Python/errors.c - platform/external/python/cpython2 - Gitiles


 /* Error handling */

 #include "Python.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


 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);
 }

 void
 PyErr_SetObject(PyObject *exception, PyObject *value)
 {
 	Py_XINCREF(exception);
 	Py_XINCREF(value);
 	PyErr_Restore(exception, value, (PyObject *)NULL);
 }

 void
 PyErr_SetNone(PyObject *exception)
 {
 	PyErr_SetObject(exception, (PyObject *)NULL);
 }

 void
 PyErr_SetString(PyObject *exception, const char *string)
 {
 	PyObject *value = PyBytes_FromString(string);
 	PyErr_SetObject(exception, value);
 	Py_XDECREF(value);
 }


 PyObject *
 PyErr_Occurred(void)
 {
 	PyThreadState *tstate = PyThreadState_GET();

 	return 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)) {
 		/* problems here!?  not sure PyObject_IsSubclass expects to
 		   be called with an exception pending... */
 		return PyObject_IsSubclass(err, exc);
 	}

 	return err == exc;
 }


 int
 PyErr_ExceptionMatches(PyObject *exc)
 {
 	return PyErr_GivenExceptionMatches(PyErr_Occurred(), exc);
 }


 /* Used in many places to normalize a raised exception, including in
    eval_code2(), do_raise(), and PyErr_Print()
 */
 void
 PyErr_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)
 {
 	PyObject *type = *exc;
 	PyObject *value = *val;
 	PyObject *inclass = NULL;
 	PyObject *initial_tb = NULL;
 	PyThreadState *tstate = NULL;

 	if (type == NULL) {
 		/* There was no exception, so nothing to do. */
 		return;
 	}

 	/* If PyErr_SetNone() was used, the value will have been actually
 	   set to NULL.
 	*/
 	if (!value) {
 		value = Py_None;
 		Py_INCREF(value);
 	}

 	if (PyExceptionInstance_Check(value))
 		inclass = PyExceptionInstance_Class(value);

 	/* Normalize the exception so that if the type is a class, the
 	   value will be an instance.
 	*/
 	if (PyExceptionClass_Check(type)) {
 		/* 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 (!inclass || !PyObject_IsSubclass(inclass, type)) {
 			PyObject *args, *res;

 			if (value == Py_None)
 				args = PyTuple_New(0);
 			else if (PyTuple_Check(value)) {
 				Py_INCREF(value);
 				args = value;
 			}
 			else
 				args = PyTuple_Pack(1, value);

 			if (args == NULL)
 				goto finally;
 			res = PyEval_CallObject(type, args);
 			Py_DECREF(args);
 			if (res == NULL)
 				goto finally;
 			Py_DECREF(value);
 			value = res;
 		}
 		/* if the class of the instance doesn't exactly match the
 		   class of the type, believe the instance
 		*/
 		else if (inclass != type) {
  			Py_DECREF(type);
 			type = inclass;
 			Py_INCREF(type);
 		}
 	}
 	*exc = type;
 	*val = value;
 	return;
 finally:
 	Py_DECREF(type);
 	Py_DECREF(value);
 	/* 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);
 	if (initial_tb != NULL) {
 		if (*tb == NULL)
 			*tb = initial_tb;
 		else
 			Py_DECREF(initial_tb);
 	}
 	/* normalize recursively */
 	tstate = PyThreadState_GET();
 	if (++tstate->recursion_depth > Py_GetRecursionLimit()) {
 	    --tstate->recursion_depth;
 	    PyErr_SetObject(PyExc_RuntimeError, PyExc_RecursionErrorInst);
 	    return;
 	}
 	PyErr_NormalizeException(exc, val, tb);
 	--tstate->recursion_depth;
 }


 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);
 }

 /* 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 (PyErr_ExceptionMatches(PyExc_MemoryError))
 		/* already current */
 		return NULL;

