static void flush_io(void) { PyObject *f, *r; PyObject *type, *value, *traceback; /* Save the current exception */ PyErr_Fetch(&type, &value, &traceback); f = _PySys_GetObjectId(&PyId_stderr); if (f != NULL) { r = _PyObject_CallMethodId(f, &PyId_flush, NULL); if (r) Py_DECREF(r); else PyErr_Clear(); } f = _PySys_GetObjectId(&PyId_stdout); if (f != NULL) { r = _PyObject_CallMethodId(f, &PyId_flush, NULL); if (r) Py_DECREF(r); else PyErr_Clear(); } PyErr_Restore(type, value, traceback); }
static int flush_std_files(void) { PyObject *fout = _PySys_GetObjectId(&PyId_stdout); PyObject *ferr = _PySys_GetObjectId(&PyId_stderr); PyObject *tmp; int status = 0; if (fout != NULL && fout != Py_None && !file_is_closed(fout)) { tmp = _PyObject_CallMethodId(fout, &PyId_flush, ""); if (tmp == NULL) { PyErr_WriteUnraisable(fout); status = -1; } else Py_DECREF(tmp); } if (ferr != NULL && ferr != Py_None && !file_is_closed(ferr)) { tmp = _PyObject_CallMethodId(ferr, &PyId_flush, ""); if (tmp == NULL) { PyErr_Clear(); status = -1; } else Py_DECREF(tmp); } return status; }
static int faulthandler_get_fileno(PyObject **file_ptr) { PyObject *result; long fd_long; int fd; PyObject *file = *file_ptr; if (file == NULL || file == Py_None) { file = _PySys_GetObjectId(&PyId_stderr); if (file == NULL) { PyErr_SetString(PyExc_RuntimeError, "unable to get sys.stderr"); return -1; } if (file == Py_None) { PyErr_SetString(PyExc_RuntimeError, "sys.stderr is None"); return -1; } } else if (PyLong_Check(file)) { fd = _PyLong_AsInt(file); if (fd == -1 && PyErr_Occurred()) return -1; if (fd < 0) { PyErr_SetString(PyExc_ValueError, "file is not a valid file descripter"); return -1; } *file_ptr = NULL; return fd; } result = _PyObject_CallMethodId(file, &PyId_fileno, NULL); if (result == NULL) return -1; fd = -1; if (PyLong_Check(result)) { fd_long = PyLong_AsLong(result); if (0 <= fd_long && fd_long < INT_MAX) fd = (int)fd_long; } Py_DECREF(result); if (fd == -1) { PyErr_SetString(PyExc_RuntimeError, "file.fileno() is not a valid file descriptor"); return -1; } result = _PyObject_CallMethodId(file, &PyId_flush, NULL); if (result != NULL) Py_DECREF(result); else { /* ignore flush() error */ PyErr_Clear(); } *file_ptr = file; return fd; }
void PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb) { PyObject *seen; PyObject *f = _PySys_GetObjectId(&PyId_stderr); if (PyExceptionInstance_Check(value) && tb != NULL && PyTraceBack_Check(tb)) { /* Put the traceback on the exception, otherwise it won't get displayed. See issue #18776. */ PyObject *cur_tb = PyException_GetTraceback(value); if (cur_tb == NULL) PyException_SetTraceback(value, tb); else Py_DECREF(cur_tb); } if (f == Py_None) { /* pass */ } else if (f == NULL) { _PyObject_Dump(value); fprintf(stderr, "lost sys.stderr\n"); } else { /* We choose to ignore seen being possibly NULL, and report at least the main exception (it could be a MemoryError). */ seen = PySet_New(NULL); if (seen == NULL) PyErr_Clear(); print_exception_recursive(f, value, seen); Py_XDECREF(seen); } }
