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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 | ||
be17c8c2 MW |
104 | int convbin(PyObject *o, void *pp) |
105 | { | |
106 | struct bin *r = pp; | |
107 | ||
cfb291f0 MW |
108 | if (BIN_CHECK(o)) { |
109 | r->p = BIN_PTR(o); | |
110 | r->sz = BIN_LEN(o); | |
be17c8c2 MW |
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 | ||
361fd0e6 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. */ | |
cfb291f0 | 146 | if (why) whyobj = TEXT_VFORMAT(why, ap); |
361fd0e6 MW |
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: | |
cfb291f0 | 175 | PySys_WriteStderr("\n!!! LOST EXCEPTION: %s\n", TEXT_PTR(whyobj)); |
361fd0e6 MW |
176 | RESTORE_EXCINFO(exc); |
177 | PyErr_Print(); | |
178 | /* drop through... */ | |
179 | ||
180 | /* Clean up afterwards. */ | |
181 | end: | |
182 | Py_XDECREF(hookfn); | |
183 | Py_XDECREF(whyobj); | |
184 | Py_XDECREF(obj); | |
185 | } | |
186 | ||
187 | void report_lost_exception(struct excinfo *exc, const char *why, ...) | |
188 | { | |
189 | va_list ap; | |
190 | ||
191 | va_start(ap, why); | |
192 | report_lost_exception_v(exc, why, ap); | |
193 | va_end(ap); | |
194 | } | |
195 | ||
196 | void stash_exception(struct excinfo *exc, const char *why, ...) | |
197 | { | |
198 | va_list ap; | |
199 | struct excinfo stash; | |
200 | ||
201 | if (!exc->ty) | |
202 | STASH_EXCINFO(exc); | |
203 | else { | |
204 | va_start(ap, why); | |
205 | STASH_EXCINFO(&stash); | |
206 | report_lost_exception_v(&stash, why, ap); | |
207 | va_end(ap); | |
208 | } | |
209 | } | |
210 | ||
211 | void restore_exception(struct excinfo *exc, const char *why, ...) | |
212 | { | |
213 | va_list ap; | |
214 | struct excinfo stash; | |
215 | ||
216 | if (!PyErr_Occurred()) | |
217 | RESTORE_EXCINFO(exc); | |
218 | else { | |
219 | va_start(ap, why); | |
220 | STASH_EXCINFO(&stash); | |
221 | report_lost_exception_v(exc, why, ap); | |
222 | RESTORE_EXCINFO(&stash); | |
223 | va_end(ap); | |
224 | } | |
225 | } | |
226 | ||
227 | /*----- Type definitions --------------------------------------------------*/ | |
228 | ||
229 | static const PyTypeObject emptytype = { 0 }; | |
230 | ||
231 | void *newtype(PyTypeObject *metaty, | |
232 | const PyTypeObject *skel, | |
233 | const char *name) | |
234 | { | |
235 | PyHeapTypeObject *ty = | |
236 | (PyHeapTypeObject *)_PyObject_GC_Malloc(_PyObject_VAR_SIZE(metaty, 0)); | |
237 | if (!skel) skel = &emptytype; | |
238 | memcpy(ty, skel, sizeof(*skel)); | |
361fd0e6 MW |
239 | #define COPY(blah) do { \ |
240 | if (ty->ht_type.tp_as_##blah) { \ | |
241 | memcpy(&ty->as_##blah, \ | |
242 | ty->ht_type.tp_as_##blah, \ | |
243 | sizeof(ty->as_##blah)); \ | |
244 | ty->ht_type.tp_as_##blah = &ty->as_##blah; \ | |
245 | } \ | |
246 | } while (0) | |
247 | COPY(number); | |
248 | COPY(sequence); | |
249 | COPY(mapping); | |
250 | COPY(buffer); | |
251 | #undef COPY | |
252 | if (name) | |
cfb291f0 | 253 | ty->ht_name = TEXT_FROMSTR(name); |
361fd0e6 | 254 | else if (ty->ht_type.tp_name) |
cfb291f0 MW |
255 | ty->ht_name = TEXT_FROMSTR(ty->ht_type.tp_name); |
256 | else | |
257 | ty->ht_name = 0; | |
361fd0e6 | 258 | if (ty->ht_name) |
cfb291f0 | 259 | ty->ht_type.tp_name = TEXT_STR(ty->ht_name); |
ecf7246c | 260 | ty->ht_slots = 0; |
361fd0e6 MW |
261 | (void)PyObject_INIT(&ty->ht_type, metaty); |
262 | Py_INCREF(metaty); | |
263 | return (ty); | |
264 | } | |
265 | ||
266 | void typeready(PyTypeObject *ty) | |
267 | { | |
268 | PyType_Ready(ty); | |
269 | PyDict_SetItemString(ty->tp_dict, "__module__", modname); | |
270 | } | |
271 | ||
ddd4720b MW |
272 | PyTypeObject *inittype(const PyTypeObject *tyskel, |
273 | PyTypeObject *base, PyTypeObject *meta) | |
361fd0e6 MW |
274 | { |
275 | PyTypeObject *ty = newtype(meta, tyskel, 0); | |
ddd4720b | 276 | if (base) { ty->tp_base = base; Py_INCREF(base); } |
361fd0e6 MW |
