;;; breakdown of side effects, since we do very little code motion on
;;; IR1. We are interested in some deeper semantic properties such as
;;; whether it is safe to pass stack closures to.
-(def-boolean-attribute ir1
+(!def-boolean-attribute ir1
;; may call functions that are passed as arguments. In order to
;; determine what other effects are present, we must find the
;; effects of all arguments that may be functions.
;; mark these functions as foldable in this database.
foldable
;; may be eliminated if value is unused. The function has no side
- ;; effects except possibly CONS. If a function is defined to signal
- ;; errors, then it is not flushable even if it is movable or
- ;; foldable.
+ ;; effects except possibly cons. If a function might signal errors,
+ ;; then it is not flushable even if it is movable, foldable or
+ ;; unsafely-flushable. Implies UNSAFELY-FLUSHABLE. (In safe code
+ ;; type checking of arguments is always performed by the caller, so
+ ;; a function which SHOULD signal an error if arguments are not of
+ ;; declared types may be FLUSHABLE.)
flushable
+ ;; unsafe call may be eliminated if value is unused. The function
+ ;; has no side effects except possibly cons and signalling an error
+ ;; in the safe code. If a function MUST signal errors, then it is
+ ;; not unsafely-flushable even if it is movable or foldable.
+ unsafely-flushable
;; may be moved with impunity. Has no side effects except possibly
;; consing, and is affected only by its arguments.
movable
;; The function is a true predicate likely to be open-coded. Convert
- ;; any non-conditional uses into (IF <pred> T NIL).
+ ;; any non-conditional uses into (IF <pred> T NIL). Not usually
+ ;; specified to DEFKNOWN, since this is implementation dependent,
+ ;; and is usually automatically set by the DEFINE-VOP :CONDITIONAL
+ ;; option.
predicate
;; Inhibit any warning for compiling a recursive definition.
;; (Normally the compiler warns when compiling a recursive
(predicate-type nil :type (or ctype null)))
(defprinter (fun-info)
+ (attributes :test (not (zerop attributes))
+ :prin1 (decode-ir1-attributes attributes))
(transforms :test transforms)
(derive-type :test derive-type)
(optimizer :test optimizer)
(string-equal (transform-note x) note)
(eq (transform-important x) important)))
(fun-info-transforms info))))
- (if old
- (setf (transform-function old) fun
- (transform-note old) note)
- (push (make-transform :type ctype :function fun :note note
- :important important)
- (fun-info-transforms info)))
+ (cond (old
+ (style-warn "Overwriting ~S" old)
+ (setf (transform-function old) fun
+ (transform-note old) note))
+ (t
+ (push (make-transform :type ctype :function fun :note note
+ :important important)
+ (fun-info-transforms info))))
name))
;;; Make a FUN-INFO structure with the specified type, attributes
(defun %defknown (names type attributes &key derive-type optimizer)
(let ((ctype (specifier-type type))
(info (make-fun-info :attributes attributes
- :derive-type derive-type
- :optimizer optimizer))
+ :derive-type derive-type
+ :optimizer optimizer))
(target-env *info-environment*))
(dolist (name names)
(let ((old-fun-info (info :function :info name)))
;;; shared, we copy it. We don't have to copy the lists, since each
;;; function that has generators or transforms has already been
;;; through here.
-(declaim (ftype (function (t) fun-info) fun-info-or-lose))
+(declaim (ftype (sfunction (t) fun-info) fun-info-or-lose))
(defun fun-info-or-lose (name)
(let (;; FIXME: Do we need this rebinding here? It's a literal
;; translation of the old CMU CL rebinding to
(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))
(when (and cont (constant-continuation-p cont))
(careful-specifier-type (continuation-value cont))))))
+;;; 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 ((cont (nth (1- n) (combination-args call))))
+ (when (and cont (constant-continuation-p cont))
+ (let* ((specifier (continuation-value cont))
+ (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")
projects / sbcl.git / blobdiff