static void handle_system_exit(void) { PyObject *exception, *value, *tb; int exitcode = 0; if (Py_InspectFlag) /* Don't exit if -i flag was given. This flag is set to 0 * when entering interactive mode for inspecting. */ return; PyErr_Fetch(&exception, &value, &tb); fflush(stdout); if (value == NULL || value == Py_None) goto done; if (PyExceptionInstance_Check(value)) { /* The error code should be in the `code' attribute. */ _Py_IDENTIFIER(code); PyObject *code = _PyObject_GetAttrId(value, &PyId_code); if (code) { Py_DECREF(value); value = code; if (value == Py_None) goto done; } /* If we failed to dig out the 'code' attribute, just let the else clause below print the error. */ } if (PyLong_Check(value)) exitcode = (int)PyLong_AsLong(value); else { PyObject *sys_stderr = _PySys_GetObjectId(&PyId_stderr); /* We clear the exception here to avoid triggering the assertion * in PyObject_Str that ensures it won't silently lose exception * details. */ PyErr_Clear(); if (sys_stderr != NULL && sys_stderr != Py_None) { PyFile_WriteObject(value, sys_stderr, Py_PRINT_RAW); } else { PyObject_Print(value, stderr, Py_PRINT_RAW); fflush(stderr); } PySys_WriteStderr("\n"); exitcode = 1; } done: /* Restore and clear the exception info, in order to properly decref * the exception, value, and traceback. If we just exit instead, * these leak, which confuses PYTHONDUMPREFS output, and may prevent * some finalizers from running. */ PyErr_Restore(exception, value, tb); PyErr_Clear(); Py_Exit(exitcode); /* NOTREACHED */ }
int PyRun_InteractiveLoopFlags(FILE *fp, const char *filename_str, PyCompilerFlags *flags) { PyObject *filename, *v; int ret, err; PyCompilerFlags local_flags; filename = PyUnicode_DecodeFSDefault(filename_str); if (filename == NULL) { PyErr_Print(); return -1; } if (flags == NULL) { flags = &local_flags; local_flags.cf_flags = 0; } v = _PySys_GetObjectId(&PyId_ps1); if (v == NULL) { _PySys_SetObjectId(&PyId_ps1, v = PyUnicode_FromString(">>> ")); Py_XDECREF(v); } v = _PySys_GetObjectId(&PyId_ps2); if (v == NULL) { _PySys_SetObjectId(&PyId_ps2, v = PyUnicode_FromString("... ")); Py_XDECREF(v); } err = -1; for (;;) { ret = PyRun_InteractiveOneObject(fp, filename, flags); _PY_DEBUG_PRINT_TOTAL_REFS(); if (ret == E_EOF) { err = 0; break; } /* if (ret == E_NOMEM) break; */ } Py_DECREF(filename); return err; }
static int _Py_FatalError_PrintExc(int fd) { PyObject *ferr, *res; PyObject *exception, *v, *tb; int has_tb; if (PyThreadState_GET() == NULL) { /* The GIL is released: trying to acquire it is likely to deadlock, just give up. */ return 0; } PyErr_Fetch(&exception, &v, &tb); if (exception == NULL) { /* No current exception */ return 0; } ferr = _PySys_GetObjectId(&PyId_stderr); if (ferr == NULL || ferr == Py_None) { /* sys.stderr is not set yet or set to None, no need to try to display the exception */ return 0; } PyErr_NormalizeException(&exception, &v, &tb); if (tb == NULL) { tb = Py_None; Py_INCREF(tb); } PyException_SetTraceback(v, tb); if (exception == NULL) { /* PyErr_NormalizeException() failed */ return 0; } has_tb = (tb != Py_None); PyErr_Display(exception, v, tb); Py_XDECREF(exception); Py_XDECREF(v); Py_XDECREF(tb); /* sys.stderr may be buffered: call sys.stderr.flush() */ res = _PyObject_CallMethodId(ferr, &PyId_flush, ""); if (res == NULL) PyErr_Clear(); else Py_DECREF(res); return has_tb; }
static PyObject* faulthandler_get_fileno(PyObject *file, int *p_fd) { PyObject *result; long fd_long; int fd; if (file == NULL || file == Py_None) { file = _PySys_GetObjectId(&PyId_stderr); if (file == NULL) { PyErr_SetString(PyExc_RuntimeError, "unable to get sys.stderr"); return NULL; } if (file == Py_None) { PyErr_SetString(PyExc_RuntimeError, "sys.stderr is None"); return NULL; } } result = _PyObject_CallMethodId(file, &PyId_fileno, ""); if (result == NULL) return NULL; fd = -1; if (PyLong_Check(result)) { fd_long = PyLong_AsLong(result); if (0 <= fd_long && fd_long < INT_MAX) fd = (int)fd_long; } Py_DECREF(result); if (fd == -1) { PyErr_SetString(PyExc_RuntimeError, "file.fileno() is not a valid file descriptor"); return NULL; } result = _PyObject_CallMethodId(file, &PyId_flush, ""); if (result != NULL) Py_DECREF(result); else { /* ignore flush() error */ PyErr_Clear(); } *p_fd = fd; return file; }
