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9. Kaleidoscope: Adding Debug Information — LLVM 20.0.0git documentation

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Welcome to Chapter 9 of the “Implementing a language with LLVM” tutorial. In chapters 1 through 8, we’ve built a decent little programming language with functions and variables. What happens if something goes wrong though, how do you debug your program? Source level debugging uses formatted data that helps a debugger translate from binary and the state of the machine back to the source that the programmer wrote. In LLVM we generally use a format called DWARF. DWARF is a compact encoding that represents types, source locations, and variable locations. The short summary of this chapter is that we’ll go through the various things you have to add to a programming language to support debug info, and how you translate that into DWARF. Caveat: For now we can’t debug via the JIT, so we’ll need to compile our program down to something small and standalone. As part of this we’ll make a few modifications to the running of the language and how programs are compiled. This means that we’ll have a so

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