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           ;; These nonstandard declarations seem to be used privately
  33           ;; within PCL itself to pass information around, so we can't
  34           ;; just delete them.
  35           %class
  36           ;; This declaration may also be used within PCL to pass
  37           ;; information around, I'm not sure. -- WHN 2000-12-30
  38           %variable-rebinding))
  39
  40 (/show "done with DECLAIM DECLARATION")
  41
  42 (defun get-declaration (name declarations &optional default)
  43   (dolist (d declarations default)
  44     (dolist (form (cdr d))
  45       (when (and (consp form) (eq (car form) name))
  46         (return-from get-declaration (cdr form))))))
  47
  48 (/show "pcl/macros.lisp 85")
  49
  50 (/show "pcl/macros.lisp 101")
  51
  52 (defmacro dolist-carefully ((var list improper-list-handler) &body body)
  53   `(let ((,var nil)
  54          (.dolist-carefully. ,list))
  55      (loop (when (null .dolist-carefully.) (return nil))
  56            (if (consp .dolist-carefully.)
  57                (progn
  58                  (setq ,var (pop .dolist-carefully.))
  59                  ,@body)
  60                (,improper-list-handler)))))
  61 \f
  62 ;;;; FIND-CLASS
  63 ;;;;
  64 ;;;; This is documented in the CLOS specification.
  65
  66 (/show "pcl/macros.lisp 119")
  67
  68 (declaim (inline legal-class-name-p))
  69 (defun legal-class-name-p (x)
  70   (symbolp x))
  71
  72 (defvar *create-classes-from-internal-structure-definitions-p* t)
  73
  74 (declaim (ftype function ensure-non-standard-class))
  75 (defun find-class-from-cell (symbol cell &optional (errorp t))
  76   (or (when cell
  77         (or (classoid-cell-pcl-class cell)
  78             (when *create-classes-from-internal-structure-definitions-p*
  79               (let ((classoid (classoid-cell-classoid cell)))
  80                 (when (and classoid
  81                            (or (condition-classoid-p classoid)
  82                                (defstruct-classoid-p classoid)))
  83                   (ensure-non-standard-class symbol classoid))))))
  84       (cond ((null errorp) nil)
  85             ((legal-class-name-p symbol)
  86              (error "There is no class named ~
  87                      ~/sb-impl::print-symbol-with-prefix/." symbol))
  88             (t
  89              (error "~S is not a legal class name." symbol)))))
  90
  91 (defun find-class (symbol &optional (errorp t) environment)
  92   (declare (ignore environment))
  93   (find-class-from-cell symbol
  94                         (find-classoid-cell symbol)
  95                         errorp))
  96
  97 \f
  98 ;;; This DEFVAR was originally in defs.lisp, now moved here.
  99 ;;;
 100 ;;; Possible values are NIL, EARLY, BRAID, or COMPLETE.
 101 (declaim (type (member nil early braid complete) **boot-state**))
 102 (defglobal **boot-state** nil)
 103
 104 (/show "pcl/macros.lisp 187")
 105
 106 (define-compiler-macro find-class (&whole form
 107                                    symbol &optional (errorp t) environment)
 108   (declare (ignore environment))
 109   (if (and (constantp symbol)
 110            (legal-class-name-p (setf symbol (constant-form-value symbol)))
 111            (constantp errorp)
 112            (member **boot-state** '(braid complete)))
 113       (let ((errorp (not (null (constant-form-value errorp))))
 114             (cell (make-symbol "CLASSOID-CELL")))
 115         `(let ((,cell (load-time-value (find-classoid-cell ',symbol :create t))))
 116            (or (classoid-cell-pcl-class ,cell)
 117                ,(if errorp
 118                     `(find-class-from-cell ',symbol ,cell t)
 119                     `(when (classoid-cell-classoid ,cell)
 120                        (find-class-from-cell ',symbol ,cell nil))))))
 121       form))
 122
 123 (declaim (ftype function class-wrapper))
 124 (declaim (inline class-classoid))
 125 (defun class-classoid (class)
 126   (layout-classoid (class-wrapper class)))
 127
 128 (declaim (ftype function %set-class-type-translation update-ctors))
 129 (defun (setf find-class) (new-value name &optional errorp environment)
 130   (declare (ignore errorp environment))
 131   (cond ((legal-class-name-p name)
 132          (with-single-package-locked-error
 133              (:symbol name "Using ~A as the class-name argument in ~
 134                            (SETF FIND-CLASS)"))
 135          (with-world-lock ()
 136            (let ((cell (find-classoid-cell name :create new-value)))
 137              (cond (new-value
 138                     (setf (classoid-cell-pcl-class cell) new-value)
 139                     (when (eq **boot-state** 'complete)
 140                       (let ((classoid (class-classoid new-value)))
 141                         (setf (find-classoid name) classoid)
 142                         (%set-class-type-translation new-value classoid))))
 143                    (cell
 144                     (%clear-classoid name cell)))
 145              (when (or (eq **boot-state** 'complete)
 146                        (eq **boot-state** 'braid))
 147                (update-ctors 'setf-find-class :class new-value :name name))
 148              new-value)))
 149         (t
 150          (error "~S is not a legal class name." name))))
 151
 152 (/show "pcl/macros.lisp 241")
 153
 154 (defmacro function-funcall (form &rest args)
 155   `(funcall (the function ,form) ,@args))
 156
 157 (defmacro function-apply (form &rest args)
 158   `(apply (the function ,form) ,@args))
 159
 160 (/show "pcl/macros.lisp 249")
 161 \f
 162 (defun get-setf-fun-name (name)
 163   `(setf ,name))
 164
 165 (defsetf slot-value set-slot-value)
 166 \f
 167 (/show "finished with pcl/macros.lisp")