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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 | 100 | |
d7e47285 MW |
101 | (defmethod primary-method-class ((message simple-message)) |
102 | 'basic-direct-method) | |
103 | ||
1f1d88f5 MW |
104 | ;;;-------------------------------------------------------------------------- |
105 | ;;; Direct method classes. | |
106 | ||
dea4d055 | 107 | (export 'basic-direct-method) |
1f1d88f5 | 108 | (defclass basic-direct-method (sod-method) |
77027cca MW |
109 | ((role :initarg :role :type symbol :reader sod-method-role) |
110 | (function-type :type c-function-type :reader sod-method-function-type)) | |
1f1d88f5 MW |
111 | (:documentation |
112 | "Base class for built-in direct method classes. | |
113 | ||
114 | Provides the basic functionality for the built-in direct-method classes. | |
115 | This is a separate class so that `special effect' methods can avoid | |
116 | inheriting its default behaviour and slots. | |
117 | ||
118 | A basic method can be assigned a `role', which may be set either as an | |
dea4d055 | 119 | initarg or using the `:role' property. Roles are used for method |
1f1d88f5 MW |
120 | categorization. |
121 | ||
dea4d055 | 122 | The function type protocol is implemented on `basic-direct-method' using |
1f1d88f5 | 123 | slot reader methods. The actual values are computed on demand in methods |
dea4d055 | 124 | defined on `slot-unbound'.")) |
1f1d88f5 MW |
125 | |
126 | (defmethod shared-initialize :after | |
127 | ((method basic-direct-method) slot-names &key pset) | |
128 | (declare (ignore slot-names)) | |
129 | (default-slot (method 'role) (get-property pset :role :keyword nil))) | |
130 | ||
131 | (defmethod slot-unbound | |
132 | (class (method basic-direct-method) (slot-name (eql 'function-type))) | |
1d8cc67a | 133 | (declare (ignore class)) |
1f1d88f5 MW |
134 | (let ((type (sod-method-type method))) |
135 | (setf (slot-value method 'function-type) | |
136 | (c-type (fun (lisp (c-type-subtype type)) | |
137 | ("me" (* (class (sod-method-class method)))) | |
138 | . (c-function-arguments type)))))) | |
139 | ||
ddee4bb1 | 140 | (defmethod sod-method-function-name ((method basic-direct-method)) |
1f1d88f5 MW |
141 | (with-slots (class role message) method |
142 | (format nil "~A__~@[~(~A~)_~]method_~A__~A" class role | |
143 | (sod-class-nickname (sod-message-class message)) | |
144 | (sod-message-name message)))) | |
145 | ||
dea4d055 | 146 | (export 'daemon-direct-method) |
1f1d88f5 MW |
147 | (defclass daemon-direct-method (basic-direct-method) |
148 | () | |
149 | (:documentation | |
150 | "A daemon direct method is invoked for side effects and cannot override. | |
151 | ||
152 | This is the direct method class for `before' and `after' methods, which | |
153 | cannot choose to override the remaining methods and are not involved in | |
154 | the computation of the final result. | |
155 | ||
156 | In C terms, a daemon method must return `void', and is not passed a | |
157 | `next_method' pointer.")) | |
158 | ||
dea4d055 MW |
159 | (defmethod check-method-type ((method daemon-direct-method) |
160 | (message sod-message) | |
161 | (type c-function-type)) | |
1f1d88f5 MW |
162 | (with-slots ((msgtype type)) message |
163 | (unless (c-type-equal-p (c-type-subtype type) (c-type void)) | |
164 | (error "Method return type ~A must be `void'" (c-type-subtype type))) | |
165 | (unless (argument-lists-compatible-p (c-function-arguments msgtype) | |
166 | (c-function-arguments type)) | |
167 | (error "Method arguments ~A don't match message ~A" type msgtype)))) | |
168 | ||
dea4d055 | 169 | (export 'delegating-direct-method) |
1f1d88f5 MW |
170 | (defclass delegating-direct-method (basic-direct-method) |
171 | ((next-method-type :type c-function-type | |
172 | :reader sod-method-next-method-type)) | |
173 | (:documentation | |
174 | "A delegating direct method can choose to override other methods. | |
