Subject: Re: [xsl] Maximum recursion depth exceeded From: bryan rasmussen <rasmussen.bryan@xxxxxxxxx> Date: Tue, 7 Jul 2009 15:41:27 +0200 |
On Tue, Jul 7, 2009 at 3:16 PM, Dimitre Novatchev<dnovatchev@xxxxxxxxx> wrote: > On Tue, Jul 7, 2009 at 1:19 AM, bryan > rasmussen<rasmussen.bryan@xxxxxxxxx> wrote: >> On Tue, Jul 7, 2009 at 9:55 AM, Michael Kay<mike@xxxxxxxxxxxx> wrote: >>>> anyway, recursion problems are likely to be a problem in .NET >>>> / C#, as far as I know currently the only .NET language that >>>> can compile and optimize for tail recursion is F#.. >>> >>> Well, I know of at least two others: XSLT and XQuery, as implemented by >>> Saxon. >>> >> I don't think those would be considered as .NET languages, those are >> languages implemented in .NET. Sorry if I was imprecise earlier. >> > > 1. Quite some of Bryan's statements about how "System.Xml.Xsl" does > work are far from correct. One of them is that tail recursion is not > supported. Tail recursion *is* optimized by XslCompiledTransform in > non-debugging mode. > I never said that Tail recursion is not supported in XSLT or system.xml.xsl. I said that the only .NET language I am aware of where it is supported is F# - I'm not sure if I would consider an XSLT compiled via XslCompiledTransform to be a '.NET language' (I believe I used the example of C#) , I haven't really thought about it though - would you say it is? > 2. To the original OP: The message by Saxon is generally presented > whenever Saxon runs out of memory -- this may or maynot be caused by > recursion stack overflow! > > To summarize: Prefer using DVC recursion to tail-recursion as a > practical way to avoid the recursion stack overflow problem. you're right of course, specifically as regards the practicality - but it is annoying when I know I have a function that is properly tail recursive and it overflows anyway...(This would be a C# problem, not XSLT in System.XML.XSL) Cheers, Bryan Rasmussen
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