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cpython/Python/_warnings.c

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#include "Python.h"
#include "code.h" /* For DeprecationWarning about adding 'line'. */
#include "frameobject.h"
#define MODULE_NAME "_warnings"
#define DEFAULT_ACTION_NAME "default_action"
PyDoc_STRVAR(warnings__doc__,
MODULE_NAME " provides basic warning filtering support.\n"
"It is a helper module to speed up interpreter start-up.");
/* Both 'filters' and 'onceregistry' can be set in warnings.py;
get_warnings_attr() will reset these variables accordingly. */
static PyObject *_filters; /* List */
static PyObject *_once_registry; /* Dict */
static int
check_matched(PyObject *obj, PyObject *arg)
{
PyObject *result;
int rc;
if (obj == Py_None)
return 1;
result = PyObject_CallMethod(obj, "match", "O", arg);
if (result == NULL)
return -1;
rc = PyObject_IsTrue(result);
Py_DECREF(result);
return rc;
}
/*
Returns a new reference.
A NULL return value can mean false or an error.
*/
static PyObject *
get_warnings_attr(const char *attr)
{
static PyObject *warnings_str = NULL;
PyObject *all_modules;
PyObject *warnings_module;
int result;
if (warnings_str == NULL) {
warnings_str = PyString_InternFromString("warnings");
if (warnings_str == NULL)
return NULL;
}
all_modules = PyImport_GetModuleDict();
result = PyDict_Contains(all_modules, warnings_str);
if (result == -1 || result == 0)
return NULL;
warnings_module = PyDict_GetItem(all_modules, warnings_str);
if (!PyObject_HasAttrString(warnings_module, attr))
return NULL;
return PyObject_GetAttrString(warnings_module, attr);
}
static PyObject *
get_once_registry(void)
{
PyObject *registry;
registry = get_warnings_attr("onceregistry");
if (registry == NULL) {
if (PyErr_Occurred())
return NULL;
return _once_registry;
}
Py_DECREF(_once_registry);
_once_registry = registry;
return registry;
}
/* The item is a borrowed reference. */
static const char *
get_filter(PyObject *category, PyObject *text, Py_ssize_t lineno,
PyObject *module, PyObject **item)
{
PyObject *action, *m, *d;
Py_ssize_t i;
PyObject *warnings_filters;
warnings_filters = get_warnings_attr("filters");
if (warnings_filters == NULL) {
if (PyErr_Occurred())
return NULL;
}
else {
Py_DECREF(_filters);
_filters = warnings_filters;
}
if (!PyList_Check(_filters)) {
PyErr_SetString(PyExc_ValueError,
MODULE_NAME ".filters must be a list");
return NULL;
}
/* _filters could change while we are iterating over it. */
for (i = 0; i < PyList_GET_SIZE(_filters); i++) {
PyObject *tmp_item, *action, *msg, *cat, *mod, *ln_obj;
Py_ssize_t ln;
int is_subclass, good_msg, good_mod;
tmp_item = *item = PyList_GET_ITEM(_filters, i);
if (PyTuple_Size(tmp_item) != 5) {
PyErr_Format(PyExc_ValueError,
MODULE_NAME ".filters item %zd isn't a 5-tuple", i);
return NULL;
}
/* Python code: action, msg, cat, mod, ln = item */
action = PyTuple_GET_ITEM(tmp_item, 0);
msg = PyTuple_GET_ITEM(tmp_item, 1);
cat = PyTuple_GET_ITEM(tmp_item, 2);
mod = PyTuple_GET_ITEM(tmp_item, 3);
ln_obj = PyTuple_GET_ITEM(tmp_item, 4);
good_msg = check_matched(msg, text);
good_mod = check_matched(mod, module);
is_subclass = PyObject_IsSubclass(category, cat);
ln = PyInt_AsSsize_t(ln_obj);
if (good_msg == -1 || good_mod == -1 || is_subclass == -1 ||
(ln == -1 && PyErr_Occurred()))
return NULL;
