ref: 3e0e77a8521331412c96b6371622aa2f76d7aefc
dir: /sys/src/cmd/python/Python/errors.c/
/* 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 = PyString_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; 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 */ PyErr_NormalizeException(exc, val, tb); } 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 ? PyString_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 ? PyString_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 ? PyString_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 = PyString_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 = PyString_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 = NULL; if (PyExceptionClass_Check(t)) className = PyExceptionClass_Name(t); else if (PyString_Check(t)) className = PyString_AS_STRING(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 = PyString_AsString(moduleName); if (modstr) { 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); /* Function to issue a warning message; may raise an exception. */ int PyErr_WarnEx(PyObject *category, const char *message, Py_ssize_t stack_level) { PyObject *dict, *func = NULL; PyObject *warnings_module = PyModule_GetWarningsModule(); if (warnings_module != NULL) { dict = PyModule_GetDict(warnings_module); if (dict != NULL) func = PyDict_GetItemString(dict, "warn"); } if (func == NULL) { PySys_WriteStderr("warning: %s\n", message); return 0; } else { PyObject *res; if (category == NULL) category = PyExc_RuntimeWarning; res = PyObject_CallFunction(func, "sOn", message, category, stack_level); if (res == NULL) return -1; Py_DECREF(res); return 0; } } /* PyErr_Warn is only for backwards compatability and will be removed. Use PyErr_WarnEx instead. */ #undef PyErr_Warn PyAPI_FUNC(int) PyErr_Warn(PyObject *category, char *message) { return PyErr_WarnEx(category, message, 1); } /* Warning with explicit origin */ int PyErr_WarnExplicit(PyObject *category, const char *message, const char *filename, int lineno, const char *module, PyObject *registry) { PyObject *mod, *dict, *func = NULL; mod = PyImport_ImportModule("warnings"); if (mod != NULL) { dict = PyModule_GetDict(mod); func = PyDict_GetItemString(dict, "warn_explicit"); Py_DECREF(mod); } if (func == NULL) { PySys_WriteStderr("warning: %s\n", message); return 0; } else { PyObject *res; if (category == NULL) category = PyExc_RuntimeWarning; if (registry == NULL) registry = Py_None; res = PyObject_CallFunction(func, "sOsizO", message, category, filename, lineno, module, registry); if (res == NULL) return -1; Py_DECREF(res); return 0; } } /* 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 = PyString_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 PyString_FromString(p); } return NULL; } #ifdef __cplusplus } #endif