Staging
v0.8.1
v0.8.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Tip revision: f71d45a84a060a78ef6357897f659c2a60d27dcf authored by Barry Warsaw on 06 October 2009, 13:21:07 UTC
Bumping to 2.6.4rc1
Bumping to 2.6.4rc1
Tip revision: f71d45a
moduleobject.c
/* Module object implementation */
#include "Python.h"
#include "structmember.h"
typedef struct {
PyObject_HEAD
PyObject *md_dict;
} PyModuleObject;
static PyMemberDef module_members[] = {
{"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
{0}
};
PyObject *
PyModule_New(const char *name)
{
PyModuleObject *m;
PyObject *nameobj;
m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
if (m == NULL)
return NULL;
nameobj = PyString_FromString(name);
m->md_dict = PyDict_New();
if (m->md_dict == NULL || nameobj == NULL)
goto fail;
if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
goto fail;
if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
goto fail;
if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
goto fail;
Py_DECREF(nameobj);
PyObject_GC_Track(m);
return (PyObject *)m;
fail:
Py_XDECREF(nameobj);
Py_DECREF(m);
return NULL;
}
PyObject *
PyModule_GetDict(PyObject *m)
{
PyObject *d;
if (!PyModule_Check(m)) {
PyErr_BadInternalCall();
return NULL;
}
d = ((PyModuleObject *)m) -> md_dict;
if (d == NULL)
((PyModuleObject *)m) -> md_dict = d = PyDict_New();
return d;
}
char *
PyModule_GetName(PyObject *m)
{
PyObject *d;
PyObject *nameobj;
if (!PyModule_Check(m)) {
PyErr_BadArgument();
return NULL;
}
d = ((PyModuleObject *)m)->md_dict;
if (d == NULL ||
(nameobj = PyDict_GetItemString(d, "__name__")) == NULL ||
!PyString_Check(nameobj))
{
PyErr_SetString(PyExc_SystemError, "nameless module");
return NULL;
}
return PyString_AsString(nameobj);
}
char *
PyModule_GetFilename(PyObject *m)
{
PyObject *d;
PyObject *fileobj;
if (!PyModule_Check(m)) {
PyErr_BadArgument();
return NULL;
}
d = ((PyModuleObject *)m)->md_dict;
if (d == NULL ||
(fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
!PyString_Check(fileobj))
{
PyErr_SetString(PyExc_SystemError, "module filename missing");
return NULL;
}
return PyString_AsString(fileobj);
}
void
_PyModule_Clear(PyObject *m)
{
/* To make the execution order of destructors for global
objects a bit more predictable, we first zap all objects
whose name starts with a single underscore, before we clear
the entire dictionary. We zap them by replacing them with
None, rather than deleting them from the dictionary, to
avoid rehashing the dictionary (to some extent). */
Py_ssize_t pos;
PyObject *key, *value;
PyObject *d;
d = ((PyModuleObject *)m)->md_dict;
if (d == NULL)
return;
/* First, clear only names starting with a single underscore */
pos = 0;
while (PyDict_Next(d, &pos, &key, &value)) {
if (value != Py_None && PyString_Check(key)) {
char *s = PyString_AsString(key);
if (s[0] == '_' && s[1] != '_') {
if (Py_VerboseFlag > 1)
PySys_WriteStderr("# clear[1] %s\n", s);
PyDict_SetItem(d, key, Py_None);
}
}
}
/* Next, clear all names except for __builtins__ */
pos = 0;
while (PyDict_Next(d, &pos, &key, &value)) {
if (value != Py_None && PyString_Check(key)) {
char *s = PyString_AsString(key);
if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
if (Py_VerboseFlag > 1)
PySys_WriteStderr("# clear[2] %s\n", s);
PyDict_SetItem(d, key, Py_None);
}
}
}
/* Note: we leave __builtins__ in place, so that destructors
of non-global objects defined in this module can still use
builtins, in particularly 'None'. */
}
/* Methods */
static int
module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"name", "doc", NULL};
PyObject *dict, *name = Py_None, *doc = Py_None;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "S|O:module.__init__",
kwlist, &name, &doc))
return -1;
dict = m->md_dict;
if (dict == NULL) {
dict = PyDict_New();
if (dict == NULL)
return -1;
m->md_dict = dict;
}
if (PyDict_SetItemString(dict, "__name__", name) < 0)
return -1;
if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
return -1;
return 0;
}
static void
module_dealloc(PyModuleObject *m)
{
PyObject_GC_UnTrack(m);
if (m->md_dict != NULL) {
_PyModule_Clear((PyObject *)m);
Py_DECREF(m->md_dict);
}
Py_TYPE(m)->tp_free((PyObject *)m);
}
static PyObject *
module_repr(PyModuleObject *m)
{
char *name;
char *filename;
name = PyModule_GetName((PyObject *)m);
if (name == NULL) {
PyErr_Clear();
name = "?";
}
filename = PyModule_GetFilename((PyObject *)m);
if (filename == NULL) {
PyErr_Clear();
return PyString_FromFormat("<module '%s' (built-in)>", name);
}
return PyString_FromFormat("<module '%s' from '%s'>", name, filename);
}
/* We only need a traverse function, no clear function: If the module
is in a cycle, md_dict will be cleared as well, which will break
the cycle. */
static int
module_traverse(PyModuleObject *m, visitproc visit, void *arg)
{
Py_VISIT(m->md_dict);
return 0;
}
PyDoc_STRVAR(module_doc,
"module(name[, doc])\n\
\n\
Create a module object.\n\
The name must be a string; the optional doc argument can have any type.");
PyTypeObject PyModule_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"module", /* tp_name */
sizeof(PyModuleObject), /* tp_size */
0, /* tp_itemsize */
(destructor)module_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
(reprfunc)module_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE, /* tp_flags */
module_doc, /* tp_doc */
(traverseproc)module_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
module_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
(initproc)module_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
PyType_GenericNew, /* tp_new */
PyObject_GC_Del, /* tp_free */
};