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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Builtin module provides the root of the class graph | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
e0808c47 | 10 | ;;; This file is part of the Sensible Object Design, an object system for C. |
dea4d055 MW |
11 | ;;; |
12 | ;;; SOD is free software; you can redistribute it and/or modify | |
13 | ;;; it under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 2 of the License, or | |
15 | ;;; (at your option) any later version. | |
16 | ;;; | |
17 | ;;; SOD is distributed in the hope that it will be useful, | |
18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with SOD; if not, write to the Free Software Foundation, | |
24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | (cl:in-package #:sod) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Infrastructure. | |
30 | ||
31 | (defvar *class-slot-alist* nil) | |
32 | ||
33 | (defun add-class-slot-function (name function) | |
ea578bb4 | 34 | "Attach a slot function to the `*class-slot-alist*'. |
dea4d055 MW |
35 | |
36 | The FUNCTION is invoked with one argument, which is a `sod-class' object | |
37 | to which it should add a slot. If a function with the same NAME is | |
38 | already defined then that function is replaced; otherwise a new name/ | |
39 | function pair is defined. | |
40 | ||
41 | Functions are are invoked in the order in which their names were first | |
42 | added." | |
43 | ||
44 | (aif (assoc name *class-slot-alist* :test #'string=) | |
45 | (setf (cdr it) function) | |
46 | (asetf *class-slot-alist* (append it (list (cons name function)))))) | |
47 | ||
48 | (defmacro define-class-slot | |
49 | (name (class &optional stream) type init &body prepare) | |
50 | "Define a new class slot. | |
51 | ||
ea578bb4 MW |
52 | The slot will be called NAME (a string) and will be of TYPE (which should |
53 | be a type S-expression). The slot's (static) initializer will be | |
54 | constructed by printing the value of INIT, which is evaluated with CLASS | |
55 | bound to the class object being constructed. If any PREPARE forms are | |
56 | provided, then they are evaluated as a progn, with CLASS bound to the | |
dea4d055 MW |
57 | class object, and STREAM bound to the output stream it should write on." |
58 | ||
59 | (with-gensyms (classvar) | |
60 | `(add-class-slot-function | |
61 | ',name | |
62 | (lambda (,classvar) | |
63 | (make-sod-slot ,classvar ,name (c-type ,type) | |
52a79ab8 | 64 | (make-property-set :slot-class 'sod-class-slot |
dea4d055 MW |
65 | :initializer-function |
66 | (lambda (,class) | |
67 | ,init) | |
68 | ,@(and prepare | |
69 | `(:prepare-function | |
70 | (lambda (,class ,stream) | |
71 | ,@prepare))))))))) | |
72 | ||
73 | ;;;-------------------------------------------------------------------------- | |
74 | ;;; Basic information. | |
75 | ||
76 | (define-class-slot "name" (class) const-string | |
77 | (prin1-to-string (sod-class-name class))) | |
78 | ||
79 | (define-class-slot "nick" (class) const-string | |
80 | (prin1-to-string (sod-class-nickname class))) | |
81 | ||
82 | ;;;-------------------------------------------------------------------------- | |
83 | ;;; Instance allocation and initialization. | |
84 | ||
85 | (define-class-slot "initsz" (class) size-t | |
86 | (format nil "sizeof(struct ~A)" (ilayout-struct-tag class))) | |
87 | ||
88 | (define-class-slot "imprint" (class stream) | |