 	/* raise the pre-allocated instance if it still exists */
 	if (PyExc_MemoryErrorInst)
 		PyErr_SetObject(PyExc_MemoryError, PyExc_MemoryErrorInst);
 	else
 		/* this will probably fail since there's no memory and hee,
 		   hee, we have to instantiate this class
 		*/
 		PyErr_SetNone(PyExc_MemoryError);

 	return NULL;
 }

 PyObject *
 PyErr_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)
 {
 	PyObject *v;
 	char *s;
 	int i = errno;
 #ifdef PLAN9
 	char errbuf[ERRMAX];
 #endif
 #ifdef MS_WINDOWS
 	char *s_buf = NULL;
 	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */
 #endif
 #ifdef EINTR
 	if (i == EINTR && PyErr_CheckSignals())
 		return NULL;
 #endif
 #ifdef PLAN9
 	rerrstr(errbuf, sizeof errbuf);
 	s = errbuf;
 #else
 	if (i == 0)
 		s = "Error"; /* Sometimes errno didn't get set */
 	else
 #ifndef MS_WINDOWS
 		s = strerror(i);
 #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) {
 			s = _sys_errlist[i];
 		}
 		else {
 			int len = FormatMessage(
 				FORMAT_MESSAGE_ALLOCATE_BUFFER |
 				FORMAT_MESSAGE_FROM_SYSTEM |
 				FORMAT_MESSAGE_IGNORE_INSERTS,
 				NULL,	/* no message source */
 				i,
 				MAKELANGID(LANG_NEUTRAL,
 					   SUBLANG_DEFAULT),
 				           /* Default language */
 				(LPTSTR) &s_buf,
 				0,	/* size not used */
 				NULL);	/* no args */
 			if (len==0) {
 				/* Only ever seen this in out-of-mem
 				   situations */
 				sprintf(s_small_buf, "Windows Error 0x%X", i);
 				s = s_small_buf;
 				s_buf = NULL;
 			} else {
 				s = s_buf;
 				/* remove trailing cr/lf and dots */
 				while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))
 					s[--len] = '\0';
 			}
 		}
 	}
 #endif /* Unix/Windows */
 #endif /* PLAN 9*/
 	if (filenameObject != NULL)
 		v = Py_BuildValue("(isO)", i, s, filenameObject);
 	else
 		v = Py_BuildValue("(is)", i, s);
 	if (v != NULL) {
 		PyErr_SetObject(exc, v);
 		Py_DECREF(v);
 	}
 #ifdef MS_WINDOWS
 	LocalFree(s_buf);
 #endif
 	return NULL;
 }


 PyObject *
 PyErr_SetFromErrnoWithFilename(PyObject *exc, char *filename)
 {
 	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
 	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
 	Py_XDECREF(name);
 	return result;
 }

 #ifdef Py_WIN_WIDE_FILENAMES
 PyObject *
 PyErr_SetFromErrnoWithUnicodeFilename(PyObject *exc, Py_UNICODE *filename)
 {
 	PyObject *name = filename ?
 	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :
 	                 NULL;
 	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
 	Py_XDECREF(name);
 	return result;
 }
 #endif /* Py_WIN_WIDE_FILENAMES */

 PyObject *
 PyErr_SetFromErrno(PyObject *exc)
 {
 	return PyErr_SetFromErrnoWithFilenameObject(exc, NULL);
 }

 #ifdef MS_WINDOWS
 /* Windows specific error code handling */
 PyObject *PyErr_SetExcFromWindowsErrWithFilenameObject(
 	PyObject *exc,
 	int ierr,
 	PyObject *filenameObject)
 {
 	int len;
 	char *s;
 	char *s_buf = NULL; /* Free via LocalFree */
 	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */
 	PyObject *v;
 	DWORD err = (DWORD)ierr;
 	if (err==0) err = GetLastError();
 	len = FormatMessage(
 		/* 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 */
 		(LPTSTR) &s_buf,
 		0,	/* size not used */
 		NULL);	/* no args */
 	if (len==0) {
 		/* Only seen this in out of mem situations */
 		sprintf(s_small_buf, "Windows Error 0x%X", err);
 		s = s_small_buf;
 		s_buf = NULL;
 	} else {
 		s = s_buf;
 		/* remove trailing cr/lf and dots */
 		while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))
 			s[--len] = '\0';
 	}
 	if (filenameObject != NULL)
 		v = Py_BuildValue("(isO)", err, s, filenameObject);
 	else
 		v = Py_BuildValue("(is)", err, s);
 	if (v != NULL) {
 		PyErr_SetObject(exc, v);
 		Py_DECREF(v);
 	}
 	LocalFree(s_buf);
 	return NULL;
 }

