1 ;;;; bootstrapping fundamental machinery (e.g. DEFUN, DEFCONSTANT,
2 ;;;; DEFVAR) from special forms and primitive functions
4 ;;;; KLUDGE: The bootstrapping aspect of this is now obsolete. It was
5 ;;;; originally intended that this file file would be loaded into a
6 ;;;; Lisp image which had Common Lisp primitives defined, and DEFMACRO
7 ;;;; defined, and little else. Since then that approach has been
8 ;;;; dropped and this file has been modified somewhat to make it work
9 ;;;; more cleanly when used to predefine macros at
10 ;;;; build-the-cross-compiler time.
12 ;;;; This software is part of the SBCL system. See the README file for
13 ;;;; more information.
15 ;;;; This software is derived from the CMU CL system, which was
16 ;;;; written at Carnegie Mellon University and released into the
17 ;;;; public domain. The software is in the public domain and is
18 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
19 ;;;; files for more information.
21 (in-package "SB!IMPL")
26 (defmacro-mundanely in-package
(string-designator)
27 (let ((string (string string-designator
)))
28 `(eval-when (:compile-toplevel
:load-toplevel
:execute
)
29 (setq *package
* (find-undeleted-package-or-lose ,string
)))))
31 ;;;; MULTIPLE-VALUE-FOO
33 (defun list-of-symbols-p (x)
37 (defmacro-mundanely multiple-value-bind
(vars value-form
&body body
)
38 (if (list-of-symbols-p vars
)
39 ;; It's unclear why it would be important to special-case the LENGTH=1 case
40 ;; at this level, but the CMU CL code did it, so.. -- WHN 19990411
41 (if (= (length vars
) 1)
42 `(let ((,(car vars
) ,value-form
))
44 (let ((ignore (sb!xc
:gensym
)))
45 `(multiple-value-call #'(lambda (&optional
,@(mapcar #'list vars
)
47 (declare (ignore ,ignore
))
50 (error "Vars is not a list of symbols: ~S" vars
)))
52 (defmacro-mundanely multiple-value-setq
(vars value-form
)
53 (unless (list-of-symbols-p vars
)
54 (error "Vars is not a list of symbols: ~S" vars
))
55 ;; MULTIPLE-VALUE-SETQ is required to always return just the primary
56 ;; value of the value-from, even if there are no vars. (SETF VALUES)
57 ;; in turn is required to return as many values as there are
58 ;; value-places, hence this:
60 `(values (setf (values ,@vars
) ,value-form
))
61 `(values ,value-form
)))
63 (defmacro-mundanely multiple-value-list
(value-form)
64 `(multiple-value-call #'list
,value-form
))
66 ;;;; various conditional constructs
68 ;;; COND defined in terms of IF
69 (defmacro-mundanely cond
(&rest clauses
)
72 (let ((clause (first clauses
))
73 (more (rest clauses
)))
75 (error 'simple-type-error
76 :format-control
"COND clause is not a ~S: ~S"
77 :format-arguments
(list 'cons clause
)
80 (let ((test (first clause
))
81 (forms (rest clause
)))
83 (let ((n-result (gensym)))
84 `(let ((,n-result
,test
))
89 ;; THE to preserve non-toplevelness for FOO in
91 ;; FIXME: this hides all other possible stylistic issues,
92 ;; not the least of which is a code deletion note,
93 ;; if there are forms following the one whose head is T.
94 ;; This is not usually the SBCL preferred way.
95 `(the t
(progn ,@forms
))
98 ,(when more
`(cond ,@more
))))))))))
100 (defmacro-mundanely when
(test &body forms
)
102 "If the first argument is true, the rest of the forms are
103 evaluated as a PROGN."
104 `(if ,test
(progn ,@forms
) nil
))
106 (defmacro-mundanely unless
(test &body forms
)
108 "If the first argument is not true, the rest of the forms are
109 evaluated as a PROGN."
110 `(if ,test nil
(progn ,@forms
)))
112 (defmacro-mundanely and
(&rest forms
)
113 (cond ((endp forms
) t
)
115 ;; Preserve non-toplevelness of the form!
116 `(the t
,(first forms
)))
122 (defmacro-mundanely or
(&rest forms
)
123 (cond ((endp forms
) nil
)
125 ;; Preserve non-toplevelness of the form!
