From: Yasuhiro Fukuma <yasuf@...>
Date: 1999-04-17T10:30:40+09:00
Subject: [ruby-dev:6628] [BUG] 1.instance_variables ==> SEGV

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福間@福岡 です。

以下がSEGVします:

  $ ruby-1.3 -ve '1.instance_variables'
  ruby 1.3.2 (1999-04-13) [i386-freebsd4.0]
  /tmp/rbc55908:1: [BUG] Segmentation fault

  $ ruby-1.3 -e '
  > class Object
  >   attr_accessor :foo
  > end
  > one, two = 1, 2
  > one.foo = "hoge"
  > p one.instance_variables
  > p two.instance_variables
  > '
  ["@foo"]
  nil

とりあえず同封のpatchのようにしてみましたが、その前に generic_iv_tbl を
きちんと初期化すべきでしょうか?

# 気分的には two.iv == [] なんじゃないかという気もちょっとしますが…

---
 Yasuhiro Fukuma (福間 康弘) as Yasu.F @ Kitakyushu.Fukuoka.Japan
 Web site: http://www8.big.or.jp/~yasuf/
 “InterNIC is NOT NSI!”

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--- variable.c.orig	Wed Mar 24 17:52:34 1999
+++ variable.c	Fri Apr 16 18:55:59 1999
@@ -926,7 +926,7 @@
 	if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
 	    st_table *tbl;
 
-	    if (st_lookup(generic_iv_tbl, obj, &tbl)) {
+	    if (generic_iv_tbl && st_lookup(generic_iv_tbl, obj, &tbl)) {
 		ary = rb_ary_new();
 		st_foreach(tbl, ivar_i, ary);
 		return ary;

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