src/compiler/proclaim.lisp

   1 ;;;; This file contains load-time support for declaration processing.
   2 ;;;; In CMU CL it was split off from the compiler so that the compiler
   3 ;;;; doesn't have to be in the cold load, but in SBCL the compiler is
   4 ;;;; in the cold load again, so this might not be valuable.
   5
   6 ;;;; This software is part of the SBCL system. See the README file for
   7 ;;;; more information.
   8 ;;;;
   9 ;;;; This software is derived from the CMU CL system, which was
  10 ;;;; written at Carnegie Mellon University and released into the
  11 ;;;; public domain. The software is in the public domain and is
  12 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  13 ;;;; files for more information.
  14
  15 (in-package "SB!C")
  16
  17 ;;; A list of UNDEFINED-WARNING structures representing references to unknown
  18 ;;; stuff which came up in a compilation unit.
  19 (defvar *undefined-warnings*)
  20 (declaim (list *undefined-warnings*))
  21
  22 ;;; Look up some symbols in *FREE-VARS*, returning the var
  23 ;;; structures for any which exist. If any of the names aren't
  24 ;;; symbols, we complain.
  25 (declaim (ftype (function (list) list) get-old-vars))
  26 (defun get-old-vars (names)
  27   (collect ((vars))
  28     (dolist (name names (vars))
  29       (unless (symbolp name)
  30         (compiler-error "The name ~S is not a symbol." name))
  31       (let ((old (gethash name *free-vars*)))
  32         (when old (vars old))))))
  33
  34 ;;; Return a new POLICY containing the policy information represented
  35 ;;; by the optimize declaration SPEC. Any parameters not specified are
  36 ;;; defaulted from the POLICY argument.
  37 (declaim (ftype (function (list policy) policy) process-optimize-decl))
  38 (defun process-optimize-decl (spec policy)
  39   (let ((result nil))
  40     ;; Add new entries from SPEC.
  41     (dolist (q-and-v-or-just-q (cdr spec))
  42       (multiple-value-bind (quality raw-value)
  43           (if (atom q-and-v-or-just-q)
  44               (values q-and-v-or-just-q 3)
  45               (destructuring-bind (quality raw-value) q-and-v-or-just-q
  46                 (values quality raw-value)))
  47         (cond ((not (policy-quality-name-p quality))
  48                (let ((deprecation-warning (policy-quality-deprecation-warning quality spec)))
  49                  (if deprecation-warning
  50                      (compiler-warn deprecation-warning)
  51                      (compiler-warn "~@<Ignoring unknown optimization quality ~S in:~_ ~S~:>"
  52                                     quality spec))))
  53               ((not (typep raw-value 'policy-quality))
  54                (compiler-warn "~@<Ignoring bad optimization value ~S in:~_ ~S~:>"
  55                               raw-value spec))
  56               (t
  57                ;; we can't do this yet, because CLOS macros expand
  58                ;; into code containing INHIBIT-WARNINGS.
  59                #+nil
  60                (when (eql quality 'sb!ext:inhibit-warnings)
  61                  (compiler-style-warn "~S is deprecated: use ~S instead"
  62                                       quality 'sb!ext:muffle-conditions))
  63                (push (cons quality raw-value)
  64                      result)))))
  65     ;; Add any nonredundant entries from old POLICY.
  66     (dolist (old-entry policy)
  67       (unless (assq (car old-entry) result)
  68         (push old-entry result)))
  69     ;; Voila.
