Line data Source code
1 :
2 : /* Support for dynamic loading of extension modules */
3 :
4 : #include "Python.h"
5 : #include "pycore_call.h"
6 : #include "pycore_pystate.h"
7 : #include "pycore_runtime.h"
8 :
9 : /* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
10 : supported on this platform. configure will then compile and link in one
11 : of the dynload_*.c files, as appropriate. We will call a function in
12 : those modules to get a function pointer to the module's init function.
13 : */
14 : #ifdef HAVE_DYNAMIC_LOADING
15 :
16 : #include "importdl.h"
17 :
18 : #ifdef MS_WINDOWS
19 : extern dl_funcptr _PyImport_FindSharedFuncptrWindows(const char *prefix,
20 : const char *shortname,
21 : PyObject *pathname,
22 : FILE *fp);
23 : #else
24 : extern dl_funcptr _PyImport_FindSharedFuncptr(const char *prefix,
25 : const char *shortname,
26 : const char *pathname, FILE *fp);
27 : #endif
28 :
29 : static const char * const ascii_only_prefix = "PyInit";
30 : static const char * const nonascii_prefix = "PyInitU";
31 :
32 : /* Get the variable part of a module's export symbol name.
33 : * Returns a bytes instance. For non-ASCII-named modules, the name is
34 : * encoded as per PEP 489.
35 : * The hook_prefix pointer is set to either ascii_only_prefix or
36 : * nonascii_prefix, as appropriate.
37 : */
38 : static PyObject *
39 29403 : get_encoded_name(PyObject *name, const char **hook_prefix) {
40 : PyObject *tmp;
41 29403 : PyObject *encoded = NULL;
42 29403 : PyObject *modname = NULL;
43 : Py_ssize_t name_len, lastdot;
44 :
45 : /* Get the short name (substring after last dot) */
46 29403 : name_len = PyUnicode_GetLength(name);
47 29403 : if (name_len < 0) {
48 0 : return NULL;
49 : }
50 29403 : lastdot = PyUnicode_FindChar(name, '.', 0, name_len, -1);
51 29403 : if (lastdot < -1) {
52 0 : return NULL;
53 29403 : } else if (lastdot >= 0) {
54 3 : tmp = PyUnicode_Substring(name, lastdot + 1, name_len);
55 3 : if (tmp == NULL)
56 0 : return NULL;
57 3 : name = tmp;
58 : /* "name" now holds a new reference to the substring */
59 : } else {
60 29400 : Py_INCREF(name);
61 : }
62 :
63 : /* Encode to ASCII or Punycode, as needed */
64 29403 : encoded = PyUnicode_AsEncodedString(name, "ascii", NULL);
65 29403 : if (encoded != NULL) {
66 29397 : *hook_prefix = ascii_only_prefix;
67 : } else {
68 6 : if (PyErr_ExceptionMatches(PyExc_UnicodeEncodeError)) {
69 6 : PyErr_Clear();
70 6 : encoded = PyUnicode_AsEncodedString(name, "punycode", NULL);
71 6 : if (encoded == NULL) {
72 0 : goto error;
73 : }
74 6 : *hook_prefix = nonascii_prefix;
75 : } else {
76 0 : goto error;
77 : }
78 : }
79 :
80 : /* Replace '-' by '_' */
81 29403 : modname = _PyObject_CallMethod(encoded, &_Py_ID(replace), "cc", '-', '_');
82 29403 : if (modname == NULL)
83 0 : goto error;
84 :
85 29403 : Py_DECREF(name);
86 29403 : Py_DECREF(encoded);
87 29403 : return modname;
88 0 : error:
89 0 : Py_DECREF(name);
90 0 : Py_XDECREF(encoded);
91 0 : return NULL;
92 : }
93 :
94 : PyObject *
95 29404 : _PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *fp)
96 : {
97 : #ifndef MS_WINDOWS
98 29404 : PyObject *pathbytes = NULL;
99 : #endif
100 29404 : PyObject *name_unicode = NULL, *name = NULL, *path = NULL, *m = NULL;
101 : const char *name_buf, *hook_prefix;
102 : const char *oldcontext;
103 : dl_funcptr exportfunc;
104 : PyModuleDef *def;
105 : PyModInitFunction p0;
106 :
107 29404 : name_unicode = PyObject_GetAttrString(spec, "name");
108 29404 : if (name_unicode == NULL) {
109 0 : return NULL;
110 : }
111 29404 : if (!PyUnicode_Check(name_unicode)) {
112 1 : PyErr_SetString(PyExc_TypeError,
113 : "spec.name must be a string");
114 1 : goto error;
115 : }
116 :
117 29403 : name = get_encoded_name(name_unicode, &hook_prefix);
118 29403 : if (name == NULL) {
119 0 : goto error;
120 : }
121 29403 : name_buf = PyBytes_AS_STRING(name);
122 :
123 29403 : path = PyObject_GetAttrString(spec, "origin");
