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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 | ;;; | |
10 | ;;; This file is part of the Sensble Object Design, an object system for C. | |
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) | |
34 | "Attach a slot function to the *class-slot-alist*. | |
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 | ||
52 | The slot will be caled NAME, and will be of TYPE (which should be a type | |
53 | S-expression). The slot's (static) initializer will be constructed by | |
54 | printing the value of INIT, which is evaluated with CLASS bound to the | |
55 | class object being constructed. If any PREPARE forms are provided, then | |
56 | they are evaluated as a progn; they are evaluated with CLASS bound to the | |
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) | |
64 | (make-property-set :lisp-class 'sod-class-slot | |
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 | ||
98 | ~:{sod__obj.~A.~A._vt = &~A;~:^~% ~} | |
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) | |
108 | (vtable-name class head)))) | |
109 | (ilayout-ichains ilayout))))) | |
110 | ||
111 | (define-class-slot "init" (class stream) | |
112 | (* (fun (* void) ("/*p*/" (* void)))) | |
113 | (format nil "~A__init" class) | |
114 | ||
115 | ;; FIXME this needs a metaobject protocol | |
116 | (let ((ilayout (sod-class-ilayout class))) | |
117 | (format stream "~&~: | |
118 | static void *~A__init(void *p) | |
119 | { | |
120 | struct ~A *sod__obj = ~0@*~A__imprint(p);~2%" | |
121 | class | |
122 | (ilayout-struct-tag class)) | |
123 | (dolist (ichain (ilayout-ichains ilayout)) | |
124 | (let ((ich (format nil "sod__obj.~A.~A" | |
125 | (sod-class-nickname (ichain-head ichain)) | |
126 | (sod-class-nickname (ichain-tail ichain))))) | |
127 | (dolist (item (ichain-body ichain)) | |
128 | (etypecase item | |
129 | (vtable-pointer | |
130 | nil) | |
131 | (islots | |
132 | (let ((isl (format nil "~A.~A" | |
133 | ich | |
134 | (sod-class-nickname (islots-class item))))) | |
135 | (dolist (slot (islots-slots item)) | |
136 | (let ((dslot (effective-slot-direct-slot slot)) | |
137 | (init (effective-slot-initializer slot))) | |
138 | (when init | |
139 | (format stream " ~A.~A =" isl | |
140 | (sod-slot-name dslot)) | |
141 | (ecase (sod-initializer-value-kind init) | |
142 | (:simple (write (sod-initializer-value-form init) | |
143 | :stream stream | |
144 | :pretty nil :escape nil) | |
145 | (format stream ";~%")) | |
146 | (:compound (format stream " (~A) {" | |
147 | (sod-slot-type dslot)) | |
148 | (write (sod-initializer-value-form init) | |
149 | :stream stream | |
150 | :pretty nil :escape nil) | |
151 | (format stream "};~%")))))))))))) | |
152 | (format stream "~&~: | |
153 | return (p); | |
154 | }~2%"))) | |
155 | ||
156 | ;;;-------------------------------------------------------------------------- | |
157 | ;;; Superclass structure. | |
158 | ||
159 | (define-class-slot "n_supers" (class) size-t | |
160 | (length (sod-class-direct-superclasses class))) | |
161 | ||
162 | (define-class-slot "supers" (class stream) | |
163 | (* (* (class "SodClass" :const) :const)) | |
164 | (if (null (sod-class-direct-superclasses class)) 0 | |
165 | (format nil "~A__supers" class)) | |
166 | (let ((supers (sod-class-direct-superclasses class))) | |
167 | (when supers | |
168 | (format stream "~&~: | |
169 | /* Direct superclasses. */ | |
170 | static const SodClass *const ~A__supers[] = { | |
171 | ~{~A__class~^,~% ~} | |
172 | };~2%" | |
173 | class supers)))) | |
174 | ||
175 | (define-class-slot "n_cpl" (class) size-t | |
176 | (length (sod-class-precedence-list class))) | |
177 | ||
178 | (define-class-slot "cpl" (class stream) | |
179 | (* (* (class "SodClass" :const) :const)) | |
180 | (format nil "~A__cpl" class) | |
181 | (format stream "~&~: | |
182 | /* Class precedence list. */ | |
183 | static const SodClass *const ~A__cpl[] = { | |
184 | ~{~A__class~^,~% ~} | |
185 | };~2%" | |
186 | class (sod-class-precedence-list class))) | |
187 | ||
188 | ;;;-------------------------------------------------------------------------- | |
189 | ;;; Chain structure. | |
190 | ||
191 | (define-class-slot "link" (class) (* (class "SodClass" :const)) | |
192 | (aif (sod-class-chain-link class) | |
193 | (format nil "~A__class" it) | |
194 | 0)) | |
195 | ||