126 `(the t
,(first forms
)))
128 (let ((n-result (gensym)))
129 `(let ((,n-result
,(first forms
)))
132 (or ,@(rest forms
))))))))
134 ;;;; various sequencing constructs
136 (flet ((prog-expansion-from-let (varlist body-decls let
)
137 (multiple-value-bind (body decls
)
138 (parse-body body-decls
:doc-string-allowed nil
)
142 (tagbody ,@body
))))))
143 (defmacro-mundanely prog
(varlist &body body-decls
)
144 (prog-expansion-from-let varlist body-decls
'let
))
145 (defmacro-mundanely prog
* (varlist &body body-decls
)
146 (prog-expansion-from-let varlist body-decls
'let
*)))
148 (defmacro-mundanely prog1
(result &body body
)
149 (let ((n-result (gensym)))
150 `(let ((,n-result
,result
))
154 (defmacro-mundanely prog2
(form1 result
&body body
)
155 `(prog1 (progn ,form1
,result
) ,@body
))
159 ;;; Should we save the inline expansion of the function named NAME?
160 (defun inline-fun-name-p (name)
162 ;; the normal reason for saving the inline expansion
163 (let ((inlinep (info :function
:inlinep name
)))
164 (member inlinep
'(:inline
:maybe-inline
)))
165 ;; another reason for saving the inline expansion: If the
166 ;; ANSI-recommended idiom
167 ;; (DECLAIM (INLINE FOO))
169 ;; (DECLAIM (NOTINLINE FOO))
170 ;; has been used, and then we later do another
172 ;; without a preceding
173 ;; (DECLAIM (INLINE FOO))
174 ;; what should we do with the old inline expansion when we see the
175 ;; new DEFUN? Overwriting it with the new definition seems like
176 ;; the only unsurprising choice.
177 (info :function
:inline-expansion-designator name
)))
179 (defmacro-mundanely defun
(&environment env name args
&body body
)
181 "Define a function at top level."
183 (unless (symbol-package (fun-name-block-name name
))
184 (warn "DEFUN of uninterned function name ~S (tricky for GENESIS)" name
))
185 (multiple-value-bind (forms decls doc
) (parse-body body
)
186 (let* (;; stuff shared between LAMBDA and INLINE-LAMBDA and NAMED-LAMBDA
188 ,@(when doc
(list doc
))
190 (block ,(fun-name-block-name name
)
192 (lambda `(lambda ,@lambda-guts
))
193 (named-lambda `(named-lambda ,name
,@lambda-guts
))
195 (when (inline-fun-name-p name
)
196 ;; we want to attempt to inline, so complain if we can't
197 (or (sb!c
:maybe-inline-syntactic-closure lambda env
)
200 #-sb-xc-host sb
!c
:maybe-compiler-notify
201 "lexical environment too hairy, can't inline DEFUN ~S"
205 (eval-when (:compile-toplevel
)
206 (sb!c
:%compiler-defun
',name
',inline-lambda t
))
207 (%defun
',name
,named-lambda
(sb!c
:source-location
)
208 ,@(and inline-lambda
`(',inline-lambda
)))
209 ;; This warning, if produced, comes after the DEFUN happens.
210 ;; When compiling, there's no real difference, but when interpreting,
211 ;; if there is a handler for style-warning that nonlocally exits,
212 ;; it's wrong to have skipped the DEFUN itself, since if there is no
213 ;; function, then the warning ought not to have been issued at all.
214 ,@(when (typep name
'(cons (eql setf
)))
215 `((eval-when (:compile-toplevel
:execute
)
216 (sb!c
::warn-if-setf-macro
',name
))))))))
220 (defun %defun
(name def source-location
&optional inline-lambda
)
221 (declare (type function def
))
222 ;; should've been checked by DEFMACRO DEFUN
223 (aver (legal-fun-name-p name
))
224 (sb!c
:%compiler-defun
name inline-lambda nil
)
226 (warn 'redefinition-with-defun
227 :name name
:new-function def
:new-location source-location
))
228 ;; If NAME has an existing structure slot source-transform and DEF does not
229 ;; coincide with the transform, then blow away the transform.
230 ;; It's important for the interpreter to do this because we prefer to
231 ;; use the transform when it exists - which is presently achieved by calling
232 ;; COMPILE on NAME. But we need to ensure that it is correct to call COMPILE
233 ;; on NAME in a null environment even if it appeared inside a toplevel LET.
234 ;; The indication of whether this will work is that DEF matches the
235 ;; expected source-transform for NAME. Users should not care that NAME
236 ;; ever got temporarily defined as an interpreted function.
