ruby-dev

なかだです。

At Mon, 30 Mar 2009 05:50:40 +0900,
Kenta Murata wrote in [ruby-dev:38207]:
> "p eval('0'+'+0.1'*n)" を評価すると、n がある値 N を超えたときに
> スタックが溢れますが、バージョン 1.9.2 の N が バージョン 1.9.1 より
> 小さくなっています。 

再現できませんでした。

$ ./ruby -ve "p eval('0'+'+0.1'*6714)"
ruby 1.9.2dev (2009-03-30 trunk 23097) [i386-darwin9.0]
671.40000000008411

$ ./ruby -ve "p eval('0'+'+0.1'*6715)"
ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]
-e:1:in `eval': stack level too deep (SystemStackError)
	from -e:1:in `<main>'

> $ ~/ruby-1.9.1-r22762/bin/ruby -ve "p eval('0'+'+0.1'*13093)"
> ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]
> 1309.2999999999
> $ ~/ruby-1.9.1-r22762/bin/ruby -ve "p eval('0'+'+0.1'*13094)"
> ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]
> -e:1:in `eval': stack level too deep (SystemStackError)
>         from -e:1:in `<main>'
> 
> $ ~/ruby-1.9.2-r23093/bin/ruby -ve "p eval('0'+'+0.1'*7481)"
> ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]
> 748.10000000010155
> $ ~/ruby-1.9.2-r23093/bin/ruby -ve "p eval('0'+'+0.1'*7482)"
> ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]
> -e:1:in `eval': stack level too deep (SystemStackError)
>         from -e:1:in `<main>'

それぞれのコンパイルオプションは同じでしょうか。

-- 
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
    中田 伸悦

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[ruby-dev:38212] Re: [Bug #1328] "p eval('0' + '+0.1'*n)" の挙動

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[#38160] addressing to rb_jmp_buf — 真野靖 <mano@...>