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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 | ;;; | |
e0808c47 | 10 | ;;; This file is part of the Sensible 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 |
6e6b0958 | 43 | reader methods. The actual values are computed on demand.")) |
1f1d88f5 | 44 | |
6e6b0958 | 45 | (define-on-demand-slot basic-message argument-tail (message) |
1f1d88f5 | 46 | (let ((seq 0)) |
6e6b0958 MW |
47 | (mapcar (lambda (arg) |
48 | (if (or (eq arg :ellipsis) (argument-name arg)) arg | |
49 | (make-argument (make-instance 'temporary-argument | |
50 | :tag (prog1 seq | |
51 | (incf seq))) | |
52 | (argument-type arg)))) | |
53 | (c-function-arguments (sod-message-type message))))) | |
54 | ||
55 | (define-on-demand-slot basic-message no-varargs-tail (message) | |
074650bc | 56 | (reify-variable-argument-tail (sod-message-argument-tail message))) |
1f1d88f5 MW |
57 | |
58 | (defmethod sod-message-method-class | |
59 | ((message basic-message) (class sod-class) pset) | |
60 | (let ((role (get-property pset :role :keyword nil))) | |
61 | (case role | |
62 | ((:before :after) 'daemon-direct-method) | |
63 | (:around 'delegating-direct-method) | |
64 | ((nil) (error "How odd: a primary method slipped through the net")) | |
65 | (t (error "Unknown method role ~A" role))))) | |
66 | ||
dea4d055 MW |
67 | (export 'simple-message) |
68 | (defclass simple-message (basic-message) | |
69 | () | |
70 | (:documentation | |
71 | "Base class for messages with `simple' method combinations. | |
1f1d88f5 | 72 | |
dea4d055 | 73 | A simple method combination is one which has only one method role other |
3109662a MW |
74 | than the `before', `after' and `around' methods provided by |
75 | `basic-message'. We call these `primary' methods, and the programmer | |
76 | designates them by not specifying an explicit role. | |
1f1d88f5 | 77 | |
dea4d055 MW |
78 | If the programmer doesn't define any primary methods then the effective |
79 | method is null -- i.e., the method entry pointer shows up as a null | |
80 | pointer.")) | |
81 | ||
82 | (defmethod sod-message-method-class | |
83 | ((message simple-message) (class sod-class) pset) | |
84 | (if (get-property pset :role :keyword nil) | |
85 | (call-next-method) | |
86 | (primary-method-class message))) | |
1f1d88f5 | 87 | |
d7e47285 MW |
88 | (defmethod primary-method-class ((message simple-message)) |
89 | 'basic-direct-method) | |
90 | ||
1f1d88f5 MW |
91 | ;;;-------------------------------------------------------------------------- |
92 | ;;; Direct method classes. | |
93 | ||
11e41ddf | 94 | (export '(basic-direct-method sod-method-role)) |
1f1d88f5 | 95 | (defclass basic-direct-method (sod-method) |
77027cca MW |
96 | ((role :initarg :role :type symbol :reader sod-method-role) |
97 | (function-type :type c-function-type :reader sod-method-function-type)) | |
1f1d88f5 MW |
98 | (:documentation |
99 | "Base class for built-in direct method classes. | |
100 | ||
101 | Provides the basic functionality for the built-in direct-method classes. | |
102 | This is a separate class so that `special effect' methods can avoid | |
103 | inheriting its default behaviour and slots. | |
104 | ||
105 | A basic method can be assigned a `role', which may be set either as an | |
dea4d055 | 106 | initarg or using the `:role' property. Roles are used for method |
1f1d88f5 MW |
107 | categorization. |
108 | ||
dea4d055 | 109 | The function type protocol is implemented on `basic-direct-method' using |
6e6b0958 | 110 | slot reader methods.")) |
1f1d88f5 MW |
111 | |
112 | (defmethod shared-initialize :after | |
113 | ((method basic-direct-method) slot-names &key pset) | |