if (good_msg && is_subclass && good_mod && (ln == 0 || lineno == ln))
return PyString_AsString(action);
}
m = PyImport_ImportModule(MODULE_NAME);
if (m == NULL)
return NULL;
d = PyModule_GetDict(m);
Py_DECREF(m);
if (d == NULL)
return NULL;
action = PyDict_GetItemString(d, DEFAULT_ACTION_NAME);
if (action != NULL)
return PyString_AsString(action);
PyErr_SetString(PyExc_ValueError,
MODULE_NAME "." DEFAULT_ACTION_NAME " not found");
return NULL;
}
static int
already_warned(PyObject *registry, PyObject *key, int should_set)
{
PyObject *already_warned;
if (key == NULL)
return -1;
already_warned = PyDict_GetItem(registry, key);
if (already_warned != NULL) {
int rc = PyObject_IsTrue(already_warned);
if (rc != 0)
return rc;
}
/* This warning wasn't found in the registry, set it. */
if (should_set)
return PyDict_SetItem(registry, key, Py_True);
return 0;
}
/* New reference. */
static PyObject *
normalize_module(PyObject *filename)
{
PyObject *module;
const char *mod_str;
Py_ssize_t len;
int rc = PyObject_IsTrue(filename);
if (rc == -1)
return NULL;
else if (rc == 0)
return PyString_FromString("<unknown>");
mod_str = PyString_AsString(filename);
if (mod_str == NULL)
return NULL;
len = PyString_Size(filename);
if (len < 0)
return NULL;
if (len >= 3 &&
strncmp(mod_str + (len - 3), ".py", 3) == 0) {
module = PyString_FromStringAndSize(mod_str, len-3);
}
else {
module = filename;
Py_INCREF(module);
}
return module;
}
static int
update_registry(PyObject *registry, PyObject *text, PyObject *category,
int add_zero)
{
PyObject *altkey, *zero = NULL;
int rc;
if (add_zero) {
zero = PyInt_FromLong(0);
if (zero == NULL)
return -1;
altkey = PyTuple_Pack(3, text, category, zero);
}
else
altkey = PyTuple_Pack(2, text, category);
rc = already_warned(registry, altkey, 1);
Py_XDECREF(zero);
Py_XDECREF(altkey);
return rc;
}
static void
show_warning(PyObject *filename, int lineno, PyObject *text, PyObject
*category, PyObject *sourceline)
{
PyObject *f_stderr;
PyObject *name;
char lineno_str[128];
PyOS_snprintf(lineno_str, sizeof(lineno_str), ":%d: ", lineno);
name = PyObject_GetAttrString(category, "__name__");
if (name == NULL) /* XXX Can an object lack a '__name__' attribute? */
return;
f_stderr = PySys_GetObject("stderr");
if (f_stderr == NULL) {
fprintf(stderr, "lost sys.stderr\n");
Py_DECREF(name);
return;
}
/* Print "filename:lineno: category: text\n" */
PyFile_WriteObject(filename, f_stderr, Py_PRINT_RAW);
PyFile_WriteString(lineno_str, f_stderr);
PyFile_WriteObject(name, f_stderr, Py_PRINT_RAW);
PyFile_WriteString(": ", f_stderr);
PyFile_WriteObject(text, f_stderr, Py_PRINT_RAW);
PyFile_WriteString("\n", f_stderr);
Py_XDECREF(name);
/* Print " source_line\n" */
if (sourceline) {
char *source_line_str = PyString_AS_STRING(sourceline);
while (*source_line_str == ' ' || *source_line_str == '\t' ||
*source_line_str == '\014')
source_line_str++;
PyFile_WriteString(source_line_str, f_stderr);
PyFile_WriteString("\n", f_stderr);
}
else
_Py_DisplaySourceLine(f_stderr, PyString_AS_STRING(filename),
lineno, 2);
PyErr_Clear();
}
static PyObject *
warn_explicit(PyObject *category, PyObject *message,
PyObject *filename, int lineno,
PyObject *module, PyObject *registry, PyObject *sourceline)
{
PyObject *key = NULL, *text = NULL, *result = NULL, *lineno_obj = NULL;
PyObject *item = Py_None;
const char *action;
int rc;