 PyObject *PyErr_SetExcFromWindowsErrWithFilename(
 	PyObject *exc,
 	int ierr,
 	const char *filename)
 {
 	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
 	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,
 	                                                             ierr,
 	                                                             name);
 	Py_XDECREF(name);
 	return ret;
 }

 #ifdef Py_WIN_WIDE_FILENAMES
 PyObject *PyErr_SetExcFromWindowsErrWithUnicodeFilename(
 	PyObject *exc,
 	int ierr,
 	const Py_UNICODE *filename)
 {
 	PyObject *name = filename ?
 	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :
 	                 NULL;
 	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,
 	                                                             ierr,
 	                                                             name);
 	Py_XDECREF(name);
 	return ret;
 }
 #endif /* Py_WIN_WIDE_FILENAMES */

 PyObject *PyErr_SetExcFromWindowsErr(PyObject *exc, int ierr)
 {
 	return PyErr_SetExcFromWindowsErrWithFilename(exc, ierr, NULL);
 }

 PyObject *PyErr_SetFromWindowsErr(int ierr)
 {
 	return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,
 						      ierr, NULL);
 }
 PyObject *PyErr_SetFromWindowsErrWithFilename(
 	int ierr,
 	const char *filename)
 {
 	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
 	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
 						      PyExc_WindowsError,
 						      ierr, name);
 	Py_XDECREF(name);
 	return result;
 }

 #ifdef Py_WIN_WIDE_FILENAMES
 PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(
 	int ierr,
 	const Py_UNICODE *filename)
 {
 	PyObject *name = filename ?
 	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :
 	                 NULL;
 	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
 						      PyExc_WindowsError,
 						      ierr, name);
 	Py_XDECREF(name);
 	return result;
 }
 #endif /* Py_WIN_WIDE_FILENAMES */
 #endif /* MS_WINDOWS */

 void
 _PyErr_BadInternalCall(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)
 {
 	PyErr_Format(PyExc_SystemError,
 		     "bad argument to internal function");
 }
 #define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)


 PyObject *
 PyErr_Format(PyObject *exception, const char *format, ...)
 {
 	va_list vargs;
 	PyObject* string;

 #ifdef HAVE_STDARG_PROTOTYPES
 	va_start(vargs, format);
 #else
 	va_start(vargs);
 #endif

 	string = PyBytes_FromFormatV(format, vargs);
 	PyErr_SetObject(exception, string);
 	Py_XDECREF(string);
 	va_end(vargs);
 	return NULL;
 }


 PyObject *
 PyErr_NewException(char *name, PyObject *base, PyObject *dict)
 {
 	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 = PyBytes_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 new-style 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;
 }

 /* 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)
 {
 	PyObject *f, *t, *v, *tb;
 	PyErr_Fetch(&t, &v, &tb);
 	f = PySys_GetObject("stderr");
 	if (f != NULL) {
 		PyFile_WriteString("Exception ", f);
 		if (t) {
 			PyObject* moduleName;
 			char* className;
 			assert(PyExceptionClass_Check(t));
 			className = PyExceptionClass_Name(t);
 			if (className != NULL) {
 				char *dot = strrchr(className, '.');
 				if (dot != NULL)
 					className = dot+1;
 			}