114 | (declare (ignore slot-names)) | |
115 | (default-slot (method 'role) (get-property pset :role :keyword nil))) | |
116 | ||
6e6b0958 | 117 | (define-on-demand-slot basic-direct-method function-type (method) |
1f1d88f5 | 118 | (let ((type (sod-method-type method))) |
6e6b0958 MW |
119 | (c-type (fun (lisp (c-type-subtype type)) |
120 | ("me" (* (class (sod-method-class method)))) | |
121 | . (c-function-arguments type))))) | |
1f1d88f5 | 122 | |
ddee4bb1 | 123 | (defmethod sod-method-function-name ((method basic-direct-method)) |
4b8e5c03 | 124 | (with-slots ((class %class) role message) method |
1f1d88f5 MW |
125 | (format nil "~A__~@[~(~A~)_~]method_~A__~A" class role |
126 | (sod-class-nickname (sod-message-class message)) | |
127 | (sod-message-name message)))) | |
128 | ||
dea4d055 | 129 | (export 'daemon-direct-method) |
1f1d88f5 MW |
130 | (defclass daemon-direct-method (basic-direct-method) |
131 | () | |
132 | (:documentation | |
133 | "A daemon direct method is invoked for side effects and cannot override. | |
134 | ||
135 | This is the direct method class for `before' and `after' methods, which | |
136 | cannot choose to override the remaining methods and are not involved in | |
137 | the computation of the final result. | |
138 | ||
139 | In C terms, a daemon method must return `void', and is not passed a | |
140 | `next_method' pointer.")) | |
141 | ||
dea4d055 MW |
142 | (defmethod check-method-type ((method daemon-direct-method) |
143 | (message sod-message) | |
144 | (type c-function-type)) | |
4b8e5c03 | 145 | (with-slots ((msgtype %type)) message |
b70cb6d8 MW |
146 | (check-method-return-type type c-type-void) |
147 | (check-method-argument-lists type msgtype))) | |
1f1d88f5 | 148 | |
dea4d055 | 149 | (export 'delegating-direct-method) |
1f1d88f5 MW |
150 | (defclass delegating-direct-method (basic-direct-method) |
151 | ((next-method-type :type c-function-type | |
152 | :reader sod-method-next-method-type)) | |
153 | (:documentation | |
154 | "A delegating direct method can choose to override other methods. | |
155 | ||
156 | This is the direct method class for `around' and standard-method- | |
157 | combination primary methods, which are given the choice of computing the | |
158 | entire method's result or delegating to (usually) less-specific methods. | |
159 | ||
160 | In C terms, a delegating method is passed a `next_method' pointer so that | |
161 | it can delegate part of its behaviour. (A delegating direct method for a | |
162 | varargs message is also given an additional `va_list' argument, | |
163 | conventionally named `sod__ap_master', which it is expected to pass on to | |
164 | its `next_method' function if necessary.) | |
165 | ||
bf090e02 | 166 | The function type protocol is implemented on `delegating-direct-method' |
6e6b0958 | 167 | using slot reader methods..")) |
1f1d88f5 | 168 | |
6e6b0958 | 169 | (define-on-demand-slot delegating-direct-method next-method-type (method) |
1f1d88f5 | 170 | (let* ((message (sod-method-message method)) |
e5fae432 MW |
171 | (return-type (c-type-subtype (sod-message-type message))) |
172 | (msgargs (sod-message-argument-tail message)) | |
173 | (arguments (if (varargs-message-p message) | |
e85df3ff | 174 | (cons (make-argument *sod-master-ap* c-type-va-list) |
e5fae432 MW |
175 | (butlast msgargs)) |
176 | msgargs))) | |
6e6b0958 MW |
177 | (c-type (fun (lisp return-type) |
178 | ("me" (* (class (sod-method-class method)))) | |
179 | . arguments)))) | |
180 | ||
181 | (define-on-demand-slot delegating-direct-method function-type (method) | |
1f1d88f5 MW |
182 | (let* ((message (sod-method-message method)) |