89 | (* (fun (* void) ("/*p*/" (* void)))) | |
90 | (format nil "~A__imprint" class) | |
91 | (let ((ilayout (sod-class-ilayout class))) | |
92 | (format stream "~&~: | |
93 | /* Imprint raw memory with instance structure. */ | |
94 | static void *~A__imprint(void *p) | |
95 | { | |
96 | struct ~A *sod__obj = p; | |
97 | ||
c2438e62 | 98 | ~:{sod__obj->~A.~A._vt = &~A.~A;~:^~% ~} |
dea4d055 MW |
99 | return (p); |
100 | }~2%" | |
101 | class | |
102 | (ilayout-struct-tag class) | |
103 | (mapcar (lambda (ichain) | |
104 | (let* ((head (ichain-head ichain)) | |
105 | (tail (ichain-tail ichain))) | |
106 | (list (sod-class-nickname head) | |
107 | (sod-class-nickname tail) | |
c2438e62 MW |
108 | (vtable-name class head) |
109 | (sod-class-nickname tail)))) | |
dea4d055 MW |
110 | (ilayout-ichains ilayout))))) |
111 | ||
112 | (define-class-slot "init" (class stream) | |
113 | (* (fun (* void) ("/*p*/" (* void)))) | |
114 | (format nil "~A__init" class) | |
115 | ||
116 | ;; FIXME this needs a metaobject protocol | |
ea578bb4 MW |
117 | (let ((ilayout (sod-class-ilayout class)) |
118 | (used nil)) | |
dea4d055 | 119 | (format stream "~&~: |
ea578bb4 MW |
120 | /* Provide initial values for an instance's slots. */ |
121 | static void *~A__init(void *p)~%{~%" class) | |
dea4d055 | 122 | (dolist (ichain (ilayout-ichains ilayout)) |
ea578bb4 | 123 | (let ((ich (format nil "sod__obj->~A.~A" |
dea4d055 MW |
124 | (sod-class-nickname (ichain-head ichain)) |
125 | (sod-class-nickname (ichain-tail ichain))))) | |
126 | (dolist (item (ichain-body ichain)) | |
127 | (etypecase item | |
128 | (vtable-pointer | |
129 | nil) | |
130 | (islots | |
131 | (let ((isl (format nil "~A.~A" | |
132 | ich | |
133 | (sod-class-nickname (islots-class item))))) | |
134 | (dolist (slot (islots-slots item)) | |
135 | (let ((dslot (effective-slot-direct-slot slot)) | |
136 | (init (effective-slot-initializer slot))) | |
137 | (when init | |
ea578bb4 MW |
138 | (unless used |
139 | (format stream | |
9ec578d9 MW |
140 | " struct ~A *sod__obj = ~A__imprint(p);~2%" |
141 | (ilayout-struct-tag class) class) | |
ea578bb4 | 142 | (setf used t)) |
1d8206e9 MW |
143 | (format stream " {~% ~A ~A =" |
144 | (sod-slot-type dslot) | |
145 | *sod-tmp-val*) | |
dea4d055 MW |
146 | (ecase (sod-initializer-value-kind init) |
147 | (:simple (write (sod-initializer-value-form init) | |
148 | :stream stream | |
149 | :pretty nil :escape nil) | |
150 | (format stream ";~%")) | |
1d8206e9 | 151 | (:compound (format stream " {") |
dea4d055 MW |
152 | (write (sod-initializer-value-form init) |
153 | :stream stream | |
154 | :pretty nil :escape nil) | |
1d8206e9 MW |
155 | (format stream " };~%"))) |
156 | (format stream " ~A.~A = ~A;~% }~%" | |
157 | isl (sod-slot-name dslot) | |
158 | *sod-tmp-val*)))))))))) | |
ea578bb4 MW |
159 | (unless used |
160 | (format stream " ~A__imprint(p);~%" class)) | |
dea4d055 MW |
161 | (format stream "~&~: |
162 | return (p); | |
163 | }~2%"))) | |
164 | ||
165 | ;;;-------------------------------------------------------------------------- | |
166 | ;;; Superclass structure. | |
167 | ||
168 | (define-class-slot "n_supers" (class) size-t | |
169 | (length (sod-class-direct-superclasses class))) | |
170 | ||
171 | (define-class-slot "supers" (class stream) | |
172 | (* (* (class "SodClass" :const) :const)) | |
173 | (if (null (sod-class-direct-superclasses class)) 0 | |
174 | (format nil "~A__supers" class)) | |