/* Returns 0 on error (no new refs), 1 on success */ static int setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno, PyObject **module, PyObject **registry) { PyObject *globals; /* Setup globals and lineno. */ PyFrameObject *f = PyThreadState_GET()->frame; // Stack level comparisons to Python code is off by one as there is no // warnings-related stack level to avoid. if (stack_level <= 0 || is_internal_frame(f)) { while (--stack_level > 0 && f != NULL) { f = f->f_back; } } else { while (--stack_level > 0 && f != NULL) { f = next_external_frame(f); } } if (f == NULL) { globals = PyThreadState_Get()->interp->sysdict; *lineno = 1; } else { globals = f->f_globals; *lineno = PyFrame_GetLineNumber(f); } *module = NULL; /* Setup registry. */ assert(globals != NULL); assert(PyDict_Check(globals)); *registry = PyDict_GetItemString(globals, "__warningregistry__"); if (*registry == NULL) { int rc; *registry = PyDict_New(); if (*registry == NULL) return 0; rc = PyDict_SetItemString(globals, "__warningregistry__", *registry); if (rc < 0) goto handle_error; } else Py_INCREF(*registry); /* Setup module. */ *module = PyDict_GetItemString(globals, "__name__"); if (*module == NULL) { *module = PyUnicode_FromString("<string>"); if (*module == NULL) goto handle_error; } else Py_INCREF(*module); /* Setup filename. */ *filename = PyDict_GetItemString(globals, "__file__"); if (*filename != NULL && PyUnicode_Check(*filename)) { Py_ssize_t len; int kind; void *data; if (PyUnicode_READY(*filename)) goto handle_error; len = PyUnicode_GetLength(*filename); kind = PyUnicode_KIND(*filename); data = PyUnicode_DATA(*filename); #define ascii_lower(c) ((c <= 127) ? Py_TOLOWER(c) : 0) /* if filename.lower().endswith(".pyc"): */ if (len >= 4 && PyUnicode_READ(kind, data, len-4) == '.' && ascii_lower(PyUnicode_READ(kind, data, len-3)) == 'p' && ascii_lower(PyUnicode_READ(kind, data, len-2)) == 'y' && ascii_lower(PyUnicode_READ(kind, data, len-1)) == 'c') { *filename = PyUnicode_Substring(*filename, 0, PyUnicode_GET_LENGTH(*filename)-1); if (*filename == NULL) goto handle_error; } else Py_INCREF(*filename); } else { *filename = NULL; if (*module != Py_None && PyUnicode_CompareWithASCIIString(*module, "__main__") == 0) { PyObject *argv = _PySys_GetObjectId(&PyId_argv); /* PyList_Check() is needed because sys.argv is set to None during Python finalization */ if (argv != NULL && PyList_Check(argv) && PyList_Size(argv) > 0) { int is_true; *filename = PyList_GetItem(argv, 0); Py_INCREF(*filename); /* If sys.argv[0] is false, then use '__main__'. */ is_true = PyObject_IsTrue(*filename); if (is_true < 0) { Py_DECREF(*filename); goto handle_error; } else if (!is_true) { Py_XSETREF(*filename, PyUnicode_FromString("__main__")); if (*filename == NULL) goto handle_error; } } else { /* embedded interpreters don't have sys.argv, see bug #839151 */ *filename = PyUnicode_FromString("__main__"); if (*filename == NULL) goto handle_error; } } if (*filename == NULL) { *filename = *module; Py_INCREF(*filename); } } return 1; handle_error: /* filename not XDECREF'ed here as there is no way to jump here with a dangling reference. */ Py_XDECREF(*registry); Py_XDECREF(*module); return 0; }