175 | ||
176 | This is the direct method class for `around' and standard-method- | |
177 | combination primary methods, which are given the choice of computing the | |
178 | entire method's result or delegating to (usually) less-specific methods. | |
179 | ||
180 | In C terms, a delegating method is passed a `next_method' pointer so that | |
181 | it can delegate part of its behaviour. (A delegating direct method for a | |
182 | varargs message is also given an additional `va_list' argument, | |
183 | conventionally named `sod__ap_master', which it is expected to pass on to | |
184 | its `next_method' function if necessary.) | |
185 | ||
bf090e02 | 186 | The function type protocol is implemented on `delegating-direct-method' |
1f1d88f5 | 187 | using slot reader methods. The actual values are computed on demand in |
bf090e02 | 188 | methods defined on `slot-unbound'.")) |
1f1d88f5 MW |
189 | |
190 | (defmethod slot-unbound (class | |
191 | (method delegating-direct-method) | |
192 | (slot-name (eql 'next-method-type))) | |
1d8cc67a | 193 | (declare (ignore class)) |
1f1d88f5 | 194 | (let* ((message (sod-method-message method)) |
e5fae432 MW |
195 | (return-type (c-type-subtype (sod-message-type message))) |
196 | (msgargs (sod-message-argument-tail message)) | |
197 | (arguments (if (varargs-message-p message) | |
198 | (cons (make-argument *sod-master-ap* | |
199 | (c-type va-list)) | |
200 | (butlast msgargs)) | |
201 | msgargs))) | |
1f1d88f5 | 202 | (setf (slot-value method 'next-method-type) |
e5fae432 | 203 | (c-type (fun (lisp return-type) |
1f1d88f5 | 204 | ("me" (* (class (sod-method-class method)))) |
e5fae432 | 205 | . arguments))))) |
1f1d88f5 MW |
206 | |
207 | (defmethod slot-unbound (class | |
208 | (method delegating-direct-method) | |
209 | (slot-name (eql 'function-type))) | |
1d8cc67a | 210 | (declare (ignore class)) |
1f1d88f5 MW |
211 | (let* ((message (sod-method-message method)) |
212 | (type (sod-method-type method)) | |
213 | (method-args (c-function-arguments type))) | |
214 | (setf (slot-value method 'function-type) | |
215 | (c-type (fun (lisp (c-type-subtype type)) | |
216 | ("me" (* (class (sod-method-class method)))) | |
217 | ("next_method" (* (lisp (commentify-function-type | |
218 | (sod-method-next-method-type | |
219 | method))))) | |
bf090e02 MW |
220 | . |
221 | (if (varargs-message-p message) | |
222 | (cons (make-argument *sod-master-ap* | |
223 | (c-type va-list)) | |
224 | method-args) | |
225 | method-args)))))) | |
1f1d88f5 MW |
226 | |
227 | ;;;-------------------------------------------------------------------------- | |
228 | ;;; Effective method classes. | |
229 | ||
dea4d055 | 230 | (export 'basic-effective-method) |
1f1d88f5 | 231 | (defclass basic-effective-method (effective-method) |
77027cca MW |
232 | ((around-methods :initarg :around-methods :initform nil |
233 | :type list :reader effective-method-around-methods) | |
234 | (before-methods :initarg :before-methods :initform nil | |
235 | :type list :reader effective-method-before-methods) | |
236 | (after-methods :initarg :after-methods :initform nil | |
237 | :type list :reader effective-method-after-methods) | |
1f1d88f5 MW |
238 | (basic-argument-names :type list |
239 | :reader effective-method-basic-argument-names) | |
240 | (functions :type list :reader effective-method-functions)) | |
241 | (:documentation | |
242 | "Base class for built-in effective method classes. | |
243 | ||
244 | This class maintains lists of the applicable `before', `after' and | |
245 | `around' methods and provides behaviour for invoking these methods | |
246 | correctly. | |
247 | ||
dea4d055 MW |
248 | The argument names protocol is implemented on `basic-effective-method' |
249 | using a slot reader method. The actual values are computed on demand in | |
250 | methods defined on `slot-unbound'.")) | |
1f1d88f5 MW |
251 | |
252 | (defmethod slot-unbound (class | |
