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c1756f78 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 | ||
7e18a150 MW |
104 | int convbin(PyObject *o, void *pp) |
105 | { | |
106 | struct bin *r = pp; | |
107 | ||
108 | if (PyString_Check(o)) { | |
109 | r->p = PyString_AS_STRING(o); | |
110 | r->sz = PyString_GET_SIZE(o); | |
111 | return (1); | |
112 | } | |
113 | if (PyUnicode_Check(o)) { | |
114 | o = _PyUnicode_AsDefaultEncodedString(o, 0); | |
115 | if (!o) return (0); | |
116 | r->p = PyString_AS_STRING(o); | |
117 | r->sz = PyString_GET_SIZE(o); | |
118 | return (1); | |
119 | } | |
120 | return (PyObject_AsReadBuffer(o, &r->p, &r->sz) ? 0 : 1); | |
121 | } | |
122 | ||
c1756f78 MW |
123 | /*----- Miscellaneous utilities -------------------------------------------*/ |
124 | ||
125 | PyObject *abstract_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw) | |
126 | { | |
127 | PyErr_SetString(PyExc_TypeError, "can't instantiate this class"); | |
128 | return (0); | |
129 | } | |
130 | ||
131 | /*----- Saving and restoring exceptions ----------------------------------*/ | |
132 | ||
133 | void report_lost_exception_v(struct excinfo *exc, | |
134 | const char *why, va_list ap) | |
135 | { | |
136 | PyObject *hookfn = 0; | |
137 | PyObject *whyobj = 0; | |
138 | PyObject *obj = 0; | |
139 | ||
140 | /* Make sure we start out without a pending exception, or this will get | |
141 | * really confusing. | |
142 | */ | |
143 | assert(!PyErr_Occurred()); | |
144 | ||
145 | /* Format the explanation. */ | |
146 | if (why) whyobj = PyString_FromFormatV(why, ap); | |
147 | else { whyobj = Py_None; Py_INCREF(whyobj); } | |
148 | ||
149 | /* Find our home module's `lostexchook' function. This won't work if | |
150 | * there's no module, or the function isn't defined, or it's `None'. | |
151 | */ | |
152 | if (!home_module) goto sys; | |
153 | hookfn = PyObject_GetAttrString(home_module, "lostexchook"); | |
154 | if (hookfn == Py_None) goto sys; | |
155 | else if (hookfn) ; | |
156 | else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto ouch; | |
157 | else { PyErr_Clear(); goto sys; } | |
158 | ||
159 | /* Call the hook function. */ | |
160 | obj = PyObject_CallFunction(hookfn, "(OOOO)", | |
161 | whyobj, exc->ty, exc->val, exc->tb); | |
162 | if (!obj) goto ouch; | |
163 | goto end; | |
164 | ||
165 | /* Something went wrong reporting the problem. */ | |
166 | ouch: | |
167 | PySys_WriteStderr("\n!!! FAILURE REPORTING LOST EXCEPTION\n"); | |
168 | PyErr_Print(); | |
169 | /* drop through... */ | |
170 | ||
171 | /* There was no hook, so try to do something sensible using | |
172 | * `sys.excepthook'. | |
173 | */ | |
174 | sys: | |
175 | PySys_WriteStderr("\n!!! LOST EXCEPTION: %s\n", | |
176 | PyString_AS_STRING(whyobj)); | |
177 | RESTORE_EXCINFO(exc); | |
178 | PyErr_Print(); | |
179 | /* drop through... */ | |
180 | ||
181 | /* Clean up afterwards. */ | |
182 | end: | |
183 | Py_XDECREF(hookfn); | |
184 | Py_XDECREF(whyobj); | |
185 | Py_XDECREF(obj); | |
186 | } | |
187 | ||
188 | void report_lost_exception(struct excinfo *exc, const char *why, ...) | |
189 | { | |
190 | va_list ap; | |
191 | ||
192 | va_start(ap, why); | |
193 | report_lost_exception_v(exc, why, ap); | |
194 | va_end(ap); | |
