将.NET表达式树链接到新程序集中 [英] Linking a .NET Expression Tree into a new assembly

问题描述

我正在尝试编写自己的玩具My Toy Language-> MSIL编译器，以便更好地了解编译器的工作方式。我可以进行语法分析和词法分析，已经构建了表达式树，并使用System.Linq.Expressions表达式树API，我有一个有效的解释器。现在，我想发出一些真实的MSIL程序集。

I'm trying to write my own toy My Toy Language -> MSIL compiler in order to get a better understanding of how compilers work. I got the parsing and lexing working, I have built the expression trees and using the System.Linq.Expressions expression tree API, I have a working interpreter. Now I would like to emit some real MSIL assemblies.

问题是，我不知道如何实际构建这些程序集。 MethodBuilder 类仅接受原始的MSIL方法主体，因此我必须获取表达式树的原始MSIL。调用 Expression.Compile（）返回一个有效的委托，但我不是能够获得其潜在的MSIL。调用 MethodInfo.GetMethodBody（）会引发InvalidOperationException

The problem is, I can't figure out how to actually build these assemblies. The MethodBuilder class only accepts raw MSIL method bodies, so I have to get the raw MSIL of my expression tree. Calling Expression.Compile() returns a working delegate but I'm not able to get its underlying MSIL. Calling MethodInfo.GetMethodBody() throws an InvalidOperationException since it's not implemented in that specific child class.

如何将该委托链接到新程序集中？

How can I link that delegate into a new assembly?

推荐答案

刚刚找到了它。 DLR版本的LambdaExpression公开了完全满足我需要的CompileToMethod方法。

Just found it. The DLR version of LambdaExpression exposes a CompileToMethod method which does exactly what I need.

lambdaExpression.CompileToMethod(myMethodBuilder);

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