253 | (method basic-effective-method) | |
254 | (slot-name (eql 'basic-argument-names))) | |
1d8cc67a | 255 | (declare (ignore class)) |
1f1d88f5 MW |
256 | (let ((message (effective-method-message method))) |
257 | (setf (slot-value method 'basic-argument-names) | |
4c3d168f MW |
258 | (mapcar #'argument-name |
259 | (sod-message-no-varargs-tail message))))) | |
1f1d88f5 | 260 | |
dea4d055 MW |
261 | (defmethod effective-method-function-name ((method effective-method)) |
262 | (let* ((class (effective-method-class method)) | |
263 | (message (effective-method-message method)) | |
264 | (message-class (sod-message-class message))) | |
265 | (format nil "~A__emethod_~A__~A" | |
266 | class | |
267 | (sod-class-nickname message-class) | |
268 | (sod-message-name message)))) | |
1f1d88f5 | 269 | |
dea4d055 MW |
270 | (defmethod slot-unbound |
271 | (class (method basic-effective-method) (slot-name (eql 'functions))) | |
1d8cc67a | 272 | (declare (ignore class)) |
dea4d055 MW |
273 | (setf (slot-value method 'functions) |
274 | (compute-method-entry-functions method))) | |
1f1d88f5 | 275 | |
dea4d055 MW |
276 | (export 'simple-effective-method) |
277 | (defclass simple-effective-method (basic-effective-method) | |
278 | ((primary-methods :initarg :primary-methods :initform nil | |
279 | :type list :reader effective-method-primary-methods)) | |
1f1d88f5 | 280 | (:documentation |
dea4d055 | 281 | "Effective method counterpart to `simple-message'.")) |
1f1d88f5 | 282 | |
dea4d055 MW |
283 | (defmethod shared-initialize :after |
284 | ((method simple-effective-method) slot-names &key direct-methods) | |
285 | (declare (ignore slot-names)) | |
286 | (categorize (method direct-methods :bind ((role (sod-method-role method)))) | |
287 | ((primary (null role)) | |
288 | (before (eq role :before)) | |
289 | (after (eq role :after)) | |
290 | (around (eq role :around))) | |
291 | (with-slots (primary-methods before-methods after-methods around-methods) | |
292 | method | |
293 | (setf primary-methods primary | |
294 | before-methods before | |
295 | after-methods (reverse after) | |
296 | around-methods around)))) | |
297 | ||
298 | ;;;-------------------------------------------------------------------------- | |
299 | ;;; Code generation. | |
1f1d88f5 MW |
300 | |
301 | (defmethod shared-initialize :after | |
302 | ((codegen method-codegen) slot-names &key) | |
1d8cc67a | 303 | (declare (ignore slot-names)) |
1f1d88f5 MW |
304 | (with-slots (message target) codegen |
305 | (setf target | |
306 | (if (eq (c-type-subtype (sod-message-type message)) (c-type void)) | |
307 | :void | |
308 | :return)))) | |
309 | ||
dea4d055 MW |
310 | ;;;-------------------------------------------------------------------------- |
311 | ;;; Invoking direct methods. | |
1f1d88f5 | 312 | |
dea4d055 | 313 | (export 'basic-effective-method-body) |
1f1d88f5 MW |
314 | (defun basic-effective-method-body (codegen target method body) |
315 | "Build the common method-invocation structure. | |
316 | ||
317 | Writes to CODEGEN some basic method-invocation instructions. It invokes | |
318 | the `around' methods, from most- to least-specific. If they all delegate, | |
319 | then the `before' methods are run, most-specific first; next, the | |
320 | instructions generated by BODY (invoked with a target argument); then, the | |
321 | `after' methods are run, least-specific first; and, finally, the value | |
322 | delivered by the BODY is returned to the `around' methods. The result | |
323 | returned by the outermost `around' method -- or, if there are none, | |
324 | delivered by the BODY -- is finally delivered to the TARGET." | |
325 | ||
326 | (with-slots (message class before-methods after-methods around-methods) | |
327 | method | |
328 | (let* ((message-type (sod-message-type message)) | |
329 | (return-type (c-type-subtype message-type)) | |
1f1d88f5 MW |