175 | (let ((supers (sod-class-direct-superclasses class))) | |
176 | (when supers | |
177 | (format stream "~&~: | |
178 | /* Direct superclasses. */ | |
179 | static const SodClass *const ~A__supers[] = { | |
180 | ~{~A__class~^,~% ~} | |
181 | };~2%" | |
182 | class supers)))) | |
183 | ||
184 | (define-class-slot "n_cpl" (class) size-t | |
185 | (length (sod-class-precedence-list class))) | |
186 | ||
187 | (define-class-slot "cpl" (class stream) | |
188 | (* (* (class "SodClass" :const) :const)) | |
189 | (format nil "~A__cpl" class) | |
190 | (format stream "~&~: | |
191 | /* Class precedence list. */ | |
192 | static const SodClass *const ~A__cpl[] = { | |
193 | ~{~A__class~^,~% ~} | |
194 | };~2%" | |
195 | class (sod-class-precedence-list class))) | |
196 | ||
197 | ;;;-------------------------------------------------------------------------- | |
198 | ;;; Chain structure. | |
199 | ||
200 | (define-class-slot "link" (class) (* (class "SodClass" :const)) | |
201 | (aif (sod-class-chain-link class) | |
202 | (format nil "~A__class" it) | |
203 | 0)) | |
204 | ||
205 | (define-class-slot "head" (class) (* (class "SodClass" :const)) | |
206 | (format nil "~A__class" (sod-class-chain-head class))) | |
207 | ||
208 | (define-class-slot "level" (class) size-t | |
209 | (position class (reverse (sod-class-chain class)))) | |
210 | ||
211 | (define-class-slot "n_chains" (class) size-t | |
212 | (length (sod-class-chains class))) | |
213 | ||
214 | (define-class-slot "chains" (class stream) (* (struct "sod_chain" :const)) | |
215 | (format nil "~A__chains" class) | |
216 | (let ((chains (sod-class-chains class))) | |
217 | (format stream "~&~: | |
218 | /* Chain structure. */ | |
219 | ~1@*~:{static const SodClass *const ~A__chain_~A[] = { | |
220 | ~{~A__class~^,~% ~} | |
221 | };~:^~2%~} | |
222 | ||
223 | ~0@*static const struct sod_chain ~A__chains[] = { | |
9ec578d9 MW |
224 | ~:{ { ~ |
225 | /* n_classes = */ ~3@*~A, | |
226 | /* classes = */ ~0@*~A__chain_~A, | |
227 | /* off_ichain = */ ~4@*offsetof(struct ~A, ~A), | |
228 | /* vt = */ (const struct sod_vtable *)&~A, | |
229 | /* ichainsz = */ sizeof(struct ~A) }~:^,~%~} | |
dea4d055 MW |
230 | };~2%" |
231 | class ;0 | |
232 | (mapcar (lambda (chain) ;1 | |
233 | (let* ((head (sod-class-chain-head (car chain))) | |
234 | (chain-nick (sod-class-nickname head))) | |
9ec578d9 MW |
235 | (list class chain-nick ;0 1 |
236 | (reverse chain) ;2 | |
237 | (length chain) ;3 | |
238 | (ilayout-struct-tag class) chain-nick ;4 5 | |
239 | (vtable-name class head) ;6 | |
240 | (ichain-struct-tag (car chain) head)))) ;7 | |
dea4d055 MW |
241 | chains)))) |
242 | ||
243 | ;;;-------------------------------------------------------------------------- | |
244 | ;;; Class-specific layout. | |
245 | ||
246 | (define-class-slot "off_islots" (class) size-t | |
9ec578d9 MW |
247 | (if (sod-class-slots class) |
248 | (format nil "offsetof(struct ~A, ~A)" | |
249 | (ichain-struct-tag class (sod-class-chain-head class)) | |
250 | (sod-class-nickname class)) | |
251 | "0")) | |
dea4d055 MW |
252 | |
253 | (define-class-slot "islotsz" (class) size-t | |
9ec578d9 MW |
254 | (if (sod-class-slots class) |
255 | (format nil "sizeof(struct ~A)" | |
256 | (islots-struct-tag class)) | |
257 | "0")) | |
dea4d055 MW |
258 | |
259 | ;;;-------------------------------------------------------------------------- | |
260 | ;;; Bootstrapping the class graph. | |
261 | ||
262 | (defun bootstrap-classes (module) | |
