[sod] / class-output.lisp

;;; -*-lisp-*-
;;;
;;; Output functions for classes
;;;
;;; (c) 2009 Straylight/Edgeware
;;;

;;;----- Licensing notice ---------------------------------------------------
;;;
;;; This file is part of the Simple Object Definition system.
;;;
;;; SOD is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; SOD is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with SOD; if not, write to the Free Software Foundation,
;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

(cl:in-package #:sod)

;;;--------------------------------------------------------------------------
;;; Utility macro.

(defmacro sequence-output
    ((streamvar sequencer) &body clauses)
  (let ((seqvar (gensym "SEQ")))
    (labels ((convert-item-name (name)
	       (if (listp name)
		   (cons 'list name)
		   name))
	     (convert-constraint (constraint)
	       (cons 'list (mapcar #'convert-item-name constraint)))
	     (process-body (clauses)
	       (if (eq (car clauses) :constraint)
		   (cons `(add-sequencer-constraint
			   ,seqvar
			   ,(convert-constraint (cadr clauses)))
			 (process-body (cddr clauses)))
		   (mapcar (lambda (clause)
			     (let ((name (car clause))
				   (body (cdr clause)))
			       `(add-sequencer-item-function
				 ,seqvar
				 ,(convert-item-name name)
				 (lambda (,streamvar)
				   ,@body))))
			   clauses))))
      `(let ((,seqvar ,sequencer))
	 ,@(process-body clauses)))))

;;;--------------------------------------------------------------------------
;;; Classes.

(defmethod add-output-hooks progn
    ((class sod-class) (reason (eql :h)) sequencer)

  ;; Main output sequencing.
  (sequence-output (stream sequencer)

    :constraint
    (:typedefs)

    :constraint
    ((:classes :start)
     (class :banner)
     (class :islots :start) (class :islots :slots) (class :islots :end)
     (class :vtmsgs :start) (class :vtmsgs :end)
     (class :vtables :start) (class :vtables :end)
     (class :vtable-externs) (class :vtable-externs-after)
     (class :direct-methods)
     (class :ichains :start) (class :ichains :end)
     (class :ilayout :start) (class :ilayout :slots) (class :ilayout :end)
     (class :conversions)
     (:classes :end))

    (:typedefs
     (format stream "typedef struct ~A ~A;~%"
	     (ichain-struct-tag class (sod-class-chain-head class)) class))

    ((class :banner)
     (banner (format nil "Class ~A" class) stream))
    ((class :vtable-externs-after)
     (terpri stream)))

  ;; Maybe generate an islots structure.
  (when (sod-class-slots class)
    (dolist (slot (sod-class-slots class))
      (add-output-hooks slot 'populate-islots sequencer))
    (sequence-output (stream sequencer)
      ((class :islots :start)
       (format stream "struct ~A {~%" (islots-struct-tag class)))
      ((class :islots :end)
       (format stream "};~2%"))))

  ;; Declare the direct methods.
  (when (sod-class-methods class)
    (dolist (method (sod-class-methods class))
      (add-output-hooks method :declare-direct-methods sequencer))
    (sequence-output (stream sequencer)
      ((class :direct-methods)
       (terpri stream))))

  ;; Provide upcast macros which do the right thing.
  (when (sod-class-direct-superclasses class)
    (sequence-output (stream sequencer)
      ((class :conversions)
       (let ((chain-head (sod-class-chain-head class)))
	 (dolist (super (cdr (sod-class-precedence-list class)))
	   (let ((super-head (sod-class-chain-head super)))
	     (format stream (concatenate 'string "#define "
					 "~:@(~A__CONV_~A~)(p) ((~A *)"
					 "~:[SOD_XCHAIN(~A, p)~;p~])~%")
		     class (sod-class-nickname super) super
		     (eq chain-head super-head)
		     (sod-class-nickname super-head))))))))

  ;; Generate vtmsgs structure for all superclasses.
  (add-output-hooks (car (sod-class-vtables class))
		    'populate-vtmsgs
		    sequencer))

(defmethod add-output-hooks progn ((class sod-class) reason sequencer)
  (with-slots (ilayout vtables) class
    (add-output-hooks ilayout reason sequencer)
    (dolist (vtable vtables) (add-output-hooks vtable reason sequencer))))

;;;--------------------------------------------------------------------------
;;; Instance structure.