237 ;; Arguably (SETF FDEFINITION) and FMAKUNBOUND should do this check too,
238 ;; but one would hope that those operations on compiler-defined functions
239 ;; are uncommon enough that this makes no difference.
240 ;; *** See also https://bugs.launchpad.net/sbcl/+bug/540063
242 (awhen (and (sb!interpreter
:interpreted-function-p def
)
243 (structure-instance-accessor-p name
))
244 (unless (structure-accessor-form-p
245 (if (consp name
) :setf
:read
) it
246 (sb!interpreter
:fun-lambda-list def
)
247 (sb!interpreter
::fun-forms def
))
248 (clear-info :function
:source-transform name
)
249 (warn "structure slot accessor ~S incompatibly redefined" name
)))
250 (setf (sb!xc
:fdefinition name
) def
)
251 ;; %COMPILER-DEFUN doesn't do this except at compile-time, when it
252 ;; also checks package locks. By doing this here we let (SETF
253 ;; FDEFINITION) do the load-time package lock checking before
254 ;; we frob any existing inline expansions.
255 (sb!c
::%set-inline-expansion name nil inline-lambda
)
256 (sb!c
::note-name-defined name
:function
)
258 ;; During cold-init we don't touch the fdefinition.
259 (defun !%quietly-defun
(name inline-lambda
)
260 (sb!c
:%compiler-defun
name nil nil
) ; makes :WHERE-FROM = :DEFINED
261 (sb!c
::%set-inline-expansion name nil inline-lambda
)
262 ;; and no need to call NOTE-NAME-DEFINED. It would do nothing.
265 ;; Return T if LAMBDA-LIST and FORMS make up to the lambda expression
266 ;; that corresponds to the structure slot accessor for SLOT-INFO so
267 ;; that we can decide that an interpreted lambda is consistent with
268 ;; its source-transform. I think there's actually a better way than
269 ;; this heuristic: *always* remove a source-transform whenever an
270 ;; fdefn-fun is set, with a blanket exception for boostrap code. Then
271 ;; %TARGET-DEFSTRUCT, which is the last step to occur from DEFSTRUCT,
272 ;; can re-establish the source-transforms.
273 (defun structure-accessor-form-p (kind slot-info lambda-list forms
)
274 (let ((expected-lambda-list
277 (:write
'(sb!kernel
::value instance
)))))
278 (when (and (equal lambda-list expected-lambda-list
)
280 (let ((form (car forms
)))
281 ;; FORM must match (BLOCK x subform)
282 (and (typep form
'(cons (eql block
) (cons t
(cons t null
))))
284 (slot-access-transform
285 kind
(reverse expected-lambda-list
) slot-info
)))))))
287 ;;;; DEFVAR and DEFPARAMETER
289 (defmacro-mundanely defvar
(var &optional
(val nil valp
) (doc nil docp
))
291 "Define a special variable at top level. Declare the variable
292 SPECIAL and, optionally, initialize it. If the variable already has a
293 value, the old value is not clobbered. The third argument is an optional
294 documentation string for the variable."
296 (eval-when (:compile-toplevel
)
297 (%compiler-defvar
',var
))
299 (sb!c
:source-location
)
301 `((unless (boundp ',var
) ,val
)))
305 (defmacro-mundanely defparameter
(var val
&optional
(doc nil docp
))
307 "Define a parameter that is not normally changed by the program,
308 but that may be changed without causing an error. Declare the
309 variable special and sets its value to VAL, overwriting any
310 previous value. The third argument is an optional documentation
311 string for the parameter."
313 (eval-when (:compile-toplevel
)
314 (%compiler-defvar
',var
))
315 (%defparameter
',var
,val
(sb!c
:source-location
)
319 (defun %compiler-defvar
(var)
320 (sb!xc
:proclaim
`(special ,var
)))
323 (defun %defvar
(var source-location
&optional
(val nil valp
) (doc nil docp
))
324 (%compiler-defvar var
)
329 (setf (fdocumentation var
'variable
) doc
))
330 (sb!c
:with-source-location
(source-location)
331 (setf (info :source-location
:variable var
) source-location
))
335 (defun %defparameter
(var val source-location
&optional
(doc nil docp
))
336 (%compiler-defvar var
)
339 (setf (fdocumentation var
'variable
) doc
))
340 (sb!c
:with-source-location
(source-location)
341 (setf (info :source-location
:variable var
) source-location
))
344 ;;;; iteration constructs
346 ;;; (These macros are defined in terms of a function FROB-DO-BODY which
347 ;;; is also used by SB!INT:DO-ANONYMOUS. Since these macros should not
348 ;;; be loaded on the cross-compilation host, but SB!INT:DO-ANONYMOUS
349 ;;; and FROB-DO-BODY should be, these macros can't conveniently be in
350 ;;; the same file as FROB-DO-BODY.)
