/* 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(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). */ int 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", 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); } m->ob_type->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) { if (m->md_dict != NULL) return visit(m->md_dict, arg); 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 = { PyObject_HEAD_INIT(&PyType_Type) 0, /* ob_size */ "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 */ };