1 ;;;; some macros and constants that are object-format-specific or are
2 ;;;; used for defining the object format
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
15 ;;;; other miscellaneous stuff
17 ;;; This returns a form that returns a dual-word aligned number of bytes when
18 ;;; given a number of words.
20 ;;; FIXME: should be a function
21 ;;; FIXME: should be called PAD-DATA-BLOCK-SIZE
22 (defmacro pad-data-block (words)
23 `(logandc2 (+ (ash ,words word-shift) lowtag-mask) lowtag-mask))
25 ;;;; primitive object definition stuff
27 (defun remove-keywords (options keywords)
28 (cond ((null options) nil)
29 ((member (car options) keywords)
30 (remove-keywords (cddr options) keywords))
32 (list* (car options) (cadr options)
33 (remove-keywords (cddr options) keywords)))))
35 (def!struct (prim-object-slot
36 (:constructor make-slot (name docs rest-p offset length options))
37 (:make-load-form-fun just-dump-it-normally)
39 (name nil :type symbol)
40 (docs nil :type (or null simple-string))
41 (rest-p nil :type (member t nil))
42 (offset 0 :type fixnum)
43 (length 1 :type fixnum)
44 (options nil :type list))
46 (def!struct (primitive-object (:make-load-form-fun just-dump-it-normally))
47 (name nil :type symbol)
48 (widetag nil :type symbol)
49 (lowtag nil :type symbol)
50 (options nil :type list)
51 (slots nil :type list)
53 (variable-length-p nil :type (member t nil)))
55 (defvar *primitive-objects* nil)
57 (defun %define-primitive-object (primobj)
58 (let ((name (primitive-object-name primobj)))
59 (setf *primitive-objects*
61 (remove name *primitive-objects*
62 :key #'primitive-object-name :test #'eq)))
65 (defmacro define-primitive-object
66 ((name &key lowtag widetag alloc-trans (type t))
68 (collect ((slots) (exports) (constants) (forms) (inits))
69 (let ((offset (if widetag 1 0))
70 (variable-length-p nil))
71 (dolist (spec slot-specs)
72 (when variable-length-p
73 (error "No more slots can follow a :rest-p slot."))
75 (slot-name &rest options
76 &key docs rest-p (length (if rest-p 0 1))
77 ((:type slot-type) t) init
78 (ref-known nil ref-known-p) ref-trans
79 (set-known nil set-known-p) set-trans
81 (if (atom spec) (list spec) spec)
82 (slots (make-slot slot-name docs rest-p offset length
83 (remove-keywords options
84 '(:docs :rest-p :length))))
85 (let ((offset-sym (symbolicate name "-" slot-name
86 (if rest-p "-OFFSET" "-SLOT"))))
87 (constants `(def!constant ,offset-sym ,offset
88 ,@(when docs (list docs))))
92 (forms `(defknown ,ref-trans (,type) ,slot-type ,ref-known)))
93 (forms `(def-reffer ,ref-trans ,offset ,lowtag)))
96 (forms `(defknown ,set-trans
97 ,(if (listp set-trans)
99 (list type slot-type))
102 (forms `(def-setter ,set-trans ,offset ,lowtag)))
104 (inits (cons init offset)))
106 (setf variable-length-p t))
107 (incf offset length)))
108 (unless variable-length-p
109 (let ((size (symbolicate name "-SIZE")))
110 (constants `(def!constant ,size ,offset))
113 (forms `(def-alloc ,alloc-trans ,offset ,variable-length-p ,widetag
116 (eval-when (:compile-toplevel :load-toplevel :execute)
117 (%define-primitive-object
118 ',(make-primitive-object :name name
123 :variable-length-p variable-length-p))
127 ;;;; stuff for defining reffers and setters
131 (defmacro def-reffer (name offset lowtag)
132 `(%def-reffer ',name ,offset ,lowtag))
133 (defmacro def-setter (name offset lowtag)
134 `(%def-setter ',name ,offset ,lowtag))
135 (defmacro def-alloc (name words variable-length-p header lowtag inits)
136 `(%def-alloc ',name ,words ,variable-length-p ,header ,lowtag ,inits))
137 ;;; KLUDGE: The %DEF-FOO functions used to implement the macros here
138 ;;; are defined later in another file, since they use structure slot
139 ;;; setters defined later, and we can't have physical forward
140 ;;; references to structure slot setters because ANSI in its wisdom
141 ;;; allows the xc host CL to implement structure slot setters as SETF
142 ;;; expanders instead of SETF functions. -- WHN 2002-02-09
144 ;;;; some general constant definitions
146 ;;; FIXME: SC-NUMBER-LIMIT should probably be exported from SB!C
147 ;;; or SB!VM so that we don't need to do this extra IN-PACKAGE.
150 ;;; the maximum number of SCs in any implementation
151 (def!constant sc-number-limit 32)
153 ;;; Modular functions
155 ;;; hash: name -> { ({(width . fun)}*) | :good }
156 (defvar *modular-funs*
157 (make-hash-table :test 'eq))
159 ;;; List of increasing widths
160 (defvar *modular-funs-widths* nil)
161 (defstruct modular-fun-info
162 (name (missing-arg) :type symbol)
163 (width (missing-arg) :type (integer 0))
164 (lambda-list (missing-arg) :type list)
165 (prototype (missing-arg) :type symbol))
167 (defun find-modular-version (fun-name width)
168 (let ((infos (gethash fun-name *modular-funs*)))
171 (find-if (lambda (item-width) (>= item-width width))
173 :key #'modular-fun-info-width))))
175 (defun %define-modular-fun (name lambda-list prototype width)
176 (let* ((infos (the list (gethash prototype *modular-funs*)))
177 (info (find-if (lambda (item-width) (= item-width width))
179 :key #'modular-fun-info-width)))
181 (unless (and (eq name (modular-fun-info-name info))
182 (= (length lambda-list)
183 (length (modular-fun-info-lambda-list info))))
184 (setf (modular-fun-info-name info) name)
185 (style-warn "Redefining modular version ~S of ~S for width ~S."
186 name prototype width))
187 (setf (gethash prototype *modular-funs*)
189 (list (make-modular-fun-info :name name
191 :lambda-list lambda-list
192 :prototype prototype))
194 #'< :key #'modular-fun-info-width))))
195 (setq *modular-funs-widths*
196 (merge 'list (list width) *modular-funs-widths* #'<)))
198 (defmacro define-modular-fun (name lambda-list prototype width)
199 (check-type name symbol)
200 (check-type prototype symbol)
201 (check-type width unsigned-byte)
202 (dolist (arg lambda-list)
203 (when (member arg lambda-list-keywords)
204 (error "Lambda list keyword ~S is not supported for ~
205 modular function lambda lists." arg)))
207 (%define-modular-fun ',name ',lambda-list ',prototype ,width)
208 (defknown ,name ,(mapcar (constantly 'integer) lambda-list)
209 (unsigned-byte ,width)
210 (foldable flushable movable))))
212 (defun %define-good-modular-fun (name)
213 (setf (gethash name *modular-funs*) :good)
216 (defmacro define-good-modular-fun (name)
217 (check-type name symbol)
218 `(%define-good-modular-fun ',name))