330 | (basic-tail (effective-method-basic-argument-names method))) |
331 | (flet ((method-kernel (target) | |
332 | (dolist (before before-methods) | |
333 | (invoke-method codegen :void basic-tail before)) | |
cb35f25e | 334 | (if (null after-methods) |
1f1d88f5 MW |
335 | (funcall body target) |
336 | (convert-stmts codegen target return-type | |
337 | (lambda (target) | |
338 | (funcall body target) | |
339 | (dolist (after (reverse after-methods)) | |
340 | (invoke-method codegen :void | |
a898c9e2 | 341 | basic-tail after))))))) |
1f1d88f5 MW |
342 | (invoke-delegation-chain codegen target basic-tail |
343 | around-methods #'method-kernel))))) | |
344 | ||
345 | ;;;-------------------------------------------------------------------------- | |
dea4d055 | 346 | ;;; Method entry points. |
1f1d88f5 | 347 | |
a07d8d00 | 348 | (defparameter *method-entry-inline-threshold* 200 |
1f1d88f5 MW |
349 | "Threshold below which effective method bodies are inlined into entries. |
350 | ||
351 | After the effective method body has been computed, we calculate its | |
352 | metric, multiply by the number of entries we need to generate, and compare | |
353 | it with this threshold. If the metric is below the threshold then we | |
354 | fold the method body into the entry functions; otherwise we split the | |
355 | effective method out into its own function.") | |
356 | ||
1f1d88f5 | 357 | (defmethod method-entry-function-name |
b426ab51 | 358 | ((method effective-method) (chain-head sod-class) role) |
1f1d88f5 MW |
359 | (let* ((class (effective-method-class method)) |
360 | (message (effective-method-message method)) | |
361 | (message-class (sod-message-class message))) | |
dea4d055 MW |
362 | (if (or (not (slot-boundp method 'functions)) |
363 | (slot-value method 'functions)) | |
b426ab51 MW |
364 | (format nil "~A__mentry~@[__~(~A~)~]_~A__~A__chain_~A" |
365 | class role | |
dea4d055 MW |
366 | (sod-class-nickname message-class) |
367 | (sod-message-name message) | |
368 | (sod-class-nickname chain-head)) | |
369 | 0))) | |
370 | ||
b426ab51 MW |
371 | (defmethod method-entry-slot-name ((entry method-entry)) |
372 | (let* ((method (method-entry-effective-method entry)) | |
373 | (message (effective-method-message method)) | |
374 | (name (sod-message-name message)) | |
375 | (role (method-entry-role entry))) | |
376 | (method-entry-slot-name-by-role entry role name))) | |
377 | ||
dea4d055 MW |
378 | (defmethod method-entry-function-type ((entry method-entry)) |
379 | (let* ((method (method-entry-effective-method entry)) | |
380 | (message (effective-method-message method)) | |
b426ab51 MW |
381 | (type (sod-message-type message)) |
382 | (tail (ecase (method-entry-role entry) | |
bf8aadd7 MW |
383 | ((nil) (sod-message-argument-tail message)) |
384 | (:valist (sod-message-no-varargs-tail message))))) | |
dea4d055 MW |
385 | (c-type (fun (lisp (c-type-subtype type)) |
386 | ("me" (* (class (method-entry-chain-tail entry)))) | |
b426ab51 MW |
387 | . tail)))) |
388 | ||
389 | (defmethod make-method-entries ((method basic-effective-method) | |
390 | (chain-head sod-class) | |
391 | (chain-tail sod-class)) | |
392 | (let ((entries nil) | |
393 | (message (effective-method-message method))) | |
394 | (flet ((make (role) | |
395 | (push (make-instance 'method-entry | |
396 | :method method :role role | |
397 | :chain-head chain-head | |
398 | :chain-tail chain-tail) | |
399 | entries))) | |
bf8aadd7 | 400 | (when (varargs-message-p message) (make :valist)) |
b426ab51 MW |
401 | (make nil) |
402 | entries))) | |
1f1d88f5 MW |
403 | |
404 | (defmethod compute-method-entry-functions ((method basic-effective-method)) | |
405 | ||
406 | ;; OK, there's quite a lot of this, so hold tight. | |
407 | ;; | |
408 | ;; The first thing we need to do is find all of the related objects. This | |
409 | ;; is a bit verbose but fairly straightforward. | |
410 | ;; | |
bf090e02 MW |
