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If you're not looking to implement one totally from scratch, this could be a good start: http://llvm.org/docs/tutorial/

Yeah, I've been working on LLVM lately and it seems like they've solved all the problems. Somehow, they solved them in standard C++. I've been through a bunch of compilers and I could barely hang on. In LLVM, everywhere I go, I'm like: oh, so that's how you do that.

One thing that helped get started was slides from a CMU class. Hang on:

https://www.cs.cmu.edu/~15745/syllabus.html

Excellent work and so nice of them to post it for free.

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