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Revision 1.35 - (hide annotations)
Tue Sep 1 17:41:52 1992 UTC (21 years, 7 months ago) by ram
Branch: MAIN
Branch point for: new_struct
Changes since 1.34: +10 -5 lines
Changed DOLIST not to introduce the spurious let around the result form when
there is no result form.  Also, just read the var in the spurious let, instead
of using IGNORABLE, since the var might be special.
1 ram 1.1 ;;; -*- Log: code.log; Package: Lisp -*-
2     ;;;
3     ;;; **********************************************************************
4 ram 1.20 ;;; 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     ;;; If you want to use this code or any part of CMU Common Lisp, please contact
7     ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
8     ;;;
9     (ext:file-comment
10 ram 1.35 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/macros.lisp,v 1.35 1992/09/01 17:41:52 ram Exp $")
11 ram 1.20 ;;;
12 ram 1.1 ;;; **********************************************************************
13     ;;;
14     ;;; This file contains the macros that are part of the standard
15     ;;; Spice Lisp environment.
16     ;;;
17     ;;; Written by Scott Fahlman and Rob MacLachlan.
18 ram 1.22 ;;; Modified by Bill Chiles to adhere to the wall.
19 ram 1.1 ;;;
20 wlott 1.10 (in-package "LISP")
21 wlott 1.13 (export '(defvar defparameter defconstant when unless setf
22 ram 1.1 defsetf define-setf-method psetf shiftf rotatef push pushnew pop
23     incf decf remf case typecase with-open-file
24     with-open-stream with-input-from-string with-output-to-string
25     locally etypecase ctypecase ecase ccase
26     get-setf-method get-setf-method-multiple-value
27 ram 1.18 define-modify-macro destructuring-bind nth-value
28 wlott 1.33 otherwise ; Sacred to CASE and related macros.
29     define-compiler-macro))
30 ram 1.1
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 wlott 1.13 (let ((whole (gensym "WHOLE-"))
79     (environment (gensym "ENV-")))
80 ram 1.1 (multiple-value-bind
81     (body local-decs doc)
82 wlott 1.13 (parse-defmacro lambda-list whole body name 'defmacro
83     :environment environment)
84 ram 1.1 (let ((def `(lambda (,whole ,environment)
85     ,@local-decs
86     (block ,name
87     ,body))))
88 wlott 1.13 `(c::%defmacro ',name #',def ',lambda-list ,doc)))))
89 ram 1.1
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 wlott 1.13 (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 ram 1.1 (c::%%defmacro name definition doc))
108     ;;;
109     (defun c::%%defmacro (name definition doc)
110     (clear-info function where-from name)
111 wlott 1.10 (setf (macro-function name) definition)
112 ram 1.1 (setf (documentation name 'function) doc)
113     name)
114 wlott 1.33
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 ram 1.1
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 wlott 1.13 (let ((whole (gensym "WHOLE-")))
156 ram 1.1 (multiple-value-bind (body local-decs doc)
157 wlott 1.13 (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 ram 1.7 ;;;
166     (defun %deftype (name expander &optional doc)
167 ram 1.12 (ecase (info type kind name)
168     (:primitive
169     (error "Illegal to redefine standard type: ~S." name))
170     (:structure
171     (warn "Redefining structure type ~S with DEFTYPE." name)
172     (c::undefine-structure (info type structure-info name)))
173     ((nil :defined)))
174 wlott 1.13 (setf (info type kind name) :defined)
175     (setf (info type expander name) expander)
176 ram 1.7 (when doc
177     (setf (documentation name 'type) doc))
178 wlott 1.10 ;; ### Bootstrap hack -- we need to define types before %note-type-defined
179     ;; is defined.
180 ram 1.12 (when (fboundp 'c::%note-type-defined)
181 wlott 1.10 (c::%note-type-defined name))
182 ram 1.7 name)
183    
184 ram 1.1
185     ;;; And so is DEFINE-SETF-METHOD.
186    
187     (defparameter defsetf-error-string "Setf expander for ~S cannot be called with ~S args.")
188    
189     (defmacro define-setf-method (access-fn lambda-list &body body)
190     "Syntax like DEFMACRO, but creates a Setf-Method generator. The body
191     must be a form that returns the five magical values."
192     (unless (symbolp access-fn)
193     (error "~S -- Access-function name not a symbol in DEFINE-SETF-METHOD."
194     access-fn))
195    
196 wlott 1.13 (let ((whole (gensym "WHOLE-"))
197     (environment (gensym "ENV-")))
198 ram 1.1 (multiple-value-bind (body local-decs doc)
199     (parse-defmacro lambda-list whole body access-fn
200 wlott 1.13 'define-setf-method
201     :environment environment)
202 ram 1.1 `(eval-when (load compile eval)
203 ram 1.22 (%define-setf-macro
204     ',access-fn
205     #'(lambda (,whole ,environment)
206     ,@local-decs
207     (block ,access-fn ,body))
208     nil
209     ',doc)))))
210 ram 1.1
211 ram 1.22
212     ;;; %DEFINE-SETF-MACRO -- Internal
213     ;;;
214     ;;; Do stuff for defining a setf macro.
215     ;;;
216     (defun %define-setf-macro (name expander inverse doc)
217     (cond ((not (fboundp `(setf ,name))))
218     ((info function accessor-for name)
219     (warn "Defining setf macro for destruct slot accessor; redefining as ~
220     a normal function:~% ~S"
221     name)
222     (c::define-function-name name))
223     ((not (eq (symbol-package name) (symbol-package 'aref)))
224     (warn "Defining setf macro for ~S, but ~S is fbound."
225     name `(setf ,name))))
226     (when (or inverse (info setf inverse name))
227     (setf (info setf inverse name) inverse))
228     (when (or expander (info setf expander name))
229     (setf (info setf expander name) expander))
230     (when doc
231     (setf (documentation name 'setf) doc))
232     name)
233    
234 wlott 1.13
235     ;;;; Destructuring-bind
236 ram 1.1
237 wlott 1.13 (defmacro destructuring-bind (lambda-list arg-list &rest body)
238     "Bind the variables in LAMBDA-LIST to the contents of ARG-LIST."
239     (let* ((arg-list-name (gensym "ARG-LIST-")))
240     (multiple-value-bind
241 wlott 1.14 (body local-decls)
242 wlott 1.17 (parse-defmacro lambda-list arg-list-name body nil 'destructuring-bind
243 wlott 1.13 :annonymousp t :doc-string-allowed nil)
244     `(let ((,arg-list-name ,arg-list))
245 wlott 1.14 ,@local-decls
246 wlott 1.13 ,body))))
247    
248 ram 1.1
249     ;;;; Defun, Defvar, Defparameter, Defconstant:
250    
251     ;;; Defun -- Public
252     ;;;
253     ;;; Very similar to Defmacro, but simpler. We don't have to parse the
254     ;;; lambda-list.
255     ;;;
256 wlott 1.13 (defmacro defun (&whole source name lambda-list &body (body decls doc))
257 ram 1.1 (let ((def `(lambda ,lambda-list
258     ,@decls
259     (block ,(if (and (consp name) (eq (car name) 'setf))
260     (cadr name)
261     name)
262     ,@body))))
263     `(c::%defun ',name #',def ,doc ',source)))
264    
265    
266     ;;; %Defun, %%Defun -- Internal
267     ;;;
268     ;;; Similar to %Defmacro, ...
269     ;;;
270     (defun c::%%defun (name def doc &optional inline-expansion)
271     (setf (fdefinition name) def)
272     (when doc
273     (if (and (consp name) (eq (first name) 'setf))
274     (setf (documentation (second name) 'setf) doc)
275     (setf (documentation name 'function) doc)))
276 ram 1.12 (c::define-function-name name)
277     (when (eq (info function where-from name) :assumed)
278     (setf (info function where-from name) :defined)
279     (when (info function assumed-type name)
280     (setf (info function assumed-type name) nil)))
281 ram 1.1 (when (or inline-expansion
282     (info function inline-expansion name))
283     (setf (info function inline-expansion name) inline-expansion))
284     name)
285     ;;;
286     (defun c::%defun (name def doc source)
287     (declare (ignore source))
288 ram 1.3 (assert (eval:interpreted-function-p def))
289     (setf (eval:interpreted-function-name def) name)
290 ram 1.1 (c::%%defun name def doc))
291    
292    
293     ;;; DEFCONSTANT -- Public
294     ;;;
295     (defmacro defconstant (var val &optional doc)
296     "For defining global constants at top level. The DEFCONSTANT says that the
297     value is constant and may be compiled into code. If the variable already has
298     a value, and this is not equal to the init, an error is signalled. The third
299     argument is an optional documentation string for the variable."
300     `(c::%defconstant ',var ,val ',doc))
301    
302     ;;; %Defconstant, %%Defconstant -- Internal
303     ;;;
304     ;;; Like the other %mumbles except that we currently actually do something
305     ;;; interesting at load time, namely checking if the constant is being
306     ;;; redefined.
