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 ,@(mapcar #'list vars)
  44                                          &rest ,ignore)
  45                                   (declare (ignore ,ignore))
  46                                   ,@body)
  47                               ,value-form)))
  48     (error "Vars is not a list of symbols: ~S" vars)))
  49
  50 (defmacro-mundanely multiple-value-setq (vars value-form)
  51   (unless (list-of-symbols-p vars)
  52     (error "Vars is not a list of symbols: ~S" vars))
  53   ;; MULTIPLE-VALUE-SETQ is required to always return just the primary
  54   ;; value of the value-from, even if there are no vars. (SETF VALUES)
  55   ;; in turn is required to return as many values as there are
  56   ;; value-places, hence this:
  57   (if vars
  58       `(values (setf (values ,@vars) ,value-form))
  59       `(values ,value-form)))
  60
  61 (defmacro-mundanely multiple-value-list (value-form)
  62   `(multiple-value-call #'list ,value-form))
  63 \f
  64 ;;;; various conditional constructs
  65
  66 ;;; COND defined in terms of IF
  67 (defmacro-mundanely cond (&rest clauses)
  68   (if (endp clauses)
  69       nil
  70       (let ((clause (first clauses)))
  71         (if (atom clause)
  72             (error "COND clause is not a list: ~S" clause)
  73             (let ((test (first clause))
  74                   (forms (rest clause)))
  75               (if (endp forms)
  76                   (let ((n-result (gensym)))
  77                     `(let ((,n-result ,test))
  78                        (if ,n-result
  79                            ,n-result
  80                            (cond ,@(rest clauses)))))
  81                   `(if ,test
  82                        (progn ,@forms)
  83                        (cond ,@(rest clauses)))))))))
  84
  85 ;;; other things defined in terms of COND
  86 (defmacro-mundanely when (test &body forms)
  87   #!+sb-doc
  88   "If the first argument is true, the rest of the forms are
  89   evaluated as a PROGN."
  90   `(cond (,test nil ,@forms)))
  91 (defmacro-mundanely unless (test &body forms)
  92   #!+sb-doc
  93   "If the first argument is not true, the rest of the forms are
  94   evaluated as a PROGN."
  95   `(cond ((not ,test) nil ,@forms)))
  96 (defmacro-mundanely and (&rest forms)
  97   (cond ((endp forms) t)
  98         ((endp (rest forms)) (first forms))
  99         (t
 100          `(if ,(first forms)
 101               (and ,@(rest forms))
 102               nil))))
 103 (defmacro-mundanely or (&rest forms)
 104   (cond ((endp forms) nil)
 105         ((endp (rest forms)) (first forms))
 106         (t
 107          (let ((n-result (gensym)))
 108            `(let ((,n-result ,(first forms)))
 109               (if ,n-result
 110                   ,n-result
 111                   (or ,@(rest forms))))))))
 112 \f
 113 ;;;; various sequencing constructs
 114
 115 (flet ((prog-expansion-from-let (varlist body-decls let)
 116          (multiple-value-bind (body decls)
 117              (parse-body body-decls :doc-string-allowed nil)
 118            `(block nil
 119               (,let ,varlist
 120                 ,@decls
 121                 (tagbody ,@body))))))
 122   (defmacro-mundanely prog (varlist &body body-decls)
 123     (prog-expansion-from-let varlist body-decls 'let))
 124   (defmacro-mundanely prog* (varlist &body body-decls)
 125     (prog-expansion-from-let varlist body-decls 'let*)))
 126
 127 (defmacro-mundanely prog1 (result &body body)
 128   (let ((n-result (gensym)))
 129     `(let ((,n-result ,result))
 130        ,@body
 131        ,n-result)))
 132
 133 (defmacro-mundanely prog2 (form1 result &body body)
 134   `(prog1 (progn ,form1 ,result) ,@body))
 135 \f
 136 ;;;; DEFUN
 137
 138 ;;; Should we save the inline expansion of the function named NAME?
 139 (defun inline-fun-name-p (name)
 140   (or
 141    ;; the normal reason for saving the inline expansion
 142    (info :function :inlinep name)
 143    ;; another reason for saving the inline expansion: If the
 144    ;; ANSI-recommended idiom
 145    ;;   (DECLAIM (INLINE FOO))
 146    ;;   (DEFUN FOO ..)
