ruby-dev

Bug #1329: Ruby 1.8.8 で "p eval('0' + '+0.1'*n)" が Segmentation Fault を発生させる
http://redmine.ruby-lang.org/issues/show/1329

起票者: Kenta Murata
ステータス: Open, 優先度: Normal
カテゴリ: core, Target version: Ruby 1.8.8
ruby -v: ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]

"p eval('0' + '+0.1'*n)" を評価すると、
n がある値 N1 を超えたときに TypeError が、
N2 を超えたときに Segmentation Fault が発生します。
N1 と N2 がアーキテクチャに依存するかどうかは調べてません。

  $ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*4581)"
  ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
  458.100000000036
  $ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*4582)"
  ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
  -e:1: can't modify frozen string (TypeError)
  $ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*5132)"
  ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
  -e:1: can't modify frozen string (TypeError)
  $ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*5133)"
  ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
  Segmentation fault

eval しなければ TypeError も SEGV も発生しないことは確認済です。

  $ ~/ruby-1.8.8-r23009/bin/ruby -ve "'0'+'+0.1'*5133"
  ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
  -e:1: warning: useless use of + in void context


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[ruby-dev:38208] [Bug #1329] Ruby 1.8.8 で "p eval('0' + '+0.1'*n)" が Segmentation Fault を発生させる

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