(defmethod add-output-hooks progn
    ((slot sod-slot) (reason (eql 'populate-islots)) sequencer)
  (sequence-output (stream sequencer)
    (((sod-slot-class slot) :islots :slots)
     (pprint-logical-block (stream nil :prefix "  " :suffix ";")
       (pprint-c-type (sod-slot-type slot) stream (sod-slot-name slot)))
     (terpri stream))))

(defmethod add-output-hooks progn ((ilayout ilayout) reason sequencer)
  (with-slots (ichains) ilayout
    (dolist (ichain ichains) (add-output-hooks ichain reason sequencer))))

(defmethod add-output-hooks progn
    ((ilayout ilayout) (reason (eql :h)) sequencer)
  (with-slots (class ichains) ilayout
    (sequence-output (stream sequencer)
      ((class :ilayout :start)
       (format stream "struct ~A {~%" (ilayout-struct-tag class)))
      ((class :ilayout :end)
       (format stream "};~2%")))
    (dolist (ichain ichains)
      (add-output-hooks ichain 'populate-ilayout sequencer))))

(defmethod add-output-hooks progn
    ((ichain ichain) (reason (eql :h)) sequencer)
  (with-slots (class chain-head) ichain
    (sequence-output (stream sequencer)
      :constraint ((class :ichains :start)
		   (class :ichain chain-head :start)
		   (class :ichain chain-head :slots)
		   (class :ichain chain-head :end)
		   (class :ichains :end))
      ((class :ichain chain-head :start)
       (format stream "struct ~A {~%" (ichain-struct-tag class chain-head)))
      ((class :ichain chain-head :end)
       (format stream "};~2%")))))

(defmethod add-output-hooks progn
    ((ichain ichain) (reason (eql 'populate-ilayout)) sequencer)
  (with-slots (class chain-head) ichain
    (sequence-output (stream sequencer)
      ((class :ilayout :slots)
       (format stream "  struct ~A ~A;~%"
	       (ichain-struct-tag class chain-head)
	       (sod-class-nickname chain-head))))))

(defmethod add-output-hooks progn ((ichain ichain) reason sequencer)
  (with-slots (body) ichain
    (dolist (item body) (add-output-hooks item reason sequencer))))

(defmethod add-output-hooks progn
    ((vtptr vtable-pointer) (reason (eql :h)) sequencer)
  (with-slots (class chain-head) vtptr
    (sequence-output (stream sequencer)
      ((class :ichain chain-head :slots)
       (format stream "  const struct ~A *_vt;~%"
	       (vtable-struct-tag class chain-head))))))

(defmethod add-output-hooks progn
    ((islots islots) (reason (eql :h)) sequencer)
  (with-slots (class subclass slots) islots
    (sequence-output (stream sequencer)
      ((subclass :ichain (sod-class-chain-head class) :slots)
       (format stream "  struct ~A ~A;~%"
	       (islots-struct-tag class)
	       (sod-class-nickname class))))))

;;;--------------------------------------------------------------------------
;;; Vtable structure.

(defmethod add-output-hooks progn ((vtable vtable) reason sequencer)
  (with-slots (body) vtable
    (dolist (item body) (add-output-hooks item reason sequencer))))

(defmethod add-output-hooks progn
    ((vtable vtable) (reason (eql :h)) sequencer)
  (with-slots (class chain-head) vtable
    (sequence-output (stream sequencer)
      :constraint ((class :vtables :start)
		   (class :vtable chain-head :start)
		   (class :vtable chain-head :slots)
		   (class :vtable chain-head :end)
		   (class :vtables :end))
      ((class :vtable chain-head :start)
       (format stream "struct ~A {~%" (vtable-struct-tag class chain-head)))
      ((class :vtable chain-head :end)
       (format stream "};~2%"))
      ((class :vtable-externs)
       (format stream "~@<extern struct ~A ~2I~_~A__vtable_~A;~:>~%"
	       (vtable-struct-tag class chain-head)
	       class (sod-class-nickname chain-head))))))

