src/code/defboot.lisp

   1 ;;;; bootstrapping fundamental machinery (e.g. DEFUN, DEFCONSTANT,
   2 ;;;; DEFVAR) from special forms and primitive functions
   3 ;;;;
   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.
  11
  12 ;;;; This software is part of the SBCL system. See the README file for
  13 ;;;; more information.
  14 ;;;;
  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.
  20
  21 (in-package "SB!IMPL")
  22 \f
  23 ;;;; IN-PACKAGE
  24
  25 (defmacro-mundanely in-package (package-designator)
  26   `(eval-when (:compile-toplevel :load-toplevel :execute)
  27      (setq *package* (find-undeleted-package-or-lose ',package-designator))))
  28 \f
  29 ;;;; MULTIPLE-VALUE-FOO
  30
  31 (defun list-of-symbols-p (x)
  32   (and (listp x)
  33        (every #'symbolp x)))
  34
  35 (defmacro-mundanely multiple-value-bind (vars value-form &body body)
  36   (if (list-of-symbols-p vars)
  37     ;; It's unclear why it would be important to special-case the LENGTH=1 case
  38     ;; at this level, but the CMU CL code did it, so.. -- WHN 19990411
  39     (if (= (length vars) 1)
  40       `(let ((,(car vars) ,value-form))
  41          ,@body)
  42       (let ((ignore (gensym)))
  43         `(multiple-value-call #'(lambda (&optional ,@vars &rest ,ignore)
  44                                   (declare (ignore ,ignore))
  45                                   ,@body)
  46                               ,value-form)))
  47     (error "Vars is not a list of symbols: ~S" vars)))
  48
  49 (defmacro-mundanely multiple-value-setq (vars value-form)
  50   (unless (list-of-symbols-p vars)
  51     (error "Vars is not a list of symbols: ~S" vars))
  52   `(values (setf (values ,@vars) ,value-form)))
  53
  54 (defmacro-mundanely multiple-value-list (value-form)
  55   `(multiple-value-call #'list ,value-form))
  56 \f
  57 ;;;; various conditional constructs
  58
  59 ;;; COND defined in terms of IF
  60 (defmacro-mundanely cond (&rest clauses)
  61   (if (endp clauses)
  62       nil
  63       (let ((clause (first clauses)))
  64         (if (atom clause)
  65             (error "COND clause is not a list: ~S" clause)
  66             (let ((test (first clause))
  67                   (forms (rest clause)))
  68               (if (endp forms)
  69                   (let ((n-result (gensym)))
  70                     `(let ((,n-result ,test))
  71                        (if ,n-result
  72                            ,n-result
  73                            (cond ,@(rest clauses)))))
  74                   `(if ,test
  75                        (progn ,@forms)
  76                        (cond ,@(rest clauses)))))))))
  77
  78 ;;; other things defined in terms of COND
  79 (defmacro-mundanely when (test &body forms)
  80   #!+sb-doc
  81   "If the first argument is true, the rest of the forms are
  82   evaluated as a PROGN."
  83   `(cond (,test nil ,@forms)))
  84 (defmacro-mundanely unless (test &body forms)
  85   #!+sb-doc
  86   "If the first argument is not true, the rest of the forms are
  87   evaluated as a PROGN."
  88   `(cond ((not ,test) nil ,@forms)))
  89 (defmacro-mundanely and (&rest forms)
  90   (cond ((endp forms) t)
  91         ((endp (rest forms)) (first forms))
  92         (t
  93          `(if ,(first forms)
  94               (and ,@(rest forms))
  95               nil))))
  96 (defmacro-mundanely or (&rest forms)
  97   (cond ((endp forms) nil)
  98         ((endp (rest forms)) (first forms))
  99         (t
 100          (let ((n-result (gensym)))
 101            `(let ((,n-result ,(first forms)))
 102               (if ,n-result
 103                   ,n-result
 104                   (or ,@(rest forms))))))))
 105 \f
 106 ;;;; various sequencing constructs
 107
 108 (flet ((prog-expansion-from-let (varlist body-decls let)
 109          (multiple-value-bind (body decls)
 110              (parse-body body-decls :doc-string-allowed nil)
 111            `(block nil
 112               (,let ,varlist
 113                 ,@decls
 114                 (tagbody ,@body))))))
 115   (defmacro-mundanely prog (varlist &body body-decls)
 116     (prog-expansion-from-let varlist body-decls 'let))
 117   (defmacro-mundanely prog* (varlist &body body-decls)
 118     (prog-expansion-from-let varlist body-decls 'let*)))
 119
 120 (defmacro-mundanely prog1 (result &body body)
 121   (let ((n-result (gensym)))
 122     `(let ((,n-result ,result))
 123        ,@body
 124        ,n-result)))
 125
 126 (defmacro-mundanely prog2 (form1 result &body body)
 127   `(prog1 (progn ,form1 ,result) ,@body))
 128 \f
 129 ;;;; DEFUN
 130
 131 ;;; Should we save the inline expansion of the function named NAME?
