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                (compiler-warn "ignoring unknown optimization quality ~
  49                                ~S in ~S"
  50                                quality spec))
  51               ((not (typep raw-value 'policy-quality))
  52                (compiler-warn "ignoring bad optimization value ~S in ~S"
  53                               raw-value spec))
  54               (t
  55                (push (cons quality raw-value)
  56                      result)))))
  57     ;; Add any nonredundant entries from old POLICY.
  58     (dolist (old-entry policy)
  59       (unless (assq (car old-entry) result)
  60         (push old-entry result)))
  61     ;; Voila.
  62     result))
  63
  64 ;;; ANSI defines the declaration (FOO X Y) to be equivalent to
  65 ;;; (TYPE FOO X Y) when FOO is a type specifier. This function
  66 ;;; implements that by converting (FOO X Y) to (TYPE FOO X Y).
  67 (defun canonized-decl-spec (decl-spec)
  68   (let ((id (first decl-spec)))
  69     (unless (symbolp id)
  70       (error "The declaration identifier is not a symbol: ~S" id))
  71     (let ((id-is-type (info :type :kind id))
  72           (id-is-declared-decl (info :declaration :recognized id)))
  73       (cond ((and id-is-type id-is-declared-decl)
  74              (compiler-error
  75               "ambiguous declaration ~S:~%  ~
  76               ~S was declared as a DECLARATION, but is also a type name."
  77               decl-spec id))
  78             (id-is-type
  79              (cons 'type decl-spec))
  80             (t
  81              decl-spec)))))
  82
  83 (defun sb!xc:proclaim (raw-form)
  84   #+sb-xc (/show0 "entering PROCLAIM, RAW-FORM=..")
  85   #+sb-xc (/hexstr raw-form)
  86   (let* ((form (canonized-decl-spec raw-form))
  87          (kind (first form))
  88          (args (rest form)))
  89     (case kind
  90       (special
  91        (dolist (name args)
  92          (unless (symbolp name)
  93            (error "can't declare a non-symbol as SPECIAL: ~S" name))
  94          (when (constantp name)
  95            (error "can't declare a constant as SPECIAL: ~S" name))
  96          (clear-info :variable :constant-value name)
  97          (setf (info :variable :kind name) :special)))
  98       (type
  99        (when *type-system-initialized*
 100          (let ((type (specifier-type (first args))))
 101            (dolist (name (rest args))
 102              (unless (symbolp name)
 103                (error "can't declare TYPE of a non-symbol: ~S" name))
 104              (when (eq (info :variable :where-from name) :declared)
 105                (let ((old-type (info :variable :type name)))
 106                  (when (type/= type old-type)
 107                    (style-warn "The new TYPE proclamation~%  ~S~@
 108                                for ~S does not match the old TYPE~@
 109                                proclamation ~S"
 110                                type name old-type))))
 111              (setf (info :variable :type name) type)
 112              (setf (info :variable :where-from name) :declared)))))
 113       (ftype
 114        ;; FIXME: Since currently *TYPE-SYSTEM-INITIALIZED* is not set
 115        ;; until many toplevel forms have run, this condition on
 116        ;; PROCLAIM (FTYPE ..) (and on PROCLAIM (TYPE ..), above) means
 117        ;; that valid PROCLAIMs in cold code could get lost. Probably
 118        ;; the cleanest way to deal with this would be to initialize
 119        ;; the type system completely in special cold init forms,
 120        ;; before any ordinary toplevel forms run. Failing that, we
 121        ;; could queue up PROCLAIMs to be done after the type system is
 122        ;; initialized. Failing that, we could at least issue a warning
 123        ;; when we have to ignore a PROCLAIM because the type system is
 124        ;; uninitialized.
 125        (when *type-system-initialized*
 126          (let ((ctype (specifier-type (first args))))
 127            (unless (csubtypep ctype (specifier-type 'function))
 128              (error "not a function type: ~S" (first args)))
 129            (dolist (name (rest args))
 130
 131              ;; KLUDGE: Something like the commented-out TYPE/=
 132              ;; check here would be nice, but it has been
 133              ;; commented out because TYPE/= doesn't support
 134              ;; function types. It could probably be made to do
 135              ;; so, but it might take some time, since function
 136              ;; types involve values types, which aren't
 137              ;; supported, and since the SUBTYPEP operator for
 138              ;; FUNCTION types is rather broken, e.g.
 139              ;;   (SUBTYPEP '(FUNCTION (T BOOLEAN) NIL)
 140              ;;             '(FUNCTION (FIXNUM FIXNUM) NIL)) => T, T
 141              ;; -- WHN 20000229
 142              #|
 143              (when (eq (info :function :where-from name) :declared)
 144                (let ((old-type (info :function :type name)))
 145                  (when (type/= ctype old-type)
 146                    (style-warn
 147                     "new FTYPE proclamation~@
 148                      ~S~@
 149                      for ~S does not match old FTYPE proclamation~@
 150                      ~S"
 151                     (list ctype name old-type)))))
 152              |#
 153
 154              ;; Now references to this function shouldn't be warned
 155              ;; about as undefined, since even if we haven't seen a
 156              ;; definition yet, we know one is planned.
 157              ;;
 158              ;; Other consequences of we-know-you're-a-function-now
 159              ;; are appropriate too, e.g. any MACRO-FUNCTION goes away.
 160              (proclaim-as-fun-name name)
 161              (note-name-defined name :function)
 162
 163              ;; the actual type declaration
 164              (setf (info :function :type name) ctype
 165                    (info :function :where-from name) :declared)))))
 166       (freeze-type
 167        (dolist (type args)
 168          (let ((class (specifier-type type)))
 169            (when (typep class 'sb!xc:class)
 170              (setf (class-state class) :sealed)
 171              (let ((subclasses (class-subclasses class)))
 172                (when subclasses
 173                  (dohash (subclass layout subclasses)
 174                    (declare (ignore layout))
 175                    (setf (class-state subclass) :sealed))))))))
 176       (optimize
 177        (setq *policy* (process-optimize-decl form *policy*)))
 178       ((inline notinline maybe-inline)
 179        (dolist (name args)
 180          (proclaim-as-fun-name name) ; since implicitly it is a function
 181          (setf (info :function :inlinep name)
 182                (ecase kind
 183                  (inline :inline)
 184                  (notinline :notinline)
 185                  (maybe-inline :maybe-inline)))))
 186       (declaration
 187        (dolist (decl args)
 188          (unless (symbolp decl)
 189            (error "In~%  ~S~%the declaration to be recognized is not a ~
 190                   symbol:~%  ~S"
 191                   form decl))
 192          (setf (info :declaration :recognized decl) t)))
 193       (t
 194        (unless (info :declaration :recognized kind)
 195          (compiler-warn "unrecognized declaration ~S" raw-form)))))
 196   #+sb-xc (/show0 "returning from PROCLAIM")
 197   (values))