src/pcl/boot.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3
   4 ;;;; This software is derived from software originally released by Xerox
   5 ;;;; Corporation. Copyright and release statements follow. Later modifications
   6 ;;;; to the software are in the public domain and are provided with
   7 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
   8 ;;;; information.
   9
  10 ;;;; copyright information from original PCL sources:
  11 ;;;;
  12 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
  13 ;;;; All rights reserved.
  14 ;;;;
  15 ;;;; Use and copying of this software and preparation of derivative works based
  16 ;;;; upon this software are permitted. Any distribution of this software or
  17 ;;;; derivative works must comply with all applicable United States export
  18 ;;;; control laws.
  19 ;;;;
  20 ;;;; This software is made available AS IS, and Xerox Corporation makes no
  21 ;;;; warranty about the software, its performance or its conformity to any
  22 ;;;; specification.
  23
  24 (in-package "SB-PCL")
  25 \f
  26 #|
  27
  28 The CommonLoops evaluator is meta-circular.
  29
  30 Most of the code in PCL is methods on generic functions, including
  31 most of the code that actually implements generic functions and method
  32 lookup.
  33
  34 So, we have a classic bootstrapping problem. The solution to this is
  35 to first get a cheap implementation of generic functions running,
  36 these are called early generic functions. These early generic
  37 functions and the corresponding early methods and early method lookup
  38 are used to get enough of the system running that it is possible to
  39 create real generic functions and methods and implement real method
  40 lookup. At that point (done in the file FIXUP) the function
  41 !FIX-EARLY-GENERIC-FUNCTIONS is called to convert all the early generic
  42 functions to real generic functions.
  43
  44 The cheap generic functions are built using the same
  45 FUNCALLABLE-INSTANCE objects that real generic functions are made out of.
  46 This means that as PCL is being bootstrapped, the cheap generic
  47 function objects which are being created are the same objects which
  48 will later be real generic functions. This is good because:
  49   - we don't cons garbage structure, and
  50   - we can keep pointers to the cheap generic function objects
  51     during booting because those pointers will still point to
  52     the right object after the generic functions are all fixed up.
  53
  54 This file defines the DEFMETHOD macro and the mechanism used to expand
  55 it. This includes the mechanism for processing the body of a method.
  56 DEFMETHOD basically expands into a call to LOAD-DEFMETHOD, which
  57 basically calls ADD-METHOD to add the method to the generic function.
  58 These expansions can be loaded either during bootstrapping or when PCL
  59 is fully up and running.
  60
  61 An important effect of this arrangement is it means we can compile
  62 files with DEFMETHOD forms in them in a completely running PCL, but
  63 then load those files back in during bootstrapping. This makes
  64 development easier. It also means there is only one set of code for
  65 processing DEFMETHOD. Bootstrapping works by being sure to have
  66 LOAD-METHOD be careful to call only primitives which work during
  67 bootstrapping.
  68
  69 |#
  70
  71 ;;; FIXME: As of sbcl-0.6.9.10, PCL still uses this nonstandard type
  72 ;;; of declaration internally. It would be good to figure out how to
  73 ;;; get rid of it, or failing that, (1) document why it's needed and
  74 ;;; (2) use a private symbol with a forbidding name which suggests
  75 ;;; it's not to be messed with by the user (e.g. SB-PCL:%CLASS)
  76 ;;; instead of the too-inviting CLASS. (I tried just deleting the
  77 ;;; declarations in MAKE-METHOD-LAMBDA-INTERNAL ca. sbcl-0.6.9.10, but
  78 ;;; then things break.)
  79 (declaim (declaration class))
  80
  81 ;;; FIXME: SB-KERNEL::PCL-CHECK-WRAPPER-VALIDITY-HOOK shouldn't be a
  82 ;;; separate function. Instead, we should define a simple placeholder
  83 ;;; version of SB-PCL:CHECK-WRAPPER-VALIDITY where
  84 ;;; SB-KERNEL::PCL-CHECK-WRAPPER-VALIDITY is defined now, then just
  85 ;;; let the later real PCL DEFUN of SB-PCL:CHECK-WRAPPER-VALIDITY
  86 ;;; overwrite it.
  87 (setf (symbol-function 'sb-kernel::pcl-check-wrapper-validity-hook)
  88       #'check-wrapper-validity)
  89
  90 (declaim (notinline make-a-method
  91                     add-named-method
  92                     ensure-generic-function-using-class
  93
  94                     add-method
  95                     remove-method))
  96
  97 (defvar *!early-functions*
  98         '((make-a-method early-make-a-method
  99                          real-make-a-method)
 100           (add-named-method early-add-named-method
 101                             real-add-named-method)
 102           ))
 103
 104 ;;; For each of the early functions, arrange to have it point to its
 105 ;;; early definition. Do this in a way that makes sure that if we
 106 ;;; redefine one of the early definitions the redefinition will take
 107 ;;; effect. This makes development easier.
 108 (dolist (fns *!early-functions*)
 109   (let ((name (car fns))
 110         (early-name (cadr fns)))
 111     (setf (gdefinition name)
 112             (set-function-name
 113              (lambda (&rest args)
 114                (apply (fdefinition early-name) args))
 115              name))))
 116
 117 ;;; *!GENERIC-FUNCTION-FIXUPS* is used by !FIX-EARLY-GENERIC-FUNCTIONS
 118 ;;; to convert the few functions in the bootstrap which are supposed
 119 ;;; to be generic functions but can't be early on.
 120 (defvar *!generic-function-fixups*
 121   '((add-method
 122      ((generic-function method)  ;lambda-list
 123       (standard-generic-function method) ;specializers
 124       real-add-method))          ;method-function
 125     (remove-method
 126      ((generic-function method)
 127       (standard-generic-function method)
 128       real-remove-method))
 129     (get-method
 130      ((generic-function qualifiers specializers &optional (errorp t))
 131       (standard-generic-function t t)
 132       real-get-method))
 133     (ensure-generic-function-using-class
 134      ((generic-function function-name
 135                         &key generic-function-class environment
 136                         &allow-other-keys)
 137       (generic-function t)
 138       real-ensure-gf-using-class--generic-function)
 139      ((generic-function function-name
 140                         &key generic-function-class environment
 141                         &allow-other-keys)
 142       (null t)
 143       real-ensure-gf-using-class--null))
 144     (make-method-lambda
 145      ((proto-generic-function proto-method lambda-expression environment)
 146       (standard-generic-function standard-method t t)
 147       real-make-method-lambda))
 148     (make-method-initargs-form
 149      ((proto-generic-function proto-method
 150                               lambda-expression
 151                               lambda-list environment)
 152       (standard-generic-function standard-method t t t)
 153       real-make-method-initargs-form))
 154     (compute-effective-method
 155      ((generic-function combin applicable-methods)
 156       (generic-function standard-method-combination t)
 157       standard-compute-effective-method))))
 158 \f
 159 (defmacro defgeneric (function-name lambda-list &body options)
 160   (expand-defgeneric function-name lambda-list options))
 161
 162 (defun expand-defgeneric (function-name lambda-list options)
 163   (let ((initargs ())
 164         (methods ()))
 165     (flet ((duplicate-option (name)
 166              (error 'sb-kernel:simple-program-error
 167                     :format-control "The option ~S appears more than once."
 168                     :format-arguments (list name)))
 169            (expand-method-definition (qab) ; QAB = qualifiers, arglist, body
 170              (let* ((arglist-pos (position-if #'listp qab))
 171                     (arglist (elt qab arglist-pos))
 172                     (qualifiers (subseq qab 0 arglist-pos))
 173                     (body (nthcdr (1+ arglist-pos) qab)))
 174                (when (not (equal (cadr (getf initargs :method-combination))
 175                                  qualifiers))
 176                  (error "bad method specification in DEFGENERIC ~A~%~
 177                          -- qualifier mismatch for lambda list ~A"
 178                         function-name arglist))
 179                `(defmethod ,function-name ,@qualifiers ,arglist ,@body))))
 180       (macrolet ((initarg (key) `(getf initargs ,key)))
 181         (dolist (option options)
 182           (let ((car-option (car option)))
 183             (case car-option
 184               (declare
 185                (push (cdr option) (initarg :declarations)))
 186               ((:argument-precedence-order :method-combination)
 187                (if (initarg car-option)
 188                    (duplicate-option car-option)
 189                    (setf (initarg car-option)
 190                          `',(cdr option))))
 191               ((:documentation :generic-function-class :method-class)
 192                (unless (sb-int:proper-list-of-length-p option 2)
 193                  (error "bad list length for ~S" option))
 194                (if (initarg car-option)
 195                    (duplicate-option car-option)
 196                    (setf (initarg car-option) `',(cadr option))))
 197               (:method
 198                (push (cdr option) methods))
 199               (t
 200                ;; ANSI requires that unsupported things must get a
 201                ;; PROGRAM-ERROR.
 202                (error 'sb-kernel:simple-program-error
 203                       :format-control "unsupported option ~S"
 204                       :format-arguments (list option))))))
 205
 206         (when (initarg :declarations)
 207           (setf (initarg :declarations)
 208                 `',(initarg :declarations))))
 209       `(progn
 210          (eval-when (:compile-toplevel :load-toplevel :execute)
 211            (compile-or-load-defgeneric ',function-name))
 212          (load-defgeneric ',function-name ',lambda-list ,@initargs)
 213          ,@(mapcar #'expand-method-definition methods)
 214          `,(function ,function-name)))))
 215
 216 (defun compile-or-load-defgeneric (function-name)
 217   (sb-kernel:proclaim-as-function-name function-name)
 218   (sb-kernel:note-name-defined function-name :function)
 219   (unless (eq (sb-int:info :function :where-from function-name) :declared)
 220     (setf (sb-int:info :function :where-from function-name) :defined)
 221     (setf (sb-int:info :function :type function-name)
 222           (sb-kernel:specifier-type 'function))))
 223
 224 (defun load-defgeneric (function-name lambda-list &rest initargs)
 225   (when (fboundp function-name)
 226     (sb-kernel::style-warn "redefining ~S in DEFGENERIC" function-name))
 227   (apply #'ensure-generic-function
 228          function-name
 229          :lambda-list lambda-list
 230          :definition-source `((defgeneric ,function-name)
 231                               ,*load-truename*)
 232          initargs))
 233 \f
 234 (defmacro defmethod (&rest args &environment env)
 235   (multiple-value-bind (name qualifiers lambda-list body)
 236       (parse-defmethod args)
 237     (multiple-value-bind (proto-gf proto-method)
 238         (prototypes-for-make-method-lambda name)
 239       (expand-defmethod name
 240                         proto-gf
 241                         proto-method
 242                         qualifiers
 243                         lambda-list
 244                         body
 245                         env))))
 246
 247 (defun prototypes-for-make-method-lambda (name)
 248   (if (not (eq *boot-state* 'complete))
 249       (values nil nil)
 250       (let ((gf? (and (gboundp name)
 251                       (gdefinition name))))
 252         (if (or (null gf?)
 253                 (not (generic-function-p gf?)))
 254             (values (class-prototype (find-class 'standard-generic-function))
 255                     (class-prototype (find-class 'standard-method)))
 256             (values gf?
 257                     (class-prototype (or (generic-function-method-class gf?)
 258                                          (find-class 'standard-method))))))))
 259
 260 ;;; Take a name which is either a generic function name or a list specifying
 261 ;;; a SETF generic function (like: (SETF <generic-function-name>)). Return
 262 ;;; the prototype instance of the method-class for that generic function.
 263 ;;;
 264 ;;; If there is no generic function by that name, this returns the
 265 ;;; default value, the prototype instance of the class
 266 ;;; STANDARD-METHOD. This default value is also returned if the spec
 267 ;;; names an ordinary function or even a macro. In effect, this leaves
 268 ;;; the signalling of the appropriate error until load time.
 269 ;;;
 270 ;;; Note: During bootstrapping, this function is allowed to return NIL.
 271 (defun method-prototype-for-gf (name)
 272   (let ((gf? (and (gboundp name)
 273                   (gdefinition name))))
 274     (cond ((neq *boot-state* 'complete) nil)
 275           ((or (null gf?)
 276                (not (generic-function-p gf?)))          ; Someone else MIGHT
 277                                                         ; error at load time.
 278            (class-prototype (find-class 'standard-method)))
 279           (t
 280             (class-prototype (or (generic-function-method-class gf?)