 132 (defun inline-fun-name-p (name)
 133   (or
 134    ;; the normal reason for saving the inline expansion
 135    (info :function :inlinep name)
 136    ;; another reason for saving the inline expansion: If the
 137    ;; ANSI-recommended idiom
 138    ;;   (DECLAIM (INLINE FOO))
 139    ;;   (DEFUN FOO ..)
 140    ;;   (DECLAIM (NOTINLINE FOO))
 141    ;; has been used, and then we later do another
 142    ;;   (DEFUN FOO ..)
 143    ;; without a preceding
 144    ;;   (DECLAIM (INLINE FOO))
 145    ;; what should we do with the old inline expansion when we see the
 146    ;; new DEFUN? Overwriting it with the new definition seems like
 147    ;; the only unsurprising choice.
 148    (info :function :inline-expansion-designator name)))
 149
 150 (defmacro-mundanely defun (&environment env name args &body body)
 151   "Define a function at top level."
 152   #+sb-xc-host
 153   (unless (symbol-package (fun-name-block-name name))
 154     (warn "DEFUN of uninterned symbol ~S (tricky for GENESIS)" name))
 155   (multiple-value-bind (forms decls doc) (parse-body body)
 156     (let* (;; stuff shared between LAMBDA and INLINE-LAMBDA and NAMED-LAMBDA
 157            (lambda-guts `(,args
 158                           ,@decls
 159                           (block ,(fun-name-block-name name)
 160                             ,@forms)))
 161            (lambda `(lambda ,@lambda-guts))
 162            #-sb-xc-host
 163            (named-lambda `(named-lambda ,name ,@lambda-guts))
 164            (inline-lambda
 165             (when (inline-fun-name-p name)
 166               ;; we want to attempt to inline, so complain if we can't
 167               (or (sb!c:maybe-inline-syntactic-closure lambda env)
 168                   (progn
 169                     (#+sb-xc-host warn
 170                      #-sb-xc-host sb!c:maybe-compiler-notify
 171                      "lexical environment too hairy, can't inline DEFUN ~S"
 172                      name)
 173                     nil)))))
 174       `(progn
 175
 176          ;; In cross-compilation of toplevel DEFUNs, we arrange
 177          ;; for the LAMBDA to be statically linked by GENESIS.
 178          ;;
 179          ;; It may seem strangely inconsistent not to use NAMED-LAMBDA
 180          ;; here instead of LAMBDA. The reason is historical:
 181          ;; COLD-FSET was written before NAMED-LAMBDA, and has special
 182          ;; logic of its own to notify the compiler about NAME.
 183          #+sb-xc-host
 184          (cold-fset ,name ,lambda)
 185
 186          (eval-when (:compile-toplevel :load-toplevel :execute)
 187            (sb!c:%compiler-defun ',name ',inline-lambda))
 188
 189          (%defun ',name
 190                  ;; In normal compilation (not for cold load) this is
 191                  ;; where the compiled LAMBDA first appears. In
 192                  ;; cross-compilation, we manipulate the
 193                  ;; previously-statically-linked LAMBDA here.
