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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 | #ifndef PYKE_H | |
28 | #define PYKE_H | |
29 | ||
30 | #ifdef __cplusplus | |
31 | extern "C" { | |
32 | #endif | |
33 | ||
34 | /*----- Header files ------------------------------------------------------*/ | |
35 | ||
36 | #define PY_SSIZE_T_CLEAN | |
37 | ||
38 | #include <Python.h> | |
39 | #include <structmember.h> | |
40 | ||
41 | /*----- Other preliminaries -----------------------------------------------*/ | |
42 | ||
43 | #define NOTHING | |
44 | #define COMMA , | |
45 | ||
46 | /*----- Symbol visibility -------------------------------------------------* | |
47 | * | |
48 | * This library is very messy regarding symbol namespace. Keep this mess | |
49 | * within our shared-object. | |
50 | */ | |
51 | ||
52 | #define GOBBLE_SEMI extern int notexist | |
53 | #if defined(__GNUC__) && defined(__ELF__) | |
54 | # define PRIVATE_SYMBOLS _Pragma("GCC visibility push(hidden)") GOBBLE_SEMI | |
55 | # define PUBLIC_SYMBOLS _Pragma("GCC visibility pop") GOBBLE_SEMI | |
56 | # define EXPORT __attribute__((__visibility__("default"))) | |
57 | #else | |
58 | # define PRIVATE_SYMBOLS GOBBLE_SEMI | |
59 | # define PUBLIC_SYMBOLS GOBBLE_SEMI | |
60 | # define EXPORT | |
61 | #endif | |
62 | ||
63 | PRIVATE_SYMBOLS; | |
64 | ||
65 | /*----- Utilities for returning values and exceptions ---------------------*/ | |
66 | ||
67 | /* Returning values. */ | |
68 | #define RETURN_OBJ(obj) do { Py_INCREF(obj); return (obj); } while (0) | |
69 | #define RETURN_NONE RETURN_OBJ(Py_None) | |
70 | #define RETURN_NOTIMPL RETURN_OBJ(Py_NotImplemented) | |
71 | #define RETURN_TRUE RETURN_OBJ(Py_True) | |
72 | #define RETURN_FALSE RETURN_OBJ(Py_False) | |
73 | #define RETURN_ME RETURN_OBJ(me) | |
74 | ||
75 | /* Returning exceptions. (Note that `KeyError' is `MAPERR' here, because | |
76 | * Catacomb has its own kind of `KeyError'.) | |
77 | */ | |
78 | #define EXCERR(exc, str) do { \ | |
79 | PyErr_SetString(exc, str); \ | |
80 | goto end; \ | |
81 | } while (0) | |
82 | #define VALERR(str) EXCERR(PyExc_ValueError, str) | |
83 | #define OVFERR(str) EXCERR(PyExc_OverflowError, str) | |
84 | #define TYERR(str) EXCERR(PyExc_TypeError, str) | |
85 | #define IXERR(str) EXCERR(PyExc_IndexError, str) | |
86 | #define ZDIVERR(str) EXCERR(PyExc_ZeroDivisionError, str) | |
87 | #define SYSERR(str) EXCERR(PyExc_SystemError, str) | |
88 | #define NIERR(str) EXCERR(PyExc_NotImplementedError, str) | |
89 | #define INDEXERR(idx) do { \ | |
90 | PyErr_SetObject(PyExc_KeyError, idx); \ | |
91 | goto end; \ | |
92 | } while (0) | |
93 | #define OSERR(name) do { \ | |
94 | PyErr_SetFromErrnoWithFilename(PyExc_OSError, name); \ | |
95 | goto end; \ | |
96 | } while (0) | |
97 | ||
98 | /* Saving and restoring exceptions. */ | |
99 | struct excinfo { PyObject *ty, *val, *tb; }; | |
100 | #define EXCINFO_INIT { 0, 0, 0 } | |
101 | #define INIT_EXCINFO(exc) do { \ | |
102 | struct excinfo *_exc = (exc); _exc->ty = _exc->val = _exc->tb = 0; \ | |
103 | } while (0) | |
104 | #define RELEASE_EXCINFO(exc) do { \ | |
105 | struct excinfo *_exc = (exc); \ | |
106 | Py_XDECREF(_exc->ty); _exc->ty = 0; \ | |
107 | Py_XDECREF(_exc->val); _exc->val = 0; \ | |
108 | Py_XDECREF(_exc->tb); _exc->tb = 0; \ | |
109 | } while (0) | |
110 | #define STASH_EXCINFO(exc) do { \ | |
111 | struct excinfo *_exc = (exc); \ | |
112 | PyErr_Fetch(&_exc->ty, &_exc->val, &_exc->tb); \ | |
113 | PyErr_NormalizeException(&_exc->ty, &_exc->val, &_exc->tb); \ | |
114 | } while (0) | |
115 | #define RESTORE_EXCINFO(exc) do { \ | |
116 | struct excinfo *_exc = (exc); \ | |
117 | PyErr_Restore(_exc->ty, _exc->val, _exc->tb); \ | |
118 | _exc->ty = _exc->val = _exc->tb = 0; \ | |
