src/pcl/print-object.lisp

   1 ;;;; some basic PRINT-OBJECT functionality
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5
   6 ;;;; This software is derived from software originally released by Xerox
   7 ;;;; Corporation. Copyright and release statements follow. Later modifications
   8 ;;;; to the software are in the public domain and are provided with
   9 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
  10 ;;;; information.
  11
  12 ;;;; Some of the text in this file was originally taken from various files of
  13 ;;;; the PCL system from Xerox Corporation, which carried the following
  14 ;;;; copyright information:
  15 ;;;;
  16 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
  17 ;;;; All rights reserved.
  18 ;;;;
  19 ;;;; Use and copying of this software and preparation of derivative works based
  20 ;;;; upon this software are permitted. Any distribution of this software or
  21 ;;;; derivative works must comply with all applicable United States export
  22 ;;;; control laws.
  23 ;;;;
  24 ;;;; This software is made available AS IS, and Xerox Corporation makes no
  25 ;;;; warranty about the software, its performance or its conformity to any
  26 ;;;; specification.
  27
  28 (in-package "SB-PCL")
  29 \f
  30 ;;;; the PRINT-OBJECT generic function
  31
  32 ;;; Blow away the old non-generic function placeholder which was used
  33 ;;; by the printer doing bootstrapping, and immediately replace it
  34 ;;; with some new printing logic, so that the Lisp printer stays
  35 ;;; crippled only for the shortest necessary time.
  36 (/show0 "about to replace placeholder PRINT-OBJECT with DEFGENERIC")
  37 (let (;; (If we don't suppress /SHOW printing while the printer is
  38       ;; crippled here, it becomes really easy to crash the bootstrap
  39       ;; sequence by adding /SHOW statements e.g. to the compiler,
  40       ;; which kinda defeats the purpose of /SHOW being a harmless
  41       ;; tracing-style statement.)
  42       #+sb-show (*/show* nil)
  43       ;; (another workaround for the problem of debugging while the
  44       ;; printer is disabled here)
  45       (sb-impl::*print-object-is-disabled-p* t))
  46   (fmakunbound 'print-object)
  47   (defgeneric print-object (object stream))
  48   (defmethod print-object ((x t) stream)
  49     (print-unreadable-object (x stream :type t :identity t))))
  50 (/show0 "done replacing placeholder PRINT-OBJECT with DEFGENERIC")
  51 \f
  52 ;;;; a hook called by the printer to take care of dispatching to PRINT-OBJECT
  53 ;;;; for appropriate FUNCALLABLE-INSTANCE objects
  54
  55 ;;; Now that CLOS is working, we can replace our old temporary placeholder code
  56 ;;; for writing funcallable instances with permanent code:
  57 (defun sb-impl::printed-as-funcallable-standard-class (object stream)
  58   (when (funcallable-standard-class-p (class-of object))
  59     (print-object object stream)
  60     t))
  61 \f
  62 ;;;; PRINT-OBJECT methods for objects from PCL classes
  63 ;;;;
  64 ;;;; FIXME: Perhaps these should be moved back alongside the definitions of
  65 ;;;; the classes they print. (Bootstrapping problems could be avoided by
  66 ;;;; using DEF!METHOD to do this.)
  67
  68 (defmethod print-object ((method standard-method) stream)
  69   (print-unreadable-object (method stream :type t :identity t)
  70     (if (slot-boundp method 'generic-function)
  71         (let ((generic-function (method-generic-function method)))
  72           (format stream "~S ~{~S ~}~:S"
  73                   (and generic-function
  74                        (generic-function-name generic-function))
  75                   (method-qualifiers method)
  76                   (unparse-specializers method)))
  77         ;; FIXME: Why do we do CALL-NEXT-METHOD in this method (and
  78         ;; in the PRINT-OBJECT STANDARD-ACCESSOR-METHOD method too)?
  79         (call-next-method))))
  80
  81 (defmethod print-object ((method standard-accessor-method) stream)
  82   (print-unreadable-object (method stream :type t :identity t)
  83     (if (slot-boundp method 'generic-function)
  84         (let ((generic-function (method-generic-function method)))
  85           (format stream "~S, slot:~S, ~:S"
  86                   (and generic-function
  87                        (generic-function-name generic-function))
  88                   (accessor-method-slot-name method)
  89                   (unparse-specializers method)))
  90         (call-next-method))))
  91
  92 (defmethod print-object ((mc standard-method-combination) stream)
  93   (print-unreadable-object (mc stream :type t :identity t)
  94     (format stream
  95             "~S ~S"
  96             (slot-value-or-default mc 'type)
  97             (slot-value-or-default mc 'options))))
  98
  99 (defun named-object-print-function (instance stream
 100                                     &optional (extra nil extra-p))
 101   (print-unreadable-object (instance stream :type t)
 102     (if extra-p
 103         (format stream
 104                 "~S ~:S"
 105                 (slot-value-or-default instance 'name)
 106                 extra)
 107         (format stream
 108                 "~S"
 109                 (slot-value-or-default instance 'name)))))
 110
 111 (defmethod print-object ((class class) stream)
 112   (named-object-print-function class stream))
 113
 114 (defmethod print-object ((slotd slot-definition) stream)
 115   (named-object-print-function slotd stream))
 116
 117 (defmethod print-object ((generic-function standard-generic-function) stream)
 118   (named-object-print-function
 119     generic-function
 120     stream
 121     (if (slot-boundp generic-function 'methods)
 122         (list (length (generic-function-methods generic-function)))
 123         "?")))
 124
 125 (defmethod print-object ((cache cache) stream)
 126   (print-unreadable-object (cache stream :type t :identity t)
 127     (format stream
 128             "~W ~S ~W"
 129             (cache-nkeys cache)
 130             (cache-valuep cache)
 131             (cache-nlines cache))))
 132
 133 (defmethod print-object ((wrapper wrapper) stream)
 134   (print-unreadable-object (wrapper stream :type t :identity t)
 135     (prin1 (wrapper-class wrapper) stream)))
 136
 137 (defmethod print-object ((dfun-info dfun-info) stream)
 138   (declare (type stream stream))
 139   (print-unreadable-object (dfun-info stream :type t :identity t)))