411 | ;; Next, we generate the effective method body -- using `compute-effective- |
412 | ;; method-body' of all things. This gives us the declarations and body for | |
1f1d88f5 MW |
413 | ;; an effective method function, but we don't have an actual function yet. |
414 | ;; | |
415 | ;; Now we look at the chains which are actually going to need a method | |
416 | ;; entry: only those chains whose tail (most specific) class is a | |
417 | ;; superclass of the class which defined the message need an entry. We | |
418 | ;; build a list of these tail classes. | |
419 | ;; | |
420 | ;; Having done this, we decide whether it's better to generate a standalone | |
421 | ;; effective-method function and call it from each of the method entries, | |
422 | ;; or to inline the effective method body into each of the entries. | |
423 | ;; | |
424 | ;; Most of the complexity here comes from (a) dealing with the two | |
425 | ;; different strategies for constructing method entry functions and (b) | |
426 | ;; (unsurprisingly) the mess involved with dealing with varargs messages. | |
427 | ||
428 | (let* ((message (effective-method-message method)) | |
429 | (class (effective-method-class method)) | |
430 | (message-class (sod-message-class message)) | |
431 | (return-type (c-type-subtype (sod-message-type message))) | |
432 | (codegen (make-instance 'method-codegen | |
433 | :message message | |
434 | :class class | |
435 | :method method)) | |
436 | ||
1f1d88f5 MW |
437 | ;; Method entry details. |
438 | (chain-tails (remove-if-not (lambda (super) | |
439 | (sod-subclass-p super message-class)) | |
440 | (mapcar #'car | |
441 | (sod-class-chains class)))) | |
442 | (n-entries (length chain-tails)) | |
bf8aadd7 MW |
443 | (raw-entry-args (sod-message-argument-tail message)) |
444 | (entry-args (sod-message-no-varargs-tail message)) | |
445 | (parm-n (let ((tail (last raw-entry-args 2))) | |
7deed8c9 | 446 | (and tail (eq (cadr tail) :ellipsis) (car tail)))) |
3dc0dd23 MW |
447 | (entry-target (codegen-target codegen)) |
448 | ||
449 | ;; Effective method function details. | |
450 | (emf-name (effective-method-function-name method)) | |
451 | (ilayout-type (c-type (* (struct (ilayout-struct-tag class))))) | |
452 | (emf-arg-tail (sod-message-no-varargs-tail message)) | |
453 | (emf-type (c-type (fun (lisp return-type) | |
454 | ("sod__obj" (lisp ilayout-type)) | |
455 | . emf-arg-tail)))) | |
1f1d88f5 | 456 | |
dea4d055 MW |
457 | (flet ((setup-entry (tail) |
458 | (let ((head (sod-class-chain-head tail))) | |
459 | (codegen-push codegen) | |
460 | (ensure-var codegen "sod__obj" ilayout-type | |
461 | (make-convert-to-ilayout-inst class | |
462 | head "me")))) | |
dea4d055 MW |
463 | (finish-entry (tail) |
464 | (let* ((head (sod-class-chain-head tail)) | |
bf8aadd7 MW |
465 | (role (if parm-n :valist nil)) |
466 | (name (method-entry-function-name method head role)) | |
dea4d055 MW |
467 | (type (c-type (fun (lisp return-type) |
468 | ("me" (* (class tail))) | |
469 | . entry-args)))) | |
bf8aadd7 MW |
470 | (codegen-pop-function codegen name type) |
471 | ||
472 | ;; If this is a varargs method then we've made the | |
473 | ;; `:valist' role. Also make the `nil' role. | |
474 | (when parm-n | |
475 | (let ((call (make-call-inst name | |
476 | (cons "me" | |
477 | (mapcar #'argument-name | |
478 | entry-args)))) | |
479 | (main (method-entry-function-name method head nil)) | |
480 | (main-type (c-type (fun (lisp return-type) | |
481 | ("me" (* (class tail))) | |
482 | . raw-entry-args)))) | |
483 | (codegen-push codegen) | |
484 | (ensure-var codegen *sod-ap* (c-type va-list)) | |
485 | (emit-inst codegen | |
486 | (make-va-start-inst *sod-ap* | |
487 | (argument-name parm-n))) | |
488 | (convert-stmts codegen entry-target return-type | |
489 | (lambda (target) | |
490 | (deliver-expr codegen target call))) | |
491 | (emit-inst codegen (make-va-end-inst *sod-ap*)) | |
492 | (codegen-pop-function codegen main main-type)))))) | |
