WebAssembly Debugging DWARF support ?

[hardfist]

When I use wasm with dwarf debug info in nodejs, it seems that the callstack does not supports c++ source code sourcemapping, which is inconvenient for wasm debugging.

Describe the solution you'd like
Chrome devtools supports DWARF now, https://developers.google.com/web/updates/2019/12/webassembly, so maybe node could do the same thing.
Describe alternatives you've considered
Please describe alternative solutions or features you have considered.

[hardfist]

@RReverser could node do the same things like chrome devtools?

[RReverser]

@RReverser could node do the same things like chrome devtools?

In theory - yes, but it would need a completely separate implementation. Until then, it's easier to use source map support for which there are Node modules that remap stacktraces.

[hardfist]

how can i get the DWARF sourcemapping？

[RReverser]

As I said, you need to use source maps instead of DWARF. You can find how to produce source maps in Emscripten docs.

[devsnek]

@RReverser where's the latest wasm_source_map source at? i'd be interested to see if we can add support.

[RReverser]

@devsnek Ah yeah that could work too. It's here: https://github.com/emscripten-core/emscripten/blob/main/tools/wasm-sourcemap.py

[RReverser]

Although that one uses LLVM output, probably won't help you much. Let me find another implementation...

[RReverser]

So this one has been removed from DevTools, but you can still extract and reuse for stacktraces: https://github.com/ChromeDevTools/devtools-frontend/tree/2aa60e27d7c022b1c22cf5e65e12060a41ee4b36/front_end/sdk/wasm_source_map

DevTools themselves use a completely different approach now to integrate debugging deeper with what LLDB can do, but it's not necessary for something as simple as stacktraces.