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1 | ;;; -*-lisp-*- |
2 | ;;; | |
dea4d055 | 3 | ;;; Method combination implementation |
1f1d88f5 MW |
4 | ;;; |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
dea4d055 | 10 | ;;; This file is part of the Sensble Object Design, an object system for C. |
1f1d88f5 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 | ;;;-------------------------------------------------------------------------- | |
1f1d88f5 MW |
29 | ;;; Message classes. |
30 | ||
dea4d055 | 31 | (export 'basic-message) |
1f1d88f5 MW |
32 | (defclass basic-message (sod-message) |
33 | ((argument-tail :type list :reader sod-message-argument-tail) | |
34 | (no-varargs-tail :type list :reader sod-message-no-varargs-tail)) | |
35 | (:documentation | |
36 | "Base class for built-in message classes. | |
37 | ||
38 | Provides the basic functionality for the built-in method combinations. | |
39 | This is a separate class so that `special effect' messages can avoid | |
40 | inheriting its default behaviour. | |
41 | ||
dea4d055 | 42 | The function type protocol is implemented on `basic-message' using slot |
1f1d88f5 | 43 | reader methods. The actual values are computed on demand in methods |
dea4d055 | 44 | defined on `slot-unbound'.")) |
1f1d88f5 MW |
45 | |
46 | (defmethod slot-unbound (class | |
47 | (message basic-message) | |
48 | (slot-name (eql 'argument-tail))) | |
1d8cc67a | 49 | (declare (ignore class)) |
1f1d88f5 | 50 | (let ((seq 0)) |
dea4d055 MW |
51 | (setf (slot-value message 'argument-tail) |
52 | (mapcar (lambda (arg) | |
53 | (if (or (eq arg :ellipsis) (argument-name arg)) arg | |
54 | (make-argument (make-instance 'temporary-argument | |
55 | :tag (prog1 seq | |
56 | (incf seq))) | |
57 | (argument-type arg)))) | |
58 | (c-function-arguments (sod-message-type message)))))) | |
1f1d88f5 MW |
59 | |
60 | (defmethod slot-unbound (class | |
61 | (message basic-message) | |
62 | (slot-name (eql 'no-varargs-tail))) | |
1d8cc67a | 63 | (declare (ignore class)) |
dea4d055 MW |
64 | (setf (slot-value message 'no-varargs-tail) |
65 | (mapcar (lambda (arg) | |
66 | (if (eq arg :ellipsis) | |
67 | (make-argument *sod-ap* (c-type va-list)) | |
68 | arg)) | |
69 | (sod-message-argument-tail message)))) | |
1f1d88f5 MW |
70 | |
71 | (defmethod sod-message-method-class | |
72 | ((message basic-message) (class sod-class) pset) | |
73 | (let ((role (get-property pset :role :keyword nil))) | |
74 | (case role | |
75 | ((:before :after) 'daemon-direct-method) | |
76 | (:around 'delegating-direct-method) | |
77 | ((nil) (error "How odd: a primary method slipped through the net")) | |
78 | (t (error "Unknown method role ~A" role))))) | |
79 | ||
dea4d055 MW |
80 | (export 'simple-message) |
81 | (defclass simple-message (basic-message) | |
82 | () | |
83 | (:documentation | |
84 | "Base class for messages with `simple' method combinations. | |
1f1d88f5 | 85 | |
dea4d055 | 86 | A simple method combination is one which has only one method role other |
3109662a MW |
87 | than the `before', `after' and `around' methods provided by |
88 | `basic-message'. We call these `primary' methods, and the programmer | |
89 | designates them by not specifying an explicit role. | |
1f1d88f5 | 90 | |
dea4d055 MW |
91 | If the programmer doesn't define any primary methods then the effective |
92 | method is null -- i.e., the method entry pointer shows up as a null | |
93 | pointer.")) | |
94 | ||
95 | (defmethod sod-message-method-class | |
96 | ((message simple-message) (class sod-class) pset) | |
97 | (if (get-property pset :role :keyword nil) | |
98 | (call-next-method) | |
