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361fd0e6 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * Pyke: the Python Kit for Extensions | |
4 | * | |
5 | * (c) 2019 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of Pyke: the Python Kit for Extensions. | |
11 | * | |
12 | * Pyke is free software: you can redistribute it and/or modify it under | |
13 | * the terms of the GNU General Public License as published by the Free | |
14 | * Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * Pyke is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with Pyke. If not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | */ | |
26 | ||
27 | /*----- Header files ------------------------------------------------------*/ | |
28 | ||
29 | #include "pyke.h" | |
30 | ||
31 | /*----- External variables ------------------------------------------------*/ | |
32 | ||
33 | PyObject *modname; | |
34 | PyObject *home_module; | |
35 | ||
36 | /*----- Conversions -------------------------------------------------------*/ | |
37 | ||
38 | PyObject *getulong(unsigned long w) | |
39 | { | |
40 | if (w <= LONG_MAX) return (PyInt_FromLong(w)); | |
41 | else return (PyLong_FromUnsignedLong(w)); | |
42 | } | |
43 | ||
44 | PyObject *getbool(int b) | |
45 | { if (b) RETURN_TRUE; else RETURN_FALSE; } | |
46 | ||
47 | int convulong(PyObject *o, void *pp) | |
48 | { | |
49 | long i; | |
50 | unsigned long *p = pp; | |
51 | PyObject *t; | |
52 | ||
53 | if (!o) VALERR("can't delete"); | |
54 | if (PyInt_Check(o)) { | |
55 | i = PyInt_AS_LONG(o); | |
56 | if (i < 0) VALERR("must be nonnegative"); | |
57 | *p = i; | |
58 | } else { | |
59 | if ((t = PyNumber_Long(o)) == 0) goto end; | |
60 | *p = PyLong_AsUnsignedLong(t); | |
61 | Py_DECREF(t); | |
62 | if (PyErr_Occurred()) goto end; | |
63 | } | |
64 | return (1); | |
65 | end: | |
66 | return (0); | |
67 | } | |
68 | ||
69 | int convuint(PyObject *o, void *pp) | |
70 | { | |
71 | unsigned long u; | |
72 | unsigned *p = pp; | |
73 | ||
74 | if (!convulong(o, &u)) goto end; | |
75 | if (u > UINT_MAX) VALERR("out of range"); | |
76 | *p = u; | |
77 | return (1); | |
78 | end: | |
79 | return (0); | |
80 | } | |
81 | ||
82 | int convszt(PyObject *o, void *pp) | |
83 | { | |
84 | unsigned long u; | |
85 | size_t *p = pp; | |
86 | ||
87 | if (!convulong(o, &u)) goto end; | |
88 | if (u > ~(size_t)0) VALERR("out of range"); | |
89 | *p = u; | |
90 | return (1); | |
91 | end: | |
92 | return (0); | |
93 | } | |
94 | ||
95 | int convbool(PyObject *o, void *pp) | |
96 | { | |
97 | if (!o) VALERR("can't delete"); | |
98 | *(int *)pp = PyObject_IsTrue(o); | |
99 | return (1); | |
100 | end: | |
101 | return (0); | |
102 | } | |
103 | ||
104 | /*----- Miscellaneous utilities -------------------------------------------*/ | |
105 | ||
106 | PyObject *abstract_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw) | |
107 | { | |
108 | PyErr_SetString(PyExc_TypeError, "can't instantiate this class"); | |
109 | return (0); | |
110 | } | |
111 | ||
112 | /*----- Saving and restoring exceptions ----------------------------------*/ | |
113 | ||
114 | void report_lost_exception_v(struct excinfo *exc, | |
115 | const char *why, va_list ap) | |
116 | { | |
117 | PyObject *hookfn = 0; | |
118 | PyObject *whyobj = 0; | |
119 | PyObject *obj = 0; | |
120 | ||
121 | /* Make sure we start out without a pending exception, or this will get | |
122 | * really confusing. | |
123 | */ | |
124 | assert(!PyErr_Occurred()); | |
125 | ||
126 | /* Format the explanation. */ | |
127 | if (why) whyobj = PyString_FromFormatV(why, ap); | |
128 | else { whyobj = Py_None; Py_INCREF(whyobj); } | |
129 | ||
130 | /* Find our home module's `lostexchook' function. This won't work if | |
131 | * there's no module, or the function isn't defined, or it's `None'. | |
132 | */ | |
133 | if (!home_module) goto sys; | |