119 | } while (0) | |
120 | extern void report_lost_exception(struct excinfo *, const char *, ...); | |
121 | extern void report_lost_exception_v(struct excinfo *, const char *, va_list); | |
122 | extern void stash_exception(struct excinfo *, const char *, ...); | |
123 | extern void restore_exception(struct excinfo *, const char *, ...); | |
124 | ||
125 | /*----- Conversions -------------------------------------------------------*/ | |
126 | ||
127 | /* Define an input conversion (`O&') function: check that the object has | |
128 | * Python type TY, and extract a C pointer to CTY by calling EXT on the | |
129 | * object (which may well be a macro). | |
130 | */ | |
131 | #define CONVFUNC(ty, cty, ext) \ | |
132 | int conv##ty(PyObject *o, void *p) \ | |
133 | { \ | |
134 | if (!PyObject_TypeCheck(o, ty##_pytype)) \ | |
135 | TYERR("wanted a " #ty); \ | |
136 | *(cty *)p = ext(o); \ | |
137 | return (1); \ | |
138 | end: \ | |
139 | return (0); \ | |
140 | } | |
141 | ||
142 | /* Input conversion functions for standard kinds of objects, with overflow | |
143 | * checking where applicable. | |
144 | */ | |
145 | extern int convulong(PyObject *, void *); /* unsigned long */ | |
146 | extern int convuint(PyObject *, void *); /* unsigned int */ | |
147 | extern int convszt(PyObject *, void *); /* size_t */ | |
148 | extern int convbool(PyObject *, void *); /* bool */ | |
149 | ||
150 | /* Output conversions. */ | |
151 | extern PyObject *getbool(int); /* bool */ | |
152 | extern PyObject *getulong(unsigned long); /* any kind of unsigned integer */ | |
153 | ||
154 | /*----- Miscellaneous utilities -------------------------------------------*/ | |
155 | ||
156 | #define FREEOBJ(obj) \ | |
157 | (((PyObject *)(obj))->ob_type->tp_free((PyObject *)(obj))) | |
158 | /* Actually free OBJ, e.g., in a deallocation function. */ | |
159 | ||
160 | extern PyObject *abstract_pynew(PyTypeObject *, PyObject *, PyObject *); | |
161 | /* A `tp_new' function which refuses to make the object. */ | |
162 | ||
163 | #define KWLIST (/*unconst*/ char **)kwlist | |
164 | /* Strip `const' qualifiers from the keyword list `kwlist'. Useful when | |
165 | * calling `PyArg_ParseTupleAndKeywords', which isn't `const'-correct. | |
166 | */ | |
167 | ||
168 | /*----- Type definitions --------------------------------------------------* | |
169 | * | |
170 | * Pyke types are defined in a rather unusual way. | |
171 | * | |
172 | * The main code defines a `type skeleton' of type `PyTypeObject', | |
173 | * conventionally named `TY_pytype_skel'. Unlike typical Python type | |
174 | * definitions in extensions, this can (and should) be read-only. Also, | |
175 | * there's no point in setting the `tp_base' pointer here, because the actual | |
176 | * runtime base type object won't, in general, be known at compile time. | |
177 | * Instead, the type skeletons are converted into Python `heap types' by the | |
178 | * `INITTYPE' macro. The main difference is that Python code can add | |
179 | * attributes to heap types, and we make extensive use of this ability. | |
180 | */ | |
181 | ||
182 | extern void *newtype(PyTypeObject */*meta*/, | |
183 | const PyTypeObject */*skel*/, const char */*name*/); | |
184 | /* Make and return a new Python type object, of type META (typically | |
185 | * `PyType_Type', but may be a subclass), filled in from the skeleton SKEL | |
186 | * (null to inherit everything), and named NAME. The caller can mess with | |
187 | * the type object further at this time: call `typeready' when it's set up | |
188 | * properly. | |
189 | */ | |
190 | ||
191 | extern void typeready(PyTypeObject *); | |
192 | /* The type object is now ready to be used. */ | |
193 | ||
