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Revision 1.50.2.5 - (show annotations)
Tue May 23 16:36:37 2000 UTC (13 years, 10 months ago) by pw
Branch: RELENG_18
Changes since 1.50.2.4: +2 -10 lines
This set of revisions brings the RELENG_18 branch up to HEAD in preparation
for an 18c release.
1 ;;; -*- Log: code.log; Package: Lisp -*-
2 ;;;
3 ;;; **********************************************************************
4 ;;; This code was written as part of the CMU Common Lisp project at
5 ;;; Carnegie Mellon University, and has been placed in the public domain.
6 ;;;
7 (ext:file-comment
8 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/macros.lisp,v 1.50.2.5 2000/05/23 16:36:37 pw Exp $")
9 ;;;
10 ;;; **********************************************************************
11 ;;;
12 ;;; This file contains the macros that are part of the standard
13 ;;; Spice Lisp environment.
14 ;;;
15 ;;; Written by Scott Fahlman and Rob MacLachlan.
16 ;;; Modified by Bill Chiles to adhere to the wall.
17 ;;;
18 (in-package "LISP")
19 (export '(defvar defparameter defconstant when unless setf
20 defsetf psetf shiftf rotatef push pushnew pop
21 incf decf remf case typecase with-open-file
22 with-open-stream with-input-from-string with-output-to-string
23 locally etypecase ctypecase ecase ccase
24 get-setf-expansion define-setf-expander
25 define-modify-macro destructuring-bind nth-value
26 otherwise ; Sacred to CASE and related macros.
27 define-compiler-macro
28 ;; CLtL1 versions:
29 define-setf-method get-setf-method get-setf-method-multiple-value))
30
31 (in-package "EXTENSIONS")
32 (export '(do-anonymous collect iterate))
33
34 (in-package "LISP")
35
36
37 ;;; Parse-Body -- Public
38 ;;;
39 ;;; Parse out declarations and doc strings, *not* expanding macros.
40 ;;; Eventually the environment arg should be flushed, since macros can't expand
41 ;;; into declarations anymore.
42 ;;;
43 (defun parse-body (body environment &optional (doc-string-allowed t))
44 "This function is to parse the declarations and doc-string out of the body of
45 a defun-like form. Body is the list of stuff which is to be parsed.
46 Environment is ignored. If Doc-String-Allowed is true, then a doc string
47 will be parsed out of the body and returned. If it is false then a string
48 will terminate the search for declarations. Three values are returned: the
49 tail of Body after the declarations and doc strings, a list of declare forms,
50 and the doc-string, or NIL if none."
51 (declare (ignore environment))
52 (let ((decls ())
53 (doc nil))
54 (do ((tail body (cdr tail)))
55 ((endp tail)
56 (values tail (nreverse decls) doc))
57 (let ((form (car tail)))
58 (cond ((and (stringp form) (cdr tail))
59 (if doc-string-allowed
60 (setq doc form)
61 (return (values tail (nreverse decls) doc))))
62 ((not (and (consp form) (symbolp (car form))))
63 (return (values tail (nreverse decls) doc)))
64 ((eq (car form) 'declare)
65 (push form decls))
66 (t
67 (return (values tail (nreverse decls) doc))))))))
68
69
70 ;;;; DEFMACRO:
71
72 ;;; Defmacro -- Public
73 ;;;
74 ;;; Parse the definition and make an expander function. The actual
75 ;;; definition is done by %defmacro which we expand into.
76 ;;;
77 (defmacro defmacro (name lambda-list &body body)
78 (let ((whole (gensym "WHOLE-"))
79 (environment (gensym "ENV-")))
80 (multiple-value-bind
81 (body local-decs doc)
82 (parse-defmacro lambda-list whole body name 'defmacro
83 :environment environment)
84 (let ((def `(lambda (,whole ,environment)
85 ,@local-decs
86 (block ,name
87 ,body))))
88 `(c::%defmacro ',name #',def ',lambda-list ,doc)))))
89
90
91 ;;; %Defmacro, %%Defmacro -- Internal
92 ;;;
93 ;;; Defmacro expands into %Defmacro which is a function that is treated
94 ;;; magically the compiler. After the compiler has gotten the information it
95 ;;; wants out of macro definition, it compiles a call to %%Defmacro which
96 ;;; happens at load time. We have a %Defmacro function which just calls
97 ;;; %%Defmacro in order to keep the interpreter happy.
98 ;;;
99 ;;; Eventually %%Defmacro should deal with clearing old compiler information
100 ;;; for the functional value.
101 ;;;
102 (defun c::%defmacro (name definition lambda-list doc)
103 (assert (eval:interpreted-function-p definition))
104 (setf (eval:interpreted-function-name definition)
105 (format nil "DEFMACRO ~S" name))
106 (setf (eval:interpreted-function-arglist definition) lambda-list)
107 (c::%%defmacro name definition doc))
108 ;;;
109 (defun c::%%defmacro (name definition doc)
110 (clear-info function where-from name)
111 (setf (macro-function name) definition)
112 (setf (documentation name 'function) doc)
113 name)
114
115
116
117 ;;;; DEFINE-COMPILER-MACRO
118
119 (defmacro define-compiler-macro (name lambda-list &body body)
120 "Define a compiler-macro for NAME."
121 (let ((whole (gensym "WHOLE-"))
122 (environment (gensym "ENV-")))
123 (multiple-value-bind
124 (body local-decs doc)
125 (parse-defmacro lambda-list whole body name 'define-compiler-macro
126 :environment environment)
127 (let ((def `(lambda (,whole ,environment)
128 ,@local-decs
129 (block ,name
130 ,body))))
131 `(c::%define-compiler-macro ',name #',def ',lambda-list ,doc)))))
132
133 (defun c::%define-compiler-macro (name definition lambda-list doc)
134 (assert (eval:interpreted-function-p definition))
135 (setf (eval:interpreted-function-name definition)
136 (let ((*print-case* :upcase))
137 (format nil "DEFINE-COMPILER-MACRO ~S" name)))
138 (setf (eval:interpreted-function-arglist definition) lambda-list)
139 (c::%%define-compiler-macro name definition doc))
140 ;;;
141 (defun c::%%define-compiler-macro (name definition doc)
142 (setf (compiler-macro-function name) definition)
143 (setf (documentation name 'compiler-macro) doc)
144 name)
145
146
147
148 ;;; DEFTYPE is a lot like DEFMACRO.
149
150 (defmacro deftype (name arglist &body body)
151 "Syntax like DEFMACRO, but defines a new type."
152 (unless (symbolp name)
153 (error "~S -- Type name not a symbol." name))
154
155 (let ((whole (gensym "WHOLE-")))
156 (multiple-value-bind (body local-decs doc)
157 (parse-defmacro arglist whole body name 'deftype
158 :default-default ''*)
159 `(eval-when (compile load eval)
160 (%deftype ',name
161 #'(lambda (,whole)
162 ,@local-decs
163 (block ,name ,body))
164 ,@(when doc `(,doc)))))))
165 ;;;
166 (defun %deftype (name expander &optional doc)
167 (ecase (info type kind name)
168 (:primitive
169 (when *type-system-initialized*
170 (error "Illegal to redefine standard type: ~S." name)))
171 (:instance
172 (warn "Redefining class ~S to be a DEFTYPE." name)
173 (undefine-structure (layout-info (class-layout (find-class name))))
174 (setf (class-cell-class (find-class-cell name)) nil)
175 (setf (info type compiler-layout name) nil)
176 (setf (info type kind name) :defined))
177 (:defined)
178 ((nil)
179 (setf (info type kind name) :defined)))
180
181 (setf (info type expander name) expander)
182 (when doc
183 (setf (documentation name 'type) doc))
184 ;; ### Bootstrap hack -- we need to define types before %note-type-defined
185 ;; is defined.
186 (when (fboundp 'c::%note-type-defined)
187 (c::%note-type-defined name))
188 name)
189
190
191 ;;; And so is DEFINE-SETF-EXPANDER.
192
193 (defparameter defsetf-error-string "Setf expander for ~S cannot be called with ~S args.")
194
195 (defmacro define-setf-expander (access-fn lambda-list &body body)
196 "Syntax like DEFMACRO, but creates a Setf-Method generator. The body
197 must be a form that returns the five magical values."
198 (unless (symbolp access-fn)
199 (error "~S -- Access-function name not a symbol in DEFINE-SETF-EXPANDER."
200 access-fn))
201
202 (let ((whole (gensym "WHOLE-"))
203 (environment (gensym "ENV-")))
204 (multiple-value-bind (body local-decs doc)
205 (parse-defmacro lambda-list whole body access-fn
206 'define-setf-expander
207 :environment environment)
208 `(eval-when (load compile eval)
209 (%define-setf-macro
210 ',access-fn
211 #'(lambda (,whole ,environment)
212 ,@local-decs
213 (block ,access-fn ,body))
214 nil
215 ',doc)))))
216
217 (defmacro define-setf-method (&rest stuff)
218 "Obsolete, use define-setf-expander."
