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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 | ||
1f1d88f5 MW |
28 | ;;;-------------------------------------------------------------------------- |
29 | ;;; Message classes. | |
30 | ||
dea4d055 | 31 | (export 'basic-message) |
1f1d88f5 | 32 | (defclass basic-message (sod-message) |
1622ed8e | 33 | ((argument-tail :type list :reader sod-message-argument-tail)) |
1f1d88f5 MW |
34 | (:documentation |
35 | "Base class for built-in message classes. | |
36 | ||
37 | Provides the basic functionality for the built-in method combinations. | |
38 | This is a separate class so that `special effect' messages can avoid | |
39 | inheriting its default behaviour. | |
40 | ||
dea4d055 | 41 | The function type protocol is implemented on `basic-message' using slot |
6e6b0958 | 42 | reader methods. The actual values are computed on demand.")) |
1f1d88f5 | 43 | |
6e6b0958 | 44 | (define-on-demand-slot basic-message argument-tail (message) |
1f1d88f5 | 45 | (let ((seq 0)) |
6e6b0958 MW |
46 | (mapcar (lambda (arg) |
47 | (if (or (eq arg :ellipsis) (argument-name arg)) arg | |
48 | (make-argument (make-instance 'temporary-argument | |
49 | :tag (prog1 seq | |
50 | (incf seq))) | |
51 | (argument-type arg)))) | |
52 | (c-function-arguments (sod-message-type message))))) | |
53 | ||
1f1d88f5 MW |
54 | (defmethod sod-message-method-class |
55 | ((message basic-message) (class sod-class) pset) | |
56 | (let ((role (get-property pset :role :keyword nil))) | |
57 | (case role | |
58 | ((:before :after) 'daemon-direct-method) | |
59 | (:around 'delegating-direct-method) | |
60 | ((nil) (error "How odd: a primary method slipped through the net")) | |
61 | (t (error "Unknown method role ~A" role))))) | |
62 | ||
dea4d055 MW |
63 | (export 'simple-message) |
64 | (defclass simple-message (basic-message) | |
65 | () | |
66 | (:documentation | |
67 | "Base class for messages with `simple' method combinations. | |
1f1d88f5 | 68 | |
dea4d055 | 69 | A simple method combination is one which has only one method role other |
3109662a MW |
70 | than the `before', `after' and `around' methods provided by |
71 | `basic-message'. We call these `primary' methods, and the programmer | |
72 | designates them by not specifying an explicit role. | |
1f1d88f5 | 73 | |
dea4d055 MW |
74 | If the programmer doesn't define any primary methods then the effective |
75 | method is null -- i.e., the method entry pointer shows up as a null | |
76 | pointer.")) | |
77 | ||
78 | (defmethod sod-message-method-class | |
79 | ((message simple-message) (class sod-class) pset) | |
80 | (if (get-property pset :role :keyword nil) | |
81 | (call-next-method) | |
82 | (primary-method-class message))) | |
1f1d88f5 | 83 | |
d7e47285 MW |
84 | (defmethod primary-method-class ((message simple-message)) |
85 | 'basic-direct-method) | |
86 | ||
1f1d88f5 MW |
87 | ;;;-------------------------------------------------------------------------- |
88 | ;;; Direct method classes. | |
89 | ||
11e41ddf | 90 | (export '(basic-direct-method sod-method-role)) |
1f1d88f5 | 91 | (defclass basic-direct-method (sod-method) |
77027cca MW |
92 | ((role :initarg :role :type symbol :reader sod-method-role) |
93 | (function-type :type c-function-type :reader sod-method-function-type)) | |
1f1d88f5 MW |
94 | (:documentation |
95 | "Base class for built-in direct method classes. | |
96 | ||
97 | Provides the basic functionality for the built-in direct-method classes. | |
98 | This is a separate class so that `special effect' methods can avoid | |
99 | inheriting its default behaviour and slots. | |
100 | ||
101 | A basic method can be assigned a `role', which may be set either as an | |
dea4d055 | 102 | initarg or using the `:role' property. Roles are used for method |
1f1d88f5 MW |
103 | categorization. |
104 | ||
dea4d055 | 105 | The function type protocol is implemented on `basic-direct-method' using |
6e6b0958 | 106 | slot reader methods.")) |
1f1d88f5 MW |
107 | |
108 | (defmethod shared-initialize :after | |
109 | ((method basic-direct-method) slot-names &key pset) | |
110 | (declare (ignore slot-names)) | |
111 | (default-slot (method 'role) (get-property pset :role :keyword nil))) | |
112 | ||
43073476 MW |
113 | (defun direct-method-suppliedp-struct-tag (direct-method) |
114 | (with-slots ((class %class) role message) direct-method | |
115 | (format nil "~A__~@[~(~A~)_~]suppliedp_~A__~A" | |
116 | class role | |
117 | (sod-class-nickname (sod-message-class message)) | |
118 | (sod-message-name message)))) | |
119 | ||
120 | (defun effective-method-keyword-struct-tag (effective-method) | |
121 | (with-slots ((class %class) message) effective-method | |
122 | (format nil "~A__keywords_~A__~A" | |
123 | class | |
124 | (sod-class-nickname (sod-message-class message)) | |
125 | (sod-message-name message)))) | |
