr_NormalizeException(tstate, &typ, &val, &tb);

if (tb != NULL) {

PyException_SetTraceback(val, tb);

Py_DECREF(tb);

}

Py_DECREF(typ);

_PyErr_NormalizeException(tstate, &typ2, &val2, &tb2);

PyException_SetContext(val2, val);

_PyErr_Restore(tstate, typ2, val2, tb2);

}

else {

_PyErr_Restore(tstate, typ, val, tb);

}

/* Set the currently set exception's context to the given exception.

If the provided exc_info is NULL, then the current Python thread state's

exc_info will be used for the context instead.

This function can only be called when _PyErr_Occurred() is true.

Also, this function won't create any cycles in the exception context

chain to the extent that _PyErr_SetObject ensures this. */

void

_PyErr_ChainStackItem(_PyErr_StackItem *exc_info)

{

PyThreadState *tstate = _PyThreadState_GET();

assert(_PyErr_Occurred(tstate));

int exc_info_given;

if (exc_info == NULL) {

exc_info_given = 0;

exc_info = tstate->exc_info;

} else {

exc_info_given = 1;

}

if (exc_info->exc_value == NULL || exc_info->exc_value == Py_None) {

return;

}

_PyErr_StackItem *saved_exc_info;

if (exc_info_given) {

/* Temporarily set the thread state's exc_info since this is what

_PyErr_SetObject uses for implicit exception chaining. */

saved_exc_info = tstate->exc_info;

tstate->exc_info = exc_info;

}

PyObject *typ, *val, *tb;

_PyErr_Fetch(tstate, &typ, &val, &tb);

/* _PyErr_SetObject sets the context from PyThreadState. */

_PyErr_SetObject(tstate, typ, val);

Py_DECREF(typ); // since _PyErr_Occurred was true

Py_XDECREF(val);

Py_XDECREF(tb);

if (exc_info_given) {

tstate->exc_info = saved_exc_info;

}

static PyObject *

_PyErr_FormatVFromCause(PyThreadState *tstate, PyObject *exception,

const char *format, va_list vargs)

{

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

assert(_PyErr_Occurred(tstate));

_PyErr_Fetch(tstate, &exc, &val, &tb);

_PyErr_NormalizeException(tstate, &exc, &val, &tb);

if (tb != NULL) {

PyException_SetTraceback(val, tb);

Py_DECREF(tb);

}

Py_DECREF(exc);

assert(!_PyErr_Occurred(tstate));

_PyErr_FormatV(tstate, exception, format, vargs);

_PyErr_Fetch(tstate, &exc, &val2, &tb);

_PyErr_NormalizeException(tstate, &exc, &val2, &tb);

Py_INCREF(val);

PyException_SetCause(val2, val);

PyException_SetContext(val2, val);

_PyErr_Restore(tstate, exc, val2, tb);

return NULL;

}

PyObject *

_PyErr_FormatFromCauseTstate(PyThreadState *tstate, PyObject *exception,

const char *format, ...)

{

va_list vargs;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(vargs, format);

#else

va_start(vargs);

#endif

_PyErr_FormatVFromCause(tstate, exception, format, vargs);

va_end(vargs);

return NULL;

}

PyObject *

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

{

PyThreadState *tstate = _PyThreadState_GET();

va_list vargs;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(vargs, format);

#else

va_start(vargs);

#endif

_PyErr_FormatVFromCause(tstate, exception, format, vargs);

va_end(vargs);

return NULL;

}

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

int

PyErr_BadArgument(void)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_SetString(tstate, PyExc_TypeError,

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

return 0;

}

PyObject *

_PyErr_NoMemory(PyThreadState *tstate)

{

if (Py_IS_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(tstate, PyExc_MemoryError);

return NULL;

}

PyObject *

PyErr_NoMemory(void)

{

PyThreadState *tstate = _PyThreadState_GET();

return _PyErr_NoMemory(tstate);

}

PyObject *

PyErr_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)

{

return PyErr_SetFromErrnoWithFilenameObjects(exc, filenameObject, NULL);

}

PyObject *

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

{

PyThreadState *tstate = _PyThreadState_GET();

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) {

const 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 */

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(tstate, (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;

}

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)

{

PyThreadState *tstate = _PyThreadState_GET();

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(tstate, (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_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;

}

#endif /* MS_WINDOWS */

PyObject *

PyErr_SetImportErrorSubclass(PyObject *exception, PyObject *msg,

PyObject *name, PyObject *path)

{

PyThreadState *tstate = _PyThreadState_GET();

int issubclass;

PyObject *kwargs, *error;

issubclass = PyObject_IsSubclass(exception, PyExc_ImportError);

if (issubclass < 0) {

return NULL;

}

else if (!issubclass) {

_PyErr_SetString(tstate, PyExc_TypeError,

"expected a subclass of ImportError");

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cpython/Python/errors.c at 4591dae421cc1415bcf982cccbf5de4f787df030 · python/cpython · GitHub

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