unsafely-flushable
;; may be moved with impunity. Has no side effects except possibly
;; consing, and is affected only by its arguments.
+ ;;
+ ;; Since it is not used now, its distribution in fndb.lisp is
+ ;; mere random; use with caution.
movable
;; The function is a true predicate likely to be open-coded. Convert
;; any non-conditional uses into (IF <pred> T NIL). Not usually
;;; only be done when the result value is that argument.
(defun result-type-first-arg (call)
(declare (type combination call))
- (let ((cont (first (combination-args call))))
- (when cont (continuation-type cont))))
+ (let ((lvar (first (combination-args call))))
+ (when lvar (lvar-type lvar))))
(defun result-type-last-arg (call)
(declare (type combination call))
- (let ((cont (car (last (combination-args call)))))
- (when cont (continuation-type cont))))
+ (let ((lvar (car (last (combination-args call)))))
+ (when lvar (lvar-type lvar))))
;;; Derive the result type according to the float contagion rules, but
;;; always return a float. This is used for irrational functions that
(defun result-type-float-contagion (call)
(declare (type combination call))
(reduce #'numeric-contagion (combination-args call)
- :key #'continuation-type
+ :key #'lvar-type
:initial-value (specifier-type 'single-float)))
;;; Return a closure usable as a derive-type method for accessing the
(defun sequence-result-nth-arg (n)
(lambda (call)
(declare (type combination call))
- (let ((cont (nth (1- n) (combination-args call))))
- (when cont
- (let ((type (continuation-type cont)))
+ (let ((lvar (nth (1- n) (combination-args call))))
+ (when lvar
+ (let ((type (lvar-type lvar)))
(if (array-type-p type)
(specifier-type
`(vector ,(type-specifier (array-type-element-type type))))
(when (csubtypep type ltype)
ltype))))))))
-;;; Derive the type to be the type specifier which is the N'th arg.
+;;; Derive the type to be the type specifier which is the Nth arg.
(defun result-type-specifier-nth-arg (n)
(lambda (call)
(declare (type combination call))
- (let ((cont (nth (1- n) (combination-args call))))
- (when (and cont (constant-continuation-p cont))
- (careful-specifier-type (continuation-value cont))))))
+ (let ((lvar (nth (1- n) (combination-args call))))
+ (when (and lvar (constant-lvar-p lvar))
+ (careful-specifier-type (lvar-value lvar))))))
+
+;;; Derive the type to be the type specifier which is the Nth arg,
+;;; with the additional restriptions noted in the CLHS for STRING and
+;;; SIMPLE-STRING, defined to specialize on CHARACTER, and for VECTOR
+;;; (under the page for MAKE-SEQUENCE).
+(defun creation-result-type-specifier-nth-arg (n)
+ (lambda (call)
+ (declare (type combination call))
+ (let ((lvar (nth (1- n) (combination-args call))))
+ (when (and lvar (constant-lvar-p lvar))
+ (let* ((specifier (lvar-value lvar))
+ (lspecifier (if (atom specifier) (list specifier) specifier)))
+ (cond
+ ((eq (car lspecifier) 'string)
+ (destructuring-bind (string &rest size)
+ lspecifier
+ (declare (ignore string))
+ (careful-specifier-type
+ `(vector character ,@(when size size)))))
+ ((eq (car lspecifier) 'simple-string)
+ (destructuring-bind (simple-string &rest size)
+ lspecifier
+ (declare (ignore simple-string))
+ (careful-specifier-type
+ `(simple-array character ,@(if size (list size) '((*)))))))
+ (t
+ (let ((ctype (careful-specifier-type specifier)))
+ (if (and (array-type-p ctype)
+ (eq (array-type-specialized-element-type ctype)
+ *wild-type*))
+ ;; I don't think I'm allowed to modify what I get
+ ;; back from SPECIFIER-TYPE; it is, after all,
+ ;; cached. Better copy it, then.
+ (let ((real-ctype (copy-structure ctype)))
+ (setf (array-type-element-type real-ctype)
+ *universal-type*
+ (array-type-specialized-element-type real-ctype)
+ *universal-type*)
+ real-ctype)
+ ctype)))))))))
(/show0 "knownfun.lisp end of file")