 194                  #-sb-xc-host ,named-lambda
 195                  #+sb-xc-host (fdefinition ',name)
 196                  ,doc)))))
 197 #-sb-xc-host
 198 (defun %defun (name def doc)
 199   (declare (type function def))
 200   (declare (type (or null simple-string) doc))
 201   (aver (legal-fun-name-p name)) ; should've been checked by DEFMACRO DEFUN
 202   (when (fboundp name)
 203     (/show0 "redefining NAME in %DEFUN")
 204     (style-warn "redefining ~S in DEFUN" name))
 205   (setf (sb!xc:fdefinition name) def)
 206
 207   ;; FIXME: I want to do this here (and fix bug 137), but until the
 208   ;; breathtaking CMU CL function name architecture is converted into
 209   ;; something sane, (1) doing so doesn't really fix the bug, and
 210   ;; (2) doing probably isn't even really safe.
 211   #+nil (setf (%fun-name def) name)
 212
 213   (when doc
 214     (setf (fdocumentation name 'function) doc))
 215   name)
 216 \f
 217 ;;;; DEFVAR and DEFPARAMETER
 218
 219 (defmacro-mundanely defvar (var &optional (val nil valp) (doc nil docp))
 220   #!+sb-doc
 221   "Define a global variable at top level. Declare the variable
 222   SPECIAL and, optionally, initialize it. If the variable already has a
 223   value, the old value is not clobbered. The third argument is an optional
 224   documentation string for the variable."
 225   `(progn
 226      (declaim (special ,var))
 227      ,@(when valp
 228          `((unless (boundp ',var)
 229              (set ',var ,val))))
 230      ,@(when docp
 231          `((setf (fdocumentation ',var 'variable) ',doc )))
 232      ',var))
 233
 234 (defmacro-mundanely defparameter (var val &optional (doc nil docp))
 235   #!+sb-doc
 236   "Define a parameter that is not normally changed by the program,
 237   but that may be changed without causing an error. Declare the
 238   variable special and sets its value to VAL, overwriting any
 239   previous value. The third argument is an optional documentation
 240   string for the parameter."
 241   `(progn
 242      (declaim (special ,var))
 243      (set ',var ,val)
 244      ,@(when docp
 245          `((setf (fdocumentation ',var 'variable) ',doc)))
 246      ',var))
 247 \f
 248 ;;;; iteration constructs
 249
 250 ;;; (These macros are defined in terms of a function FROB-DO-BODY which
 251 ;;; is also used by SB!INT:DO-ANONYMOUS. Since these macros should not
 252 ;;; be loaded on the cross-compilation host, but SB!INT:DO-ANONYMOUS
 253 ;;; and FROB-DO-BODY should be, these macros can't conveniently be in
 254 ;;; the same file as FROB-DO-BODY.)
 255 (defmacro-mundanely do (varlist endlist &body body)
 256   #!+sb-doc
 257   "DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
 258   Iteration construct. Each Var is initialized in parallel to the value of the
 259   specified Init form. On subsequent iterations, the Vars are assigned the
 260   value of the Step form (if any) in parallel. The Test is evaluated before
 261   each evaluation of the body Forms. When the Test is true, the Exit-Forms
 262   are evaluated as a PROGN, with the result being the value of the DO. A block
 263   named NIL is established around the entire expansion, allowing RETURN to be
 264   used as an alternate exit mechanism."
 265   (frob-do-body varlist endlist body 'let 'psetq 'do nil))
 266 (defmacro-mundanely do* (varlist endlist &body body)
 267   #!+sb-doc
 268   "DO* ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
 269   Iteration construct. Each Var is initialized sequentially (like LET*) to the
 270   value of the specified Init form. On subsequent iterations, the Vars are
 271   sequentially assigned the value of the Step form (if any). The Test is
 272   evaluated before each evaluation of the body Forms. When the Test is true,
 273   the Exit-Forms are evaluated as a PROGN, with the result being the value
 274   of the DO. A block named NIL is established around the entire expansion,
 275   allowing RETURN to be used as an laternate exit mechanism."
 276   (frob-do-body varlist endlist body 'let* 'setq 'do* nil))
 277
 278 ;;; DOTIMES and DOLIST could be defined more concisely using
 279 ;;; destructuring macro lambda lists or DESTRUCTURING-BIND, but then
 280 ;;; it'd be tricky to use them before those things were defined.