 281                                  (find-class 'standard-method)))))))
 282 \f
 283 (defvar *optimize-asv-funcall-p* nil)
 284 (defvar *asv-readers*)
 285 (defvar *asv-writers*)
 286 (defvar *asv-boundps*)
 287
 288 (defun expand-defmethod (name
 289                          proto-gf
 290                          proto-method
 291                          qualifiers
 292                          lambda-list
 293                          body
 294                          env)
 295   (let ((*make-instance-function-keys* nil)
 296         (*optimize-asv-funcall-p* t)
 297         (*asv-readers* nil) (*asv-writers* nil) (*asv-boundps* nil))
 298     (declare (special *make-instance-function-keys*))
 299     (multiple-value-bind (method-lambda unspecialized-lambda-list specializers)
 300         (add-method-declarations name qualifiers lambda-list body env)
 301       (multiple-value-bind (method-function-lambda initargs)
 302           (make-method-lambda proto-gf proto-method method-lambda env)
 303         (let ((initargs-form (make-method-initargs-form proto-gf
 304                                                         proto-method
 305                                                         method-function-lambda
 306                                                         initargs
 307                                                         env)))
 308           `(progn
 309              ;; Note: We could DECLAIM the ftype of the generic
 310              ;; function here, since ANSI specifies that we create it
 311              ;; if it does not exist. However, I chose not to, because
 312              ;; I think it's more useful to support a style of
 313              ;; programming where every generic function has an
 314              ;; explicit DEFGENERIC and any typos in DEFMETHODs are
 315              ;; warned about. Otherwise
 316              ;;   (DEFGENERIC FOO-BAR-BLETCH ((X T)))
 317              ;;   (DEFMETHOD FOO-BAR-BLETCH ((X HASH-TABLE)) ..)
 318              ;;   (DEFMETHOD FOO-BRA-BLETCH ((X SIMPLE-VECTOR)) ..)
 319              ;;   (DEFMETHOD FOO-BAR-BLETCH ((X VECTOR)) ..)
 320              ;;   (DEFMETHOD FOO-BAR-BLETCH ((X ARRAY)) ..)
 321              ;;   (DEFMETHOD FOO-BAR-BLETCH ((X LIST)) ..)
 322              ;; compiles without raising an error and runs without
 323              ;; raising an error (since SIMPLE-VECTOR cases fall
 324              ;; through to VECTOR) but still doesn't do what was
 325              ;; intended. I hate that kind of bug (code which silently
 326              ;; gives the wrong answer), so we don't do a DECLAIM
 327              ;; here. -- WHN 20000229
 328              ,@(when *make-instance-function-keys*
 329                  `((get-make-instance-functions
 330                     ',*make-instance-function-keys*)))
 331              ,@(when (or *asv-readers* *asv-writers* *asv-boundps*)
 332                  `((initialize-internal-slot-gfs*
 333                     ',*asv-readers* ',*asv-writers* ',*asv-boundps*)))
 334              ,(make-defmethod-form name qualifiers specializers
 335                                    unspecialized-lambda-list
 336                                    (if proto-method
 337                                        (class-name (class-of proto-method))
 338                                        'standard-method)
 339                                    initargs-form
 340                                    (getf (getf initargs ':plist)
 341                                          ':pv-table-symbol))))))))
 342
 343 (defun interned-symbol-p (x)
 344   (and (symbolp x) (symbol-package x)))
 345
 346 (defun make-defmethod-form (name qualifiers specializers
 347                                  unspecialized-lambda-list method-class-name
 348                                  initargs-form &optional pv-table-symbol)
 349   (let (fn
 350         fn-lambda)
 351     (if (and (interned-symbol-p (sb-int:function-name-block-name name))
 352              (every #'interned-symbol-p qualifiers)
 353              (every #'(lambda (s)
 354                         (if (consp s)
 355                             (and (eq (car s) 'eql)
 356                                  (constantp (cadr s))
 357                                  (let ((sv (eval (cadr s))))
 358                                    (or (interned-symbol-p sv)
 359                                        (integerp sv)
 360                                        (and (characterp sv)
 361                                             (standard-char-p sv)))))
 362                             (interned-symbol-p s)))
 363                     specializers)
 364              (consp initargs-form)
 365              (eq (car initargs-form) 'list*)
 366              (memq (cadr initargs-form) '(:function :fast-function))
 367              (consp (setq fn (caddr initargs-form)))
 368              (eq (car fn) 'function)
 369              (consp (setq fn-lambda (cadr fn)))
 370              (eq (car fn-lambda) 'lambda))
 371         (let* ((specls (mapcar (lambda (specl)
 372                                  (if (consp specl)
 373                                      `(,(car specl) ,(eval (cadr specl)))
 374                                    specl))
 375                                specializers))
 376                (mname `(,(if (eq (cadr initargs-form) ':function)
 377                              'method 'fast-method)
 378                         ,name ,@qualifiers ,specls))
 379                (mname-sym (intern (let ((*print-pretty* nil)
 380                                         ;; (We bind *PACKAGE* to
 381                                         ;; KEYWORD here as a way to
 382                                         ;; force symbols to be printed
 383                                         ;; with explicit package
 384                                         ;; prefixes.)
 385                                         (*package* sb-int:*keyword-package*))
 386                                     (format nil "~S" mname)))))
 387           `(progn
 388              (defun ,mname-sym ,(cadr fn-lambda)
 389                ,@(cddr fn-lambda))
 390              ,(make-defmethod-form-internal
 391                name qualifiers `',specls
 392                unspecialized-lambda-list method-class-name
 393                `(list* ,(cadr initargs-form)
 394                        #',mname-sym
 395                        ,@(cdddr initargs-form))
 396                pv-table-symbol)))
 397         (make-defmethod-form-internal
 398          name qualifiers
 399          `(list ,@(mapcar #'(lambda (specializer)
 400                               (if (consp specializer)
 401                                   ``(,',(car specializer)
 402                                      ,,(cadr specializer))
 403                                   `',specializer))
 404                           specializers))
 405          unspecialized-lambda-list method-class-name
 406          initargs-form
 407          pv-table-symbol))))
 408
 409 (defun make-defmethod-form-internal
 410     (name qualifiers specializers-form unspecialized-lambda-list
 411      method-class-name initargs-form &optional pv-table-symbol)
 412   `(load-defmethod
 413     ',method-class-name
 414     ',name
 415     ',qualifiers
 416     ,specializers-form
 417     ',unspecialized-lambda-list
 418     ,initargs-form
 419     ;; Paper over a bug in KCL by passing the cache-symbol here in
 420     ;; addition to in the list. FIXME: We should no longer need to do
 421     ;; this, since the CLOS code is now SBCL-specific, and doesn't
 422     ;; need to be ported to every buggy compiler in existence.
 423     ',pv-table-symbol))
 424
 425 (defmacro make-method-function (method-lambda &environment env)
 426   (make-method-function-internal method-lambda env))
 427
 428 (defun make-method-function-internal (method-lambda &optional env)
 429   (multiple-value-bind (proto-gf proto-method)
 430       (prototypes-for-make-method-lambda nil)
 431     (multiple-value-bind (method-function-lambda initargs)
 432         (make-method-lambda proto-gf proto-method method-lambda env)
 433       (make-method-initargs-form proto-gf
 434                                  proto-method
 435                                  method-function-lambda
 436                                  initargs
 437                                  env))))
 438
 439 (defun add-method-declarations (name qualifiers lambda-list body env)
 440   (multiple-value-bind (parameters unspecialized-lambda-list specializers)
 441       (parse-specialized-lambda-list lambda-list)
 442     (declare (ignore parameters))
 443     (multiple-value-bind (documentation declarations real-body)
 444         (extract-declarations body env)
 445       (values `(lambda ,unspecialized-lambda-list
 446                  ,@(when documentation `(,documentation))
 447                  (declare (%method-name ,(list name qualifiers specializers)))
 448                  (declare (%method-lambda-list ,@lambda-list))
 449                  ,@declarations
 450                  ,@real-body)
 451               unspecialized-lambda-list specializers))))
 452
 453 (defun real-make-method-initargs-form (proto-gf proto-method
 454                                        method-lambda initargs env)
 455   (declare (ignore proto-gf proto-method))
 456   (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
 457     (error "The METHOD-LAMBDA argument to MAKE-METHOD-FUNCTION, ~S, ~
 458             is not a lambda form."
 459            method-lambda))
 460   (make-method-initargs-form-internal method-lambda initargs env))
 461
 462 (unless (fboundp 'make-method-initargs-form)
 463   (setf (gdefinition 'make-method-initargs-form)
 464         (symbol-function 'real-make-method-initargs-form)))
 465
 466 (defun real-make-method-lambda (proto-gf proto-method method-lambda env)
 467   (declare (ignore proto-gf proto-method))
 468   (make-method-lambda-internal method-lambda env))
 469
 470 ;;; a helper function for creating Python-friendly type declarations
 471 ;;; in DEFMETHOD forms
 472 (defun parameter-specializer-declaration-in-defmethod (parameter specializer)
 473   (cond ((and (consp specializer)
 474               (eq (car specializer) 'eql))
 475          ;; KLUDGE: ANSI, in its wisdom, says that
 476          ;; EQL-SPECIALIZER-FORMs in EQL specializers are evaluated at
 477          ;; DEFMETHOD expansion time. Thus, although one might think
 478          ;; that in
 479          ;;   (DEFMETHOD FOO ((X PACKAGE)
 480          ;;                   (Y (EQL 12))
 481          ;;      ..))
 482          ;; the PACKAGE and (EQL 12) forms are both parallel type
 483          ;; names, they're not, as is made clear when you do
 484          ;;   (DEFMETHOD FOO ((X PACKAGE)
 485          ;;                   (Y (EQL 'BAR)))
 486          ;;     ..)
 487          ;; where Y needs to be a symbol named "BAR", not some cons
 488          ;; made by (CONS 'QUOTE 'BAR). I.e. when the
 489          ;; EQL-SPECIALIZER-FORM is (EQL 'X), it requires an argument
 490          ;; to be of type (EQL X). It'd be easy to transform one to
 491          ;; the other, but it'd be somewhat messier to do so while
 492          ;; ensuring that the EQL-SPECIALIZER-FORM is only EVAL'd
 493          ;; once. (The new code wouldn't be messy, but it'd require a
 494          ;; big transformation of the old code.) So instead we punt.
 495          ;; -- WHN 20000610
 496          '(ignorable))
 497         ((member specializer
 498                  ;; KLUDGE: For some low-level implementation
 499                  ;; classes, perhaps because of some problems related
 500                  ;; to the incomplete integration of PCL into SBCL's
 501                  ;; type system, some specializer classes can't be
 502                  ;; declared as argument types. E.g.
 503                  ;;   (DEFMETHOD FOO ((X SLOT-OBJECT))
 504                  ;;     (DECLARE (TYPE SLOT-OBJECT X))
 505                  ;;     ..)
 506                  ;; loses when
 507                  ;;   (DEFSTRUCT BAR A B)
 508                  ;;   (FOO (MAKE-BAR))
 509                  ;; perhaps because of the way that STRUCTURE-OBJECT
 510                  ;; inherits both from SLOT-OBJECT and from
 511                  ;; SB-KERNEL:INSTANCE. In an effort to sweep such
 512                  ;; problems under the rug, we exclude these problem
 513                  ;; cases by blacklisting them here. -- WHN 2001-01-19
 514                  '(slot-object))
 515          '(ignorable))
 516         ((not (eq *boot-state* 'complete))
 517          ;; KLUDGE: PCL, in its wisdom, sometimes calls methods with
 518          ;; types which don't match their specializers. (Specifically,
 519          ;; it calls ENSURE-CLASS-USING-CLASS (T NULL) with a non-NULL
 520          ;; second argument.) Hopefully it only does this kind of
 521          ;; weirdness when bootstrapping.. -- WHN 20000610
 522          '(ignorable))
 523         (t
 524          ;; Otherwise, we can make Python very happy.
 525          `(type ,specializer ,parameter))))
 526
 527 (defun make-method-lambda-internal (method-lambda &optional env)
 528   (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
 529     (error "The METHOD-LAMBDA argument to MAKE-METHOD-LAMBDA, ~S, ~
 530             is not a lambda form."