 147    ;;   (DECLAIM (NOTINLINE FOO))
 148    ;; has been used, and then we later do another
 149    ;;   (DEFUN FOO ..)
 150    ;; without a preceding
 151    ;;   (DECLAIM (INLINE FOO))
 152    ;; what should we do with the old inline expansion when we see the
 153    ;; new DEFUN? Overwriting it with the new definition seems like
 154    ;; the only unsurprising choice.
 155    (info :function :inline-expansion-designator name)))
 156
 157 (defmacro-mundanely defun (&environment env name args &body body)
 158   "Define a function at top level."
 159   #+sb-xc-host
 160   (unless (symbol-package (fun-name-block-name name))
 161     (warn "DEFUN of uninterned function name ~S (tricky for GENESIS)" name))
 162   (multiple-value-bind (forms decls doc) (parse-body body)
 163     (let* (;; stuff shared between LAMBDA and INLINE-LAMBDA and NAMED-LAMBDA
 164            (lambda-guts `(,args
 165                           ,@decls
 166                           (block ,(fun-name-block-name name)
 167                             ,@forms)))
 168            (lambda `(lambda ,@lambda-guts))
 169            #-sb-xc-host
 170            (named-lambda `(named-lambda ,name ,@lambda-guts))
 171            (inline-lambda
 172             (when (inline-fun-name-p name)
 173               ;; we want to attempt to inline, so complain if we can't
 174               (or (sb!c:maybe-inline-syntactic-closure lambda env)
 175                   (progn
 176                     (#+sb-xc-host warn
 177                      #-sb-xc-host sb!c:maybe-compiler-notify
 178                      "lexical environment too hairy, can't inline DEFUN ~S"
 179                      name)
 180                     nil)))))
 181       `(progn
 182          ;; In cross-compilation of toplevel DEFUNs, we arrange for
 183          ;; the LAMBDA to be statically linked by GENESIS.
 184          ;;
 185          ;; It may seem strangely inconsistent not to use NAMED-LAMBDA
 186          ;; here instead of LAMBDA. The reason is historical:
 187          ;; COLD-FSET was written before NAMED-LAMBDA, and has special
 188          ;; logic of its own to notify the compiler about NAME.
 189          #+sb-xc-host
 190          (cold-fset ,name ,lambda)
 191
 192          (eval-when (:compile-toplevel)
 193            (sb!c:%compiler-defun ',name ',inline-lambda t))
 194          (eval-when (:load-toplevel :execute)
 195            (%defun ',name
 196                    ;; In normal compilation (not for cold load) this is
 197                    ;; where the compiled LAMBDA first appears. In
 198                    ;; cross-compilation, we manipulate the
 199                    ;; previously-statically-linked LAMBDA here.
 200                    #-sb-xc-host ,named-lambda
 201                    #+sb-xc-host (fdefinition ',name)
 202                    ,doc
 203                    ',inline-lambda))))))
 204
 205 #-sb-xc-host
 206 (defun %defun (name def doc inline-lambda)
 207   (declare (type function def))
 208   (declare (type (or null simple-string) doc))
 209   (aver (legal-fun-name-p name)) ; should've been checked by DEFMACRO DEFUN
 210   (sb!c:%compiler-defun name inline-lambda nil)
 211   (when (fboundp name)
 212     (/show0 "redefining NAME in %DEFUN")
 213     (style-warn "redefining ~S in DEFUN" name))
 214   (setf (sb!xc:fdefinition name) def)
 215
 216   ;; FIXME: I want to do this here (and fix bug 137), but until the
 217   ;; breathtaking CMU CL function name architecture is converted into
 218   ;; something sane, (1) doing so doesn't really fix the bug, and
 219   ;; (2) doing probably isn't even really safe.
 220   #+nil (setf (%fun-name def) name)
 221
 222   (when doc
 223     (setf (fdocumentation name 'function) doc))
 224   name)
 225 \f
 226 ;;;; DEFVAR and DEFPARAMETER
 227
 228 (defmacro-mundanely defvar (var &optional (val nil valp) (doc nil docp))
 229   #!+sb-doc
 230   "Define a global variable at top level. Declare the variable
 231   SPECIAL and, optionally, initialize it. If the variable already has a
 232   value, the old value is not clobbered. The third argument is an optional
 233   documentation string for the variable."