126 | ||
127 | (defun fix-up-keyword-method-args (method args) | |
128 | "Adjust the ARGS to include METHOD's `suppliedp' and keyword arguments. | |
129 | ||
130 | Return the adjusted list. The `suppliedp' argument, if any, is prepended | |
131 | to the list; the keyword arguments are added to the end. | |
132 | ||
133 | (The input ARGS list is not actually modified.)" | |
134 | (let* ((type (sod-method-type method)) | |
135 | (keys (c-function-keywords type)) | |
136 | (tag (direct-method-suppliedp-struct-tag method))) | |
137 | (append (and keys | |
138 | (list (make-argument "suppliedp" (c-type (struct tag))))) | |
139 | args | |
140 | (mapcar (lambda (key) | |
141 | (make-argument (argument-name key) | |
142 | (argument-type key))) | |
143 | keys)))) | |
144 | ||
6e6b0958 | 145 | (define-on-demand-slot basic-direct-method function-type (method) |
43073476 MW |
146 | (let* ((message (sod-method-message method)) |
147 | (type (sod-method-type method)) | |
148 | (method-args (c-function-arguments type))) | |
149 | (when (keyword-message-p message) | |
150 | (setf method-args (fix-up-keyword-method-args method method-args))) | |
6e6b0958 MW |
151 | (c-type (fun (lisp (c-type-subtype type)) |
152 | ("me" (* (class (sod-method-class method)))) | |
43073476 | 153 | . method-args)))) |
1f1d88f5 | 154 | |
675b4824 MW |
155 | (defmethod sod-method-description ((method basic-direct-method)) |
156 | (with-slots (role) method | |
157 | (if role (string-downcase role) | |
158 | "primary"))) | |
159 | ||
ddee4bb1 | 160 | (defmethod sod-method-function-name ((method basic-direct-method)) |
4b8e5c03 | 161 | (with-slots ((class %class) role message) method |
1f1d88f5 MW |
162 | (format nil "~A__~@[~(~A~)_~]method_~A__~A" class role |
163 | (sod-class-nickname (sod-message-class message)) | |
164 | (sod-message-name message)))) | |
165 | ||
dea4d055 | 166 | (export 'daemon-direct-method) |
1f1d88f5 MW |
167 | (defclass daemon-direct-method (basic-direct-method) |
168 | () | |
169 | (:documentation | |
170 | "A daemon direct method is invoked for side effects and cannot override. | |
171 | ||
172 | This is the direct method class for `before' and `after' methods, which | |
173 | cannot choose to override the remaining methods and are not involved in | |
174 | the computation of the final result. | |
175 | ||
176 | In C terms, a daemon method must return `void', and is not passed a | |
177 | `next_method' pointer.")) | |
178 | ||
dea4d055 MW |
179 | (defmethod check-method-type ((method daemon-direct-method) |
180 | (message sod-message) | |
181 | (type c-function-type)) | |
4b8e5c03 | 182 | (with-slots ((msgtype %type)) message |
b70cb6d8 MW |
183 | (check-method-return-type type c-type-void) |
184 | (check-method-argument-lists type msgtype))) | |
1f1d88f5 | 185 | |
dea4d055 | 186 | (export 'delegating-direct-method) |
1f1d88f5 MW |
187 | (defclass delegating-direct-method (basic-direct-method) |
188 | ((next-method-type :type c-function-type | |
189 | :reader sod-method-next-method-type)) | |
190 | (:documentation | |
191 | "A delegating direct method can choose to override other methods. | |
192 | ||
193 | This is the direct method class for `around' and standard-method- | |
194 | combination primary methods, which are given the choice of computing the | |
195 | entire method's result or delegating to (usually) less-specific methods. | |
196 | ||
197 | In C terms, a delegating method is passed a `next_method' pointer so that | |
198 | it can delegate part of its behaviour. (A delegating direct method for a | |
199 | varargs message is also given an additional `va_list' argument, | |
200 | conventionally named `sod__ap_master', which it is expected to pass on to | |
201 | its `next_method' function if necessary.) | |
202 | ||
bf090e02 | 203 | The function type protocol is implemented on `delegating-direct-method' |
6e6b0958 | 204 | using slot reader methods..")) |
1f1d88f5 | 205 | |
6e6b0958 | 206 | (define-on-demand-slot delegating-direct-method next-method-type (method) |
1f1d88f5 | 207 | (let* ((message (sod-method-message method)) |
e5fae432 MW |
208 | (return-type (c-type-subtype (sod-message-type message))) |
209 | (msgargs (sod-message-argument-tail message)) | |
43073476 MW |
210 | (arguments (cond ((varargs-message-p message) |
211 | (cons (make-argument *sod-master-ap* | |
212 | c-type-va-list) | |
213 | (butlast msgargs))) | |
214 | ((keyword-message-p message) | |
215 | (cons (make-argument *sod-keywords* | |
216 | (c-type (* (void :const)))) | |
217 | msgargs)) | |
218 | (t | |
219 | msgargs)))) | |
6e6b0958 MW |
220 | (c-type (fun (lisp return-type) |
221 | ("me" (* (class (sod-method-class method)))) | |
222 | . arguments)))) | |
223 | ||
224 | (define-on-demand-slot delegating-direct-method function-type (method) | |
1f1d88f5 MW |
225 | (let* ((message (sod-method-message method)) |