 531            method-lambda))
 532   (multiple-value-bind (documentation declarations real-body)
 533       (extract-declarations (cddr method-lambda) env)
 534     (let* ((name-decl (get-declaration '%method-name declarations))
 535            (sll-decl (get-declaration '%method-lambda-list declarations))
 536            (method-name (when (consp name-decl) (car name-decl)))
 537            (generic-function-name (when method-name (car method-name)))
 538            (specialized-lambda-list (or sll-decl (cadr method-lambda))))
 539       (multiple-value-bind (parameters lambda-list specializers)
 540           (parse-specialized-lambda-list specialized-lambda-list)
 541         (let* ((required-parameters
 542                 (mapcar (lambda (r s) (declare (ignore s)) r)
 543                         parameters
 544                         specializers))
 545                (slots (mapcar #'list required-parameters))
 546                (calls (list nil))
 547                (class-declarations
 548                 `(declare
 549                   ;; These declarations seem to be used by PCL to pass
 550                   ;; information to itself; when I tried to delete 'em
 551                   ;; ca. 0.6.10 it didn't work. I'm not sure how
 552                   ;; they work, but note the (VARIABLE-DECLARATION '%CLASS ..)
 553                   ;; expression in CAN-OPTIMIZE-ACCESS1. -- WHN 2000-12-30
 554                   ,@(remove nil
 555                             (mapcar (lambda (a s) (and (symbolp s)
 556                                                        (neq s t)
 557                                                        `(%class ,a ,s)))
 558                                     parameters
 559                                     specializers))
 560                   ;; These TYPE declarations weren't in the original
 561                   ;; PCL code, but the Python compiler likes them a
 562                   ;; lot. (We're telling the compiler about our
 563                   ;; knowledge of specialized argument types so that
 564                   ;; it can avoid run-time type dispatch overhead,
 565                   ;; which can be a huge win for Python.)
 566                   ;;
 567                   ;; FIXME: Perhaps these belong in
 568                   ;; ADD-METHOD-DECLARATIONS instead of here?
 569                   ,@(mapcar #'parameter-specializer-declaration-in-defmethod
 570                             parameters
 571                             specializers)))
 572                (method-lambda
 573                 ;; Remove the documentation string and insert the
 574                 ;; appropriate class declarations. The documentation
 575                 ;; string is removed to make it easy for us to insert
 576                 ;; new declarations later, they will just go after the
 577                 ;; CADR of the method lambda. The class declarations
 578                 ;; are inserted to communicate the class of the method's
 579                 ;; arguments to the code walk.
 580                 `(lambda ,lambda-list
 581                    ;; The default ignorability of method parameters
 582                    ;; doesn't seem to be specified by ANSI. PCL had
 583                    ;; them basically ignorable but was a little
 584                    ;; inconsistent. E.g. even though the two
 585                    ;; method definitions
 586                    ;;   (DEFMETHOD FOO ((X T) (Y T)) "Z")
 587                    ;;   (DEFMETHOD FOO ((X T) Y) "Z")
 588                    ;; are otherwise equivalent, PCL treated Y as
 589                    ;; ignorable in the first definition but not in the
 590                    ;; second definition. We make all required
 591                    ;; parameters ignorable as a way of systematizing
 592                    ;; the old PCL behavior. -- WHN 2000-11-24
 593                    (declare (ignorable ,@required-parameters))
 594                    ,class-declarations
 595                    ,@declarations
 596                    (block ,(sb-int:function-name-block-name
 597                             generic-function-name)
 598                      ,@real-body)))
 599                (constant-value-p (and (null (cdr real-body))
 600                                       (constantp (car real-body))))
 601                (constant-value (and constant-value-p
 602                                     (eval (car real-body))))
 603                (plist (and constant-value-p
 604                            (or (typep constant-value
 605                                       '(or number character))
 606                                (and (symbolp constant-value)
 607                                     (symbol-package constant-value)))
 608                            (list :constant-value constant-value)))
 609                (applyp (dolist (p lambda-list nil)
 610                          (cond ((memq p '(&optional &rest &key))
 611                                 (return t))
 612                                ((eq p '&aux)
 613                                 (return nil))))))
 614           (multiple-value-bind
 615               (walked-lambda call-next-method-p closurep next-method-p-p)
 616               (walk-method-lambda method-lambda
 617                                   required-parameters
 618                                   env
 619                                   slots
 620                                   calls)
 621             (multiple-value-bind
 622                 (ignore walked-declarations walked-lambda-body)
 623                 (extract-declarations (cddr walked-lambda))
 624               (declare (ignore ignore))
 625               (when (or next-method-p-p call-next-method-p)
 626                 (setq plist (list* :needs-next-methods-p t plist)))
 627               (when (some #'cdr slots)
 628                 (multiple-value-bind (slot-name-lists call-list)
 629                     (slot-name-lists-from-slots slots calls)
 630                   (let ((pv-table-symbol (make-symbol "pv-table")))
 631                     (setq plist
 632                           `(,@(when slot-name-lists
 633                                 `(:slot-name-lists ,slot-name-lists))
 634                               ,@(when call-list
 635                                   `(:call-list ,call-list))
 636                               :pv-table-symbol ,pv-table-symbol
 637                               ,@plist))
 638                     (setq walked-lambda-body
 639                           `((pv-binding (,required-parameters
 640                                          ,slot-name-lists
 641                                          ,pv-table-symbol)
 642                                         ,@walked-lambda-body))))))
 643               (when (and (memq '&key lambda-list)
 644                          (not (memq '&allow-other-keys lambda-list)))
 645                 (let ((aux (memq '&aux lambda-list)))
 646                 (setq lambda-list (nconc (ldiff lambda-list aux)
 647                                          (list '&allow-other-keys)
 648                                          aux))))
 649               (values `(lambda (.method-args. .next-methods.)
 650                          (simple-lexical-method-functions
 651                           (,lambda-list .method-args. .next-methods.
 652                                         :call-next-method-p
 653                                         ,call-next-method-p
 654                                         :next-method-p-p ,next-method-p-p
 655                                         :closurep ,closurep
 656                                         :applyp ,applyp)
 657                           ,@walked-declarations
 658                           ,@walked-lambda-body))
 659                       `(,@(when plist
 660                       `(:plist ,plist))
 661                           ,@(when documentation
 662                           `(:documentation ,documentation)))))))))))
 663
 664 (unless (fboundp 'make-method-lambda)
 665   (setf (gdefinition 'make-method-lambda)
 666         (symbol-function 'real-make-method-lambda)))
 667
 668 (defmacro simple-lexical-method-functions ((lambda-list
 669                                             method-args
 670                                             next-methods
 671                                             &rest lmf-options)
 672                                            &body body)
 673   `(progn
 674      ,method-args ,next-methods
 675      (bind-simple-lexical-method-macros (,method-args ,next-methods)
 676        (bind-lexical-method-functions (,@lmf-options)
 677          (bind-args (,lambda-list ,method-args)
 678            ,@body)))))
 679
 680 (defmacro fast-lexical-method-functions ((lambda-list
 681                                           next-method-call
 682                                           args
 683                                           rest-arg
 684                                           &rest lmf-options)
 685                                          &body body)
 686  `(bind-fast-lexical-method-macros (,args ,rest-arg ,next-method-call)
 687     (bind-lexical-method-functions (,@lmf-options)
 688       (bind-args (,(nthcdr (length args) lambda-list) ,rest-arg)
 689         ,@body))))
 690
 691 (defmacro bind-simple-lexical-method-macros ((method-args next-methods)
 692                                              &body body)
 693   `(macrolet ((call-next-method-bind (&body body)
 694                 `(let ((.next-method. (car ,',next-methods))
 695                        (,',next-methods (cdr ,',next-methods)))
 696                    .next-method. ,',next-methods
 697                    ,@body))
 698               (call-next-method-body (cnm-args)
 699                 `(if .next-method.
 700                      (funcall (if (std-instance-p .next-method.)
 701                                   (method-function .next-method.)
 702                                   .next-method.) ; for early methods
 703                               (or ,cnm-args ,',method-args)
 704                               ,',next-methods)
 705                      (error "no next method")))
 706               (next-method-p-body ()
 707                 `(not (null .next-method.))))
 708      ,@body))
 709
 710 (defstruct method-call
 711   (function #'identity :type function)
 712   call-method-args)
 713
 714 #-sb-fluid (declaim (sb-ext:freeze-type method-call))
 715
 716 (defmacro invoke-method-call1 (function args cm-args)
 717   `(let ((.function. ,function)
 718          (.args. ,args)
 719          (.cm-args. ,cm-args))
 720      (if (and .cm-args. (null (cdr .cm-args.)))
 721          (funcall .function. .args. (car .cm-args.))
 722          (apply .function. .args. .cm-args.))))
 723
 724 (defmacro invoke-method-call (method-call restp &rest required-args+rest-arg)
 725   `(invoke-method-call1 (method-call-function ,method-call)
 726                         ,(if restp
 727                              `(list* ,@required-args+rest-arg)
 728                              `(list ,@required-args+rest-arg))
 729                         (method-call-call-method-args ,method-call)))
 730
 731 (defstruct fast-method-call
 732   (function #'identity :type function)
 733   pv-cell
 734   next-method-call
 735   arg-info)
 736
 737 #-sb-fluid (declaim (sb-ext:freeze-type fast-method-call))
 738
 739 (defmacro fmc-funcall (fn pv-cell next-method-call &rest args)
 740   `(funcall ,fn ,pv-cell ,next-method-call ,@args))
 741
 742 (defmacro invoke-fast-method-call (method-call &rest required-args+rest-arg)
 743   `(fmc-funcall (fast-method-call-function ,method-call)
 744                 (fast-method-call-pv-cell ,method-call)
 745                 (fast-method-call-next-method-call ,method-call)
 746                 ,@required-args+rest-arg))
 747
 748 (defstruct fast-instance-boundp
 749   (index 0 :type fixnum))
 750
 751 #-sb-fluid (declaim (sb-ext:freeze-type fast-instance-boundp))
 752
 753 (eval-when (:compile-toplevel :load-toplevel :execute)
 754
 755 (defvar *allow-emf-call-tracing-p* nil)
 756 (defvar *enable-emf-call-tracing-p* #-testing nil #+testing t)
 757
 758 ) ; EVAL-WHEN
 759 \f
 760 ;;;; effective method functions
 761
 762 (defvar *emf-call-trace-size* 200)
 763 (defvar *emf-call-trace* nil)
 764 (defvar *emf-call-trace-index* 0)
 765
 766 ;;; This function was in the CMU CL version of PCL (ca Debian 2.4.8)
 767 ;;; without explanation. It appears to be intended for debugging, so
 768 ;;; it might be useful someday, so I haven't deleted it.
 769 ;;; But it isn't documented and isn't used for anything now, so
 770 ;;; I've conditionalized it out of the base system. -- WHN 19991213
 771 #+sb-show
 772 (defun show-emf-call-trace ()
 773   (when *emf-call-trace*
 774     (let ((j *emf-call-trace-index*)
 775           (*enable-emf-call-tracing-p* nil))
 776       (format t "~&(The oldest entries are printed first)~%")
 777       (dotimes-fixnum (i *emf-call-trace-size*)
 778         (let ((ct (aref *emf-call-trace* j)))
 779           (when ct (print ct)))
 780         (incf j)
 781         (when (= j *emf-call-trace-size*)
 782           (setq j 0))))))
 783
 784 (defun trace-emf-call-internal (emf format args)
 785   (unless *emf-call-trace*
 786     (setq *emf-call-trace* (make-array *emf-call-trace-size*)))
 787   (setf (aref *emf-call-trace* *emf-call-trace-index*)
 788         (list* emf format args))
 789   (incf *emf-call-trace-index*)
 790   (when (= *emf-call-trace-index* *emf-call-trace-size*)
 791     (setq *emf-call-trace-index* 0)))
 792
 793 (defmacro trace-emf-call (emf format args)
 794   (when *allow-emf-call-tracing-p*
 795     `(when *enable-emf-call-tracing-p*
 796        (trace-emf-call-internal ,emf ,format ,args))))
 797
 798 (defmacro invoke-effective-method-function-fast
 799     (emf restp &rest required-args+rest-arg)
 800   `(progn
 801      (trace-emf-call ,emf ,restp (list ,@required-args+rest-arg))
 802      (invoke-fast-method-call ,emf ,@required-args+rest-arg)))
 803
 804 (defmacro invoke-effective-method-function (emf restp
 805                                                 &rest required-args+rest-arg)
 806   (unless (constantp restp)
 807     (error "The RESTP argument is not constant."))