ea578bb4 MW |
263 | "Bootstrap the braid in MODULE. |
264 | ||
265 | This builds the fundamental recursive braid, where `SodObject' is an | |
266 | instance of `SodClass', and `SodClass' is a subclass of `SodObject' (and | |
267 | an instance of itself)." | |
dea4d055 MW |
268 | (let* ((sod-object (make-sod-class "SodObject" nil |
269 | (make-property-set :nick 'obj))) | |
270 | (sod-class (make-sod-class "SodClass" (list sod-object) | |
271 | (make-property-set :nick 'cls))) | |
272 | (classes (list sod-object sod-class))) | |
273 | ||
274 | ;; Sort out the recursion. | |
275 | (setf (slot-value sod-class 'chain-link) sod-object) | |
276 | (dolist (class classes) | |
277 | (setf (slot-value class 'metaclass) sod-class)) | |
278 | ||
279 | ;; Predeclare the class types. | |
280 | (dolist (class classes) | |
281 | (make-class-type (sod-class-name class))) | |
282 | ||
283 | ;; Attach the class slots. | |
284 | (dolist (slot *class-slot-alist*) | |
285 | (funcall (cdr slot) sod-class)) | |
286 | ||
287 | ;; These classes are too closely intertwined. We must partially finalize | |
288 | ;; them together by hand. This is cloned from `finalize-sod-class'. | |
289 | (dolist (class classes) | |
290 | (with-slots (class-precedence-list chain-head chain chains) class | |
291 | (setf class-precedence-list (compute-cpl class)) | |
292 | (setf (values chain-head chain chains) (compute-chains class)))) | |
293 | ||
294 | ;; Done. | |
295 | (dolist (class classes) | |
296 | (finalize-sod-class class) | |
297 | (add-to-module module class)))) | |
298 | ||
73c17a81 | 299 | (export '*builtin-module*) |
ea578bb4 MW |
300 | (defvar *builtin-module* nil |
301 | "The builtin module.") | |
302 | ||
73c17a81 | 303 | (export 'make-builtin-module) |
dea4d055 | 304 | (defun make-builtin-module () |
ea578bb4 MW |
305 | "Construct the builtin module. |
306 | ||
9ec578d9 MW |
307 | This involves constructing the braid (which is done in |
308 | `bootstrap-classes') and defining a few obvious type names which users | |
309 | will find handy. | |
ea578bb4 MW |
310 | |
311 | Returns the newly constructed module, and stores it in the variable | |
312 | `*builtin-module*'." | |
dea4d055 MW |
313 | (let ((module (make-instance 'module |
314 | :name (make-pathname :name "SOD-BASE" | |
315 | :type "SOD" | |
316 | :case :common) | |
ea578bb4 | 317 | :state nil))) |
9ec578d9 | 318 | (with-module-environment (module) |
0e7cdea0 | 319 | (dolist (name '("va_list" "size_t" "ptrdiff_t" "wchar_t")) |
9ec578d9 MW |
320 | (add-to-module module (make-instance 'type-item :name name))) |
321 | (flet ((header-name (name) | |
322 | (concatenate 'string "\"" (string-downcase name) ".h\"")) | |
323 | (add-includes (reason &rest names) | |
324 | (let ((text (with-output-to-string (out) | |
325 | (dolist (name names) | |
326 | (format out "#include ~A~%" name))))) | |
327 | (add-to-module module | |
328 | (make-instance 'code-fragment-item | |
329 | :reason reason | |
330 | :constraints nil | |
331 | :name :includes | |
332 | :fragment text))))) | |
333 | (add-includes :c (header-name "sod")) | |
334 | (add-includes :h "<stddef.h>")) | |
335 | (bootstrap-classes module)) | |
ea578bb4 | 336 | (setf *builtin-module* module))) |
dea4d055 | 337 | |
54c01772 MW |
338 | (define-clear-the-decks builtin-module |
339 | (unless *builtin-module* (make-builtin-module))) | |
340 | ||
dea4d055 | 341 | ;;;----- That's all, folks -------------------------------------------------- |