 234   `(progn
 235      (eval-when (:compile-toplevel)
 236        (%compiler-defvar ',var))
 237      (eval-when (:load-toplevel :execute)
 238        (%defvar ',var (unless (boundp ',var) ,val) ',valp ,doc ',docp))))
 239
 240 (defmacro-mundanely defparameter (var val &optional (doc nil docp))
 241   #!+sb-doc
 242   "Define a parameter that is not normally changed by the program,
 243   but that may be changed without causing an error. Declare the
 244   variable special and sets its value to VAL, overwriting any
 245   previous value. The third argument is an optional documentation
 246   string for the parameter."
 247   `(progn
 248      (eval-when (:compile-toplevel)
 249        (%compiler-defvar ',var))
 250      (eval-when (:load-toplevel :execute)
 251        (%defparameter ',var ,val ,doc ',docp))))
 252
 253 (defun %compiler-defvar (var)
 254   (sb!xc:proclaim `(special ,var)))
 255
 256 #-sb-xc-host
 257 (defun %defvar (var val valp doc docp)
 258   (%compiler-defvar var)
 259   (when valp
 260     (unless (boundp var)
 261       (set var val)))
 262   (when docp
 263     (setf (fdocumentation var 'variable) doc))
 264   var)
 265
 266 #-sb-xc-host
 267 (defun %defparameter (var val doc docp)
 268   (%compiler-defvar var)
 269   (set var val)
 270   (when docp
 271     (setf (fdocumentation var 'variable) doc))
 272   var)
 273 \f
 274 ;;;; iteration constructs
 275
 276 ;;; (These macros are defined in terms of a function FROB-DO-BODY which
 277 ;;; is also used by SB!INT:DO-ANONYMOUS. Since these macros should not
 278 ;;; be loaded on the cross-compilation host, but SB!INT:DO-ANONYMOUS
 279 ;;; and FROB-DO-BODY should be, these macros can't conveniently be in
 280 ;;; the same file as FROB-DO-BODY.)
 281 (defmacro-mundanely do (varlist endlist &body body)
 282   #!+sb-doc
 283   "DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
 284   Iteration construct. Each Var is initialized in parallel to the value of the
 285   specified Init form. On subsequent iterations, the Vars are assigned the
 286   value of the Step form (if any) in parallel. The Test is evaluated before
 287   each evaluation of the body Forms. When the Test is true, the Exit-Forms
 288   are evaluated as a PROGN, with the result being the value of the DO. A block
 289   named NIL is established around the entire expansion, allowing RETURN to be
 290   used as an alternate exit mechanism."
 291   (frob-do-body varlist endlist body 'let 'psetq 'do nil))
 292 (defmacro-mundanely do* (varlist endlist &body body)
 293   #!+sb-doc
 294   "DO* ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
 295   Iteration construct. Each Var is initialized sequentially (like LET*) to the
 296   value of the specified Init form. On subsequent iterations, the Vars are
 297   sequentially assigned the value of the Step form (if any). The Test is
 298   evaluated before each evaluation of the body Forms. When the Test is true,
 299   the Exit-Forms are evaluated as a PROGN, with the result being the value
 300   of the DO. A block named NIL is established around the entire expansion,
 301   allowing RETURN to be used as an laternate exit mechanism."
 302   (frob-do-body varlist endlist body 'let* 'setq 'do* nil))
 303
 304 ;;; DOTIMES and DOLIST could be defined more concisely using
 305 ;;; destructuring macro lambda lists or DESTRUCTURING-BIND, but then
 306 ;;; it'd be tricky to use them before those things were defined.
 307 ;;; They're used enough times before destructuring mechanisms are
 308 ;;; defined that it looks as though it's worth just implementing them
 309 ;;; ASAP, at the cost of being unable to use the standard
 310 ;;; destructuring mechanisms.