1f1d88f5 MW |
493 | |
494 | ;; Generate the method body. We'll work out what to do with it later. | |
495 | (codegen-push codegen) | |
4e561d89 | 496 | (let* ((result (if (eq return-type c-type-void) nil |
9ec578d9 MW |
497 | (temporary-var codegen return-type))) |
498 | (emf-target (or result :void))) | |
499 | (compute-effective-method-body method codegen emf-target) | |
500 | (multiple-value-bind (vars insts) (codegen-pop codegen) | |
501 | (cond ((or (= n-entries 1) | |
502 | (<= (* n-entries (reduce #'+ insts :key #'inst-metric)) | |
503 | *method-entry-inline-threshold*)) | |
504 | ||
505 | ;; The effective method body is simple -- or there's only | |
506 | ;; one of them. We'll inline the method body into the entry | |
507 | ;; functions. | |
1f1d88f5 MW |
508 | (dolist (tail chain-tails) |
509 | (setup-entry tail) | |
9ec578d9 | 510 | (dolist (var vars) |
66836e14 MW |
511 | (if (typep var 'var-inst) |
512 | (ensure-var codegen (inst-name var) | |
513 | (inst-type var) (inst-init var)) | |
514 | (emit-decl codegen var))) | |
9ec578d9 | 515 | (emit-insts codegen insts) |
9ec578d9 MW |
516 | (deliver-expr codegen entry-target result) |
517 | (finish-entry tail))) | |
518 | ||
519 | (t | |
520 | ||
521 | ;; The effective method body is complicated and we'd need | |
522 | ;; more than one copy. We'll generate an effective method | |
523 | ;; function and call it a lot. | |
524 | (codegen-build-function codegen emf-name emf-type vars | |
525 | (nconc insts (and result | |
526 | (list (make-return-inst result))))) | |
527 | ||
528 | (let ((call (make-call-inst emf-name | |
529 | (cons "sod__obj" (mapcar #'argument-name | |
530 | emf-arg-tail))))) | |
531 | (dolist (tail chain-tails) | |
532 | (setup-entry tail) | |
bf8aadd7 | 533 | (deliver-expr codegen entry-target call) |
9ec578d9 | 534 | (finish-entry tail))))))) |
1f1d88f5 MW |
535 | |
536 | (codegen-functions codegen)))) | |
537 | ||
dea4d055 MW |
538 | (defmethod compute-method-entry-functions |
539 | ((method simple-effective-method)) | |
540 | (if (effective-method-primary-methods method) | |
541 | (call-next-method) | |
542 | nil)) | |
543 | ||
544 | (defmethod compute-effective-method-body | |
545 | ((method simple-effective-method) codegen target) | |
599fe2c7 MW |
546 | (basic-effective-method-body codegen target method |
547 | (lambda (target) | |
548 | (simple-method-body method | |
549 | codegen | |
550 | target)))) | |
1f1d88f5 | 551 | |
dea4d055 MW |
552 | ;;;-------------------------------------------------------------------------- |
553 | ;;; Standard method combination. | |
ddee4bb1 | 554 | |
dea4d055 MW |
555 | (export 'standard-message) |
556 | (defclass standard-message (simple-message) | |
557 | () | |
558 | (:documentation | |
1a93d254 | 559 | "Message class for standard method combinations. |
1f1d88f5 | 560 | |
dea4d055 MW |
561 | Standard method combination is a simple method combination where the |
562 | primary methods are invoked as a delegation chain, from most- to | |
563 | least-specific.")) | |
564 | ||
565 | (export 'standard-effective-method) | |
566 | (defclass standard-effective-method (simple-effective-method) () | |
567 | (:documentation "Effective method counterpart to `standard-message'.")) | |
568 | ||
569 | (defmethod primary-method-class ((message standard-message)) | |
570 | 'delegating-direct-method) | |
571 | ||
572 | (defmethod message-effective-method-class ((message standard-message)) | |
573 | 'standard-effective-method) | |
574 | ||
575 | (defmethod simple-method-body | |
576 | ((method standard-effective-method) codegen target) | |
577 | (invoke-delegation-chain codegen | |
578 | target | |
579 | (effective-method-basic-argument-names method) | |
580 | (effective-method-primary-methods method) | |
581 | nil)) | |
a07d8d00 | 582 | |
1f1d88f5 | 583 | ;;;----- That's all, folks -------------------------------------------------- |