351 (defmacro-mundanely do
(varlist endlist
&body body
)
353 "DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
354 Iteration construct. Each Var is initialized in parallel to the value of the
355 specified Init form. On subsequent iterations, the Vars are assigned the
356 value of the Step form (if any) in parallel. The Test is evaluated before
357 each evaluation of the body Forms. When the Test is true, the Exit-Forms
358 are evaluated as a PROGN, with the result being the value of the DO. A block
359 named NIL is established around the entire expansion, allowing RETURN to be
360 used as an alternate exit mechanism."
361 (frob-do-body varlist endlist body
'let
'psetq
'do nil
))
362 (defmacro-mundanely do
* (varlist endlist
&body body
)
364 "DO* ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
365 Iteration construct. Each Var is initialized sequentially (like LET*) to the
366 value of the specified Init form. On subsequent iterations, the Vars are
367 sequentially assigned the value of the Step form (if any). The Test is
368 evaluated before each evaluation of the body Forms. When the Test is true,
369 the Exit-Forms are evaluated as a PROGN, with the result being the value
370 of the DO. A block named NIL is established around the entire expansion,
371 allowing RETURN to be used as an alternate exit mechanism."
372 (frob-do-body varlist endlist body
'let
* 'setq
'do
* nil
))
374 ;;; DOTIMES and DOLIST could be defined more concisely using
375 ;;; destructuring macro lambda lists or DESTRUCTURING-BIND, but then
376 ;;; it'd be tricky to use them before those things were defined.
377 ;;; They're used enough times before destructuring mechanisms are
378 ;;; defined that it looks as though it's worth just implementing them
379 ;;; ASAP, at the cost of being unable to use the standard
380 ;;; destructuring mechanisms.
381 (defmacro-mundanely dotimes
((var count
&optional
(result nil
)) &body body
)
382 (cond ((integerp count
)
383 `(do ((,var
0 (1+ ,var
)))
384 ((>= ,var
,count
) ,result
)
385 (declare (type unsigned-byte
,var
))
388 (let ((c (gensym "COUNT")))
389 `(do ((,var
0 (1+ ,var
))
391 ((>= ,var
,c
) ,result
)
392 (declare (type unsigned-byte
,var
)
396 (defmacro-mundanely dolist
((var list
&optional
(result nil
)) &body body
&environment env
)
397 ;; We repeatedly bind the var instead of setting it so that we never
398 ;; have to give the var an arbitrary value such as NIL (which might
399 ;; conflict with a declaration). If there is a result form, we
400 ;; introduce a gratuitous binding of the variable to NIL without the
401 ;; declarations, then evaluate the result form in that
402 ;; environment. We spuriously reference the gratuitous variable,
403 ;; since we don't want to use IGNORABLE on what might be a special
405 (multiple-value-bind (forms decls
) (parse-body body
:doc-string-allowed nil
)
406 (let* ((n-list (gensym "N-LIST"))
407 (start (gensym "START")))
408 (multiple-value-bind (clist members clist-ok
)
409 (cond ((sb!xc
:constantp list env
)
410 (let ((value (constant-form-value list env
)))
411 (multiple-value-bind (all dot
) (list-members value
:max-length
20)
413 ;; Full warning is too much: the user may terminate the loop
414 ;; early enough. Contents are still right, though.
415 (style-warn "Dotted list ~S in DOLIST." value
))
417 (values value nil nil
)
418 (values value all t
)))))
419 ((and (consp list
) (eq 'list
(car list
))
420 (every (lambda (arg) (sb!xc
:constantp arg env
)) (cdr list
)))
421 (let ((values (mapcar (lambda (arg) (constant-form-value arg env
)) (cdr list
))))
422 (values values values t
)))
424 (values nil nil nil
)))
426 (let ((,n-list
,(if clist-ok
(list 'quote clist
) list
)))
429 (unless (endp ,n-list
)
430 (let ((,var
,(if clist-ok
431 `(truly-the (member ,@members
) (car ,n-list
))
434 (setq ,n-list
(cdr ,n-list
))
439 ;; Filter out TYPE declarations (VAR gets bound to NIL,
440 ;; and might have a conflicting type declaration) and
441 ;; IGNORE (VAR might be ignored in the loop body, but
442 ;; it's used in the result form).