99 | (primary-method-class message))) | |
1f1d88f5 MW |
100 | |
101 | ;;;-------------------------------------------------------------------------- | |
102 | ;;; Direct method classes. | |
103 | ||
dea4d055 | 104 | (export 'basic-direct-method) |
1f1d88f5 | 105 | (defclass basic-direct-method (sod-method) |
77027cca MW |
106 | ((role :initarg :role :type symbol :reader sod-method-role) |
107 | (function-type :type c-function-type :reader sod-method-function-type)) | |
1f1d88f5 MW |
108 | (:documentation |
109 | "Base class for built-in direct method classes. | |
110 | ||
111 | Provides the basic functionality for the built-in direct-method classes. | |
112 | This is a separate class so that `special effect' methods can avoid | |
113 | inheriting its default behaviour and slots. | |
114 | ||
115 | A basic method can be assigned a `role', which may be set either as an | |
dea4d055 | 116 | initarg or using the `:role' property. Roles are used for method |
1f1d88f5 MW |
117 | categorization. |
118 | ||
dea4d055 | 119 | The function type protocol is implemented on `basic-direct-method' using |
1f1d88f5 | 120 | slot reader methods. The actual values are computed on demand in methods |
dea4d055 | 121 | defined on `slot-unbound'.")) |
1f1d88f5 MW |
122 | |
123 | (defmethod shared-initialize :after | |
124 | ((method basic-direct-method) slot-names &key pset) | |
125 | (declare (ignore slot-names)) | |
126 | (default-slot (method 'role) (get-property pset :role :keyword nil))) | |
127 | ||
128 | (defmethod slot-unbound | |
129 | (class (method basic-direct-method) (slot-name (eql 'function-type))) | |
1d8cc67a | 130 | (declare (ignore class)) |
1f1d88f5 MW |
131 | (let ((type (sod-method-type method))) |
132 | (setf (slot-value method 'function-type) | |
133 | (c-type (fun (lisp (c-type-subtype type)) | |
134 | ("me" (* (class (sod-method-class method)))) | |
135 | . (c-function-arguments type)))))) | |
136 | ||
ddee4bb1 | 137 | (defmethod sod-method-function-name ((method basic-direct-method)) |
1f1d88f5 MW |
138 | (with-slots (class role message) method |
139 | (format nil "~A__~@[~(~A~)_~]method_~A__~A" class role | |
140 | (sod-class-nickname (sod-message-class message)) | |
141 | (sod-message-name message)))) | |
142 | ||
dea4d055 | 143 | (export 'daemon-direct-method) |
1f1d88f5 MW |
144 | (defclass daemon-direct-method (basic-direct-method) |
145 | () | |
146 | (:documentation | |
147 | "A daemon direct method is invoked for side effects and cannot override. | |
148 | ||
149 | This is the direct method class for `before' and `after' methods, which | |
150 | cannot choose to override the remaining methods and are not involved in | |
151 | the computation of the final result. | |
152 | ||
153 | In C terms, a daemon method must return `void', and is not passed a | |
154 | `next_method' pointer.")) | |
155 | ||
dea4d055 MW |
156 | (defmethod check-method-type ((method daemon-direct-method) |
157 | (message sod-message) | |
158 | (type c-function-type)) | |
1f1d88f5 MW |
159 | (with-slots ((msgtype type)) message |
160 | (unless (c-type-equal-p (c-type-subtype type) (c-type void)) | |
161 | (error "Method return type ~A must be `void'" (c-type-subtype type))) | |
162 | (unless (argument-lists-compatible-p (c-function-arguments msgtype) | |
163 | (c-function-arguments type)) | |
164 | (error "Method arguments ~A don't match message ~A" type msgtype)))) | |
165 | ||
dea4d055 | 166 | (export 'delegating-direct-method) |
1f1d88f5 MW |
167 | (defclass delegating-direct-method (basic-direct-method) |
168 | ((next-method-type :type c-function-type | |
169 | :reader sod-method-next-method-type)) | |
170 | (:documentation | |