134 | hookfn = PyObject_GetAttrString(home_module, "lostexchook"); | |
135 | if (hookfn == Py_None) goto sys; | |
136 | else if (hookfn) ; | |
137 | else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto ouch; | |
138 | else { PyErr_Clear(); goto sys; } | |
139 | ||
140 | /* Call the hook function. */ | |
141 | obj = PyObject_CallFunction(hookfn, "(OOOO)", | |
142 | whyobj, exc->ty, exc->val, exc->tb); | |
143 | if (!obj) goto ouch; | |
144 | goto end; | |
145 | ||
146 | /* Something went wrong reporting the problem. */ | |
147 | ouch: | |
148 | PySys_WriteStderr("\n!!! FAILURE REPORTING LOST EXCEPTION\n"); | |
149 | PyErr_Print(); | |
150 | /* drop through... */ | |
151 | ||
152 | /* There was no hook, so try to do something sensible using | |
153 | * `sys.excepthook'. | |
154 | */ | |
155 | sys: | |
156 | PySys_WriteStderr("\n!!! LOST EXCEPTION: %s\n", | |
157 | PyString_AS_STRING(whyobj)); | |
158 | RESTORE_EXCINFO(exc); | |
159 | PyErr_Print(); | |
160 | /* drop through... */ | |
161 | ||
162 | /* Clean up afterwards. */ | |
163 | end: | |
164 | Py_XDECREF(hookfn); | |
165 | Py_XDECREF(whyobj); | |
166 | Py_XDECREF(obj); | |
167 | } | |
168 | ||
169 | void report_lost_exception(struct excinfo *exc, const char *why, ...) | |
170 | { | |
171 | va_list ap; | |
172 | ||
173 | va_start(ap, why); | |
174 | report_lost_exception_v(exc, why, ap); | |
175 | va_end(ap); | |
176 | } | |
177 | ||
178 | void stash_exception(struct excinfo *exc, const char *why, ...) | |
179 | { | |
180 | va_list ap; | |
181 | struct excinfo stash; | |
182 | ||
183 | if (!exc->ty) | |
184 | STASH_EXCINFO(exc); | |
185 | else { | |
186 | va_start(ap, why); | |
187 | STASH_EXCINFO(&stash); | |
188 | report_lost_exception_v(&stash, why, ap); | |
189 | va_end(ap); | |
190 | } | |
191 | } | |
192 | ||
193 | void restore_exception(struct excinfo *exc, const char *why, ...) | |
194 | { | |
195 | va_list ap; | |
196 | struct excinfo stash; | |
197 | ||
198 | if (!PyErr_Occurred()) | |
199 | RESTORE_EXCINFO(exc); | |
200 | else { | |
201 | va_start(ap, why); | |
202 | STASH_EXCINFO(&stash); | |
203 | report_lost_exception_v(exc, why, ap); | |
204 | RESTORE_EXCINFO(&stash); | |
205 | va_end(ap); | |
206 | } | |
207 | } | |
208 | ||
209 | /*----- Type definitions --------------------------------------------------*/ | |
210 | ||
211 | static const PyTypeObject emptytype = { 0 }; | |
212 | ||
213 | void *newtype(PyTypeObject *metaty, | |
214 | const PyTypeObject *skel, | |
215 | const char *name) | |
216 | { | |
217 | PyHeapTypeObject *ty = | |
218 | (PyHeapTypeObject *)_PyObject_GC_Malloc(_PyObject_VAR_SIZE(metaty, 0)); | |
219 | if (!skel) skel = &emptytype; | |
220 | memcpy(ty, skel, sizeof(*skel)); | |
221 | if (ty->ht_type.tp_base) Py_INCREF(ty->ht_type.tp_base); | |
222 | #define COPY(blah) do { \ | |
223 | if (ty->ht_type.tp_as_##blah) { \ | |
224 | memcpy(&ty->as_##blah, \ | |
225 | ty->ht_type.tp_as_##blah, \ | |
226 | sizeof(ty->as_##blah)); \ | |
227 | ty->ht_type.tp_as_##blah = &ty->as_##blah; \ | |
228 | } \ | |
229 | } while (0) | |
230 | COPY(number); | |
231 | COPY(sequence); | |
232 | COPY(mapping); | |
233 | COPY(buffer); | |
234 | #undef COPY | |
235 | if (name) | |
236 | ty->ht_name = PyString_FromString(name); | |
237 | else if (ty->ht_type.tp_name) | |
238 | ty->ht_name = PyString_FromString(ty->ht_type.tp_name); | |
239 | if (ty->ht_name) | |
240 | ty->ht_type.tp_name = PyString_AS_STRING(ty->ht_name); | |
241 | (void)PyObject_INIT(&ty->ht_type, metaty); | |
242 | Py_INCREF(metaty); | |
243 | return (ty); | |
244 | } | |
245 | ||
246 | void typeready(PyTypeObject *ty) | |
247 | { | |
248 | PyType_Ready(ty); | |
249 | PyDict_SetItemString(ty->tp_dict, "__module__", modname); | |
250 | } | |
251 | ||
252 | PyTypeObject *inittype(PyTypeObject *tyskel, PyTypeObject *meta) | |
253 | { | |
254 | PyTypeObject *ty = newtype(meta, tyskel, 0); | |
