X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fearly-extensions.lisp;h=0612180ca483b9d0085c5e0c6f0fdc1ea85e505e;hb=619189958917e80786d5bb2efa4dc38d908d2553;hp=e004f73a70d734d9e47d2ebaf661e37e9ada9288;hpb=6822034325136cde4e14773c83c3769b42721306;p=sbcl.git

diff --git a/src/code/early-extensions.lisp b/src/code/early-extensions.lisp
index e004f73..0612180 100644
--- a/src/code/early-extensions.lisp
+++ b/src/code/early-extensions.lisp
@@ -16,6 +16,12 @@
 ;;; something not EQ to anything we might legitimately READ
 (defparameter *eof-object* (make-symbol "EOF-OBJECT"))
 
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (defconstant max-hash sb!xc:most-positive-fixnum))
+
+(def!type hash ()
+  `(integer 0 ,max-hash))
+
 ;;; a type used for indexing into arrays, and for related quantities
 ;;; like lengths of lists
 ;;;
@@ -843,9 +849,9 @@
           (unless (proper-list-of-length-p spec 2)
             (error "malformed ONCE-ONLY binding spec: ~S" spec))
           (let* ((name (first spec))
-                 (exp-temp (gensym (symbol-name name))))
+                 (exp-temp (gensym "ONCE-ONLY")))
             `(let ((,exp-temp ,(second spec))
-                   (,name (gensym "ONCE-ONLY-")))
+                   (,name (gensym ,(symbol-name name))))
                `(let ((,,name ,,exp-temp))
                   ,,(frob (rest specs) body))))))))
 
@@ -1214,6 +1220,16 @@
           (*print-length* (or (true *print-length*) 12)))
       (funcall function))))
 
+;;; Returns a list of members of LIST. Useful for dealing with circular lists.
+;;; For a dotted list returns a secondary value of T -- in which case the
+;;; primary return value does not include the dotted tail.
+(defun list-members (list)
+  (when list
+    (do ((tail (cdr list) (cdr tail))
+         (members (list (car list)) (cons (car tail) members)))
+        ((or (not (consp tail)) (eq tail list))
+         (values members (not (listp tail)))))))
+
 ;;; Default evaluator mode (interpeter / compiler)
 
 (declaim (type (member :compile #!+sb-eval :interpret) *evaluator-mode*))