cpython/Python/importdl.c at fe2506835fcb5c11a4e6db51fcab932a4076ce19 · python/cpython · GitHub

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/* Support for dynamic loading of extension modules */

#include "Python.h"

#include "pycore_call.h"

#include "pycore_import.h"

#include "pycore_pyerrors.h" // _PyErr_FormatFromCause()

#include "pycore_pystate.h"

#include "pycore_runtime.h"

/* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is

supported on this platform. configure will then compile and link in one

of the dynload_*.c files, as appropriate. We will call a function in

those modules to get a function pointer to the module's init function.

#ifdef HAVE_DYNAMIC_LOADING

#include "pycore_importdl.h"

#ifdef MS_WINDOWS

extern dl_funcptr _PyImport_FindSharedFuncptrWindows(const char *prefix,

const char *shortname,

PyObject *pathname,

FILE *fp);

#else

extern dl_funcptr _PyImport_FindSharedFuncptr(const char *prefix,

const char *shortname,

const char *pathname, FILE *fp);

#endif

static const char * const ascii_only_prefix = "PyInit";

static const char * const nonascii_prefix = "PyInitU";

/* Get the variable part of a module's export symbol name.

* Returns a bytes instance. For non-ASCII-named modules, the name is

* encoded as per PEP 489.

* The hook_prefix pointer is set to either ascii_only_prefix or

* nonascii_prefix, as appropriate.

static PyObject *

get_encoded_name(PyObject *name, const char **hook_prefix) {

PyObject *tmp;

PyObject *encoded = NULL;

PyObject *modname = NULL;

Py_ssize_t name_len, lastdot;

/* Get the short name (substring after last dot) */

name_len = PyUnicode_GetLength(name);

if (name_len < 0) {

return NULL;

}

lastdot = PyUnicode_FindChar(name, '.', 0, name_len, -1);

if (lastdot < -1) {

return NULL;

} else if (lastdot >= 0) {

tmp = PyUnicode_Substring(name, lastdot + 1, name_len);

if (tmp == NULL)

return NULL;

name = tmp;

/* "name" now holds a new reference to the substring */

} else {

Py_INCREF(name);

}

/* Encode to ASCII or Punycode, as needed */

encoded = PyUnicode_AsEncodedString(name, "ascii", NULL);

if (encoded != NULL) {

*hook_prefix = ascii_only_prefix;

} else {

if (PyErr_ExceptionMatches(PyExc_UnicodeEncodeError)) {

PyErr_Clear();

encoded = PyUnicode_AsEncodedString(name, "punycode", NULL);

if (encoded == NULL) {

goto error;

}

*hook_prefix = nonascii_prefix;

} else {

goto error;

}

/* Replace '-' by '_' */

modname = _PyObject_CallMethod(encoded, &_Py_ID(replace), "cc", '-', '_');

if (modname == NULL)

goto error;

Py_DECREF(name);

Py_DECREF(encoded);

return modname;

error:

Py_DECREF(name);

Py_XDECREF(encoded);

return NULL;

}

PyObject *

_PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *fp)

{

#ifndef MS_WINDOWS

PyObject *pathbytes = NULL;

#endif

PyObject *name_unicode = NULL, *name = NULL, *path = NULL, *m = NULL;

const char *name_buf, *hook_prefix;

const char *oldcontext, *newcontext;

dl_funcptr exportfunc;

PyModuleDef *def;

PyModInitFunction p0;

name_unicode = PyObject_GetAttrString(spec, "name");

if (name_unicode == NULL) {

return NULL;

}

if (!PyUnicode_Check(name_unicode)) {

PyErr_SetString(PyExc_TypeError,

"spec.name must be a string");

goto error;

}

newcontext = PyUnicode_AsUTF8(name_unicode);

if (newcontext == NULL) {

goto error;

}

name = get_encoded_name(name_unicode, &hook_prefix);

if (name == NULL) {

goto error;

}

name_buf = PyBytes_AS_STRING(name);

path = PyObject_GetAttrString(spec, "origin");

if (path == NULL)

goto error;

if (PySys_Audit("import", "OOOOO", name_unicode, path,

Py_None, Py_None, Py_None) < 0) {

goto error;

}

#ifdef MS_WINDOWS

exportfunc = _PyImport_FindSharedFuncptrWindows(hook_prefix, name_buf,

path, fp);

#else

pathbytes = PyUnicode_EncodeFSDefault(path);

if (pathbytes == NULL)

goto error;

exportfunc = _PyImport_FindSharedFuncptr(hook_prefix, name_buf,

PyBytes_AS_STRING(pathbytes),

fp);

Py_DECREF(pathbytes);

#endif

if (exportfunc == NULL) {

if (!PyErr_Occurred()) {

PyObject *msg;

msg = PyUnicode_FromFormat(

"dynamic module does not define "

"module export function (%s_%s)",

hook_prefix, name_buf);

if (msg == NULL)

goto error;

PyErr_SetImportError(msg, name_unicode, path);

Py_DECREF(msg);

}

goto error;

}

p0 = (PyModInitFunction)exportfunc;

/* Package context is needed for single-phase init */

oldcontext = _PyImport_SwapPackageContext(newcontext);

m = p0();

_PyImport_SwapPackageContext(oldcontext);

if (m == NULL) {

if (!PyErr_Occurred()) {

PyErr_Format(

PyExc_SystemError,

"initialization of %s failed without raising an exception",

name_buf);

}

goto error;

} else if (PyErr_Occurred()) {

_PyErr_FormatFromCause(

PyExc_SystemError,

"initialization of %s raised unreported exception",

name_buf);

m = NULL;

goto error;

}

if (Py_IS_TYPE(m, NULL)) {

/* This can happen when a PyModuleDef is returned without calling

* PyModuleDef_Init on it

PyErr_Format(PyExc_SystemError,

"init function of %s returned uninitialized object",

name_buf);

m = NULL; /* prevent segfault in DECREF */

goto error;

}

if (PyObject_TypeCheck(m, &PyModuleDef_Type)) {

Py_DECREF(name_unicode);

Py_DECREF(name);

Py_DECREF(path);

return PyModule_FromDefAndSpec((PyModuleDef*)m, spec);

}

/* Fall back to single-phase init mechanism */

if (_PyImport_CheckSubinterpIncompatibleExtensionAllowed(name_buf) < 0) {

goto error;

}

if (hook_prefix == nonascii_prefix) {

/* don't allow legacy init for non-ASCII module names */

PyErr_Format(

PyExc_SystemError,

"initialization of %s did not return PyModuleDef",

name_buf);

goto error;

}

/* Remember pointer to module init function. */

def = PyModule_GetDef(m);

if (def == NULL) {

PyErr_Format(PyExc_SystemError,

"initialization of %s did not return an extension "

"module", name_buf);

goto error;

}

def->m_base.m_init = p0;

/* Remember the filename as the __file__ attribute */

if (PyModule_AddObjectRef(m, "__file__", path) < 0) {

PyErr_Clear(); /* Not important enough to report */

}

PyObject *modules = PyImport_GetModuleDict();

if (_PyImport_FixupExtensionObject(m, name_unicode, path, modules) < 0)

goto error;

Py_DECREF(name_unicode);

Py_DECREF(name);

Py_DECREF(path);

return m;

error:

Py_DECREF(name_unicode);

Py_XDECREF(name);

Py_XDECREF(path);

Py_XDECREF(m);

return NULL;

}

#endif /* HAVE_DYNAMIC_LOADING */

cpython/Python/importdl.c at fe2506835fcb5c11a4e6db51fcab932a4076ce19 · python/cpython · GitHub

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