307     ;;;
308     (defun c::%defconstant (name value doc)
309     (c::%%defconstant name value doc))
310     ;;;
311     (defun c::%%defconstant (name value doc)
312     (when doc
313     (setf (documentation name 'variable) doc))
314     (when (boundp name)
315     (unless (equalp (symbol-value name) value)
316     (cerror "Go ahead and change the value."
317     "Constant ~S being redefined." name)))
318     (setf (symbol-value name) value)
319     (setf (info variable kind name) :constant)
320     (clear-info variable constant-value name)
321     name)
322    
323    
324     (defmacro defvar (var &optional (val nil valp) (doc nil docp))
325     "For defining global variables at top level. Declares the variable
326     SPECIAL and, optionally, initializes it. If the variable already has a
327     value, the old value is not clobbered. The third argument is an optional
328     documentation string for the variable."
329     `(progn
330     (proclaim '(special ,var))
331     ,@(when valp
332     `((unless (boundp ',var)
333     (setq ,var ,val))))
334     ,@(when docp
335     `((setf (documentation ',var 'variable) ',doc)))
336     ',var))
337    
338     (defmacro defparameter (var val &optional (doc nil docp))
339     "Defines a parameter that is not normally changed by the program,
340     but that may be changed without causing an error. Declares the
341     variable special and sets its value to VAL. The third argument is
342     an optional documentation string for the parameter."
343     `(progn
344     (proclaim '(special ,var))
345     (setq ,var ,val)
346     ,@(when docp
347     `((setf (documentation ',var 'variable) ',doc)))
348     ',var))
349    
350    
351     ;;;; ASSORTED CONTROL STRUCTURES
352    
353    
354     (defmacro when (test &body forms)
355     "First arg is a predicate. If it is non-null, the rest of the forms are
356     evaluated as a PROGN."
357     `(cond (,test nil ,@forms)))
358    
359     (defmacro unless (test &rest forms)
360     "First arg is a predicate. If it is null, the rest of the forms are
361     evaluated as a PROGN."
362     `(cond ((not ,test) nil ,@forms)))
363    
364    
365     (defmacro return (&optional (value nil))
366     `(return-from nil ,value))
367    
368     (defmacro prog (varlist &body (body decls))
369     `(block nil
370     (let ,varlist
371     ,@decls
372     (tagbody ,@body))))
373    
374     (defmacro prog* (varlist &body (body decls))
375     `(block nil
376     (let* ,varlist
377     ,@decls
378     (tagbody ,@body))))
379    
380    
381     ;;; Prog1, Prog2 -- Public
382     ;;;
383     ;;; These just turn into a Let.
384     ;;;
385     (defmacro prog1 (result &rest body)
386     (let ((n-result (gensym)))
387     `(let ((,n-result ,result))
388     ,@body
389     ,n-result)))
390     ;;;
391     (defmacro prog2 (form1 result &rest body)
392     `(prog1 (progn ,form1 ,result) ,@body))
393    
394    
395     ;;; And, Or -- Public
396     ;;;
397     ;;; AND and OR are defined in terms of IF.
398     ;;;
399     (defmacro and (&rest forms)
400     (cond ((endp forms) t)
401     ((endp (rest forms)) (first forms))
402     (t
403     `(if ,(first forms)
404     (and ,@(rest forms))
405     nil))))
406     ;;;
407     (defmacro or (&rest forms)
408     (cond ((endp forms) nil)
409     ((endp (rest forms)) (first forms))
410     (t
411     (let ((n-result (gensym)))
412     `(let ((,n-result ,(first forms)))
413     (if ,n-result
414     ,n-result
415     (or ,@(rest forms))))))))
416    
417    
418     ;;; Cond -- Public
419     ;;;
420     ;;; COND also turns into IF.
421     ;;;
422     (defmacro cond (&rest clauses)
423     (if (endp clauses)
424     nil
425     (let ((clause (first clauses)))
426     (when (atom clause)
427     (error "Cond clause is not a list: ~S." clause))
428     (let ((test (first clause))
429     (forms (rest clause)))
430     (if (endp forms)
431     (let ((n-result (gensym)))
432     `(let ((,n-result ,test))
433     (if ,n-result
434     ,n-result
435     (cond ,@(rest clauses)))))
436     `(if ,test
437     (progn ,@forms)
438     (cond ,@(rest clauses))))))))
439    
440    
441     ;;;; Multiple value macros:
442    
443     ;;; Multiple-Value-XXX -- Public
444     ;;;
445     ;;; All the multiple-value receiving forms are defined in terms of
446     ;;; Multiple-Value-Call.
447     ;;;
448     (defmacro multiple-value-setq (varlist value-form)
449     (unless (and (listp varlist) (every #'symbolp varlist))
450     (error "Varlist is not a list of symbols: ~S." varlist))
451     (let ((temps (mapcar #'(lambda (x) (declare (ignore x)) (gensym)) varlist)))
452     `(multiple-value-bind ,temps ,value-form
453     ,@(mapcar #'(lambda (var temp)
454     `(setq ,var ,temp))
455     varlist temps)
456     ,(car temps))))
457     ;;;
458     (defmacro multiple-value-bind (varlist value-form &body body)
459     (unless (and (listp varlist) (every #'symbolp varlist))
460     (error "Varlist is not a list of symbols: ~S." varlist))
461     (if (= (length varlist) 1)
462     `(let ((,(car varlist) ,value-form))
463     ,@body)
464     (let ((ignore (gensym)))
465     `(multiple-value-call #'(lambda (&optional ,@varlist &rest ,ignore)
466     (declare (ignore ,ignore))
467     ,@body)
468     ,value-form))))
469     ;;;
470     (defmacro multiple-value-list (value-form)
471     `(multiple-value-call #'list ,value-form))
472 ram 1.18
473    
474     (defmacro nth-value (n form)
475     "Evaluates FORM and returns the Nth value (zero based). This involves no
476     consing when N is a trivial constant integer."
477     (if (integerp n)
478     (let ((dummy-list nil)
479 wlott 1.30 (keeper (gensym "KEEPER-")))
480 ram 1.26 ;; We build DUMMY-LIST, a list of variables to bind to useless
481     ;; values, then we explicitly IGNORE those bindings and return
482 wlott 1.30 ;; KEEPER, the only thing we're really interested in right now.
483 ram 1.26 (dotimes (i n)
484 wlott 1.30 (push (gensym "IGNORE-") dummy-list))
485     `(multiple-value-bind (,@dummy-list ,keeper)
486 ram 1.26 ,form
487     (declare (ignore ,@dummy-list))
488 wlott 1.30 ,keeper))
489     (once-only ((n n))
490     `(case (the fixnum ,n)
491     (0 (nth-value 0 ,form))
492     (1 (nth-value 1 ,form))
493     (2 (nth-value 2 ,form))
494     (T (nth (the fixnum ,n) (multiple-value-list ,form)))))))
495 ram 1.1
496    
497     ;;;; SETF and friends.
498    
499     ;;; Note: The expansions for SETF and friends sometimes create needless
500     ;;; LET-bindings of argument values. The compiler will remove most of
501     ;;; these spurious bindings, so SETF doesn't worry too much about creating
502     ;;; them.
503    
504     ;;; The inverse for a generalized-variable reference function is stored in
505     ;;; one of two ways:
506     ;;;
507     ;;; A SETF-INVERSE property corresponds to the short form of DEFSETF. It is
508     ;;; the name of a function takes the same args as the reference form, plus a
509     ;;; new-value arg at the end.
510     ;;;
511     ;;; A SETF-METHOD-EXPANDER property is created by the long form of DEFSETF or
512     ;;; by DEFINE-SETF-METHOD. It is a function that is called on the reference
513     ;;; form and that produces five values: a list of temporary variables, a list
514     ;;; of value forms, a list of the single store-value form, a storing function,
515     ;;; and an accessing function.
516    
517 wlott 1.29 (defun get-setf-method-multiple-value (form &optional environment)
518 ram 1.1 "Returns five values needed by the SETF machinery: a list of temporary
519 wlott 1.29 variables, a list of values with which to fill them, a list of temporaries
520     for the new values, the setting function, and the accessing function."
521 ram 1.1 (let (temp)
522     (cond ((symbolp form)
523 wlott 1.32 (multiple-value-bind
524     (expansion expanded)
525     (macroexpand-1 form environment)
526     (if expanded
527     (get-setf-method-multiple-value expansion)
528     (let ((new-var (gensym)))
529     (values nil nil (list new-var)
530     `(setq ,form ,new-var) form)))))
531 ram 1.25 ;;
532     ;; Local functions inhibit global setf methods...