(defmethod add-output-hooks progn
    ((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
  (with-slots (class subclass chain-head) vtmsgs
    (sequence-output (stream sequencer)
      ((subclass :vtable chain-head :slots)
       (format stream "  struct ~A ~A;~%"
	       (vtmsgs-struct-tag subclass class)
	       (sod-class-nickname class))))))

(defmethod add-output-hooks progn
    ((vtmsgs vtmsgs) (reason (eql 'populate-vtmsgs)) sequencer)
  (when (vtmsgs-entries vtmsgs)
    (with-slots (class subclass) vtmsgs
      (sequence-output (stream sequencer)
	:constraint ((subclass :vtmsgs :start)
		     (subclass :vtmsgs class :start)
		     (subclass :vtmsgs class :slots)
		     (subclass :vtmsgs class :end)
		     (subclass :vtmsgs :end))
	((subclass :vtmsgs class :start)
	 (format stream "struct ~A {~%" (vtmsgs-struct-tag subclass class)))
	((subclass :vtmsgs class :end)
	 (format stream "};~2%"))))))

(defmethod add-output-hooks progn ((vtmsgs vtmsgs) reason sequencer)
  (with-slots (entries) vtmsgs
    (dolist (entry entries) (add-output-hooks entry reason sequencer))))

(defmethod add-output-hooks progn ((entry method-entry) reason sequencer)
  (with-slots (method) entry
    (add-output-hooks method reason sequencer)))

(defmethod add-output-hooks progn
    ((method effective-method) (reason (eql 'populate-vtmsgs)) sequencer)
  (let* ((message (effective-method-message method))
	 (class (effective-method-class method))
	 (class-type (find-class-type (sod-class-name class)))
	 (raw-type (sod-message-type message))
	 (type (c-type (* (fun (lisp (c-type-subtype raw-type))
			       ("/*me*/" (* (lisp class-type)))
			       . (commentify-argument-names
				  (c-function-arguments raw-type)))))))
    (sequence-output (stream sequencer)
      ((class :vtmsgs (sod-message-class message) :slots)
       (pprint-logical-block (stream nil :prefix "  " :suffix ";")
	 (pprint-c-type type stream (sod-message-name message)))
       (terpri stream)))))

(defmethod add-output-hooks progn
    ((cptr class-pointer) (reason (eql :h)) sequencer)
  (with-slots (class chain-head metaclass meta-chain-head) cptr
    (sequence-output (stream sequencer)
      ((class :vtable chain-head :slots)
       (format stream "  const ~A *~:[_class~;~:*_cls_~A~];~%"
	       metaclass
	       (if (sod-class-direct-superclasses meta-chain-head)
		   (sod-class-nickname meta-chain-head)
		   nil))))))

(defmethod add-output-hooks progn
    ((boff base-offset) (reason (eql :h)) sequencer)
  (with-slots (class chain-head) boff
    (sequence-output (stream sequencer)
      ((class :vtable chain-head :slots)
       (write-line "  size_t _base;" stream)))))

(defmethod add-output-hooks progn
    ((choff chain-offset) (reason (eql :h)) sequencer)
  (with-slots (class chain-head target-head) choff
    (sequence-output (stream sequencer)
      ((class :vtable chain-head :slots)
       (format stream "  ptrdiff_t _off_~A;~%"
	       (sod-class-nickname target-head))))))

;;;--------------------------------------------------------------------------
;;; Testing.

