是否有 Java 库可以从 AST 生成类文件? [英] Is there a Java library to generate class files from an AST?

问题描述

本页 描述了我如何使用 javac 中的代码生成器来生成给定的代码我可以构建一个 AST(使用我编写的单独的解析器).该技术涉及编辑 javac 的源代码以基本上绕过 Java 解析器，以便可以将他/她自己的 AST 提供给代码生成器.这可以工作，但我希望以更简洁的方式来完成.我想将 javac 的代码生成部分作为库包含在我的项目中，这样我就可以使用它来生成代码，而无需附带 javac 的其余源代码.

This page describes how I can use the code generator in javac to generate code given that I can build an AST (using a separate parser which I wrote). The technique involves editing javac's source code to basically bypass the Java parser, so that one could supply his/her own AST to the code generator. This could work, but I was hoping to do it in a slightly cleaner way. I want to include the code generating part of javac as a library in my project so I can use it to generate code, without bringing with it the rest of javac's source.

有没有办法用 javac 做到这一点，或者有没有更好的库?

Is there a way to do this with javac, or is there perhaps a better library?

另外，请随意更改问题的标题.我想不出更好的方法，但它有点模棱两可.如果你建议修改一个更好的标题，我会接受.

Also, feel free to change the question's title. I couldn't think of a better one, but it's a little ambiguous. If you suggest an edit for a better title, I'll accept it.

推荐答案

我想你可能感兴趣的是像 BCEL(字节码工程库)

I think what you might be interested in is a java library like BCEL(ByteCode Engineering Library)

当我学习编译器构造的课程时，我玩过它，基本上，它有一个很好的包装器来生成常量池，将命名的字节码指令插入到方法中等等，然后当你完成后，你可以使用自定义类加载器在运行时加载类，或以正常方式将其写入文件.

I played around with it back when I took a class on compiler construction, basically, it has a nice wrapper for generating the constant pool, inserting named bytecode instructions into a method and whatnot, then when you are done, you can either load the class at runtime with a custom classloader, or write it out to a file in the normal way.

使用 BCEL，从语法树到 Java 字节码应该相对容易，虽然有点乏味，但在某些情况下，您可能只想使用 BCEL 生成原始字节码而不构建树.

With BCEL, it should be relatively easy to go from the syntax tree to the java bytecodes, albeit a bit tedious, but you may want to just use BCEL to generate the raw bytecode without building the tree as well in some cases.

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