 			moduleName = PyObject_GetAttrString(t, "__module__");
 			if (moduleName == NULL)
 				PyFile_WriteString("<unknown>", f);
 			else {
 				char* modstr = PyBytes_AsString(moduleName);
 				if (modstr &&
 				    strcmp(modstr, "exceptions") != 0)
 				{
 					PyFile_WriteString(modstr, f);
 					PyFile_WriteString(".", f);
 				}
 			}
 			if (className == NULL)
 				PyFile_WriteString("<unknown>", f);
 			else
 				PyFile_WriteString(className, f);
 			if (v && v != Py_None) {
 				PyFile_WriteString(": ", f);
 				PyFile_WriteObject(v, f, 0);
 			}
 			Py_XDECREF(moduleName);
 		}
 		PyFile_WriteString(" in ", f);
 		PyFile_WriteObject(obj, f, 0);
 		PyFile_WriteString(" ignored\n", f);
 		PyErr_Clear(); /* Just in case */
 	}
 	Py_XDECREF(t);
 	Py_XDECREF(v);
 	Py_XDECREF(tb);
 }

 extern PyObject *PyModule_GetWarningsModule(void);


 /* Set file and line information for the current exception.
    If the exception is not a SyntaxError, also sets additional attributes
    to make printing of exceptions believe it is a syntax error. */

 void
 PyErr_SyntaxLocation(const char *filename, int lineno)
 {
 	PyObject *exc, *v, *tb, *tmp;

 	/* add attributes for the line number and filename for the error */
 	PyErr_Fetch(&exc, &v, &tb);
 	PyErr_NormalizeException(&exc, &v, &tb);
 	/* XXX check that it is, indeed, a syntax error. It might not
 	 * be, though. */
 	tmp = PyInt_FromLong(lineno);
 	if (tmp == NULL)
 		PyErr_Clear();
 	else {
 		if (PyObject_SetAttrString(v, "lineno", tmp))
 			PyErr_Clear();
 		Py_DECREF(tmp);
 	}
 	if (filename != NULL) {
 		tmp = PyBytes_FromString(filename);
 		if (tmp == NULL)
 			PyErr_Clear();
 		else {
 			if (PyObject_SetAttrString(v, "filename", tmp))
 				PyErr_Clear();
 			Py_DECREF(tmp);
 		}

 		tmp = PyErr_ProgramText(filename, lineno);
 		if (tmp) {
 			if (PyObject_SetAttrString(v, "text", tmp))
 				PyErr_Clear();
 			Py_DECREF(tmp);
 		}
 	}
 	if (PyObject_SetAttrString(v, "offset", Py_None)) {
 		PyErr_Clear();
 	}
 	if (exc != PyExc_SyntaxError) {
 		if (!PyObject_HasAttrString(v, "msg")) {
 			tmp = PyObject_Str(v);
 			if (tmp) {
 				if (PyObject_SetAttrString(v, "msg", tmp))
 					PyErr_Clear();
 				Py_DECREF(tmp);
 			} else {
 				PyErr_Clear();
 			}
 		}
 		if (!PyObject_HasAttrString(v, "print_file_and_line")) {
 			if (PyObject_SetAttrString(v, "print_file_and_line",
 						   Py_None))
 				PyErr_Clear();
 		}
 	}
 	PyErr_Restore(exc, v, tb);
 }

 /* com_fetch_program_text will attempt to load the line of text that
    the exception refers to.  If it fails, it will return NULL but will
    not set an exception.

    XXX The functionality of this function is quite similar to the
    functionality in tb_displayline() in traceback.c.
 */

 PyObject *
 PyErr_ProgramText(const char *filename, int lineno)
 {
 	FILE *fp;
 	int i;
 	char linebuf[1000];

 	if (filename == NULL || *filename == '\0' || lineno <= 0)
 		return NULL;
 	fp = fopen(filename, "r" PY_STDIOTEXTMODE);
 	if (fp == NULL)
 		return NULL;
 	for (i = 0; i < lineno; i++) {
 		char *pLastChar = &linebuf[sizeof(linebuf) - 2];
 		do {
 			*pLastChar = '\0';
 			if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, fp, NULL) == NULL)
 				break;
 			/* fgets read *something*; if it didn't get as
 			   far as pLastChar, it must have found a newline
 			   or hit the end of the file; if pLastChar is \n,
 			   it obviously found a newline; else we haven't
 			   yet seen a newline, so must continue */
 		} while (*pLastChar != '\0' && *pLastChar != '\n');
 	}
 	fclose(fp);
 	if (i == lineno) {
 		char *p = linebuf;
 		while (*p == ' ' || *p == '\t' || *p == '\014')
 			p++;
 		return PyBytes_FromString(p);
 	}
 	return NULL;
 }