219 `(define-setf-expander ,@stuff))
220
221
222 ;;; %DEFINE-SETF-MACRO -- Internal
223 ;;;
224 ;;; Do stuff for defining a setf macro.
225 ;;;
226 (defun %define-setf-macro (name expander inverse doc)
227 (cond ((not (fboundp `(setf ,name))))
228 ((info function accessor-for name)
229 (warn "Defining setf macro for destruct slot accessor; redefining as ~
230 a normal function:~% ~S"
231 name)
232 (c::define-function-name name))
233 ((not (eq (symbol-package name) (symbol-package 'aref)))
234 (warn "Defining setf macro for ~S, but ~S is fbound."
235 name `(setf ,name))))
236 (when (or inverse (info setf inverse name))
237 (setf (info setf inverse name) inverse))
238 (when (or expander (info setf expander name))
239 (setf (info setf expander name) expander))
240 (when doc
241 (setf (documentation name 'setf) doc))
242 name)
243
244
245 ;;;; Destructuring-bind
246
247 (defmacro destructuring-bind (lambda-list arg-list &rest body)
248 "Bind the variables in LAMBDA-LIST to the contents of ARG-LIST."
249 (let* ((arg-list-name (gensym "ARG-LIST-")))
250 (multiple-value-bind
251 (body local-decls)
252 (parse-defmacro lambda-list arg-list-name body nil 'destructuring-bind
253 :annonymousp t :doc-string-allowed nil)
254 `(let ((,arg-list-name ,arg-list))
255 ,@local-decls
256 ,body))))
257
258
259 ;;;; Defun, Defvar, Defparameter, Defconstant:
260
261 ;;; Defun -- Public
262 ;;;
263 ;;; Very similar to Defmacro, but simpler. We don't have to parse the
264 ;;; lambda-list.
265 ;;;
266 (defmacro defun (&whole source name lambda-list &body (body decls doc))
267 (let ((def `(lambda ,lambda-list
268 ,@decls
269 (block ,(if (and (consp name) (eq (car name) 'setf))
270 (cadr name)
271 name)
272 ,@body))))
273 `(c::%defun ',name #',def ,doc ',source)))
274
275
276 ;;; %Defun, %%Defun -- Internal
277 ;;;
278 ;;; Similar to %Defmacro, ...
279 ;;;
280 (defun c::%%defun (name def doc &optional inline-expansion)
281 (setf (fdefinition name) def)
282 (when doc
283 (if (and (consp name) (eq (first name) 'setf))
284 (setf (documentation (second name) 'setf) doc)
285 (setf (documentation name 'function) doc)))
286 (c::define-function-name name)
287 (when (eq (info function where-from name) :assumed)
288 (setf (info function where-from name) :defined)
289 (when (info function assumed-type name)
290 (setf (info function assumed-type name) nil)))
291 (when (or inline-expansion
292 (info function inline-expansion name))
293 (setf (info function inline-expansion name) inline-expansion))
294 name)
295 ;;;
296 (defun c::%defun (name def doc source)
297 (declare (ignore source))
298 (assert (eval:interpreted-function-p def))
299 (setf (eval:interpreted-function-name def) name)
300 (c::%%defun name def doc))
301
302
303 ;;; DEFCONSTANT -- Public
304 ;;;
305 (defmacro defconstant (var val &optional doc)
306 "For defining global constants at top level. The DEFCONSTANT says that the
307 value is constant and may be compiled into code. If the variable already has
308 a value, and this is not equal to the init, an error is signalled. The third
309 argument is an optional documentation string for the variable."
310 `(c::%defconstant ',var ,val ',doc))
311
312 ;;; %Defconstant, %%Defconstant -- Internal
313 ;;;
314 ;;; Like the other %mumbles except that we currently actually do something
315 ;;; interesting at load time, namely checking if the constant is being
316 ;;; redefined.
317 ;;;
318 (defun c::%defconstant (name value doc)
319 (c::%%defconstant name value doc))
320 ;;;
321 (defun c::%%defconstant (name value doc)
322 (when doc
323 (setf (documentation name 'variable) doc))
324 (when (boundp name)
325 (unless (equalp (symbol-value name) value)
326 (cerror "Go ahead and change the value."
327 "Constant ~S being redefined." name)))
328 (setf (symbol-value name) value)
329 (setf (info variable kind name) :constant)
330 (clear-info variable constant-value name)
331 name)
332
333
334 (defmacro defvar (var &optional (val nil valp) (doc nil docp))
335 "For defining global variables at top level. Declares the variable
336 SPECIAL and, optionally, initializes it. If the variable already has a
337 value, the old value is not clobbered. The third argument is an optional
338 documentation string for the variable."
339 `(progn
340 (proclaim '(special ,var))
341 ,@(when valp
342 `((unless (boundp ',var)
343 (setq ,var ,val))))
344 ,@(when docp
345 `((setf (documentation ',var 'variable) ',doc)))
346 ',var))
347
348 (defmacro defparameter (var val &optional (doc nil docp))
349 "Defines a parameter that is not normally changed by the program,
350 but that may be changed without causing an error. Declares the
351 variable special and sets its value to VAL. The third argument is
352 an optional documentation string for the parameter."
353 `(progn
354 (proclaim '(special ,var))
355 (setq ,var ,val)
356 ,@(when docp
357 `((setf (documentation ',var 'variable) ',doc)))
358 ',var))
359
360
361 ;;;; ASSORTED CONTROL STRUCTURES
362
363
364 (defmacro when (test &body forms)
365 "First arg is a predicate. If it is non-null, the rest of the forms are
366 evaluated as a PROGN."
367 `(cond (,test nil ,@forms)))
368
369 (defmacro unless (test &rest forms)
370 "First arg is a predicate. If it is null, the rest of the forms are
371 evaluated as a PROGN."
372 `(cond ((not ,test) nil ,@forms)))
373
374
375 (defmacro return (&optional (value nil))
376 `(return-from nil ,value))
377
378 (defmacro prog (varlist &body (body decls))
379 `(block nil
380 (let ,varlist
381 ,@decls
382 (tagbody ,@body))))
383
384 (defmacro prog* (varlist &body (body decls))
385 `(block nil
386 (let* ,varlist
387 ,@decls
388 (tagbody ,@body))))
389
390
391 ;;; Prog1, Prog2 -- Public
392 ;;;
393 ;;; These just turn into a Let.
394 ;;;
395 (defmacro prog1 (result &rest body)
396 (let ((n-result (gensym)))
397 `(let ((,n-result ,result))
398 ,@body
399 ,n-result)))
400 ;;;
401 (defmacro prog2 (form1 result &rest body)
402 `(prog1 (progn ,form1 ,result) ,@body))
403
404
405 ;;; And, Or -- Public
406 ;;;
407 ;;; AND and OR are defined in terms of IF.
408 ;;;
409 (defmacro and (&rest forms)
410 (cond ((endp forms) t)
411 ((endp (rest forms)) (first forms))
412 (t
413 `(if ,(first forms)
414 (and ,@(rest forms))
415 nil))))
416 ;;;
417 (defmacro or (&rest forms)
418 (cond ((endp forms) nil)
419 ((endp (rest forms)) (first forms))
420 (t
421 (let ((n-result (gensym)))
422 `(let ((,n-result ,(first forms)))
423 (if ,n-result
424 ,n-result
425 (or ,@(rest forms))))))))
426
427
428 ;;; Cond -- Public
429 ;;;
430 ;;; COND also turns into IF.
431 ;;;
432 (defmacro cond (&rest clauses)
433 (if (endp clauses)
434 nil
435 (let ((clause (first clauses)))
436 (when (atom clause)
437 (error "Cond clause is not a list: ~S." clause))
438 (let ((test (first clause))
439 (forms (rest clause)))
440 (if (endp forms)
441 (let ((n-result (gensym)))
442 `(let ((,n-result ,test))
443 (if ,n-result
444 ,n-result
445 (cond ,@(rest clauses)))))
446 `(if ,test
447 (progn ,@forms)
448 (cond ,@(rest clauses))))))))
449
450
451 ;;;; Multiple value macros:
452
453 ;;; Multiple-Value-XXX -- Public
454 ;;;
455 ;;; All the multiple-value receiving forms are defined in terms of
456 ;;; Multiple-Value-Call.
457 ;;;
458 (defmacro multiple-value-setq (varlist value-form)
459 (unless (and (listp varlist) (every #'symbolp varlist))
460 (error "Varlist is not a list of symbols: ~S." varlist))
461 (let ((temps (mapcar #'(lambda (x) (declare (ignore x)) (gensym)) varlist)))
462 `(multiple-value-bind ,temps ,value-form
463 ,@(mapcar #'(lambda (var temp)
464 `(setq ,var ,temp))
465 varlist temps)
466 ,(car temps))))
467 ;;;
468 (defmacro multiple-value-bind (varlist value-form &body body)
469 (unless (and (listp varlist) (every #'symbolp varlist))
470 (error "Varlist is not a list of symbols: ~S." varlist))
471 (if (= (length varlist) 1)
472 `(let ((,(car varlist) ,value-form))
473 ,@body)
474 (let ((ignore (gensym)))
475 `(multiple-value-call #'(lambda (&optional ,@varlist &rest ,ignore)
476 (declare (ignore ,ignore))
477 ,@body)
478 ,value-form))))
479 ;;;
480 (defmacro multiple-value-list (value-form)
481 `(multiple-value-call #'list ,value-form))
482
483
484 (defmacro nth-value (n form)
485 "Evaluates FORM and returns the Nth value (zero based). This involves no
486 consing when N is a trivial constant integer."