443 ,@(filter-dolist-declarations decls
)
448 ;;;; conditions, handlers, restarts
450 ;;; KLUDGE: we PROCLAIM these special here so that we can use restart
451 ;;; macros in the compiler before the DEFVARs are compiled.
453 ;;; For an explanation of these data structures, see DEFVARs in
454 ;;; target-error.lisp.
455 (sb!xc
:proclaim
'(special *handler-clusters
* *restart-clusters
*))
457 ;;; Generated code need not check for unbound-marker in *HANDLER-CLUSTERS*
458 ;;; (resp *RESTART-). To elicit this we must poke at the info db.
459 ;;; SB!XC:PROCLAIM SPECIAL doesn't advise the host Lisp that *HANDLER-CLUSTERS*
460 ;;; is special and so it rightfully complains about a SETQ of the variable.
461 ;;; But I must SETQ if proclaming ALWAYS-BOUND because the xc asks the host
462 ;;; whether it's currently bound.
463 ;;; But the DEFVARs are in target-error. So it's one hack or another.
464 (setf (info :variable
:always-bound
'*handler-clusters
*)
465 #+sb-xc
:always-bound
#-sb-xc
:eventually
)
466 (setf (info :variable
:always-bound
'*restart-clusters
*)
467 #+sb-xc
:always-bound
#-sb-xc
:eventually
)
469 (defmacro-mundanely with-condition-restarts
470 (condition-form restarts-form
&body body
)
472 "Evaluates the BODY in a dynamic environment where the restarts in the list
473 RESTARTS-FORM are associated with the condition returned by CONDITION-FORM.
474 This allows FIND-RESTART, etc., to recognize restarts that are not related
475 to the error currently being debugged. See also RESTART-CASE."
476 (once-only ((condition-form condition-form
)
477 (restarts restarts-form
))
478 (with-unique-names (restart)
479 ;; FIXME: check the need for interrupt-safety.
482 (dolist (,restart
,restarts
)
483 (push ,condition-form
484 (restart-associated-conditions ,restart
)))
486 (dolist (,restart
,restarts
)
487 (pop (restart-associated-conditions ,restart
)))))))
489 (defmacro-mundanely restart-bind
(bindings &body forms
)
491 "(RESTART-BIND ({(case-name function {keyword value}*)}*) forms)
492 Executes forms in a dynamic context where the given bindings are in
493 effect. Users probably want to use RESTART-CASE. A case-name of NIL
494 indicates an anonymous restart. When bindings contain the same
495 restart name, FIND-RESTART will find the first such binding."
496 (flet ((parse-binding (binding)
497 (unless (>= (length binding
) 2)
498 (error "ill-formed restart binding: ~S" binding
))
499 (destructuring-bind (name function
500 &key interactive-function
504 (unless (or name report-function
)
505 (warn "Unnamed restart does not have a report function: ~
507 `(make-restart ',name
,function
508 ,@(and (or report-function
512 ,@(and (or interactive-function
514 `(,interactive-function
))
516 `(,test-function
))))))
517 `(let ((*restart-clusters
*
518 (cons (list ,@(mapcar #'parse-binding bindings
))
519 *restart-clusters
*)))
520 (declare (truly-dynamic-extent *restart-clusters
*))
523 ;;; Wrap the RESTART-CASE expression in a WITH-CONDITION-RESTARTS if
524 ;;; appropriate. Gross, but it's what the book seems to say...
525 (defun munge-restart-case-expression (expression env
)
526 (let ((exp (%macroexpand expression env
)))
528 (let* ((name (car exp
))
529 (args (if (eq name
'cerror
) (cddr exp
) (cdr exp
))))
530 (if (member name
'(signal error cerror warn
))
531 (once-only ((n-cond `(coerce-to-condition
535 (warn 'simple-warning
)
536 (signal 'simple-condition
)
539 `(with-condition-restarts
541 (car *restart-clusters
*)
542 ,(if (eq name
'cerror
)
543 `(cerror ,(second exp
) ,n-cond
)
548 (defmacro-mundanely restart-case
(expression &body clauses
&environment env
)
550 "(RESTART-CASE form {(case-name arg-list {keyword value}* body)}*)
551 The form is evaluated in a dynamic context where the clauses have
552 special meanings as points to which control may be transferred (see
553 INVOKE-RESTART). When clauses contain the same case-name,
554 FIND-RESTART will find the first such clause. If form is a call to
555 SIGNAL, ERROR, CERROR or WARN (or macroexpands into such) then the
556 signalled condition will be associated with the new restarts."
