From a796824f378f3c809ea0678a962d62f28c256075 Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <code@mail.matthias.benkard.de>
Date: Fri, 19 Jul 2013 10:20:36 +0200
Subject: Never allocate environment objects on the stack.

We still allocate the actual data vector on the stack sometimes.
---
 sb-eval2.lisp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'sb-eval2.lisp')

diff --git a/sb-eval2.lisp b/sb-eval2.lisp
index f2ff15b..62bd3a7 100644
--- a/sb-eval2.lisp
+++ b/sb-eval2.lisp
@@ -40,7 +40,11 @@
             (,data% (make-array (list ,size%)))
             (,var (%make-environment :parent ,parent :data ,data%)))
        (declare (type (mod #.(1+ +stack-max+)) ,size%)
-                (dynamic-extent ,var)
+                ;; we must not allocate environment objects on the
+                ;; stack unless we can be sure that all child
+                ;; environments will also be allocated on the stack,
+                ;; but we can't really know that.
+                ;(dynamic-extent ,var)
                 (dynamic-extent ,data%))
        ,@body)))
 
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