183 | (type (sod-method-type method)) | |
184 | (method-args (c-function-arguments type))) | |
6e6b0958 MW |
185 | (c-type (fun (lisp (c-type-subtype type)) |
186 | ("me" (* (class (sod-method-class method)))) | |
187 | ("next_method" (* (lisp (commentify-function-type | |
188 | (sod-method-next-method-type | |
189 | method))))) | |
190 | . | |
191 | (if (varargs-message-p message) | |
e85df3ff | 192 | (cons (make-argument *sod-master-ap* c-type-va-list) |
6e6b0958 MW |
193 | method-args) |
194 | method-args))))) | |
1f1d88f5 MW |
195 | |
196 | ;;;-------------------------------------------------------------------------- | |
197 | ;;; Effective method classes. | |
198 | ||
11e41ddf MW |
199 | (export '(basic-effective-method |
200 | effective-method-around-methods effective-method-before-methods | |
201 | effective-method-after-methods)) | |
1f1d88f5 | 202 | (defclass basic-effective-method (effective-method) |
77027cca MW |
203 | ((around-methods :initarg :around-methods :initform nil |
204 | :type list :reader effective-method-around-methods) | |
205 | (before-methods :initarg :before-methods :initform nil | |
206 | :type list :reader effective-method-before-methods) | |
207 | (after-methods :initarg :after-methods :initform nil | |
208 | :type list :reader effective-method-after-methods) | |
1f1d88f5 MW |
209 | (basic-argument-names :type list |
210 | :reader effective-method-basic-argument-names) | |
211 | (functions :type list :reader effective-method-functions)) | |
212 | (:documentation | |
213 | "Base class for built-in effective method classes. | |
214 | ||
215 | This class maintains lists of the applicable `before', `after' and | |
216 | `around' methods and provides behaviour for invoking these methods | |
217 | correctly. | |
218 | ||
dea4d055 | 219 | The argument names protocol is implemented on `basic-effective-method' |
6e6b0958 | 220 | using a slot reader method.")) |
1f1d88f5 | 221 | |
6e6b0958 | 222 | (define-on-demand-slot basic-effective-method basic-argument-names (method) |
1f1d88f5 | 223 | (let ((message (effective-method-message method))) |
6e6b0958 MW |
224 | (mapcar #'argument-name |
225 | (sod-message-no-varargs-tail message)))) | |
1f1d88f5 | 226 | |
dea4d055 MW |
227 | (defmethod effective-method-function-name ((method effective-method)) |
228 | (let* ((class (effective-method-class method)) | |
229 | (message (effective-method-message method)) | |
230 | (message-class (sod-message-class message))) | |
231 | (format nil "~A__emethod_~A__~A" | |
232 | class | |
233 | (sod-class-nickname message-class) | |
234 | (sod-message-name message)))) | |
1f1d88f5 | 235 | |
6e6b0958 MW |
236 | (define-on-demand-slot basic-effective-method functions (method) |
237 | (compute-method-entry-functions method)) | |
1f1d88f5 | 238 | |
dea4d055 MW |
239 | (export 'simple-effective-method) |
240 | (defclass simple-effective-method (basic-effective-method) | |
241 | ((primary-methods :initarg :primary-methods :initform nil | |
242 | :type list :reader effective-method-primary-methods)) | |
1f1d88f5 | 243 | (:documentation |
dea4d055 | 244 | "Effective method counterpart to `simple-message'.")) |
1f1d88f5 | 245 | |
dea4d055 MW |
246 | (defmethod shared-initialize :after |
247 | ((method simple-effective-method) slot-names &key direct-methods) | |
248 | (declare (ignore slot-names)) | |
249 | (categorize (method direct-methods :bind ((role (sod-method-role method)))) | |
250 | ((primary (null role)) | |
251 | (before (eq role :before)) | |
252 | (after (eq role :after)) | |
253 | (around (eq role :around))) | |
254 | (with-slots (primary-methods before-methods after-methods around-methods) | |