 311 (defmacro-mundanely dotimes ((var count &optional (result nil)) &body body)
 312   (cond ((numberp count)
 313          `(do ((,var 0 (1+ ,var)))
 314               ((>= ,var ,count) ,result)
 315             (declare (type unsigned-byte ,var))
 316             ,@body))
 317         (t (let ((v1 (gensym)))
 318              `(do ((,var 0 (1+ ,var)) (,v1 ,count))
 319                   ((>= ,var ,v1) ,result)
 320                 (declare (type unsigned-byte ,var))
 321                 ,@body)))))
 322
 323 (defun filter-dolist-declarations (decls)
 324   (mapcar (lambda (decl)
 325             `(declare ,@(remove-if
 326                          (lambda (clause)
 327                            (and (consp clause)
 328                                 (or (eq (car clause) 'type)
 329                                     (eq (car clause) 'ignore))))
 330                          (cdr decl))))
 331           decls))
 332
 333 (defmacro-mundanely dolist ((var list &optional (result nil)) &body body)
 334   ;; We repeatedly bind the var instead of setting it so that we never
 335   ;; have to give the var an arbitrary value such as NIL (which might
 336   ;; conflict with a declaration). If there is a result form, we
 337   ;; introduce a gratuitous binding of the variable to NIL without the
 338   ;; declarations, then evaluate the result form in that
 339   ;; environment. We spuriously reference the gratuitous variable,
 340   ;; since we don't want to use IGNORABLE on what might be a special
 341   ;; var.
 342   (multiple-value-bind (forms decls) (parse-body body :doc-string-allowed nil)
 343     (let ((n-list (gensym "N-LIST"))
 344           (start (gensym "START")))
 345       `(block nil
 346          (let ((,n-list ,list))
 347            (tagbody
 348               ,start
 349               (unless (endp ,n-list)
 350                 (let ((,var (car ,n-list)))
 351                   ,@decls
 352                   (setq ,n-list (cdr ,n-list))
 353                   (tagbody ,@forms))
 354                 (go ,start))))
 355          ,(if result
 356               `(let ((,var nil))
 357                  ;; Filter out TYPE declarations (VAR gets bound to NIL,
 358                  ;; and might have a conflicting type declaration) and
 359                  ;; IGNORE (VAR might be ignored in the loop body, but
 360                  ;; it's used in the result form).
 361                  ,@(filter-dolist-declarations decls)
 362                  ,var
 363                  ,result)
 364                nil)))))
 365 \f
 366 ;;;; conditions, handlers, restarts
 367
 368 ;;; KLUDGE: we PROCLAIM these special here so that we can use restart
 369 ;;; macros in the compiler before the DEFVARs are compiled.
 370 (sb!xc:proclaim
 371  '(special *handler-clusters* *restart-clusters* *condition-restarts*))
 372
 373 (defmacro-mundanely with-condition-restarts
 374     (condition-form restarts-form &body body)
 375   #!+sb-doc
 376   "Evaluates the BODY in a dynamic environment where the restarts in the list
 377    RESTARTS-FORM are associated with the condition returned by CONDITION-FORM.
 378    This allows FIND-RESTART, etc., to recognize restarts that are not related
 379    to the error currently being debugged. See also RESTART-CASE."
 380   (let ((n-cond (gensym)))
 381     `(let ((*condition-restarts*
 382             (cons (let ((,n-cond ,condition-form))
 383                     (cons ,n-cond
 384                           (append ,restarts-form
 385                                   (cdr (assoc ,n-cond *condition-restarts*)))))
 386                   *condition-restarts*)))
 387        ,@body)))
 388
 389 (defmacro-mundanely restart-bind (bindings &body forms)
 390   #!+sb-doc
 391   "Executes forms in a dynamic context where the given restart bindings are
 392    in effect. Users probably want to use RESTART-CASE. When clauses contain
 393    the same restart name, FIND-RESTART will find the first such clause."
 394   `(let ((*restart-clusters*
 395           (cons (list
 396                  ,@(mapcar (lambda (binding)
 397                              (unless (or (car binding)
 398                                          (member :report-function
 399                                                  binding
 400                                                  :test #'eq))
 401                                (warn "Unnamed restart does not have a ~
 402                                       report function: ~S"
 403                                      binding))
 404                              `(make-restart :name ',(car binding)
 405                                             :function ,(cadr binding)
 406                                             ,@(cddr binding)))
 407                            bindings))
 408                 *restart-clusters*)))
 409      ,@forms))
 410
 411 ;;; Wrap the RESTART-CASE expression in a WITH-CONDITION-RESTARTS if
 412 ;;; appropriate. Gross, but it's what the book seems to say...
