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10e6f88a 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 | { | |
10e6f88a MW |
49 | unsigned long *p = pp; |
50 | PyObject *t; | |
51 | ||
52 | if (!o) VALERR("can't delete"); | |
f7623015 | 53 | #ifdef PY2 |
10e6f88a | 54 | if (PyInt_Check(o)) { |
6286102d | 55 | long i = PyInt_AS_LONG(o); |
10e6f88a MW |
56 | if (i < 0) VALERR("must be nonnegative"); |
57 | *p = i; | |
6286102d | 58 | } else |
f7623015 | 59 | #endif |
6286102d | 60 | { |
10e6f88a MW |
61 | if ((t = PyNumber_Long(o)) == 0) goto end; |
62 | *p = PyLong_AsUnsignedLong(t); | |
63 | Py_DECREF(t); | |
64 | if (PyErr_Occurred()) goto end; | |
65 | } | |
66 | return (1); | |
67 | end: | |
68 | return (0); | |
69 | } | |
70 | ||
71 | int convuint(PyObject *o, void *pp) | |
72 | { | |
73 | unsigned long u; | |
74 | unsigned *p = pp; | |
75 | ||
76 | if (!convulong(o, &u)) goto end; | |
77 | if (u > UINT_MAX) VALERR("out of range"); | |
78 | *p = u; | |
79 | return (1); | |
80 | end: | |
81 | return (0); | |
82 | } | |
83 | ||
84 | int convszt(PyObject *o, void *pp) | |
85 | { | |
86 | unsigned long u; | |
87 | size_t *p = pp; | |
88 | ||
89 | if (!convulong(o, &u)) goto end; | |
90 | if (u > ~(size_t)0) VALERR("out of range"); | |
91 | *p = u; | |
92 | return (1); | |
93 | end: | |
94 | return (0); | |
95 | } | |
96 | ||
97 | int convbool(PyObject *o, void *pp) | |
98 | { | |
99 | if (!o) VALERR("can't delete"); | |
100 | *(int *)pp = PyObject_IsTrue(o); | |
101 | return (1); | |
102 | end: | |
103 | return (0); | |
104 | } | |
105 | ||
67c75893 MW |
106 | int convbin(PyObject *o, void *pp) |
107 | { | |
108 | struct bin *r = pp; | |
21684137 | 109 | int rc; |
67c75893 | 110 | |
2135a6d3 | 111 | if (BIN_CHECK(o)) { |
21684137 | 112 | r->vw.obj = 0; |
2135a6d3 MW |
113 | r->p = BIN_PTR(o); |
114 | r->sz = BIN_LEN(o); | |
67c75893 MW |
115 | return (1); |
116 | } | |
f7623015 | 117 | #ifdef PY2 |
67c75893 MW |
118 | if (PyUnicode_Check(o)) { |
119 | o = _PyUnicode_AsDefaultEncodedString(o, 0); | |
120 | if (!o) return (0); | |
21684137 | 121 | r->vw.obj = 0; |
67c75893 MW |
122 | r->p = PyString_AS_STRING(o); |
123 | r->sz = PyString_GET_SIZE(o); | |
124 | return (1); | |
125 | } | |
f7623015 | 126 | #endif |
21684137 MW |
127 | #if PY_VERSION_HEX < 0x02060000 |
128 | r->vw.buf = 0; | |
67c75893 | 129 | return (PyObject_AsReadBuffer(o, &r->p, &r->sz) ? 0 : 1); |
21684137 MW |
130 | #else |
131 | rc = PyObject_GetBuffer(o, &r->vw, PyBUF_SIMPLE); if (rc) return (0); | |
132 | o->p = o->vw.buf; o->sz = o->vw.len; | |
133 | return (1); | |
134 | #endif | |
67c75893 MW |
135 | } |
136 | ||
21684137 MW |
137 | void freebin(struct bin *r) |
138 | { if (r->vw.obj) PyBuffer_Release(&r->vw); } | |
139 | ||
10e6f88a MW |
140 | /*----- Miscellaneous utilities -------------------------------------------*/ |
141 | ||
142 | PyObject *abstract_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw) | |
143 | { | |
144 | PyErr_SetString(PyExc_TypeError, "can't instantiate this class"); | |
145 | return (0); | |
146 | } | |
147 | ||
77535854 MW |
148 | PyObject *enrich_compare(int op, int cmp) |
149 | { | |
150 | int r = -1; | |