195 | } | |
196 | ||
197 | void stash_exception(struct excinfo *exc, const char *why, ...) | |
198 | { | |
199 | va_list ap; | |
200 | struct excinfo stash; | |
201 | ||
202 | if (!exc->ty) | |
203 | STASH_EXCINFO(exc); | |
204 | else { | |
205 | va_start(ap, why); | |
206 | STASH_EXCINFO(&stash); | |
207 | report_lost_exception_v(&stash, why, ap); | |
208 | va_end(ap); | |
209 | } | |
210 | } | |
211 | ||
212 | void restore_exception(struct excinfo *exc, const char *why, ...) | |
213 | { | |
214 | va_list ap; | |
215 | struct excinfo stash; | |
216 | ||
217 | if (!PyErr_Occurred()) | |
218 | RESTORE_EXCINFO(exc); | |
219 | else { | |
220 | va_start(ap, why); | |
221 | STASH_EXCINFO(&stash); | |
222 | report_lost_exception_v(exc, why, ap); | |
223 | RESTORE_EXCINFO(&stash); | |
224 | va_end(ap); | |
225 | } | |
226 | } | |
227 | ||
228 | /*----- Type definitions --------------------------------------------------*/ | |
229 | ||
230 | static const PyTypeObject emptytype = { 0 }; | |
231 | ||
232 | void *newtype(PyTypeObject *metaty, | |
233 | const PyTypeObject *skel, | |
234 | const char *name) | |
235 | { | |
236 | PyHeapTypeObject *ty = | |
237 | (PyHeapTypeObject *)_PyObject_GC_Malloc(_PyObject_VAR_SIZE(metaty, 0)); | |
238 | if (!skel) skel = &emptytype; | |
239 | memcpy(ty, skel, sizeof(*skel)); | |
c1756f78 MW |
240 | #define COPY(blah) do { \ |
241 | if (ty->ht_type.tp_as_##blah) { \ | |
242 | memcpy(&ty->as_##blah, \ | |
243 | ty->ht_type.tp_as_##blah, \ | |
244 | sizeof(ty->as_##blah)); \ | |
245 | ty->ht_type.tp_as_##blah = &ty->as_##blah; \ | |
246 | } \ | |
247 | } while (0) | |
248 | COPY(number); | |
249 | COPY(sequence); | |
250 | COPY(mapping); | |
251 | COPY(buffer); | |
252 | #undef COPY | |
253 | if (name) | |
254 | ty->ht_name = PyString_FromString(name); | |
255 | else if (ty->ht_type.tp_name) | |
256 | ty->ht_name = PyString_FromString(ty->ht_type.tp_name); | |
257 | if (ty->ht_name) | |
258 | ty->ht_type.tp_name = PyString_AS_STRING(ty->ht_name); | |
1b026fd1 | 259 | ty->ht_slots = 0; |
c1756f78 MW |
260 | (void)PyObject_INIT(&ty->ht_type, metaty); |
261 | Py_INCREF(metaty); | |
262 | return (ty); | |
263 | } | |
264 | ||
265 | void typeready(PyTypeObject *ty) | |
266 | { | |
267 | PyType_Ready(ty); | |
268 | PyDict_SetItemString(ty->tp_dict, "__module__", modname); | |
269 | } | |
270 | ||
747ddb1b MW |
271 | PyTypeObject *inittype(const PyTypeObject *tyskel, |
272 | PyTypeObject *base, PyTypeObject *meta) | |
c1756f78 MW |
273 | { |
274 | PyTypeObject *ty = newtype(meta, tyskel, 0); | |
747ddb1b | 275 | if (base) { ty->tp_base = base; Py_INCREF(base); } |
c1756f78 MW |
276 | ty->tp_flags |= Py_TPFLAGS_HEAPTYPE; |
277 | typeready(ty); | |
278 | return (ty); | |
279 | } | |
280 | ||
281 | /*----- Populating modules ------------------------------------------------*/ | |
282 | ||
283 | PyObject *mkexc(PyObject *mod, PyObject *base, | |
87fa2d56 | 284 | const char *name, const PyMethodDef *mm) |
c1756f78 MW |
285 | { |
286 | PyObject *nameobj = 0; | |
287 | PyObject *dict = 0; | |
288 | PyObject *exc = 0; | |
289 | PyObject *func = 0; | |
290 | PyObject *meth = 0; | |
291 | ||
292 | if ((dict = PyDict_New()) == 0) goto fail; | |
293 | ||
294 | if (mm) { | |
295 | while (mm->ml_name) { | |