 #ifdef __cplusplus
 }
 #endif

	/* Error handling */

	#include "Python.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


	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);
	}

	void
	PyErr_SetObject(PyObject exception, PyObject value)
	{
	Py_XINCREF(exception);
	Py_XINCREF(value);
	PyErr_Restore(exception, value, (PyObject *)NULL);
	}

	void
	PyErr_SetNone(PyObject *exception)
	{
	PyErr_SetObject(exception, (PyObject *)NULL);
	}

	void
	PyErr_SetString(PyObject exception, const char string)
	{
	PyObject *value = PyBytes_FromString(string);
	PyErr_SetObject(exception, value);
	Py_XDECREF(value);
	}


	PyObject *
	PyErr_Occurred(void)
	{
	PyThreadState *tstate = PyThreadState_GET();

	return 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)) {
	/* problems here!? not sure PyObject_IsSubclass expects to
	be called with an exception pending... */
	return PyObject_IsSubclass(err, exc);
	}

	return err == exc;
	}


	int
	PyErr_ExceptionMatches(PyObject *exc)
	{
	return PyErr_GivenExceptionMatches(PyErr_Occurred(), exc);
	}


	/* Used in many places to normalize a raised exception, including in
	eval_code2(), do_raise(), and PyErr_Print()
	*/
	void
	PyErr_NormalizeException(PyObject exc, PyObject val, PyObject **tb)
	{
	PyObject type = exc;
	PyObject value = val;
	PyObject *inclass = NULL;
	PyObject *initial_tb = NULL;
	PyThreadState *tstate = NULL;

	if (type == NULL) {
	/* There was no exception, so nothing to do. */
	return;
	}

	/* If PyErr_SetNone() was used, the value will have been actually
	set to NULL.
	*/
	if (!value) {
	value = Py_None;
	Py_INCREF(value);
	}

	if (PyExceptionInstance_Check(value))
	inclass = PyExceptionInstance_Class(value);

	/* Normalize the exception so that if the type is a class, the
	value will be an instance.
	*/
	if (PyExceptionClass_Check(type)) {
	/* 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 (!inclass \|\| !PyObject_IsSubclass(inclass, type)) {
	PyObject args, res;

	if (value == Py_None)
	args = PyTuple_New(0);
	else if (PyTuple_Check(value)) {
	Py_INCREF(value);
	args = value;
	}
	else
	args = PyTuple_Pack(1, value);

	if (args == NULL)
	goto finally;
	res = PyEval_CallObject(type, args);
	Py_DECREF(args);
	if (res == NULL)
	goto finally;
	Py_DECREF(value);
	value = res;
	}
	/* if the class of the instance doesn't exactly match the
	class of the type, believe the instance
	*/
	else if (inclass != type) {
	Py_DECREF(type);
	type = inclass;
	Py_INCREF(type);
	}
	}
	*exc = type;
	*val = value;
	return;
	finally:
	Py_DECREF(type);
	Py_DECREF(value);
	/* 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);
	if (initial_tb != NULL) {
	if (*tb == NULL)
	*tb = initial_tb;
	else
	Py_DECREF(initial_tb);
	}
	/* normalize recursively */
	tstate = PyThreadState_GET();
	if (++tstate->recursion_depth > Py_GetRecursionLimit()) {
	--tstate->recursion_depth;
	PyErr_SetObject(PyExc_RuntimeError, PyExc_RecursionErrorInst);
	return;
	}
	PyErr_NormalizeException(exc, val, tb);
	--tstate->recursion_depth;
	}


	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);
	}

	/* 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 (PyErr_ExceptionMatches(PyExc_MemoryError))
	/* already current */
	return NULL;

