-;;;; utility functions needed by the back end to generate code
+;;;; utility functions and macros needed by the back end to generate
+;;;; code
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
\f
;;; Make a fixnum out of NUM. (I.e. shift by two bits if it will fit.)
(defun fixnumize (num)
- (if (<= #x-20000000 num #x1fffffff)
- (ash num 2)
- (error "~D is too big for a fixnum." num)))
+ (if (fixnump num)
+ (ash num (1- n-lowtag-bits))
+ (error "~W is too big for a fixnum." num)))
\f
;;;; routines for dealing with static symbols
(defun static-symbol-offset (symbol)
(if symbol
(let ((posn (position symbol *static-symbols*)))
- (unless posn (error "~S is not a static symbol." symbol))
- (+ (* posn (pad-data-block symbol-size))
- (pad-data-block (1- symbol-size))
- other-pointer-lowtag
- (- list-pointer-lowtag)))
+ (unless posn (error "~S is not a static symbol." symbol))
+ (+ (* posn (pad-data-block symbol-size))
+ (pad-data-block (1- symbol-size))
+ other-pointer-lowtag
+ (- list-pointer-lowtag)))
0))
;;; Given a byte offset, OFFSET, return the appropriate static symbol.
(if (zerop offset)
nil
(multiple-value-bind (n rem)
- (truncate (+ offset list-pointer-lowtag (- other-pointer-lowtag)
- (- (pad-data-block (1- symbol-size))))
- (pad-data-block symbol-size))
- (unless (and (zerop rem) (<= 0 n (1- (length *static-symbols*))))
- (error "The byte offset ~D is not valid." offset))
- (elt *static-symbols* n))))
+ (truncate (+ offset list-pointer-lowtag (- other-pointer-lowtag)
+ (- (pad-data-block (1- symbol-size))))
+ (pad-data-block symbol-size))
+ (unless (and (zerop rem) (<= 0 n (1- (length *static-symbols*))))
+ (error "The byte offset ~W is not valid." offset))
+ (elt *static-symbols* n))))
;;; Return the (byte) offset from NIL to the start of the fdefn object
;;; for the static function NAME.
(defun static-fun-offset (name)
(let ((static-syms (length *static-symbols*))
- (static-fun-index (position name *static-funs*)))
+ (static-fun-index (position name *static-funs*)))
(unless static-fun-index
(error "~S isn't a static function." name))
(+ (* static-syms (pad-data-block symbol-size))
(- list-pointer-lowtag)
(* static-fun-index (pad-data-block fdefn-size))
(* fdefn-raw-addr-slot n-word-bytes))))
+\f
+;;; Various error-code generating helpers
+(defvar *adjustable-vectors* nil)
+
+(defmacro with-adjustable-vector ((var) &rest body)
+ `(let ((,var (or (pop *adjustable-vectors*)
+ (make-array 16
+ :element-type '(unsigned-byte 8)
+ :fill-pointer 0
+ :adjustable t))))
+ (declare (type (vector (unsigned-byte 8) 16) ,var))
+ (setf (fill-pointer ,var) 0)
+ (unwind-protect
+ (progn
+ ,@body)
+ (push ,var *adjustable-vectors*))))