src/compiler/generic/vm-macs.lisp

   1 ;;;; some macros and constants that are object-format-specific or are
   2 ;;;; used for defining the object format
   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 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.
  12
  13 (in-package "SB!VM")
  14 \f
  15 ;;;; other miscellaneous stuff
  16
  17 ;;; This returns a form that returns a dual-word aligned number of bytes when
  18 ;;; given a number of words.
  19 ;;;
  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))
  24 \f
  25 ;;;; primitive object definition stuff
  26
  27 (defun remove-keywords (options keywords)
  28   (cond ((null options) nil)
  29         ((member (car options) keywords)
  30          (remove-keywords (cddr options) keywords))
  31         (t
  32          (list* (car options) (cadr options)
  33                 (remove-keywords (cddr options) keywords)))))
  34
  35 (def!struct (prim-object-slot
  36              (:constructor make-slot (name docs rest-p offset options))
  37              (:make-load-form-fun just-dump-it-normally)
  38              (:conc-name slot-))
  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   (options nil :type list))
  44
  45 (def!struct (primitive-object (:make-load-form-fun just-dump-it-normally))
  46   (name nil :type symbol)
  47   (widetag nil :type symbol)
  48   (lowtag nil :type symbol)
  49   (options nil :type list)
  50   (slots nil :type list)
  51   (size 0 :type fixnum)
  52   (variable-length-p nil :type (member t nil)))
  53
  54 (defvar *primitive-objects* nil)
  55
  56 (defun %define-primitive-object (primobj)
  57   (let ((name (primitive-object-name primobj)))
  58     (setf *primitive-objects*
  59           (cons primobj
  60                 (remove name *primitive-objects*
  61                         :key #'primitive-object-name :test #'eq)))
  62     name))
  63
  64 (defmacro define-primitive-object
  65           ((name &key lowtag widetag alloc-trans (type t))
  66            &rest slot-specs)
  67   (collect ((slots) (exports) (constants) (forms) (inits))
  68     (let ((offset (if widetag 1 0))
  69           (variable-length-p nil))
  70       (dolist (spec slot-specs)
  71         (when variable-length-p
  72           (error "No more slots can follow a :rest-p slot."))
  73         (destructuring-bind
  74             (slot-name &rest options
  75                        &key docs rest-p (length (if rest-p 0 1))
  76                        ((:type slot-type) t) init
  77                        (ref-known nil ref-known-p) ref-trans
  78                        (set-known nil set-known-p) set-trans
  79                        cas-trans
  80                        &allow-other-keys)
  81             (if (atom spec) (list spec) spec)
  82           (slots (make-slot slot-name docs rest-p offset
  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))))
  89             (exports offset-sym))
  90           (when ref-trans
  91             (when ref-known-p
  92               (forms `(defknown ,ref-trans (,type) ,slot-type ,ref-known)))
  93             (forms `(def-reffer ,ref-trans ,offset ,lowtag)))
  94           (when set-trans
  95             (when set-known-p
  96               (forms `(defknown ,set-trans
  97                                 ,(if (listp set-trans)
  98                                      (list slot-type type)
  99                                      (list type slot-type))
 100                                 ,slot-type
 101                         ,set-known)))
 102             (forms `(def-setter ,set-trans ,offset ,lowtag)))
 103           (when cas-trans
 104             (when rest-p
 105               (error ":REST-P and :CAS-TRANS incompatible."))
 106             (forms
 107              `(progn
 108                 (defknown ,cas-trans (,type ,slot-type ,slot-type)
 109                     ,slot-type (unsafe))
 110                 #!+compare-and-swap-vops
 111                 (def-casser ,cas-trans ,offset ,lowtag))))
 112           (when init
 113             (inits (cons init offset)))
 114           (when rest-p
 115             (setf variable-length-p t))
 116           (incf offset length)))
 117       (unless variable-length-p
 118         (let ((size (symbolicate name "-SIZE")))
 119           (constants `(def!constant ,size ,offset))
 120           (exports size)))
 121       (when alloc-trans
 122         (forms `(def-alloc ,alloc-trans ,offset ,variable-length-p ,widetag
 123                            ,lowtag ',(inits))))
 124       `(progn
 125          (eval-when (:compile-toplevel :load-toplevel :execute)
 126            (%define-primitive-object
 127             ',(make-primitive-object :name name
 128                                      :widetag widetag
 129                                      :lowtag lowtag
 130                                      :slots (slots)
 131                                      :size offset
 132                                      :variable-length-p variable-length-p))
 133            ,@(constants))
 134          ,@(forms)))))
 135 \f
 136 ;;;; stuff for defining reffers and setters
 137
 138 (in-package "SB!C")
 139
 140 (defmacro def-reffer (name offset lowtag)
 141   `(%def-reffer ',name ,offset ,lowtag))
 142 (defmacro def-setter (name offset lowtag)
 143   `(%def-setter ',name ,offset ,lowtag))
 144 (defmacro def-alloc (name words variable-length-p header lowtag inits)
 145   `(%def-alloc ',name ,words ,variable-length-p ,header ,lowtag ,inits))
 146 #!+compare-and-swap-vops
 147 (defmacro def-casser (name offset lowtag)
 148   `(%def-casser ',name ,offset ,lowtag))
 149 ;;; KLUDGE: The %DEF-FOO functions used to implement the macros here
 150 ;;; are defined later in another file, since they use structure slot
 151 ;;; setters defined later, and we can't have physical forward
 152 ;;; references to structure slot setters because ANSI in its wisdom
 153 ;;; allows the xc host CL to implement structure slot setters as SETF
 154 ;;; expanders instead of SETF functions. -- WHN 2002-02-09
 155 \f
 156 ;;;; some general constant definitions
 157
 158 ;;; FIXME: SC-NUMBER-LIMIT should probably be exported from SB!C
 159 ;;; or SB!VM so that we don't need to do this extra IN-PACKAGE.