171 | "A delegating direct method can choose to override other methods. | |
172 | ||
173 | This is the direct method class for `around' and standard-method- | |
174 | combination primary methods, which are given the choice of computing the | |
175 | entire method's result or delegating to (usually) less-specific methods. | |
176 | ||
177 | In C terms, a delegating method is passed a `next_method' pointer so that | |
178 | it can delegate part of its behaviour. (A delegating direct method for a | |
179 | varargs message is also given an additional `va_list' argument, | |
180 | conventionally named `sod__ap_master', which it is expected to pass on to | |
181 | its `next_method' function if necessary.) | |
182 | ||
bf090e02 | 183 | The function type protocol is implemented on `delegating-direct-method' |
1f1d88f5 | 184 | using slot reader methods. The actual values are computed on demand in |
bf090e02 | 185 | methods defined on `slot-unbound'.")) |
1f1d88f5 MW |
186 | |
187 | (defmethod slot-unbound (class | |
188 | (method delegating-direct-method) | |
189 | (slot-name (eql 'next-method-type))) | |
1d8cc67a | 190 | (declare (ignore class)) |
1f1d88f5 MW |
191 | (let* ((message (sod-method-message method)) |
192 | (type (sod-message-type message))) | |
193 | (setf (slot-value method 'next-method-type) | |
194 | (c-type (fun (lisp (c-type-subtype type)) | |
195 | ("me" (* (class (sod-method-class method)))) | |
9ec578d9 MW |
196 | . |
197 | (c-function-arguments type)))))) | |
1f1d88f5 MW |
198 | |
199 | (defmethod slot-unbound (class | |
200 | (method delegating-direct-method) | |
201 | (slot-name (eql 'function-type))) | |
1d8cc67a | 202 | (declare (ignore class)) |
1f1d88f5 MW |
203 | (let* ((message (sod-method-message method)) |
204 | (type (sod-method-type method)) | |
205 | (method-args (c-function-arguments type))) | |
206 | (setf (slot-value method 'function-type) | |
207 | (c-type (fun (lisp (c-type-subtype type)) | |
208 | ("me" (* (class (sod-method-class method)))) | |
209 | ("next_method" (* (lisp (commentify-function-type | |
210 | (sod-method-next-method-type | |
211 | method))))) | |
bf090e02 MW |
212 | . |
213 | (if (varargs-message-p message) | |
214 | (cons (make-argument *sod-master-ap* | |
215 | (c-type va-list)) | |
216 | method-args) | |
217 | method-args)))))) | |
1f1d88f5 MW |
218 | |
219 | ;;;-------------------------------------------------------------------------- | |
220 | ;;; Effective method classes. | |
221 | ||
dea4d055 | 222 | (export 'basic-effective-method) |
1f1d88f5 | 223 | (defclass basic-effective-method (effective-method) |
77027cca MW |
224 | ((around-methods :initarg :around-methods :initform nil |
225 | :type list :reader effective-method-around-methods) | |
226 | (before-methods :initarg :before-methods :initform nil | |
227 | :type list :reader effective-method-before-methods) | |
228 | (after-methods :initarg :after-methods :initform nil | |
229 | :type list :reader effective-method-after-methods) | |
1f1d88f5 MW |
230 | (basic-argument-names :type list |
231 | :reader effective-method-basic-argument-names) | |
232 | (functions :type list :reader effective-method-functions)) | |
233 | (:documentation | |
234 | "Base class for built-in effective method classes. | |
235 | ||
236 | This class maintains lists of the applicable `before', `after' and | |
237 | `around' methods and provides behaviour for invoking these methods | |
238 | correctly. | |
239 | ||
dea4d055 MW |
240 | The argument names protocol is implemented on `basic-effective-method' |
241 | using a slot reader method. The actual values are computed on demand in | |