533 ram 1.22 ((and environment
534 ram 1.25 (c::leaf-p (cdr (assoc (car form)
535     (c::lexenv-functions environment)))))
536 ram 1.22 (get-setf-method-inverse form `(funcall #'(setf ,(car form))) t))
537 ram 1.1 ((setq temp (info setf inverse (car form)))
538 wlott 1.10 (get-setf-method-inverse form `(,temp) nil))
539 ram 1.1 ((setq temp (info setf expander (car form)))
540     (funcall temp form environment))
541 ram 1.25 ;;
542     ;; If a macro, expand one level and try again. If not, go for the
543     ;; SETF function.
544 ram 1.1 (t
545     (multiple-value-bind (res win)
546     (macroexpand-1 form environment)
547     (if win
548 wlott 1.13 (get-setf-method res environment)
549 wlott 1.10 (get-setf-method-inverse form
550     `(funcall #'(setf ,(car form)))
551     t)))))))
552 ram 1.1
553 wlott 1.10 (defun get-setf-method-inverse (form inverse setf-function)
554 ram 1.1 (let ((new-var (gensym))
555     (vars nil)
556     (vals nil))
557     (dolist (x (cdr form))
558     (push (gensym) vars)
559     (push x vals))
560     (setq vals (nreverse vals))
561     (values vars vals (list new-var)
562 wlott 1.10 (if setf-function
563     `(,@inverse ,new-var ,@vars)
564     `(,@inverse ,@vars ,new-var))
565 ram 1.1 `(,(car form) ,@vars))))
566    
567    
568 wlott 1.29 (defun get-setf-method (form &optional environment)
569     "Like Get-Setf-Method-Multiple-Value, but signal an error if there are
570     more than one new-value variables."
571     (multiple-value-bind
572     (temps value-forms store-vars store-form access-form)
573     (get-setf-method-multiple-value form environment)
574     (when (cdr store-vars)
575     (error "GET-SETF-METHOD used for a form with multiple store ~
576     variables:~% ~S" form))
577     (values temps value-forms store-vars store-form access-form)))
578 ram 1.1
579 wlott 1.29
580 wlott 1.16 (defun defsetter (fn rest)
581 wlott 1.14 (let ((arglist (car rest))
582     (arglist-var (gensym "ARGS-"))
583     (new-var (car (cadr rest))))
584     (multiple-value-bind
585     (body local-decs doc)
586 wlott 1.16 (parse-defmacro arglist arglist-var (cddr rest) fn 'defsetf)
587 ram 1.1 (values
588 wlott 1.14 `(lambda (,arglist-var ,new-var)
589     ,@local-decs
590 wlott 1.16 ,body)
591 wlott 1.15 doc))))
592 ram 1.1
593    
594 wlott 1.16 (defmacro defsetf (access-fn &rest rest)
595 ram 1.1 "Associates a SETF update function or macro with the specified access
596     function or macro. The format is complex. See the manual for
597     details."
598     (cond ((not (listp (car rest)))
599     `(eval-when (load compile eval)
600 ram 1.22 (%define-setf-macro ',access-fn nil ',(car rest)
601     ,(when (and (car rest) (stringp (cadr rest)))
602     `',(cadr rest)))))
603 wlott 1.29 ((and (cdr rest) (listp (cadr rest)))
604     (destructuring-bind
605     (lambda-list (&rest store-variables) &body body)
606     rest
607     (let ((arglist-var (gensym "ARGS-"))
608     (access-form-var (gensym "ACCESS-FORM-"))
609     (env-var (gensym "ENVIRONMENT-")))
610     (multiple-value-bind
611     (body local-decs doc)
612     (parse-defmacro `(,lambda-list ,@store-variables)
613     arglist-var body access-fn 'defsetf
614     :annonymousp t)
615     `(eval-when (load compile eval)
616     (%define-setf-macro
617     ',access-fn
618     #'(lambda (,access-form-var ,env-var)
619     (declare (ignore ,env-var))
620     (%defsetf ,access-form-var ,(length store-variables)
621     #'(lambda (,arglist-var)
622     ,@local-decs
623     (block ,access-fn
624     ,body))))
625     nil
626     ',doc))))))
627     (t
628     (error "Ill-formed DEFSETF for ~S." access-fn))))
629 ram 1.1
630 wlott 1.29 (defun %defsetf (orig-access-form num-store-vars expander)
631 wlott 1.34 (collect ((subforms) (subform-vars) (subform-exprs) (store-vars))
632     (dolist (subform (cdr orig-access-form))
633     (if (constantp subform)
634     (subforms subform)
635     (let ((var (gensym)))
636     (subforms var)
637     (subform-vars var)
638     (subform-exprs subform))))
639     (dotimes (i num-store-vars)
640     (store-vars (gensym)))
641     (values (subform-vars)
642     (subform-exprs)
643     (store-vars)
644     (funcall expander (cons (subforms) (store-vars)))
645     `(,(car orig-access-form) ,@(subforms)))))
646 wlott 1.29
647    
648 ram 1.23 ;;; SETF -- Public
649     ;;;
650     ;;; Except for atoms, we always call GET-SETF-METHOD, since it has some
651     ;;; non-trivial semantics. But when there is a setf inverse, and G-S-M uses
652     ;;; it, then we return a call to the inverse, rather than returning a hairy let
653     ;;; form. This is probably important mainly as a convenince in allowing the
654     ;;; use of setf inverses without the full interpreter.
655     ;;;
656 ram 1.1 (defmacro setf (&rest args &environment env)
657     "Takes pairs of arguments like SETQ. The first is a place and the second
658     is the value that is supposed to go into that place. Returns the last
659     value. The place argument may be any of the access forms for which SETF
660     knows a corresponding setting form."
661 ram 1.22 (let ((nargs (length args)))
662     (cond
663     ((= nargs 2)
664 ram 1.23 (let ((place (first args))
665     (value-form (second args)))
666     (if (atom place)
667     `(setq ,place ,value-form)
668     (multiple-value-bind (dummies vals newval setter getter)
669 wlott 1.29 (get-setf-method-multiple-value place env)
670 ram 1.23 (declare (ignore getter))
671     (let ((inverse (info setf inverse (car place))))
672     (if (and inverse (eq inverse (car setter)))
673     `(,inverse ,@(cdr place) ,value-form)
674 wlott 1.29 `(let* (,@(mapcar #'list dummies vals))
675     (multiple-value-bind ,newval ,value-form
676     ,setter))))))))
677 ram 1.22 ((oddp nargs)
678     (error "Odd number of args to SETF."))
679     (t
680     (do ((a args (cddr a)) (l nil))
681     ((null a) `(progn ,@(nreverse l)))
682     (setq l (cons (list 'setf (car a) (cadr a)) l)))))))
683 ram 1.1
684     (defmacro psetf (&rest args &environment env)
685     "This is to SETF as PSETQ is to SETQ. Args are alternating place
686     expressions and values to go into those places. All of the subforms and
687     values are determined, left to right, and only then are the locations
688     updated. Returns NIL."
689 wlott 1.29 (collect ((let*-bindings) (mv-bindings) (setters))
690     (do ((a args (cddr a)))
691     ((endp a))
692     (if (endp (cdr a))
693     (error "Odd number of args to PSETF."))
694     (multiple-value-bind
695     (dummies vals newval setter getter)
696     (get-setf-method-multiple-value (car a) env)
697     (declare (ignore getter))
698     (let*-bindings (mapcar #'list dummies vals))
699     (mv-bindings (list newval (cadr a)))
700     (setters setter)))
701     (labels ((thunk (let*-bindings mv-bindings)
702     (if let*-bindings
703     `(let* ,(car let*-bindings)
704     (multiple-value-bind ,@(car mv-bindings)
705     ,(thunk (cdr let*-bindings) (cdr mv-bindings))))
706     `(progn ,@(setters) nil))))
707     (thunk (let*-bindings) (mv-bindings)))))
708 ram 1.1
709    
710     (defmacro shiftf (&rest args &environment env)
711     "One or more SETF-style place expressions, followed by a single
712 wlott 1.29 value expression. Evaluates all of the expressions in turn, then
713     assigns the value of each expression to the place on its left,
714     returning the value of the leftmost."
715 ram 1.1 (if (< (length args) 2)
716     (error "Too few argument forms to a SHIFTF."))
717 wlott 1.29 (collect ((let*-bindings) (forms))
718     (do ((first t nil)
719     (a args (cdr a))
720     (prev-store-vars)
721     (prev-setter))
722     ((endp (cdr a))
723     (forms `(multiple-value-bind ,prev-store-vars ,(car a)
724     ,prev-setter)))
725     (multiple-value-bind
726     (temps exprs store-vars setter getter)
727     (get-setf-method-multiple-value (car a) env)
728     (loop
729     for temp in temps
730     for expr in exprs
731     do (let*-bindings `(,temp ,expr)))
732     (forms (if first
733     getter
734     `(multiple-value-bind ,prev-store-vars ,getter
735     ,prev-setter)))
736     (setf prev-store-vars store-vars)
737     (setf prev-setter setter)))
738     `(let* ,(let*-bindings)
739     (multiple-value-prog1
740     ,@(forms)))))
741 ram 1.1
742     (defmacro rotatef (&rest args &environment env)
743     "Takes any number of SETF-style place expressions. Evaluates all of the
744 wlott 1.29 expressions in turn, then assigns to each place the value of the form to
745     its right. The rightmost form gets the value of the leftmost.
