mirror of
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800dfee91a
svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r87251 | r.david.murray | 2010-12-14 18:06:25 -0500 (Tue, 14 Dec 2010) | 4 lines #4236: avoid possible Fatal Error when import is called from __del__ Patch by Simon Cross, crasher test code by Martin von Löwis. ........
415 lines
13 KiB
C
415 lines
13 KiB
C
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/* Module object implementation */
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#include "Python.h"
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#include "structmember.h"
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static Py_ssize_t max_module_number;
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typedef struct {
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PyObject_HEAD
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PyObject *md_dict;
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struct PyModuleDef *md_def;
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void *md_state;
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} PyModuleObject;
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static PyMemberDef module_members[] = {
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{"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
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{0}
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};
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static PyTypeObject moduledef_type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"moduledef", /* tp_name */
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sizeof(struct PyModuleDef), /* tp_size */
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0, /* tp_itemsize */
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};
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PyObject *
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PyModule_New(const char *name)
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{
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PyModuleObject *m;
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PyObject *nameobj;
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m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
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if (m == NULL)
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return NULL;
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m->md_def = NULL;
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m->md_state = NULL;
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nameobj = PyUnicode_FromString(name);
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m->md_dict = PyDict_New();
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if (m->md_dict == NULL || nameobj == NULL)
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goto fail;
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if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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goto fail;
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if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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goto fail;
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if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
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goto fail;
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Py_DECREF(nameobj);
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PyObject_GC_Track(m);
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return (PyObject *)m;
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fail:
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Py_XDECREF(nameobj);
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Py_DECREF(m);
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return NULL;
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}
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static char api_version_warning[] =
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"Python C API version mismatch for module %.100s:\
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This Python has API version %d, module %.100s has version %d.";
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PyObject *
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PyModule_Create2(struct PyModuleDef* module, int module_api_version)
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{
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PyObject *d, *v, *n;
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PyMethodDef *ml;
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const char* name;
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PyModuleObject *m;
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PyInterpreterState *interp = PyThreadState_Get()->interp;
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if (interp->modules == NULL)
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Py_FatalError("Python import machinery not initialized");
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if (PyType_Ready(&moduledef_type) < 0)
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return NULL;
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if (module->m_base.m_index == 0) {
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max_module_number++;
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Py_REFCNT(module) = 1;
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Py_TYPE(module) = &moduledef_type;
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module->m_base.m_index = max_module_number;
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}
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name = module->m_name;
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if (module_api_version != PYTHON_API_VERSION) {
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char message[512];
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PyOS_snprintf(message, sizeof(message),
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api_version_warning, name,
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PYTHON_API_VERSION, name,
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module_api_version);
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if (PyErr_WarnEx(PyExc_RuntimeWarning, message, 1))
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return NULL;
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}
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/* Make sure name is fully qualified.
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This is a bit of a hack: when the shared library is loaded,
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the module name is "package.module", but the module calls
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PyModule_Create*() with just "module" for the name. The shared
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library loader squirrels away the true name of the module in
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_Py_PackageContext, and PyModule_Create*() will substitute this
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(if the name actually matches).
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*/
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if (_Py_PackageContext != NULL) {
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char *p = strrchr(_Py_PackageContext, '.');
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if (p != NULL && strcmp(module->m_name, p+1) == 0) {
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name = _Py_PackageContext;
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_Py_PackageContext = NULL;
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}
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}
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if ((m = (PyModuleObject*)PyModule_New(name)) == NULL)
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return NULL;
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if (module->m_size > 0) {
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m->md_state = PyMem_MALLOC(module->m_size);
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if (!m->md_state) {
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PyErr_NoMemory();
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Py_DECREF(m);
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return NULL;
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}
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memset(m->md_state, 0, module->m_size);
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}
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d = PyModule_GetDict((PyObject*)m);
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if (module->m_methods != NULL) {
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n = PyUnicode_FromString(name);
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if (n == NULL)
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return NULL;
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for (ml = module->m_methods; ml->ml_name != NULL; ml++) {
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if ((ml->ml_flags & METH_CLASS) ||
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(ml->ml_flags & METH_STATIC)) {
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PyErr_SetString(PyExc_ValueError,
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"module functions cannot set"
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" METH_CLASS or METH_STATIC");
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Py_DECREF(n);
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return NULL;
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}
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v = PyCFunction_NewEx(ml, (PyObject*)m, n);
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if (v == NULL) {
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Py_DECREF(n);
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return NULL;
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}
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if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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Py_DECREF(v);
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Py_DECREF(n);
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return NULL;
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}
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Py_DECREF(v);
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}
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Py_DECREF(n);
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}
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if (module->m_doc != NULL) {
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v = PyUnicode_FromString(module->m_doc);
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if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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Py_XDECREF(v);
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return NULL;
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}
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Py_DECREF(v);
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}
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m->md_def = module;
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return (PyObject*)m;
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}
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PyObject *
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PyModule_GetDict(PyObject *m)
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{
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PyObject *d;
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if (!PyModule_Check(m)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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d = ((PyModuleObject *)m) -> md_dict;
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if (d == NULL)
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((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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return d;
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}
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const char *
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PyModule_GetName(PyObject *m)
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{
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PyObject *d;
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PyObject *nameobj;
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if (!PyModule_Check(m)) {
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PyErr_BadArgument();
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return NULL;
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}
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d = ((PyModuleObject *)m)->md_dict;
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if (d == NULL ||
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(nameobj = PyDict_GetItemString(d, "__name__")) == NULL ||
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!PyUnicode_Check(nameobj))
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{
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PyErr_SetString(PyExc_SystemError, "nameless module");
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return NULL;
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}
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return _PyUnicode_AsString(nameobj);
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}
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const char *