 281 ;;; They're used enough times before destructuring mechanisms are
 282 ;;; defined that it looks as though it's worth just implementing them
 283 ;;; ASAP, at the cost of being unable to use the standard
 284 ;;; destructuring mechanisms.
 285 (defmacro-mundanely dotimes ((var count &optional (result nil)) &body body)
 286   (cond ((numberp count)
 287          `(do ((,var 0 (1+ ,var)))
 288               ((>= ,var ,count) ,result)
 289             (declare (type unsigned-byte ,var))
 290             ,@body))
 291         (t (let ((v1 (gensym)))
 292              `(do ((,var 0 (1+ ,var)) (,v1 ,count))
 293                   ((>= ,var ,v1) ,result)
 294                 (declare (type unsigned-byte ,var))
 295                 ,@body)))))
 296
 297 (defmacro-mundanely dolist ((var list &optional (result nil)) &body body)
 298   ;; We repeatedly bind the var instead of setting it so that we never
 299   ;; have to give the var an arbitrary value such as NIL (which might
 300   ;; conflict with a declaration). If there is a result form, we
 301   ;; introduce a gratuitous binding of the variable to NIL without the
 302   ;; declarations, then evaluate the result form in that
 303   ;; environment. We spuriously reference the gratuitous variable,
 304   ;; since we don't want to use IGNORABLE on what might be a special
 305   ;; var.
 306   (multiple-value-bind (forms decls) (parse-body body :doc-string-allowed nil)
 307     (let ((n-list (gensym "N-LIST"))
 308           (start (gensym "START")))
 309       `(block nil
 310          (let ((,n-list ,list))
 311            (tagbody
 312               ,start
 313               (unless (endp ,n-list)
 314                 (let ((,var (car ,n-list)))
 315                   ,@decls
 316                   (setq ,n-list (cdr ,n-list))
 317                   (tagbody ,@forms))
 318                 (go ,start))))
 319          ,(if result
 320               `(let ((,var nil))
 321                  ,var
 322                  ,result)
 323                nil)))))
 324 \f
 325 ;;;; conditions, handlers, restarts
 326
 327 ;;; KLUDGE: we PROCLAIM these special here so that we can use restart
 328 ;;; macros in the compiler before the DEFVARs are compiled.
 329 (sb!xc:proclaim
 330  '(special *handler-clusters* *restart-clusters* *condition-restarts*))
 331
 332 (defmacro-mundanely with-condition-restarts
 333     (condition-form restarts-form &body body)
 334   #!+sb-doc
 335   "WITH-CONDITION-RESTARTS Condition-Form Restarts-Form Form*
 336    Evaluates the Forms in a dynamic environment where the restarts in the list
 337    Restarts-Form are associated with the condition returned by Condition-Form.
 338    This allows FIND-RESTART, etc., to recognize restarts that are not related
 339    to the error currently being debugged. See also RESTART-CASE."
 340   (let ((n-cond (gensym)))
 341     `(let ((*condition-restarts*
 342             (cons (let ((,n-cond ,condition-form))
 343                     (cons ,n-cond
 344                           (append ,restarts-form
 345                                   (cdr (assoc ,n-cond *condition-restarts*)))))
 346                   *condition-restarts*)))
 347        ,@body)))
 348
 349 (defmacro-mundanely restart-bind (bindings &body forms)
 350   #!+sb-doc
 351   "Executes forms in a dynamic context where the given restart bindings are
 352    in effect. Users probably want to use RESTART-CASE. When clauses contain
 353    the same restart name, FIND-RESTART will find the first such clause."
 354   `(let ((*restart-clusters*
 355           (cons (list
 356                  ,@(mapcar (lambda (binding)
 357                              (unless (or (car binding)
 358                                          (member :report-function
 359                                                  binding
 360                                                  :test #'eq))
 361                                (warn "Unnamed restart does not have a ~
 362                                         report function: ~S"
 363                                      binding))
 364                              `(make-restart :name ',(car binding)
 365                                             :function ,(cadr binding)
 366                                             ,@(cddr binding)))
 367                            bindings))
 368                 *restart-clusters*)))
 369      ,@forms))
 370
 371 ;;; Wrap the RESTART-CASE expression in a WITH-CONDITION-RESTARTS if
 372 ;;; appropriate. Gross, but it's what the book seems to say...