746     Returns NIL."
747     (when args
748     (collect ((let*-bindings) (mv-bindings) (setters) (getters))
749     (dolist (arg args)
750     (multiple-value-bind
751     (temps subforms store-vars setter getter)
752     (get-setf-method-multiple-value arg env)
753     (loop
754     for temp in temps
755     for subform in subforms
756     do (let*-bindings `(,temp ,subform)))
757     (mv-bindings store-vars)
758     (setters setter)
759     (getters getter)))
760     (setters nil)
761     (getters (car (getters)))
762     (labels ((thunk (mv-bindings getters)
763     (if mv-bindings
764     `((multiple-value-bind
765     ,(car mv-bindings)
766     ,(car getters)
767     ,@(thunk (cdr mv-bindings) (cdr getters))))
768     (setters))))
769     `(let* ,(let*-bindings)
770     ,@(thunk (mv-bindings) (cdr (getters))))))))
771 ram 1.1
772    
773     (defmacro define-modify-macro (name lambda-list function &optional doc-string)
774     "Creates a new read-modify-write macro like PUSH or INCF."
775     (let ((other-args nil)
776     (rest-arg nil)
777     (env (gensym))
778     (reference (gensym)))
779    
780     ;; Parse out the variable names and rest arg from the lambda list.
781     (do ((ll lambda-list (cdr ll))
782     (arg nil))
783     ((null ll))
784     (setq arg (car ll))
785     (cond ((eq arg '&optional))
786     ((eq arg '&rest)
787     (if (symbolp (cadr ll))
788     (setq rest-arg (cadr ll))
789     (error "Non-symbol &rest arg in definition of ~S." name))
790     (if (null (cddr ll))
791     (return nil)
792     (error "Illegal stuff after &rest arg in Define-Modify-Macro.")))
793     ((memq arg '(&key &allow-other-keys &aux))
794     (error "~S not allowed in Define-Modify-Macro lambda list." arg))
795     ((symbolp arg)
796     (push arg other-args))
797     ((and (listp arg) (symbolp (car arg)))
798     (push (car arg) other-args))
799     (t (error "Illegal stuff in lambda list of Define-Modify-Macro."))))
800     (setq other-args (nreverse other-args))
801     `(defmacro ,name (,reference ,@lambda-list &environment ,env)
802     ,doc-string
803     (multiple-value-bind (dummies vals newval setter getter)
804 wlott 1.13 (get-setf-method ,reference ,env)
805 ram 1.1 (do ((d dummies (cdr d))
806     (v vals (cdr v))
807     (let-list nil (cons (list (car d) (car v)) let-list)))
808     ((null d)
809     (push
810     (list (car newval)
811     ,(if rest-arg
812     `(list* ',function getter ,@other-args ,rest-arg)
813     `(list ',function getter ,@other-args)))
814     let-list)
815     `(let* ,(nreverse let-list)
816     ,setter)))))))
817    
818    
819    
820     (defmacro push (obj place &environment env)
821     "Takes an object and a location holding a list. Conses the object onto
822     the list, returning the modified list."
823     (if (symbolp place)
824     `(setq ,place (cons ,obj ,place))
825     (multiple-value-bind (dummies vals newval setter getter)
826 wlott 1.13 (get-setf-method place env)
827 ram 1.1 (do* ((d dummies (cdr d))
828     (v vals (cdr v))
829     (let-list nil))
830     ((null d)
831     (push (list (car newval) `(cons ,obj ,getter))
832     let-list)
833     `(let* ,(nreverse let-list)
834     ,setter))
835     (push (list (car d) (car v)) let-list)))))
836    
837    
838     (defmacro pushnew (obj place &rest keys &environment env)
839     "Takes an object and a location holding a list. If the object is already
840     in the list, does nothing. Else, conses the object onto the list. Returns
841     NIL. If there is a :TEST keyword, this is used for the comparison."
842     (if (symbolp place)
843     `(setq ,place (adjoin ,obj ,place ,@keys))
844     (multiple-value-bind (dummies vals newval setter getter)
845 wlott 1.13 (get-setf-method place env)
846 ram 1.1 (do* ((d dummies (cdr d))
847     (v vals (cdr v))
848     (let-list nil))
849     ((null d)
850     (push (list (car newval) `(adjoin ,obj ,getter ,@keys))
851     let-list)
852     `(let* ,(nreverse let-list)
853     ,setter))
854     (push (list (car d) (car v)) let-list)))))
855    
856    
857     (defmacro pop (place &environment env)
858     "The argument is a location holding a list. Pops one item off the front
859     of the list and returns it."
860     (if (symbolp place)
861     `(prog1 (car ,place) (setq ,place (cdr ,place)))
862     (multiple-value-bind (dummies vals newval setter getter)
863 wlott 1.13 (get-setf-method place env)
864 ram 1.1 (do* ((d dummies (cdr d))
865     (v vals (cdr v))
866     (let-list nil))
867     ((null d)
868     (push (list (car newval) getter) let-list)
869     `(let* ,(nreverse let-list)
870     (prog1 (car ,(car newval))
871     (setq ,(car newval) (cdr ,(car newval)))
872     ,setter)))
873     (push (list (car d) (car v)) let-list)))))
874    
875    
876     (define-modify-macro incf (&optional (delta 1)) +
877     "The first argument is some location holding a number. This number is
878     incremented by the second argument, DELTA, which defaults to 1.")
879    
880    
881     (define-modify-macro decf (&optional (delta 1)) -
882     "The first argument is some location holding a number. This number is
883     decremented by the second argument, DELTA, which defaults to 1.")
884    
885    
886     (defmacro remf (place indicator &environment env)
887     "Place may be any place expression acceptable to SETF, and is expected
888     to hold a property list or (). This list is destructively altered to
889     remove the property specified by the indicator. Returns T if such a
890     property was present, NIL if not."
891     (multiple-value-bind (dummies vals newval setter getter)
892 wlott 1.13 (get-setf-method place env)
893 ram 1.1 (do* ((d dummies (cdr d))
894     (v vals (cdr v))
895     (let-list nil)
896     (ind-temp (gensym))
897     (local1 (gensym))
898     (local2 (gensym)))
899     ((null d)
900     (push (list (car newval) getter) let-list)
901     (push (list ind-temp indicator) let-list)
902     `(let* ,(nreverse let-list)
903     (do ((,local1 ,(car newval) (cddr ,local1))
904     (,local2 nil ,local1))
905     ((atom ,local1) nil)
906     (cond ((atom (cdr ,local1))
907     (error "Odd-length property list in REMF."))
908     ((eq (car ,local1) ,ind-temp)
909     (cond (,local2
910     (rplacd (cdr ,local2) (cddr ,local1))
911     (return t))
912     (t (setq ,(car newval) (cddr ,(car newval)))
913     ,setter
914     (return t))))))))
915     (push (list (car d) (car v)) let-list))))
916    
917    
918     ;;; The built-in DEFSETFs.