 808   (setq restp (eval restp))
 809   `(progn
 810      (trace-emf-call ,emf ,restp (list ,@required-args+rest-arg))
 811      (cond ((typep ,emf 'fast-method-call)
 812              (invoke-fast-method-call ,emf ,@required-args+rest-arg))
 813            ,@(when (and (null restp) (= 1 (length required-args+rest-arg)))
 814                `(((typep ,emf 'fixnum)
 815                   (let* ((.slots. (get-slots-or-nil
 816                                    ,(car required-args+rest-arg)))
 817                          (value (when .slots. (clos-slots-ref .slots. ,emf))))
 818                     (if (eq value +slot-unbound+)
 819                         (slot-unbound-internal ,(car required-args+rest-arg)
 820                                                ,emf)
 821                         value)))))
 822            ,@(when (and (null restp) (= 2 (length required-args+rest-arg)))
 823                `(((typep ,emf 'fixnum)
 824                   (let ((.new-value. ,(car required-args+rest-arg))
 825                         (.slots. (get-slots-or-nil
 826                                   ,(car required-args+rest-arg))))
 827                     (when .slots.
 828                          (setf (clos-slots-ref .slots. ,emf) .new-value.))))))
 829            #||
 830            ,@(when (and (null restp) (= 1 (length required-args+rest-arg)))
 831                `(((typep ,emf 'fast-instance-boundp)
 832                   (let ((.slots. (get-slots-or-nil
 833                                   ,(car required-args+rest-arg))))
 834                     (and .slots.
 835                          (not (eq (clos-slots-ref
 836                                    .slots. (fast-instance-boundp-index ,emf))
 837                                   +slot-unbound+)))))))
 838            ||#
 839            (t
 840             (etypecase ,emf
 841               (method-call
 842                (invoke-method-call ,emf ,restp ,@required-args+rest-arg))
 843               (function
 844                ,(if restp
 845                     `(apply (the function ,emf) ,@required-args+rest-arg)
 846                     `(funcall (the function ,emf)
 847                               ,@required-args+rest-arg))))))))
 848
 849 (defun invoke-emf (emf args)
 850   (trace-emf-call emf t args)
 851   (etypecase emf
 852     (fast-method-call
 853      (let* ((arg-info (fast-method-call-arg-info emf))
 854             (restp (cdr arg-info))
 855             (nreq (car arg-info)))
 856        (if restp
 857            (let* ((rest-args (nthcdr nreq args))
 858                   (req-args (ldiff args rest-args)))
 859              (apply (fast-method-call-function emf)
 860                     (fast-method-call-pv-cell emf)
 861                     (fast-method-call-next-method-call emf)
 862                     (nconc req-args (list rest-args))))
 863            (cond ((null args)
 864                   (if (eql nreq 0)
 865                       (invoke-fast-method-call emf)
 866                       (error "wrong number of args")))
 867                  ((null (cdr args))
 868                   (if (eql nreq 1)
 869                       (invoke-fast-method-call emf (car args))
 870                       (error "wrong number of args")))
 871                  ((null (cddr args))
 872                   (if (eql nreq 2)
 873                       (invoke-fast-method-call emf (car args) (cadr args))
 874                       (error "wrong number of args")))
 875                  (t
 876                   (apply (fast-method-call-function emf)
 877                          (fast-method-call-pv-cell emf)
 878                          (fast-method-call-next-method-call emf)
 879                          args))))))
 880     (method-call
 881      (apply (method-call-function emf)
 882             args
 883             (method-call-call-method-args emf)))
 884     (fixnum
 885      (cond ((null args) (error "1 or 2 args were expected."))
 886            ((null (cdr args))
 887             (let* ((slots (get-slots (car args)))
 888                    (value (clos-slots-ref slots emf)))
 889               (if (eq value +slot-unbound+)
 890                   (slot-unbound-internal (car args) emf)
 891                   value)))
 892            ((null (cddr args))
 893              (setf (clos-slots-ref (get-slots (cadr args)) emf)
 894                    (car args)))
 895            (t (error "1 or 2 args were expected."))))
 896     (fast-instance-boundp
 897      (if (or (null args) (cdr args))
 898          (error "1 arg was expected.")
 899        (let ((slots (get-slots (car args))))
 900          (not (eq (clos-slots-ref slots
 901                                   (fast-instance-boundp-index emf))
 902                   +slot-unbound+)))))
 903     (function
 904      (apply emf args))))
 905
 906 ;; KLUDGE: A comment from the original PCL said "This can be improved alot."
 907 (defun gf-make-function-from-emf (gf emf)
 908   (etypecase emf
 909     (fast-method-call (let* ((arg-info (gf-arg-info gf))
 910                              (nreq (arg-info-number-required arg-info))
 911                              (restp (arg-info-applyp arg-info)))
 912                         #'(lambda (&rest args)
 913                             (trace-emf-call emf t args)
 914                             (apply (fast-method-call-function emf)
 915                                    (fast-method-call-pv-cell emf)
 916                                    (fast-method-call-next-method-call emf)
 917                                    (if restp
 918                                        (let* ((rest-args (nthcdr nreq args))
 919                                               (req-args (ldiff args
 920                                                                rest-args)))
 921                                          (nconc req-args rest-args))
 922                                        args)))))
 923     (method-call #'(lambda (&rest args)
 924                      (trace-emf-call emf t args)
 925                      (apply (method-call-function emf)
 926                             args
 927                             (method-call-call-method-args emf))))
 928     (function emf)))
 929 \f
 930 (defmacro bind-fast-lexical-method-macros ((args rest-arg next-method-call)
 931                                            &body body)
 932   `(macrolet ((call-next-method-bind (&body body)
 933                 `(let () ,@body))
 934               (call-next-method-body (cnm-args)
 935                 `(if ,',next-method-call
 936                      ,(if (and (null ',rest-arg)
 937                                (consp cnm-args)
 938                                (eq (car cnm-args) 'list))
 939                           `(invoke-effective-method-function
 940                             ,',next-method-call nil
 941                             ,@(cdr cnm-args))
 942                           (let ((call `(invoke-effective-method-function
 943                                         ,',next-method-call
 944                                         ,',(not (null rest-arg))
 945                                         ,@',args
 946                                         ,@',(when rest-arg `(,rest-arg)))))
 947                             `(if ,cnm-args
 948                                  (bind-args ((,@',args
 949                                               ,@',(when rest-arg
 950                                                     `(&rest ,rest-arg)))
 951                                              ,cnm-args)
 952                                             ,call)
 953                                  ,call)))
 954                      (error "no next method")))
 955               (next-method-p-body ()
 956                 `(not (null ,',next-method-call))))
 957      ,@body))
 958
 959 (defmacro bind-lexical-method-functions
 960     ((&key call-next-method-p next-method-p-p closurep applyp)
 961      &body body)
 962   (cond ((and (null call-next-method-p) (null next-method-p-p)
 963               (null closurep)
 964               (null applyp))
 965          `(let () ,@body))
 966          ((and (null closurep)
 967                (null applyp))
 968          ;; OK to use MACROLET, and all args are mandatory
 969          ;; (else APPLYP would be true).
 970          `(call-next-method-bind
 971             (macrolet ((call-next-method (&rest cnm-args)
 972                          `(call-next-method-body ,(when cnm-args
 973                                                     `(list ,@cnm-args))))
 974                        (next-method-p ()
 975                          `(next-method-p-body)))
 976                ,@body)))
 977         (t
 978          `(call-next-method-bind
 979             (flet (,@(and call-next-method-p
 980                           '((call-next-method (&rest cnm-args)
 981                               (call-next-method-body cnm-args))))
 982                    ,@(and next-method-p-p
 983                           '((next-method-p ()
 984                               (next-method-p-body)))))
 985               ,@body)))))
 986
 987 (defmacro bind-args ((lambda-list args) &body body)
 988   (let ((args-tail '.args-tail.)
 989         (key '.key.)
 990         (state 'required))
 991     (flet ((process-var (var)
 992              (if (memq var lambda-list-keywords)
 993                  (progn
 994                    (case var
 995                      (&optional       (setq state 'optional))
 996                      (&key            (setq state 'key))
 997                      (&allow-other-keys)
 998                      (&rest           (setq state 'rest))
 999                      (&aux            (setq state 'aux))
1000                      (otherwise
1001                       (error
1002                        "encountered the non-standard lambda list keyword ~S"
1003                        var)))
1004                    nil)
1005                  (case state
1006                    (required `((,var (pop ,args-tail))))
1007                    (optional (cond ((not (consp var))
1008                                     `((,var (when ,args-tail
1009                                               (pop ,args-tail)))))
1010                                    ((null (cddr var))
1011                                     `((,(car var) (if ,args-tail
1012                                                       (pop ,args-tail)
1013                                                       ,(cadr var)))))
1014                                    (t
1015                                     `((,(caddr var) ,args-tail)
1016                                       (,(car var) (if ,args-tail
1017                                                       (pop ,args-tail)
1018                                                       ,(cadr var)))))))
1019                    (rest `((,var ,args-tail)))
1020                    (key (cond ((not (consp var))
1021                                `((,var (get-key-arg ,(sb-int:keywordicate var)
1022                                                     ,args-tail))))
1023                               ((null (cddr var))
1024                                (multiple-value-bind (keyword variable)
1025                                    (if (consp (car var))
1026                                        (values (caar var)
1027                                                (cadar var))
1028                                        (values (sb-int:keywordicate (car var))
1029                                                (car var)))
1030                                  `((,key (get-key-arg1 ',keyword ,args-tail))
1031                                    (,variable (if (consp ,key)
1032                                                   (car ,key)
1033                                                   ,(cadr var))))))
1034                               (t
1035                                (multiple-value-bind (keyword variable)
1036                                    (if (consp (car var))
1037                                        (values (caar var)
1038                                                (cadar var))
1039                                        (values (sb-int:keywordicate (car var))
1040                                                (car var)))
1041                                  `((,key (get-key-arg1 ',keyword ,args-tail))
1042                                    (,(caddr var) ,key)
1043                                    (,variable (if (consp ,key)
1044                                                   (car ,key)
1045                                                   ,(cadr var))))))))
1046                    (aux `(,var))))))
1047       (let ((bindings (mapcan #'process-var lambda-list)))
1048         `(let* ((,args-tail ,args)
1049                 ,@bindings)
1050            (declare (ignorable ,args-tail))
1051            ,@body)))))
1052
1053 (defun get-key-arg (keyword list)
1054   (loop (when (atom list) (return nil))
1055         (when (eq (car list) keyword) (return (cadr list)))
1056         (setq list (cddr list))))
1057
1058 (defun get-key-arg1 (keyword list)
1059   (loop (when (atom list) (return nil))
1060         (when (eq (car list) keyword) (return (cdr list)))
1061         (setq list (cddr list))))
1062
1063 (defun walk-method-lambda (method-lambda required-parameters env slots calls)
1064   (let ((call-next-method-p nil)   ; flag indicating that CALL-NEXT-METHOD
1065                                    ; should be in the method definition
1066         (closurep nil)             ; flag indicating that #'CALL-NEXT-METHOD
1067                                    ; was seen in the body of a method
1068         (next-method-p-p nil))     ; flag indicating that NEXT-METHOD-P
1069                                    ; should be in the method definition
1070     (flet ((walk-function (form context env)
1071              (cond ((not (eq context ':eval)) form)
1072                    ;; FIXME: Jumping to a conclusion from the way it's used
1073                    ;; above, perhaps CONTEXT should be called SITUATION
1074                    ;; (after the term used in the ANSI specification of
1075                    ;; EVAL-WHEN) and given modern ANSI keyword values
1076                    ;; like :LOAD-TOPLEVEL.
