source: vendor/python/2.5/Objects/moduleobject.c@ 3225

/* 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;
        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;