 373 (defun munge-restart-case-expression (expression env)
 374   (let ((exp (sb!xc:macroexpand expression env)))
 375     (if (consp exp)
 376         (let* ((name (car exp))
 377                (args (if (eq name 'cerror) (cddr exp) (cdr exp))))
 378           (if (member name '(signal error cerror warn))
 379               (once-only ((n-cond `(coerce-to-condition
 380                                     ,(first args)
 381                                     (list ,@(rest args))
 382                                     ',(case name
 383                                         (warn 'simple-warning)
 384                                         (signal 'simple-condition)
 385                                         (t 'simple-error))
 386                                     ',name)))
 387                 `(with-condition-restarts
 388                      ,n-cond
 389                      (car *restart-clusters*)
 390                    ,(if (eq name 'cerror)
 391                         `(cerror ,(second exp) ,n-cond)
 392                         `(,name ,n-cond))))
 393               expression))
 394         expression)))
 395
 396 ;;; FIXME: I did a fair amount of rearrangement of this code in order to
 397 ;;; get WITH-KEYWORD-PAIRS to work cleanly. This code should be tested..
 398 (defmacro-mundanely restart-case (expression &body clauses &environment env)
 399   #!+sb-doc
 400   "(RESTART-CASE form
 401    {(case-name arg-list {keyword value}* body)}*)
 402    The form is evaluated in a dynamic context where the clauses have special
 403    meanings as points to which control may be transferred (see INVOKE-RESTART).
 404    When clauses contain the same case-name, FIND-RESTART will find the first
 405    such clause. If Expression is a call to SIGNAL, ERROR, CERROR or WARN (or
 406    macroexpands into such) then the signalled condition will be associated with
 407    the new restarts."
 408   (flet ((transform-keywords (&key report interactive test)
 409            (let ((result '()))
 410              (when report
 411                (setq result (list* (if (stringp report)
 412                                        `#'(lambda (stream)
 413                                             (write-string ,report stream))
 414                                        `#',report)
 415                                    :report-function
 416                                    result)))
 417              (when interactive
 418                (setq result (list* `#',interactive
 419                                    :interactive-function
 420                                    result)))
 421              (when test
 422                (setq result (list* `#',test :test-function result)))
 423              (nreverse result)))
 424          (parse-keyword-pairs (list keys)
 425            (do ((l list (cddr l))
 426                 (k '() (list* (cadr l) (car l) k)))
 427                ((or (null l) (not (member (car l) keys)))
 428                 (values (nreverse k) l)))))
 429     (let ((block-tag (gensym))
 430           (temp-var (gensym))
 431           (data
 432            (macrolet (;; KLUDGE: This started as an old DEFMACRO
 433                       ;; WITH-KEYWORD-PAIRS general utility, which was used
 434                       ;; only in this one place in the code. It was translated
 435                       ;; literally into this MACROLET in order to avoid some
 436                       ;; cross-compilation bootstrap problems. It would almost
 437                       ;; certainly be clearer, and it would certainly be more
 438                       ;; concise, to do a more idiomatic translation, merging
 439                       ;; this with the TRANSFORM-KEYWORDS logic above.
 440                       ;;   -- WHN 19990925
 441                       (with-keyword-pairs ((names expression) &body forms)
 442                         (let ((temp (member '&rest names)))
 443                           (unless (= (length temp) 2)
 444                             (error "&REST keyword is ~:[missing~;misplaced~]."