 413 (defun munge-restart-case-expression (expression env)
 414   (let ((exp (sb!xc:macroexpand expression env)))
 415     (if (consp exp)
 416         (let* ((name (car exp))
 417                (args (if (eq name 'cerror) (cddr exp) (cdr exp))))
 418           (if (member name '(signal error cerror warn))
 419               (once-only ((n-cond `(coerce-to-condition
 420                                     ,(first args)
 421                                     (list ,@(rest args))
 422                                     ',(case name
 423                                         (warn 'simple-warning)
 424                                         (signal 'simple-condition)
 425                                         (t 'simple-error))
 426                                     ',name)))
 427                 `(with-condition-restarts
 428                      ,n-cond
 429                      (car *restart-clusters*)
 430                    ,(if (eq name 'cerror)
 431                         `(cerror ,(second exp) ,n-cond)
 432                         `(,name ,n-cond))))
 433               expression))
 434         expression)))
 435
 436 ;;; FIXME: I did a fair amount of rearrangement of this code in order to
 437 ;;; get WITH-KEYWORD-PAIRS to work cleanly. This code should be tested..
 438 (defmacro-mundanely restart-case (expression &body clauses &environment env)
 439   #!+sb-doc
 440   "(RESTART-CASE form
 441    {(case-name arg-list {keyword value}* body)}*)
 442    The form is evaluated in a dynamic context where the clauses have special
 443    meanings as points to which control may be transferred (see INVOKE-RESTART).
 444    When clauses contain the same case-name, FIND-RESTART will find the first
 445    such clause. If Expression is a call to SIGNAL, ERROR, CERROR or WARN (or
 446    macroexpands into such) then the signalled condition will be associated with
 447    the new restarts."
 448   (flet ((transform-keywords (&key report interactive test)
 449            (let ((result '()))
 450              (when report
 451                (setq result (list* (if (stringp report)
 452                                        `#'(lambda (stream)
 453                                             (write-string ,report stream))
 454                                        `#',report)
 455                                    :report-function
 456                                    result)))
 457              (when interactive
 458                (setq result (list* `#',interactive
 459                                    :interactive-function
 460                                    result)))
 461              (when test
 462                (setq result (list* `#',test :test-function result)))
 463              (nreverse result)))
 464          (parse-keyword-pairs (list keys)
 465            (do ((l list (cddr l))
 466                 (k '() (list* (cadr l) (car l) k)))
 467                ((or (null l) (not (member (car l) keys)))
 468                 (values (nreverse k) l)))))
 469     (let ((block-tag (gensym))
 470           (temp-var (gensym))
 471           (data
 472            (macrolet (;; KLUDGE: This started as an old DEFMACRO
 473                       ;; WITH-KEYWORD-PAIRS general utility, which was used
 474                       ;; only in this one place in the code. It was translated
 475                       ;; literally into this MACROLET in order to avoid some
 476                       ;; cross-compilation bootstrap problems. It would almost
 477                       ;; certainly be clearer, and it would certainly be more
 478                       ;; concise, to do a more idiomatic translation, merging
 479                       ;; this with the TRANSFORM-KEYWORDS logic above.
 480                       ;;   -- WHN 19990925
 481                       (with-keyword-pairs ((names expression) &body forms)
 482                         (let ((temp (member '&rest names)))
 483                           (unless (= (length temp) 2)
 484                             (error "&REST keyword is ~:[missing~;misplaced~]."