226 | (type (sod-method-type method)) | |
43073476 MW |
227 | (method-args (c-function-arguments type)) |
228 | (next-method-arg (make-argument | |
229 | "next_method" | |
230 | (make-pointer-type | |
231 | (commentify-function-type | |
232 | (sod-method-next-method-type method)))))) | |
233 | (cond ((varargs-message-p message) | |
234 | (push (make-argument *sod-master-ap* c-type-va-list) | |
235 | method-args) | |
236 | (push next-method-arg method-args)) | |
237 | ((keyword-message-p message) | |
238 | (push (make-argument *sod-keywords* (c-type (* (void :const)))) | |
239 | method-args) | |
240 | (push next-method-arg method-args) | |
241 | (setf method-args | |
242 | (fix-up-keyword-method-args method method-args))) | |
243 | (t | |
244 | (push next-method-arg method-args))) | |
6e6b0958 MW |
245 | (c-type (fun (lisp (c-type-subtype type)) |
246 | ("me" (* (class (sod-method-class method)))) | |
43073476 | 247 | . method-args)))) |
1f1d88f5 MW |
248 | |
249 | ;;;-------------------------------------------------------------------------- | |
250 | ;;; Effective method classes. | |
251 | ||
43ce48fd MW |
252 | (defmethod method-keyword-argument-lists |
253 | ((method effective-method) direct-methods) | |
254 | (with-slots (message) method | |
bdaf6dbd MW |
255 | (and (keyword-message-p message) |
256 | (mapcar (lambda (m) | |
b9966919 MW |
257 | (cons (c-function-keywords (sod-method-type m)) |
258 | (format nil "method for ~A on ~A (at ~A)" | |
259 | message | |
260 | (sod-method-class m) | |
261 | (file-location m)))) | |
bdaf6dbd | 262 | direct-methods)))) |
43ce48fd | 263 | |
43073476 MW |
264 | (defmethod shared-initialize :after |
265 | ((method effective-method) slot-names &key direct-methods) | |
266 | (declare (ignore slot-names)) | |
267 | ||
268 | ;; Set the keyword argument list. | |
269 | (with-slots (message keywords) method | |
43ce48fd MW |
270 | (setf keywords |
271 | (merge-keyword-lists (method-keyword-argument-lists | |
272 | method direct-methods))))) | |
43073476 | 273 | |
11e41ddf MW |
274 | (export '(basic-effective-method |
275 | effective-method-around-methods effective-method-before-methods | |
276 | effective-method-after-methods)) | |
1f1d88f5 | 277 | (defclass basic-effective-method (effective-method) |
77027cca MW |
278 | ((around-methods :initarg :around-methods :initform nil |
279 | :type list :reader effective-method-around-methods) | |
280 | (before-methods :initarg :before-methods :initform nil | |
281 | :type list :reader effective-method-before-methods) | |
282 | (after-methods :initarg :after-methods :initform nil | |
283 | :type list :reader effective-method-after-methods) | |
1f1d88f5 MW |
284 | (basic-argument-names :type list |
285 | :reader effective-method-basic-argument-names) | |
286 | (functions :type list :reader effective-method-functions)) | |
287 | (:documentation | |
288 | "Base class for built-in effective method classes. | |
289 | ||
290 | This class maintains lists of the applicable `before', `after' and | |
291 | `around' methods and provides behaviour for invoking these methods | |
292 | correctly. | |
293 | ||
dea4d055 | 294 | The argument names protocol is implemented on `basic-effective-method' |
6e6b0958 | 295 | using a slot reader method.")) |
1f1d88f5 | 296 | |
6e6b0958 | 297 | (define-on-demand-slot basic-effective-method basic-argument-names (method) |
1622ed8e MW |
298 | (let* ((message (effective-method-message method)) |
299 | (raw-tail (sod-message-argument-tail message))) | |
300 | (mapcar #'argument-name (reify-variable-argument-tail raw-tail)))) | |
1f1d88f5 | 301 | |
dea4d055 MW |
302 | (defmethod effective-method-function-name ((method effective-method)) |
303 | (let* ((class (effective-method-class method)) | |
304 | (message (effective-method-message method)) | |
305 | (message-class (sod-message-class message))) | |
306 | (format nil "~A__emethod_~A__~A" | |
307 | class | |
308 | (sod-class-nickname message-class) | |
309 | (sod-message-name message)))) | |
1f1d88f5 | 310 | |
6e6b0958 MW |
311 | (define-on-demand-slot basic-effective-method functions (method) |
312 | (compute-method-entry-functions method)) | |
1f1d88f5 | 313 | |
dea4d055 MW |
314 | (export 'simple-effective-method) |
315 | (defclass simple-effective-method (basic-effective-method) | |
316 | ((primary-methods :initarg :primary-methods :initform nil | |
317 | :type list :reader effective-method-primary-methods)) | |
1f1d88f5 | 318 | (:documentation |
dea4d055 | 319 | "Effective method counterpart to `simple-message'.")) |
1f1d88f5 | 320 | |
dea4d055 MW |
321 | (defmethod shared-initialize :after |
322 | ((method simple-effective-method) slot-names &key direct-methods) | |
323 | (declare (ignore slot-names)) | |
324 | (categorize (method direct-methods :bind ((role (sod-method-role method)))) | |
325 | ((primary (null role)) | |