487 (if (integerp n)
488 (let ((dummy-list nil)
489 (keeper (gensym "KEEPER-")))
490 ;; We build DUMMY-LIST, a list of variables to bind to useless
491 ;; values, then we explicitly IGNORE those bindings and return
492 ;; KEEPER, the only thing we're really interested in right now.
493 (dotimes (i n)
494 (push (gensym "IGNORE-") dummy-list))
495 `(multiple-value-bind (,@dummy-list ,keeper)
496 ,form
497 (declare (ignore ,@dummy-list))
498 ,keeper))
499 (once-only ((n n))
500 `(case (the fixnum ,n)
501 (0 (nth-value 0 ,form))
502 (1 (nth-value 1 ,form))
503 (2 (nth-value 2 ,form))
504 (T (nth (the fixnum ,n) (multiple-value-list ,form)))))))
505
506
507 ;;;; SETF and friends.
508
509 ;;; Note: The expansions for SETF and friends sometimes create needless
510 ;;; LET-bindings of argument values. The compiler will remove most of
511 ;;; these spurious bindings, so SETF doesn't worry too much about creating
512 ;;; them.
513
514 ;;; The inverse for a generalized-variable reference function is stored in
515 ;;; one of two ways:
516 ;;;
517 ;;; A SETF inverse property corresponds to the short form of DEFSETF. It is
518 ;;; the name of a function takes the same args as the reference form, plus a
519 ;;; new-value arg at the end.
520 ;;;
521 ;;; A SETF method expander is created by the long form of DEFSETF or
522 ;;; by DEFINE-SETF-EXPANDER. It is a function that is called on the reference
523 ;;; form and that produces five values: a list of temporary variables, a list
524 ;;; of value forms, a list of the single store-value form, a storing function,
525 ;;; and an accessing function.
526
527 (defun get-setf-expansion (form &optional environment)
528 "Returns five values needed by the SETF machinery: a list of temporary
529 variables, a list of values with which to fill them, a list of temporaries
530 for the new values, the setting function, and the accessing function."
531 (let (temp)
532 (cond ((symbolp form)
533 (multiple-value-bind
534 (expansion expanded)
535 (macroexpand-1 form environment)
536 (if expanded
537 (get-setf-expansion expansion environment)
538 (let ((new-var (gensym)))
539 (values nil nil (list new-var)
540 `(setq ,form ,new-var) form)))))
541 ;;
542 ;; Local functions inhibit global setf methods...
543 ((and environment
544 (let ((name (car form)))
545 (dolist (x (c::lexenv-functions environment) nil)
546 (when (and (eq (car x) name)
547 (not (c::defined-function-p (cdr x))))
548 (return t)))))
549 (expand-or-get-setf-inverse form environment))
550 ((setq temp (info setf inverse (car form)))
551 (get-setf-method-inverse form `(,temp) nil))
552 ((setq temp (info setf expander (car form)))
553 (funcall temp form environment))
554 (t
555 (expand-or-get-setf-inverse form environment)))))
556
557 (defun get-setf-method-multiple-value (form &optional env)
558 "Obsolete: use GET-SETF-EXPANSION."
559 (get-setf-expansion form env))
560
561 ;;;
562 ;;; If a macro, expand one level and try again. If not, go for the
563 ;;; SETF function.
564 (defun expand-or-get-setf-inverse (form environment)
565 (multiple-value-bind
566 (expansion expanded)
567 (macroexpand-1 form environment)
568 (if expanded
569 (get-setf-expansion expansion environment)
570 (get-setf-method-inverse form `(funcall #'(setf ,(car form)))
571 t))))
572
573
574 (defun get-setf-method-inverse (form inverse setf-function)
575 (let ((new-var (gensym))
576 (vars nil)
577 (vals nil))
578 (dolist (x (cdr form))
579 (push (gensym) vars)
580 (push x vals))
581 (setq vals (nreverse vals))
582 (values vars vals (list new-var)
583 (if setf-function
584 `(,@inverse ,new-var ,@vars)
585 `(,@inverse ,@vars ,new-var))
586 `(,(car form) ,@vars))))
587
588
589 (defun get-setf-method (form &optional environment)
590 "Obsolete: use GET-SETF-EXPANSION and handle multiple store values."
591 (multiple-value-bind
592 (temps value-forms store-vars store-form access-form)
593 (get-setf-expansion form environment)
594 (when (cdr store-vars)
595 (error "GET-SETF-METHOD used for a form with multiple store ~
596 variables:~% ~S" form))
597 (values temps value-forms store-vars store-form access-form)))
598
599
600 (defun defsetter (fn rest)
601 (let ((arglist (car rest))
602 (arglist-var (gensym "ARGS-"))
603 (new-var (car (cadr rest))))
604 (multiple-value-bind
605 (body local-decs doc)
606 (parse-defmacro arglist arglist-var (cddr rest) fn 'defsetf)
607 (values
608 `(lambda (,arglist-var ,new-var)
609 ,@local-decs
610 ,body)
611 doc))))
612
613
614 (defmacro defsetf (access-fn &rest rest)
615 "Associates a SETF update function or macro with the specified access
616 function or macro. The format is complex. See the manual for
617 details."
618 (cond ((not (listp (car rest)))
619 `(eval-when (load compile eval)
620 (%define-setf-macro ',access-fn nil ',(car rest)
621 ,(when (and (car rest) (stringp (cadr rest)))
622 `',(cadr rest)))))
623 ((and (cdr rest) (listp (cadr rest)))
624 (destructuring-bind
625 (lambda-list (&rest store-variables) &body body)
626 rest
627 (let ((arglist-var (gensym "ARGS-"))
628 (access-form-var (gensym "ACCESS-FORM-"))
629 (env-var (gensym "ENVIRONMENT-")))
630 (multiple-value-bind
631 (body local-decs doc)
632 (parse-defmacro `(,lambda-list ,@store-variables)
633 arglist-var body access-fn 'defsetf
634 :annonymousp t)
635 `(eval-when (load compile eval)
636 (%define-setf-macro
637 ',access-fn
638 #'(lambda (,access-form-var ,env-var)
639 (declare (ignore ,env-var))
640 (%defsetf ,access-form-var ,(length store-variables)
641 #'(lambda (,arglist-var)
642 ,@local-decs
643 (block ,access-fn
644 ,body))))
645 nil
646 ',doc))))))
647 (t
648 (error "Ill-formed DEFSETF for ~S." access-fn))))
649
650 (defun %defsetf (orig-access-form num-store-vars expander)
651 (collect ((subforms) (subform-vars) (subform-exprs) (store-vars))
652 (dolist (subform (cdr orig-access-form))
653 (if (constantp subform)
654 (subforms subform)
655 (let ((var (gensym)))
656 (subforms var)
657 (subform-vars var)
658 (subform-exprs subform))))
659 (dotimes (i num-store-vars)
660 (store-vars (gensym)))
661 (values (subform-vars)
662 (subform-exprs)
663 (store-vars)
664 (funcall expander (cons (subforms) (store-vars)))
665 `(,(car orig-access-form) ,@(subforms)))))
666
667
668 ;;; SETF -- Public
669 ;;;
670 ;;; Except for atoms, we always call GET-SETF-METHOD, since it has some
671 ;;; non-trivial semantics. But when there is a setf inverse, and G-S-M uses
672 ;;; it, then we return a call to the inverse, rather than returning a hairy let
673 ;;; form. This is probably important mainly as a convenince in allowing the
674 ;;; use of setf inverses without the full interpreter.
675 ;;;
676 (defmacro setf (&rest args &environment env)
677 "Takes pairs of arguments like SETQ. The first is a place and the second
678 is the value that is supposed to go into that place. Returns the last
679 value. The place argument may be any of the access forms for which SETF
680 knows a corresponding setting form."
681 (let ((nargs (length args)))
682 (cond
683 ((= nargs 2)
684 (let ((place (first args))
685 (value-form (second args)))
686 (if (atom place)
687 `(setq ,place ,value-form)
688 (multiple-value-bind (dummies vals newval setter getter)
689 (get-setf-expansion place env)
690 (declare (ignore getter))
691 (let ((inverse (info setf inverse (car place))))
692 (if (and inverse (eq inverse (car setter)))
693 `(,inverse ,@(cdr place) ,value-form)
694 `(let* (,@(mapcar #'list dummies vals))
695 (multiple-value-bind ,newval ,value-form
696 ,setter))))))))
697 ((oddp nargs)
698 (error "Odd number of args to SETF."))