255 | ty->tp_flags |= Py_TPFLAGS_HEAPTYPE; | |
256 | typeready(ty); | |
257 | return (ty); | |
258 | } | |
259 | ||
260 | /*----- Populating modules ------------------------------------------------*/ | |
261 | ||
262 | PyObject *mkexc(PyObject *mod, PyObject *base, | |
637b9140 | 263 | const char *name, const PyMethodDef *mm) |
361fd0e6 MW |
264 | { |
265 | PyObject *nameobj = 0; | |
266 | PyObject *dict = 0; | |
267 | PyObject *exc = 0; | |
268 | PyObject *func = 0; | |
269 | PyObject *meth = 0; | |
270 | ||
271 | if ((dict = PyDict_New()) == 0) goto fail; | |
272 | ||
273 | if (mm) { | |
274 | while (mm->ml_name) { | |
637b9140 MW |
275 | if ((func = PyCFunction_NewEx((/*unconst*/ PyMethodDef *)mm, |
276 | 0, mod)) == 0 || | |
361fd0e6 MW |
277 | (meth = PyMethod_New(func, 0, exc)) == 0 || |
278 | PyDict_SetItemString(dict, mm->ml_name, meth)) | |
279 | goto fail; | |
280 | Py_DECREF(func); func = 0; | |
281 | Py_DECREF(meth); meth = 0; | |
282 | mm++; | |
283 | } | |
284 | } | |
285 | ||
286 | if ((nameobj = PyString_FromFormat("%s.%s", | |
287 | PyModule_GetName(mod), | |
288 | name)) == 0 || | |
289 | (exc = PyErr_NewException(PyString_AS_STRING(nameobj), | |
290 | base, dict)) == 0) | |
291 | goto fail; | |
292 | ||
293 | done: | |
294 | Py_XDECREF(nameobj); | |
295 | Py_XDECREF(dict); | |
296 | return (exc); | |
297 | ||
298 | fail: | |
299 | Py_XDECREF(exc); | |
300 | Py_XDECREF(func); | |
301 | Py_XDECREF(meth); | |
302 | exc = 0; | |
303 | goto done; | |
304 | } | |
305 | ||
306 | void setconstants(PyObject *mod, const struct nameval *c) | |
307 | { | |
308 | PyObject *x; | |
309 | unsigned long u; | |
310 | ||
311 | while (c->name) { | |
312 | u = c->value; | |
313 | if (u <= LONG_MAX) x = PyInt_FromLong(u); | |
314 | else if (c->f&CF_SIGNED) x = PyInt_FromLong(-1 - (long)(ULONG_MAX - u)); | |
315 | else x = PyLong_FromUnsignedLong(u); | |
316 | PyModule_AddObject(mod, (/*unconst*/ char *)c->name, x); | |
317 | c++; | |
318 | } | |
319 | } | |
320 | ||
321 | /*----- Submodules --------------------------------------------------------*/ | |
322 | ||
323 | static PyMethodDef *global_methods; | |
324 | static size_t nmethods, methodsz; | |
325 | ||
326 | void addmethods(const PyMethodDef *m) | |
327 | { | |
328 | size_t n, want, newsz; | |
329 | ||
330 | for (n = 0; m[n].ml_name; n++); | |
331 | want = nmethods + n + 1; | |
332 | if (want > methodsz) { | |
333 | newsz = methodsz ? 2*methodsz : 16; | |
334 | while (want > newsz) newsz *= 2; | |
335 | if (!global_methods) | |
336 | global_methods = PyObject_Malloc(newsz*sizeof(PyMethodDef)); | |
337 | else | |
338 | global_methods = PyObject_Realloc(global_methods, | |
339 | newsz*sizeof(PyMethodDef)); | |
340 | assert(global_methods); | |
341 | methodsz = newsz; | |
342 | } | |
343 | memcpy(global_methods + nmethods, m, n*sizeof(PyMethodDef)); | |
344 | nmethods += n; | |
345 | global_methods[nmethods].ml_name = 0; | |
346 | } | |
347 | ||
348 | PyMethodDef *donemethods(void) { return (global_methods); } | |
349 | ||
350 | /*----- Low-level Python interface ----------------------------------------*/ | |
351 | ||
352 | static PyObject *meth__set_home_module(PyObject *me, PyObject *arg) | |
353 | { | |
354 | PyObject *mod; | |
355 | ||
356 | if (!PyArg_ParseTuple(arg, "O!:_set_home_module", &PyModule_Type, &mod)) | |
357 | return (0); | |
358 | Py_XDECREF(home_module); home_module = mod; Py_INCREF(home_module); | |
359 | RETURN_NONE; | |
360 | } | |
361 | ||
362 | static const PyMethodDef methods[] = { | |
363 | #define METHNAME(func) meth_##func | |
364 | METH (_set_home_module, "_set_home_module(MOD)") | |
365 | #undef METHNAME | |
366 | { 0 } | |
367 | }; | |
368 | ||
369 | void pyke_core_pyinit(void) { addmethods(methods); } | |
370 | void pyke_core_pyinsert(PyObject *mod) { ; } | |
371 | ||
372 | /*----- That's all, folks -------------------------------------------------*/ |