326 | (before (eq role :before)) | |
327 | (after (eq role :after)) | |
328 | (around (eq role :around))) | |
329 | (with-slots (primary-methods before-methods after-methods around-methods) | |
330 | method | |
331 | (setf primary-methods primary | |
332 | before-methods before | |
333 | after-methods (reverse after) | |
334 | around-methods around)))) | |
335 | ||
336 | ;;;-------------------------------------------------------------------------- | |
337 | ;;; Code generation. | |
1f1d88f5 MW |
338 | |
339 | (defmethod shared-initialize :after | |
340 | ((codegen method-codegen) slot-names &key) | |
1d8cc67a | 341 | (declare (ignore slot-names)) |
1f1d88f5 MW |
342 | (with-slots (message target) codegen |
343 | (setf target | |
e85df3ff | 344 | (if (eq (c-type-subtype (sod-message-type message)) c-type-void) |
1f1d88f5 MW |
345 | :void |
346 | :return)))) | |
347 | ||
dea4d055 MW |
348 | ;;;-------------------------------------------------------------------------- |
349 | ;;; Invoking direct methods. | |
1f1d88f5 | 350 | |
dea4d055 | 351 | (export 'basic-effective-method-body) |
1f1d88f5 MW |
352 | (defun basic-effective-method-body (codegen target method body) |
353 | "Build the common method-invocation structure. | |
354 | ||
355 | Writes to CODEGEN some basic method-invocation instructions. It invokes | |
356 | the `around' methods, from most- to least-specific. If they all delegate, | |
357 | then the `before' methods are run, most-specific first; next, the | |
358 | instructions generated by BODY (invoked with a target argument); then, the | |
359 | `after' methods are run, least-specific first; and, finally, the value | |
360 | delivered by the BODY is returned to the `around' methods. The result | |
361 | returned by the outermost `around' method -- or, if there are none, | |
362 | delivered by the BODY -- is finally delivered to the TARGET." | |
363 | ||
4b8e5c03 MW |
364 | (with-slots (message (class %class) |
365 | before-methods after-methods around-methods) | |
1f1d88f5 MW |
366 | method |
367 | (let* ((message-type (sod-message-type message)) | |
368 | (return-type (c-type-subtype message-type)) | |
1f1d88f5 MW |
369 | (basic-tail (effective-method-basic-argument-names method))) |
370 | (flet ((method-kernel (target) | |
371 | (dolist (before before-methods) | |
372 | (invoke-method codegen :void basic-tail before)) | |
cb35f25e | 373 | (if (null after-methods) |
1f1d88f5 MW |
374 | (funcall body target) |
375 | (convert-stmts codegen target return-type | |
376 | (lambda (target) | |
377 | (funcall body target) | |
378 | (dolist (after (reverse after-methods)) | |
379 | (invoke-method codegen :void | |
a898c9e2 | 380 | basic-tail after))))))) |
1f1d88f5 MW |
381 | (invoke-delegation-chain codegen target basic-tail |
382 | around-methods #'method-kernel))))) | |
383 | ||
384 | ;;;-------------------------------------------------------------------------- | |
dea4d055 | 385 | ;;; Method entry points. |
1f1d88f5 | 386 | |
a07d8d00 | 387 | (defparameter *method-entry-inline-threshold* 200 |
1f1d88f5 MW |
388 | "Threshold below which effective method bodies are inlined into entries. |
389 | ||
390 | After the effective method body has been computed, we calculate its | |
391 | metric, multiply by the number of entries we need to generate, and compare | |
392 | it with this threshold. If the metric is below the threshold then we | |
393 | fold the method body into the entry functions; otherwise we split the | |
394 | effective method out into its own function.") | |
395 | ||
1f1d88f5 | 396 | (defmethod method-entry-function-name |
b426ab51 | 397 | ((method effective-method) (chain-head sod-class) role) |
1f1d88f5 MW |
398 | (let* ((class (effective-method-class method)) |
399 | (message (effective-method-message method)) | |
400 | (message-class (sod-message-class message))) | |
dea4d055 MW |
401 | (if (or (not (slot-boundp method 'functions)) |
402 | (slot-value method 'functions)) | |
b426ab51 MW |
403 | (format nil "~A__mentry~@[__~(~A~)~]_~A__~A__chain_~A" |
404 | class role | |
dea4d055 MW |
405 | (sod-class-nickname message-class) |
406 | (sod-message-name message) | |
407 | (sod-class-nickname chain-head)) | |
944caf84 | 408 | *null-pointer*))) |
dea4d055 | 409 | |
b426ab51 MW |
410 | (defmethod method-entry-slot-name ((entry method-entry)) |
411 | (let* ((method (method-entry-effective-method entry)) | |
412 | (message (effective-method-message method)) | |
413 | (name (sod-message-name message)) | |
414 | (role (method-entry-role entry))) | |
415 | (method-entry-slot-name-by-role entry role name))) | |
416 | ||
dea4d055 MW |
417 | (defmethod method-entry-function-type ((entry method-entry)) |
418 | (let* ((method (method-entry-effective-method entry)) | |
419 | (message (effective-method-message method)) | |
b426ab51 | 420 | (type (sod-message-type message)) |
43073476 MW |