919    
920     (defsetf car %rplaca)
921     (defsetf cdr %rplacd)
922     (defsetf caar (x) (v) `(%rplaca (car ,x) ,v))
923     (defsetf cadr (x) (v) `(%rplaca (cdr ,x) ,v))
924     (defsetf cdar (x) (v) `(%rplacd (car ,x) ,v))
925     (defsetf cddr (x) (v) `(%rplacd (cdr ,x) ,v))
926     (defsetf caaar (x) (v) `(%rplaca (caar ,x) ,v))
927     (defsetf cadar (x) (v) `(%rplaca (cdar ,x) ,v))
928     (defsetf cdaar (x) (v) `(%rplacd (caar ,x) ,v))
929     (defsetf cddar (x) (v) `(%rplacd (cdar ,x) ,v))
930     (defsetf caadr (x) (v) `(%rplaca (cadr ,x) ,v))
931     (defsetf caddr (x) (v) `(%rplaca (cddr ,x) ,v))
932     (defsetf cdadr (x) (v) `(%rplacd (cadr ,x) ,v))
933     (defsetf cdddr (x) (v) `(%rplacd (cddr ,x) ,v))
934     (defsetf caaaar (x) (v) `(%rplaca (caaar ,x) ,v))
935     (defsetf cadaar (x) (v) `(%rplaca (cdaar ,x) ,v))
936     (defsetf cdaaar (x) (v) `(%rplacd (caaar ,x) ,v))
937     (defsetf cddaar (x) (v) `(%rplacd (cdaar ,x) ,v))
938     (defsetf caadar (x) (v) `(%rplaca (cadar ,x) ,v))
939     (defsetf caddar (x) (v) `(%rplaca (cddar ,x) ,v))
940     (defsetf cdadar (x) (v) `(%rplacd (cadar ,x) ,v))
941     (defsetf cdddar (x) (v) `(%rplacd (cddar ,x) ,v))
942     (defsetf caaadr (x) (v) `(%rplaca (caadr ,x) ,v))
943     (defsetf cadadr (x) (v) `(%rplaca (cdadr ,x) ,v))
944     (defsetf cdaadr (x) (v) `(%rplacd (caadr ,x) ,v))
945     (defsetf cddadr (x) (v) `(%rplacd (cdadr ,x) ,v))
946     (defsetf caaddr (x) (v) `(%rplaca (caddr ,x) ,v))
947     (defsetf cadddr (x) (v) `(%rplaca (cdddr ,x) ,v))
948     (defsetf cdaddr (x) (v) `(%rplacd (caddr ,x) ,v))
949     (defsetf cddddr (x) (v) `(%rplacd (cdddr ,x) ,v))
950    
951     (defsetf first %rplaca)
952     (defsetf second (x) (v) `(%rplaca (cdr ,x) ,v))
953     (defsetf third (x) (v) `(%rplaca (cddr ,x) ,v))
954     (defsetf fourth (x) (v) `(%rplaca (cdddr ,x) ,v))
955     (defsetf fifth (x) (v) `(%rplaca (cddddr ,x) ,v))
956     (defsetf sixth (x) (v) `(%rplaca (cdr (cddddr ,x)) ,v))
957     (defsetf seventh (x) (v) `(%rplaca (cddr (cddddr ,x)) ,v))
958     (defsetf eighth (x) (v) `(%rplaca (cdddr (cddddr ,x)) ,v))
959     (defsetf ninth (x) (v) `(%rplaca (cddddr (cddddr ,x)) ,v))
960     (defsetf tenth (x) (v) `(%rplaca (cdr (cddddr (cddddr ,x))) ,v))
961     (defsetf rest %rplacd)
962    
963     (defsetf elt %setelt)
964     (defsetf aref %aset)
965 wlott 1.10 (defsetf row-major-aref %set-row-major-aref)
966 ram 1.1 (defsetf svref %svset)
967     (defsetf char %charset)
968     (defsetf bit %bitset)
969     (defsetf schar %scharset)
970     (defsetf sbit %sbitset)
971 wlott 1.10 (defsetf %array-dimension %set-array-dimension)
972     (defsetf %raw-bits %set-raw-bits)
973 ram 1.1 (defsetf symbol-value set)
974 wlott 1.28 (defsetf symbol-function fset)
975     (defsetf symbol-plist %set-symbol-plist)
976 ram 1.1 (defsetf documentation %set-documentation)
977     (defsetf nth %setnth)
978     (defsetf fill-pointer %set-fill-pointer)
979     (defsetf search-list %set-search-list)
980    
981 wlott 1.10 (defsetf sap-ref-8 %set-sap-ref-8)
982 wlott 1.27 (defsetf signed-sap-ref-8 %set-signed-sap-ref-8)
983 wlott 1.10 (defsetf sap-ref-16 %set-sap-ref-16)
984 wlott 1.27 (defsetf signed-sap-ref-16 %set-signed-sap-ref-16)
985 wlott 1.10 (defsetf sap-ref-32 %set-sap-ref-32)
986 wlott 1.27 (defsetf signed-sap-ref-32 %set-signed-sap-ref-32)
987 wlott 1.10 (defsetf sap-ref-sap %set-sap-ref-sap)
988     (defsetf sap-ref-single %set-sap-ref-single)
989     (defsetf sap-ref-double %set-sap-ref-double)
990 ram 1.1
991     (define-setf-method getf (place prop &optional default &environment env)
992     (multiple-value-bind (temps values stores set get)
993 wlott 1.13 (get-setf-method place env)
994 ram 1.1 (let ((newval (gensym))
995     (ptemp (gensym))
996 wlott 1.31 (def-temp (if default (gensym))))
997     (values `(,@temps ,ptemp ,@(if default `(,def-temp)))
998     `(,@values ,prop ,@(if default `(,default)))
999 ram 1.1 `(,newval)
1000 wlott 1.31 `(let ((,(car stores) (%putf ,get ,ptemp ,newval)))
1001     ,set
1002     ,newval)
1003     `(getf ,get ,ptemp ,@(if default `(,def-temp)))))))
1004 ram 1.1
1005     (define-setf-method get (symbol prop &optional default)
1006     (let ((symbol-temp (gensym))
1007     (prop-temp (gensym))
1008     (def-temp (gensym))
1009     (newval (gensym)))
1010     (values `(,symbol-temp ,prop-temp ,@(if default `(,def-temp)))
1011     `(,symbol ,prop ,@(if default `(,default)))
1012     (list newval)
1013     `(%put ,symbol-temp ,prop-temp ,newval)
1014     `(get ,symbol-temp ,prop-temp ,@(if default `(,def-temp))))))
1015    
1016     (define-setf-method gethash (key hashtable &optional default)
1017     (let ((key-temp (gensym))
1018     (hashtable-temp (gensym))
1019     (default-temp (gensym))
1020     (new-value-temp (gensym)))
1021     (values
1022     `(,key-temp ,hashtable-temp ,@(if default `(,default-temp)))
1023     `(,key ,hashtable ,@(if default `(,default)))
1024     `(,new-value-temp)
1025     `(%puthash ,key-temp ,hashtable-temp ,new-value-temp)
1026     `(gethash ,key-temp ,hashtable-temp ,@(if default `(,default-temp))))))
1027    
1028     (defsetf subseq (sequence start &optional (end nil)) (v)
1029     `(progn (replace ,sequence ,v :start1 ,start :end1 ,end)
1030     ,v))
1031    
1032    
1033 ram 1.22 ;;; Evil hack invented by the gnomes of Vassar Street. The function arg must
1034     ;;; be constant. Get a setf method for this function, pretending that the
1035     ;;; final (list) arg to apply is just a normal arg. If the setting and access
1036     ;;; forms produced in this way reference this arg at the end, then just splice
1037     ;;; the APPLY back onto the front and the right thing happens.
1038     ;;;
1039     ;;; We special-case uses functions in the Lisp package so that APPLY AREF works
1040     ;;; even though %ASET takes the new-value last. (there is (SETF AREF) as well
1041     ;;; as a setf method, etc.)
1042     ;;;
1043 ram 1.1 (define-setf-method apply (function &rest args &environment env)
1044 ram 1.22 (unless (and (listp function)
1045     (= (list-length function) 2)
1046     (eq (first function) 'function)
1047     (symbolp (second function)))
1048     (error "Setf of Apply is only defined for function args like #'symbol."))
1049     (let ((function (second function)))
1050     (multiple-value-bind
1051     (dummies vals newval setter getter)
1052     (if (eq (symbol-package function) (symbol-package 'aref))
1053     (get-setf-method-inverse (cons function args) `((setf ,function)) t)
1054     (get-setf-method (cons function args) env))
1055     (unless (and (eq (car (last args)) (car (last vals)))
1056     (eq (car (last getter)) (car (last dummies)))
1057     (eq (car (last setter)) (car (last dummies))))
1058     (error "Apply of ~S not understood as a location for Setf." function))
1059     (values dummies vals newval
1060     `(apply (function ,(car setter)) ,@(cdr setter))
1061     `(apply (function ,(car getter)) ,@(cdr getter))))))
1062 ram 1.1
1063    
1064 wlott 1.10 ;;; Special-case a BYTE bytespec so that the compiler can recognize it.
1065     ;;;
1066 ram 1.1 (define-setf-method ldb (bytespec place &environment env)
1067     "The first argument is a byte specifier. The second is any place form
1068     acceptable to SETF. Replaces the specified byte of the number in this
1069     place with bits from the low-order end of the new value."
1070     (multiple-value-bind (dummies vals newval setter getter)
1071 wlott 1.13 (get-setf-method place env)
1072 wlott 1.10 (if (and (consp bytespec) (eq (car bytespec) 'byte))
1073     (let ((n-size (gensym))
1074     (n-pos (gensym))
1075     (n-new (gensym)))
1076     (values (list* n-size n-pos dummies)
1077     (list* (second bytespec) (third bytespec) vals)
1078     (list n-new)
1079     `(let ((,(car newval) (dpb ,n-new (byte ,n-size ,n-pos)
1080     ,getter)))
1081     ,setter
1082     ,n-new)
1083     `(ldb (byte ,n-size ,n-pos) ,getter)))
1084     (let ((btemp (gensym))
1085     (gnuval (gensym)))
1086     (values (cons btemp dummies)
1087     (cons bytespec vals)
1088     (list gnuval)
1089     `(let ((,(car newval) (dpb ,gnuval ,btemp ,getter)))
1090     ,setter
1091     ,gnuval)
1092     `(ldb ,btemp ,getter))))))
1093 ram 1.1
1094    
1095     (define-setf-method mask-field (bytespec place &environment env)
1096     "The first argument is a byte specifier. The second is any place form
1097     acceptable to SETF. Replaces the specified byte of the number in this place
1098     with bits from the corresponding position in the new value."