699 (t
700 (do ((a args (cddr a)) (l nil))
701 ((null a) `(progn ,@(nreverse l)))
702 (setq l (cons (list 'setf (car a) (cadr a)) l)))))))
703
704 (defmacro psetf (&rest args &environment env)
705 "This is to SETF as PSETQ is to SETQ. Args are alternating place
706 expressions and values to go into those places. All of the subforms and
707 values are determined, left to right, and only then are the locations
708 updated. Returns NIL."
709 (collect ((let*-bindings) (mv-bindings) (setters))
710 (do ((a args (cddr a)))
711 ((endp a))
712 (if (endp (cdr a))
713 (error "Odd number of args to PSETF."))
714 (multiple-value-bind
715 (dummies vals newval setter getter)
716 (get-setf-expansion (car a) env)
717 (declare (ignore getter))
718 (let*-bindings (mapcar #'list dummies vals))
719 (mv-bindings (list newval (cadr a)))
720 (setters setter)))
721 (labels ((thunk (let*-bindings mv-bindings)
722 (if let*-bindings
723 `(let* ,(car let*-bindings)
724 (multiple-value-bind ,@(car mv-bindings)
725 ,(thunk (cdr let*-bindings) (cdr mv-bindings))))
726 `(progn ,@(setters) nil))))
727 (thunk (let*-bindings) (mv-bindings)))))
728
729 (defmacro shiftf (&whole form &rest args &environment env)
730 "One or more SETF-style place expressions, followed by a single
731 value expression. Evaluates all of the expressions in turn, then
732 assigns the value of each expression to the place on its left,
733 returning the value of the leftmost."
734 (when (< (length args) 2)
735 (error "~S called with too few arguments: ~S" 'shiftf form))
736 (let ((resultvar (gensym)))
737 (do ((arglist args (cdr arglist))
738 (bindlist nil)
739 (storelist nil)
740 (lastvar resultvar))
741 ((atom (cdr arglist))
742 (push `(,lastvar ,(first arglist)) bindlist)
743 `(LET* ,(nreverse bindlist) ,@(nreverse storelist) ,resultvar))
744 (multiple-value-bind (SM1 SM2 SM3 SM4 SM5)
745 (get-setf-method (first arglist) env)
746 (mapc #'(lambda (var val) (push `(,var ,val) bindlist)) SM1 SM2)
747 (push `(,lastvar ,SM5) bindlist)
748 (push SM4 storelist)
749 (setq lastvar (first SM3))))))
750
751 (defmacro rotatef (&rest args &environment env)
752 "Takes any number of SETF-style place expressions. Evaluates all of the
753 expressions in turn, then assigns to each place the value of the form to
754 its right. The rightmost form gets the value of the leftmost.
755 Returns NIL."
756 (when args
757 (collect ((let*-bindings) (mv-bindings) (setters) (getters))
758 (dolist (arg args)
759 (multiple-value-bind
760 (temps subforms store-vars setter getter)
761 (get-setf-expansion arg env)
762 (loop
763 for temp in temps
764 for subform in subforms
765 do (let*-bindings `(,temp ,subform)))
766 (mv-bindings store-vars)
767 (setters setter)
768 (getters getter)))
769 (setters nil)
770 (getters (car (getters)))
771 (labels ((thunk (mv-bindings getters)
772 (if mv-bindings
773 `((multiple-value-bind
774 ,(car mv-bindings)
775 ,(car getters)
776 ,@(thunk (cdr mv-bindings) (cdr getters))))
777 (setters))))
778 `(let* ,(let*-bindings)
779 ,@(thunk (mv-bindings) (cdr (getters))))))))
780
781
782 (defmacro define-modify-macro (name lambda-list function &optional doc-string)
783 "Creates a new read-modify-write macro like PUSH or INCF."
784 (let ((other-args nil)
785 (rest-arg nil)
786 (env (gensym))
787 (reference (gensym)))
788
789 ;; Parse out the variable names and rest arg from the lambda list.
790 (do ((ll lambda-list (cdr ll))
791 (arg nil))
792 ((null ll))
793 (setq arg (car ll))
794 (cond ((eq arg '&optional))
795 ((eq arg '&rest)
796 (if (symbolp (cadr ll))
797 (setq rest-arg (cadr ll))
798 (error "Non-symbol &rest arg in definition of ~S." name))
799 (if (null (cddr ll))
800 (return nil)
801 (error "Illegal stuff after &rest arg in Define-Modify-Macro.")))
802 ((memq arg '(&key &allow-other-keys &aux))
803 (error "~S not allowed in Define-Modify-Macro lambda list." arg))
804 ((symbolp arg)
805 (push arg other-args))
806 ((and (listp arg) (symbolp (car arg)))
807 (push (car arg) other-args))
808 (t (error "Illegal stuff in lambda list of Define-Modify-Macro."))))
809 (setq other-args (nreverse other-args))
810 `(defmacro ,name (,reference ,@lambda-list &environment ,env)
811 ,doc-string
812 (multiple-value-bind (dummies vals newval setter getter)
813 (get-setf-method ,reference ,env)
814 (do ((d dummies (cdr d))
815 (v vals (cdr v))
816 (let-list nil (cons (list (car d) (car v)) let-list)))
817 ((null d)
818 (push
819 (list (car newval)
820 ,(if rest-arg
821 `(list* ',function getter ,@other-args ,rest-arg)
822 `(list ',function getter ,@other-args)))
823 let-list)
824 `(let* ,(nreverse let-list)
825 ,setter)))))))
826
827 (defmacro push (obj place &environment env)
828 "Takes an object and a location holding a list. Conses the object onto
829 the list, returning the modified list. OBJ is evaluated before PLACE."
830 (if (symbolp place)
831 `(setq ,place (cons ,obj ,place))
832 (multiple-value-bind (dummies vals newval setter getter)
833 (get-setf-method place env)
834 (let ((g (gensym)))
835 `(let* ((,g ,obj)
836 ,@(mapcar #'list dummies vals)
837 (,(car newval) (cons ,g ,getter)))
838 ,setter)))))
839
840 (defmacro pushnew (obj place &rest keys &environment env)
841 "Takes an object and a location holding a list. If the object is already
842 in the list, does nothing. Else, conses the object onto the list. Returns
843 NIL. If there is a :TEST keyword, this is used for the comparison."
844 (if (symbolp place)
845 `(setq ,place (adjoin ,obj ,place ,@keys))
846 (multiple-value-bind (dummies vals newval setter getter)
847 (get-setf-method place env)
848 (do* ((d dummies (cdr d))
849 (v vals (cdr v))
850 (let-list nil))
851 ((null d)
852 (push (list (car newval) `(adjoin ,obj ,getter ,@keys))
853 let-list)
854 `(let* ,(nreverse let-list)
855 ,setter))
856 (push (list (car d) (car v)) let-list)))))
857
858
859 (defmacro pop (place &environment env)
860 "The argument is a location holding a list. Pops one item off the front
861 of the list and returns it."
862 (if (symbolp place)
863 `(prog1 (car ,place) (setq ,place (cdr ,place)))
864 (multiple-value-bind (dummies vals newval setter getter)
865 (get-setf-method place env)
866 (do* ((d dummies (cdr d))
867 (v vals (cdr v))
868 (let-list nil))
869 ((null d)
870 (push (list (car newval) getter) let-list)
871 `(let* ,(nreverse let-list)
872 (prog1 (car ,(car newval))
873 (setq ,(car newval) (cdr ,(car newval)))
874 ,setter)))
875 (push (list (car d) (car v)) let-list)))))
876
877
878 (define-modify-macro incf (&optional (delta 1)) +
879 "The first argument is some location holding a number. This number is
880 incremented by the second argument, DELTA, which defaults to 1.")
881
882
883 (define-modify-macro decf (&optional (delta 1)) -
884 "The first argument is some location holding a number. This number is
885 decremented by the second argument, DELTA, which defaults to 1.")
886
887
888 (defmacro remf (place indicator &environment env)
889 "Place may be any place expression acceptable to SETF, and is expected
890 to hold a property list or (). This list is destructively altered to
891 remove the property specified by the indicator. Returns T if such a
892 property was present, NIL if not."
893 (multiple-value-bind (dummies vals newval setter getter)
894 (get-setf-method place env)
895 (do* ((d dummies (cdr d))
896 (v vals (cdr v))
897 (let-list nil)
898 (ind-temp (gensym))
899 (local1 (gensym))
900 (local2 (gensym)))
901 ((null d)
902 (push (list (car newval) getter) let-list)
903 (push (list ind-temp indicator) let-list)
904 `(let* ,(nreverse let-list)
905 (do ((,local1 ,(car newval) (cddr ,local1))
906 (,local2 nil ,local1))
907 ((atom ,local1) nil)
908 (cond ((atom (cdr ,local1))
909 (error "Odd-length property list in REMF."))
910 ((eq (car ,local1) ,ind-temp)
911 (cond (,local2
912 (rplacd (cdr ,local2) (cddr ,local1))
913 (return t))
914 (t (setq ,(car newval) (cddr ,(car newval)))
915 ,setter
916 (return t))))))))
917 (push (list (car d) (car v)) let-list))))
918
919
920 ;;; The built-in DEFSETFs.