  70     result))
  71
  72 (declaim (ftype (function (list list) list)
  73                 process-handle-conditions-decl))
  74 (defun process-handle-conditions-decl (spec list)
  75   (let ((new (copy-alist list)))
  76     (dolist (clause (cdr spec))
  77       (destructuring-bind (typespec restart-name) clause
  78         (let ((ospec (rassoc restart-name new :test #'eq)))
  79           (if ospec
  80               (setf (car ospec)
  81                     (type-specifier
  82                      (type-union (specifier-type (car ospec))
  83                                  (specifier-type typespec))))
  84               (push (cons (type-specifier (specifier-type typespec))
  85                           restart-name)
  86                     new)))))
  87     new))
  88 (declaim (ftype (function (list list) list)
  89                 process-muffle-conditions-decl))
  90 (defun process-muffle-conditions-decl (spec list)
  91   (process-handle-conditions-decl
  92    (cons 'handle-conditions
  93          (mapcar (lambda (x) (list x 'muffle-warning)) (cdr spec)))
  94    list))
  95
  96 (declaim (ftype (function (list list) list)
  97                 process-unhandle-conditions-decl))
  98 (defun process-unhandle-conditions-decl (spec list)
  99   (let ((new (copy-alist list)))
 100     (dolist (clause (cdr spec))
 101       (destructuring-bind (typespec restart-name) clause
 102         (let ((ospec (rassoc restart-name new :test #'eq)))
 103           (if ospec
 104               (let ((type-specifier
 105                      (type-specifier
 106                       (type-intersection
 107                        (specifier-type (car ospec))
 108                        (specifier-type `(not ,typespec))))))
 109                 (if type-specifier
 110                     (setf (car ospec) type-specifier)
 111                     (setq new
 112                           (delete restart-name new :test #'eq :key #'cdr))))
 113               ;; do nothing?
 114               nil))))
 115     new))
 116 (declaim (ftype (function (list list) list)
 117                 process-unmuffle-conditions-decl))
 118 (defun process-unmuffle-conditions-decl (spec list)
 119   (process-unhandle-conditions-decl
 120    (cons 'unhandle-conditions
 121          (mapcar (lambda (x) (list x 'muffle-warning)) (cdr spec)))
 122    list))
 123
 124 (declaim (ftype (function (list list) list)
 125                 process-package-lock-decl))
 126 (defun process-package-lock-decl (spec old)
 127   (let ((decl (car spec))
 128         (list (cdr spec)))
 129     (ecase decl
 130       (disable-package-locks
 131        (union old list :test #'equal))
 132       (enable-package-locks
 133        (set-difference old list :test #'equal)))))
 134
 135 ;;; ANSI defines the declaration (FOO X Y) to be equivalent to
 136 ;;; (TYPE FOO X Y) when FOO is a type specifier. This function
 137 ;;; implements that by converting (FOO X Y) to (TYPE FOO X Y).
 138 (defun canonized-decl-spec (decl-spec)
 139   (let ((id (first decl-spec)))
 140     (let ((id-is-type (if (symbolp id)
 141                           (info :type :kind id)
 142                           ;; A cons might not be a valid type specifier,
 143                           ;; but it can't be a declaration either.
 144                           (or (consp id)
 145                               (typep id 'class))))
 146           (id-is-declared-decl (info :declaration :recognized id)))
 147       ;; FIXME: Checking ID-IS-DECLARED is probably useless these days,
 148       ;; since we refuse to use the same symbol as both a type name and
 149       ;; recognized declaration name.
 150       (cond ((and id-is-type id-is-declared-decl)
 151              (compiler-error
 152               "ambiguous declaration ~S:~%  ~
 153               ~S was declared as a DECLARATION, but is also a type name."
 154               decl-spec id))
 155             (id-is-type
 156              (cons 'type decl-spec))
 157             (t
 158              decl-spec)))))
 159
 160 (defvar *queued-proclaims*) ; initialized in !COLD-INIT-FORMS
 161
 162 (!begin-collecting-cold-init-forms)
 163 (!cold-init-forms (setf *queued-proclaims* nil))
 164 (!defun-from-collected-cold-init-forms !early-proclaim-cold-init)
 165
 166 (defun sb!xc:proclaim (raw-form)
 167   #+sb-xc (/show0 "entering PROCLAIM, RAW-FORM=..")
 168   #+sb-xc (/hexstr raw-form)
 169   (let* ((form (canonized-decl-spec raw-form))
 170          (kind (first form))
 171          (args (rest form)))
 172     (case kind
 173       (special
 174        (dolist (name args)
 175          (unless (symbolp name)
 176            (error "can't declare a non-symbol as SPECIAL: ~S" name))
 177          (with-single-package-locked-error
 178              (:symbol name "globally declaring ~A special")
 179            (about-to-modify-symbol-value name "proclaim ~S as SPECIAL")
 180            (setf (info :variable :kind name) :special))))
 181       (type
 182        (if *type-system-initialized*
 183            (let ((type (specifier-type (first args))))
 184              (dolist (name (rest args))
 185                (unless (symbolp name)
 186                  (error "can't declare TYPE of a non-symbol: ~S" name))
 187                (with-single-package-locked-error
 188                    (:symbol name "globally declaring the type of ~A"))
 189                (when (eq (info :variable :where-from name) :declared)
 190                  (let ((old-type (info :variable :type name)))
 191                    (when (type/= type old-type)
 192                      ;; FIXME: changing to TYPE-PROCLAMATION-MISMATCH
 193                      ;; broke late-proclaim.lisp.