static void show_warning(PyObject *filename, int lineno, PyObject *text, PyObject *category, PyObject *sourceline) { PyObject *f_stderr; PyObject *name; char lineno_str[128]; _Py_IDENTIFIER(__name__); PyOS_snprintf(lineno_str, sizeof(lineno_str), ":%d: ", lineno); name = _PyObject_GetAttrId(category, &PyId___name__); if (name == NULL) /* XXX Can an object lack a '__name__' attribute? */ goto error; f_stderr = _PySys_GetObjectId(&PyId_stderr); if (f_stderr == NULL) { fprintf(stderr, "lost sys.stderr\n"); goto error; } /* Print "filename:lineno: category: text\n" */ if (PyFile_WriteObject(filename, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString(lineno_str, f_stderr) < 0) goto error; if (PyFile_WriteObject(name, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString(": ", f_stderr) < 0) goto error; if (PyFile_WriteObject(text, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString("\n", f_stderr) < 0) goto error; Py_CLEAR(name); /* Print " source_line\n" */ if (sourceline) { int kind; void *data; Py_ssize_t i, len; Py_UCS4 ch; PyObject *truncated; if (PyUnicode_READY(sourceline) < 1) goto error; kind = PyUnicode_KIND(sourceline); data = PyUnicode_DATA(sourceline); len = PyUnicode_GET_LENGTH(sourceline); for (i=0; i<len; i++) { ch = PyUnicode_READ(kind, data, i); if (ch != ' ' && ch != '\t' && ch != '\014') break; } truncated = PyUnicode_Substring(sourceline, i, len); if (truncated == NULL) goto error; PyFile_WriteObject(sourceline, f_stderr, Py_PRINT_RAW); Py_DECREF(truncated); PyFile_WriteString("\n", f_stderr); } else { _Py_DisplaySourceLine(f_stderr, filename, lineno, 2); } error: Py_XDECREF(name); PyErr_Clear(); }
/* 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; 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) { char *dot = strrchr(className, '.'); if (dot != NULL) className = dot+1; } moduleName = _PyObject_GetAttrId(t, &PyId___module__); if (moduleName == NULL) { 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) goto done; } else { if (PyFile_WriteString(className, f) < 0) goto done; } if (v && v != Py_None) { if (PyFile_WriteString(": ", f) < 0) goto done; if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0) { PyErr_Clear(); if (PyFile_WriteString("<exception str() failed>", f) < 0) { goto done; } } } if (PyFile_WriteString("\n", f) < 0) goto done; done: Py_XDECREF(moduleName); Py_XDECREF(t); Py_XDECREF(v); Py_XDECREF(tb); PyErr_Clear(); /* Just in case */ }
static PyObject * _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io) { Py_ssize_t i; PyObject *binary; PyObject *v; Py_ssize_t npath; size_t taillen; PyObject *syspath; PyObject *path; const char* tail; PyObject *filebytes; const char* filepath; Py_ssize_t len; PyObject* result; filebytes = PyUnicode_EncodeFSDefault(filename); if (filebytes == NULL) { PyErr_Clear(); return NULL; } filepath = PyBytes_AS_STRING(filebytes); /* Search tail of filename in sys.path before giving up */ tail = strrchr(filepath, SEP); if (tail == NULL) tail = filepath; else tail++; taillen = strlen(tail); syspath = _PySys_GetObjectId(&PyId_path); if (syspath == NULL || !PyList_Check(syspath)) goto error; npath = PyList_Size(syspath); for (i = 0; i < npath; i++) { v = PyList_GetItem(syspath, i); if (v == NULL) { PyErr_Clear(); break; } if (!PyUnicode_Check(v)) continue; path = PyUnicode_EncodeFSDefault(v); if (path == NULL) { PyErr_Clear(); continue; } len = PyBytes_GET_SIZE(path); if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1) { Py_DECREF(path); continue; /* Too long */ } strcpy(namebuf, PyBytes_AS_STRING(path)); Py_DECREF(path); if (strlen(namebuf) != (size_t)len) continue; /* v contains '\0' */ if (len > 0 && namebuf[len-1] != SEP) namebuf[len++] = SEP; strcpy(namebuf+len, tail); binary = _PyObject_CallMethodId(io, &PyId_open, "ss", namebuf, "rb"); if (binary != NULL) { result = binary; goto finally; } PyErr_Clear(); } goto error; error: result = NULL; finally: Py_DECREF(filebytes); return result; }
int PyRun_InteractiveLoopFlags(FILE *fp, const char *filename_str, PyCompilerFlags *flags) { PyObject *filename, *v; int ret, err; PyCompilerFlags local_flags; int nomem_count = 0; #ifdef Py_REF_DEBUG int show_ref_count = _PyInterpreterState_Get()->core_config.show_ref_count; #endif filename = PyUnicode_DecodeFSDefault(filename_str); if (filename == NULL) { PyErr_Print(); return -1; } if (flags == NULL) { flags = &local_flags; local_flags.cf_flags = 0; } v = _PySys_GetObjectId(&PyId_ps1); if (v == NULL) { _PySys_SetObjectId(&PyId_ps1, v = PyUnicode_FromString(">>> ")); Py_XDECREF(v); } v = _PySys_GetObjectId(&PyId_ps2); if (v == NULL) { _PySys_SetObjectId(&PyId_ps2, v = PyUnicode_FromString("... ")); Py_XDECREF(v); } err = 0; do { ret = PyRun_InteractiveOneObjectEx(fp, filename, flags); if (ret == -1 && PyErr_Occurred()) { /* Prevent an endless loop after multiple consecutive MemoryErrors * while still allowing an interactive command to fail with a * MemoryError. */ if (PyErr_ExceptionMatches(PyExc_MemoryError)) { if (++nomem_count > 16) { PyErr_Clear(); err = -1; break; } } else { nomem_count = 0; } PyErr_Print(); flush_io(); } else { nomem_count = 0; } #ifdef Py_REF_DEBUG if (show_ref_count) { _PyDebug_PrintTotalRefs(); } #endif } while (ret != E_EOF); Py_DECREF(filename); return err; }
void PyErr_PrintEx(int set_sys_last_vars) { PyObject *exception, *v, *tb, *hook; if (PyErr_ExceptionMatches(PyExc_SystemExit)) { handle_system_exit(); } PyErr_Fetch(&exception, &v, &tb); if (exception == NULL) return; PyErr_NormalizeException(&exception, &v, &tb); if (tb == NULL) { tb = Py_None; Py_INCREF(tb); } PyException_SetTraceback(v, tb); if (exception == NULL) return; /* Now we know v != NULL too */ if (set_sys_last_vars) { if (_PySys_SetObjectId(&PyId_last_type, exception) < 0) { PyErr_Clear(); } if (_PySys_SetObjectId(&PyId_last_value, v) < 0) { PyErr_Clear(); } if (_PySys_SetObjectId(&PyId_last_traceback, tb) < 0) { PyErr_Clear(); } } hook = _PySys_GetObjectId(&PyId_excepthook); if (hook) { PyObject* stack[3]; PyObject *result; stack[0] = exception; stack[1] = v; stack[2] = tb; result = _PyObject_FastCall(hook, stack, 3); if (result == NULL) { PyObject *exception2, *v2, *tb2; if (PyErr_ExceptionMatches(PyExc_SystemExit)) { handle_system_exit(); } PyErr_Fetch(&exception2, &v2, &tb2); PyErr_NormalizeException(&exception2, &v2, &tb2); /* It should not be possible for exception2 or v2 to be NULL. However PyErr_Display() can't tolerate NULLs, so just be safe. */ if (exception2 == NULL) { exception2 = Py_None; Py_INCREF(exception2); } if (v2 == NULL) { v2 = Py_None; Py_INCREF(v2); } fflush(stdout); PySys_WriteStderr("Error in sys.excepthook:\n"); PyErr_Display(exception2, v2, tb2); PySys_WriteStderr("\nOriginal exception was:\n"); PyErr_Display(exception, v, tb); Py_DECREF(exception2); Py_DECREF(v2); Py_XDECREF(tb2); } Py_XDECREF(result); } else { PySys_WriteStderr("sys.excepthook is missing\n"); PyErr_Display(exception, v, tb); } Py_XDECREF(exception); Py_XDECREF(v); Py_XDECREF(tb); }