151 | ||
152 | switch (op) { | |
153 | case Py_LT: r = cmp < 0; break; | |
154 | case Py_LE: r = cmp <= 0; break; | |
155 | case Py_EQ: r = cmp == 0; break; | |
156 | case Py_NE: r = cmp != 0; break; | |
157 | case Py_GE: r = cmp >= 0; break; | |
158 | case Py_GT: r = cmp > 0; break; | |
159 | default: assert(0); | |
160 | } | |
161 | return (getbool(r)); | |
162 | } | |
163 | ||
10e6f88a MW |
164 | /*----- Saving and restoring exceptions ----------------------------------*/ |
165 | ||
166 | void report_lost_exception_v(struct excinfo *exc, | |
167 | const char *why, va_list ap) | |
168 | { | |
169 | PyObject *hookfn = 0; | |
170 | PyObject *whyobj = 0; | |
171 | PyObject *obj = 0; | |
172 | ||
173 | /* Make sure we start out without a pending exception, or this will get | |
174 | * really confusing. | |
175 | */ | |
176 | assert(!PyErr_Occurred()); | |
177 | ||
178 | /* Format the explanation. */ | |
2135a6d3 | 179 | if (why) whyobj = TEXT_VFORMAT(why, ap); |
10e6f88a MW |
180 | else { whyobj = Py_None; Py_INCREF(whyobj); } |
181 | ||
182 | /* Find our home module's `lostexchook' function. This won't work if | |
183 | * there's no module, or the function isn't defined, or it's `None'. | |
184 | */ | |
185 | if (!home_module) goto sys; | |
186 | hookfn = PyObject_GetAttrString(home_module, "lostexchook"); | |
187 | if (hookfn == Py_None) goto sys; | |
188 | else if (hookfn) ; | |
189 | else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto ouch; | |
190 | else { PyErr_Clear(); goto sys; } | |
191 | ||
192 | /* Call the hook function. */ | |
193 | obj = PyObject_CallFunction(hookfn, "(OOOO)", | |
194 | whyobj, exc->ty, exc->val, exc->tb); | |
195 | if (!obj) goto ouch; | |
196 | goto end; | |
197 | ||
198 | /* Something went wrong reporting the problem. */ | |
199 | ouch: | |
200 | PySys_WriteStderr("\n!!! FAILURE REPORTING LOST EXCEPTION\n"); | |
201 | PyErr_Print(); | |
202 | /* drop through... */ | |
203 | ||
204 | /* There was no hook, so try to do something sensible using | |
205 | * `sys.excepthook'. | |
206 | */ | |
207 | sys: | |
2135a6d3 | 208 | PySys_WriteStderr("\n!!! LOST EXCEPTION: %s\n", TEXT_PTR(whyobj)); |
10e6f88a MW |
209 | RESTORE_EXCINFO(exc); |
210 | PyErr_Print(); | |
211 | /* drop through... */ | |
212 | ||
213 | /* Clean up afterwards. */ | |
214 | end: | |
215 | Py_XDECREF(hookfn); | |
216 | Py_XDECREF(whyobj); | |
217 | Py_XDECREF(obj); | |
218 | } | |
219 | ||
220 | void report_lost_exception(struct excinfo *exc, const char *why, ...) | |
221 | { | |
222 | va_list ap; | |
223 | ||
224 | va_start(ap, why); | |
225 | report_lost_exception_v(exc, why, ap); | |
226 | va_end(ap); | |
227 | } | |
228 | ||
229 | void stash_exception(struct excinfo *exc, const char *why, ...) | |
230 | { | |
231 | va_list ap; | |
232 | struct excinfo stash; | |
233 | ||
234 | if (!exc->ty) | |
235 | STASH_EXCINFO(exc); | |
236 | else { | |
237 | va_start(ap, why); | |
238 | STASH_EXCINFO(&stash); | |
239 | report_lost_exception_v(&stash, why, ap); | |
240 | va_end(ap); | |
241 | } | |
242 | } | |
243 | ||
244 | void restore_exception(struct excinfo *exc, const char *why, ...) | |
245 | { | |
246 | va_list ap; | |