#+test
(defun test (name)
  (let ((sequencer (make-instance 'sequencer))
	(class (find-sod-class name)))
    (add-output-hooks class :h sequencer)
    (invoke-sequencer-items sequencer *standard-output*)
    sequencer))

;;;----- That's all, folks --------------------------------------------------
Commit	Line	Data
1f1d88f5 MW	1	;;; --lisp--
	2	;;;
	3	;;; Output functions for classes
	4	;;;
	5	;;; (c) 2009 Straylight/Edgeware
	6	;;;
	7
	8	;;;----- Licensing notice ---------------------------------------------------
	9	;;;
	10	;;; This file is part of the Simple Object Definition system.
	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	;;; Utility macro.
	30
	31	(defmacro sequence-output
	32	((streamvar sequencer) &body clauses)
	33	(let ((seqvar (gensym "SEQ")))
	34	(labels ((convert-item-name (name)
	35	(if (listp name)
	36	(cons 'list name)
	37	name))
	38	(convert-constraint (constraint)
	39	(cons 'list (mapcar #'convert-item-name constraint)))
	40	(process-body (clauses)
	41	(if (eq (car clauses) :constraint)
	42	(cons `(add-sequencer-constraint
	43	,seqvar
	44	,(convert-constraint (cadr clauses)))
	45	(process-body (cddr clauses)))
	46	(mapcar (lambda (clause)
	47	(let ((name (car clause))
	48	(body (cdr clause)))
	49	`(add-sequencer-item-function
	50	,seqvar
	51	,(convert-item-name name)
	52	(lambda (,streamvar)
	53	,@body))))
	54	clauses))))
	55	`(let ((,seqvar ,sequencer))
	56	,@(process-body clauses)))))
	57
	58	;;;--------------------------------------------------------------------------
	59	;;; Classes.
	60
	61	(defmethod add-output-hooks progn
	62	((class sod-class) (reason (eql :h)) sequencer)
	63
	64	;; Main output sequencing.
65	(sequence-output (stream sequencer)
66
67	:constraint
68	(:typedefs)
69
70	:constraint
71	((:classes :start)
72	(class :banner)
73	(class :islots :start) (class :islots :slots) (class :islots :end)
74	(class :vtmsgs :start) (class :vtmsgs :end)
75	(class :vtables :start) (class :vtables :end)
76	(class :vtable-externs) (class :vtable-externs-after)
77	(class :direct-methods)
78	(class :ichains :start) (class :ichains :end)
79	(class :ilayout :start) (class :ilayout :slots) (class :ilayout :end)
80	(class :conversions)
81	(:classes :end))
82
83	(:typedefs
84	(format stream "typedef struct ~A ~A;~%"
85	(ichain-struct-tag class (sod-class-chain-head class)) class))
86
87	((class :banner)
88	(banner (format nil "Class ~A" class) stream))
89	((class :vtable-externs-after)
90	(terpri stream)))
91
92	;; Maybe generate an islots structure.
93	(when (sod-class-slots class)
94	(dolist (slot (sod-class-slots class))
95	(add-output-hooks slot 'populate-islots sequencer))
96	(sequence-output (stream sequencer)
97	((class :islots :start)
98	(format stream "struct ~A {~%" (islots-struct-tag class)))
99	((class :islots :end)
100	(format stream "};~2%"))))
101
102	;; Declare the direct methods.
103	(when (sod-class-methods class)
104	(dolist (method (sod-class-methods class))
105	(add-output-hooks method :declare-direct-methods sequencer))
106	(sequence-output (stream sequencer)
107	((class :direct-methods)
108	(terpri stream))))
109
110	;; Provide upcast macros which do the right thing.
111	(when (sod-class-direct-superclasses class)
112	(sequence-output (stream sequencer)
113	((class :conversions)
114	(let ((chain-head (sod-class-chain-head class)))
115	(dolist (super (cdr (sod-class-precedence-list class)))
116	(let ((super-head (sod-class-chain-head super)))
117	(format stream (concatenate 'string "#define "
118	"~:@(~A__CONV_~A~)(p) ((~A *)"
119	"~:[SOD_XCHAIN(~A, p)~;p~])~%")
120	class (sod-class-nickname super) super
121	(eq chain-head super-head)
122	(sod-class-nickname super-head))))))))
123
124	;; Generate vtmsgs structure for all superclasses.