/* A PyRun_InteractiveOneObject() auxiliary function that does not print the * error on failure. */ static int PyRun_InteractiveOneObjectEx(FILE *fp, PyObject *filename, PyCompilerFlags *flags) { PyObject *m, *d, *v, *w, *oenc = NULL, *mod_name; mod_ty mod; PyArena *arena; const char *ps1 = "", *ps2 = "", *enc = NULL; int errcode = 0; _Py_IDENTIFIER(encoding); _Py_IDENTIFIER(__main__); mod_name = _PyUnicode_FromId(&PyId___main__); /* borrowed */ if (mod_name == NULL) { return -1; } if (fp == stdin) { /* Fetch encoding from sys.stdin if possible. */ v = _PySys_GetObjectId(&PyId_stdin); if (v && v != Py_None) { oenc = _PyObject_GetAttrId(v, &PyId_encoding); if (oenc) enc = PyUnicode_AsUTF8(oenc); if (!enc) PyErr_Clear(); } } v = _PySys_GetObjectId(&PyId_ps1); if (v != NULL) { v = PyObject_Str(v); if (v == NULL) PyErr_Clear(); else if (PyUnicode_Check(v)) { ps1 = PyUnicode_AsUTF8(v); if (ps1 == NULL) { PyErr_Clear(); ps1 = ""; } } } w = _PySys_GetObjectId(&PyId_ps2); if (w != NULL) { w = PyObject_Str(w); if (w == NULL) PyErr_Clear(); else if (PyUnicode_Check(w)) { ps2 = PyUnicode_AsUTF8(w); if (ps2 == NULL) { PyErr_Clear(); ps2 = ""; } } } arena = PyArena_New(); if (arena == NULL) { Py_XDECREF(v); Py_XDECREF(w); Py_XDECREF(oenc); return -1; } mod = PyParser_ASTFromFileObject(fp, filename, enc, Py_single_input, ps1, ps2, flags, &errcode, arena); Py_XDECREF(v); Py_XDECREF(w); Py_XDECREF(oenc); if (mod == NULL) { PyArena_Free(arena); if (errcode == E_EOF) { PyErr_Clear(); return E_EOF; } return -1; } m = PyImport_AddModuleObject(mod_name); if (m == NULL) { PyArena_Free(arena); return -1; } d = PyModule_GetDict(m); v = run_mod(mod, filename, d, d, flags, arena); PyArena_Free(arena); if (v == NULL) { return -1; } Py_DECREF(v); flush_io(); return 0; }
static void _Py_PrintFatalError(int fd) { PyObject *ferr, *res; PyObject *exception, *v, *tb; int has_tb; PyThreadState *tstate; PyErr_Fetch(&exception, &v, &tb); if (exception == NULL) { /* No current exception */ goto display_stack; } ferr = _PySys_GetObjectId(&PyId_stderr); if (ferr == NULL || ferr == Py_None) { /* sys.stderr is not set yet or set to None, no need to try to display the exception */ goto display_stack; } PyErr_NormalizeException(&exception, &v, &tb); if (tb == NULL) { tb = Py_None; Py_INCREF(tb); } PyException_SetTraceback(v, tb); if (exception == NULL) { /* PyErr_NormalizeException() failed */ goto display_stack; } has_tb = (tb != Py_None); PyErr_Display(exception, v, tb); Py_XDECREF(exception); Py_XDECREF(v); Py_XDECREF(tb); /* sys.stderr may be buffered: call sys.stderr.flush() */ res = _PyObject_CallMethodId(ferr, &PyId_flush, ""); if (res == NULL) PyErr_Clear(); else Py_DECREF(res); if (has_tb) return; display_stack: #ifdef WITH_THREAD /* PyGILState_GetThisThreadState() works even if the GIL was released */ tstate = PyGILState_GetThisThreadState(); #else tstate = PyThreadState_GET(); #endif if (tstate == NULL) { /* _Py_DumpTracebackThreads() requires the thread state to display * frames */ return; } fputc('\n', stderr); fflush(stderr); /* display the current Python stack */ _Py_DumpTracebackThreads(fd, tstate->interp, tstate); }