1099     (multiple-value-bind (dummies vals newval setter getter)
1100 wlott 1.13 (get-setf-method place env)
1101 ram 1.1 (let ((btemp (gensym))
1102     (gnuval (gensym)))
1103     (values (cons btemp dummies)
1104     (cons bytespec vals)
1105     (list gnuval)
1106     `(let ((,(car newval) (deposit-field ,gnuval ,btemp ,getter)))
1107     ,setter
1108     ,gnuval)
1109     `(mask-field ,btemp ,getter)))))
1110    
1111    
1112     (define-setf-method the (type place &environment env)
1113     (multiple-value-bind (dummies vals newval setter getter)
1114 wlott 1.13 (get-setf-method place env)
1115 ram 1.1 (values dummies
1116     vals
1117     newval
1118     (subst `(the ,type ,(car newval)) (car newval) setter)
1119     `(the ,type ,getter))))
1120    
1121    
1122     ;;;; CASE, TYPECASE, & Friends.
1123    
1124     (eval-when (compile load eval)
1125    
1126     ;;; CASE-BODY returns code for all the standard "case" macros. Name is the
1127     ;;; macro name, and keyform is the thing to case on. Multi-p indicates whether
1128     ;;; a branch may fire off a list of keys; otherwise, a key that is a list is
1129     ;;; interpreted in some way as a single key. When multi-p, test is applied to
1130     ;;; the value of keyform and each key for a given branch; otherwise, test is
1131     ;;; applied to the value of keyform and the entire first element, instead of
1132     ;;; each part, of the case branch. When errorp, no t or otherwise branch is
1133     ;;; permitted, and an ERROR form is generated. When proceedp, it is an error
1134     ;;; to omit errorp, and the ERROR form generated is executed within a
1135     ;;; RESTART-CASE allowing keyform to be set and retested.
1136     ;;;
1137     (defun case-body (name keyform cases multi-p test errorp proceedp)
1138     (let ((keyform-value (gensym))
1139     (clauses ())
1140     (keys ()))
1141     (dolist (case cases)
1142     (cond ((atom case)
1143     (error "~S -- Bad clause in ~S." case name))
1144     ((memq (car case) '(t otherwise))
1145     (if errorp
1146     (error "No default clause allowed in ~S: ~S" name case)
1147     (push `(t nil ,@(rest case)) clauses)))
1148     ((and multi-p (listp (first case)))
1149     (setf keys (append (first case) keys))
1150     (push `((or ,@(mapcar #'(lambda (key)
1151     `(,test ,keyform-value ',key))
1152     (first case)))
1153     nil ,@(rest case))
1154     clauses))
1155     (t
1156     (push (first case) keys)
1157     (push `((,test ,keyform-value
1158     ',(first case)) nil ,@(rest case)) clauses))))
1159     (case-body-aux name keyform keyform-value clauses keys errorp proceedp
1160     `(,(if multi-p 'member 'or) ,@keys))))
1161    
1162     ;;; CASE-BODY-AUX provides the expansion once CASE-BODY has groveled all the
1163     ;;; cases. Note: it is not necessary that the resulting code signal
1164     ;;; case-failure conditions, but that's what KMP's prototype code did. We call
1165     ;;; CASE-BODY-ERROR, because of how closures are compiled. RESTART-CASE has
1166     ;;; forms with closures that the compiler causes to be generated at the top of
1167     ;;; any function using the case macros, regardless of whether they are needed.
1168     ;;;
1169     (defun case-body-aux (name keyform keyform-value clauses keys
1170     errorp proceedp expected-type)
1171     (if proceedp
1172     (let ((block (gensym))
1173     (again (gensym)))
1174     `(let ((,keyform-value ,keyform))
1175     (block ,block
1176     (tagbody
1177     ,again
1178     (return-from
1179     ,block
1180     (cond ,@(nreverse clauses)
1181     (t
1182     (setf ,keyform-value
1183     (setf ,keyform
1184     (case-body-error
1185     ',name ',keyform ,keyform-value
1186     ',expected-type ',keys)))
1187     (go ,again))))))))
1188     `(let ((,keyform-value ,keyform))
1189     (cond
1190     ,@(nreverse clauses)
1191     ,@(if errorp
1192     `((t (error 'conditions::case-failure
1193     :name ',name
1194     :datum ,keyform-value
1195     :expected-type ',expected-type
1196     :possibilities ',keys))))))))
1197    
1198     ); eval-when
1199    
1200     (defun case-body-error (name keyform keyform-value expected-type keys)
1201     (restart-case
1202     (error 'conditions::case-failure
1203     :name name
1204     :datum keyform-value
1205     :expected-type expected-type
1206     :possibilities keys)
1207     (store-value (value)
1208     :report (lambda (stream)
1209     (format stream "Supply a new value for ~S." keyform))
1210     :interactive read-evaluated-form
1211     value)))
1212    
1213    
1214     (defmacro case (keyform &body cases)
1215     "CASE Keyform {({(Key*) | Key} Form*)}*
1216     Evaluates the Forms in the first clause with a Key EQL to the value of
1217     Keyform. If a singleton key is T then the clause is a default clause."
1218     (case-body 'case keyform cases t 'eql nil nil))
1219    
1220     (defmacro ccase (keyform &body cases)
1221     "CCASE Keyform {({(Key*) | Key} Form*)}*
1222     Evaluates the Forms in the first clause with a Key EQL to the value of
1223     Keyform. If none of the keys matches then a correctable error is
1224     signalled."
1225     (case-body 'ccase keyform cases t 'eql t t))
1226    
1227     (defmacro ecase (keyform &body cases)
1228     "ECASE Keyform {({(Key*) | Key} Form*)}*
1229     Evaluates the Forms in the first clause with a Key EQL to the value of
1230     Keyform. If none of the keys matches then an error is signalled."
1231     (case-body 'ecase keyform cases t 'eql t nil))
1232    
1233     (defmacro typecase (keyform &body cases)
1234     "TYPECASE Keyform {(Type Form*)}*
1235     Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1236     is true."
1237     (case-body 'typecase keyform cases nil 'typep nil nil))
1238    
1239     (defmacro ctypecase (keyform &body cases)
1240     "CTYPECASE Keyform {(Type Form*)}*
1241     Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1242     is true. If no form is satisfied then a correctable error is signalled."
1243     (case-body 'ctypecase keyform cases nil 'typep t t))
1244    
1245     (defmacro etypecase (keyform &body cases)
1246     "ETYPECASE Keyform {(Type Form*)}*
1247     Evaluates the Forms in the first clause for which TYPEP of Keyform and Type
1248     is true. If no form is satisfied then an error is signalled."
1249     (case-body 'etypecase keyform cases nil 'typep t nil))
1250    
1251    
1252     ;;;; ASSERT and CHECK-TYPE.
1253    
1254     ;;; ASSERT is written this way, to call ASSERT-ERROR, because of how closures
1255     ;;; are compiled. RESTART-CASE has forms with closures that the compiler
1256     ;;; causes to be generated at the top of any function using ASSERT, regardless
1257     ;;; of whether they are needed.
1258     ;;;
1259     (defmacro assert (test-form &optional places datum &rest arguments)
1260     "Signals an error if the value of test-form is nil. Continuing from this
1261     error using the CONTINUE restart will allow the user to alter the value of
1262     some locations known to SETF, starting over with test-form. Returns nil."
1263     `(loop
1264     (when ,test-form (return nil))
1265     (assert-error ',test-form ',places ,datum ,@arguments)
1266     ,@(mapcar #'(lambda (place)
1267     `(setf ,place (assert-prompt ',place ,place)))
1268     places)))
1269    
1270     (defun assert-error (test-form places datum &rest arguments)
1271     (restart-case (if datum
1272     (apply #'error datum arguments)
1273     (simple-assertion-failure test-form))
1274     (continue ()
1275     :report (lambda (stream) (assert-report places stream))
1276     nil)))
1277    
1278     (defun simple-assertion-failure (assertion)
1279     (error 'simple-type-error
1280     :datum assertion
1281     :expected-type nil ;this needs some work in next revision. -kmp
1282     :format-string "The assertion ~S failed."
1283     :format-arguments (list assertion)))
1284    
1285     (defun assert-report (names stream)
1286     (format stream "Retry assertion")
1287     (if names
1288     (format stream " with new value~P for ~{~S~^, ~}."
1289     (length names) names)
1290     (format stream ".")))