277 | ty->tp_flags |= Py_TPFLAGS_HEAPTYPE; |
278 | typeready(ty); | |
279 | return (ty); | |
280 | } | |
281 | ||
282 | /*----- Populating modules ------------------------------------------------*/ | |
283 | ||
284 | PyObject *mkexc(PyObject *mod, PyObject *base, | |
637b9140 | 285 | const char *name, const PyMethodDef *mm) |
361fd0e6 MW |
286 | { |
287 | PyObject *nameobj = 0; | |
288 | PyObject *dict = 0; | |
289 | PyObject *exc = 0; | |
290 | PyObject *func = 0; | |
291 | PyObject *meth = 0; | |
292 | ||
293 | if ((dict = PyDict_New()) == 0) goto fail; | |
294 | ||
295 | if (mm) { | |
296 | while (mm->ml_name) { | |
637b9140 MW |
297 | if ((func = PyCFunction_NewEx((/*unconst*/ PyMethodDef *)mm, |
298 | 0, mod)) == 0 || | |
361fd0e6 MW |
299 | (meth = PyMethod_New(func, 0, exc)) == 0 || |
300 | PyDict_SetItemString(dict, mm->ml_name, meth)) | |
301 | goto fail; | |
302 | Py_DECREF(func); func = 0; | |
303 | Py_DECREF(meth); meth = 0; | |
304 | mm++; | |
305 | } | |
306 | } | |
307 | ||
cfb291f0 MW |
308 | if ((nameobj = TEXT_FORMAT("%s.%s", PyModule_GetName(mod), name)) == 0 || |
309 | (exc = PyErr_NewException(TEXT_STR(nameobj), base, dict)) == 0) | |
361fd0e6 MW |
310 | goto fail; |
311 | ||
312 | done: | |
313 | Py_XDECREF(nameobj); | |
314 | Py_XDECREF(dict); | |
315 | return (exc); | |
316 | ||
317 | fail: | |
318 | Py_XDECREF(exc); | |
319 | Py_XDECREF(func); | |
320 | Py_XDECREF(meth); | |
321 | exc = 0; | |
322 | goto done; | |
323 | } | |
324 | ||
325 | void setconstants(PyObject *mod, const struct nameval *c) | |
326 | { | |
327 | PyObject *x; | |
328 | unsigned long u; | |
329 | ||
330 | while (c->name) { | |
331 | u = c->value; | |
332 | if (u <= LONG_MAX) x = PyInt_FromLong(u); | |
333 | else if (c->f&CF_SIGNED) x = PyInt_FromLong(-1 - (long)(ULONG_MAX - u)); | |
334 | else x = PyLong_FromUnsignedLong(u); | |
335 | PyModule_AddObject(mod, (/*unconst*/ char *)c->name, x); | |
336 | c++; | |
337 | } | |
338 | } | |
339 | ||
340 | /*----- Submodules --------------------------------------------------------*/ | |
341 | ||
342 | static PyMethodDef *global_methods; | |
343 | static size_t nmethods, methodsz; | |
344 | ||
345 | void addmethods(const PyMethodDef *m) | |
346 | { | |
347 | size_t n, want, newsz; | |
348 | ||
349 | for (n = 0; m[n].ml_name; n++); | |
350 | want = nmethods + n + 1; | |
351 | if (want > methodsz) { | |
352 | newsz = methodsz ? 2*methodsz : 16; | |
353 | while (want > newsz) newsz *= 2; | |
354 | if (!global_methods) | |
355 | global_methods = PyObject_Malloc(newsz*sizeof(PyMethodDef)); | |
356 | else | |
357 | global_methods = PyObject_Realloc(global_methods, | |
358 | newsz*sizeof(PyMethodDef)); | |
359 | assert(global_methods); | |
360 | methodsz = newsz; | |
361 | } | |
362 | memcpy(global_methods + nmethods, m, n*sizeof(PyMethodDef)); | |
363 | nmethods += n; | |
364 | global_methods[nmethods].ml_name = 0; | |
365 | } | |
366 | ||
367 | PyMethodDef *donemethods(void) { return (global_methods); } | |
368 | ||
369 | /*----- Low-level Python interface ----------------------------------------*/ | |
370 | ||
371 | static PyObject *meth__set_home_module(PyObject *me, PyObject *arg) | |
372 | { | |
373 | PyObject *mod; | |
374 | ||
375 | if (!PyArg_ParseTuple(arg, "O!:_set_home_module", &PyModule_Type, &mod)) | |
376 | return (0); | |
377 | Py_XDECREF(home_module); home_module = mod; Py_INCREF(home_module); | |
378 | RETURN_NONE; | |
379 | } | |
380 | ||
381 | static const PyMethodDef methods[] = { | |
382 | #define METHNAME(func) meth_##func | |
383 | METH (_set_home_module, "_set_home_module(MOD)") | |
384 | #undef METHNAME | |
385 | { 0 } | |
386 | }; | |
387 | ||
388 | void pyke_core_pyinit(void) { addmethods(methods); } | |
389 | void pyke_core_pyinsert(PyObject *mod) { ; } | |
390 | ||
391 | /*----- That's all, folks -------------------------------------------------*/ |