194 | extern PyTypeObject *inittype(PyTypeObject */*skel*/, | |
195 | PyTypeObject */*meta*/); | |
196 | /* All-in-one function to construct a working type from a type skeleton | |
197 | * SKEL, with metaclass META. The caller is expected to have filled in the | |
198 | * direct superclass in SKEL->tp_base. | |
199 | */ | |
200 | ||
201 | /* Alias for built-in types, to fit in with Pyke naming conventions. */ | |
202 | #define root_pytype 0 | |
203 | #define type_pytype &PyType_Type | |
204 | ||
205 | #define INITTYPE_META(ty, base, meta) do { \ | |
206 | ty##_pytype_skel.tp_base = base##_pytype; \ | |
207 | ty##_pytype = inittype(&ty##_pytype_skel, meta##_pytype); \ | |
208 | } while (0) | |
209 | #define INITTYPE(ty, base) INITTYPE_META(ty, base, type) | |
210 | /* Macros to initialize a type from its skeleton. */ | |
211 | ||
212 | /* Convenience wrappers for filling in `PyMethodDef' tables, following | |
213 | * Pyke naming convention. Define `METHNAME' locally as | |
214 | * | |
215 | * #define METHNAME(name) foometh_##func | |
216 | * | |
217 | * around the method table. | |
218 | */ | |
219 | #define METH(func, doc) \ | |
220 | { #func, METHNAME(func), METH_VARARGS, doc }, | |
221 | #define KWMETH(func, doc) \ | |
222 | { #func, (PyCFunction)METHNAME(func), \ | |
223 | METH_VARARGS | METH_KEYWORDS, doc }, | |
224 | ||
225 | /* Convenience wrappers for filling in `PyGetSetDef' tables, following Pyke | |
226 | * naming convention. Define `GETSETNAME' locally as | |
227 | * | |
228 | * #define GETSETNAME(op, name) foo##op##_##func | |
229 | * | |
230 | * around the get/set table. | |
231 | */ | |
232 | #define GET(func, doc) \ | |
233 | { #func, GETSETNAME(get, func), 0, doc }, | |
234 | #define GETSET(func, doc) \ | |
235 | { #func, GETSETNAME(get, func), GETSETNAME(set, func), doc }, | |
236 | ||
237 | /* Convenience wrapper for filling in `PyMemberDef' tables. Define | |
238 | * `MEMBERSTRUCT' locally as | |
239 | * | |
240 | * #define MEMBERSTRUCT foo_pyobj | |
241 | * | |
242 | * around the member table. | |
243 | */ | |
244 | #define MEMBER(name, ty, f, doc) \ | |
245 | { #name, ty, offsetof(MEMBERSTRUCT, name), f, doc }, | |
246 | ||
247 | /*----- Populating modules ------------------------------------------------*/ | |
248 | ||
249 | extern PyObject *modname; | |
250 | /* The overall module name. Set this with `PyString_FromString'. */ | |
251 | ||
252 | extern PyObject *home_module; | |
253 | /* The overall module object. */ | |
254 | ||
255 | extern PyObject *mkexc(PyObject */*mod*/, PyObject */*base*/, | |
256 | const char */*name*/, PyMethodDef */*methods*/); | |
257 | /* Make and return an exception class called NAME, which will end up in | |
258 | * module MOD (though it is not added at this time). The new class is a | |
259 | * subclass of BASE. Attach the METHODS to it. | |
260 | */ | |
261 | ||
262 | #define INSERT(name, ob) do { \ | |
263 | PyObject *_o = (PyObject *)(ob); \ | |
264 | Py_INCREF(_o); \ | |
265 | PyModule_AddObject(mod, name, _o); \ | |
266 | } while (0) | |
267 | /* Insert a Python object OB into the module `mod' under the given NAME. */ | |
268 | ||
269 | /* Numeric constants. */ | |
270 | struct nameval { const char *name; unsigned f; unsigned long value; }; | |
271 | #define CF_SIGNED 1u | |
272 | extern void setconstants(PyObject *, const struct nameval *); | |
273 | ||
274 | #define INSEXC(name, var, base, meth) \ | |
275 | INSERT(name, var = mkexc(mod, base, name, meth)) | |
276 | /* Insert an exception class into the module `mod'; other arguments are as | |
277 | * for `mkexc'. | |
278 | */ | |
279 | ||
280 | /*----- Submodules --------------------------------------------------------* | |
281 | * | |
282 | * It's useful to split the Python module up into multiple source files, and | |