247 | struct excinfo stash; | |
248 | ||
249 | if (!PyErr_Occurred()) | |
250 | RESTORE_EXCINFO(exc); | |
251 | else { | |
252 | va_start(ap, why); | |
253 | STASH_EXCINFO(&stash); | |
254 | report_lost_exception_v(exc, why, ap); | |
255 | RESTORE_EXCINFO(&stash); | |
256 | va_end(ap); | |
257 | } | |
258 | } | |
259 | ||
260 | /*----- Type definitions --------------------------------------------------*/ | |
261 | ||
262 | static const PyTypeObject emptytype = { 0 }; | |
263 | ||
264 | void *newtype(PyTypeObject *metaty, | |
265 | const PyTypeObject *skel, | |
266 | const char *name) | |
267 | { | |
268 | PyHeapTypeObject *ty = | |
269 | (PyHeapTypeObject *)_PyObject_GC_Malloc(_PyObject_VAR_SIZE(metaty, 0)); | |
270 | if (!skel) skel = &emptytype; | |
271 | memcpy(ty, skel, sizeof(*skel)); | |
10e6f88a MW |
272 | #define COPY(blah) do { \ |
273 | if (ty->ht_type.tp_as_##blah) { \ | |
274 | memcpy(&ty->as_##blah, \ | |
275 | ty->ht_type.tp_as_##blah, \ | |
276 | sizeof(ty->as_##blah)); \ | |
277 | ty->ht_type.tp_as_##blah = &ty->as_##blah; \ | |
278 | } \ | |
279 | } while (0) | |
280 | COPY(number); | |
281 | COPY(sequence); | |
282 | COPY(mapping); | |
283 | COPY(buffer); | |
284 | #undef COPY | |
285 | if (name) | |
2135a6d3 | 286 | ty->ht_name = TEXT_FROMSTR(name); |
10e6f88a | 287 | else if (ty->ht_type.tp_name) |
2135a6d3 MW |
288 | ty->ht_name = TEXT_FROMSTR(ty->ht_type.tp_name); |
289 | else | |
290 | ty->ht_name = 0; | |
10e6f88a | 291 | if (ty->ht_name) |
2135a6d3 | 292 | ty->ht_type.tp_name = TEXT_STR(ty->ht_name); |
91ce675a | 293 | ty->ht_slots = 0; |
f7623015 MW |
294 | #ifdef PY3 |
295 | ty->ht_qualname = 0; | |
296 | #endif | |
10e6f88a MW |
297 | (void)PyObject_INIT(&ty->ht_type, metaty); |
298 | Py_INCREF(metaty); | |
299 | return (ty); | |
300 | } | |
301 | ||
302 | void typeready(PyTypeObject *ty) | |
303 | { | |
f7623015 MW |
304 | #ifdef PY3 |
305 | PyHeapTypeObject *hty = (PyHeapTypeObject *)ty; | |
306 | hty->ht_qualname = hty->ht_name; | |
307 | #endif | |
10e6f88a MW |
308 | PyType_Ready(ty); |
309 | PyDict_SetItemString(ty->tp_dict, "__module__", modname); | |
310 | } | |
311 | ||
c263b05c MW |
312 | PyTypeObject *inittype(const PyTypeObject *tyskel, |
313 | PyTypeObject *base, PyTypeObject *meta) | |
10e6f88a MW |
314 | { |
315 | PyTypeObject *ty = newtype(meta, tyskel, 0); | |
c263b05c | 316 | if (base) { ty->tp_base = base; Py_INCREF(base); } |
10e6f88a MW |
317 | ty->tp_flags |= Py_TPFLAGS_HEAPTYPE; |
318 | typeready(ty); | |
319 | return (ty); | |
320 | } | |
321 | ||
322 | /*----- Populating modules ------------------------------------------------*/ | |
323 | ||
324 | PyObject *mkexc(PyObject *mod, PyObject *base, | |
c90f712e | 325 | const char *name, const PyMethodDef *mm) |
10e6f88a MW |
326 | { |
327 | PyObject *nameobj = 0; | |
328 | PyObject *dict = 0; | |
329 | PyObject *exc = 0; | |
330 | PyObject *func = 0; | |
331 | PyObject *meth = 0; | |
332 | ||
333 | if ((dict = PyDict_New()) == 0) goto fail; | |
334 | ||
335 | if (mm) { | |
336 | while (mm->ml_name) { | |
c90f712e MW |
337 | if ((func = PyCFunction_NewEx((/*unconst*/ PyMethodDef *)mm, |
338 | 0, mod)) == 0 || | |
f7623015 MW |