87fa2d56 MW |
296 | if ((func = PyCFunction_NewEx((/*unconst*/ PyMethodDef *)mm, |
297 | 0, mod)) == 0 || | |
c1756f78 MW |
298 | (meth = PyMethod_New(func, 0, exc)) == 0 || |
299 | PyDict_SetItemString(dict, mm->ml_name, meth)) | |
300 | goto fail; | |
301 | Py_DECREF(func); func = 0; | |
302 | Py_DECREF(meth); meth = 0; | |
303 | mm++; | |
304 | } | |
305 | } | |
306 | ||
307 | if ((nameobj = PyString_FromFormat("%s.%s", | |
308 | PyModule_GetName(mod), | |
309 | name)) == 0 || | |
310 | (exc = PyErr_NewException(PyString_AS_STRING(nameobj), | |
311 | base, dict)) == 0) | |
312 | goto fail; | |
313 | ||
314 | done: | |
315 | Py_XDECREF(nameobj); | |
316 | Py_XDECREF(dict); | |
317 | return (exc); | |
318 | ||
319 | fail: | |
320 | Py_XDECREF(exc); | |
321 | Py_XDECREF(func); | |
322 | Py_XDECREF(meth); | |
323 | exc = 0; | |
324 | goto done; | |
325 | } | |
326 | ||
327 | void setconstants(PyObject *mod, const struct nameval *c) | |
328 | { | |
329 | PyObject *x; | |
330 | unsigned long u; | |
331 | ||
332 | while (c->name) { | |
333 | u = c->value; | |
334 | if (u <= LONG_MAX) x = PyInt_FromLong(u); | |
335 | else if (c->f&CF_SIGNED) x = PyInt_FromLong(-1 - (long)(ULONG_MAX - u)); | |
336 | else x = PyLong_FromUnsignedLong(u); | |
337 | PyModule_AddObject(mod, (/*unconst*/ char *)c->name, x); | |
338 | c++; | |
339 | } | |
340 | } | |
341 | ||
342 | /*----- Submodules --------------------------------------------------------*/ | |
343 | ||
344 | static PyMethodDef *global_methods; | |
345 | static size_t nmethods, methodsz; | |
346 | ||
347 | void addmethods(const PyMethodDef *m) | |
348 | { | |
349 | size_t n, want, newsz; | |
350 | ||
351 | for (n = 0; m[n].ml_name; n++); | |
352 | want = nmethods + n + 1; | |
353 | if (want > methodsz) { | |
354 | newsz = methodsz ? 2*methodsz : 16; | |
355 | while (want > newsz) newsz *= 2; | |
356 | if (!global_methods) | |
357 | global_methods = PyObject_Malloc(newsz*sizeof(PyMethodDef)); | |
358 | else | |
359 | global_methods = PyObject_Realloc(global_methods, | |
360 | newsz*sizeof(PyMethodDef)); | |
361 | assert(global_methods); | |
362 | methodsz = newsz; | |
363 | } | |
364 | memcpy(global_methods + nmethods, m, n*sizeof(PyMethodDef)); | |
365 | nmethods += n; | |
366 | global_methods[nmethods].ml_name = 0; | |
367 | } | |
368 | ||
369 | PyMethodDef *donemethods(void) { return (global_methods); } | |
370 | ||
371 | /*----- Low-level Python interface ----------------------------------------*/ | |
372 | ||
373 | static PyObject *meth__set_home_module(PyObject *me, PyObject *arg) | |
374 | { | |
375 | PyObject *mod; | |
376 | ||
377 | if (!PyArg_ParseTuple(arg, "O!:_set_home_module", &PyModule_Type, &mod)) | |
378 | return (0); | |
379 | Py_XDECREF(home_module); home_module = mod; Py_INCREF(home_module); | |
380 | RETURN_NONE; | |
381 | } | |
382 | ||
383 | static const PyMethodDef methods[] = { | |
384 | #define METHNAME(func) meth_##func | |
385 | METH (_set_home_module, "_set_home_module(MOD)") | |
386 | #undef METHNAME | |
387 | { 0 } | |
388 | }; | |
389 | ||
390 | void pyke_core_pyinit(void) { addmethods(methods); } | |
391 | void pyke_core_pyinsert(PyObject *mod) { ; } | |
392 | ||
393 | /*----- That's all, folks -------------------------------------------------*/ |