124 29403 : if (path == NULL)
125 0 : goto error;
126 :
127 29403 : if (PySys_Audit("import", "OOOOO", name_unicode, path,
128 : Py_None, Py_None, Py_None) < 0) {
129 0 : goto error;
130 : }
131 :
132 : #ifdef MS_WINDOWS
133 : exportfunc = _PyImport_FindSharedFuncptrWindows(hook_prefix, name_buf,
134 : path, fp);
135 : #else
136 29403 : pathbytes = PyUnicode_EncodeFSDefault(path);
137 29403 : if (pathbytes == NULL)
138 0 : goto error;
139 29403 : exportfunc = _PyImport_FindSharedFuncptr(hook_prefix, name_buf,
140 29403 : PyBytes_AS_STRING(pathbytes),
141 : fp);
142 29403 : Py_DECREF(pathbytes);
143 : #endif
144 :
145 29403 : if (exportfunc == NULL) {
146 52 : if (!PyErr_Occurred()) {
147 : PyObject *msg;
148 5 : msg = PyUnicode_FromFormat(
149 : "dynamic module does not define "
150 : "module export function (%s_%s)",
151 : hook_prefix, name_buf);
152 5 : if (msg == NULL)
153 0 : goto error;
154 5 : PyErr_SetImportError(msg, name_unicode, path);
155 5 : Py_DECREF(msg);
156 : }
157 52 : goto error;
158 : }
159 :
160 29351 : p0 = (PyModInitFunction)exportfunc;
161 :
162 : /* Package context is needed for single-phase init */
163 29351 : oldcontext = _Py_PackageContext;
164 29351 : _Py_PackageContext = PyUnicode_AsUTF8(name_unicode);
165 29351 : if (_Py_PackageContext == NULL) {
166 0 : _Py_PackageContext = oldcontext;
167 0 : goto error;
168 : }
169 29351 : m = _PyImport_InitFunc_TrampolineCall(p0);
170 29351 : _Py_PackageContext = oldcontext;
171 :
172 29351 : if (m == NULL) {
173 4 : if (!PyErr_Occurred()) {
174 2 : PyErr_Format(
175 : PyExc_SystemError,
176 : "initialization of %s failed without raising an exception",
177 : name_buf);
178 : }
179 4 : goto error;
180 29347 : } else if (PyErr_Occurred()) {
181 2 : PyErr_Clear();
182 2 : PyErr_Format(
183 : PyExc_SystemError,
184 : "initialization of %s raised unreported exception",
185 : name_buf);
186 2 : m = NULL;
187 2 : goto error;
188 : }
189 29345 : if (Py_IS_TYPE(m, NULL)) {
190 : /* This can happen when a PyModuleDef is returned without calling
191 : * PyModuleDef_Init on it
192 : */
193 2 : PyErr_Format(PyExc_SystemError,
194 : "init function of %s returned uninitialized object",
195 : name_buf);
196 2 : m = NULL; /* prevent segfault in DECREF */
197 2 : goto error;
198 : }
199 29343 : if (PyObject_TypeCheck(m, &PyModuleDef_Type)) {
200 25496 : Py_DECREF(name_unicode);
201 25496 : Py_DECREF(name);
202 25496 : Py_DECREF(path);
203 25496 : return PyModule_FromDefAndSpec((PyModuleDef*)m, spec);
204 : }
205 :
206 : /* Fall back to single-phase init mechanism */
207 :
208 3847 : if (hook_prefix == nonascii_prefix) {
209 : /* don't allow legacy init for non-ASCII module names */
210 0 : PyErr_Format(
211 : PyExc_SystemError,
212 : "initialization of %s did not return PyModuleDef",
213 : name_buf);
214 0 : goto error;
215 : }
216 :
217 : /* Remember pointer to module init function. */
218 3847 : def = PyModule_GetDef(m);
219 3847 : if (def == NULL) {
220 0 : PyErr_Format(PyExc_SystemError,
221 : "initialization of %s did not return an extension "
222 : "module", name_buf);
223 0 : goto error;
224 : }
225 3847 : def->m_base.m_init = p0;
226 :
227 : /* Remember the filename as the __file__ attribute */
228 3847 : if (PyModule_AddObjectRef(m, "__file__", path) < 0) {
229 0 : PyErr_Clear(); /* Not important enough to report */
230 : }
231 :
232 3847 : PyObject *modules = PyImport_GetModuleDict();
233 3847 : if (_PyImport_FixupExtensionObject(m, name_unicode, path, modules) < 0)
234 0 : goto error;
235 :
236 3847 : Py_DECREF(name_unicode);
237 3847 : Py_DECREF(name);
238 3847 : Py_DECREF(path);
239 :
240 3847 : return m;
241 :
242 61 : error:
243 61 : Py_DECREF(name_unicode);
244 61 : Py_XDECREF(name);
245 61 : Py_XDECREF(path);
246 61 : Py_XDECREF(m);
247 61 : return NULL;
248 : }
249 :
250 : #endif /* HAVE_DYNAMIC_LOADING */
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