if (registry && !PyDict_Check(registry) && (registry != Py_None)) {
PyErr_SetString(PyExc_TypeError, "'registry' must be a dict");
return NULL;
}
/* Normalize module. */
if (module == NULL) {
module = normalize_module(filename);
if (module == NULL)
return NULL;
}
else
Py_INCREF(module);
/* Normalize message. */
Py_INCREF(message); /* DECREF'ed in cleanup. */
rc = PyObject_IsInstance(message, PyExc_Warning);
if (rc == -1) {
goto cleanup;
}
if (rc == 1) {
text = PyObject_Str(message);
if (text == NULL)
goto cleanup;
category = (PyObject*)message->ob_type;
}
else {
text = message;
message = PyObject_CallFunction(category, "O", message);
if (message == NULL)
goto cleanup;
}
lineno_obj = PyInt_FromLong(lineno);
if (lineno_obj == NULL)
goto cleanup;
/* Create key. */
key = PyTuple_Pack(3, text, category, lineno_obj);
if (key == NULL)
goto cleanup;
if ((registry != NULL) && (registry != Py_None)) {
rc = already_warned(registry, key, 0);
if (rc == -1)
goto cleanup;
else if (rc == 1)
goto return_none;
/* Else this warning hasn't been generated before. */
}
action = get_filter(category, text, lineno, module, &item);
if (action == NULL)
goto cleanup;
if (strcmp(action, "error") == 0) {
PyErr_SetObject(category, message);
goto cleanup;
}
/* Store in the registry that we've been here, *except* when the action
is "always". */
rc = 0;
if (strcmp(action, "always") != 0) {
if (registry != NULL && registry != Py_None &&
PyDict_SetItem(registry, key, Py_True) < 0)
goto cleanup;
else if (strcmp(action, "ignore") == 0)
goto return_none;
else if (strcmp(action, "once") == 0) {
if (registry == NULL || registry == Py_None) {
registry = get_once_registry();
if (registry == NULL)
goto cleanup;
}
/* _once_registry[(text, category)] = 1 */
rc = update_registry(registry, text, category, 0);
}
else if (strcmp(action, "module") == 0) {
/* registry[(text, category, 0)] = 1 */
if (registry != NULL && registry != Py_None)
rc = update_registry(registry, text, category, 0);
}
else if (strcmp(action, "default") != 0) {
PyObject *to_str = PyObject_Str(item);
const char *err_str = "???";
if (to_str != NULL)
err_str = PyString_AS_STRING(to_str);
PyErr_Format(PyExc_RuntimeError,
"Unrecognized action (%s) in warnings.filters:\n %s",
action, err_str);
Py_XDECREF(to_str);
goto cleanup;
}
}
if (rc == 1) /* Already warned for this module. */
goto return_none;
if (rc == 0) {
PyObject *show_fxn = get_warnings_attr("showwarning");
if (show_fxn == NULL) {
if (PyErr_Occurred())
goto cleanup;
show_warning(filename, lineno, text, category, sourceline);
}
else {
const char *msg = "functions overriding warnings.showwarning() "
"must support the 'line' argument";
const char *text_char = PyString_AS_STRING(text);
if (strcmp(msg, text_char) == 0) {
/* Prevent infinite recursion by using built-in implementation
of showwarning(). */
show_warning(filename, lineno, text, category, sourceline);
}
else {
PyObject *check_fxn;
PyObject *defaults;
PyObject *res;
if (PyMethod_Check(show_fxn))
check_fxn = PyMethod_Function(show_fxn);
else if (PyFunction_Check(show_fxn))
check_fxn = show_fxn;
else {
PyErr_SetString(PyExc_TypeError,
"warnings.showwarning() must be set to a "
"function or method");
Py_DECREF(show_fxn);
goto cleanup;
}
defaults = PyFunction_GetDefaults(check_fxn);
/* A proper implementation of warnings.showwarning() should
have at least two default arguments. */