125	(add-output-hooks (car (sod-class-vtables class))
126	'populate-vtmsgs
127	sequencer))
128
129	(defmethod add-output-hooks progn ((class sod-class) reason sequencer)
130	(with-slots (ilayout vtables) class
131	(add-output-hooks ilayout reason sequencer)
132	(dolist (vtable vtables) (add-output-hooks vtable reason sequencer))))
133
134	;;;--------------------------------------------------------------------------
135	;;; Instance structure.
136
137	(defmethod add-output-hooks progn
138	((slot sod-slot) (reason (eql 'populate-islots)) sequencer)
139	(sequence-output (stream sequencer)
140	(((sod-slot-class slot) :islots :slots)
141	(pprint-logical-block (stream nil :prefix " " :suffix ";")
142	(pprint-c-type (sod-slot-type slot) stream (sod-slot-name slot)))
143	(terpri stream))))
144
145	(defmethod add-output-hooks progn ((ilayout ilayout) reason sequencer)
146	(with-slots (ichains) ilayout
147	(dolist (ichain ichains) (add-output-hooks ichain reason sequencer))))
148
149	(defmethod add-output-hooks progn
150	((ilayout ilayout) (reason (eql :h)) sequencer)
151	(with-slots (class ichains) ilayout
152	(sequence-output (stream sequencer)
153	((class :ilayout :start)
154	(format stream "struct ~A {~%" (ilayout-struct-tag class)))
155	((class :ilayout :end)
156	(format stream "};~2%")))
157	(dolist (ichain ichains)
158	(add-output-hooks ichain 'populate-ilayout sequencer))))
159
160	(defmethod add-output-hooks progn
161	((ichain ichain) (reason (eql :h)) sequencer)
162	(with-slots (class chain-head) ichain
163	(sequence-output (stream sequencer)
164	:constraint ((class :ichains :start)
165	(class :ichain chain-head :start)
166	(class :ichain chain-head :slots)
167	(class :ichain chain-head :end)
168	(class :ichains :end))
169	((class :ichain chain-head :start)
170	(format stream "struct ~A {~%" (ichain-struct-tag class chain-head)))
171	((class :ichain chain-head :end)
172	(format stream "};~2%")))))
173
174	(defmethod add-output-hooks progn
175	((ichain ichain) (reason (eql 'populate-ilayout)) sequencer)
176	(with-slots (class chain-head) ichain
177	(sequence-output (stream sequencer)
178	((class :ilayout :slots)
179	(format stream " struct ~A ~A;~%"
180	(ichain-struct-tag class chain-head)
181	(sod-class-nickname chain-head))))))
182
183	(defmethod add-output-hooks progn ((ichain ichain) reason sequencer)
184	(with-slots (body) ichain
185	(dolist (item body) (add-output-hooks item reason sequencer))))
186
187	(defmethod add-output-hooks progn
188	((vtptr vtable-pointer) (reason (eql :h)) sequencer)
189	(with-slots (class chain-head) vtptr
190	(sequence-output (stream sequencer)
191	((class :ichain chain-head :slots)
192	(format stream " const struct ~A *_vt;~%"
193	(vtable-struct-tag class chain-head))))))
194
195	(defmethod add-output-hooks progn
196	((islots islots) (reason (eql :h)) sequencer)
197	(with-slots (class subclass slots) islots
198	(sequence-output (stream sequencer)
199	((subclass :ichain (sod-class-chain-head class) :slots)
200	(format stream " struct ~A ~A;~%"
201	(islots-struct-tag class)
202	(sod-class-nickname class))))))
203
204	;;;--------------------------------------------------------------------------
205	;;; Vtable structure.
206
207	(defmethod add-output-hooks progn ((vtable vtable) reason sequencer)
208	(with-slots (body) vtable
209	(dolist (item body) (add-output-hooks item reason sequencer))))
210
211	(defmethod add-output-hooks progn
212	((vtable vtable) (reason (eql :h)) sequencer)
213	(with-slots (class chain-head) vtable
214	(sequence-output (stream sequencer)
215	:constraint ((class :vtables :start)
216	(class :vtable chain-head :start)
217	(class :vtable chain-head :slots)
218	(class :vtable chain-head :end)
219	(class :vtables :end))
220	((class :vtable chain-head :start)