921
922 (defsetf car %rplaca)
923 (defsetf cdr %rplacd)
924 (defsetf caar (x) (v) `(%rplaca (car ,x) ,v))
925 (defsetf cadr (x) (v) `(%rplaca (cdr ,x) ,v))
926 (defsetf cdar (x) (v) `(%rplacd (car ,x) ,v))
927 (defsetf cddr (x) (v) `(%rplacd (cdr ,x) ,v))
928 (defsetf caaar (x) (v) `(%rplaca (caar ,x) ,v))
929 (defsetf cadar (x) (v) `(%rplaca (cdar ,x) ,v))
930 (defsetf cdaar (x) (v) `(%rplacd (caar ,x) ,v))
931 (defsetf cddar (x) (v) `(%rplacd (cdar ,x) ,v))
932 (defsetf caadr (x) (v) `(%rplaca (cadr ,x) ,v))
933 (defsetf caddr (x) (v) `(%rplaca (cddr ,x) ,v))
934 (defsetf cdadr (x) (v) `(%rplacd (cadr ,x) ,v))
935 (defsetf cdddr (x) (v) `(%rplacd (cddr ,x) ,v))
936 (defsetf caaaar (x) (v) `(%rplaca (caaar ,x) ,v))
937 (defsetf cadaar (x) (v) `(%rplaca (cdaar ,x) ,v))
938 (defsetf cdaaar (x) (v) `(%rplacd (caaar ,x) ,v))
939 (defsetf cddaar (x) (v) `(%rplacd (cdaar ,x) ,v))
940 (defsetf caadar (x) (v) `(%rplaca (cadar ,x) ,v))
941 (defsetf caddar (x) (v) `(%rplaca (cddar ,x) ,v))
942 (defsetf cdadar (x) (v) `(%rplacd (cadar ,x) ,v))
943 (defsetf cdddar (x) (v) `(%rplacd (cddar ,x) ,v))
944 (defsetf caaadr (x) (v) `(%rplaca (caadr ,x) ,v))
945 (defsetf cadadr (x) (v) `(%rplaca (cdadr ,x) ,v))
946 (defsetf cdaadr (x) (v) `(%rplacd (caadr ,x) ,v))
947 (defsetf cddadr (x) (v) `(%rplacd (cdadr ,x) ,v))
948 (defsetf caaddr (x) (v) `(%rplaca (caddr ,x) ,v))
949 (defsetf cadddr (x) (v) `(%rplaca (cdddr ,x) ,v))
950 (defsetf cdaddr (x) (v) `(%rplacd (caddr ,x) ,v))
951 (defsetf cddddr (x) (v) `(%rplacd (cdddr ,x) ,v))
952
953 (defsetf first %rplaca)
954 (defsetf second (x) (v) `(%rplaca (cdr ,x) ,v))
955 (defsetf third (x) (v) `(%rplaca (cddr ,x) ,v))
956 (defsetf fourth (x) (v) `(%rplaca (cdddr ,x) ,v))
957 (defsetf fifth (x) (v) `(%rplaca (cddddr ,x) ,v))
958 (defsetf sixth (x) (v) `(%rplaca (cdr (cddddr ,x)) ,v))
959 (defsetf seventh (x) (v) `(%rplaca (cddr (cddddr ,x)) ,v))
960 (defsetf eighth (x) (v) `(%rplaca (cdddr (cddddr ,x)) ,v))
961 (defsetf ninth (x) (v) `(%rplaca (cddddr (cddddr ,x)) ,v))
962 (defsetf tenth (x) (v) `(%rplaca (cdr (cddddr (cddddr ,x))) ,v))
963 (defsetf rest %rplacd)
964
965 (defsetf elt %setelt)
966 (defsetf aref %aset)
967 (defsetf row-major-aref %set-row-major-aref)
968 (defsetf svref %svset)
969 (defsetf char %charset)
970 (defsetf bit %bitset)
971 (defsetf schar %scharset)
972 (defsetf sbit %sbitset)
973 (defsetf %array-dimension %set-array-dimension)
974 (defsetf %raw-bits %set-raw-bits)
975 (defsetf symbol-value set)
976 (defsetf symbol-function fset)
977 (defsetf symbol-plist %set-symbol-plist)
978 (defsetf nth %setnth)
979 (defsetf fill-pointer %set-fill-pointer)
980 (defsetf search-list %set-search-list)
981
982 (defsetf sap-ref-8 %set-sap-ref-8)
983 (defsetf signed-sap-ref-8 %set-signed-sap-ref-8)
984 (defsetf sap-ref-16 %set-sap-ref-16)
985 (defsetf signed-sap-ref-16 %set-signed-sap-ref-16)
986 (defsetf sap-ref-32 %set-sap-ref-32)
987 (defsetf signed-sap-ref-32 %set-signed-sap-ref-32)
988 (defsetf sap-ref-64 %set-sap-ref-64)
989 (defsetf signed-sap-ref-64 %set-signed-sap-ref-64)
990 (defsetf sap-ref-sap %set-sap-ref-sap)
991 (defsetf sap-ref-single %set-sap-ref-single)
992 (defsetf sap-ref-double %set-sap-ref-double)
993 #+long-float
994 (defsetf sap-ref-long %set-sap-ref-long)
995
996 (define-setf-expander getf (place prop &optional default &environment env)
997 (multiple-value-bind (temps values stores set get)
998 (get-setf-method place env)
999 (let ((newval (gensym))
1000 (ptemp (gensym))
1001 (def-temp (if default (gensym))))
1002 (values `(,@temps ,ptemp ,@(if default `(,def-temp)))
1003 `(,@values ,prop ,@(if default `(,default)))
1004 `(,newval)
1005 `(let ((,(car stores) (%putf ,get ,ptemp ,newval)))
1006 ,set
1007 ,newval)
1008 `(getf ,get ,ptemp ,@(if default `(,def-temp)))))))
1009
1010 (define-setf-expander get (symbol prop &optional default)
1011 (let ((symbol-temp (gensym))
1012 (prop-temp (gensym))
1013 (def-temp (gensym))
1014 (newval (gensym)))
1015 (values `(,symbol-temp ,prop-temp ,@(if default `(,def-temp)))
1016 `(,symbol ,prop ,@(if default `(,default)))
1017 (list newval)
1018 `(%put ,symbol-temp ,prop-temp ,newval)
1019 `(get ,symbol-temp ,prop-temp ,@(if default `(,def-temp))))))
1020
1021 (define-setf-expander gethash (key hashtable &optional default)
1022 (let ((key-temp (gensym))
1023 (hashtable-temp (gensym))
1024 (default-temp (gensym))
1025 (new-value-temp (gensym)))
1026 (values
1027 `(,key-temp ,hashtable-temp ,@(if default `(,default-temp)))
1028 `(,key ,hashtable ,@(if default `(,default)))
1029 `(,new-value-temp)
1030 `(%puthash ,key-temp ,hashtable-temp ,new-value-temp)
1031 `(gethash ,key-temp ,hashtable-temp ,@(if default `(,default-temp))))))
1032
1033 (defsetf subseq (sequence start &optional (end nil)) (v)
1034 `(progn (replace ,sequence ,v :start1 ,start :end1 ,end)
1035 ,v))
1036
1037
1038 ;;; Evil hack invented by the gnomes of Vassar Street (though not as evil as
1039 ;;; it used to be.) The function arg must be constant, and is converted to an
1040 ;;; APPLY of ther SETF function, which ought to exist.
1041 ;;;
1042 (define-setf-expander apply (function &rest args)
1043 (unless (and (listp function)
1044 (= (list-length function) 2)
1045 (eq (first function) 'function)
1046 (symbolp (second function)))
1047 (error "Setf of Apply is only defined for function args like #'symbol."))
1048 (let ((function (second function))
1049 (new-var (gensym))
1050 (vars nil))
1051 (dolist (x args)
1052 (declare (ignore x))
1053 (push (gensym) vars))
1054 (values vars args (list new-var)
1055 `(apply #'(setf ,function) ,new-var ,@vars)
1056 `(apply #',function ,@vars))))
1057
1058
1059 ;;; Special-case a BYTE bytespec so that the compiler can recognize it.
1060 ;;;
1061 (define-setf-expander ldb (bytespec place &environment env)
1062 "The first argument is a byte specifier. The second is any place form
1063 acceptable to SETF. Replaces the specified byte of the number in this
1064 place with bits from the low-order end of the new value."
1065 (multiple-value-bind (dummies vals newval setter getter)
1066 (get-setf-method place env)
1067 (if (and (consp bytespec) (eq (car bytespec) 'byte))
1068 (let ((n-size (gensym))
1069 (n-pos (gensym))
1070 (n-new (gensym)))
1071 (values (list* n-size n-pos dummies)
1072 (list* (second bytespec) (third bytespec) vals)
1073 (list n-new)
1074 `(let ((,(car newval) (dpb ,n-new (byte ,n-size ,n-pos)
1075 ,getter)))
1076 ,setter
1077 ,n-new)
1078 `(ldb (byte ,n-size ,n-pos) ,getter)))
1079 (let ((btemp (gensym))
1080 (gnuval (gensym)))
1081 (values (cons btemp dummies)
1082 (cons bytespec vals)
1083 (list gnuval)
1084 `(let ((,(car newval) (dpb ,gnuval ,btemp ,getter)))
1085 ,setter
1086 ,gnuval)
1087 `(ldb ,btemp ,getter))))))
1088
1089
1090 (define-setf-expander mask-field (bytespec place &environment env)
1091 "The first argument is a byte specifier. The second is any place form
1092 acceptable to SETF. Replaces the specified byte of the number in this place
1093 with bits from the corresponding position in the new value."
