1 ;;;; some basic PRINT-OBJECT functionality
3 ;;;; This software is part of the SBCL system. See the README file for
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
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:
16 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
17 ;;;; All rights reserved.
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
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
30 ;;;; the PRINT-OBJECT generic function
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
)
50 (pprint-logical-block (stream nil
)
51 (print-unreadable-object (x stream
:type t
:identity t
)))
52 (print-unreadable-object (x stream
:type t
:identity t
)))))
53 (/show0
"done replacing placeholder PRINT-OBJECT with DEFGENERIC")
55 ;;;; a hook called by the printer to take care of dispatching to PRINT-OBJECT
56 ;;;; for appropriate FUNCALLABLE-INSTANCE objects
58 ;;; Now that CLOS is working, we can replace our old temporary placeholder code
59 ;;; for writing funcallable instances with permanent code:
60 (fmakunbound 'sb-impl
::printed-as-funcallable-standard-class
)
61 (defun sb-impl::printed-as-funcallable-standard-class
(object stream
)
62 (when (funcallable-standard-class-p (class-of object
))
63 (print-object object stream
)
66 ;;;; PRINT-OBJECT methods for objects from PCL classes
68 ;;;; FIXME: Perhaps these should be moved back alongside the definitions of
69 ;;;; the classes they print. (Bootstrapping problems could be avoided by
70 ;;;; using DEF!METHOD to do this.)
72 (defmethod print-object ((method standard-method
) stream
)
73 (if (slot-boundp method
'%generic-function
)
74 (print-unreadable-object (method stream
:type t
:identity t
)
75 (let ((generic-function (method-generic-function method
))
77 (format stream
"~:[~*~;~/sb-impl::print-symbol-with-prefix/ ~]~{~S ~}~:S"
80 (generic-function-name generic-function
))
81 (method-qualifiers method
)
83 (unparse-specializers generic-function
(method-specializers method
))
84 (method-specializers method
)))))
87 (defmethod print-object ((method standard-accessor-method
) stream
)
88 (if (slot-boundp method
'%generic-function
)
89 (print-unreadable-object (method stream
:type t
:identity t
)
90 (let ((generic-function (method-generic-function method
)))
91 (format stream
"~/sb-impl::print-symbol-with-prefix/, slot:~S, ~:S"
93 (generic-function-name generic-function
))
94 (accessor-method-slot-name method
)
96 (unparse-specializers generic-function
(method-specializers method
))
97 (method-specializers method
)))))
100 (defmethod print-object ((mc standard-method-combination
) stream
)
101 (print-unreadable-object (mc stream
:type t
:identity t
)
104 (slot-value-or-default mc
'type-name
)
105 (slot-value-or-default mc
'options
))))
107 (defun named-object-print-function (instance stream
108 &optional
(properly-named-p t
)
110 (cond ((slot-boundp instance
'name
) ; case (1): named
111 (let ((name (slot-value instance
'name
)))
112 (print-unreadable-object
113 (instance stream
:type t
:identity
(not properly-named-p
))
114 (format stream
"~/sb-impl::print-symbol-with-prefix/~:[~:; ~:S~]"
115 name extra-p extra
))))
116 ((not extra-p
) ; case (2): empty body to avoid an extra space
117 (print-unreadable-object (instance stream
:type t
:identity t
)))
118 (t ; case (3). no name, but extra data - show #<unbound slot> and data
119 (print-unreadable-object (instance stream
:type t
:identity t
)
120 (format stream
"~S ~:S" *unbound-slot-value-marker
* extra
)))))
122 (defmethod print-object ((class class
) stream
)
123 ;; Use a similar concept as in OUTPUT-FUN.
124 (if (slot-boundp class
'name
)
125 (let* ((name (class-name class
))
126 (proper-p (and (symbolp name
) (eq (find-class name nil
) class
))))
127 (print-unreadable-object (class stream
:type t
:identity
(not proper-p
))
128 (print-symbol-with-prefix stream name
)))
129 ;; "#<CLASS #<unbound slot> {122D1141}>" is ugly. Don't show that.
130 (print-unreadable-object (class stream
:type t
:identity t
))))
132 (defmethod print-object ((slotd slot-definition
) stream
)
133 (named-object-print-function slotd stream
))
135 (defmethod print-object ((generic-function standard-generic-function
) stream
)
136 (multiple-value-call 'named-object-print-function
139 (and (slot-boundp generic-function
'name
)
140 (let ((name (slot-value generic-function
'name
)))
141 (and (legal-fun-name-p name
)
143 (eq (fdefinition name
) generic-function
))))
144 (if (slot-boundp generic-function
'methods
)
145 (list (length (generic-function-methods generic-function
)))
148 (defmethod print-object ((cache cache
) stream
)
149 (print-unreadable-object (cache stream
:type t
:identity t
)
150 (multiple-value-bind (lines-used lines-total max-depth depth-limit
)
151 (cache-statistics cache
)
153 "~D key~P, ~:[no value~;value~], ~D/~D lines, depth ~D/~D"
154 (cache-key-count cache
)
155 (cache-key-count cache
)
162 (defmethod print-object ((dfun-info dfun-info
) stream
)
163 (declare (type stream stream
))
164 (print-unreadable-object (dfun-info stream
:type t
:identity t
)))
166 (defmethod print-object ((ctor ctor
) stream
)
167 (print-unreadable-object (ctor stream
:type t
)
168 (format stream
"~S ~:S" (ctor-class-or-name ctor
) (ctor-initargs ctor
)))
171 (defmethod print-object ((obj class-precedence-description
) stream
)
172 (print-unreadable-object (obj stream
:type t
)
173 (format stream
"~D" (cpd-count obj
))))
175 (defmethod print-object ((self eql-specializer
) stream
)
176 (let ((have-obj (slot-boundp self
'object
)))
177 (print-unreadable-object (self stream
:type t
:identity
(not have-obj
))
179 (write (slot-value self
'object
) :stream stream
)))))