 485                                    temp))
 486                           (let* ((key-vars (ldiff names temp))
 487                                  (keywords (mapcar #'keywordicate key-vars))
 488                                  (key-var (gensym))
 489                                  (rest-var (cadr temp)))
 490                             `(multiple-value-bind (,key-var ,rest-var)
 491                                  (parse-keyword-pairs ,expression ',keywords)
 492                                (let ,(mapcar (lambda (var keyword)
 493                                                `(,var (getf ,key-var
 494                                                             ,keyword)))
 495                                              key-vars keywords)
 496                                  ,@forms))))))
 497              (mapcar (lambda (clause)
 498                        (with-keyword-pairs ((report interactive test
 499                                                     &rest forms)
 500                                             (cddr clause))
 501                          (list (car clause) ;name=0
 502                                (gensym) ;tag=1
 503                                (transform-keywords :report report ;keywords=2
 504                                                    :interactive interactive
 505                                                    :test test)
 506                                (cadr clause) ;bvl=3
 507                                forms))) ;body=4
 508                    clauses))))
 509       `(block ,block-tag
 510          (let ((,temp-var nil))
 511            (tagbody
 512             (restart-bind
 513                 ,(mapcar (lambda (datum)
 514                            (let ((name (nth 0 datum))
 515                                  (tag  (nth 1 datum))
 516                                  (keys (nth 2 datum)))
 517                              `(,name #'(lambda (&rest temp)
 518                                          (setq ,temp-var temp)
 519                                          (go ,tag))
 520                                      ,@keys)))
 521                          data)
 522               (return-from ,block-tag
 523                            ,(munge-restart-case-expression expression env)))
 524             ,@(mapcan (lambda (datum)
 525                         (let ((tag  (nth 1 datum))
 526                               (bvl  (nth 3 datum))
 527                               (body (nth 4 datum)))
 528                           (list tag
 529                                 `(return-from ,block-tag
 530                                    (apply (lambda ,bvl ,@body)
 531                                           ,temp-var)))))
 532                       data)))))))
 533
 534 (defmacro-mundanely with-simple-restart ((restart-name format-string
 535                                                        &rest format-arguments)
 536                                          &body forms)
 537   #!+sb-doc
 538   "(WITH-SIMPLE-RESTART (restart-name format-string format-arguments)
 539    body)
 540    If restart-name is not invoked, then all values returned by forms are
 541    returned. If control is transferred to this restart, it immediately
 542    returns the values NIL and T."
 543   `(restart-case
 544        ;; If there's just one body form, then don't use PROGN. This allows
 545        ;; RESTART-CASE to "see" calls to ERROR, etc.
 546        ,(if (= (length forms) 1) (car forms) `(progn ,@forms))
 547      (,restart-name ()
 548         :report (lambda (stream)
 549                   (format stream ,format-string ,@format-arguments))
 550       (values nil t))))
 551
 552 (defmacro-mundanely handler-bind (bindings &body forms)
 553   #!+sb-doc
 554   "(HANDLER-BIND ( {(type handler)}* )  body)
 555    Executes body in a dynamic context where the given handler bindings are
 556    in effect. Each handler must take the condition being signalled as an
 557    argument. The bindings are searched first to last in the event of a
 558    signalled condition."
 559   (let ((member-if (member-if (lambda (x)
 560                                 (not (proper-list-of-length-p x 2)))
 561                               bindings)))
 562     (when member-if
 563       (error "ill-formed handler binding: ~S" (first member-if))))
 564   `(let ((*handler-clusters*
 565           (cons (list ,@(mapcar (lambda (x) `(cons ',(car x) ,(cadr x)))
 566                                 bindings))
 567                 *handler-clusters*)))
 568      (multiple-value-prog1
 569          (progn
 570            ,@forms)
 571        ;; Wait for any float exceptions.
 572        #!+x86 (float-wait))))
 573
 574 (defmacro-mundanely handler-case (form &rest cases)
 575   "(HANDLER-CASE form
 576    { (type ([var]) body) }* )
 577    Execute FORM in a context with handlers established for the condition
 578    types. A peculiar property allows type to be :NO-ERROR. If such a clause
 579    occurs, and form returns normally, all its values are passed to this clause
 580    as if by MULTIPLE-VALUE-CALL.  The :NO-ERROR clause accepts more than one
 581    var specification."
 582   ;; FIXME: Replacing CADR, CDDDR and friends with DESTRUCTURING-BIND
 583   ;; and names for the subexpressions would make it easier to
 584   ;; understand the code below.