 160 (in-package "SB!C")
 161
 162 ;;; the maximum number of SCs in any implementation
 163 (def!constant sc-number-limit 32)
 164 \f
 165 ;;; Modular functions
 166
 167 ;;; For a documentation, see CUT-TO-WIDTH.
 168
 169 (defstruct modular-class
 170   ;; hash: name -> { :GOOD | optimizer | ({modular-fun-info}*)}
 171   (funs (make-hash-table :test 'eq))
 172   ;; hash: modular-variant -> (prototype width)
 173   ;;
 174   ;; FIXME: Reimplement with generic function names of kind
 175   ;; (MODULAR-VERSION prototype width)
 176   (versions (make-hash-table :test 'eq))
 177   ;; list of increasing widths
 178   (widths nil))
 179 (defvar *unsigned-modular-class* (make-modular-class))
 180 (defvar *signed-modular-class* (make-modular-class))
 181 (defun find-modular-class (kind)
 182   (ecase kind
 183     (:unsigned *unsigned-modular-class*)
 184     (:signed *signed-modular-class*)))
 185
 186 (defstruct modular-fun-info
 187   (name (missing-arg) :type symbol)
 188   (width (missing-arg) :type (integer 0))
 189   (lambda-list (missing-arg) :type list)
 190   (prototype (missing-arg) :type symbol))
 191
 192 (defun find-modular-version (fun-name class width)
 193   (let ((infos (gethash fun-name (modular-class-funs (find-modular-class class)))))
 194     (if (listp infos)
 195         (find-if (lambda (item-width) (>= item-width width))
 196                  infos
 197                  :key #'modular-fun-info-width)
 198         infos)))
 199
 200 ;;; Return (VALUES prototype-name width)
 201 (defun modular-version-info (name class)
 202   (values-list (gethash name (modular-class-versions (find-modular-class class)))))
 203
 204 (defun %define-modular-fun (name lambda-list prototype class width)
 205   (let* ((class (find-modular-class class))
 206          (funs (modular-class-funs class))
 207          (versions (modular-class-versions class))
 208          (infos (the list (gethash prototype funs)))
 209          (info (find-if (lambda (item-width) (= item-width width))
 210                         infos
 211                         :key #'modular-fun-info-width)))
 212     (if info
 213         (unless (and (eq name (modular-fun-info-name info))
 214                      (= (length lambda-list)
 215                         (length (modular-fun-info-lambda-list info))))
 216           (setf (modular-fun-info-name info) name)
 217           (style-warn "Redefining modular version ~S of ~S for width ~S."
 218                       name prototype width))
 219         (setf (gethash prototype funs)
 220               (merge 'list
 221                      (list (make-modular-fun-info :name name
 222                                                   :width width
 223                                                   :lambda-list lambda-list
 224                                                   :prototype prototype))
 225                      infos
 226                      #'< :key #'modular-fun-info-width)
 227               (gethash name versions)
 228               (list prototype width)))
 229     (setf (modular-class-widths class)
 230           (merge 'list (list width) (modular-class-widths class) #'<))))
 231
 232 (defmacro define-modular-fun (name lambda-list prototype class width)
 233   (check-type name symbol)
 234   (check-type prototype symbol)
 235   (check-type class (member :unsigned :signed))
 236   (check-type width unsigned-byte)
 237   (dolist (arg lambda-list)
 238     (when (member arg lambda-list-keywords)
 239       (error "Lambda list keyword ~S is not supported for ~
 240               modular function lambda lists." arg)))
 241   `(progn
 242      (%define-modular-fun ',name ',lambda-list ',prototype ',class ,width)
 243      (defknown ,name ,(mapcar (constantly 'integer) lambda-list)
 244                (,(ecase class
 245                    (:unsigned 'unsigned-byte)
 246                    (:signed 'signed-byte))
 247                  ,width)
 248                (foldable flushable movable)
 249                :derive-type (make-modular-fun-type-deriver
 250                              ',prototype ',class ,width))))
 251
 252 (defun %define-good-modular-fun (name class)
 253   (setf (gethash name (modular-class-funs (find-modular-class class))) :good)
 254   name)
 255
 256 (defmacro define-good-modular-fun (name class)
 257   (check-type name symbol)
 258   (check-type class (member :unsigned :signed))
 259   `(%define-good-modular-fun ',name ',class))
 260
 261 (defmacro define-modular-fun-optimizer
 262     (name ((&rest lambda-list) class &key (width (gensym "WIDTH")))
 263      &body body)
 264   (check-type name symbol)
 265   (check-type class (member :unsigned :signed))
 266   (dolist (arg lambda-list)
 267     (when (member arg lambda-list-keywords)
 268       (error "Lambda list keyword ~S is not supported for ~
 269               modular function lambda lists." arg)))
 270   (with-unique-names (call args)
 271     `(setf (gethash ',name (modular-class-funs (find-modular-class ',class)))
 272            (lambda (,call ,width)
 273              (declare (type basic-combination ,call)
 274                       (type (integer 0) width))
 275              (let ((,args (basic-combination-args ,call)))
 276                (when (= (length ,args) ,(length lambda-list))
 277                  (destructuring-bind ,lambda-list ,args
 278                    (declare (type lvar ,@lambda-list))
 279                    ,@body)))))))