1077                    ((not (listp form)) form)
1078                    ((eq (car form) 'call-next-method)
1079                     (setq call-next-method-p t)
1080                     form)
1081                    ((eq (car form) 'next-method-p)
1082                     (setq next-method-p-p t)
1083                     form)
1084                    ((and (eq (car form) 'function)
1085                          (cond ((eq (cadr form) 'call-next-method)
1086                                 (setq call-next-method-p t)
1087                                 (setq closurep t)
1088                                 form)
1089                                ((eq (cadr form) 'next-method-p)
1090                                 (setq next-method-p-p t)
1091                                 (setq closurep t)
1092                                 form)
1093                                (t nil))))
1094                    ((and (memq (car form)
1095                                '(slot-value set-slot-value slot-boundp))
1096                          (constantp (caddr form)))
1097                      (let ((parameter
1098                             (can-optimize-access form required-parameters env)))
1099                       (let ((fun (ecase (car form)
1100                                    (slot-value #'optimize-slot-value)
1101                                    (set-slot-value #'optimize-set-slot-value)
1102                                    (slot-boundp #'optimize-slot-boundp))))
1103                         (funcall fun slots parameter form))))
1104                    ((and (eq (car form) 'apply)
1105                          (consp (cadr form))
1106                          (eq (car (cadr form)) 'function)
1107                          (generic-function-name-p (cadr (cadr form))))
1108                     (optimize-generic-function-call
1109                      form required-parameters env slots calls))
1110                    ((generic-function-name-p (car form))
1111                     (optimize-generic-function-call
1112                      form required-parameters env slots calls))
1113                    ((and (eq (car form) 'asv-funcall)
1114                          *optimize-asv-funcall-p*)
1115                     (case (fourth form)
1116                       (reader (push (third form) *asv-readers*))
1117                       (writer (push (third form) *asv-writers*))
1118                       (boundp (push (third form) *asv-boundps*)))
1119                     `(,(second form) ,@(cddddr form)))
1120                    (t form))))
1121
1122       (let ((walked-lambda (walk-form method-lambda env #'walk-function)))
1123         (values walked-lambda
1124                 call-next-method-p
1125                 closurep
1126                 next-method-p-p)))))
1127
1128 (defun generic-function-name-p (name)
1129   (and (sb-int:legal-function-name-p name)
1130        (gboundp name)
1131        (if (eq *boot-state* 'complete)
1132            (standard-generic-function-p (gdefinition name))
1133            (funcallable-instance-p (gdefinition name)))))
1134 \f
1135 (defvar *method-function-plist* (make-hash-table :test 'eq))
1136 (defvar *mf1* nil)
1137 (defvar *mf1p* nil)
1138 (defvar *mf1cp* nil)
1139 (defvar *mf2* nil)
1140 (defvar *mf2p* nil)
1141 (defvar *mf2cp* nil)
1142
1143 (defun method-function-plist (method-function)
1144   (unless (eq method-function *mf1*)
1145     (rotatef *mf1* *mf2*)
1146     (rotatef *mf1p* *mf2p*)
1147     (rotatef *mf1cp* *mf2cp*))
1148   (unless (or (eq method-function *mf1*) (null *mf1cp*))
1149     (setf (gethash *mf1* *method-function-plist*) *mf1p*))
1150   (unless (eq method-function *mf1*)
1151     (setf *mf1* method-function
1152           *mf1cp* nil
1153           *mf1p* (gethash method-function *method-function-plist*)))
1154   *mf1p*)
1155
1156 (defun (setf method-function-plist)
1157     (val method-function)
1158   (unless (eq method-function *mf1*)
1159     (rotatef *mf1* *mf2*)
1160     (rotatef *mf1cp* *mf2cp*)
1161     (rotatef *mf1p* *mf2p*))
1162   (unless (or (eq method-function *mf1*) (null *mf1cp*))
1163     (setf (gethash *mf1* *method-function-plist*) *mf1p*))
1164   (setf *mf1* method-function
1165         *mf1cp* t
1166         *mf1p* val))
1167
1168 (defun method-function-get (method-function key &optional default)
1169   (getf (method-function-plist method-function) key default))
1170
1171 (defun (setf method-function-get)
1172     (val method-function key)
1173   (setf (getf (method-function-plist method-function) key) val))
1174
1175 (defun method-function-pv-table (method-function)
1176   (method-function-get method-function :pv-table))
1177
1178 (defun method-function-method (method-function)
1179   (method-function-get method-function :method))
1180
1181 (defun method-function-needs-next-methods-p (method-function)
1182   (method-function-get method-function :needs-next-methods-p t))
1183 \f
1184 (defmacro method-function-closure-generator (method-function)
1185   `(method-function-get ,method-function 'closure-generator))
1186
1187 (defun load-defmethod
1188     (class name quals specls ll initargs &optional pv-table-symbol)
1189   (setq initargs (copy-tree initargs))
1190   (let ((method-spec (or (getf initargs ':method-spec)
1191                          (make-method-spec name quals specls))))
1192     (setf (getf initargs ':method-spec) method-spec)
1193     (record-definition 'method method-spec)
1194     (load-defmethod-internal class name quals specls
1195                              ll initargs pv-table-symbol)))
1196
1197 (defun load-defmethod-internal
1198     (method-class gf-spec qualifiers specializers lambda-list
1199                   initargs pv-table-symbol)
1200   (when pv-table-symbol
1201     (setf (getf (getf initargs ':plist) :pv-table-symbol)
1202           pv-table-symbol))
1203   (when (and (eq *boot-state* 'complete)
1204              (fboundp gf-spec))
1205     (let* ((gf (fdefinition gf-spec))
1206            (method (and (generic-function-p gf)
1207                         (find-method gf
1208                                      qualifiers
1209                                      (parse-specializers specializers)
1210                                      nil))))
1211       (when method
1212         (sb-kernel::style-warn "redefining ~S~{ ~S~} ~S in DEFMETHOD"
1213                                gf-spec qualifiers specializers))))
1214   (let ((method (apply #'add-named-method
1215                        gf-spec qualifiers specializers lambda-list
1216                        :definition-source `((defmethod ,gf-spec
1217                                                 ,@qualifiers
1218                                               ,specializers)
1219                                             ,*load-truename*)
1220                        initargs)))
1221     (unless (or (eq method-class 'standard-method)
1222                 (eq (find-class method-class nil) (class-of method)))
1223       ;; FIXME: should be STYLE-WARNING?
1224       (format *error-output*
1225               "~&At the time the method with qualifiers ~:S and~%~
1226                specializers ~:S on the generic function ~S~%~
1227                was compiled, the method-class for that generic function was~%~
1228                ~S. But, the method class is now ~S, this~%~
1229                may mean that this method was compiled improperly.~%"
1230               qualifiers specializers gf-spec
1231               method-class (class-name (class-of method))))
1232     method))
1233
1234 (defun make-method-spec (gf-spec qualifiers unparsed-specializers)
1235   `(method ,gf-spec ,@qualifiers ,unparsed-specializers))
1236
1237 (defun initialize-method-function (initargs &optional return-function-p method)
1238   (let* ((mf (getf initargs ':function))
1239          (method-spec (getf initargs ':method-spec))
1240          (plist (getf initargs ':plist))
1241          (pv-table-symbol (getf plist ':pv-table-symbol))
1242          (pv-table nil)
1243          (mff (getf initargs ':fast-function)))
1244     (flet ((set-mf-property (p v)
1245              (when mf
1246                (setf (method-function-get mf p) v))
1247              (when mff
1248                (setf (method-function-get mff p) v))))
1249       (when method-spec
1250         (when mf
1251           (setq mf (set-function-name mf method-spec)))
1252         (when mff
1253           (let ((name `(,(or (get (car method-spec) 'fast-sym)
1254                              (setf (get (car method-spec) 'fast-sym)
1255                                    ;; KLUDGE: If we're going to be
1256                                    ;; interning private symbols in our
1257                                    ;; a this way, it would be cleanest
1258                                    ;; to use a separate package
1259                                    ;; %PCL-PRIVATE or something, and
1260                                    ;; failing that, to use a special
1261                                    ;; symbol prefix denoting privateness.
1262                                    ;; -- WHN 19991201
1263                                    (intern (format nil "FAST-~A"
1264                                                    (car method-spec))
1265                                            *pcl-package*)))
1266                          ,@(cdr method-spec))))
1267             (set-function-name mff name)
1268             (unless mf
1269               (set-mf-property :name name)))))
1270       (when plist
1271         (let ((snl (getf plist :slot-name-lists))
1272               (cl (getf plist :call-list)))
1273           (when (or snl cl)
1274             (setq pv-table (intern-pv-table :slot-name-lists snl
1275                                             :call-list cl))
1276             (when pv-table (set pv-table-symbol pv-table))
1277             (set-mf-property :pv-table pv-table)))
1278         (loop (when (null plist) (return nil))
1279               (set-mf-property (pop plist) (pop plist)))
1280         (when method
1281           (set-mf-property :method method))
1282         (when return-function-p
1283           (or mf (method-function-from-fast-function mff)))))))
1284 \f
1285 (defun analyze-lambda-list (lambda-list)
1286   (flet (;; FIXME: Is this redundant with SB-C::MAKE-KEYWORD-FOR-ARG?
1287          (parse-keyword-argument (arg)
1288            (if (listp arg)
1289                (if (listp (car arg))
1290                    (caar arg)
1291                    (sb-int:keywordicate (car arg)))
1292                (sb-int:keywordicate arg))))
1293     (let ((nrequired 0)
1294           (noptional 0)
1295           (keysp nil)
1296           (restp nil)
1297           (allow-other-keys-p nil)
1298           (keywords ())
1299           (keyword-parameters ())
1300           (state 'required))
1301       (dolist (x lambda-list)
1302         (if (memq x lambda-list-keywords)
1303             (case x
1304               (&optional         (setq state 'optional))
1305               (&key              (setq keysp t
1306                                        state 'key))
1307               (&allow-other-keys (setq allow-other-keys-p t))
1308               (&rest             (setq restp t
1309                                        state 'rest))
1310               (&aux           (return t))
1311               (otherwise
1312                 (error "encountered the non-standard lambda list keyword ~S"
1313                        x)))
1314             (ecase state
1315               (required  (incf nrequired))
1316               (optional  (incf noptional))
1317               (key       (push (parse-keyword-argument x) keywords)
1318                          (push x keyword-parameters))
1319               (rest      ()))))
1320       (values nrequired noptional keysp restp allow-other-keys-p
1321               (reverse keywords)
1322               (reverse keyword-parameters)))))
1323
1324 (defun keyword-spec-name (x)
1325   (let ((key (if (atom x) x (car x))))
1326     (if (atom key)
1327         (intern (symbol-name key) sb-int:*keyword-package*)
1328         (car key))))
1329
1330 (defun ftype-declaration-from-lambda-list (lambda-list name)
1331   (multiple-value-bind (nrequired noptional keysp restp allow-other-keys-p
1332                                   keywords keyword-parameters)
1333       (analyze-lambda-list lambda-list)
1334     (declare (ignore keyword-parameters))
1335     (let* ((old (sb-int:info :function :type name)) ;FIXME:FDOCUMENTATION instead?
1336            (old-ftype (if (sb-kernel:function-type-p old) old nil))
1337            (old-restp (and old-ftype (sb-kernel:function-type-rest old-ftype)))
1338            (old-keys (and old-ftype
1339                           (mapcar #'sb-kernel:key-info-name
1340                                   (sb-kernel:function-type-keywords
1341                                    old-ftype))))
1342            (old-keysp (and old-ftype (sb-kernel:function-type-keyp old-ftype)))
1343            (old-allowp (and old-ftype
1344                             (sb-kernel:function-type-allowp old-ftype)))
1345            (keywords (union old-keys (mapcar #'keyword-spec-name keywords))))
1346       `(function ,(append (make-list nrequired :initial-element t)
1347                           (when (plusp noptional)
1348                             (append '(&optional)
1349                                     (make-list noptional :initial-element t)))
1350                           (when (or restp old-restp)
1351                             '(&rest t))
1352                           (when (or keysp old-keysp)
1353                             (append '(&key)
1354                                     (mapcar #'(lambda (key)
1355                                                 `(,key t))
1356                                             keywords)
1357                                     (when (or allow-other-keys-p old-allowp)
1358                                       '(&allow-other-keys)))))
1359                  *))))
1360
1361 (defun defgeneric-declaration (spec lambda-list)
1362   (when (consp spec)
1363     (setq spec (get-setf-function-name (cadr spec))))
1364   `(ftype ,(ftype-declaration-from-lambda-list lambda-list spec) ,spec))
1365 \f
1366 ;;;; early generic function support
1367
1368 (defvar *!early-generic-functions* ())
1369
1370 (defun ensure-generic-function (function-name
1371                                 &rest all-keys
1372                                 &key environment
1373                                 &allow-other-keys)
1374   (declare (ignore environment))
1375   (let ((existing (and (gboundp function-name)
1376                        (gdefinition function-name))))
1377     (if (and existing
1378              (eq *boot-state* 'complete)
1379              (null (generic-function-p existing)))
1380         (generic-clobbers-function function-name)
1381         (apply #'ensure-generic-function-using-class
1382                existing function-name all-keys))))
1383
1384 (defun generic-clobbers-function (function-name)
1385   (error 'sb-kernel:simple-program-error
1386          :format-control
1387          "~S already names an ordinary function or a macro."
