diff options
| author | Kaz Kylheku <kaz@kylheku.com> | 2018-03-19 06:59:27 -0700 |
|---|---|---|
| committer | Kaz Kylheku <kaz@kylheku.com> | 2018-03-19 06:59:27 -0700 |
| commit | dbcca06d216201506c20cb3b3aa2524e46fbb746 (patch) | |
| tree | 0dcaa4075efb18f0721e0d5113c570273c2251d1 | |
| parent | f79d41823aa5c266e356fa0b792ad5cc58162d7d (diff) | |
| download | txr-dbcca06d216201506c20cb3b3aa2524e46fbb746.tar.gz txr-dbcca06d216201506c20cb3b3aa2524e46fbb746.tar.bz2 txr-dbcca06d216201506c20cb3b3aa2524e46fbb746.zip | |
compiler: bug: inappropriate clobber in block.
* share/txr/stdlib/compiler.tl (compiler comp-block): Don't
use bfrag.oreg as the output register of block.
Firstly, bfrag.oreg might be (t 0) which is read-only.
Worse, bfrag.oreg could just be a variable from which
the block obtains its return value; we mustn't clobber
that location with block's dynamic return value. Not only
mustn't but possibly we cannot: the location could be
out of scope!
| -rw-r--r-- | share/txr/stdlib/compiler.tl | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/share/txr/stdlib/compiler.tl b/share/txr/stdlib/compiler.tl index 4c5eb7e5..d7f11229 100644 --- a/share/txr/stdlib/compiler.tl +++ b/share/txr/stdlib/compiler.tl @@ -202,8 +202,8 @@ (let* ((nreg (if name me.(get-dreg name) '(t 0))) (bfrag me.(comp-progn oreg env body)) (lskip (gensym "l"))) - (new (frag bfrag.oreg - ^((block ,bfrag.oreg ,dreg ,lskip) + (new (frag oreg + ^((block ,oreg ,nreg ,lskip) ,*bfrag.code (end ,bfrag.oreg) ,lskip) |