	/* raise the pre-allocated instance if it still exists */
	if (PyExc_MemoryErrorInst)
	PyErr_SetObject(PyExc_MemoryError, PyExc_MemoryErrorInst);
	else
	/* this will probably fail since there's no memory and hee,
	hee, we have to instantiate this class
	*/
	PyErr_SetNone(PyExc_MemoryError);

	return NULL;
	}

	PyObject *
	PyErr_SetFromErrnoWithFilenameObject(PyObject exc, PyObject filenameObject)
	{
	PyObject *v;
	char *s;
	int i = errno;
	#ifdef PLAN9
	char errbuf[ERRMAX];
	#endif
	#ifdef MS_WINDOWS
	char *s_buf = NULL;
	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */
	#endif
	#ifdef EINTR
	if (i == EINTR && PyErr_CheckSignals())
	return NULL;
	#endif
	#ifdef PLAN9
	rerrstr(errbuf, sizeof errbuf);
	s = errbuf;
	#else
	if (i == 0)
	s = "Error"; /* Sometimes errno didn't get set */
	else
	#ifndef MS_WINDOWS
	s = strerror(i);
	#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) {
	s = _sys_errlist[i];
	}
	else {
	int len = FormatMessage(
	FORMAT_MESSAGE_ALLOCATE_BUFFER \|
	FORMAT_MESSAGE_FROM_SYSTEM \|
	FORMAT_MESSAGE_IGNORE_INSERTS,
	NULL, /* no message source */
	i,
	MAKELANGID(LANG_NEUTRAL,
	SUBLANG_DEFAULT),
	/* Default language */
	(LPTSTR) &s_buf,
	0, /* size not used */
	NULL); /* no args */
	if (len==0) {
	/* Only ever seen this in out-of-mem
	situations */
	sprintf(s_small_buf, "Windows Error 0x%X", i);
	s = s_small_buf;
	s_buf = NULL;
	} else {
	s = s_buf;
	/* remove trailing cr/lf and dots */
	while (len > 0 && (s[len-1] <= ' ' \|\| s[len-1] == '.'))
	s[--len] = '\0';
	}
	}
	}
	#endif /* Unix/Windows */
	#endif /* PLAN 9*/
	if (filenameObject != NULL)
	v = Py_BuildValue("(isO)", i, s, filenameObject);
	else
	v = Py_BuildValue("(is)", i, s);
	if (v != NULL) {
	PyErr_SetObject(exc, v);
	Py_DECREF(v);
	}
	#ifdef MS_WINDOWS
	LocalFree(s_buf);
	#endif
	return NULL;
	}


	PyObject *
	PyErr_SetFromErrnoWithFilename(PyObject exc, char filename)
	{
	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
	Py_XDECREF(name);
	return result;
	}

	#ifdef Py_WIN_WIDE_FILENAMES
	PyObject *
	PyErr_SetFromErrnoWithUnicodeFilename(PyObject exc, Py_UNICODE filename)
	{
	PyObject *name = filename ?
	PyUnicode_FromUnicode(filename, wcslen(filename)) :
	NULL;
	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
	Py_XDECREF(name);
	return result;
	}
	#endif /* Py_WIN_WIDE_FILENAMES */

	PyObject *
	PyErr_SetFromErrno(PyObject *exc)
	{
	return PyErr_SetFromErrnoWithFilenameObject(exc, NULL);
	}

	#ifdef MS_WINDOWS
	/* Windows specific error code handling */
	PyObject *PyErr_SetExcFromWindowsErrWithFilenameObject(
	PyObject *exc,
	int ierr,
	PyObject *filenameObject)
	{
	int len;
	char *s;
	char s_buf = NULL; / Free via LocalFree */
	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */
	PyObject *v;
	DWORD err = (DWORD)ierr;
	if (err==0) err = GetLastError();
	len = FormatMessage(
	/* 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 */
	(LPTSTR) &s_buf,
	0, /* size not used */
	NULL); /* no args */
	if (len==0) {
	/* Only seen this in out of mem situations */
	sprintf(s_small_buf, "Windows Error 0x%X", err);
	s = s_small_buf;
	s_buf = NULL;
	} else {
	s = s_buf;
	/* remove trailing cr/lf and dots */
	while (len > 0 && (s[len-1] <= ' ' \|\| s[len-1] == '.'))
	s[--len] = '\0';
	}
	if (filenameObject != NULL)
	v = Py_BuildValue("(isO)", err, s, filenameObject);
	else
	v = Py_BuildValue("(is)", err, s);
	if (v != NULL) {
	PyErr_SetObject(exc, v);
	Py_DECREF(v);
	}
	LocalFree(s_buf);
	return NULL;
	}

