src/pcl/macros.lisp

   1 ;;;; macros, global variable definitions, and other miscellaneous support stuff
   2 ;;;; used by the rest of the PCL subsystem
   3
   4 ;;;; This software is part of the SBCL system. See the README file for
   5 ;;;; more information.
   6
   7 ;;;; This software is derived from software originally released by Xerox
   8 ;;;; Corporation. Copyright and release statements follow. Later modifications
   9 ;;;; to the software are in the public domain and are provided with
  10 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
  11 ;;;; information.
  12
  13 ;;;; copyright information from original PCL sources:
  14 ;;;;
  15 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
  16 ;;;; All rights reserved.
  17 ;;;;
  18 ;;;; Use and copying of this software and preparation of derivative works based
  19 ;;;; upon this software are permitted. Any distribution of this software or
  20 ;;;; derivative works must comply with all applicable United States export
  21 ;;;; control laws.
  22 ;;;;
  23 ;;;; This software is made available AS IS, and Xerox Corporation makes no
  24 ;;;; warranty about the software, its performance or its conformity to any
  25 ;;;; specification.
  26
  27 (in-package "SB-PCL")
  28 \f
  29 (/show "starting pcl/macros.lisp")
  30
  31 (declaim (declaration
  32           ;; As of sbcl-0.7.0.6, SBCL actively uses this declaration
  33           ;; to propagate information needed to set up nice debug
  34           ;; names (as seen e.g. in BACKTRACE) for method functions.
  35           %method-name
  36           ;; These nonstandard declarations seem to be used privately
  37           ;; within PCL itself to pass information around, so we can't
  38           ;; just delete them.
  39           %class
  40           %method-lambda-list
  41           ;; This declaration may also be used within PCL to pass
  42           ;; information around, I'm not sure. -- WHN 2000-12-30
  43           %variable-rebinding))
  44
  45 (/show "done with DECLAIM DECLARATION")
  46
  47 (defun get-declaration (name declarations &optional default)
  48   (dolist (d declarations default)
  49     (dolist (form (cdr d))
  50       (when (and (consp form) (eq (car form) name))
  51         (return-from get-declaration (cdr form))))))
  52
  53 (/show "pcl/macros.lisp 85")
  54
  55 (defmacro doplist ((key val) plist &body body)
  56   `(let ((.plist-tail. ,plist) ,key ,val)
  57      (loop (when (null .plist-tail.) (return nil))
  58            (setq ,key (pop .plist-tail.))
  59            (when (null .plist-tail.)
  60              (error "malformed plist, odd number of elements"))
  61            (setq ,val (pop .plist-tail.))
  62            (progn ,@body))))
  63
  64 (/show "pcl/macros.lisp 101")
  65
  66 (defmacro dolist-carefully ((var list improper-list-handler) &body body)
  67   `(let ((,var nil)
  68          (.dolist-carefully. ,list))
  69      (loop (when (null .dolist-carefully.) (return nil))
  70            (if (consp .dolist-carefully.)
  71                (progn
  72                  (setq ,var (pop .dolist-carefully.))
  73                  ,@body)
  74                (,improper-list-handler)))))
  75 \f
  76 ;;;; FIND-CLASS
  77 ;;;;
  78 ;;;; This is documented in the CLOS specification.
  79
  80 (/show "pcl/macros.lisp 119")
  81
  82 (declaim (inline legal-class-name-p))
  83 (defun legal-class-name-p (x)
  84   (symbolp x))
  85
  86 (defvar *create-classes-from-internal-structure-definitions-p* t)
  87
  88 (defun find-class-from-cell (symbol cell &optional (errorp t))
  89   (or (when cell
  90         (or (classoid-cell-pcl-class cell)
  91             (when *create-classes-from-internal-structure-definitions-p*
  92               (let ((classoid (classoid-cell-classoid cell)))
  93                 (when (and classoid
  94                            (or (condition-classoid-p classoid)
  95                                (defstruct-classoid-p classoid)))
  96                   (ensure-non-standard-class symbol classoid))))))
  97       (cond ((null errorp) nil)
  98             ((legal-class-name-p symbol)
  99              (error "There is no class named ~S." symbol))
 100             (t
 101              (error "~S is not a legal class name." symbol)))))
 102
 103 (defun find-class (symbol &optional (errorp t) environment)
 104   (declare (ignore environment))
 105   (find-class-from-cell symbol
 106                         (find-classoid-cell symbol)
 107                         errorp))
 108
 109 \f
 110 ;;; This DEFVAR was originally in defs.lisp, now moved here.
 111 ;;;
 112 ;;; Possible values are NIL, EARLY, BRAID, or COMPLETE.
 113 ;;;
 114 ;;; KLUDGE: This should probably become
 115 ;;;   (DECLAIM (TYPE (MEMBER NIL :EARLY :BRAID :COMPLETE) *BOOT-STATE*))
 116 (defvar *boot-state* nil)
 117
 118 (/show "pcl/macros.lisp 187")
 119
 120 (define-compiler-macro find-class (&whole form
 121                                    symbol &optional (errorp t) environment)
 122   (declare (ignore environment))
 123   (if (and (constantp symbol)
 124            (legal-class-name-p (setf symbol (constant-form-value symbol)))
 125            (constantp errorp)
 126            (member *boot-state* '(braid complete)))
 127       (let ((errorp (not (null (constant-form-value errorp))))
 128             (cell (make-symbol "CLASSOID-CELL")))
 129         `(let ((,cell (load-time-value (find-classoid-cell ',symbol :create t))))
 130            (or (classoid-cell-pcl-class ,cell)
 131                ,(if errorp
 132                     `(find-class-from-cell ',symbol ,cell t)
 133                     `(when (classoid-cell-classoid ,cell)
 134                        (find-class-from-cell ',symbol ,cell nil))))))
 135       form))
 136
 137 (declaim (inline class-classoid))
 138 (defun class-classoid (class)
 139   (layout-classoid (class-wrapper class)))
 140
 141 (defun (setf find-class) (new-value name &optional errorp environment)
 142   (declare (ignore errorp environment))
 143   (cond ((legal-class-name-p name)
 144          (with-single-package-locked-error
 145              (:symbol name "Using ~A as the class-name argument in ~
 146                            (SETF FIND-CLASS)"))
 147          (let ((cell (find-classoid-cell name :create new-value)))
 148            (cond (new-value
 149                   (setf (classoid-cell-pcl-class cell) new-value)
 150                   (when (eq *boot-state* 'complete)
 151                     (let ((classoid (class-classoid new-value)))
 152                       (setf (find-classoid name) classoid)
 153                       (set-class-type-translation new-value classoid))))
 154                  (cell
 155                   (clear-classoid name cell)))
 156            (when (or (eq *boot-state* 'complete)
 157                      (eq *boot-state* 'braid))
 158              (update-ctors 'setf-find-class :class new-value :name name))
 159            new-value))
 160         (t
 161          (error "~S is not a legal class name." name))))
 162
 163 (/show "pcl/macros.lisp 241")
 164
 165 (defmacro function-funcall (form &rest args)
 166   `(funcall (the function ,form) ,@args))
 167
 168 (defmacro function-apply (form &rest args)
 169   `(apply (the function ,form) ,@args))
 170
 171 (/show "pcl/macros.lisp 249")
 172 \f
 173 (defun get-setf-fun-name (name)
 174   `(setf ,name))
 175
 176 (defsetf slot-value set-slot-value)
 177 \f
 178 (/show "finished with pcl/macros.lisp")