 445                                    temp))
 446                           (let* ((key-vars (ldiff names temp))
 447                                  (keywords (mapcar #'keywordicate key-vars))
 448                                  (key-var (gensym))
 449                                  (rest-var (cadr temp)))
 450                             `(multiple-value-bind (,key-var ,rest-var)
 451                                  (parse-keyword-pairs ,expression ',keywords)
 452                                (let ,(mapcar (lambda (var keyword)
 453                                                `(,var (getf ,key-var
 454                                                             ,keyword)))
 455                                              key-vars keywords)
 456                                  ,@forms))))))
 457              (mapcar (lambda (clause)
 458                        (with-keyword-pairs ((report interactive test
 459                                                     &rest forms)
 460                                             (cddr clause))
 461                          (list (car clause) ;name=0
 462                                (gensym) ;tag=1
 463                                (transform-keywords :report report ;keywords=2
 464                                                    :interactive interactive
 465                                                    :test test)
 466                                (cadr clause) ;bvl=3
 467                                forms))) ;body=4
 468                    clauses))))
 469       `(block ,block-tag
 470          (let ((,temp-var nil))
 471            (tagbody
 472             (restart-bind
 473                 ,(mapcar (lambda (datum)
 474                            (let ((name (nth 0 datum))
 475                                  (tag  (nth 1 datum))
 476                                  (keys (nth 2 datum)))
 477                              `(,name #'(lambda (&rest temp)
 478                                          (setq ,temp-var temp)
 479                                          (go ,tag))
 480                                      ,@keys)))
 481                          data)
 482               (return-from ,block-tag
 483                            ,(munge-restart-case-expression expression env)))
 484             ,@(mapcan (lambda (datum)
 485                         (let ((tag  (nth 1 datum))
 486                               (bvl  (nth 3 datum))
 487                               (body (nth 4 datum)))
 488                           (list tag
 489                                 `(return-from ,block-tag
 490                                    (apply (lambda ,bvl ,@body)
 491                                           ,temp-var)))))
 492                       data)))))))
 493
 494 (defmacro-mundanely with-simple-restart ((restart-name format-string
 495                                                        &rest format-arguments)
 496                                          &body forms)
 497   #!+sb-doc
 498   "(WITH-SIMPLE-RESTART (restart-name format-string format-arguments)
 499    body)
 500    If restart-name is not invoked, then all values returned by forms are
 501    returned. If control is transferred to this restart, it immediately
 502    returns the values NIL and T."
 503   `(restart-case
 504        ;; If there's just one body form, then don't use PROGN. This allows
 505        ;; RESTART-CASE to "see" calls to ERROR, etc.
 506        ,(if (= (length forms) 1) (car forms) `(progn ,@forms))
 507      (,restart-name ()
 508         :report (lambda (stream)
 509                   (format stream ,format-string ,@format-arguments))
 510       (values nil t))))
 511
 512 (defmacro-mundanely handler-bind (bindings &body forms)
 513   #!+sb-doc
 514   "(HANDLER-BIND ( {(type handler)}* )  body)
 515    Executes body in a dynamic context where the given handler bindings are
 516    in effect. Each handler must take the condition being signalled as an
 517    argument. The bindings are searched first to last in the event of a
 518    signalled condition."
 519   (let ((member-if (member-if (lambda (x)
 520                                 (not (proper-list-of-length-p x 2)))
 521                               bindings)))
 522     (when member-if
 523       (error "ill-formed handler binding: ~S" (first member-if))))
 524   `(let ((*handler-clusters*
 525           (cons (list ,@(mapcar (lambda (x) `(cons ',(car x) ,(cadr x)))
 526                                 bindings))
 527                 *handler-clusters*)))
 528      (multiple-value-prog1
 529          (progn
 530            ,@forms)
 531        ;; Wait for any float exceptions.
 532        #!+x86 (float-wait))))
 533
 534 (defmacro-mundanely handler-case (form &rest cases)
 535   "(HANDLER-CASE form
 536    { (type ([var]) body) }* )
 537    Execute FORM in a context with handlers established for the condition
 538    types. A peculiar property allows type to be :NO-ERROR. If such a clause
 539    occurs, and form returns normally, all its values are passed to this clause
 540    as if by MULTIPLE-VALUE-CALL.  The :NO-ERROR clause accepts more than one
 541    var specification."
 542   ;; FIXME: Replacing CADR, CDDDR and friends with DESTRUCTURING-BIND
 543   ;; and names for the subexpressions would make it easier to
 544   ;; understand the code below.