 194                      (style-warn "The new TYPE proclamation~%  ~S~@
 195                                   for ~S does not match the old TYPE~@
 196                                   proclamation ~S"
 197                                  type name old-type))))
 198                (setf (info :variable :type name) type)
 199                (setf (info :variable :where-from name) :declared)))
 200            (push raw-form *queued-proclaims*)))
 201       (ftype
 202        (if *type-system-initialized*
 203            (let ((ctype (specifier-type (first args))))
 204              (unless (csubtypep ctype (specifier-type 'function))
 205                (error "not a function type: ~S" (first args)))
 206              (dolist (name (rest args))
 207                (with-single-package-locked-error
 208                    (:symbol name "globally declaring the ftype of ~A"))
 209                (when (eq (info :function :where-from name) :declared)
 210                  (let ((old-type (info :function :type name)))
 211                    (when (type/= ctype old-type)
 212                      ;; FIXME: changing to FTYPE-PROCLAMATION-MISMATCH
 213                      ;; broke late-proclaim.lisp.
 214                      (style-warn
 215                       "new FTYPE proclamation~@
 216                        ~S~@
 217                        for ~S does not match old FTYPE proclamation~@
 218                        ~S"
 219                       ctype name old-type))))
 220
 221                ;; Now references to this function shouldn't be warned
 222                ;; about as undefined, since even if we haven't seen a
 223                ;; definition yet, we know one is planned.
 224                ;;
 225                ;; Other consequences of we-know-you're-a-function-now
 226                ;; are appropriate too, e.g. any MACRO-FUNCTION goes away.
 227                (proclaim-as-fun-name name)
 228                (note-name-defined name :function)
 229
 230                ;; the actual type declaration
 231                (setf (info :function :type name) ctype
 232                      (info :function :where-from name) :declared)))
 233            (push raw-form *queued-proclaims*)))
 234       (freeze-type
 235        (dolist (type args)
 236          (let ((class (specifier-type type)))
 237            (when (typep class 'classoid)
 238              (setf (classoid-state class) :sealed)
 239              (let ((subclasses (classoid-subclasses class)))
 240                (when subclasses
 241                  (dohash ((subclass layout) subclasses :locked t)
 242                    (declare (ignore layout))
 243                    (setf (classoid-state subclass) :sealed))))))))
 244       (optimize
 245        (setq *policy* (process-optimize-decl form *policy*)))
 246       (muffle-conditions
 247        (setq *handled-conditions*
 248              (process-muffle-conditions-decl form *handled-conditions*)))
 249       (unmuffle-conditions
 250        (setq *handled-conditions*
 251              (process-unmuffle-conditions-decl form *handled-conditions*)))
 252       ((disable-package-locks enable-package-locks)
 253          (setq *disabled-package-locks*
 254                (process-package-lock-decl form *disabled-package-locks*)))
 255       ((inline notinline maybe-inline)
 256        (dolist (name args)
 257          (proclaim-as-fun-name name) ; since implicitly it is a function
 258          (setf (info :function :inlinep name)
 259                (ecase kind
 260                  (inline :inline)
 261                  (notinline :notinline)
 262                  (maybe-inline :maybe-inline)))))
 263       (declaration
 264        (dolist (decl args)
 265          (unless (symbolp decl)
 266            (error "In~%  ~S~%the declaration to be recognized is not a ~
 267                   symbol:~%  ~S"
 268                   form decl))
 269          (with-single-package-locked-error
 270              (:symbol decl "globally declaring ~A as a declaration proclamation"))
 271          (setf (info :declaration :recognized decl) t)))
 272       (t
 273        (unless (info :declaration :recognized kind)
 274          (compiler-warn "unrecognized declaration ~S" raw-form)))))
 275   #+sb-xc (/show0 "returning from PROCLAIM")
 276   (values))