421 | (keywordsp (keyword-message-p message)) |
422 | (raw-tail (append (sod-message-argument-tail message) | |
423 | (and keywordsp (list :ellipsis)))) | |
b426ab51 | 424 | (tail (ecase (method-entry-role entry) |
43073476 MW |
425 | ((nil) raw-tail) |
426 | (:valist (reify-variable-argument-tail raw-tail))))) | |
dea4d055 MW |
427 | (c-type (fun (lisp (c-type-subtype type)) |
428 | ("me" (* (class (method-entry-chain-tail entry)))) | |
b426ab51 MW |
429 | . tail)))) |
430 | ||
43073476 MW |
431 | (defgeneric effective-method-keyword-parser-function-name (method) |
432 | (:documentation | |
433 | "Return the name of the keyword-parsing function for an effective METHOD. | |
434 | ||
435 | See `make-keyword-parser-function' for details of what this function | |
436 | actually does.")) | |
437 | ||
438 | (defmethod effective-method-keyword-parser-function-name | |
439 | ((method basic-effective-method)) | |
440 | (with-slots ((class %class) message) method | |
441 | (format nil "~A__kwparse_~A__~A" | |
442 | class | |
443 | (sod-class-nickname (sod-message-class message)) | |
444 | (sod-message-name message)))) | |
445 | ||
446 | (defun make-keyword-parser-function (codegen method tag set keywords) | |
447 | "Construct and return a keyword-argument parsing function. | |
448 | ||
449 | The function is contributed to the CODEGEN, with the name constructed from | |
450 | the effective METHOD. It will populate an argument structure with the | |
451 | given TAG. In case of error, it will mention the name SET in its report. | |
452 | The KEYWORDS are a list of `argument' objects naming the keywords to be | |
453 | accepted. | |
454 | ||
455 | The generated function has the signature | |
456 | ||
457 | void NAME(struct TAG *kw, va_list *ap, struct kwval *v, size_t n) | |
458 | ||
459 | It assumes that AP includes the first keyword name. (This makes it | |
460 | different from the keyword-parsing functions generated by the | |
461 | `KWSET_PARSEFN' macro, but this interface is slightly more convenient and | |
462 | we don't need to cope with functions which accept no required | |
463 | arguments.)" | |
464 | ||
465 | ;; Let's start, then. | |
466 | (codegen-push codegen) | |
467 | ||
468 | ;; Set up the local variables we'll need. | |
469 | (macrolet ((var (name type) | |
470 | `(ensure-var codegen ,name (c-type ,type)))) | |
471 | (var "k" const-string) | |
472 | (var "aap" (* va-list)) | |
473 | (var "t" (* (struct "kwtab" :const))) | |
474 | (var "vv" (* (struct "kwval" :const))) | |
475 | (var "nn" size-t)) | |
476 | ||
477 | (flet ((call (target func &rest args) | |
478 | ;; Call FUNC with ARGS; return result in TARGET. | |
479 | ||
480 | (apply #'deliver-call codegen target func args)) | |
481 | ||
482 | (convert (target type) | |
483 | ;; Fetch the object of TYPE pointed to by `v->val', and store it | |
484 | ;; in TARGET. | |
485 | ||
486 | (deliver-expr codegen target | |
487 | (format nil "*(~A)v->val" | |
488 | (make-pointer-type (qualify-c-type | |
489 | type (list :const)))))) | |
490 | ||
491 | (namecheck (var name conseq alt) | |
492 | ;; Return an instruction: if VAR matches the string NAME then do | |
493 | ;; CONSEQ; otherwise do ALT. | |
494 | ||
495 | (make-if-inst (make-call-inst "!strcmp" | |
496 | var (prin1-to-string name)) | |
497 | conseq alt))) | |
498 | ||
499 | ;; Prepare the main parsing loops. We're going to construct them both at | |
500 | ;; the same time. They're not quite similar enough for it to be | |
501 | ;; worthwhile abstracting this further, but carving up the keywords is | |
502 | ;; too tedious to write out more than once. | |
503 | (let ((va-act (make-expr-inst (make-call-inst "kw_unknown" set "k"))) | |
504 | (tab-act (make-expr-inst (make-call-inst "kw_unknown" | |
505 | set "v->kw"))) | |
506 | (name (effective-method-keyword-parser-function-name method))) | |
507 | ||
508 | ;; Work through the keywords. We're going to be building up the | |
509 | ;; conditional dispatch from the end, so reverse the (nicely sorted) | |
510 | ;; list before processing it. | |
511 | (dolist (key (reverse keywords)) | |
512 | (let* ((key-name (argument-name key)) | |
513 | (key-type (argument-type key))) | |
514 | ||
515 | ;; Handle the varargs case. | |
516 | (codegen-push codegen) | |
517 | (deliver-expr codegen (format nil "kw->~A__suppliedp" key-name) 1) | |
518 | (call (format nil "kw->~A" key-name) "va_arg" "*ap" key-type) | |
519 | (setf va-act (namecheck "k" key-name | |
520 | (codegen-pop-block codegen) va-act)) | |
521 | ||
522 | ;; Handle the table case. | |
523 | (codegen-push codegen) | |
524 | (deliver-expr codegen (format nil "kw->~A__suppliedp" key-name) 1) | |
525 | (convert (format nil "kw->~A" key-name) key-type) | |
526 | (setf tab-act (namecheck "v->kw" key-name | |
527 | (codegen-pop-block codegen) tab-act)))) | |
528 | ||