242 | methods defined on `slot-unbound'.")) | |
1f1d88f5 MW |
243 | |
244 | (defmethod slot-unbound (class | |
245 | (method basic-effective-method) | |
246 | (slot-name (eql 'basic-argument-names))) | |
1d8cc67a | 247 | (declare (ignore class)) |
1f1d88f5 MW |
248 | (let ((message (effective-method-message method))) |
249 | (setf (slot-value method 'basic-argument-names) | |
250 | (subst *sod-master-ap* *sod-ap* | |
251 | (mapcar #'argument-name | |
252 | (sod-message-no-varargs-tail message)))))) | |
253 | ||
dea4d055 MW |
254 | (defmethod effective-method-function-name ((method effective-method)) |
255 | (let* ((class (effective-method-class method)) | |
256 | (message (effective-method-message method)) | |
257 | (message-class (sod-message-class message))) | |
258 | (format nil "~A__emethod_~A__~A" | |
259 | class | |
260 | (sod-class-nickname message-class) | |
261 | (sod-message-name message)))) | |
1f1d88f5 | 262 | |
dea4d055 MW |
263 | (defmethod slot-unbound |
264 | (class (method basic-effective-method) (slot-name (eql 'functions))) | |
1d8cc67a | 265 | (declare (ignore class)) |
dea4d055 MW |
266 | (setf (slot-value method 'functions) |
267 | (compute-method-entry-functions method))) | |
1f1d88f5 | 268 | |
dea4d055 MW |
269 | (export 'simple-effective-method) |
270 | (defclass simple-effective-method (basic-effective-method) | |
271 | ((primary-methods :initarg :primary-methods :initform nil | |
272 | :type list :reader effective-method-primary-methods)) | |
1f1d88f5 | 273 | (:documentation |
dea4d055 | 274 | "Effective method counterpart to `simple-message'.")) |
1f1d88f5 | 275 | |
dea4d055 MW |
276 | (defmethod shared-initialize :after |
277 | ((method simple-effective-method) slot-names &key direct-methods) | |
278 | (declare (ignore slot-names)) | |
279 | (categorize (method direct-methods :bind ((role (sod-method-role method)))) | |
280 | ((primary (null role)) | |
281 | (before (eq role :before)) | |
282 | (after (eq role :after)) | |
283 | (around (eq role :around))) | |
284 | (with-slots (primary-methods before-methods after-methods around-methods) | |
285 | method | |
286 | (setf primary-methods primary | |
287 | before-methods before | |
288 | after-methods (reverse after) | |
289 | around-methods around)))) | |
290 | ||
291 | ;;;-------------------------------------------------------------------------- | |
292 | ;;; Code generation. | |
1f1d88f5 MW |
293 | |
294 | (defmethod shared-initialize :after | |
295 | ((codegen method-codegen) slot-names &key) | |
1d8cc67a | 296 | (declare (ignore slot-names)) |
1f1d88f5 MW |
297 | (with-slots (message target) codegen |
298 | (setf target | |
299 | (if (eq (c-type-subtype (sod-message-type message)) (c-type void)) | |
300 | :void | |
301 | :return)))) | |
302 | ||
dea4d055 MW |
303 | ;;;-------------------------------------------------------------------------- |
304 | ;;; Invoking direct methods. | |
1f1d88f5 | 305 | |
dea4d055 | 306 | (export 'basic-effective-method-body) |
1f1d88f5 MW |
307 | (defun basic-effective-method-body (codegen target method body) |
308 | "Build the common method-invocation structure. | |
309 | ||
310 | Writes to CODEGEN some basic method-invocation instructions. It invokes | |
311 | the `around' methods, from most- to least-specific. If they all delegate, | |
312 | then the `before' methods are run, most-specific first; next, the | |
313 | instructions generated by BODY (invoked with a target argument); then, the | |
314 | `after' methods are run, least-specific first; and, finally, the value | |
315 | delivered by the BODY is returned to the `around' methods. The result | |