557 ;; PARSE-CLAUSE (which uses PARSE-KEYWORDS-AND-BODY) is used to
558 ;; parse all clauses into lists of the form
560 ;; (NAME TAG KEYWORDS LAMBDA-LIST BODY)
562 ;; where KEYWORDS are suitable keywords for use in HANDLER-BIND
563 ;; bindings. These lists are then passed to
564 ;; * MAKE-BINDING which generates bindings for the respective NAME
566 ;; * MAKE-APPLY-AND-RETURN which generates TAGBODY entries executing
567 ;; the respective BODY.
568 (let ((block-tag (sb!xc
:gensym
"BLOCK"))
570 (labels ((parse-keywords-and-body (keywords-and-body)
571 (do ((form keywords-and-body
(cddr form
))
573 (destructuring-bind (&optional key
(arg nil argp
) &rest rest
)
575 (declare (ignore rest
))
579 ((and (eq key
:report
) argp
)
580 (list :report-function
583 (write-string ,arg stream
))
585 ((and (eq key
:interactive
) argp
)
586 (list :interactive-function
`#',arg
))
587 ((and (eq key
:test
) argp
)
588 (list :test-function
`#',arg
))
590 (return (values result form
))))
592 (parse-clause (clause)
593 (unless (and (listp clause
) (>= (length clause
) 2)
594 (listp (second clause
)))
595 (error "ill-formed ~S clause, no lambda-list:~% ~S"
596 'restart-case clause
))
597 (destructuring-bind (name lambda-list
&body body
) clause
598 (multiple-value-bind (keywords body
)
599 (parse-keywords-and-body body
)
600 (list name
(sb!xc
:gensym
"TAG") keywords lambda-list body
))))
601 (make-binding (clause-data)
602 (destructuring-bind (name tag keywords lambda-list body
) clause-data
603 (declare (ignore body
))
605 (lambda ,(cond ((null lambda-list
)
607 ((and (null (cdr lambda-list
))
608 (not (member (car lambda-list
)
609 '(&optional
&key
&aux
))))
613 ,@(when lambda-list
`((setq ,temp-var temp
)))
614 (locally (declare (optimize (safety 0)))
617 (make-apply-and-return (clause-data)
618 (destructuring-bind (name tag keywords lambda-list body
) clause-data
619 (declare (ignore name keywords
))
620 `(,tag
(return-from ,block-tag
621 ,(cond ((null lambda-list
)
623 ((and (null (cdr lambda-list
))
624 (not (member (car lambda-list
)
625 '(&optional
&key
&aux
))))
626 `(funcall (lambda ,lambda-list
,@body
) ,temp-var
))
628 `(apply (lambda ,lambda-list
,@body
) ,temp-var
))))))))
629 (let ((clauses-data (mapcar #'parse-clause clauses
)))
631 (let ((,temp-var nil
))
632 (declare (ignorable ,temp-var
))
635 ,(mapcar #'make-binding clauses-data
)
636 (return-from ,block-tag
637 ,(munge-restart-case-expression expression env
)))
638 ,@(mapcan #'make-apply-and-return clauses-data
))))))))
640 (defmacro-mundanely with-simple-restart
((restart-name format-string
641 &rest format-arguments
)
644 "(WITH-SIMPLE-RESTART (restart-name format-string format-arguments)
646 If restart-name is not invoked, then all values returned by forms are
647 returned. If control is transferred to this restart, it immediately
648 returns the values NIL and T."
649 (let ((stream (sb!xc
:gensym
"STREAM")))
651 ;; If there's just one body form, then don't use PROGN. This allows
652 ;; RESTART-CASE to "see" calls to ERROR, etc.
653 ,(if (= (length forms
) 1) (car forms
) `(progn ,@forms
))
655 :report
(lambda (,stream
)
656 (declare (type stream
,stream
))
657 (format ,stream
,format-string
,@format-arguments
))
660 (defmacro-mundanely %handler-bind
(bindings form
&environment env
)
662 (return-from %handler-bind form
))
663 ;; As an optimization, this looks at the handler parts of BINDINGS
664 ;; and turns handlers of the forms (lambda ...) and (function
665 ;; (lambda ...)) into local, dynamic-extent functions.