if ((defaults == NULL) || (PyTuple_Size(defaults) < 2)) {
PyCodeObject *code = (PyCodeObject *)
PyFunction_GetCode(check_fxn);
if (!(code->co_flags & CO_VARARGS)) {
if (PyErr_WarnEx(PyExc_DeprecationWarning, msg, 1) <
0) {
Py_DECREF(show_fxn);
goto cleanup;
}
}
}
res = PyObject_CallFunctionObjArgs(show_fxn, message, category,
filename, lineno_obj,
NULL);
Py_DECREF(show_fxn);
Py_XDECREF(res);
if (res == NULL)
goto cleanup;
}
}
}
else /* if (rc == -1) */
goto cleanup;
return_none:
result = Py_None;
Py_INCREF(result);
cleanup:
Py_XDECREF(key);
Py_XDECREF(text);
Py_XDECREF(lineno_obj);
Py_DECREF(module);
Py_XDECREF(message);
return result; /* Py_None or NULL. */
}
/* filename, module, and registry are new refs, globals is borrowed */
/* 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;
while (--stack_level > 0 && f != NULL)
f = f->f_back;
if (f == NULL) {
globals = PyThreadState_Get()->interp->sysdict;
*lineno = 1;
}
else {
globals = f->f_globals;
*lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
}
*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 = PyString_FromString("<string>");
if (*module == NULL)
goto handle_error;
}
else
Py_INCREF(*module);
/* Setup filename. */
*filename = PyDict_GetItemString(globals, "__file__");
if (*filename != NULL) {
Py_ssize_t len = PyString_Size(*filename);
const char *file_str = PyString_AsString(*filename);
if (file_str == NULL || (len < 0 && PyErr_Occurred()))
goto handle_error;
/* if filename.lower().endswith((".pyc", ".pyo")): */
if (len >= 4 &&
file_str[len-4] == '.' &&
tolower(file_str[len-3]) == 'p' &&
tolower(file_str[len-2]) == 'y' &&
(tolower(file_str[len-1]) == 'c' ||
tolower(file_str[len-1]) == 'o'))
{
*filename = PyString_FromStringAndSize(file_str, len-1);
if (*filename == NULL)
goto handle_error;
}
else
Py_INCREF(*filename);
}
else {
const char *module_str = PyString_AsString(*module);
if (module_str && strcmp(module_str, "__main__") == 0) {
PyObject *argv = PySys_GetObject("argv");
if (argv != NULL && 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_DECREF(*filename);
*filename = PyString_FromString("__main__");
if (*filename == NULL)
goto handle_error;
}
}
else {
/* embedded interpreters don't have sys.argv, see bug #839151 */
*filename = PyString_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 PyObject *
get_category(PyObject *message, PyObject *category)
{
int rc;
/* Get category. */
rc = PyObject_IsInstance(message, PyExc_Warning);
if (rc == -1)
return NULL;
if (rc == 1)
category = (PyObject*)message->ob_type;
else if (category == NULL)
category = PyExc_UserWarning;
/* Validate category. */
rc = PyObject_IsSubclass(category, PyExc_Warning);
if (rc == -1)
return NULL;
if (rc == 0) {
PyErr_SetString(PyExc_ValueError,
"category is not a subclass of Warning");
return NULL;
}
return category;
}
static PyObject *
do_warn(PyObject *message, PyObject *category, Py_ssize_t stack_level)
{
PyObject *filename, *module, *registry, *res;
int lineno;
if (!setup_context(stack_level, &filename, &lineno, &module, &registry))
return NULL;
res = warn_explicit(category, message, filename, lineno, module, registry,
NULL);
Py_DECREF(filename);
Py_DECREF(registry);
Py_DECREF(module);
return res;
}
static PyObject *
warnings_warn(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kw_list[] = { "message", "category", "stacklevel", 0 };