316 | returned by the outermost `around' method -- or, if there are none, | |
317 | delivered by the BODY -- is finally delivered to the TARGET." | |
318 | ||
319 | (with-slots (message class before-methods after-methods around-methods) | |
320 | method | |
321 | (let* ((message-type (sod-message-type message)) | |
322 | (return-type (c-type-subtype message-type)) | |
323 | (voidp (eq return-type (c-type void))) | |
324 | (basic-tail (effective-method-basic-argument-names method))) | |
325 | (flet ((method-kernel (target) | |
326 | (dolist (before before-methods) | |
327 | (invoke-method codegen :void basic-tail before)) | |
328 | (if (or voidp (null after-methods)) | |
329 | (funcall body target) | |
330 | (convert-stmts codegen target return-type | |
331 | (lambda (target) | |
332 | (funcall body target) | |
333 | (dolist (after (reverse after-methods)) | |
334 | (invoke-method codegen :void | |
335 | after basic-tail))))))) | |
336 | (invoke-delegation-chain codegen target basic-tail | |
337 | around-methods #'method-kernel))))) | |
338 | ||
339 | ;;;-------------------------------------------------------------------------- | |
dea4d055 | 340 | ;;; Method entry points. |
1f1d88f5 | 341 | |
a07d8d00 | 342 | (defparameter *method-entry-inline-threshold* 200 |
1f1d88f5 MW |
343 | "Threshold below which effective method bodies are inlined into entries. |
344 | ||
345 | After the effective method body has been computed, we calculate its | |
346 | metric, multiply by the number of entries we need to generate, and compare | |
347 | it with this threshold. If the metric is below the threshold then we | |
348 | fold the method body into the entry functions; otherwise we split the | |
349 | effective method out into its own function.") | |
350 | ||
1f1d88f5 MW |
351 | (defmethod method-entry-function-name |
352 | ((method effective-method) (chain-head sod-class)) | |
353 | (let* ((class (effective-method-class method)) | |
354 | (message (effective-method-message method)) | |
355 | (message-class (sod-message-class message))) | |
dea4d055 MW |
356 | (if (or (not (slot-boundp method 'functions)) |
357 | (slot-value method 'functions)) | |
358 | (format nil "~A__mentry_~A__~A__chain_~A" | |
359 | class | |
360 | (sod-class-nickname message-class) | |
361 | (sod-message-name message) | |
362 | (sod-class-nickname chain-head)) | |
363 | 0))) | |
364 | ||
365 | (defmethod method-entry-function-type ((entry method-entry)) | |
366 | (let* ((method (method-entry-effective-method entry)) | |
367 | (message (effective-method-message method)) | |
368 | (type (sod-message-type message))) | |
369 | (c-type (fun (lisp (c-type-subtype type)) | |
370 | ("me" (* (class (method-entry-chain-tail entry)))) | |
371 | . (sod-message-argument-tail message))))) | |
372 | ||
373 | (defmethod make-method-entry ((method basic-effective-method) | |
374 | (chain-head sod-class) (chain-tail sod-class)) | |
375 | (make-instance 'method-entry | |
376 | :method method | |
377 | :chain-head chain-head | |
378 | :chain-tail chain-tail)) | |
1f1d88f5 MW |
379 | |
380 | (defmethod compute-method-entry-functions ((method basic-effective-method)) | |
381 | ||
382 | ;; OK, there's quite a lot of this, so hold tight. | |
383 | ;; | |
384 | ;; The first thing we need to do is find all of the related objects. This | |
385 | ;; is a bit verbose but fairly straightforward. | |
386 | ;; | |
bf090e02 MW |
387 | ;; Next, we generate the effective method body -- using `compute-effective- |
388 | ;; method-body' of all things. This gives us the declarations and body for | |
1f1d88f5 MW |
389 | ;; an effective method function, but we don't have an actual function yet. |
390 | ;; | |