529 | ;; Deal with the special `kw.' keywords read via varargs. | |
530 | (codegen-push codegen) | |
531 | (call "vv" "va_arg" "*ap" (c-type (* (struct "kwval" :const)))) | |
532 | (call "nn" "va_arg" "*ap" c-type-size-t) | |
533 | (call :void name "kw" *null-pointer* "vv" "nn") | |
534 | (setf va-act (namecheck "k" "kw.tab" | |
535 | (codegen-pop-block codegen) va-act)) | |
536 | ||
537 | (codegen-push codegen) | |
538 | (call "aap" "va_arg" "*ap" (c-type (* va-list))) | |
539 | (call :void name "kw" "aap" *null-pointer* 0) | |
540 | (setf va-act (namecheck "k" "kw.va_list" | |
541 | (codegen-pop-block codegen) va-act)) | |
542 | ||
543 | ;; Finish up the varargs loop. | |
544 | (emit-banner codegen "Parse keywords from the variable-length tail.") | |
545 | (codegen-push codegen) | |
546 | (call "k" "va_arg" "*ap" c-type-const-string) | |
547 | (emit-inst codegen (make-if-inst "!k" (make-break-inst))) | |
548 | (emit-inst codegen va-act) | |
549 | (let ((loop (make-for-inst nil nil nil (codegen-pop-block codegen)))) | |
550 | (emit-inst codegen | |
551 | (make-if-inst "ap" (make-block-inst nil (list loop))))) | |
552 | ||
553 | ;; Deal with the special `kw.' keywords read from a table. | |
554 | (codegen-push codegen) | |
555 | (deliver-expr codegen "t" | |
556 | (format nil "(~A)v->val" | |
557 | (c-type (* (struct "kwtab" :const))))) | |
558 | (call :void name "kw" *null-pointer* "t->v" "t->n") | |
559 | (setf tab-act (namecheck "v->kw" "kw.tab" | |
560 | (codegen-pop-block codegen) tab-act)) | |
561 | ||
562 | (emit-banner codegen "Parse keywords from the argument table.") | |
563 | (codegen-push codegen) | |
564 | (convert "aap" (c-type (* va-list))) | |
565 | (call :void name "kw" "aap" *null-pointer* 0) | |
566 | (setf tab-act (namecheck "v->kw" "kw.va_list" | |
567 | (codegen-pop-block codegen) tab-act)) | |
568 | ||
569 | ;; Finish off the table loop. | |
570 | (codegen-push codegen) | |
571 | (emit-inst codegen tab-act) | |
572 | (emit-inst codegen (make-expr-inst "v++")) | |
573 | (emit-inst codegen (make-expr-inst "n--")) | |
574 | (emit-inst codegen (make-while-inst "n" (codegen-pop-block codegen))) | |
575 | ||
576 | ;; Wrap the whole lot up with a nice bow. | |
577 | (let ((message (effective-method-message method))) | |
578 | (codegen-pop-function codegen name | |
579 | (c-type (fun void | |
580 | ("kw" (* (struct tag))) | |
581 | ("ap" (* va-list)) | |
582 | ("v" (* (struct "kwval" :const))) | |
583 | ("n" size-t))) | |
584 | "Keyword parsing for `~A.~A' on class `~A'." | |
585 | (sod-class-nickname | |
586 | (sod-message-class message)) | |
587 | (sod-message-name message) | |
588 | (effective-method-class method)))))) | |
589 | ||
b426ab51 MW |
590 | (defmethod make-method-entries ((method basic-effective-method) |
591 | (chain-head sod-class) | |
592 | (chain-tail sod-class)) | |
593 | (let ((entries nil) | |
594 | (message (effective-method-message method))) | |
595 | (flet ((make (role) | |
596 | (push (make-instance 'method-entry | |
597 | :method method :role role | |
598 | :chain-head chain-head | |
599 | :chain-tail chain-tail) | |
600 | entries))) | |
43073476 MW |
601 | (when (or (varargs-message-p message) |
602 | (keyword-message-p message)) | |
603 | (make :valist)) | |
b426ab51 MW |
604 | (make nil) |
605 | entries))) | |
1f1d88f5 MW |
606 | |
607 | (defmethod compute-method-entry-functions ((method basic-effective-method)) | |
608 | ||
609 | ;; OK, there's quite a lot of this, so hold tight. | |
610 | ;; | |
611 | ;; The first thing we need to do is find all of the related objects. This | |
612 | ;; is a bit verbose but fairly straightforward. | |
613 | ;; | |
bf090e02 MW |
614 | ;; Next, we generate the effective method body -- using `compute-effective- |
615 | ;; method-body' of all things. This gives us the declarations and body for | |
1f1d88f5 MW |
616 | ;; an effective method function, but we don't have an actual function yet. |
617 | ;; | |
618 | ;; Now we look at the chains which are actually going to need a method | |
619 | ;; entry: only those chains whose tail (most specific) class is a | |
620 | ;; superclass of the class which defined the message need an entry. We | |
621 | ;; build a list of these tail classes. | |
622 | ;; | |
623 | ;; Having done this, we decide whether it's better to generate a standalone | |
624 | ;; effective-method function and call it from each of the method entries, | |
625 | ;; or to inline the effective method body into each of the entries. | |
626 | ;; | |
627 | ;; Most of the complexity here comes from (a) dealing with the two | |
628 | ;; different strategies for constructing method entry functions and (b) | |
629 | ;; (unsurprisingly) the mess involved with dealing with varargs messages. | |
630 | ||
631 | (let* ((message (effective-method-message method)) | |
632 | (class (effective-method-class method)) | |
