0.7.8.12:

[sbcl.git] / src / compiler / generic / utils.lisp

diff --git a/src/compiler/generic/utils.lisp b/src/compiler/generic/utils.lisp
index cd08569..38fa31c 100644 (file)
--- a/src/compiler/generic/utils.lisp
+++ b/src/compiler/generic/utils.lisp
@@ -1,4 +1,5 @@
-;;;; 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.
@@ -11,12 +12,11 @@
 
 (in-package "SB!VM")
 \f
+;;; Make a fixnum out of NUM. (I.e. shift by two bits if it will fit.)
 (defun fixnumize (num)
-  #!+sb-doc
-  "Make a fixnum out of NUM. (i.e. shift by two bits if it will fit.)"
   (if (<= #x-20000000 num #x1fffffff)
       (ash num 2)
-      (error "~D is too big for a fixnum." num)))
+      (error "~W is too big for a fixnum." num)))
 \f
 ;;;; routines for dealing with static symbols
 
@@ -24,9 +24,8 @@
   (or (null symbol)
       (and (member symbol *static-symbols*) t)))
 
+;;; the byte offset of the static symbol SYMBOL
 (defun static-symbol-offset (symbol)
-  #!+sb-doc
-  "the byte offset of the static symbol SYMBOL"
   (if symbol
       (let ((posn (position symbol *static-symbols*)))
        (unless posn (error "~S is not a static symbol." symbol))
@@ -36,9 +35,8 @@
           (- list-pointer-lowtag)))
       0))
 
+;;; Given a byte offset, OFFSET, return the appropriate static symbol.
 (defun offset-static-symbol (offset)
-  #!+sb-doc
-  "Given a byte offset, OFFSET, return the appropriate static symbol."
   (if (zerop offset)
       nil
       (multiple-value-bind (n rem)
@@ -46,19 +44,34 @@
                       (- (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))
+         (error "The byte offset ~W is not valid." offset))
        (elt *static-symbols* n))))
 
-(defun static-function-offset (name)
-  #!+sb-doc
-  "Return the (byte) offset from NIL to the start of the fdefn object
-   for the static function NAME."
+;;; 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-function-index (position name *static-functions*)))
-    (unless static-function-index
+       (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))
        (pad-data-block (1- symbol-size))
        (- list-pointer-lowtag)
-       (* static-function-index (pad-data-block fdefn-size))
+       (* 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*))))