1388          :format-arguments (list function-name)))
1389
1390 (defvar *sgf-wrapper*
1391   (boot-make-wrapper (early-class-size 'standard-generic-function)
1392                      'standard-generic-function))
1393
1394 (defvar *sgf-slots-init*
1395   (mapcar #'(lambda (canonical-slot)
1396               (if (memq (getf canonical-slot :name) '(arg-info source))
1397                   +slot-unbound+
1398                   (let ((initfunction (getf canonical-slot :initfunction)))
1399                     (if initfunction
1400                         (funcall initfunction)
1401                         +slot-unbound+))))
1402           (early-collect-inheritance 'standard-generic-function)))
1403
1404 (defvar *sgf-method-class-index*
1405   (!bootstrap-slot-index 'standard-generic-function 'method-class))
1406
1407 (defun early-gf-p (x)
1408   (and (fsc-instance-p x)
1409        (eq (clos-slots-ref (get-slots x) *sgf-method-class-index*)
1410            +slot-unbound+)))
1411
1412 (defvar *sgf-methods-index*
1413   (!bootstrap-slot-index 'standard-generic-function 'methods))
1414
1415 (defmacro early-gf-methods (gf)
1416   `(clos-slots-ref (get-slots ,gf) *sgf-methods-index*))
1417
1418 (defvar *sgf-arg-info-index*
1419   (!bootstrap-slot-index 'standard-generic-function 'arg-info))
1420
1421 (defmacro early-gf-arg-info (gf)
1422   `(clos-slots-ref (get-slots ,gf) *sgf-arg-info-index*))
1423
1424 (defvar *sgf-dfun-state-index*
1425   (!bootstrap-slot-index 'standard-generic-function 'dfun-state))
1426
1427 (defstruct (arg-info
1428              (:conc-name nil)
1429              (:constructor make-arg-info ()))
1430   (arg-info-lambda-list :no-lambda-list)
1431   arg-info-precedence
1432   arg-info-metatypes
1433   arg-info-number-optional
1434   arg-info-key/rest-p
1435   arg-info-keywords ;nil        no keyword or rest allowed
1436                     ;(k1 k2 ..) each method must accept these keyword arguments
1437                     ;T    must have &key or &rest
1438
1439   gf-info-simple-accessor-type ; nil, reader, writer, boundp
1440   (gf-precompute-dfun-and-emf-p nil) ; set by set-arg-info
1441
1442   gf-info-static-c-a-m-emf
1443   (gf-info-c-a-m-emf-std-p t)
1444   gf-info-fast-mf-p)
1445
1446 #-sb-fluid (declaim (sb-ext:freeze-type arg-info))
1447
1448 (defun arg-info-valid-p (arg-info)
1449   (not (null (arg-info-number-optional arg-info))))
1450
1451 (defun arg-info-applyp (arg-info)
1452   (or (plusp (arg-info-number-optional arg-info))
1453       (arg-info-key/rest-p arg-info)))
1454
1455 (defun arg-info-number-required (arg-info)
1456   (length (arg-info-metatypes arg-info)))
1457
1458 (defun arg-info-nkeys (arg-info)
1459   (count-if #'(lambda (x) (neq x t)) (arg-info-metatypes arg-info)))
1460
1461 ;;; Keep pages clean by not setting if the value is already the same.
1462 (defmacro esetf (pos val)
1463   (let ((valsym (gensym "value")))
1464     `(let ((,valsym ,val))
1465        (unless (equal ,pos ,valsym)
1466          (setf ,pos ,valsym)))))
1467
1468 (defun set-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
1469                         argument-precedence-order)
1470   (let* ((arg-info (if (eq *boot-state* 'complete)
1471                        (gf-arg-info gf)
1472                        (early-gf-arg-info gf)))
1473          (methods (if (eq *boot-state* 'complete)
1474                       (generic-function-methods gf)
1475                       (early-gf-methods gf)))
1476          (was-valid-p (integerp (arg-info-number-optional arg-info)))
1477          (first-p (and new-method (null (cdr methods)))))
1478     (when (and (not lambda-list-p) methods)
1479       (setq lambda-list (gf-lambda-list gf)))
1480     (when (or lambda-list-p
1481               (and first-p
1482                    (eq (arg-info-lambda-list arg-info) ':no-lambda-list)))
1483       (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1484           (analyze-lambda-list lambda-list)
1485         (when (and methods (not first-p))
1486           (let ((gf-nreq (arg-info-number-required arg-info))
1487                 (gf-nopt (arg-info-number-optional arg-info))
1488                 (gf-key/rest-p (arg-info-key/rest-p arg-info)))
1489             (unless (and (= nreq gf-nreq)
1490                          (= nopt gf-nopt)
1491                          (eq (or keysp restp) gf-key/rest-p))
1492               (error "The lambda-list ~S is incompatible with ~
1493                      existing methods of ~S."
1494                      lambda-list gf))))
1495         (when lambda-list-p
1496           (esetf (arg-info-lambda-list arg-info) lambda-list))
1497         (when (or lambda-list-p argument-precedence-order
1498                   (null (arg-info-precedence arg-info)))
1499           (esetf (arg-info-precedence arg-info)
1500                  (compute-precedence lambda-list nreq
1501                                      argument-precedence-order)))
1502         (esetf (arg-info-metatypes arg-info) (make-list nreq))
1503         (esetf (arg-info-number-optional arg-info) nopt)
1504         (esetf (arg-info-key/rest-p arg-info) (not (null (or keysp restp))))
1505         (esetf (arg-info-keywords arg-info)
1506                (if lambda-list-p
1507                    (if allow-other-keys-p t keywords)
1508                    (arg-info-key/rest-p arg-info)))))
1509     (when new-method
1510       (check-method-arg-info gf arg-info new-method))
1511     (set-arg-info1 gf arg-info new-method methods was-valid-p first-p)
1512     arg-info))
1513
1514 (defun check-method-arg-info (gf arg-info method)
1515   (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1516       (analyze-lambda-list (if (consp method)
1517                                (early-method-lambda-list method)
1518                                (method-lambda-list method)))
1519     (flet ((lose (string &rest args)
1520              (error
1521               "attempt to add the method ~S to the generic function ~S.~%~
1522                But ~A"
1523               method
1524               gf
1525               (apply #'format nil string args)))
1526            (compare (x y)
1527              (if (> x y) "more" "fewer")))
1528       (let ((gf-nreq (arg-info-number-required arg-info))
1529             (gf-nopt (arg-info-number-optional arg-info))
1530             (gf-key/rest-p (arg-info-key/rest-p arg-info))
1531             (gf-keywords (arg-info-keywords arg-info)))
1532         (unless (= nreq gf-nreq)
1533           (lose
1534            "the method has ~A required arguments than the generic function."
1535            (compare nreq gf-nreq)))
1536         (unless (= nopt gf-nopt)
1537           (lose
1538            "the method has ~S optional arguments than the generic function."
1539            (compare nopt gf-nopt)))
1540         (unless (eq (or keysp restp) gf-key/rest-p)
1541           (error
1542            "The method and generic function differ in whether they accept~%~
1543             &REST or &KEY arguments."))
1544         (when (consp gf-keywords)
1545           (unless (or (and restp (not keysp))
1546                       allow-other-keys-p
1547                       (every #'(lambda (k) (memq k keywords)) gf-keywords))
1548             (lose "the method does not accept each of the keyword arguments~%~
1549                    ~S."
1550                   gf-keywords)))))))
1551
1552 (defun set-arg-info1 (gf arg-info new-method methods was-valid-p first-p)
1553   (let* ((existing-p (and methods (cdr methods) new-method))
1554          (nreq (length (arg-info-metatypes arg-info)))
1555          (metatypes (if existing-p
1556                         (arg-info-metatypes arg-info)
1557                         (make-list nreq)))
1558          (type (if existing-p
1559                    (gf-info-simple-accessor-type arg-info)
1560                    nil)))
1561     (when (arg-info-valid-p arg-info)
1562       (dolist (method (if new-method (list new-method) methods))
1563         (let* ((specializers (if (or (eq *boot-state* 'complete)
1564                                      (not (consp method)))
1565                                  (method-specializers method)
1566                                  (early-method-specializers method t)))
1567                (class (if (or (eq *boot-state* 'complete) (not (consp method)))
1568                           (class-of method)
1569                           (early-method-class method)))
1570                (new-type (when (and class
1571                                     (or (not (eq *boot-state* 'complete))
1572                                         (eq (generic-function-method-combination gf)
1573                                             *standard-method-combination*)))
1574                            (cond ((eq class *the-class-standard-reader-method*)
1575                                   'reader)
1576                                  ((eq class *the-class-standard-writer-method*)
1577                                   'writer)
1578                                  ((eq class *the-class-standard-boundp-method*)
1579                                   'boundp)))))
1580           (setq metatypes (mapcar #'raise-metatype metatypes specializers))
1581           (setq type (cond ((null type) new-type)
1582                            ((eq type new-type) type)
1583                            (t nil)))))
1584       (esetf (arg-info-metatypes arg-info) metatypes)
1585       (esetf (gf-info-simple-accessor-type arg-info) type)))
1586   (when (or (not was-valid-p) first-p)
1587     (multiple-value-bind (c-a-m-emf std-p)
1588         (if (early-gf-p gf)
1589             (values t t)
1590             (compute-applicable-methods-emf gf))
1591       (esetf (gf-info-static-c-a-m-emf arg-info) c-a-m-emf)
1592       (esetf (gf-info-c-a-m-emf-std-p arg-info) std-p)
1593       (unless (gf-info-c-a-m-emf-std-p arg-info)
1594         (esetf (gf-info-simple-accessor-type arg-info) t))))
1595   (unless was-valid-p
1596     (let ((name (if (eq *boot-state* 'complete)
1597                     (generic-function-name gf)
1598                     (!early-gf-name gf))))
1599       (esetf (gf-precompute-dfun-and-emf-p arg-info)
1600              (let* ((sym (if (atom name) name (cadr name)))
1601                     (pkg-list (cons *pcl-package*
1602                                     (package-use-list *pcl-package*))))
1603                (and sym (symbolp sym)
1604                     (not (null (memq (symbol-package sym) pkg-list)))
1605                     (not (find #\space (symbol-name sym))))))))
1606   (esetf (gf-info-fast-mf-p arg-info)
1607          (or (not (eq *boot-state* 'complete))
1608              (let* ((method-class (generic-function-method-class gf))
1609                     (methods (compute-applicable-methods
1610                               #'make-method-lambda
1611                               (list gf (class-prototype method-class)
1612                                     '(lambda) nil))))
1613                (and methods (null (cdr methods))
1614                     (let ((specls (method-specializers (car methods))))
1615                       (and (classp (car specls))
1616                            (eq 'standard-generic-function
1617                                (class-name (car specls)))
1618                            (classp (cadr specls))
1619                            (eq 'standard-method
1620                                (class-name (cadr specls)))))))))
1621   arg-info)
1622
1623 ;;; This is the early definition of ENSURE-GENERIC-FUNCTION-USING-CLASS.
1624 ;;;
1625 ;;; The STATIC-SLOTS field of the funcallable instances used as early
1626 ;;; generic functions is used to store the early methods and early
1627 ;;; discriminator code for the early generic function. The static
1628 ;;; slots field of the fins contains a list whose:
1629 ;;;    CAR    -   a list of the early methods on this early gf
1630 ;;;    CADR   -   the early discriminator code for this method
1631 (defun ensure-generic-function-using-class (existing spec &rest keys
1632                                             &key (lambda-list nil lambda-list-p)
1633                                             &allow-other-keys)
1634   (declare (ignore keys))
1635   (cond ((and existing (early-gf-p existing))
1636          existing)
1637         ((assoc spec *!generic-function-fixups* :test #'equal)
1638          (if existing
1639              (make-early-gf spec lambda-list lambda-list-p existing)
1640              (error "The function ~S is not already defined." spec)))
1641         (existing
1642          (error "~S should be on the list ~S."