667 ;; Type specifiers in BINDINGS which name classoids are parsed
668 ;; into the classoid, otherwise are translated local TYPEP wrappers.
670 ;; As a further optimization, it is possible to eliminate some runtime
671 ;; consing (which is a speed win if not a space win, since it's dx already)
672 ;; in special cases such as (HANDLER-BIND ((WARNING #'MUFFLE-WARNING)) ...).
673 ;; If all bindings are optimizable, then the runtime cost of making them
674 ;; is one dx cons cell for the whole cluster.
675 ;; Otherwise it takes 1+2N cons cells where N is the number of bindings.
677 (collect ((local-functions) (cluster-entries) (dummy-forms))
678 (flet ((const-cons (test handler
)
679 ;; If possible, render HANDLER as a load-time constant so that
680 ;; consing the test and handler is also load-time constant.
681 (let ((name (when (typep handler
682 '(cons (member function quote
)
685 (cond ((or (not name
)
686 (assq name
(local-functions))
687 (and (eq (car handler
) 'function
)
688 (sb!c
::fun-locally-defined-p name env
)))
689 `(cons ,(case (car test
)
690 ((named-lambda function
) test
)
691 (t `(load-time-value ,test t
)))
692 ,(if (typep handler
'(cons (eql function
)))
694 ;; Regardless of lexical policy, never allow
695 ;; a non-callable into handler-clusters.
697 (declare (optimize (safety 3)))
699 ((info :function
:info name
) ; known
700 ;; This takes care of CONTINUE,ABORT,MUFFLE-WARNING.
701 ;; #' will be evaluated in the null environment.
702 `(load-time-value (cons ,test
#',name
) t
))
704 ;; For each handler specified as #'F we must verify
705 ;; that F is fboundp upon entering the binding scope.
706 ;; Referencing #'F is enough to ensure a warning if the
707 ;; function isn't defined at compile-time, but the
708 ;; compiler considers it elidable unless something forces
709 ;; an apparent use of the form at runtime,
710 ;; so instead use SAFE-FDEFN-FUN on the fdefn.
711 (when (eq (car handler
) 'function
)
712 (dummy-forms `(sb!c
:safe-fdefn-fun
714 (find-or-create-fdefn ',name
) t
))))
715 ;; Resolve to an fdefn at load-time.
717 (cons ,test
(find-or-create-fdefn ',name
))
721 ;; If the resultant list is (LIST (L-T-V ...) (L-T-V ...) ...)
722 ;; then pull the L-T-V outside.
723 (if (every (lambda (x) (typep x
'(cons (eql load-time-value
))))
725 `(load-time-value (list ,@(mapcar #'second items
)) t
)
728 (dolist (binding bindings
)
729 (unless (proper-list-of-length-p binding
2)
730 (error "ill-formed handler binding: ~S" binding
))
731 (destructuring-bind (type handler
) binding
732 (setq type
(typexpand type env
))
733 ;; Simplify a singleton AND or OR.
734 (when (typep type
'(cons (member and or
) (cons t null
)))
735 (setf type
(second type
)))
738 ;; Compute the test expression
739 (cond ((member type
'(t condition
))
740 ;; Every signal is necesarily a CONDITION, so whether you
741 ;; wrote T or CONDITION, this is always an eligible handler.
743 ((typep type
'(cons (eql satisfies
) (cons t null
)))
744 ;; (SATISFIES F) => #'F but never a local definition of F.
745 ;; The predicate is used only if needed - it's not an error
746 ;; if not fboundp (though dangerously stupid) - so just
747 ;; reference #'F for the compiler to see the use of the name.
748 ;; But (KLUDGE): since the ref is to force a compile-time
749 ;; effect, the interpreter should not see that form,
750 ;; because there is no way for it to perform an unsafe ref,
751 ;; (and it wouldn't signal a style-warning anyway),
752 ;; and so it would actually fail immediately if predicate
754 (let ((name (second type
)))
755 (when (typep env
'lexenv
)
756 (dummy-forms `#',name
))
757 `(find-or-create-fdefn ',name
)))
759 (condition-classoid-p (find-classoid type nil
)))
760 ;; It's debatable whether we need to go through a
761 ;; classoid-cell instead of just using load-time-value
762 ;; on FIND-CLASS, but the extra indirection is
763 ;; safer, and no slower than what TYPEP does.
764 `(find-classoid-cell ',type
:create t
))
765 (t ; No runtime consing here- this is not a closure.