391 | ;; Now we look at the chains which are actually going to need a method | |
392 | ;; entry: only those chains whose tail (most specific) class is a | |
393 | ;; superclass of the class which defined the message need an entry. We | |
394 | ;; build a list of these tail classes. | |
395 | ;; | |
396 | ;; Having done this, we decide whether it's better to generate a standalone | |
397 | ;; effective-method function and call it from each of the method entries, | |
398 | ;; or to inline the effective method body into each of the entries. | |
399 | ;; | |
400 | ;; Most of the complexity here comes from (a) dealing with the two | |
401 | ;; different strategies for constructing method entry functions and (b) | |
402 | ;; (unsurprisingly) the mess involved with dealing with varargs messages. | |
403 | ||
404 | (let* ((message (effective-method-message method)) | |
405 | (class (effective-method-class method)) | |
406 | (message-class (sod-message-class message)) | |
407 | (return-type (c-type-subtype (sod-message-type message))) | |
408 | (codegen (make-instance 'method-codegen | |
409 | :message message | |
410 | :class class | |
411 | :method method)) | |
412 | ||
413 | ;; Effective method function details. | |
414 | (emf-name (effective-method-function-name method)) | |
415 | (ilayout-type (c-type (* (struct (ilayout-struct-tag class))))) | |
416 | (emf-arg-tail (mapcar (lambda (arg) | |
417 | (if (eq (argument-name arg) *sod-ap*) | |
418 | (make-argument *sod-master-ap* | |
419 | (c-type va-list)) | |
420 | arg)) | |
421 | (sod-message-no-varargs-tail message))) | |
422 | (emf-type (c-type (fun (lisp return-type) | |
423 | ("sod__obj" (lisp ilayout-type)) | |
424 | . (sod-message-no-varargs-tail message)))) | |
1f1d88f5 MW |
425 | |
426 | ;; Method entry details. | |
427 | (chain-tails (remove-if-not (lambda (super) | |
428 | (sod-subclass-p super message-class)) | |
429 | (mapcar #'car | |
430 | (sod-class-chains class)))) | |
431 | (n-entries (length chain-tails)) | |
432 | (entry-args (sod-message-argument-tail message)) | |
433 | (parm-n (do ((prev "me" (car args)) | |
434 | (args entry-args (cdr args))) | |
435 | ((endp args) nil) | |
436 | (when (eq (car args) :ellipsis) | |
437 | (return prev)))) | |
438 | (entry-target (codegen-target codegen))) | |
439 | ||
dea4d055 MW |
440 | (flet ((setup-entry (tail) |
441 | (let ((head (sod-class-chain-head tail))) | |
442 | (codegen-push codegen) | |
443 | (ensure-var codegen "sod__obj" ilayout-type | |
444 | (make-convert-to-ilayout-inst class | |
445 | head "me")))) | |
446 | (varargs-prologue () | |
447 | (ensure-var codegen *sod-master-ap* (c-type va-list)) | |
448 | (emit-inst codegen | |
449 | (make-va-start-inst *sod-master-ap* parm-n))) | |
450 | (varargs-epilogue () | |
451 | (emit-inst codegen (make-va-end-inst *sod-master-ap*))) | |
452 | (finish-entry (tail) | |
453 | (let* ((head (sod-class-chain-head tail)) | |
454 | (name (method-entry-function-name method head)) | |
455 | (type (c-type (fun (lisp return-type) | |
456 | ("me" (* (class tail))) | |
457 | . entry-args)))) | |
458 | (codegen-pop-function codegen name type)))) | |
1f1d88f5 MW |
459 | |
460 | ;; Generate the method body. We'll work out what to do with it later. | |
461 | (codegen-push codegen) | |
9ec578d9 MW |
462 | (let* ((result (if (eq return-type (c-type void)) nil |
463 | (temporary-var codegen return-type))) | |
464 | (emf-target (or result :void))) | |
465 | (compute-effective-method-body method codegen emf-target) | |
466 | (multiple-value-bind (vars insts) (codegen-pop codegen) | |
467 | (cond ((or (= n-entries 1) | |