	PyObject *PyErr_SetExcFromWindowsErrWithFilename(
	PyObject *exc,
	int ierr,
	const char *filename)
	{
	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,
	ierr,
	name);
	Py_XDECREF(name);
	return ret;
	}

	#ifdef Py_WIN_WIDE_FILENAMES
	PyObject *PyErr_SetExcFromWindowsErrWithUnicodeFilename(
	PyObject *exc,
	int ierr,
	const Py_UNICODE *filename)
	{
	PyObject *name = filename ?
	PyUnicode_FromUnicode(filename, wcslen(filename)) :
	NULL;
	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,
	ierr,
	name);
	Py_XDECREF(name);
	return ret;
	}
	#endif /* Py_WIN_WIDE_FILENAMES */

	PyObject PyErr_SetExcFromWindowsErr(PyObject exc, int ierr)
	{
	return PyErr_SetExcFromWindowsErrWithFilename(exc, ierr, NULL);
	}

	PyObject *PyErr_SetFromWindowsErr(int ierr)
	{
	return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,
	ierr, NULL);
	}
	PyObject *PyErr_SetFromWindowsErrWithFilename(
	int ierr,
	const char *filename)
	{
	PyObject *name = filename ? PyBytes_FromString(filename) : NULL;
	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
	PyExc_WindowsError,
	ierr, name);
	Py_XDECREF(name);
	return result;
	}

	#ifdef Py_WIN_WIDE_FILENAMES
	PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(
	int ierr,
	const Py_UNICODE *filename)
	{
	PyObject *name = filename ?
	PyUnicode_FromUnicode(filename, wcslen(filename)) :
	NULL;
	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
	PyExc_WindowsError,
	ierr, name);
	Py_XDECREF(name);
	return result;
	}
	#endif /* Py_WIN_WIDE_FILENAMES */
	#endif /* MS_WINDOWS */

	void
	_PyErr_BadInternalCall(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)
	{
	PyErr_Format(PyExc_SystemError,
	"bad argument to internal function");
	}
	#define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)



	PyObject *
	PyErr_Format(PyObject exception, const char format, ...)
	{
	va_list vargs;
	PyObject* string;

	#ifdef HAVE_STDARG_PROTOTYPES
	va_start(vargs, format);
	#else
	va_start(vargs);
	#endif

	string = PyBytes_FromFormatV(format, vargs);
	PyErr_SetObject(exception, string);
	Py_XDECREF(string);
	va_end(vargs);
	return NULL;
	}



	PyObject *
	PyErr_NewException(char name, PyObject base, PyObject *dict)
	{
	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 = PyBytes_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 new-style 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;
	}

	/* 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)
	{
	PyObject f, t, v, tb;
	PyErr_Fetch(&t, &v, &tb);
	f = PySys_GetObject("stderr");
	if (f != NULL) {
	PyFile_WriteString("Exception ", f);
	if (t) {
	PyObject* moduleName;
	char* className;
	assert(PyExceptionClass_Check(t));
	className = PyExceptionClass_Name(t);
	if (className != NULL) {
	char *dot = strrchr(className, '.');
	if (dot != NULL)
	className = dot+1;
	}