1643                 spec
1644                 '*!generic-function-fixups*))
1645         (t
1646          (pushnew spec *!early-generic-functions* :test #'equal)
1647          (make-early-gf spec lambda-list lambda-list-p))))
1648
1649 (defun make-early-gf (spec &optional lambda-list lambda-list-p function)
1650   (let ((fin (allocate-funcallable-instance *sgf-wrapper* *sgf-slots-init*)))
1651     (set-funcallable-instance-function
1652      fin
1653      (or function
1654          (if (eq spec 'print-object)
1655              #'(sb-kernel:instance-lambda (instance stream)
1656                  (print-unreadable-object (instance stream :identity t)
1657                    (format stream "std-instance")))
1658              #'(sb-kernel:instance-lambda (&rest args)
1659                  (declare (ignore args))
1660                  (error "The function of the funcallable-instance ~S~
1661                          has not been set." fin)))))
1662     (setf (gdefinition spec) fin)
1663     (!bootstrap-set-slot 'standard-generic-function fin 'name spec)
1664     (!bootstrap-set-slot 'standard-generic-function
1665                          fin
1666                          'source
1667                          *load-truename*)
1668     (set-function-name fin spec)
1669     (let ((arg-info (make-arg-info)))
1670       (setf (early-gf-arg-info fin) arg-info)
1671       (when lambda-list-p
1672         (proclaim (defgeneric-declaration spec lambda-list))
1673         (set-arg-info fin :lambda-list lambda-list)))
1674     fin))
1675
1676 (defun set-dfun (gf &optional dfun cache info)
1677   (when cache
1678     (setf (cache-owner cache) gf))
1679   (let ((new-state (if (and dfun (or cache info))
1680                        (list* dfun cache info)
1681                        dfun)))
1682     (if (eq *boot-state* 'complete)
1683         (setf (gf-dfun-state gf) new-state)
1684         (setf (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*)
1685               new-state)))
1686   dfun)
1687
1688 (defun gf-dfun-cache (gf)
1689   (let ((state (if (eq *boot-state* 'complete)
1690                    (gf-dfun-state gf)
1691                    (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
1692     (typecase state
1693       (function nil)
1694       (cons (cadr state)))))
1695
1696 (defun gf-dfun-info (gf)
1697   (let ((state (if (eq *boot-state* 'complete)
1698                    (gf-dfun-state gf)
1699                    (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
1700     (typecase state
1701       (function nil)
1702       (cons (cddr state)))))
1703
1704 (defvar *sgf-name-index*
1705   (!bootstrap-slot-index 'standard-generic-function 'name))
1706
1707 (defun !early-gf-name (gf)
1708   (clos-slots-ref (get-slots gf) *sgf-name-index*))
1709
1710 (defun gf-lambda-list (gf)
1711   (let ((arg-info (if (eq *boot-state* 'complete)
1712                       (gf-arg-info gf)
1713                       (early-gf-arg-info gf))))
1714     (if (eq ':no-lambda-list (arg-info-lambda-list arg-info))
1715         (let ((methods (if (eq *boot-state* 'complete)
1716                            (generic-function-methods gf)
1717                            (early-gf-methods gf))))
1718           (if (null methods)
1719               (progn
1720                 (warn "no way to determine the lambda list for ~S" gf)
1721                 nil)
1722               (let* ((method (car (last methods)))
1723                      (ll (if (consp method)
1724                              (early-method-lambda-list method)
1725                              (method-lambda-list method)))
1726                      (k (member '&key ll)))
1727                 (if k
1728                     (append (ldiff ll (cdr k)) '(&allow-other-keys))
1729                     ll))))
1730         (arg-info-lambda-list arg-info))))
1731
1732 (defmacro real-ensure-gf-internal (gf-class all-keys env)
1733   `(progn
1734      (cond ((symbolp ,gf-class)
1735             (setq ,gf-class (find-class ,gf-class t ,env)))
1736            ((classp ,gf-class))
1737            (t
1738             (error "The :GENERIC-FUNCTION-CLASS argument (~S) was neither a~%~
1739                     class nor a symbol that names a class."
1740                    ,gf-class)))
1741      (remf ,all-keys :generic-function-class)
1742      (remf ,all-keys :environment)
1743      (let ((combin (getf ,all-keys :method-combination '.shes-not-there.)))
1744        (unless (eq combin '.shes-not-there.)
1745          (setf (getf ,all-keys :method-combination)
1746                (find-method-combination (class-prototype ,gf-class)
1747                                         (car combin)
1748                                         (cdr combin)))))))
1749
1750 (defun real-ensure-gf-using-class--generic-function
1751        (existing
1752         function-name
1753         &rest all-keys
1754         &key environment (lambda-list nil lambda-list-p)
1755              (generic-function-class 'standard-generic-function gf-class-p)
1756         &allow-other-keys)
1757   (real-ensure-gf-internal generic-function-class all-keys environment)
1758   (unless (or (null gf-class-p)
1759               (eq (class-of existing) generic-function-class))
1760     (change-class existing generic-function-class))
1761   (prog1
1762       (apply #'reinitialize-instance existing all-keys)
1763     (when lambda-list-p
1764       (proclaim (defgeneric-declaration function-name lambda-list)))))
1765
1766 (defun real-ensure-gf-using-class--null
1767        (existing
1768         function-name
1769         &rest all-keys
1770         &key environment (lambda-list nil lambda-list-p)
1771              (generic-function-class 'standard-generic-function)
1772         &allow-other-keys)
1773   (declare (ignore existing))
1774   (real-ensure-gf-internal generic-function-class all-keys environment)
1775   (prog1
1776       (setf (gdefinition function-name)
1777             (apply #'make-instance generic-function-class
1778                    :name function-name all-keys))
1779     (when lambda-list-p
1780       (proclaim (defgeneric-declaration function-name lambda-list)))))
1781 \f
1782 (defun get-generic-function-info (gf)
1783   ;; values   nreq applyp metatypes nkeys arg-info
1784   (multiple-value-bind (applyp metatypes arg-info)
1785       (let* ((arg-info (if (early-gf-p gf)
1786                            (early-gf-arg-info gf)
1787                            (gf-arg-info gf)))
1788              (metatypes (arg-info-metatypes arg-info)))
1789         (values (arg-info-applyp arg-info)
1790                 metatypes
1791                 arg-info))
1792     (values (length metatypes) applyp metatypes
1793             (count-if #'(lambda (x) (neq x t)) metatypes)
1794             arg-info)))
1795
1796 (defun early-make-a-method (class qualifiers arglist specializers initargs doc
1797                             &optional slot-name)
1798   (initialize-method-function initargs)
1799   (let ((parsed ())
1800         (unparsed ()))
1801     ;; Figure out whether we got class objects or class names as the
1802     ;; specializers and set parsed and unparsed appropriately. If we
1803     ;; got class objects, then we can compute unparsed, but if we got
1804     ;; class names we don't try to compute parsed.
1805     ;;
1806     ;; Note that the use of not symbolp in this call to every should be
1807     ;; read as 'classp' we can't use classp itself because it doesn't
1808     ;; exist yet.
1809     (if (every #'(lambda (s) (not (symbolp s))) specializers)
1810         (setq parsed specializers
1811               unparsed (mapcar #'(lambda (s)
1812                                    (if (eq s t) t (class-name s)))
1813                                specializers))
1814         (setq unparsed specializers
1815               parsed ()))
1816     (list :early-method           ;This is an early method dammit!
1817
1818           (getf initargs ':function)
1819           (getf initargs ':fast-function)
1820
1821           parsed                  ;The parsed specializers. This is used
1822                                   ;by early-method-specializers to cache
1823                                   ;the parse. Note that this only comes
1824                                   ;into play when there is more than one
1825                                   ;early method on an early gf.
1826
1827           (list class        ;A list to which real-make-a-method
1828                 qualifiers      ;can be applied to make a real method
1829                 arglist    ;corresponding to this early one.
1830                 unparsed
1831                 initargs
1832                 doc
1833                 slot-name))))
1834
1835 (defun real-make-a-method
1836        (class qualifiers lambda-list specializers initargs doc
1837         &optional slot-name)
1838   (setq specializers (parse-specializers specializers))
1839   (apply #'make-instance class
1840          :qualifiers qualifiers
1841          :lambda-list lambda-list
1842          :specializers specializers
1843          :documentation doc
1844          :slot-name slot-name
1845          :allow-other-keys t
1846          initargs))
1847
1848 (defun early-method-function (early-method)
1849   (values (cadr early-method) (caddr early-method)))
1850
1851 (defun early-method-class (early-method)
1852   (find-class (car (fifth early-method))))
1853
1854 (defun early-method-standard-accessor-p (early-method)
1855   (let ((class (first (fifth early-method))))
1856     (or (eq class 'standard-reader-method)
1857         (eq class 'standard-writer-method)
1858         (eq class 'standard-boundp-method))))
1859
1860 (defun early-method-standard-accessor-slot-name (early-method)
1861   (seventh (fifth early-method)))
1862
1863 ;;; Fetch the specializers of an early method. This is basically just
1864 ;;; a simple accessor except that when the second argument is t, this
1865 ;;; converts the specializers from symbols into class objects. The
1866 ;;; class objects are cached in the early method, this makes
1867 ;;; bootstrapping faster because the class objects only have to be
1868 ;;; computed once.
1869 ;;;
1870 ;;; NOTE:
1871 ;;;  The second argument should only be passed as T by
1872 ;;;  early-lookup-method. This is to implement the rule that only when
1873 ;;;  there is more than one early method on a generic function is the
1874 ;;;  conversion from class names to class objects done. This
1875 ;;;  corresponds to the fact that we are only allowed to have one
1876 ;;;  method on any generic function up until the time classes exist.
1877 (defun early-method-specializers (early-method &optional objectsp)
1878   (if (and (listp early-method)
1879            (eq (car early-method) :early-method))
1880       (cond ((eq objectsp t)
1881              (or (fourth early-method)
1882                  (setf (fourth early-method)
1883                        (mapcar #'find-class (cadddr (fifth early-method))))))
1884             (t
1885              (cadddr (fifth early-method))))
1886       (error "~S is not an early-method." early-method)))
1887
1888 (defun early-method-qualifiers (early-method)
1889   (cadr (fifth early-method)))
1890
1891 (defun early-method-lambda-list (early-method)
1892   (caddr (fifth early-method)))
1893
1894 (defun early-add-named-method (generic-function-name
1895                                qualifiers
1896                                specializers
1897                                arglist
1898                                &rest initargs)
1899   (let* ((gf (ensure-generic-function generic-function-name))
1900          (existing
1901            (dolist (m (early-gf-methods gf))
1902              (when (and (equal (early-method-specializers m) specializers)
1903                         (equal (early-method-qualifiers m) qualifiers))
1904                (return m))))
1905          (new (make-a-method 'standard-method
1906                              qualifiers
1907                              arglist
1908                              specializers
1909                              initargs
1910                              ())))
1911     (when existing (remove-method gf existing))
1912     (add-method gf new)))
1913
1914 ;;; This is the early version of ADD-METHOD. Later this will become a
1915 ;;; generic function. See !FIX-EARLY-GENERIC-FUNCTIONS which has
1916 ;;; special knowledge about ADD-METHOD.
1917 (defun add-method (generic-function method)
1918   (when (not (fsc-instance-p generic-function))
1919     (error "Early ADD-METHOD didn't get a funcallable instance."))
1920   (when (not (and (listp method) (eq (car method) :early-method)))
1921     (error "Early ADD-METHOD didn't get an early method."))
1922   (push method (early-gf-methods generic-function))
1923   (set-arg-info generic-function :new-method method)
1924   (unless (assoc (!early-gf-name generic-function)
1925                  *!generic-function-fixups*
1926                  :test #'equal)
1927     (update-dfun generic-function)))
1928
1929 ;;; This is the early version of REMOVE-METHOD. See comments on
1930 ;;; the early version of ADD-METHOD.
1931 (defun remove-method (generic-function method)
1932   (when (not (fsc-instance-p generic-function))
1933     (error "An early remove-method didn't get a funcallable instance."))
1934   (when (not (and (listp method) (eq (car method) :early-method)))
1935     (error "An early remove-method didn't get an early method."))
1936   (setf (early-gf-methods generic-function)
1937         (remove method (early-gf-methods generic-function)))
1938   (set-arg-info generic-function)
1939   (unless (assoc (!early-gf-name generic-function)
1940                  *!generic-function-fixups*
1941                  :test #'equal)
1942     (update-dfun generic-function)))
1943
1944 ;;; This is the early version of GET-METHOD. See comments on the early
1945 ;;; version of ADD-METHOD.
