Working with LLVM - Githubissues

cjvillar / cis_27_group_project

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Working with LLVM #2

Open stlamoureux1 opened 2 months ago

stlamoureux1 commented 2 months ago

Share insights, resources, and issues for using LLVM.

stlamoureux1 commented 2 months ago

Updated:

~~Issue 1: I can't get a build to work on my Linux machine. I'll see if I can use binaries instead and let you know.~~

Relatively painless to get the precompiled binaries working. Should be useable for me if we want to go with it.
Also found that includes and linking were working better with CMake under VSCode with C/C++ extension, so we might be pretty locked into CMake as build system if we use LLVM.

Thought: Still figuring it out, but I'm assuming it's necessary to write a translation scheme from AST to LLVM IR manually. It looks like that IR is quite complex in itself so I'm wondering how much we gain compared to translating to asm or to C.

Actually seeing a little bit more it does look much simpler than using real asm so I think it's worth it to give it a shot.

stlamoureux1 commented 2 months ago

One alternative that might be more lightweight: https://asmjit.com

stlamoureux1 commented 2 months ago

Resources:

A quick overview tutorial for LLVM IR: -- https://mcyoung.xyz/2023/08/01/llvm-ir/
Youtube playlist going over generating LLVM IR: -- https://www.youtube.com/watch?v=Lvc8qx8ukOI&list=PLGNbPb3dQJ_5Dv45KhMlt9HMSlnfMyb2V&pp=iAQB -- This guy's channel also has playlists for trasnpilers, type checkers, etc. I'll be trying to get through as much as I can.
Book on mapping high-level constructs to IR, focused on C/C++: -- https://mapping-high-level-constructs-to-llvm-ir.readthedocs.io/en/latest/index.html

stlamoureux1 commented 2 months ago

Also if you want to get a feel for it I would recommend writing some C code and compiling it with: $ clang -S -emit-llvm -o [name].ll [name].c and you can view the IR that way.

stlamoureux1 commented 2 months ago

Gonna drop this here as well:

https://github.com/PacktPublishing/Learn-LLVM-17/tree/main/Chapter02/calc/src

Comes from a book on LLVM 17 from O'Reilly. I'm able to get online access to the book with my public library account you might wanna try similar. Shows how the visitor pattern is used is for getting IR from ASTs, so I'm gonna be going through that and trying to internalize it.