633 | (message-class (sod-message-class message)) | |
634 | (return-type (c-type-subtype (sod-message-type message))) | |
635 | (codegen (make-instance 'method-codegen | |
636 | :message message | |
637 | :class class | |
638 | :method method)) | |
639 | ||
1f1d88f5 MW |
640 | ;; Method entry details. |
641 | (chain-tails (remove-if-not (lambda (super) | |
642 | (sod-subclass-p super message-class)) | |
643 | (mapcar #'car | |
644 | (sod-class-chains class)))) | |
645 | (n-entries (length chain-tails)) | |
43073476 MW |
646 | (raw-entry-args (append (sod-message-argument-tail message) |
647 | (and (keyword-message-p message) | |
648 | (list :ellipsis)))) | |
649 | (entry-args (reify-variable-argument-tail raw-entry-args)) | |
650 | (parm-n (let ((tail (last (cons (make-argument "me" c-type-void) | |
651 | raw-entry-args) 2))) | |
652 | (and tail (eq (cadr tail) :ellipsis) | |
653 | (argument-name (car tail))))) | |
3dc0dd23 MW |
654 | (entry-target (codegen-target codegen)) |
655 | ||
656 | ;; Effective method function details. | |
657 | (emf-name (effective-method-function-name method)) | |
658 | (ilayout-type (c-type (* (struct (ilayout-struct-tag class))))) | |
3dc0dd23 MW |
659 | (emf-type (c-type (fun (lisp return-type) |
660 | ("sod__obj" (lisp ilayout-type)) | |
3aab0efa | 661 | . entry-args)))) |
1f1d88f5 | 662 | |
dea4d055 MW |
663 | (flet ((setup-entry (tail) |
664 | (let ((head (sod-class-chain-head tail))) | |
665 | (codegen-push codegen) | |
666 | (ensure-var codegen "sod__obj" ilayout-type | |
667 | (make-convert-to-ilayout-inst class | |
668 | head "me")))) | |
dea4d055 MW |
669 | (finish-entry (tail) |
670 | (let* ((head (sod-class-chain-head tail)) | |
bf8aadd7 MW |
671 | (role (if parm-n :valist nil)) |
672 | (name (method-entry-function-name method head role)) | |
dea4d055 MW |
673 | (type (c-type (fun (lisp return-type) |
674 | ("me" (* (class tail))) | |
675 | . entry-args)))) | |
7de8c666 MW |
676 | (codegen-pop-function codegen name type |
677 | "~@(~@[~A ~]entry~) function ~:_~ | |
678 | for method `~A.~A' ~:_~ | |
679 | via chain headed by `~A' ~:_~ | |
680 | defined on `~A'." | |
681 | (if parm-n "Indirect argument-tail" nil) | |
682 | (sod-class-nickname message-class) | |
683 | (sod-message-name message) | |
684 | head class) | |
bf8aadd7 | 685 | |
43073476 | 686 | ;; If this is a varargs or keyword method then we've made the |
bf8aadd7 MW |
687 | ;; `:valist' role. Also make the `nil' role. |
688 | (when parm-n | |
167524b5 MW |
689 | (let ((call (apply #'make-call-inst name "me" |
690 | (mapcar #'argument-name entry-args))) | |
bf8aadd7 MW |
691 | (main (method-entry-function-name method head nil)) |
692 | (main-type (c-type (fun (lisp return-type) | |
693 | ("me" (* (class tail))) | |
694 | . raw-entry-args)))) | |
695 | (codegen-push codegen) | |
e85df3ff | 696 | (ensure-var codegen *sod-ap* c-type-va-list) |
bf8aadd7 MW |
697 | (convert-stmts codegen entry-target return-type |
698 | (lambda (target) | |
b492babc MW |
699 | (deliver-call codegen :void "va_start" |
700 | *sod-ap* parm-n) | |
df9b9a63 | 701 | (deliver-expr codegen target call) |
b492babc MW |
702 | (deliver-call codegen :void "va_end" |
703 | *sod-ap*))) | |
7de8c666 MW |
704 | (codegen-pop-function codegen main main-type |
705 | "Variable-length argument list ~:_~ | |
706 | entry function ~:_~ | |
707 | for method `~A.~A' ~:_~ | |
708 | via chain headed by `~A' ~:_~ | |
709 | defined on `~A'." | |
710 | (sod-class-nickname message-class) | |
711 | (sod-message-name message) | |
712 | head class)))))) | |
1f1d88f5 MW |
713 | |
714 | ;; Generate the method body. We'll work out what to do with it later. | |
715 | (codegen-push codegen) | |
4e561d89 | 716 | (let* ((result (if (eq return-type c-type-void) nil |
9ec578d9 MW |
717 | (temporary-var codegen return-type))) |
718 | (emf-target (or result :void))) | |
719 | (compute-effective-method-body method codegen emf-target) | |
720 | (multiple-value-bind (vars insts) (codegen-pop codegen) | |
721 | (cond ((or (= n-entries 1) | |
722 | (<= (* n-entries (reduce #'+ insts :key #'inst-metric)) | |
723 | *method-entry-inline-threshold*)) | |
724 | ||
725 | ;; The effective method body is simple -- or there's only | |
726 | ;; one of them. We'll inline the method body into the entry | |
727 | ;; functions. | |
1f1d88f5 MW |
728 | (dolist (tail chain-tails) |
729 | (setup-entry tail) | |
9ec578d9 | 730 | (dolist (var vars) |
66836e14 MW |
731 | (if (typep var 'var-inst) |
732 | (ensure-var codegen (inst-name var) | |
733 | (inst-type var) (inst-init var)) | |
734 | (emit-decl codegen var))) | |
9ec578d9 | 735 | (emit-insts codegen insts) |
9ec578d9 MW |
736 | (deliver-expr codegen entry-target result) |
737 | (finish-entry tail))) | |
738 | ||
739 | (t | |
740 | ||
741 | ;; The effective method body is complicated and we'd need | |