255 | method | |
256 | (setf primary-methods primary | |
257 | before-methods before | |
258 | after-methods (reverse after) | |
259 | around-methods around)))) | |
260 | ||
261 | ;;;-------------------------------------------------------------------------- | |
262 | ;;; Code generation. | |
1f1d88f5 MW |
263 | |
264 | (defmethod shared-initialize :after | |
265 | ((codegen method-codegen) slot-names &key) | |
1d8cc67a | 266 | (declare (ignore slot-names)) |
1f1d88f5 MW |
267 | (with-slots (message target) codegen |
268 | (setf target | |
e85df3ff | 269 | (if (eq (c-type-subtype (sod-message-type message)) c-type-void) |
1f1d88f5 MW |
270 | :void |
271 | :return)))) | |
272 | ||
dea4d055 MW |
273 | ;;;-------------------------------------------------------------------------- |
274 | ;;; Invoking direct methods. | |
1f1d88f5 | 275 | |
dea4d055 | 276 | (export 'basic-effective-method-body) |
1f1d88f5 MW |
277 | (defun basic-effective-method-body (codegen target method body) |
278 | "Build the common method-invocation structure. | |
279 | ||
280 | Writes to CODEGEN some basic method-invocation instructions. It invokes | |
281 | the `around' methods, from most- to least-specific. If they all delegate, | |
282 | then the `before' methods are run, most-specific first; next, the | |
283 | instructions generated by BODY (invoked with a target argument); then, the | |
284 | `after' methods are run, least-specific first; and, finally, the value | |
285 | delivered by the BODY is returned to the `around' methods. The result | |
286 | returned by the outermost `around' method -- or, if there are none, | |
287 | delivered by the BODY -- is finally delivered to the TARGET." | |
288 | ||
4b8e5c03 MW |
289 | (with-slots (message (class %class) |
290 | before-methods after-methods around-methods) | |
1f1d88f5 MW |
291 | method |
292 | (let* ((message-type (sod-message-type message)) | |
293 | (return-type (c-type-subtype message-type)) | |
1f1d88f5 MW |
294 | (basic-tail (effective-method-basic-argument-names method))) |
295 | (flet ((method-kernel (target) | |
296 | (dolist (before before-methods) | |
297 | (invoke-method codegen :void basic-tail before)) | |
cb35f25e | 298 | (if (null after-methods) |
1f1d88f5 MW |
299 | (funcall body target) |
300 | (convert-stmts codegen target return-type | |
301 | (lambda (target) | |
302 | (funcall body target) | |
303 | (dolist (after (reverse after-methods)) | |
304 | (invoke-method codegen :void | |
a898c9e2 | 305 | basic-tail after))))))) |
1f1d88f5 MW |
306 | (invoke-delegation-chain codegen target basic-tail |
307 | around-methods #'method-kernel))))) | |
308 | ||
309 | ;;;-------------------------------------------------------------------------- | |
dea4d055 | 310 | ;;; Method entry points. |
1f1d88f5 | 311 | |
a07d8d00 | 312 | (defparameter *method-entry-inline-threshold* 200 |
1f1d88f5 MW |
313 | "Threshold below which effective method bodies are inlined into entries. |
314 | ||
315 | After the effective method body has been computed, we calculate its | |
316 | metric, multiply by the number of entries we need to generate, and compare | |
317 | it with this threshold. If the metric is below the threshold then we | |
318 | fold the method body into the entry functions; otherwise we split the | |
319 | effective method out into its own function.") | |
320 | ||
1f1d88f5 | 321 | (defmethod method-entry-function-name |
b426ab51 | 322 | ((method effective-method) (chain-head sod-class) role) |
1f1d88f5 MW |
323 | (let* ((class (effective-method-class method)) |
324 | (message (effective-method-message method)) | |
325 | (message-class (sod-message-class message))) | |
dea4d055 MW |