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PyModule_GetFilename(PyObject *m)
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{
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PyObject *d;
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PyObject *fileobj;
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if (!PyModule_Check(m)) {
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PyErr_BadArgument();
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return NULL;
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}
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d = ((PyModuleObject *)m)->md_dict;
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if (d == NULL ||
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(fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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!PyUnicode_Check(fileobj))
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{
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PyErr_SetString(PyExc_SystemError, "module filename missing");
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return NULL;
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}
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return _PyUnicode_AsString(fileobj);
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}
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PyModuleDef*
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PyModule_GetDef(PyObject* m)
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{
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if (!PyModule_Check(m)) {
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PyErr_BadArgument();
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return NULL;
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}
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return ((PyModuleObject *)m)->md_def;
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}
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void*
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PyModule_GetState(PyObject* m)
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{
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if (!PyModule_Check(m)) {
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PyErr_BadArgument();
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return NULL;
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}
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return ((PyModuleObject *)m)->md_state;
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}
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void
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_PyModule_Clear(PyObject *m)
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{
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/* To make the execution order of destructors for global
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objects a bit more predictable, we first zap all objects
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whose name starts with a single underscore, before we clear
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the entire dictionary. We zap them by replacing them with
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None, rather than deleting them from the dictionary, to
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avoid rehashing the dictionary (to some extent). */
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Py_ssize_t pos;
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PyObject *key, *value;
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PyObject *d;
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d = ((PyModuleObject *)m)->md_dict;
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if (d == NULL)
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return;
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/* First, clear only names starting with a single underscore */
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pos = 0;
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while (PyDict_Next(d, &pos, &key, &value)) {
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if (value != Py_None && PyUnicode_Check(key)) {
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const char *s = _PyUnicode_AsString(key);
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if (s[0] == '_' && s[1] != '_') {
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if (Py_VerboseFlag > 1)
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PySys_WriteStderr("# clear[1] %s\n", s);
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PyDict_SetItem(d, key, Py_None);
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}
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}
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}
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/* Next, clear all names except for __builtins__ */
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pos = 0;
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while (PyDict_Next(d, &pos, &key, &value)) {
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if (value != Py_None && PyUnicode_Check(key)) {
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const char *s = _PyUnicode_AsString(key);
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if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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if (Py_VerboseFlag > 1)
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PySys_WriteStderr("# clear[2] %s\n", s);
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PyDict_SetItem(d, key, Py_None);
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}
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}
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}
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/* Note: we leave __builtins__ in place, so that destructors
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of non-global objects defined in this module can still use
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builtins, in particularly 'None'. */
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}
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/* Methods */
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static int
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module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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{
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static char *kwlist[] = {"name", "doc", NULL};
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PyObject *dict, *name = Py_None, *doc = Py_None;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|O:module.__init__",
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kwlist, &name, &doc))
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return -1;
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dict = m->md_dict;
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if (dict == NULL) {
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dict = PyDict_New();
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if (dict == NULL)
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return -1;
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m->md_dict = dict;
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}
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if (PyDict_SetItemString(dict, "__name__", name) < 0)
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return -1;
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if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
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return -1;
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return 0;
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}
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static void
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module_dealloc(PyModuleObject *m)
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{
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PyObject_GC_UnTrack(m);
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if (m->md_def && m->md_def->m_free)
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m->md_def->m_free(m);
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if (m->md_dict != NULL) {
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_PyModule_Clear((PyObject *)m);
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Py_DECREF(m->md_dict);
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}
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if (m->md_state != NULL)
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PyMem_FREE(m->md_state);
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Py_TYPE(m)->tp_free((PyObject *)m);
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}
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static PyObject *
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module_repr(PyModuleObject *m)
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{
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const char *name;
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const char *filename;
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name = PyModule_GetName((PyObject *)m);
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if (name == NULL) {
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PyErr_Clear();
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name = "?";
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}
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filename = PyModule_GetFilename((PyObject *)m);
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if (filename == NULL) {
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PyErr_Clear();
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return PyUnicode_FromFormat("<module '%s' (built-in)>", name);
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}
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return PyUnicode_FromFormat("<module '%s' from '%s'>", name, filename);
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}
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static int
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module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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{
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if (m->md_def && m->md_def->m_traverse) {
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int res = m->md_def->m_traverse((PyObject*)m, visit, arg);
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if (res)
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return res;
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}
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Py_VISIT(m->md_dict);
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return 0;
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}
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static int
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module_clear(PyModuleObject *m)
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{
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if (m->md_def && m->md_def->m_clear) {
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int res = m->md_def->m_clear((PyObject*)m);
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if (res)
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return res;
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}
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Py_CLEAR(m->md_dict);
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return 0;
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}
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PyDoc_STRVAR(module_doc,
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"module(name[, doc])\n\
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\n\
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Create a module object.\n\
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The name must be a string; the optional doc argument can have any type.");
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PyTypeObject PyModule_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"module", /* tp_name */
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sizeof(PyModuleObject), /* tp_size */
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0, /* tp_itemsize */
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(destructor)module_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)module_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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PyObject_GenericSetAttr, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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Py_TPFLAGS_BASETYPE, /* tp_flags */
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module_doc, /* tp_doc */
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(traverseproc)module_traverse, /* tp_traverse */
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(inquiry)module_clear, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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module_members, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
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(initproc)module_init, /* tp_init */
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PyType_GenericAlloc, /* tp_alloc */
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PyType_GenericNew, /* tp_new */
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PyObject_GC_Del, /* tp_free */
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};
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