0.8.1.6:

	Fix off-by-one error in %CHECK-BOUNDS transform for known array
	dimensions

diff --git a/BUGS b/BUGS
index ca347e1..7d606d7 100644 (file)
--- a/BUGS
+++ b/BUGS
@@ -1011,7 +1011,7 @@ WORKAROUND:
   array types, there's no good way to tell it you're doing it
   intentionally so that it should shut up and just compile the code.
 
-  Another poblem is confusing error message "asserted type ARRAY
+  Another problem is confusing error message "asserted type ARRAY
   conflicts with derived type (VALUES SIMPLE-VECTOR &OPTIONAL)" during
   compiling (LAMBDA (V) (VALUES (SVREF V 0) (VECTOR-POP V))).
 
@@ -1024,6 +1024,13 @@ WORKAROUND:
 258:
   (fixed in 0.8.1.3)
 
+259:
+  (compile nil '(lambda () (aref (make-array 0) 0))) compiles without
+  warning.  Analogous cases with the index and length being equal and
+  greater than 0 are warned for; the problem here seems to be that the
+  type required for an array reference of this type is (INTEGER 0 (0))
+  which is canonicalized to NIL.
+
 DEFUNCT CATEGORIES OF BUGS
   IR1-#:
     These labels were used for bugs related to the old IR1 interpreter.

diff --git a/NEWS b/NEWS
index 240bc66..b479b76 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1885,6 +1885,9 @@ changes in sbcl-0.8.1 relative to sbcl-0.8.0:
   * fixed bugs 3cd: structure slot readers perform type check if the
     slot can have an invalid value (i.e. it is either not initialized
     or can be written with a less specific slot writer).
+  * bug fix: the compiler now traps array references to elements off
+    the end of an array; previously, the bounds checking in some
+    circumstances could go off-by-one.
 
 planned incompatible changes in 0.8.x:
   * (not done yet, but planned:) When the profiling interface settles

diff --git a/src/compiler/array-tran.lisp b/src/compiler/array-tran.lisp
index 7afe2cd..d0f9baf 100644 (file)
--- a/src/compiler/array-tran.lisp
+++ b/src/compiler/array-tran.lisp
@@ -565,7 +565,7 @@
          (give-up-ir1-transform))
         (t
          (let ((dim (continuation-value dimension)))
-           `(the (integer 0 ,dim) index)))))
+           `(the (integer 0 (,dim)) index)))))
 \f
 ;;;; WITH-ARRAY-DATA
 

diff --git a/tests/array.pure.lisp b/tests/array.pure.lisp
index 50f9987..21b5b69 100644 (file)
--- a/tests/array.pure.lisp
+++ b/tests/array.pure.lisp
@@ -116,3 +116,14 @@
   (assert (eq (array-element-type a) 'nil)))
 
 (assert (eq (upgraded-array-element-type 'nil) 'nil))
+
+(multiple-value-bind (fun warn fail)
+    (compile nil '(lambda () (aref (make-array 0) 0)))
+  #+nil (assert fail) ; doesn't work, (maybe because ASSERTED-TYPE is NIL?)
+  (assert (raises-error? (funcall fun) type-error)))
+
+(multiple-value-bind (fun warn fail)
+    (compile nil '(lambda () (aref (make-array 1) 1)))
+  (assert fail)
+  (assert (raises-error? (funcall fun) type-error)))
+

diff --git a/version.lisp-expr b/version.lisp-expr
index cee4763..455ce52 100644 (file)
--- a/version.lisp-expr
+++ b/version.lisp-expr
@@ -17,4 +17,4 @@
 ;;; checkins which aren't released. (And occasionally for internal
 ;;; versions, especially for internal versions off the main CVS
 ;;; branch, it gets hairier, e.g. "0.pre7.14.flaky4.13".)
-"0.8.1.5"
+"0.8.1.6"