From: "Sven C. Koehler" <schween@...>
Date: 2008-08-20T20:19:43+09:00
Subject: Re: [Bug:1.8] Re: Hard question: Any ideas why this code leaks memory?

On Wed, Aug 20, 2008 at 03:44:15PM +0900, Nobuyoshi Nakada wrote:
> At Wed, 20 Aug 2008 12:49:41 +0900,
> Sven C. Koehler wrote in [ruby-talk:311908]:
> > Yep, and it seems to be fixed in 1.8.7-p71 :
> > http://rubyforge.org/tracker/?func=detail&aid=15425&group_id=426&atid=1698
> 
> Hmmm, indeed.  But it seems to occur with the latest 1.8.

I tried some of the patches mentioned on the page on my ruby-1.8.6, and this is
the patch which worked for me (saves me some time before upgrading to 1.8.7).

-S.

--- parse.old.y 2008-08-20 10:59:56.000000000 +0000
+++ parse.y     2008-08-20 11:08:16.000000000 +0000
@@ -5716,7 +5716,7 @@
                    rb_mem_clear(vars+i, len-i);
                }
                else {
-                   *vars++ = (VALUE)ruby_scope;
+                   *vars++ = 0;
                    rb_mem_clear(vars, len);
                }
                ruby_scope->local_vars = vars;
@@ -5732,6 +5732,7 @@
                if (!(ruby_scope->flags & SCOPE_CLONE))
                    xfree(ruby_scope->local_tbl);
            }
+            ruby_scope->local_vars[-1] = 0; /* no reference needed */
            ruby_scope->local_tbl = local_tbl();
        }
     }