 585   (let ((no-error-clause (assoc ':no-error cases)))
 586     (if no-error-clause
 587         (let ((normal-return (make-symbol "normal-return"))
 588               (error-return  (make-symbol "error-return")))
 589           `(block ,error-return
 590              (multiple-value-call (lambda ,@(cdr no-error-clause))
 591                (block ,normal-return
 592                  (return-from ,error-return
 593                    (handler-case (return-from ,normal-return ,form)
 594                      ,@(remove no-error-clause cases)))))))
 595         (let ((tag (gensym))
 596               (var (gensym))
 597               (annotated-cases (mapcar (lambda (case) (cons (gensym) case))
 598                                        cases)))
 599           `(block ,tag
 600              (let ((,var nil))
 601                (declare (ignorable ,var))
 602                (tagbody
 603                 (handler-bind
 604                     ,(mapcar (lambda (annotated-case)
 605                                (list (cadr annotated-case)
 606                                      `(lambda (temp)
 607                                         ,(if (caddr annotated-case)
 608                                              `(setq ,var temp)
 609                                              '(declare (ignore temp)))
 610                                         (go ,(car annotated-case)))))
 611                              annotated-cases)
 612                   (return-from ,tag
 613                     #!-x86 ,form
 614                     #!+x86 (multiple-value-prog1 ,form
 615                              ;; Need to catch FP errors here!
 616                              (float-wait))))
 617                 ,@(mapcan
 618                    (lambda (annotated-case)
 619                      (list (car annotated-case)
 620                            (let ((body (cdddr annotated-case)))
 621                              `(return-from
 622                                   ,tag
 623                                 ,(cond ((caddr annotated-case)
 624                                         `(let ((,(caaddr annotated-case)
 625                                                 ,var))
 626                                            ,@body))
 627                                        (t
 628                                         `(locally ,@body)))))))
 629                    annotated-cases))))))))
 630 \f
 631 ;;;; miscellaneous
 632
 633 (defmacro-mundanely return (&optional (value nil))
 634   `(return-from nil ,value))
 635
 636 (defmacro-mundanely psetq (&rest pairs)
 637   #!+sb-doc
 638   "PSETQ {var value}*
 639    Set the variables to the values, like SETQ, except that assignments
 640    happen in parallel, i.e. no assignments take place until all the
 641    forms have been evaluated."
 642   ;; Given the possibility of symbol-macros, we delegate to PSETF
 643   ;; which knows how to deal with them, after checking that syntax is
 644   ;; compatible with PSETQ.
 645   (do ((pair pairs (cddr pair)))
 646       ((endp pair) `(psetf ,@pairs))
 647     (unless (symbolp (car pair))
 648       (error 'simple-program-error
 649              :format-control "variable ~S in PSETQ is not a SYMBOL"
 650              :format-arguments (list (car pair))))))
 651
 652 (defmacro-mundanely lambda (&whole whole args &body body)
 653   (declare (ignore args body))
 654   `#',whole)
 655
 656 (defmacro-mundanely named-lambda (&whole whole name args &body body)
 657   (declare (ignore name args body))
 658   `#',whole)
 659
 660 (defmacro-mundanely lambda-with-lexenv (&whole whole
 661                                         declarations macros symbol-macros
 662                                         &body body)
 663   (declare (ignore declarations macros symbol-macros body))
 664   `#',whole)
 665
 666 ;;; this eliminates a whole bundle of unknown function STYLE-WARNINGs
 667 ;;; when cross-compiling.  It's not critical for behaviour, but is
 668 ;;; aesthetically pleasing, except inasmuch as there's this list of
 669 ;;; magic functions here.  -- CSR, 2003-04-01
 670 #+sb-xc-host
 671 (sb!xc:proclaim '(ftype (function * *)
 672                         ;; functions appearing in fundamental defining
 673                         ;; macro expansions:
 674                         %compiler-deftype
 675                         %compiler-defvar
 676                         %defun
 677                         %defsetf
 678                         %defparameter
 679                         %defvar
 680                         sb!c:%compiler-defun
 681                         sb!c::%define-symbol-macro
 682                         sb!c::%defconstant
 683                         sb!c::%define-compiler-macro
 684                         sb!c::%defmacro
 685                         sb!kernel::%compiler-defstruct
 686                         sb!kernel::%compiler-define-condition
 687                         sb!kernel::%defstruct
 688                         sb!kernel::%define-condition
 689                         ;; miscellaneous functions commonly appearing
 690                         ;; as a result of macro expansions or compiler
 691                         ;; transformations:
 692                         sb!int:find-undeleted-package-or-lose ; IN-PACKAGE
 693                         sb!kernel::arg-count-error ; PARSE-DEFMACRO
 694                         ))