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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Graham,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’ve worked to some extent on dynamically compiling ST in
the new C# port. The code can be browsed at <a
href="http://fisheye2.atlassian.com/browse/antlrcs/">http://fisheye2.atlassian.com/browse/antlrcs/</a>
in the Antlr3.StringTemplate subdirectory. Three alternatives are included in
the source.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Near direct translation of the Java code.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Composition of lambda methods during the ST parse stage.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Manual code generation through </span><span style='font-size:
8.0pt;font-family:Consolas'>DynamicMethod</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The code for the compiled techniques is found in the following
files:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ActionEvaluator.g3 (and the generated ActionEvaluator.cs)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ActionEvaluatorHelper.cs<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ASTExpr.cs<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo3'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ConditionalExpr.cs<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Both of the compilation techniques produced good performance results.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<table class=MsoTableLightShadingAccent1 border=1 cellspacing=0 cellpadding=0
style='border-collapse:collapse;border:none'>
<tr>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ported Java<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Functors<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>DynamicMethod<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Maintainability<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Excellent<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Poor<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Debugging<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Excellent<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Very good<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Poor<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Parse and compile time<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Excellent<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Poor*<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Memory usage<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Moderate<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good**<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Excellent<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Execution time<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Poor<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Very good<o:p></o:p></span></p>
</td>
<td width=160 valign=top style='width:119.7pt;border:none;background:#D3DFEE;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Excellent***<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The Grade<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>16<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>19<o:p></o:p></span></b></p>
</td>
<td width=160 valign=top style='width:119.7pt;border-top:solid #4F81BD 1.0pt;
border-left:none;border-bottom:solid #4F81BD 1.0pt;border-right:none;
padding:0in 5.4pt 0in 5.4pt'>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>13<o:p></o:p></span></b></p>
</td>
</tr>
</table>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>* This should be avoided by parsing once and GetInstanceOf for each
usage. It’s so slow that it makes DynamicMethod the slowest overall
technique for minimal-reuse templates (1-10? usages maybe).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>** I haven’t evaluated how functor caching affects this.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>*** This is an asymptotic characteristic for high-reuse templates.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Overall, the technique using lambda methods appears to be the
superior choice. The following combination of build macros and constants should
be a decent place to start testing:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Define the </span><span style='font-size:8.0pt;font-family:Consolas'>COMPILE_EXPRESSIONS</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>
build macro.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Optionally define the </span><span style='font-size:8.0pt;
font-family:Consolas'>CACHE_FUNCTORS</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'> build macro. I believe it
would provide good results if you are caching your templates, but might leak
memory over time.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Set </span><span style='font-size:8.0pt;font-family:Consolas'>ASTExpr.EnableDynamicMethods
= <span style='color:blue'>false</span></span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>. (This is the default.)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Set </span><span style='font-size:8.0pt;font-family:Consolas'>ASTExpr.EnableFunctionalMethods
= <span style='color:blue'>true</span></span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>. (This is the default.)<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There was long thread (subject “StringTemplate Compiler
for .NET”, Feb. 28 ‘09 through Apr. 1 ‘09) on this list
talking about how to further optimize ST, but I haven’t implemented several
of the items discussed. I’m planning on traveling to USF in late July for
a brainstorming session on future ANTLR/ST optimization.<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Sam<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
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stringtemplate-interest-bounces@antlr.org
[mailto:stringtemplate-interest-bounces@antlr.org] <b>On Behalf Of </b>Graham
Brooks<br>
<b>Sent:</b> Thursday, June 18, 2009 9:48 AM<br>
<b>To:</b> stringtemplate-interest@antlr.org<br>
<b>Subject:</b> [stringtemplate-interest] String template compiler<o:p></o:p></span></p>
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<p class=MsoNormal>All,<o:p></o:p></p>
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<p class=MsoNormal>I am part of a team that is completing work on the first
phase of a web application using StringTemplate. As we have continued to tune
the performance of the application StringTemplate AST execution has emerged as
a hot spot. Application and template updates are part of application deployment
so we have already turned on template caching. One of the options open to us is
to write a compiler to improve template rendering performance. I have exchanged
a couple of email with Terence and he suggested I reach out to this list for a
few pointers.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Thanks in advance...<o:p></o:p></p>
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<p class=MsoNormal><span class=apple-style-span><i><span style='font-size:18.0pt;
font-family:"Brush Script MT";color:black'>Graham</span></i></span><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
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