742 | ;; more than one copy. We'll generate an effective method | |
743 | ;; function and call it a lot. | |
744 | (codegen-build-function codegen emf-name emf-type vars | |
745 | (nconc insts (and result | |
7de8c666 MW |
746 | (list (make-return-inst result)))) |
747 | "Effective method function ~:_for `~A.~A' ~:_~ | |
748 | defined on `~A'." | |
749 | (sod-class-nickname message-class) | |
750 | (sod-message-name message) | |
751 | (effective-method-class method)) | |
9ec578d9 | 752 | |
167524b5 | 753 | (let ((call (apply #'make-call-inst emf-name "sod__obj" |
3aab0efa | 754 | (mapcar #'argument-name entry-args)))) |
9ec578d9 MW |
755 | (dolist (tail chain-tails) |
756 | (setup-entry tail) | |
bf8aadd7 | 757 | (deliver-expr codegen entry-target call) |
9ec578d9 | 758 | (finish-entry tail))))))) |
1f1d88f5 MW |
759 | |
760 | (codegen-functions codegen)))) | |
761 | ||
43073476 MW |
762 | (defmethod compute-effective-method-body :around |
763 | ((method basic-effective-method) codegen target) | |
764 | (let* ((message (effective-method-message method)) | |
765 | (keywordsp (keyword-message-p message)) | |
766 | (keywords (effective-method-keywords method)) | |
767 | (ap-addr (format nil "&~A" *sod-tmp-ap*)) | |
768 | (set (format nil "\"~A:~A.~A\"" | |
769 | (sod-class-name (effective-method-class method)) | |
770 | (sod-class-nickname (sod-message-class message)) | |
771 | (sod-message-name message)))) | |
772 | (labels ((call (target func &rest args) | |
773 | (apply #'deliver-call codegen target func args)) | |
774 | (parse-keywords (body) | |
775 | (ensure-var codegen *sod-tmp-ap* c-type-va-list) | |
776 | (call :void "va_copy" *sod-tmp-ap* *sod-ap*) | |
777 | (funcall body) | |
778 | (call :void "va_end" *sod-tmp-ap*))) | |
779 | (cond ((not keywordsp) | |
780 | (call-next-method)) | |
781 | ((null keywords) | |
782 | (let ((*keyword-struct-disposition* :null)) | |
783 | (parse-keywords (lambda () | |
784 | (with-temporary-var | |
785 | (codegen kw c-type-const-string) | |
786 | (call kw "va_arg" | |
787 | *sod-tmp-ap* c-type-const-string) | |
788 | (call :void "kw_parseempty" set | |
789 | kw ap-addr *null-pointer* 0)))) | |
790 | (call-next-method))) | |
791 | (t | |
792 | (let* ((name | |
793 | (effective-method-keyword-parser-function-name method)) | |
794 | (tag (effective-method-keyword-struct-tag method)) | |
795 | (kw-addr (format nil "&~A" *sod-keywords*)) | |
796 | (*keyword-struct-disposition* :local)) | |
797 | (ensure-var codegen *sod-keywords* (c-type (struct tag))) | |
798 | (make-keyword-parser-function codegen method tag set keywords) | |
799 | (parse-keywords (lambda () | |
800 | (call :void name kw-addr ap-addr | |
801 | *null-pointer* 0))) | |
802 | (call-next-method))))))) | |
803 | ||
5135d00a MW |
804 | (defmethod effective-method-live-p ((method simple-effective-method)) |
805 | (effective-method-primary-methods method)) | |
806 | ||
807 | (defmethod compute-method-entry-functions :around ((method effective-method)) | |
808 | (if (effective-method-live-p method) | |
dea4d055 MW |
809 | (call-next-method) |
810 | nil)) | |
811 | ||
812 | (defmethod compute-effective-method-body | |
813 | ((method simple-effective-method) codegen target) | |
599fe2c7 MW |
814 | (basic-effective-method-body codegen target method |
815 | (lambda (target) | |
816 | (simple-method-body method | |
817 | codegen | |
818 | target)))) | |
1f1d88f5 | 819 | |
dea4d055 MW |
820 | ;;;-------------------------------------------------------------------------- |
821 | ;;; Standard method combination. | |
ddee4bb1 | 822 | |
dea4d055 MW |
823 | (export 'standard-message) |
824 | (defclass standard-message (simple-message) | |
825 | () | |
826 | (:documentation | |
1a93d254 | 827 | "Message class for standard method combinations. |
1f1d88f5 | 828 | |
dea4d055 MW |
829 | Standard method combination is a simple method combination where the |
830 | primary methods are invoked as a delegation chain, from most- to | |
831 | least-specific.")) | |
832 | ||
833 | (export 'standard-effective-method) | |
834 | (defclass standard-effective-method (simple-effective-method) () | |
835 | (:documentation "Effective method counterpart to `standard-message'.")) | |
836 | ||
837 | (defmethod primary-method-class ((message standard-message)) | |
838 | 'delegating-direct-method) | |
839 | ||
7f2917d2 | 840 | (defmethod sod-message-effective-method-class ((message standard-message)) |
dea4d055 MW |
841 | 'standard-effective-method) |
842 | ||
843 | (defmethod simple-method-body | |
844 | ((method standard-effective-method) codegen target) | |
845 | (invoke-delegation-chain codegen | |
846 | target | |
847 | (effective-method-basic-argument-names method) | |
848 | (effective-method-primary-methods method) | |
849 | nil)) | |
a07d8d00 | 850 | |
1f1d88f5 | 851 | ;;;----- That's all, folks -------------------------------------------------- |