283 | * have each one contribute its definitions into the main module. | |
284 | * | |
285 | * Define a list-macro `MODULES' in the master header file naming the | |
286 | * submodules to be processed, and run | |
287 | * | |
288 | * MODULES(DECLARE_MODINIT) | |
289 | * | |
290 | * to declare the interface functions. | |
291 | * | |
292 | * Each submodule FOO defines two functions: `FOO_pyinit' initializes types | |
293 | * (see `INITTYPE' above) and accumulates methods (`addmethods' below), while | |
294 | * `FOO_pyinsert' populates the module with additional definitions | |
295 | * (especially types, though also constants). | |
296 | * | |
297 | * The top-level module initialization should call `INIT_MODULES' before | |
298 | * creating the Python module, and `INSERT_MODULES' afterwards to make | |
299 | * everything work. | |
300 | */ | |
301 | ||
302 | extern void addmethods(const PyMethodDef *); | |
303 | extern PyMethodDef *donemethods(void); | |
304 | /* Accumulate method-table fragments, and return the combined table of all | |
305 | * of the fragments. | |
306 | */ | |
307 | ||
308 | #define DECLARE_MODINIT(m) \ | |
309 | extern void m##_pyinit(void); \ | |
310 | extern void m##_pyinsert(PyObject *); | |
311 | /* Declare submodule interface functions. */ | |
312 | ||
313 | #define DOMODINIT(m) m##_pyinit(); | |
314 | #define DOMODINSERT(m) m##_pyinsert(mod); | |
315 | #define INIT_MODULES do { MODULES(DOMODINIT) } while (0) | |
316 | #define INSERT_MODULES do { MODULES(DOMODINSERT) } while (0) | |
317 | /* Top-level dispatch to the various submodules. */ | |
318 | ||
319 | /*----- Generic mapping support -------------------------------------------*/ | |
320 | ||
321 | /* Mapping methods. */ | |
322 | #define GMAP_METH(func, doc) { #func, gmapmeth_##func, METH_VARARGS, doc }, | |
323 | #define GMAP_KWMETH(func, doc) \ | |
324 | { #func, (PyCFunction)gmapmeth_##func, METH_VARARGS|METH_KEYWORDS, doc }, | |
325 | #define GMAP_METHDECL(func, doc) \ | |
326 | extern PyObject *gmapmeth_##func(PyObject *, PyObject *); | |
327 | #define GMAP_KWMETHDECL(func, doc) \ | |
328 | extern PyObject *gmapmeth_##func(PyObject *, PyObject *, PyObject *); | |
329 | ||
330 | #define GMAP_DOROMETHODS(METH, KWMETH) \ | |
331 | METH (has_key, "D.has_key(KEY) -> BOOL") \ | |
332 | METH (keys, "D.keys() -> LIST") \ | |
333 | METH (values, "D.values() -> LIST") \ | |
334 | METH (items, "D.items() -> LIST") \ | |
335 | METH (iterkeys, "D.iterkeys() -> ITER") \ | |
336 | METH (itervalues, "D.itervalues() -> ITER") \ | |
337 | METH (iteritems, "D.iteritems() -> ITER") \ | |
338 | KWMETH(get, "D.get(KEY, [default = None]) -> VALUE") | |
339 | ||
340 | #define GMAP_DOMETHODS(METH, KWMETH) \ | |
341 | GMAP_DOROMETHODS(METH, KWMETH) \ | |
342 | METH (clear, "D.clear()") \ | |
343 | KWMETH(setdefault, "D.setdefault(K, [default = None]) -> VALUE") \ | |
344 | KWMETH(pop, "D.pop(KEY, [default = <error>]) -> VALUE") \ | |
345 | METH (popitem, "D.popitem() -> (KEY, VALUE)") \ | |
346 | METH (update, "D.update(MAP)") | |
347 | ||
348 | GMAP_DOMETHODS(GMAP_METHDECL, GMAP_KWMETHDECL) | |
349 | #define GMAP_ROMETHODS GMAP_DOROMETHODS(GMAP_METH, GMAP_KWMETH) | |
350 | #define GMAP_METHODS GMAP_DOMETHODS(GMAP_METH, GMAP_KWMETH) | |
351 | ||
352 | /* Mapping protocol implementation. */ | |
353 | extern Py_ssize_t gmap_pysize(PyObject *); /* for `mp_length' */ | |
354 | extern PySequenceMethods gmap_pysequence; /* for `tp_as_sequence' */ | |
355 | extern PyMethodDef gmap_pymethods[]; /* all the standard methods */ | |
356 | ||
357 | /*----- That's all, folks -------------------------------------------------*/ | |
358 | ||
359 | #ifdef __cplusplus | |
360 | } | |
361 | #endif | |
362 | ||
363 | #endif |