	moduleName = PyObject_GetAttrString(t, "__module__");
	if (moduleName == NULL)
	PyFile_WriteString("<unknown>", f);
	else {
	char* modstr = PyBytes_AsString(moduleName);
	if (modstr &&
	strcmp(modstr, "exceptions") != 0)
	{
	PyFile_WriteString(modstr, f);
	PyFile_WriteString(".", f);
	}
	}
	if (className == NULL)
	PyFile_WriteString("<unknown>", f);
	else
	PyFile_WriteString(className, f);
	if (v && v != Py_None) {
	PyFile_WriteString(": ", f);
	PyFile_WriteObject(v, f, 0);
	}
	Py_XDECREF(moduleName);
	}
	PyFile_WriteString(" in ", f);
	PyFile_WriteObject(obj, f, 0);
	PyFile_WriteString(" ignored\n", f);
	PyErr_Clear(); /* Just in case */
	}
	Py_XDECREF(t);
	Py_XDECREF(v);
	Py_XDECREF(tb);
	}

	extern PyObject *PyModule_GetWarningsModule(void);


	/* Set file and line information for the current exception.
	If the exception is not a SyntaxError, also sets additional attributes
	to make printing of exceptions believe it is a syntax error. */

	void
	PyErr_SyntaxLocation(const char *filename, int lineno)
	{
	PyObject exc, v, tb, tmp;

	/* add attributes for the line number and filename for the error */
	PyErr_Fetch(&exc, &v, &tb);
	PyErr_NormalizeException(&exc, &v, &tb);
	/* XXX check that it is, indeed, a syntax error. It might not
	* be, though. */
	tmp = PyInt_FromLong(lineno);
	if (tmp == NULL)
	PyErr_Clear();
	else {
	if (PyObject_SetAttrString(v, "lineno", tmp))
	PyErr_Clear();
	Py_DECREF(tmp);
	}
	if (filename != NULL) {
	tmp = PyBytes_FromString(filename);
	if (tmp == NULL)
	PyErr_Clear();
	else {
	if (PyObject_SetAttrString(v, "filename", tmp))
	PyErr_Clear();
	Py_DECREF(tmp);
	}

	tmp = PyErr_ProgramText(filename, lineno);
	if (tmp) {
	if (PyObject_SetAttrString(v, "text", tmp))
	PyErr_Clear();
	Py_DECREF(tmp);
	}
	}
	if (PyObject_SetAttrString(v, "offset", Py_None)) {
	PyErr_Clear();
	}
	if (exc != PyExc_SyntaxError) {
	if (!PyObject_HasAttrString(v, "msg")) {
	tmp = PyObject_Str(v);
	if (tmp) {
	if (PyObject_SetAttrString(v, "msg", tmp))
	PyErr_Clear();
	Py_DECREF(tmp);
	} else {
	PyErr_Clear();
	}
	}
	if (!PyObject_HasAttrString(v, "print_file_and_line")) {
	if (PyObject_SetAttrString(v, "print_file_and_line",
	Py_None))
	PyErr_Clear();
	}
	}
	PyErr_Restore(exc, v, tb);
	}

	/* com_fetch_program_text will attempt to load the line of text that
	the exception refers to. If it fails, it will return NULL but will
	not set an exception.

	XXX The functionality of this function is quite similar to the
	functionality in tb_displayline() in traceback.c.
	*/

	PyObject *
	PyErr_ProgramText(const char *filename, int lineno)
	{
	FILE *fp;
	int i;
	char linebuf[1000];

	if (filename == NULL \|\| *filename == '\0' \|\| lineno <= 0)
	return NULL;
	fp = fopen(filename, "r" PY_STDIOTEXTMODE);
	if (fp == NULL)
	return NULL;
	for (i = 0; i < lineno; i++) {
	char *pLastChar = &linebuf[sizeof(linebuf) - 2];
	do {
	*pLastChar = '\0';
	if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, fp, NULL) == NULL)
	break;
	/* fgets read something; if it didn't get as
	far as pLastChar, it must have found a newline
	or hit the end of the file; if pLastChar is \n,
	it obviously found a newline; else we haven't
	yet seen a newline, so must continue */
	} while (pLastChar != '\0' && pLastChar != '\n');
	}
	fclose(fp);
	if (i == lineno) {
	char *p = linebuf;
	while (p == ' ' \|\| p == '\t' \|\| *p == '\014')
	p++;
	return PyBytes_FromString(p);
	}
	return NULL;
	}

	#ifdef __cplusplus
	}
	#endif