1094 (multiple-value-bind (dummies vals newval setter getter)
1095 (get-setf-method place env)
1096 (let ((btemp (gensym))
1097 (gnuval (gensym)))
1098 (values (cons btemp dummies)
1099 (cons bytespec vals)
1100 (list gnuval)
1101 `(let ((,(car newval) (deposit-field ,gnuval ,btemp ,getter)))
1102 ,setter
1103 ,gnuval)
1104 `(mask-field ,btemp ,getter)))))
1105
1106
1107 (define-setf-expander the (type place &environment env)
1108 (multiple-value-bind (dummies vals newval setter getter)
1109 (get-setf-method place env)
1110 (values dummies
1111 vals
1112 newval
1113 (subst `(the ,type ,(car newval)) (car newval) setter)
1114 `(the ,type ,getter))))
1115
1116 (define-setf-expander values (&rest places &environment env)
1117 (collect ((setters) (getters))
1118 (let ((all-dummies '())
1119 (all-vals '())
1120 (newvals '()))
1121 (dolist (place places)
1122 (multiple-value-bind (dummies vals newval setter getter)
1123 (get-setf-expansion place env)
1124 (setf all-dummies (append all-dummies dummies))
1125 (setf all-vals (append all-vals vals))
1126 (setf newvals (append newvals newval))
1127 (setters setter)
1128 (getters getter)))
1129 (values all-dummies all-vals newvals
1130 `(values ,@(setters)) `(values ,@(getters))))))
1131
1132
1133 ;;;; CASE, TYPECASE, & Friends.
1134
1135 (eval-when (compile load eval)
1136
1137 ;;; CASE-BODY returns code for all the standard "case" macros. Name is the
1138 ;;; macro name, and keyform is the thing to case on. Multi-p indicates whether
1139 ;;; a branch may fire off a list of keys; otherwise, a key that is a list is
1140 ;;; interpreted in some way as a single key. When multi-p, test is applied to
1141 ;;; the value of keyform and each key for a given branch; otherwise, test is
1142 ;;; applied to the value of keyform and the entire first element, instead of
1143 ;;; each part, of the case branch. When errorp, no t or otherwise branch is
1144 ;;; permitted, and an ERROR form is generated. When proceedp, it is an error
1145 ;;; to omit errorp, and the ERROR form generated is executed within a
1146 ;;; RESTART-CASE allowing keyform to be set and retested.
1147 ;;;
1148 (defun case-body (name keyform cases multi-p test errorp proceedp)
1149 (let ((keyform-value (gensym))
1150 (clauses ())
1151 (keys ()))
1152 (dolist (case cases)
1153 (cond ((atom case)
1154 (error "~S -- Bad clause in ~S." case name))
1155 ((memq (car case) '(t otherwise))
1156 (if errorp
1157 (error "No default clause allowed in ~S: ~S" name case)
1158 (push `(t nil ,@(rest case)) clauses)))
1159 ((and multi-p (listp (first case)))
1160 (setf keys (append (first case) keys))
1161 (push `((or ,@(mapcar #'(lambda (key)
1162 `(,test ,keyform-value ',key))
1163 (first case)))
1164 nil ,@(rest case))
1165 clauses))
1166 (t
1167 (push (first case) keys)
1168 (push `((,test ,keyform-value
1169 ',(first case)) nil ,@(rest case)) clauses))))
1170 (case-body-aux name keyform keyform-value clauses keys errorp proceedp
1171 `(,(if multi-p 'member 'or) ,@keys))))
1172
1173 ;;; CASE-BODY-AUX provides the expansion once CASE-BODY has groveled all the
1174 ;;; cases. Note: it is not necessary that the resulting code signal
1175 ;;; case-failure conditions, but that's what KMP's prototype code did. We call
1176 ;;; CASE-BODY-ERROR, because of how closures are compiled. RESTART-CASE has
1177 ;;; forms with closures that the compiler causes to be generated at the top of
1178 ;;; any function using the case macros, regardless of whether they are needed.
1179 ;;;
1180 (defun case-body-aux (name keyform keyform-value clauses keys
1181 errorp proceedp expected-type)
1182 (if proceedp
1183 (let ((block (gensym))
1184 (again (gensym)))
1185 `(let ((,keyform-value ,keyform))
1186 (block ,block
1187 (tagbody
1188 ,again
1189 (return-from
1190 ,block
1191 (cond ,@(nreverse clauses)
1192 (t
1193 (setf ,keyform-value
1194 (setf ,keyform
1195 (case-body-error
1196 ',name ',keyform ,keyform-value
1197 ',expected-type ',keys)))
1198 (go ,again))))))))
1199 `(let ((,keyform-value ,keyform))
1200 ,keyform-value ; prevent warnings when key not used eg (case key (t))
1201 (cond
1202 ,@(nreverse clauses)
1203 ,@(if errorp
1204 `((t (error 'conditions::case-failure
1205 :name ',name
1206 :datum ,keyform-value
1207 :expected-type ',expected-type
1208 :possibilities ',keys))))))))
1209
1210 ); eval-when
1211
1212 (defun case-body-error (name keyform keyform-value expected-type keys)
1213 (restart-case
1214 (error 'conditions::case-failure
1215 :name name
1216 :datum keyform-value
1217 :expected-type expected-type
1218 :possibilities keys)
1219 (store-value (value)
1220 :report (lambda (stream)
1221 (format stream "Supply a new value for ~S." keyform))
1222 :interactive read-evaluated-form
1223 value)))
1224
1225
1226 (defmacro case (keyform &body cases)
1227 "CASE Keyform {({(Key*) | Key} Form*)}*
1228 Evaluates the Forms in the first clause with a Key EQL to the value of
1229 Keyform. If a singleton key is T then the clause is a default clause."
1230 (case-body 'case keyform cases t 'eql nil nil))
1231
1232 (defmacro ccase (keyform &body cases)
1233 "CCASE Keyform {({(Key*) | Key} Form*)}*
1234 Evaluates the Forms in the first clause with a Key EQL to the value of
1235 Keyform. If none of the keys matches then a correctable error is
1236 signalled."
1237 (case-body 'ccase keyform cases t 'eql t t))
1238
1239 (defmacro ecase (keyform &body cases)
1240 "ECASE Keyform {({(Key*) | Key} Form*)}*
1241 Evaluates the Forms in the first clause with a Key EQL to the value of
1242 Keyform. If none of the keys matches then an error is signalled."
1243 (case-body 'ecase keyform cases t 'eql t nil))
1244
1245 (defmacro typecase (keyform &body cases)
1246 "TYPECASE Keyform {(Type Form*)}*
1247 Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1248 is true."
1249 (case-body 'typecase keyform cases nil 'typep nil nil))
1250
1251 (defmacro ctypecase (keyform &body cases)
1252 "CTYPECASE Keyform {(Type Form*)}*
1253 Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1254 is true. If no form is satisfied then a correctable error is signalled."
1255 (case-body 'ctypecase keyform cases nil 'typep t t))
1256
1257 (defmacro etypecase (keyform &body cases)
1258 "ETYPECASE Keyform {(Type Form*)}*
1259 Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1260 is true. If no form is satisfied then an error is signalled."
1261 (case-body 'etypecase keyform cases nil 'typep t nil))
1262
1263
1264 ;;;; ASSERT and CHECK-TYPE.
1265
1266 ;;; ASSERT is written this way, to call ASSERT-ERROR, because of how closures
1267 ;;; are compiled. RESTART-CASE has forms with closures that the compiler
1268 ;;; causes to be generated at the top of any function using ASSERT, regardless
1269 ;;; of whether they are needed.
1270 ;;;
1271 (defmacro assert (test-form &optional places datum &rest arguments)
1272 "Signals an error if the value of test-form is nil. Continuing from this
1273 error using the CONTINUE restart will allow the user to alter the value of
1274 some locations known to SETF, starting over with test-form. Returns nil."
1275 `(loop
1276 (when ,test-form (return nil))
1277 (assert-error ',test-form ',places ,datum ,@arguments)
1278 ,@(mapcar #'(lambda (place)
1279 `(setf ,place (assert-prompt ',place ,place)))
1280 places)))
1281
1282 (defun assert-error (assertion places datum &rest arguments)
1283 (let ((cond (if datum
1284 (conditions::coerce-to-condition
1285 datum arguments
1286 'simple-error 'error)
1287 (make-condition 'simple-error
1288 :format-control "The assertion ~S failed."