PyObject *message, *category = NULL;
Py_ssize_t stack_level = 1;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|On:warn", kw_list,
&message, &category, &stack_level))
return NULL;
category = get_category(message, category);
if (category == NULL)
return NULL;
return do_warn(message, category, stack_level);
}
static PyObject *
warnings_warn_explicit(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwd_list[] = {"message", "category", "filename", "lineno",
"module", "registry", "module_globals", 0};
PyObject *message;
PyObject *category;
PyObject *filename;
int lineno;
PyObject *module = NULL;
PyObject *registry = NULL;
PyObject *module_globals = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOi|OOO:warn_explicit",
kwd_list, &message, &category, &filename, &lineno, &module,
&registry, &module_globals))
return NULL;
if (module_globals) {
static PyObject *get_source_name = NULL;
static PyObject *splitlines_name = NULL;
PyObject *loader;
PyObject *module_name;
PyObject *source;
PyObject *source_list;
PyObject *source_line;
PyObject *returned;
if (get_source_name == NULL) {
get_source_name = PyString_InternFromString("get_source");
if (!get_source_name)
return NULL;
}
if (splitlines_name == NULL) {
splitlines_name = PyString_InternFromString("splitlines");
if (!splitlines_name)
return NULL;
}
/* Check/get the requisite pieces needed for the loader. */
loader = PyDict_GetItemString(module_globals, "__loader__");
module_name = PyDict_GetItemString(module_globals, "__name__");
if (loader == NULL || module_name == NULL)
goto standard_call;
/* Make sure the loader implements the optional get_source() method. */
if (!PyObject_HasAttrString(loader, "get_source"))
goto standard_call;
/* Call get_source() to get the source code. */
source = PyObject_CallMethodObjArgs(loader, get_source_name,
module_name, NULL);
if (!source)
return NULL;
else if (source == Py_None) {
Py_DECREF(Py_None);
goto standard_call;
}
/* Split the source into lines. */
source_list = PyObject_CallMethodObjArgs(source, splitlines_name,
NULL);
Py_DECREF(source);
if (!source_list)
return NULL;
/* Get the source line. */
source_line = PyList_GetItem(source_list, lineno-1);
if (!source_line) {
Py_DECREF(source_list);
return NULL;
}
/* Handle the warning. */
returned = warn_explicit(category, message, filename, lineno, module,
registry, source_line);
Py_DECREF(source_list);
return returned;
}
standard_call:
return warn_explicit(category, message, filename, lineno, module,
registry, NULL);
}
/* Function to issue a warning message; may raise an exception. */
int
PyErr_WarnEx(PyObject *category, const char *text, Py_ssize_t stack_level)
{
PyObject *res;
PyObject *message = PyString_FromString(text);
if (message == NULL)
return -1;
if (category == NULL)
category = PyExc_RuntimeWarning;
res = do_warn(message, category, stack_level);
Py_DECREF(message);
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 *text)
{
return PyErr_WarnEx(category, text, 1);
}
/* Warning with explicit origin */
int
PyErr_WarnExplicit(PyObject *category, const char *text,
const char *filename_str, int lineno,
const char *module_str, PyObject *registry)
{
PyObject *res;
PyObject *message = PyString_FromString(text);
PyObject *filename = PyString_FromString(filename_str);
PyObject *module = NULL;
int ret = -1;
if (message == NULL || filename == NULL)