326 | (if (or (not (slot-boundp method 'functions)) |
327 | (slot-value method 'functions)) | |
b426ab51 MW |
328 | (format nil "~A__mentry~@[__~(~A~)~]_~A__~A__chain_~A" |
329 | class role | |
dea4d055 MW |
330 | (sod-class-nickname message-class) |
331 | (sod-message-name message) | |
332 | (sod-class-nickname chain-head)) | |
944caf84 | 333 | *null-pointer*))) |
dea4d055 | 334 | |
b426ab51 MW |
335 | (defmethod method-entry-slot-name ((entry method-entry)) |
336 | (let* ((method (method-entry-effective-method entry)) | |
337 | (message (effective-method-message method)) | |
338 | (name (sod-message-name message)) | |
339 | (role (method-entry-role entry))) | |
340 | (method-entry-slot-name-by-role entry role name))) | |
341 | ||
dea4d055 MW |
342 | (defmethod method-entry-function-type ((entry method-entry)) |
343 | (let* ((method (method-entry-effective-method entry)) | |
344 | (message (effective-method-message method)) | |
b426ab51 MW |
345 | (type (sod-message-type message)) |
346 | (tail (ecase (method-entry-role entry) | |
bf8aadd7 MW |
347 | ((nil) (sod-message-argument-tail message)) |
348 | (:valist (sod-message-no-varargs-tail message))))) | |
dea4d055 MW |
349 | (c-type (fun (lisp (c-type-subtype type)) |
350 | ("me" (* (class (method-entry-chain-tail entry)))) | |
b426ab51 MW |
351 | . tail)))) |
352 | ||
353 | (defmethod make-method-entries ((method basic-effective-method) | |
354 | (chain-head sod-class) | |
355 | (chain-tail sod-class)) | |
356 | (let ((entries nil) | |
357 | (message (effective-method-message method))) | |
358 | (flet ((make (role) | |
359 | (push (make-instance 'method-entry | |
360 | :method method :role role | |
361 | :chain-head chain-head | |
362 | :chain-tail chain-tail) | |
363 | entries))) | |
bf8aadd7 | 364 | (when (varargs-message-p message) (make :valist)) |
b426ab51 MW |
365 | (make nil) |
366 | entries))) | |
1f1d88f5 MW |
367 | |
368 | (defmethod compute-method-entry-functions ((method basic-effective-method)) | |
369 | ||
370 | ;; OK, there's quite a lot of this, so hold tight. | |
371 | ;; | |
372 | ;; The first thing we need to do is find all of the related objects. This | |
373 | ;; is a bit verbose but fairly straightforward. | |
374 | ;; | |
bf090e02 MW |
375 | ;; Next, we generate the effective method body -- using `compute-effective- |
376 | ;; method-body' of all things. This gives us the declarations and body for | |
1f1d88f5 MW |
377 | ;; an effective method function, but we don't have an actual function yet. |
378 | ;; | |
379 | ;; Now we look at the chains which are actually going to need a method | |
380 | ;; entry: only those chains whose tail (most specific) class is a | |
381 | ;; superclass of the class which defined the message need an entry. We | |
382 | ;; build a list of these tail classes. | |
383 | ;; | |
384 | ;; Having done this, we decide whether it's better to generate a standalone | |
385 | ;; effective-method function and call it from each of the method entries, | |
386 | ;; or to inline the effective method body into each of the entries. | |
387 | ;; | |
388 | ;; Most of the complexity here comes from (a) dealing with the two | |
389 | ;; different strategies for constructing method entry functions and (b) | |
390 | ;; (unsurprisingly) the mess involved with dealing with varargs messages. | |
391 | ||
392 | (let* ((message (effective-method-message method)) | |
393 | (class (effective-method-class method)) | |
394 | (message-class (sod-message-class message)) | |
395 | (return-type (c-type-subtype (sod-message-type message))) | |
396 | (codegen (make-instance 'method-codegen | |
397 | :message message | |
398 | :class class | |