1289 :format-arguments (list assertion)))))
1290 (restart-case (error cond)
1291 (continue ()
1292 :report (lambda (stream) (assert-report places stream))
1293 nil))))
1294
1295
1296 (defun assert-report (names stream)
1297 (format stream "Retry assertion")
1298 (if names
1299 (format stream " with new value~P for ~{~S~^, ~}."
1300 (length names) names)
1301 (format stream ".")))
1302
1303 (defun assert-prompt (name value)
1304 (cond ((y-or-n-p "The old value of ~S is ~S.~
1305 ~%Do you want to supply a new value? "
1306 name value)
1307 (format *query-io* "~&Type a form to be evaluated:~%")
1308 (flet ((read-it () (eval (read *query-io*))))
1309 (if (symbolp name) ;help user debug lexical variables
1310 (progv (list name) (list value) (read-it))
1311 (read-it))))
1312 (t value)))
1313
1314
1315 ;;; CHECK-TYPE is written this way, to call CHECK-TYPE-ERROR, because of how
1316 ;;; closures are compiled. RESTART-CASE has forms with closures that the
1317 ;;; compiler causes to be generated at the top of any function using
1318 ;;; CHECK-TYPE, regardless of whether they are needed. Because it would be
1319 ;;; nice if this were cheap to use, and some things can't afford this excessive
1320 ;;; consing (e.g., READ-CHAR), we bend backwards a little.
1321 ;;;
1322
1323 (defmacro check-type (place type &optional type-string)
1324 "Signals an error of type type-error if the contents of place are not of the
1325 specified type. If an error is signaled, this can only return if
1326 STORE-VALUE is invoked. It will store into place and start over."
1327 (let ((place-value (gensym)))
1328 `(loop
1329 (let ((,place-value ,place))
1330 (when (typep ,place-value ',type) (return nil))
1331 (setf ,place
1332 (check-type-error ',place ,place-value ',type ,type-string))))))
1333
1334 (defun check-type-error (place place-value type type-string)
1335 (let ((cond (if type-string
1336 (make-condition 'simple-type-error
1337 :datum place :expected-type type
1338 :format-control
1339 "The value of ~S is ~S, which is not ~A."
1340 :format-arguments
1341 (list place place-value type-string))
1342 (make-condition 'simple-type-error
1343 :datum place :expected-type type
1344 :format-control
1345 "The value of ~S is ~S, which is not of type ~S."
1346 :format-arguments
1347 (list place place-value type)))))
1348 (restart-case (error cond)
1349 (store-value (value)
1350 :report (lambda (stream)
1351 (format stream "Supply a new value of ~S."
1352 place))
1353 :interactive read-evaluated-form
1354 value))))
1355
1356 ;;; READ-EVALUATED-FORM is used as the interactive method for restart cases
1357 ;;; setup by the Common Lisp "casing" (e.g., CCASE and CTYPECASE) macros
1358 ;;; and by CHECK-TYPE.
1359 ;;;
1360 (defun read-evaluated-form ()
1361 (format *query-io* "~&Type a form to be evaluated:~%")
1362 (list (eval (read *query-io*))))
1363
1364
1365 ;;;; With-XXX
1366 (defmacro with-open-file ((var &rest open-args) &body (forms decls))
1367 "Bindspec is of the form (Stream File-Name . Options). The file whose
1368 name is File-Name is opened using the Options and bound to the variable
1369 Stream. If the call to open is unsuccessful, the forms are not
1370 evaluated. The Forms are executed, and when they
1371 terminate, normally or otherwise, the file is closed."
1372 (let ((abortp (gensym)))
1373 `(let ((,var (open ,@open-args))
1374 (,abortp t))
1375 ,@decls
1376 (unwind-protect
1377 (multiple-value-prog1
1378 (progn ,@forms)
1379 (setq ,abortp nil))
1380 (when ,var
1381 (close ,var :abort ,abortp))))))
1382
1383
1384 (defmacro with-open-stream ((var stream) &body (forms decls))
1385 "The form stream should evaluate to a stream. VAR is bound
1386 to the stream and the forms are evaluated as an implicit
1387 progn. The stream is closed upon exit."
1388 (let ((abortp (gensym)))
1389 `(let ((,var ,stream)
1390 (,abortp t))
1391 ,@decls
1392 (unwind-protect
1393 (multiple-value-prog1
1394 (progn ,@forms)
1395 (setq ,abortp nil))
1396 (when ,var
1397 (close ,var :abort ,abortp))))))
1398
1399
1400 (defmacro with-input-from-string ((var string &key index start end) &body (forms decls))
1401 "Binds the Var to an input stream that returns characters from String and
1402 executes the body. See manual for details."
1403 ;; The once-only inhibits compiler note for unreachable code when 'end' is true.
1404 (once-only ((string string))
1405 `(let ((,var
1406 ,(cond ((null end)
1407 `(make-string-input-stream ,string ,(or start 0)))
1408 ((symbolp end)
1409 `(if ,end
1410 (make-string-input-stream ,string ,(or start 0) ,end)
1411 (make-string-input-stream ,string ,(or start 0))))
1412 (t
1413 `(make-string-input-stream ,string ,(or start 0) ,end)))))
1414 ,@decls
1415 (unwind-protect
1416 (progn ,@forms)
1417 (close ,var)
1418 ,@(if index `((setf ,index (string-input-stream-current ,var))))))))
1419
1420
1421 (defmacro with-output-to-string ((var &optional string) &body (forms decls))
1422 "If *string* is specified, it must be a string with a fill pointer;
1423 the output is incrementally appended to the string (as if by use of
1424 VECTOR-PUSH-EXTEND)."
1425 (if string
1426 `(let ((,var (make-fill-pointer-output-stream ,string)))
1427 ,@decls
1428 (unwind-protect
1429 (progn ,@forms)
1430 (close ,var)))
1431 `(let ((,var (make-string-output-stream)))
1432 ,@decls
1433 (unwind-protect
1434 (progn ,@forms)
1435 (close ,var))
1436 (get-output-stream-string ,var))))
1437
1438
1439 ;;;; Iteration macros:
1440
1441 (defmacro dotimes ((var count &optional (result nil)) &body body)
1442 (cond ((numberp count)
1443 `(do ((,var 0 (1+ ,var)))
1444 ((>= ,var ,count) ,result)
1445 (declare (type unsigned-byte ,var))
1446 ,@body))
1447 (t (let ((v1 (gensym)))
1448 `(do ((,var 0 (1+ ,var)) (,v1 ,count))
1449 ((>= ,var ,v1) ,result)
1450 (declare (type unsigned-byte ,var))
1451 ,@body)))))
1452
1453
1454 ;;; We repeatedly bind the var instead of setting it so that we never give the
1455 ;;; var a random value such as NIL (which might conflict with a declaration).
1456 ;;; If there is a result form, we introduce a gratitous binding of the variable
1457 ;;; to NIL w/o the declarations, then evaluate the result form in that
1458 ;;; environment. We spuriously reference the gratuitous variable, since we
1459 ;;; don't want to use IGNORABLE on what might be a special var.
1460 ;;;
1461 (defmacro dolist ((var list &optional (result nil)) &body body)
1462 (let ((n-list (gensym)))
1463 `(do ((,n-list ,list (cdr ,n-list)))
1464 ((endp ,n-list)
1465 ,@(if result
1466 `((let ((,var nil))
1467 ,var
1468 ,result))
1469 '(nil)))
1470 (let ((,var (car ,n-list)))
1471 ,@body))))
1472
1473
1474 (defmacro do (varlist endlist &body (body decls))
1475 "DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
1476 Iteration construct. Each Var is initialized in parallel to the value of the
1477 specified Init form. On subsequent iterations, the Vars are assigned the
1478 value of the Step form (if any) in paralell. The Test is evaluated before
1479 each evaluation of the body Forms. When the Test is true, the Exit-Forms
1480 are evaluated as a PROGN, with the result being the value of the DO. A block
1481 named NIL is established around the entire expansion, allowing RETURN to be
1482 used as an laternate exit mechanism."
1483
1484 (do-do-body varlist endlist body decls 'let 'psetq 'do nil))
1485
1486
1487 (defmacro do* (varlist endlist &body (body decls))
1488 "DO* ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
1489 Iteration construct. Each Var is initialized sequentially (like LET*) to the
1490 value of the specified Init form. On subsequent iterations, the Vars are
1491 sequentially assigned the value of the Step form (if any). The Test is
1492 evaluated before each evaluation of the body Forms. When the Test is true,
1493 the Exit-Forms are evaluated as a PROGN, with the result being the value
1494 of the DO. A block named NIL is established around the entire expansion,
1495 allowing RETURN to be used as an laternate exit mechanism."
1496 (do-do-body varlist endlist body decls 'let* 'setq 'do* nil))
1497
1498
1499 ;;;; Miscellaneous macros:
1500
1501 (defmacro locally (&rest forms)
1502 "A form providing a container for locally-scoped variables."
