From: nobu.nokada@...
Date: 2002-08-18T11:06:17+09:00
Subject: Re: Help with a segv in mod_ruby - interpreter bug?

Hi,

At Sun, 18 Aug 2002 10:42:53 +0900,
Patrick May wrote:
> >  If you can give your complete configuration (apparently you run 1.6.7,
> >  right ?) and your script to try to reproduce the segfault ?
> 
> My config:
> Windows 2k  with ruby 1.6.5 (2001-09-19) [i386-cygwin]
> 
> to reproduce my segfault in cygwin ruby requires 2 files:

Perhaps, Since new signleton classes for nil/false/true are
never referred from them, these classes will be collected.

This patch may fix the problem, but I guess the solution in 1.7
is much better.

Index: class.c
===================================================================
RCS file: /cvs/ruby/src/ruby/class.c,v
retrieving revision 1.14.2.15
diff -u -2 -p -r1.14.2.15 class.c
--- class.c	11 Jul 2002 08:24:53 -0000	1.14.2.15
+++ class.c	18 Aug 2002 02:02:26 -0000
@@ -613,7 +613,8 @@ rb_undef_method(klass, name)
 }
 
-#define SPECIAL_SINGLETON(x,c) if (obj == (x)) {\
+#define SPECIAL_SINGLETON(x,c,n) if (obj == (x)) {\
     if (!FL_TEST(c, FL_SINGLETON)) {\
 	c = rb_singleton_class_new(c);\
+	st_add_direct(rb_class_tbl, rb_intern(n), c);
 	rb_singleton_class_attached(c,obj);\
     }\
@@ -631,7 +632,7 @@ rb_singleton_class(obj)
     }
     if (rb_special_const_p(obj)) {
-	SPECIAL_SINGLETON(Qnil, rb_cNilClass);
-	SPECIAL_SINGLETON(Qfalse, rb_cFalseClass);
-	SPECIAL_SINGLETON(Qtrue, rb_cTrueClass);
+	SPECIAL_SINGLETON(Qnil, rb_cNilClass, "NilClass");
+	SPECIAL_SINGLETON(Qfalse, rb_cFalseClass, "FalseClass");
+	SPECIAL_SINGLETON(Qtrue, rb_cTrueClass, "TrueClass");
 	rb_bug("unknown immediate %d", obj);
     }


-- 
Nobu Nakada