221	(format stream "struct ~A {~%" (vtable-struct-tag class chain-head)))
222	((class :vtable chain-head :end)
223	(format stream "};~2%"))
224	((class :vtable-externs)
225	(format stream "~@<extern struct ~A ~2I~_~A__vtable_~A;~:>~%"
226	(vtable-struct-tag class chain-head)
227	class (sod-class-nickname chain-head))))))
228
229	(defmethod add-output-hooks progn
230	((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
231	(with-slots (class subclass chain-head) vtmsgs
232	(sequence-output (stream sequencer)
233	((subclass :vtable chain-head :slots)
234	(format stream " struct ~A ~A;~%"
235	(vtmsgs-struct-tag subclass class)
236	(sod-class-nickname class))))))
237
238	(defmethod add-output-hooks progn
239	((vtmsgs vtmsgs) (reason (eql 'populate-vtmsgs)) sequencer)
240	(when (vtmsgs-entries vtmsgs)
241	(with-slots (class subclass) vtmsgs
242	(sequence-output (stream sequencer)
243	:constraint ((subclass :vtmsgs :start)
244	(subclass :vtmsgs class :start)
245	(subclass :vtmsgs class :slots)
246	(subclass :vtmsgs class :end)
247	(subclass :vtmsgs :end))
248	((subclass :vtmsgs class :start)
249	(format stream "struct ~A {~%" (vtmsgs-struct-tag subclass class)))
250	((subclass :vtmsgs class :end)
251	(format stream "};~2%"))))))
252
253	(defmethod add-output-hooks progn ((vtmsgs vtmsgs) reason sequencer)
254	(with-slots (entries) vtmsgs
255	(dolist (entry entries) (add-output-hooks entry reason sequencer))))
256
257	(defmethod add-output-hooks progn ((entry method-entry) reason sequencer)
258	(with-slots (method) entry
259	(add-output-hooks method reason sequencer)))
260
261	(defmethod add-output-hooks progn
262	((method effective-method) (reason (eql 'populate-vtmsgs)) sequencer)
263	(let* ((message (effective-method-message method))
264	(class (effective-method-class method))
265	(class-type (find-class-type (sod-class-name class)))
266	(raw-type (sod-message-type message))
267	(type (c-type (* (fun (lisp (c-type-subtype raw-type))
268	("/me/" (* (lisp class-type)))
269	. (commentify-argument-names
270	(c-function-arguments raw-type)))))))
271	(sequence-output (stream sequencer)
272	((class :vtmsgs (sod-message-class message) :slots)
273	(pprint-logical-block (stream nil :prefix " " :suffix ";")
274	(pprint-c-type type stream (sod-message-name message)))
275	(terpri stream)))))
276
277	(defmethod add-output-hooks progn
278	((cptr class-pointer) (reason (eql :h)) sequencer)
279	(with-slots (class chain-head metaclass meta-chain-head) cptr
280	(sequence-output (stream sequencer)
281	((class :vtable chain-head :slots)
282	(format stream " const ~A ~:[_class~;~:_cls_~A~];~%"
283	metaclass
284	(if (sod-class-direct-superclasses meta-chain-head)
285	(sod-class-nickname meta-chain-head)
286	nil))))))
287
288	(defmethod add-output-hooks progn
289	((boff base-offset) (reason (eql :h)) sequencer)
290	(with-slots (class chain-head) boff
291	(sequence-output (stream sequencer)
292	((class :vtable chain-head :slots)
293	(write-line " size_t _base;" stream)))))
294
295	(defmethod add-output-hooks progn
296	((choff chain-offset) (reason (eql :h)) sequencer)
297	(with-slots (class chain-head target-head) choff
298	(sequence-output (stream sequencer)
299	((class :vtable chain-head :slots)
300	(format stream " ptrdiff_t _off_~A;~%"
301	(sod-class-nickname target-head))))))
302
303	;;;--------------------------------------------------------------------------
304	;;; Testing.
305
306	#+test
307	(defun test (name)
308	(let ((sequencer (make-instance 'sequencer))
309	(class (find-sod-class name)))
310	(add-output-hooks class :h sequencer)
311	(invoke-sequencer-items sequencer standard-output)
312	sequencer))
313
314	;;;----- That's all, folks --------------------------------------------------