1503 `(let () ,@forms))
1504
1505 (defmacro psetq (&rest pairs)
1506 (do ((lets nil)
1507 (setqs nil)
1508 (pairs pairs (cddr pairs)))
1509 ((atom (cdr pairs))
1510 `(let ,(nreverse lets) (setq ,@(nreverse setqs)) nil))
1511 (let ((gen (gensym)))
1512 (push `(,gen ,(cadr pairs)) lets)
1513 (push (car pairs) setqs)
1514 (push gen setqs))))
1515
1516 ;;; LAMBDA -- from the ANSI spec.
1517 ;;;
1518 (defmacro lambda (&whole form &rest bvl-decls-and-body)
1519 (declare (ignore bvl-decls-and-body))
1520 `#',form)
1521
1522
1523
1524 ;;;; With-Compilation-Unit:
1525
1526 ;;; True if we are within a With-Compilation-Unit form, which normally causes
1527 ;;; nested uses to be NOOPS.
1528 ;;;
1529 (defvar *in-compilation-unit* nil)
1530
1531 ;;; Count of the number of compilation units dynamically enclosed by the
1532 ;;; current active WITH-COMPILATION-UNIT that were unwound out of.
1533 ;;;
1534 (defvar *aborted-compilation-units*)
1535
1536 (declaim (special c::*context-declarations*))
1537
1538
1539 ;;; EVALUATE-DECLARATION-CONTEXT -- Internal
1540 ;;;
1541 ;;; Recursively descend the context form, returning true if this subpart
1542 ;;; matches the specified context.
1543 ;;;
1544 (defun evaluate-declaration-context (context name parent)
1545 (let* ((base (if (and (consp name) (consp (cdr name)))
1546 (cadr name)
1547 name))
1548 (package (and (symbolp base) (symbol-package base))))
1549 (if (atom context)
1550 (multiple-value-bind (ignore how)
1551 (if package
1552 (find-symbol (symbol-name base) package)
1553 (values nil nil))
1554 (declare (ignore ignore))
1555 (case context
1556 (:internal (eq how :internal))
1557 (:external (eq how :external))
1558 (:uninterned (and (symbolp base) (not package)))
1559 (:anonymous (not name))
1560 (:macro (eq parent 'defmacro))
1561 (:function (member parent '(defun labels flet function)))
1562 (:global (member parent '(defun defmacro function)))
1563 (:local (member parent '(labels flet)))
1564 (t
1565 (error "Unknown declaration context: ~S." context))))
1566 (case (first context)
1567 (:or
1568 (loop for x in (rest context)
1569 thereis (evaluate-declaration-context x name parent)))
1570 (:and
1571 (loop for x in (rest context)
1572 always (evaluate-declaration-context x name parent)))
1573 (:not
1574 (evaluate-declaration-context (second context) name parent))
1575 (:member
1576 (member name (rest context) :test #'equal))
1577 (:match
1578 (let ((name (concatenate 'string "$" (string base) "$")))
1579 (loop for x in (rest context)
1580 thereis (search (string x) name))))
1581 (:package
1582 (and package
1583 (loop for x in (rest context)
1584 thereis (eq (find-package (string x)) package))))
1585 (t
1586 (error "Unknown declaration context: ~S." context))))))
1587
1588
1589 ;;; PROCESS-CONTEXT-DECLARATIONS -- Internal
1590 ;;;
1591 ;;; Given a list of context declaration specs, return a new value for
1592 ;;; C::*CONTEXT-DECLARATIONS*.
1593 ;;;
1594 (defun process-context-declarations (decls)
1595 (append
1596 (mapcar
1597 #'(lambda (decl)
1598 (unless (>= (length decl) 2)
1599 (error "Context declaration spec should have context and at ~
1600 least one DECLARE form:~% ~S" decl))
1601 #'(lambda (name parent)
1602 (when (evaluate-declaration-context (first decl) name parent)
1603 (rest decl))))
1604 decls)
1605 c::*context-declarations*))
1606
1607
1608 ;;; With-Compilation-Unit -- Public
1609 ;;;
1610 (defmacro with-compilation-unit (options &body body)
1611 "WITH-COMPILATION-UNIT ({Key Value}*) Form*
1612 This form affects compilations that take place within its dynamic extent. It
1613 is intended to be wrapped around the compilation of all files in the same
1614 system. These keywords are defined:
1615 :OVERRIDE Boolean-Form
1616 One of the effects of this form is to delay undefined warnings
1617 until the end of the form, instead of giving them at the end of each
1618 compilation. If OVERRIDE is NIL (the default), then the outermost
1619 WITH-COMPILATION-UNIT form grabs the undefined warnings. Specifying
1620 OVERRIDE true causes that form to grab any enclosed warnings, even if
1621 it is enclosed by another WITH-COMPILATION-UNIT.
1622 :OPTIMIZE Decl-Form
1623 Decl-Form should evaluate to an OPTIMIZE declaration specifier. This
1624 declaration changes the `global' policy for compilations within the
1625 body.
1626 :OPTIMIZE-INTERFACE Decl-Form
1627 Like OPTIMIZE, except that it specifies the value of the CMU extension
1628 OPTIMIZE-INTERFACE policy (which controls argument type and syntax
1629 checking.)
1630 :CONTEXT-DECLARATIONS List-of-Context-Decls-Form
1631 This is a CMU extension which allows compilation to be controlled
1632 by pattern matching on the context in which a definition appears. The
1633 argument should evaluate to a list of lists of the form:
1634 (Context-Spec Declare-Form+)
1635 In the indicated context, the specified declare forms are inserted at
1636 the head of each definition. The declare forms for all contexts that
1637 match are appended together, with earlier declarations getting
1638 predecence over later ones. A simple example:
1639 :context-declarations
1640 '((:external (declare (optimize (safety 2)))))
1641 This will cause all functions that are named by external symbols to be
1642 compiled with SAFETY 2. The full syntax of context specs is:
1643 :INTERNAL, :EXTERNAL
1644 True if the symbols is internal (external) in its home package.
1645 :UNINTERNED
1646 True if the symbol has no home package.
1647 :ANONYMOUS
1648 True if the function doesn't have any interesting name (not
1649 DEFMACRO, DEFUN, LABELS or FLET).
1650 :MACRO, :FUNCTION
1651 :MACRO is a global (DEFMACRO) macro. :FUNCTION is anything else.
1652 :LOCAL, :GLOBAL
1653 :LOCAL is a LABELS or FLET. :GLOBAL is anything else.
1654 (:OR Context-Spec*)
1655 True in any specified context.
1656 (:AND Context-Spec*)
1657 True only when all specs are true.
1658 (:NOT Context-Spec)
1659 True when the spec is false.
1660 (:MEMBER Name*)
1661 True when the name is one of these names (EQUAL test.)
1662 (:MATCH Pattern*)
1663 True when any of the patterns is a substring of the name. The name
1664 is wrapped with $'s, so $FOO matches names beginning with FOO,
1665 etc."
1666 (let ((override nil)
1667 (optimize nil)
1668 (optimize-interface nil)
1669 (context-declarations nil)
1670 (n-fun (gensym))
1671 (n-abort-p (gensym)))
1672 (when (oddp (length options))
1673 (error "Odd number of key/value pairs: ~S." options))
1674 (do ((opt options (cddr opt)))
1675 ((null opt))
1676 (case (first opt)
1677 (:override
1678 (setq override (second opt)))
1679 (:optimize
1680 (setq optimize (second opt)))
1681 (:optimize-interface
1682 (setq optimize-interface (second opt)))
1683 (:context-declarations
1684 (setq context-declarations (second opt)))
1685 (t
1686 (warn "Ignoring unknown option: ~S." (first opt)))))
1687
1688 `(flet ((,n-fun ()
1689 (let (,@(when optimize
1690 `((c::*default-cookie*
1691 (c::process-optimize-declaration
1692 ,optimize c::*default-cookie*))))
1693 ,@(when optimize-interface
1694 `((c::*default-interface-cookie*
1695 (c::process-optimize-declaration
1696 ,optimize-interface
1697 c::*default-interface-cookie*))))
1698 ,@(when context-declarations
1699 `((c::*context-declarations*
1700 (process-context-declarations
1701 ,context-declarations)))))
1702 ,@body)))
1703 (if (or ,override (not *in-compilation-unit*))
1704 (let ((c::*undefined-warnings* nil)
1705 (c::*compiler-error-count* 0)
1706 (c::*compiler-warning-count* 0)
1707 (c::*compiler-note-count* 0)
1708 (*in-compilation-unit* t)
1709 (*aborted-compilation-units* 0)
1710 (,n-abort-p t))
1711 (handler-bind ((c::parse-unknown-type
1712 #'(lambda (c)
1713 (c::note-undefined-reference
1714 (c::parse-unknown-type-specifier c)
1715 :type))))
1716 (unwind-protect
1717 (multiple-value-prog1
1718 (,n-fun)
1719 (setq ,n-abort-p nil))
1720 (c::print-summary ,n-abort-p *aborted-compilation-units*))))
1721 (let ((,n-abort-p t))
1722 (unwind-protect
1723 (multiple-value-prog1
1724 (,n-fun)
1725 (setq ,n-abort-p nil))
1726 (when ,n-abort-p
1727 (incf *aborted-compilation-units*))))))))

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