1291    
1292     (defun assert-prompt (name value)
1293     (cond ((y-or-n-p "The old value of ~S is ~S.~
1294     ~%Do you want to supply a new value? "
1295     name value)
1296     (format *query-io* "~&Type a form to be evaluated:~%")
1297     (flet ((read-it () (eval (read *query-io*))))
1298     (if (symbolp name) ;help user debug lexical variables
1299     (progv (list name) (list value) (read-it))
1300     (read-it))))
1301     (t value)))
1302    
1303    
1304     ;;; CHECK-TYPE is written this way, to call CHECK-TYPE-ERROR, because of how
1305     ;;; closures are compiled. RESTART-CASE has forms with closures that the
1306     ;;; compiler causes to be generated at the top of any function using
1307     ;;; CHECK-TYPE, regardless of whether they are needed. Because it would be
1308     ;;; nice if this were cheap to use, and some things can't afford this excessive
1309     ;;; consing (e.g., READ-CHAR), we bend backwards a little.
1310     ;;;
1311    
1312     (defmacro check-type (place type &optional type-string)
1313     "Signals an error of type type-error if the contents of place are not of the
1314     specified type. If an error is signaled, this can only return if
1315     STORE-VALUE is invoked. It will store into place and start over."
1316     (let ((place-value (gensym)))
1317     `(loop
1318     (let ((,place-value ,place))
1319     (when (typep ,place-value ',type) (return nil))
1320     (setf ,place
1321     (check-type-error ',place ,place-value ',type ,type-string))))))
1322    
1323     (defun check-type-error (place place-value type type-string)
1324     (restart-case (if type-string
1325     (error 'simple-type-error
1326     :datum place :expected-type type
1327     :format-string
1328     "The value of ~S is ~S, which is not ~A."
1329     :format-arguments
1330     (list place place-value type-string))
1331     (error 'simple-type-error
1332     :datum place :expected-type type
1333     :format-string
1334     "The value of ~S is ~S, which is not of type ~S."
1335     :format-arguments
1336     (list place place-value type)))
1337     (store-value (value)
1338     :report (lambda (stream)
1339     (format stream "Supply a new value of ~S."
1340     place))
1341     :interactive read-evaluated-form
1342     value)))
1343    
1344     ;;; READ-EVALUATED-FORM is used as the interactive method for restart cases
1345     ;;; setup by the Common Lisp "casing" (e.g., CCASE and CTYPECASE) macros
1346     ;;; and by CHECK-TYPE.
1347     ;;;
1348     (defun read-evaluated-form ()
1349     (format *query-io* "~&Type a form to be evaluated:~%")
1350     (list (eval (read *query-io*))))
1351    
1352    
1353     ;;;; With-XXX
1354    
1355     (defmacro with-open-file ((var &rest open-args) &body (forms decls))
1356 ram 1.5 "Bindspec is of the form (Stream File-Name . Options). The file whose
1357     name is File-Name is opened using the Options and bound to the variable
1358     Stream. If the call to open is unsuccessful, the forms are not
1359     evaluated. The Forms are executed, and when they terminate, normally or
1360     otherwise, the file is closed."
1361 ram 1.1 (let ((abortp (gensym)))
1362     `(let ((,var (open ,@open-args))
1363     (,abortp t))
1364     ,@decls
1365 ram 1.5 (when ,var
1366     (unwind-protect
1367     (multiple-value-prog1
1368     (progn ,@forms)
1369     (setq ,abortp nil))
1370 ram 1.1 (close ,var :abort ,abortp))))))
1371    
1372    
1373 ram 1.5
1374 ram 1.1 (defmacro with-open-stream ((var stream) &body (forms decls))
1375     "The form stream should evaluate to a stream. VAR is bound
1376     to the stream and the forms are evaluated as an implicit
1377     progn. The stream is closed upon exit."
1378     (let ((abortp (gensym)))
1379     `(let ((,var ,stream)
1380     (,abortp t))
1381     ,@decls
1382     (unwind-protect
1383     (multiple-value-prog1
1384     (progn ,@forms)
1385     (setq ,abortp nil))
1386     (when ,var
1387     (close ,var :abort ,abortp))))))
1388    
1389    
1390     (defmacro with-input-from-string ((var string &key index start end) &body (forms decls))
1391     "Binds the Var to an input stream that returns characters from String and
1392     executes the body. See manual for details."
1393     `(let ((,var
1394     ,(if end
1395     `(make-string-input-stream ,string ,(or start 0) ,end)
1396     `(make-string-input-stream ,string ,(or start 0)))))
1397     ,@decls
1398     (unwind-protect
1399     (progn ,@forms)
1400     (close ,var)
1401     ,@(if index `((setf ,index (string-input-stream-current ,var)))))))
1402    
1403    
1404     (defmacro with-output-to-string ((var &optional string) &body (forms decls))
1405 ram 1.5 "If *string* is specified, it must be a string with a fill pointer;
1406     the output is incrementally appended to the string (as if by use of
1407     VECTOR-PUSH-EXTEND)."
1408 ram 1.1 (if string
1409     `(let ((,var (make-fill-pointer-output-stream ,string)))
1410     ,@decls
1411     (unwind-protect
1412     (progn ,@forms)
1413     (close ,var)))
1414     `(let ((,var (make-string-output-stream)))
1415     ,@decls
1416     (unwind-protect
1417     (progn ,@forms)
1418     (close ,var))
1419     (get-output-stream-string ,var))))
1420    
1421    
1422     ;;;; Iteration macros:
1423    
1424     (defmacro dotimes ((var count &optional (result nil)) &body body)
1425     (cond ((numberp count)
1426     `(do ((,var 0 (1+ ,var)))
1427     ((>= ,var ,count) ,result)
1428 ram 1.8 (declare (type unsigned-byte ,var))
1429 ram 1.1 ,@body))
1430     (t (let ((v1 (gensym)))
1431     `(do ((,var 0 (1+ ,var)) (,v1 ,count))
1432     ((>= ,var ,v1) ,result)
1433 ram 1.8 (declare (type unsigned-byte ,var))
1434 ram 1.1 ,@body)))))
1435    
1436    
1437     ;;; We repeatedly bind the var instead of setting it so that we never give the
1438     ;;; var a random value such as NIL (which might conflict with a declaration).
1439 ram 1.35 ;;; If there is a result form, we introduce a gratitous binding of the variable
1440     ;;; to NIL w/o the declarations, then evaluate the result form in that
1441     ;;; environment. We spuriously reference the gratuitous variable, since we
1442     ;;; don't want to use IGNORABLE on what might be a special var.
1443 ram 1.1 ;;;
1444     (defmacro dolist ((var list &optional (result nil)) &body body)
1445     (let ((n-list (gensym)))
1446     `(do ((,n-list ,list (cdr ,n-list)))
1447     ((endp ,n-list)
1448 ram 1.35 ,@(if result
1449     `((let ((,var nil))
1450     ,var
1451     ,result))
1452     '(nil)))
1453 ram 1.1 (let ((,var (car ,n-list)))
1454     ,@body))))
1455    
1456    
1457     (defmacro do (varlist endlist &body (body decls))
1458     "DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
1459     Iteration construct. Each Var is initialized in parallel to the value of the
1460     specified Init form. On subsequent iterations, the Vars are assigned the
1461     value of the Step form (if any) in paralell. The Test is evaluated before
1462     each evaluation of the body Forms. When the Test is true, the the Exit-Forms
1463     are evaluated as a PROGN, with the result being the value of the DO. A block
1464     named NIL is established around the entire expansion, allowing RETURN to be
1465     used as an laternate exit mechanism."
1466    
1467     (do-do-body varlist endlist body decls 'let 'psetq 'do nil))
1468    
1469    
1470     (defmacro do* (varlist endlist &body (body decls))
1471     "DO* ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
1472     Iteration construct. Each Var is initialized sequentially (like LET*) to the
1473     value of the specified Init form. On subsequent iterations, the Vars are
1474     sequentially assigned the value of the Step form (if any). The Test is
1475     evaluated before each evaluation of the body Forms. When the Test is true,
1476     the the Exit-Forms are evaluated as a PROGN, with the result being the value
1477     of the DO. A block named NIL is established around the entire expansion,
1478     allowing RETURN to be used as an laternate exit mechanism."
1479     (do-do-body varlist endlist body decls 'let* 'setq 'do* nil))
1480    
1481    
1482     ;;;; Miscellaneous macros:
1483    
1484     (defmacro locally (&rest forms)
1485     "A form providing a container for locally-scoped variables."
1486     `(let () ,@forms))
1487    
1488     (defmacro psetq (&rest pairs)
1489     (do ((lets nil)
1490     (setqs nil)
1491     (pairs pairs (cddr pairs)))
1492     ((atom (cdr pairs))
1493     `(let ,(nreverse lets) (setq ,@(nreverse setqs))))
1494     (let ((gen (gensym)))
1495     (push `(,gen ,(cadr pairs)) lets)
1496     (push (car pairs) setqs)
1497     (push gen setqs))))
1498    
1499    
1500     ;;;; With-Compilation-Unit:
1501    
1502     ;;; True if we are within a With-Compilation-Unit form, which normally causes
1503     ;;; nested uses to be NOOPS.