1946 (defun get-method (generic-function qualifiers specializers
1947                                     &optional (errorp t))
1948   (if (early-gf-p generic-function)
1949       (or (dolist (m (early-gf-methods generic-function))
1950             (when (and (or (equal (early-method-specializers m nil)
1951                                   specializers)
1952                            (equal (early-method-specializers m t)
1953                                   specializers))
1954                        (equal (early-method-qualifiers m) qualifiers))
1955               (return m)))
1956           (if errorp
1957               (error "can't get early method")
1958               nil))
1959       (real-get-method generic-function qualifiers specializers errorp)))
1960
1961 (defun !fix-early-generic-functions ()
1962   (sb-int:/show "entering !FIX-EARLY-GENERIC-FUNCTIONS")
1963   (let ((accessors nil))
1964     ;; Rearrange *!EARLY-GENERIC-FUNCTIONS* to speed up
1965     ;; FIX-EARLY-GENERIC-FUNCTIONS.
1966     (dolist (early-gf-spec *!early-generic-functions*)
1967       (sb-int:/show early-gf-spec)
1968       (when (every #'early-method-standard-accessor-p
1969                    (early-gf-methods (gdefinition early-gf-spec)))
1970         (push early-gf-spec accessors)))
1971     (dolist (spec (nconc accessors
1972                          '(accessor-method-slot-name
1973                            generic-function-methods
1974                            method-specializers
1975                            specializerp
1976                            specializer-type
1977                            specializer-class
1978                            slot-definition-location
1979                            slot-definition-name
1980                            class-slots
1981                            gf-arg-info
1982                            class-precedence-list
1983                            slot-boundp-using-class
1984                            (setf slot-value-using-class)
1985                            slot-value-using-class
1986                            structure-class-p
1987                            standard-class-p
1988                            funcallable-standard-class-p
1989                            specializerp)))
1990       (sb-int:/show spec)
1991       (setq *!early-generic-functions*
1992             (cons spec
1993                   (delete spec *!early-generic-functions* :test #'equal))))
1994
1995     (dolist (early-gf-spec *!early-generic-functions*)
1996       (sb-int:/show early-gf-spec)
1997       (let* ((gf (gdefinition early-gf-spec))
1998              (methods (mapcar #'(lambda (early-method)
1999                                   (let ((args (copy-list (fifth
2000                                                           early-method))))
2001                                     (setf (fourth args)
2002                                           (early-method-specializers
2003                                            early-method t))
2004                                     (apply #'real-make-a-method args)))
2005                               (early-gf-methods gf))))
2006         (setf (generic-function-method-class gf) *the-class-standard-method*)
2007         (setf (generic-function-method-combination gf)
2008               *standard-method-combination*)
2009         (set-methods gf methods)))
2010
2011     (dolist (fn *!early-functions*)
2012       (sb-int:/show fn)
2013       (setf (gdefinition (car fn)) (fdefinition (caddr fn))))
2014
2015     (dolist (fixup *!generic-function-fixups*)
2016       (sb-int:/show fixup)
2017       (let* ((fspec (car fixup))
2018              (gf (gdefinition fspec))
2019              (methods (mapcar #'(lambda (method)
2020                                   (let* ((lambda-list (first method))
2021                                          (specializers (second method))
2022                                          (method-fn-name (third method))
2023                                          (fn-name (or method-fn-name fspec))
2024                                          (fn (fdefinition fn-name))
2025                                          (initargs
2026                                           (list :function
2027                                                 (set-function-name
2028                                                  #'(lambda (args next-methods)
2029                                                      (declare (ignore
2030                                                                next-methods))
2031                                                      (apply fn args))
2032                                                  `(call ,fn-name)))))
2033                                     (declare (type function fn))
2034                                     (make-a-method 'standard-method
2035                                                    ()
2036                                                    lambda-list
2037                                                    specializers
2038                                                    initargs
2039                                                    nil)))
2040                               (cdr fixup))))
2041         (setf (generic-function-method-class gf) *the-class-standard-method*)
2042         (setf (generic-function-method-combination gf)
2043               *standard-method-combination*)
2044         (set-methods gf methods))))
2045   (sb-int:/show "leaving !FIX-EARLY-GENERIC-FUNCTIONS"))
2046 \f
2047 ;;; PARSE-DEFMETHOD is used by DEFMETHOD to parse the &REST argument
2048 ;;; into the 'real' arguments. This is where the syntax of DEFMETHOD
2049 ;;; is really implemented.
2050 (defun parse-defmethod (cdr-of-form)
2051   ;;(declare (values name qualifiers specialized-lambda-list body))
2052   (let ((name (pop cdr-of-form))
2053         (qualifiers ())
2054         (spec-ll ()))
2055     (loop (if (and (car cdr-of-form) (atom (car cdr-of-form)))
2056               (push (pop cdr-of-form) qualifiers)
2057               (return (setq qualifiers (nreverse qualifiers)))))
2058     (setq spec-ll (pop cdr-of-form))
2059     (values name qualifiers spec-ll cdr-of-form)))
2060
2061 (defun parse-specializers (specializers)
2062   (flet ((parse (spec)
2063            (let ((result (specializer-from-type spec)))
2064              (if (specializerp result)
2065                  result
2066                  (if (symbolp spec)
2067                      (error "~S was used as a specializer,~%~
2068                              but is not the name of a class."
2069                             spec)
2070                      (error "~S is not a legal specializer." spec))))))
2071     (mapcar #'parse specializers)))
2072
2073 (defun unparse-specializers (specializers-or-method)
2074   (if (listp specializers-or-method)
2075       (flet ((unparse (spec)
2076                (if (specializerp spec)
2077                    (let ((type (specializer-type spec)))
2078                      (if (and (consp type)
2079                               (eq (car type) 'class))
2080                          (let* ((class (cadr type))
2081                                 (class-name (class-name class)))
2082                            (if (eq class (find-class class-name nil))
2083                                class-name
2084                                type))
2085                          type))
2086                    (error "~S is not a legal specializer." spec))))
2087         (mapcar #'unparse specializers-or-method))
2088       (unparse-specializers (method-specializers specializers-or-method))))
2089
2090 (defun parse-method-or-spec (spec &optional (errorp t))
2091   (let (gf method name temp)
2092     (if (method-p spec)
2093         (setq method spec
2094               gf (method-generic-function method)
2095               temp (and gf (generic-function-name gf))
2096               name (if temp
2097                        (intern-function-name
2098                          (make-method-spec temp
2099                                            (method-qualifiers method)
2100                                            (unparse-specializers
2101                                              (method-specializers method))))
2102                        (make-symbol (format nil "~S" method))))
2103         (multiple-value-bind (gf-spec quals specls)
2104             (parse-defmethod spec)
2105           (and (setq gf (and (or errorp (gboundp gf-spec))
2106                              (gdefinition gf-spec)))
2107                (let ((nreq (compute-discriminating-function-arglist-info gf)))
2108                  (setq specls (append (parse-specializers specls)
2109                                       (make-list (- nreq (length specls))
2110                                                  :initial-element
2111                                                  *the-class-t*)))
2112                  (and
2113                    (setq method (get-method gf quals specls errorp))
2114                    (setq name
2115                          (intern-function-name (make-method-spec gf-spec
2116                                                                  quals
2117                                                                  specls))))))))
2118     (values gf method name)))
2119 \f
2120 (defun extract-parameters (specialized-lambda-list)
2121   (multiple-value-bind (parameters ignore1 ignore2)
2122       (parse-specialized-lambda-list specialized-lambda-list)
2123     (declare (ignore ignore1 ignore2))
2124     parameters))
2125
2126 (defun extract-lambda-list (specialized-lambda-list)
2127   (multiple-value-bind (ignore1 lambda-list ignore2)
2128       (parse-specialized-lambda-list specialized-lambda-list)
2129     (declare (ignore ignore1 ignore2))
2130     lambda-list))
2131
2132 (defun extract-specializer-names (specialized-lambda-list)
2133   (multiple-value-bind (ignore1 ignore2 specializers)
2134       (parse-specialized-lambda-list specialized-lambda-list)
2135     (declare (ignore ignore1 ignore2))
2136     specializers))
2137
2138 (defun extract-required-parameters (specialized-lambda-list)
2139   (multiple-value-bind (ignore1 ignore2 ignore3 required-parameters)
2140       (parse-specialized-lambda-list specialized-lambda-list)
2141     (declare (ignore ignore1 ignore2 ignore3))
2142     required-parameters))
2143
2144 (defun parse-specialized-lambda-list (arglist &optional post-keyword)
2145   ;;(declare (values parameters lambda-list specializers required-parameters))
2146   (let ((arg (car arglist)))
2147     (cond ((null arglist) (values nil nil nil nil))
2148           ((eq arg '&aux)
2149            (values nil arglist nil))
2150           ((memq arg lambda-list-keywords)
2151            (unless (memq arg '(&optional &rest &key &allow-other-keys &aux))
2152              ;; Warn about non-standard lambda-list-keywords, but then
2153              ;; go on to treat them like a standard lambda-list-keyword
2154              ;; what with the warning its probably ok.
2155              ;;
2156              ;; FIXME: This shouldn't happen now that this is maintained
2157              ;; as part of SBCL, should it? Perhaps this is now
2158              ;; "internal error: unrecognized lambda-list keyword ~S"?
2159              (warn "Unrecognized lambda-list keyword ~S in arglist.~%~
2160                     Assuming that the symbols following it are parameters,~%~
2161                     and not allowing any parameter specializers to follow it."
2162                    arg))
2163            ;; When we are at a lambda-list keyword, the parameters
2164            ;; don't include the lambda-list keyword; the lambda-list
2165            ;; does include the lambda-list keyword; and no
2166            ;; specializers are allowed to follow the lambda-list
2167            ;; keywords (at least for now).
2168            (multiple-value-bind (parameters lambda-list)
2169                (parse-specialized-lambda-list (cdr arglist) t)
2170              (values parameters
2171                      (cons arg lambda-list)
2172                      ()
2173                      ())))
2174           (post-keyword
2175            ;; After a lambda-list keyword there can be no specializers.
2176            (multiple-value-bind (parameters lambda-list)
2177                (parse-specialized-lambda-list (cdr arglist) t)
2178              (values (cons (if (listp arg) (car arg) arg) parameters)
2179                      (cons arg lambda-list)
2180                      ()
2181                      ())))
2182           (t
2183            (multiple-value-bind (parameters lambda-list specializers required)
2184                (parse-specialized-lambda-list (cdr arglist))
2185              (values (cons (if (listp arg) (car arg) arg) parameters)
2186                      (cons (if (listp arg) (car arg) arg) lambda-list)
2187                      (cons (if (listp arg) (cadr arg) t) specializers)
2188                      (cons (if (listp arg) (car arg) arg) required)))))))
2189 \f
2190 (setq *boot-state* 'early)
2191 \f
2192 ;;; FIXME: In here there was a #-CMU definition of SYMBOL-MACROLET
2193 ;;; which used %WALKER stuff. That suggests to me that maybe the code
2194 ;;; walker stuff was only used for implementing stuff like that; maybe
2195 ;;; it's not needed any more? Hunt down what it was used for and see.
2196
2197 (defmacro with-slots (slots instance &body body)
2198   (let ((in (gensym)))
2199     `(let ((,in ,instance))
2200        (declare (ignorable ,in))
2201        ,@(let ((instance (if (and (consp instance) (eq (car instance) 'the))
2202                              (third instance)
2203                              instance)))
2204            (and (symbolp instance)
2205                 `((declare (%variable-rebinding ,in ,instance)))))
2206        ,in
2207        (symbol-macrolet ,(mapcar #'(lambda (slot-entry)
2208                                      (let ((variable-name
2209                                             (if (symbolp slot-entry)
2210                                                 slot-entry
2211                                                 (car slot-entry)))
2212                                            (slot-name
2213                                             (if (symbolp slot-entry)
2214                                                 slot-entry
2215                                                 (cadr slot-entry))))
2216                                        `(,variable-name
2217                                           (slot-value ,in ',slot-name))))
2218                                  slots)
2219                         ,@body))))
2220
2221 (defmacro with-accessors (slots instance &body body)
2222   (let ((in (gensym)))
2223     `(let ((,in ,instance))
2224        (declare (ignorable ,in))
2225        ,@(let ((instance (if (and (consp instance) (eq (car instance) 'the))
2226                              (third instance)
2227                              instance)))
2228            (and (symbolp instance)
2229                 `((declare (%variable-rebinding ,in ,instance)))))
2230        ,in
2231        (symbol-macrolet ,(mapcar #'(lambda (slot-entry)
2232                                    (let ((variable-name (car slot-entry))
2233                                          (accessor-name (cadr slot-entry)))
2234                                      `(,variable-name
2235                                         (,accessor-name ,in))))
2236                                slots)
2237           ,@body))))