468 | (<= (* n-entries (reduce #'+ insts :key #'inst-metric)) | |
469 | *method-entry-inline-threshold*)) | |
470 | ||
471 | ;; The effective method body is simple -- or there's only | |
472 | ;; one of them. We'll inline the method body into the entry | |
473 | ;; functions. | |
1f1d88f5 MW |
474 | (dolist (tail chain-tails) |
475 | (setup-entry tail) | |
9ec578d9 MW |
476 | (dolist (var vars) |
477 | (ensure-var codegen (inst-name var) | |
478 | (inst-type var) (inst-init var))) | |
479 | (when parm-n (varargs-prologue)) | |
480 | (emit-insts codegen insts) | |
481 | (when parm-n (varargs-epilogue)) | |
482 | (deliver-expr codegen entry-target result) | |
483 | (finish-entry tail))) | |
484 | ||
485 | (t | |
486 | ||
487 | ;; The effective method body is complicated and we'd need | |
488 | ;; more than one copy. We'll generate an effective method | |
489 | ;; function and call it a lot. | |
490 | (codegen-build-function codegen emf-name emf-type vars | |
491 | (nconc insts (and result | |
492 | (list (make-return-inst result))))) | |
493 | ||
494 | (let ((call (make-call-inst emf-name | |
495 | (cons "sod__obj" (mapcar #'argument-name | |
496 | emf-arg-tail))))) | |
497 | (dolist (tail chain-tails) | |
498 | (setup-entry tail) | |
499 | (cond (parm-n | |
500 | (varargs-prologue) | |
501 | (convert-stmts codegen entry-target return-type | |
502 | (lambda (target) | |
503 | (deliver-expr codegen | |
504 | target call) | |
505 | (varargs-epilogue)))) | |
506 | (t | |
507 | (deliver-expr codegen entry-target call))) | |
508 | (finish-entry tail))))))) | |
1f1d88f5 MW |
509 | |
510 | (codegen-functions codegen)))) | |
511 | ||
dea4d055 MW |
512 | (defmethod compute-method-entry-functions |
513 | ((method simple-effective-method)) | |
514 | (if (effective-method-primary-methods method) | |
515 | (call-next-method) | |
516 | nil)) | |
517 | ||
518 | (defmethod compute-effective-method-body | |
519 | ((method simple-effective-method) codegen target) | |
520 | (with-slots (message basic-argument-names primary-methods) method | |
521 | (basic-effective-method-body codegen target method | |
522 | (lambda (target) | |
523 | (simple-method-body method | |
524 | codegen | |
525 | target))))) | |
1f1d88f5 | 526 | |
dea4d055 MW |
527 | ;;;-------------------------------------------------------------------------- |
528 | ;;; Standard method combination. | |
ddee4bb1 | 529 | |
dea4d055 MW |
530 | (export 'standard-message) |
531 | (defclass standard-message (simple-message) | |
532 | () | |
533 | (:documentation | |
534 | "Message class for standard method combination. | |
1f1d88f5 | 535 | |
dea4d055 MW |
536 | Standard method combination is a simple method combination where the |
537 | primary methods are invoked as a delegation chain, from most- to | |
538 | least-specific.")) | |
539 | ||
540 | (export 'standard-effective-method) | |
541 | (defclass standard-effective-method (simple-effective-method) () | |
542 | (:documentation "Effective method counterpart to `standard-message'.")) | |
543 | ||
544 | (defmethod primary-method-class ((message standard-message)) | |
545 | 'delegating-direct-method) | |
546 | ||
547 | (defmethod message-effective-method-class ((message standard-message)) | |
548 | 'standard-effective-method) | |
549 | ||
550 | (defmethod simple-method-body | |
551 | ((method standard-effective-method) codegen target) | |
552 | (invoke-delegation-chain codegen | |
553 | target | |
554 | (effective-method-basic-argument-names method) | |
555 | (effective-method-primary-methods method) | |
556 | nil)) | |
a07d8d00 | 557 | |
1f1d88f5 | 558 | ;;;----- That's all, folks -------------------------------------------------- |