 545   (let ((no-error-clause (assoc ':no-error cases)))
 546     (if no-error-clause
 547         (let ((normal-return (make-symbol "normal-return"))
 548               (error-return  (make-symbol "error-return")))
 549           `(block ,error-return
 550              (multiple-value-call (lambda ,@(cdr no-error-clause))
 551                (block ,normal-return
 552                  (return-from ,error-return
 553                    (handler-case (return-from ,normal-return ,form)
 554                      ,@(remove no-error-clause cases)))))))
 555         (let ((tag (gensym))
 556               (var (gensym))
 557               (annotated-cases (mapcar (lambda (case) (cons (gensym) case))
 558                                        cases)))
 559           `(block ,tag
 560              (let ((,var nil))
 561                (declare (ignorable ,var))
 562                (tagbody
 563                 (handler-bind
 564                     ,(mapcar (lambda (annotated-case)
 565                                (list (cadr annotated-case)
 566                                      `(lambda (temp)
 567                                         ,(if (caddr annotated-case)
 568                                              `(setq ,var temp)
 569                                              '(declare (ignore temp)))
 570                                         (go ,(car annotated-case)))))
 571                              annotated-cases)
 572                   (return-from ,tag
 573                     #!-x86 ,form
 574                     #!+x86 (multiple-value-prog1 ,form
 575                              ;; Need to catch FP errors here!
 576                              (float-wait))))
 577                 ,@(mapcan
 578                    (lambda (annotated-case)
 579                      (list (car annotated-case)
 580                            (let ((body (cdddr annotated-case)))
 581                              `(return-from
 582                                   ,tag
 583                                 ,(cond ((caddr annotated-case)
 584                                         `(let ((,(caaddr annotated-case)
 585                                                 ,var))
 586                                            ,@body))
 587                                        (t
 588                                         `(locally ,@body)))))))
 589                    annotated-cases))))))))
 590 \f
 591 ;;;; miscellaneous
 592
 593 (defmacro-mundanely return (&optional (value nil))
 594   `(return-from nil ,value))
 595
 596 (defmacro-mundanely psetq (&rest pairs)
 597   #!+sb-doc
 598   "PSETQ {var value}*
 599    Set the variables to the values, like SETQ, except that assignments
 600    happen in parallel, i.e. no assignments take place until all the
 601    forms have been evaluated."
 602   ;; Given the possibility of symbol-macros, we delegate to PSETF
 603   ;; which knows how to deal with them, after checking that syntax is
 604   ;; compatible with PSETQ.
 605   (do ((pair pairs (cddr pair)))
 606       ((endp pair) `(psetf ,@pairs))
 607     (unless (symbolp (car pair))
 608       (error 'simple-program-error
 609              :format-control "variable ~S in PSETQ is not a SYMBOL"
 610              :format-arguments (list (car pair))))))
 611
 612 (defmacro-mundanely lambda (&whole whole args &body body)
 613   (declare (ignore args body))
 614   `#',whole)
 615
 616 (defmacro-mundanely named-lambda (&whole whole name args &body body)
 617   (declare (ignore name args body))
 618   `#',whole)
 619
 620 (defmacro-mundanely lambda-with-lexenv (&whole whole
 621                                         declarations macros symbol-macros
 622                                         &body body)
 623   (declare (ignore declarations macros symbol-macros body))
 624   `#',whole)
 625
 626 ;;; this eliminates a whole bundle of unknown function STYLE-WARNINGs
 627 ;;; when cross-compiling.  It's not critical for behaviour, but is
 628 ;;; aesthetically pleasing, except inasmuch as there's this list of
 629 ;;; magic functions here.  -- CSR, 2003-04-01
 630 #+sb-xc-host
 631 (sb!xc:proclaim '(ftype (function * *)
 632                         ;; functions appearing in fundamental defining
 633                         ;; macro expansions:
 634                         %compiler-deftype
 635                         %defun
 636                         %defsetf
 637                         sb!c:%compiler-defun
 638                         sb!c::%define-symbol-macro
 639                         sb!c::%defconstant
 640                         sb!c::%define-compiler-macro
 641                         sb!c::%defmacro
 642                         sb!kernel::%compiler-defstruct
 643                         sb!kernel::%compiler-define-condition
 644                         sb!kernel::%defstruct
 645                         sb!kernel::%define-condition
 646                         ;; miscellaneous functions commonly appearing
 647                         ;; as a result of macro expansions or compiler
 648                         ;; transformations:
 649                         sb!int:find-undeleted-package-or-lose ; IN-PACKAGE
 650                         sb!kernel::arg-count-error ; PARSE-DEFMACRO
 651                         ))