339 | (meth = PY23(PyMethod_New(func, 0, exc), |
340 | PyInstanceMethod_New(func))) == 0 || | |
10e6f88a MW |
341 | PyDict_SetItemString(dict, mm->ml_name, meth)) |
342 | goto fail; | |
343 | Py_DECREF(func); func = 0; | |
344 | Py_DECREF(meth); meth = 0; | |
345 | mm++; | |
346 | } | |
347 | } | |
348 | ||
2135a6d3 MW |
349 | if ((nameobj = TEXT_FORMAT("%s.%s", PyModule_GetName(mod), name)) == 0 || |
350 | (exc = PyErr_NewException(TEXT_STR(nameobj), base, dict)) == 0) | |
10e6f88a MW |
351 | goto fail; |
352 | ||
353 | done: | |
354 | Py_XDECREF(nameobj); | |
355 | Py_XDECREF(dict); | |
356 | return (exc); | |
357 | ||
358 | fail: | |
359 | Py_XDECREF(exc); | |
360 | Py_XDECREF(func); | |
361 | Py_XDECREF(meth); | |
362 | exc = 0; | |
363 | goto done; | |
364 | } | |
365 | ||
366 | void setconstants(PyObject *mod, const struct nameval *c) | |
367 | { | |
368 | PyObject *x; | |
369 | unsigned long u; | |
370 | ||
371 | while (c->name) { | |
372 | u = c->value; | |
373 | if (u <= LONG_MAX) x = PyInt_FromLong(u); | |
374 | else if (c->f&CF_SIGNED) x = PyInt_FromLong(-1 - (long)(ULONG_MAX - u)); | |
375 | else x = PyLong_FromUnsignedLong(u); | |
376 | PyModule_AddObject(mod, (/*unconst*/ char *)c->name, x); | |
377 | c++; | |
378 | } | |
379 | } | |
380 | ||
381 | /*----- Submodules --------------------------------------------------------*/ | |
382 | ||
383 | static PyMethodDef *global_methods; | |
384 | static size_t nmethods, methodsz; | |
385 | ||
386 | void addmethods(const PyMethodDef *m) | |
387 | { | |
388 | size_t n, want, newsz; | |
389 | ||
390 | for (n = 0; m[n].ml_name; n++); | |
391 | want = nmethods + n + 1; | |
392 | if (want > methodsz) { | |
393 | newsz = methodsz ? 2*methodsz : 16; | |
394 | while (want > newsz) newsz *= 2; | |
395 | if (!global_methods) | |
396 | global_methods = PyObject_Malloc(newsz*sizeof(PyMethodDef)); | |
397 | else | |
398 | global_methods = PyObject_Realloc(global_methods, | |
399 | newsz*sizeof(PyMethodDef)); | |
400 | assert(global_methods); | |
401 | methodsz = newsz; | |
402 | } | |
403 | memcpy(global_methods + nmethods, m, n*sizeof(PyMethodDef)); | |
404 | nmethods += n; | |
405 | global_methods[nmethods].ml_name = 0; | |
406 | } | |
407 | ||
408 | PyMethodDef *donemethods(void) { return (global_methods); } | |
409 | ||
410 | /*----- Low-level Python interface ----------------------------------------*/ | |
411 | ||
412 | static PyObject *meth__set_home_module(PyObject *me, PyObject *arg) | |
413 | { | |
414 | PyObject *mod; | |
415 | ||
416 | if (!PyArg_ParseTuple(arg, "O!:_set_home_module", &PyModule_Type, &mod)) | |
417 | return (0); | |
418 | Py_XDECREF(home_module); home_module = mod; Py_INCREF(home_module); | |
419 | RETURN_NONE; | |
420 | } | |
421 | ||
422 | static const PyMethodDef methods[] = { | |
423 | #define METHNAME(func) meth_##func | |
424 | METH (_set_home_module, "_set_home_module(MOD)") | |
425 | #undef METHNAME | |
426 | { 0 } | |
427 | }; | |
428 | ||
429 | void pyke_core_pyinit(void) { addmethods(methods); } | |
430 | void pyke_core_pyinsert(PyObject *mod) { ; } | |
431 | ||
432 | /*----- That's all, folks -------------------------------------------------*/ |