(in-package "SB!EXT")
-(file-comment
- "$Header$")
+;;; something not EQ to anything we might legitimately READ
+(defparameter *eof-object* (make-symbol "EOF-OBJECT"))
+
+;;; a type used for indexing into arrays, and for related quantities
+;;; like lengths of lists
+;;;
+;;; It's intentionally limited to one less than the
+;;; ARRAY-DIMENSION-LIMIT for efficiency reasons, because in SBCL
+;;; ARRAY-DIMENSION-LIMIT is MOST-POSITIVE-FIXNUM, and staying below
+;;; that lets the system know it can increment a value of this type
+;;; without having to worry about using a bignum to represent the
+;;; result.
+;;;
+;;; (It should be safe to use ARRAY-DIMENSION-LIMIT as an exclusive
+;;; bound because ANSI specifies it as an exclusive bound.)
+(def!type index () `(integer 0 (,sb!xc:array-dimension-limit)))
;;; the default value used for initializing character data. The ANSI
;;; spec says this is arbitrary. CMU CL used #\NULL, which we avoid
(defconstant escape-char-code 27)
(defconstant rubout-char-code 127)
\f
-;;; Concatenate together the names of some strings and symbols,
-;;; producing a symbol in the current package.
-(eval-when (:compile-toplevel :load-toplevel :execute)
- (declaim (ftype (function (&rest (or string symbol)) symbol) symbolicate))
- (defun symbolicate (&rest things)
- (values (intern (apply #'concatenate
- 'string
- (mapcar #'string things))))))
-
-;;; like SYMBOLICATE, but producing keywords
-(defun keywordicate (&rest things)
- (let ((*package* *keyword-package*))
- (apply #'symbolicate things)))
-\f
;;;; miscellaneous iteration extensions
(defmacro dovector ((elt vector &optional result) &rest forms)
(let ((fun-name (symbolicate name "-CACHE-CLEAR")))
(forms
`(defun ,fun-name ()
+ (/show0 ,(concatenate 'string "entering " (string fun-name)))
(do ((,n-index ,(- total-size entry-size) (- ,n-index ,entry-size))
(,n-cache ,var-name))
((minusp ,n-index))
`(setf (svref ,n-cache ,i) ,val))
(values-indices)
default-values))
+ (/show0 ,(concatenate 'string "leaving " (string fun-name)))
(values)))
(forms `(,fun-name)))
(error "not legal as a function name: ~S" function-name))))
;;; Is X a (possibly-improper) list of at least N elements?
+(declaim (ftype (function (t index)) list-of-length-at-least-p))
(defun list-of-length-at-least-p (x n)
- (declare (type (and unsigned-byte fixnum) n))
(or (zerop n) ; since anything can be considered an improper list of length 0
(and (consp x)
(list-of-length-at-least-p (cdr x) (1- n)))))
+
+;;; Return a list of N gensyms. (This is a common suboperation in
+;;; macros and other code-manipulating code.)
+(declaim (ftype (function (index) list) make-gensym-list))
+(defun make-gensym-list (n)
+ (loop repeat n collect (gensym)))
+
+;;; ANSI guarantees that some symbols are self-evaluating. This
+;;; function is to be called just before a change which would affect
+;;; that. (We don't absolutely have to call this function before such
+;;; changes, since such changes are given as undefined behavior. In
+;;; particular, we don't if the runtime cost would be annoying. But
+;;; otherwise it's nice to do so.)
+(defun about-to-modify (symbol)
+ (declare (type symbol symbol))
+ (cond ((eq symbol t)
+ (error "Veritas aeterna. (can't change T)"))
+ ((eq symbol nil)
+ (error "Nihil ex nihil. (can't change NIL)"))
+ ((keywordp symbol)
+ (error "Keyword values can't be changed."))
+ ;; (Just because a value is CONSTANTP is not a good enough
+ ;; reason to complain here, because we want DEFCONSTANT to
+ ;; be able to use this function, and it's legal to DEFCONSTANT
+ ;; a constant as long as the new value is EQL to the old
+ ;; value.)
+ ))
\f
#|
;;; REMOVEME when done testing byte cross-compiler
projects / sbcl.git / blobdiff