Creating DWARF debug info

[weichx]

I'm a compiler writer and exploring using binaryen as the backend for a new language I am working on (not going through llvm). I'm trying to figure out how to make this debuggable. I have line/column/file info already and I see (using the c-api) that I can set expression offsets and generate source maps. That's working just fine. However, except for browsers, every wasm runtime I've seen only supports DWARF for debugging. Is there a way to emit the DWARF info with binaryen? Maybe I'm missing something but I can't figure out how to generate it. Could someone either tell me if this is not supported though it looks like it is after reading through this issue, or provide a hello world style example of how this can be done?

[kripken]

Binaryen has some DWARF support, but limited, and focused only on passing through and rewriting DWARF as needed.

Instead, what I'd recommend is this:

1. Use source maps in Binaryen.
2. Use a tool to convert source maps to DWARF for wasm runtimes that only support DWARF.

The second tool might already exist - I think I've heard of one - but I'm not sure offhand (the opposite direction definitely exists already, and is not that complex, so hopefully source maps to DWARF could be simple as well).

[weichx]

Thanks for the clarification, I'll look into that.