766 `(named-lambda (%handler-bind
,type
) (c)
767 (declare (optimize (sb!c
::verify-arg-count
0)))
769 ;; Compute the handler expression
770 (let ((lexpr (typecase handler
771 ((cons (eql lambda
)) handler
)
772 ((cons (eql function
)
773 (cons (cons (eql lambda
)) null
))
776 (let ((name (let ((sb!xc
:*gensym-counter
*
777 (length (cluster-entries))))
778 (sb!xc
:gensym
"H"))))
779 (local-functions `(,name
,@(rest lexpr
)))
783 `(dx-flet ,(local-functions)
785 (dx-let ((*handler-clusters
*
786 (cons ,(const-list (cluster-entries))
787 *handler-clusters
*)))
790 (defmacro-mundanely handler-bind
(bindings &body forms
)
792 "(HANDLER-BIND ( {(type handler)}* ) body)
794 Executes body in a dynamic context where the given handler bindings are in
795 effect. Each handler must take the condition being signalled as an argument.
796 The bindings are searched first to last in the event of a signalled
798 ;; Bindings which meet specific criteria can be established with
799 ;; slightly less runtime overhead than in general.
800 ;; To allow the optimization, TYPE must be either be (SATISFIES P)
801 ;; or a symbol naming a condition class at compile time,
802 ;; and HANDLER must be a global function specified as either 'F or #'F.
803 `(%handler-bind
,bindings
804 #!-x86
(progn ,@forms
)
805 ;; Need to catch FP errors here!
806 #!+x86
(multiple-value-prog1 (progn ,@forms
) (float-wait))))
808 (defmacro-mundanely handler-case
(form &rest cases
)
810 "(HANDLER-CASE form { (type ([var]) body) }* )
812 Execute FORM in a context with handlers established for the condition types. A
813 peculiar property allows type to be :NO-ERROR. If such a clause occurs, and
814 form returns normally, all its values are passed to this clause as if by
815 MULTIPLE-VALUE-CALL. The :NO-ERROR clause accepts more than one var
817 (let ((no-error-clause (assoc ':no-error cases
)))
819 (let ((normal-return (make-symbol "normal-return"))
820 (error-return (make-symbol "error-return")))
821 `(block ,error-return
822 (multiple-value-call (lambda ,@(cdr no-error-clause
))
823 (block ,normal-return
824 (return-from ,error-return
825 (handler-case (return-from ,normal-return
,form
)
826 ,@(remove no-error-clause cases
)))))))
827 (let* ((local-funs nil
)
829 (mapcar (lambda (case)
830 (with-unique-names (tag fun
)
831 (destructuring-bind (type ll
&body body
) case
832 (push `(,fun
,ll
,@body
) local-funs
)
833 (list tag type ll fun
))))
835 (with-unique-names (block cell form-fun
)
836 `(dx-flet ((,form-fun
()
838 ;; Need to catch FP errors here!
839 #!+x86
(multiple-value-prog1 ,form
(float-wait)))
840 ,@(reverse local-funs
))
841 (declare (optimize (sb!c
::check-tag-existence
0)))
843 ;; KLUDGE: We use a dx CONS cell instead of just assigning to
844 ;; the variable directly, so that we can stack allocate
845 ;; robustly: dx value cells don't work quite right, and it is
846 ;; possible to construct user code that should loop
847 ;; indefinitely, but instead eats up some stack each time
849 (dx-let ((,cell
(cons :condition nil
)))
850 (declare (ignorable ,cell
))
853 ,(mapcar (lambda (annotated-case)
854 (destructuring-bind (tag type ll fun-name
) annotated-case
855 (declare (ignore fun-name
))
859 `(setf (cdr ,cell
) temp
)
860 '(declare (ignore temp
)))
863 (return-from ,block
(,form-fun
)))
865 (lambda (annotated-case)
866 (destructuring-bind (tag type ll fun-name
) annotated-case
867 (declare (ignore type
))
871 `(,fun-name
(cdr ,cell
))
873 annotated-cases
))))))))))
877 (defmacro-mundanely return
(&optional
(value nil
))
878 `(return-from nil
,value
))
880 (defmacro-mundanely lambda
(&whole whole args
&body body
)
881 (declare (ignore args body
))
884 (defmacro-mundanely named-lambda
(&whole whole name args
&body body
)
885 (declare (ignore name args body
))
888 (defmacro-mundanely lambda-with-lexenv
(&whole whole
889 declarations macros symbol-macros
891 (declare (ignore declarations macros symbol-macros body
))