399 | :method method)) | |
400 | ||
1f1d88f5 MW |
401 | ;; Method entry details. |
402 | (chain-tails (remove-if-not (lambda (super) | |
403 | (sod-subclass-p super message-class)) | |
404 | (mapcar #'car | |
405 | (sod-class-chains class)))) | |
406 | (n-entries (length chain-tails)) | |
bf8aadd7 MW |
407 | (raw-entry-args (sod-message-argument-tail message)) |
408 | (entry-args (sod-message-no-varargs-tail message)) | |
409 | (parm-n (let ((tail (last raw-entry-args 2))) | |
7deed8c9 | 410 | (and tail (eq (cadr tail) :ellipsis) (car tail)))) |
3dc0dd23 MW |
411 | (entry-target (codegen-target codegen)) |
412 | ||
413 | ;; Effective method function details. | |
414 | (emf-name (effective-method-function-name method)) | |
415 | (ilayout-type (c-type (* (struct (ilayout-struct-tag class))))) | |
3dc0dd23 MW |
416 | (emf-type (c-type (fun (lisp return-type) |
417 | ("sod__obj" (lisp ilayout-type)) | |
3aab0efa | 418 | . entry-args)))) |
1f1d88f5 | 419 | |
dea4d055 MW |
420 | (flet ((setup-entry (tail) |
421 | (let ((head (sod-class-chain-head tail))) | |
422 | (codegen-push codegen) | |
423 | (ensure-var codegen "sod__obj" ilayout-type | |
424 | (make-convert-to-ilayout-inst class | |
425 | head "me")))) | |
dea4d055 MW |
426 | (finish-entry (tail) |
427 | (let* ((head (sod-class-chain-head tail)) | |
bf8aadd7 MW |
428 | (role (if parm-n :valist nil)) |
429 | (name (method-entry-function-name method head role)) | |
dea4d055 MW |
430 | (type (c-type (fun (lisp return-type) |
431 | ("me" (* (class tail))) | |
432 | . entry-args)))) | |
7de8c666 MW |
433 | (codegen-pop-function codegen name type |
434 | "~@(~@[~A ~]entry~) function ~:_~ | |
435 | for method `~A.~A' ~:_~ | |
436 | via chain headed by `~A' ~:_~ | |
437 | defined on `~A'." | |
438 | (if parm-n "Indirect argument-tail" nil) | |
439 | (sod-class-nickname message-class) | |
440 | (sod-message-name message) | |
441 | head class) | |
bf8aadd7 MW |
442 | |
443 | ;; If this is a varargs method then we've made the | |
444 | ;; `:valist' role. Also make the `nil' role. | |
445 | (when parm-n | |
167524b5 MW |
446 | (let ((call (apply #'make-call-inst name "me" |
447 | (mapcar #'argument-name entry-args))) | |
bf8aadd7 MW |
448 | (main (method-entry-function-name method head nil)) |
449 | (main-type (c-type (fun (lisp return-type) | |
450 | ("me" (* (class tail))) | |
451 | . raw-entry-args)))) | |
452 | (codegen-push codegen) | |
e85df3ff | 453 | (ensure-var codegen *sod-ap* c-type-va-list) |
bf8aadd7 MW |
454 | (convert-stmts codegen entry-target return-type |
455 | (lambda (target) | |
b492babc MW |
456 | (deliver-call codegen :void "va_start" |
457 | *sod-ap* parm-n) | |
df9b9a63 | 458 | (deliver-expr codegen target call) |
b492babc MW |
459 | (deliver-call codegen :void "va_end" |
460 | *sod-ap*))) | |
7de8c666 MW |
461 | (codegen-pop-function codegen main main-type |
462 | "Variable-length argument list ~:_~ | |
463 | entry function ~:_~ | |
464 | for method `~A.~A' ~:_~ | |
465 | via chain headed by `~A' ~:_~ | |
466 | defined on `~A'." | |
467 | (sod-class-nickname message-class) | |
468 | (sod-message-name message) | |
469 | head class)))))) | |
1f1d88f5 MW |
470 | |
471 | ;; Generate the method body. We'll work out what to do with it later. | |
472 | (codegen-push codegen) | |
4e561d89 | 473 | (let* ((result (if (eq return-type c-type-void) nil |
9ec578d9 MW |
474 | (temporary-var codegen return-type))) |
475 | (emf-target (or result :void))) | |
476 | (compute-effective-method-body method codegen emf-target) | |
477 | (multiple-value-bind (vars insts) (codegen-pop codegen) | |
478 | (cond ((or (= n-entries 1) | |