goto exit;
if (module_str != NULL) {
module = PyString_FromString(module_str);
if (module == NULL)
goto exit;
}
if (category == NULL)
category = PyExc_RuntimeWarning;
res = warn_explicit(category, message, filename, lineno, module, registry,
NULL);
if (res == NULL)
goto exit;
Py_DECREF(res);
ret = 0;
exit:
Py_XDECREF(message);
Py_XDECREF(module);
Py_XDECREF(filename);
return ret;
}
PyDoc_STRVAR(warn_doc,
"Issue a warning, or maybe ignore it or raise an exception.");
PyDoc_STRVAR(warn_explicit_doc,
"Low-level inferface to warnings functionality.");
static PyMethodDef warnings_functions[] = {
{"warn", (PyCFunction)warnings_warn, METH_VARARGS | METH_KEYWORDS,
warn_doc},
{"warn_explicit", (PyCFunction)warnings_warn_explicit,
METH_VARARGS | METH_KEYWORDS, warn_explicit_doc},
/* XXX(brett.cannon): add showwarning? */
/* XXX(brett.cannon): Reasonable to add formatwarning? */
{NULL, NULL} /* sentinel */
};
static PyObject *
create_filter(PyObject *category, const char *action)
{
static PyObject *ignore_str = NULL;
static PyObject *error_str = NULL;
static PyObject *default_str = NULL;
PyObject *action_obj = NULL;
PyObject *lineno, *result;
if (!strcmp(action, "ignore")) {
if (ignore_str == NULL) {
ignore_str = PyString_InternFromString("ignore");
if (ignore_str == NULL)
return NULL;
}
action_obj = ignore_str;
}
else if (!strcmp(action, "error")) {
if (error_str == NULL) {
error_str = PyString_InternFromString("error");
if (error_str == NULL)
return NULL;
}
action_obj = error_str;
}
else if (!strcmp(action, "default")) {
if (default_str == NULL) {
default_str = PyString_InternFromString("default");
if (default_str == NULL)
return NULL;
}
action_obj = default_str;
}
else {
Py_FatalError("unknown action");
}
/* This assumes the line number is zero for now. */
lineno = PyInt_FromLong(0);
if (lineno == NULL)
return NULL;
result = PyTuple_Pack(5, action_obj, Py_None, category, Py_None, lineno);
Py_DECREF(lineno);
return result;
}
static PyObject *
init_filters(void)
{
PyObject *filters = PyList_New(3);
const char *bytes_action;
if (filters == NULL)
return NULL;
PyList_SET_ITEM(filters, 0,
create_filter(PyExc_PendingDeprecationWarning, "ignore"));
PyList_SET_ITEM(filters, 1, create_filter(PyExc_ImportWarning, "ignore"));
if (Py_BytesWarningFlag > 1)
bytes_action = "error";
else if (Py_BytesWarningFlag)
bytes_action = "default";
else
bytes_action = "ignore";
PyList_SET_ITEM(filters, 2, create_filter(PyExc_BytesWarning,
bytes_action));
if (PyList_GET_ITEM(filters, 0) == NULL ||
PyList_GET_ITEM(filters, 1) == NULL ||
PyList_GET_ITEM(filters, 2) == NULL) {
Py_DECREF(filters);
return NULL;
}
return filters;
}
PyMODINIT_FUNC
_PyWarnings_Init(void)
{
PyObject *m, *default_action;
m = Py_InitModule3(MODULE_NAME, warnings_functions, warnings__doc__);
if (m == NULL)
return;
_filters = init_filters();
if (_filters == NULL)
return;
Py_INCREF(_filters);
if (PyModule_AddObject(m, "filters", _filters) < 0)
return;
_once_registry = PyDict_New();
if (_once_registry == NULL)
return;
Py_INCREF(_once_registry);
if (PyModule_AddObject(m, "once_registry", _once_registry) < 0)
return;
default_action = PyString_InternFromString("default");
if (default_action == NULL)
return;
if (PyModule_AddObject(m, DEFAULT_ACTION_NAME, default_action) < 0)
return;
}
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