1504     ;;;
1505     (defvar *in-compilation-unit* nil)
1506    
1507     ;;; Count of the number of compilation units dynamically enclosed by the
1508     ;;; current active WITH-COMPILATION-UNIT that were unwound out of.
1509     ;;;
1510     (defvar *aborted-compilation-units*)
1511    
1512 ram 1.21 (declaim (special c::*context-declarations*))
1513    
1514    
1515     ;;; EVALUATE-DECLARATION-CONTEXT -- Internal
1516     ;;;
1517     ;;; Recursively descend the context form, returning true if this subpart
1518     ;;; matches the specified context.
1519     ;;;
1520     (defun evaluate-declaration-context (context name parent)
1521 ram 1.24 (let* ((base (if (and (consp name) (consp (cdr name)))
1522     (cadr name)
1523     name))
1524     (package (and (symbolp base) (symbol-package base))))
1525 ram 1.21 (if (atom context)
1526 ram 1.24 (multiple-value-bind (ignore how)
1527     (if package
1528     (find-symbol (symbol-name base) package)
1529     (values nil nil))
1530     (declare (ignore ignore))
1531     (case context
1532     (:internal (eq how :internal))
1533     (:external (eq how :external))
1534     (:uninterned (and (symbolp base) (not package)))
1535     (:anonymous (not name))
1536     (:macro (eq parent 'defmacro))
1537     (:function (member parent '(defun labels flet function)))
1538     (:global (member parent '(defun defmacro function)))
1539     (:local (member parent '(labels flet)))
1540     (t
1541     (error "Unknown declaration context: ~S." context))))
1542 ram 1.21 (case (first context)
1543     (:or
1544     (loop for x in (rest context)
1545     thereis (evaluate-declaration-context x name parent)))
1546     (:and
1547     (loop for x in (rest context)
1548     always (evaluate-declaration-context x name parent)))
1549     (:not
1550     (evaluate-declaration-context (second context) name parent))
1551     (:member
1552     (member name (rest context) :test #'equal))
1553     (:match
1554     (let ((name (concatenate 'string "$" (string base) "$")))
1555     (loop for x in (rest context)
1556     thereis (search (string x) name))))
1557 ram 1.24 (:package
1558     (and package
1559     (loop for x in (rest context)
1560     thereis (eq (find-package (string x)) package))))
1561 ram 1.21 (t
1562     (error "Unknown declaration context: ~S." context))))))
1563    
1564    
1565     ;;; PROCESS-CONTEXT-DECLARATIONS -- Internal
1566     ;;;
1567     ;;; Given a list of context declaration specs, return a new value for
1568     ;;; C::*CONTEXT-DECLARATIONS*.
1569     ;;;
1570     (defun process-context-declarations (decls)
1571     (append
1572     (mapcar
1573     #'(lambda (decl)
1574     (unless (>= (length decl) 2)
1575     (error "Context declaration spec should have context and at ~
1576     least one DECLARE form:~% ~S" decl))
1577     #'(lambda (name parent)
1578     (when (evaluate-declaration-context (first decl) name parent)
1579     (rest decl))))
1580     decls)
1581     c::*context-declarations*))
1582    
1583    
1584 ram 1.1 ;;; With-Compilation-Unit -- Public
1585     ;;;
1586     (defmacro with-compilation-unit (options &body body)
1587 ram 1.21 "WITH-COMPILATION-UNIT ({Key Value}*) Form*
1588     This form affects compilations that take place within its dynamic extent. It
1589     is intended to be wrapped around the compilation of all files in the same
1590     system. These keywords are defined:
1591     :OVERRIDE Boolean-Form
1592     One of the effects of this form is to delay undefined warnings
1593     until the end of the form, instead of giving them at the end of each
1594     compilation. If OVERRIDE is NIL (the default), then the outermost
1595     WITH-COMPILATION-UNIT form grabs the undefined warnings. Specifying
1596     OVERRIDE true causes that form to grab any enclosed warnings, even if
1597     it is enclosed by another WITH-COMPILATION-UNIT.
1598     :OPTIMIZE Decl-Form
1599     Decl-Form should evaluate to an OPTIMIZE declaration specifier. This
1600     declaration changes the `global' policy for compilations within the
1601     body.
1602     :OPTIMIZE-INTERFACE Decl-Form
1603     Like OPTIMIZE, except that it specifies the value of the CMU extension
1604     OPTIMIZE-INTERFACE policy (which controls argument type and syntax
1605     checking.)
1606     :CONTEXT-DECLARATIONS List-of-Context-Decls-Form
1607     This is a CMU extension which allows compilation to be controlled
1608     by pattern matching on the context in which a definition appears. The
1609     argument should evaluate to a list of lists of the form:
1610     (Context-Spec Declare-Form+)
1611     In the indicated context, the specified declare forms are inserted at
1612     the head of each definition. The declare forms for all contexts that
1613     match are appended together, with earlier declarations getting
1614     predecence over later ones. A simple example:
1615     :context-declarations
1616     '((:external (declare (optimize (safety 2)))))
1617     This will cause all functions that are named by external symbols to be
1618     compiled with SAFETY 2. The full syntax of context specs is:
1619     :INTERNAL, :EXTERNAL
1620     True if the symbols is internal (external) in its home package.
1621     :UNINTERNED
1622     True if the symbol has no home package.
1623     :ANONYMOUS
1624     True if the function doesn't have any interesting name (not
1625     DEFMACRO, DEFUN, LABELS or FLET).
1626     :MACRO, :FUNCTION
1627     :MACRO is a global (DEFMACRO) macro. :FUNCTION is anything else.
1628     :LOCAL, :GLOBAL
1629     :LOCAL is a LABELS or FLET. :GLOBAL is anything else.
1630     (:OR Context-Spec*)
1631     True in any specified context.
1632     (:AND Context-Spec*)
1633     True only when all specs are true.
1634     (:NOT Context-Spec)
1635     True when the spec is false.
1636     (:MEMBER Name*)
1637     True when the name is one of these names (EQUAL test.)
1638     (:MATCH Pattern*)
1639     True when any of the patterns is a substring of the name. The name
1640     is wrapped with $'s, so $FOO matches names beginning with FOO,
1641     etc."
1642     (let ((override nil)
1643     (optimize nil)
1644     (optimize-interface nil)
1645     (context-declarations nil)
1646 ram 1.1 (n-fun (gensym))
1647     (n-abort-p (gensym)))
1648     (when (oddp (length options))
1649     (error "Odd number of key/value pairs: ~S." options))
1650     (do ((opt options (cddr opt)))
1651     ((null opt))
1652     (case (first opt)
1653 ram 1.21 (:override
1654     (setq override (second opt)))
1655     (:optimize
1656     (setq optimize (second opt)))
1657     (:optimize-interface
1658     (setq optimize-interface (second opt)))
1659     (:context-declarations
1660     (setq context-declarations (second opt)))
1661 ram 1.1 (t
1662     (warn "Ignoring unknown option: ~S." (first opt)))))
1663    
1664 ram 1.21 `(flet ((,n-fun ()
1665     (let (,@(when optimize
1666     `((c::*default-cookie*
1667     (c::process-optimize-declaration
1668     ,optimize c::*default-cookie*))))
1669     ,@(when optimize-interface
1670     `((c::*default-interface-cookie*
1671     (c::process-optimize-declaration
1672     ,optimize-interface
1673     c::*default-interface-cookie*))))
1674     ,@(when context-declarations
1675     `((c::*context-declarations*
1676     (process-context-declarations
1677     ,context-declarations)))))
1678     ,@body)))
1679     (if (or ,override (not *in-compilation-unit*))
1680 ram 1.6 (let ((c::*undefined-warnings* nil)
1681 ram 1.1 (c::*compiler-error-count* 0)
1682     (c::*compiler-warning-count* 0)
1683     (c::*compiler-note-count* 0)
1684     (*in-compilation-unit* t)
1685     (*aborted-compilation-units* 0)
1686     (,n-abort-p t))
1687 ram 1.6 (handler-bind ((c::parse-unknown-type
1688     #'(lambda (c)
1689     (c::note-undefined-reference
1690     (c::parse-unknown-type-specifier c)
1691     :type))))
1692     (unwind-protect
1693     (multiple-value-prog1
1694     (,n-fun)
1695     (setq ,n-abort-p nil))
1696     (c::print-summary ,n-abort-p *aborted-compilation-units*))))
1697 ram 1.1 (let ((,n-abort-p t))
1698     (unwind-protect
1699     (multiple-value-prog1
1700     (,n-fun)
1701     (setq ,n-abort-p nil))
1702     (when ,n-abort-p
1703     (incf *aborted-compilation-units*))))))))

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