196 | (define-class-slot "head" (class) (* (class "SodClass" :const)) | |
197 | (format nil "~A__class" (sod-class-chain-head class))) | |
198 | ||
199 | (define-class-slot "level" (class) size-t | |
200 | (position class (reverse (sod-class-chain class)))) | |
201 | ||
202 | (define-class-slot "n_chains" (class) size-t | |
203 | (length (sod-class-chains class))) | |
204 | ||
205 | (define-class-slot "chains" (class stream) (* (struct "sod_chain" :const)) | |
206 | (format nil "~A__chains" class) | |
207 | (let ((chains (sod-class-chains class))) | |
208 | (format stream "~&~: | |
209 | /* Chain structure. */ | |
210 | ~1@*~:{static const SodClass *const ~A__chain_~A[] = { | |
211 | ~{~A__class~^,~% ~} | |
212 | };~:^~2%~} | |
213 | ||
214 | ~0@*static const struct sod_chain ~A__chains[] = { | |
215 | ~:{ { ~3@*~A, | |
216 | ~0@*&~A__chain_~A, | |
217 | ~4@*offsetof(struct ~A, ~A), | |
218 | (const struct sod_vtable *)&~A, | |
219 | sizeof(struct ~A) }~:^,~%~} | |
220 | };~2%" | |
221 | class ;0 | |
222 | (mapcar (lambda (chain) ;1 | |
223 | (let* ((head (sod-class-chain-head (car chain))) | |
224 | (chain-nick (sod-class-nickname head))) | |
225 | (list class chain-nick ;0 1 | |
226 | (reverse chain) ;2 | |
227 | (length chain) ;3 | |
228 | (ilayout-struct-tag class) chain-nick ;4 5 | |
229 | (vtable-name class head) ;6 | |
230 | (ichain-struct-tag class head)))) ;7 | |
231 | chains)))) | |
232 | ||
233 | ;;;-------------------------------------------------------------------------- | |
234 | ;;; Class-specific layout. | |
235 | ||
236 | (define-class-slot "off_islots" (class) size-t | |
237 | (format nil "offsetof(struct ~A, ~A)" | |
238 | (ichain-struct-tag class (sod-class-chain-head class)) | |
239 | (sod-class-nickname class))) | |
240 | ||
241 | (define-class-slot "islotsz" (class) size-t | |
242 | (format nil "sizeof(struct ~A)" | |
243 | (islots-struct-tag class))) | |
244 | ||
245 | ;;;-------------------------------------------------------------------------- | |
246 | ;;; Bootstrapping the class graph. | |
247 | ||
248 | (defun bootstrap-classes (module) | |
249 | (let* ((sod-object (make-sod-class "SodObject" nil | |
250 | (make-property-set :nick 'obj))) | |
251 | (sod-class (make-sod-class "SodClass" (list sod-object) | |
252 | (make-property-set :nick 'cls))) | |
253 | (classes (list sod-object sod-class))) | |
254 | ||
255 | ;; Sort out the recursion. | |
256 | (setf (slot-value sod-class 'chain-link) sod-object) | |
257 | (dolist (class classes) | |
258 | (setf (slot-value class 'metaclass) sod-class)) | |
259 | ||
260 | ;; Predeclare the class types. | |
261 | (dolist (class classes) | |
262 | (make-class-type (sod-class-name class))) | |
263 | ||
264 | ;; Attach the class slots. | |
265 | (dolist (slot *class-slot-alist*) | |
266 | (funcall (cdr slot) sod-class)) | |
267 | ||
268 | ;; These classes are too closely intertwined. We must partially finalize | |
269 | ;; them together by hand. This is cloned from `finalize-sod-class'. | |
270 | (dolist (class classes) | |
271 | (with-slots (class-precedence-list chain-head chain chains) class | |
272 | (setf class-precedence-list (compute-cpl class)) | |
273 | (setf (values chain-head chain chains) (compute-chains class)))) | |
274 | ||
275 | ;; Done. | |
276 | (dolist (class classes) | |
277 | (finalize-sod-class class) | |
278 | (add-to-module module class)))) | |
279 | ||
280 | (defun make-builtin-module () | |
281 | (let ((module (make-instance 'module | |
282 | :name (make-pathname :name "SOD-BASE" | |
283 | :type "SOD" | |
284 | :case :common) | |
285 | :state nil)) | |
286 | (include (format nil "#include \"~A\"~%" | |
287 | (make-pathname :name "SOD" :type "H" | |
288 | :case :common)))) | |
289 | (call-with-module-environment | |
290 | (lambda () | |
291 | (dolist (name '("va_list" "size_t" "ptrdiff_t")) | |
292 | (add-to-module module (make-instance 'type-item :name name))) | |
293 | (add-to-module module (make-instance 'code-fragment-item | |
294 | :reason :c | |
295 | :constraints nil | |
296 | :name :includes | |
297 | :fragment include)) | |
298 | (bootstrap-classes module))) | |
299 | module)) | |
300 | ||
301 | (defvar *builtin-module* nil) | |
302 | ||
303 | (define-clear-the-decks reset-builtin-module | |
304 | (setf *builtin-module* (make-builtin-module))) | |
305 | ||
306 | ;;;----- That's all, folks -------------------------------------------------- |