From: Yusuke ENDOH <mame@...>
Date: 2008-08-28T20:52:05+09:00
Subject: [ruby-dev:36029] Re: [Bug #513] Tempfile yields [BUG] Stack consistency error

遠藤です。

2008/08/28 11:18 Shyouhei Urabe <redmine@ruby-lang.org>:
> zsh % gdb --args ~/target/trunk/bin/ruby -rtempfile -ve
>  Tempfile.open("") do |f|
>   f.write "\n";
>   f.rewind;
>   g = Tempfile.new "";
>   f.each {break};
>   g.rewind;
>  end
>  '
(snip)
>  -e:1: [BUG] Stack consistency error (sp: 16, bp: 15)
(snip)


簡単にできました。

$ ./ruby -e '
class Foo
  define_method(:foo) do |&b|
    b.call
  end
end

Foo.new.foo do
  break
end
'
-e:8: [BUG] Stack consistency error (sp: 7, bp: 6)
ruby 1.9.0 (2008-08-28 revision 18895) [i686-linux]

-- control frame ----------
c:0003 p:0032 s:0007 b:0006 l:001084 d:001084 TOP    -e:8
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :private_class_method
c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP    <dummy toplevel>:17
---------------------------
DBG> : "-e:8:in `<main>'"
-- backtrace of native function call (Use addr2line) --
0x8112df4
0x813e18e
0x813e1d8
0x810bc5f
0x810c3a4
0x810c58c
0x805aa3f
0x805bd46
0x8058e70
0xb7e21ea8
0x8058d51
-------------------------------------------------------
Aborted


BMETHOD 中で throw する可能性があるので、BMETHOD を呼び出す前に
スタックを縮めるべきかと思います。

Index: vm_insnhelper.c
===================================================================
--- vm_insnhelper.c	(revision 18895)
+++ vm_insnhelper.c	(working copy)
@@ -519,8 +519,8 @@
 	      }
 	      case NODE_BMETHOD:{
 		VALUE *argv = cfp->sp - num;
+		cfp->sp += - num - 1;
 		val = vm_call_bmethod(th, id, node->nd_cval, recv, klass, num,
argv, blockptr);
-		cfp->sp += - num - 1;
 		break;
 	      }
 	      case NODE_ZSUPER:{

-- 
Yusuke ENDOH <mame@tsg.ne.jp>