How Compilers Work: Introduction to LLVM Passes
summary
Step‑by‑step C++ shows how to implement, CMake and register an out-of-tree plugin for opt, including the minimal "hello world" pass that prints each function name and argument count and can be scheduled twice from the command line. It builds a real transformation that replaces 8-bit adds with an equivalent MB-algebra sequence, verifies correctness with lli (example returns 10) and reports 3 replacements via opt stats, and it builds a standalone analysis tool (static call counter), plus LIT-based tests from the llvm-tutor repo.
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chapters (8)
- 0:00LLVM and passes intro
- 3:18Setting up LLVM env
- 12:19Hello world LLVM pass
- 23:24Transformation pass
- 34:21Analysis tool
- 43:35Testing passes with Lit
- 49:34Debugging LLVM tips
- 51:40Q&A
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