[ragel-users] arithmetic overflow in generated C# code

Adrian Thurston thurston at complang.org
Thu Jan 28 03:00:13 UTC 2010

I'm trying to reproduce by compiling with mono-gmcs, but I don't seem to 
have ILexer and the compilation stops there. Is that a system library or 
something from Gherkin?

Attila Sztup√°k wrote:
> Hi,
> We've run into a possible bug in the c# code generation - for a set of 
> input files (http://gist.github.com/287694), the generated 
> _lexer_actions table have a length of 130, while the generated type of 
> the indexers (_acts and __acts) is sbyte ([-128..127]), causing an 
> overflow (and an index out of range exception afterwards) when executing 
> the actions. Using Java as output, or changing the types of these 
> variables to short in C# result in the generated machine working as 
> expected. Based on the sources, for all output languages except C#, 
> these indexers have a hardcoded type of UINT.
> Can someone please confirm whether it's really a bug, and/or if there's 
> any workaround?
> thx,
> sztupi
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