479 | (<= (* n-entries (reduce #'+ insts :key #'inst-metric)) | |
480 | *method-entry-inline-threshold*)) | |
481 | ||
482 | ;; The effective method body is simple -- or there's only | |
483 | ;; one of them. We'll inline the method body into the entry | |
484 | ;; functions. | |
1f1d88f5 MW |
485 | (dolist (tail chain-tails) |
486 | (setup-entry tail) | |
9ec578d9 | 487 | (dolist (var vars) |
66836e14 MW |
488 | (if (typep var 'var-inst) |
489 | (ensure-var codegen (inst-name var) | |
490 | (inst-type var) (inst-init var)) | |
491 | (emit-decl codegen var))) | |
9ec578d9 | 492 | (emit-insts codegen insts) |
9ec578d9 MW |
493 | (deliver-expr codegen entry-target result) |
494 | (finish-entry tail))) | |
495 | ||
496 | (t | |
497 | ||
498 | ;; The effective method body is complicated and we'd need | |
499 | ;; more than one copy. We'll generate an effective method | |
500 | ;; function and call it a lot. | |
501 | (codegen-build-function codegen emf-name emf-type vars | |
502 | (nconc insts (and result | |
7de8c666 MW |
503 | (list (make-return-inst result)))) |
504 | "Effective method function ~:_for `~A.~A' ~:_~ | |
505 | defined on `~A'." | |
506 | (sod-class-nickname message-class) | |
507 | (sod-message-name message) | |
508 | (effective-method-class method)) | |
9ec578d9 | 509 | |
167524b5 | 510 | (let ((call (apply #'make-call-inst emf-name "sod__obj" |
3aab0efa | 511 | (mapcar #'argument-name entry-args)))) |
9ec578d9 MW |
512 | (dolist (tail chain-tails) |
513 | (setup-entry tail) | |
bf8aadd7 | 514 | (deliver-expr codegen entry-target call) |
9ec578d9 | 515 | (finish-entry tail))))))) |
1f1d88f5 MW |
516 | |
517 | (codegen-functions codegen)))) | |
518 | ||
dea4d055 MW |
519 | (defmethod compute-method-entry-functions |
520 | ((method simple-effective-method)) | |
521 | (if (effective-method-primary-methods method) | |
522 | (call-next-method) | |
523 | nil)) | |
524 | ||
525 | (defmethod compute-effective-method-body | |
526 | ((method simple-effective-method) codegen target) | |
599fe2c7 MW |
527 | (basic-effective-method-body codegen target method |
528 | (lambda (target) | |
529 | (simple-method-body method | |
530 | codegen | |
531 | target)))) | |
1f1d88f5 | 532 | |
dea4d055 MW |
533 | ;;;-------------------------------------------------------------------------- |
534 | ;;; Standard method combination. | |
ddee4bb1 | 535 | |
dea4d055 MW |
536 | (export 'standard-message) |
537 | (defclass standard-message (simple-message) | |
538 | () | |
539 | (:documentation | |
1a93d254 | 540 | "Message class for standard method combinations. |
1f1d88f5 | 541 | |
dea4d055 MW |
542 | Standard method combination is a simple method combination where the |
543 | primary methods are invoked as a delegation chain, from most- to | |
544 | least-specific.")) | |
545 | ||
546 | (export 'standard-effective-method) | |
547 | (defclass standard-effective-method (simple-effective-method) () | |
548 | (:documentation "Effective method counterpart to `standard-message'.")) | |
549 | ||
550 | (defmethod primary-method-class ((message standard-message)) | |
551 | 'delegating-direct-method) | |
552 | ||
7f2917d2 | 553 | (defmethod sod-message-effective-method-class ((message standard-message)) |
dea4d055 MW |
554 | 'standard-effective-method) |
555 | ||
556 | (defmethod simple-method-body | |
557 | ((method standard-effective-method) codegen target) | |
558 | (invoke-delegation-chain codegen | |
559 | target | |
560 | (effective-method-basic-argument-names method) | |
561 | (effective-method-primary-methods method) | |
562 | nil)) | |
a07d8d00 | 563 | |
1f1d88f5 | 564 | ;;;----- That's all, folks -------------------------------------------------- |