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    <p>If I were going to make a C# compiler today, here's what I would <del>do</del> try as a first attempt:</p> <ol> <li>Start with the ANTLR C# 3 target (of course I'm biased here - seriously you can use either the CSharp2 or CSharp3 target).</li> <li>Get Visual Studio 2010 with the .NET Framework 4. The key here is .NET 4 and it's sweet new expression trees.</li> <li>Build a basic combined parser. Put as little logic in the parser as absolutely possible. It should have few (if any) actions, and the output should be an undecorated AST that can be walked with LL(1) walker.</li> <li>Build a tree grammar to walk the tree and identify all declared types. It should also keep the <code>member_declaration</code> sub-trees for later use.</li> <li>Build a tree walker that walks a single <code>member_declaration</code> and adds the member to the <a href="http://msdn.microsoft.com/en-us/library/system.reflection.emit.typebuilder%28VS.100%29.aspx" rel="nofollow noreferrer"><code>TypeBuilder</code></a>. Keep track of the method bodies but don't deep-walk them yet.</li> <li>Build a tree walker that walks the body of a method. Generate an <a href="http://msdn.microsoft.com/en-us/library/bb335710%28VS.100%29.aspx" rel="nofollow noreferrer"><code>Expression&lt;TDelegate&gt;</code></a> matching the method, and use <del>the <a href="http://msdn.microsoft.com/en-us/library/dd728258%28VS.100%29.aspx" rel="nofollow noreferrer"><code>CompileToMethod</code></a> method</del> my own API (see Pavel's and my comments) to generate the IL code.</li> </ol> <p>If you do things in this order, then when you are finally parsing the expressions (method bodies, field initializers), you can use the <code>string</code> parameterized methods <a href="http://msdn.microsoft.com/en-us/library/bb351107%28VS.100%29.aspx" rel="nofollow noreferrer">like this one</a> in the <a href="http://msdn.microsoft.com/en-us/library/system.linq.expressions.expression%28VS.100%29.aspx" rel="nofollow noreferrer"><code>Expression</code></a> class to save work resolving members.</p>
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    1. POBuilding own C# compiler using ANTLR: Compilation Unit
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    1. USSam Harwell
    1. USSam Harwell
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    1. COUnfortunately, `CompileToMethod` cannot truly be used in this scenario because of its inherent limitations - there's no way to compile in a code to another method that you're generating alongside, and the target `MethodBuilder` has to be for a static method only. See https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=473128 for more details.
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      1. USPavel Minaev
    2. CONice. Well, then I'd start by building an `Expression` compiler that works in those cases, and then use that instead. :) I'd keep the `Expression` compiler as an independent module so it could be used with other projects (and maybe I'll do it for fun anyway).
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      1. USSam Harwell
    3. COPerhaps just to deviate a bit from my qn above: I hv the source code for antlr-3.1.3. N under the runtime folder, there are 2 folders - CSharp n CSharp3. Since u mentioned abt CSharp3, u know why there are 2 folders? However the API provided online seemed to be for CSharp only not CSharp3, also the compiled dll too. If someone wants to use CSharp3, he has to compile the codes there himself? To me it seems like CSharp3 has more advanced features, but not really relevant in my context.
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