VS Code Rust wasmtime debugger? · wasmtime

Stream: wasmtime

Topic: VS Code Rust wasmtime debugger?

Philippe Parisot (Oct 08 2020 at 19:03):

Sorry if this isn't the right place to ask this.

I took wasmtime for a spin and it's very impressive.

My setup for debugging didn't work sadly and I was curious what was the common way to step through code in wasmtime, if there is one.

I use the C/C++ extension on VS Code with GDB on Linux, works well for Rust native, with wasmtime however I wasn't able to make it work (added "miDebuggerArgs": "wasmtime" in launch.json).

In the command line it works well enough with gdb wasmtime and lldb wasmtime

Wondering if anyone had any success on VS Code. Thanks!

Till Schneidereit (Oct 08 2020 at 19:52):

Great to hear that Wasmtime works well for you!

Till Schneidereit (Oct 08 2020 at 19:52):

@Yury Delendik is the expert on all things debugging, and I know that he has debugging in VS Code working, and might be able to help

Yury Delendik (Oct 08 2020 at 19:56):

just to clarify, @Philippe Parisot are you trying to debug JIT'ed wasm code compiled from C or Rust, and not wasmtime itself?

Philippe Parisot (Oct 08 2020 at 19:57):

Yes sorry

Philippe Parisot (Oct 08 2020 at 19:57):

To be able to step through rust code running on wasmtime via VS Code

Philippe Parisot (Oct 08 2020 at 19:57):

Was wondering if anyone was already able to do this

Yury Delendik (Oct 08 2020 at 19:59):

I did it in the past, but you will need specific VSCode extension (don't remember which one, maybe CodeLLDB)

Yury Delendik (Oct 08 2020 at 20:00):

args shall include "wasmtime" and "-g" too

Yury Delendik (Oct 08 2020 at 20:05):

Screen shot from old demo video

Yury Delendik (Oct 08 2020 at 20:05):

Screen-Shot-2020-10-08-at-3.04.46-PM.png

Philippe Parisot (Oct 08 2020 at 20:40):

Awesome thanks @Yury Delendik for the quick help!

Philippe Parisot (Oct 08 2020 at 20:40):

Gonna give it a shot

Gabor Greif (Oct 11 2020 at 15:25):

What @Yury Delendik is describing does work for me (CodeLLDB plugin), albeit with another language, not Rust. On macOS I constantly see https://github.com/bytecodealliance/wasmtime/issues/2127. Normally you have to press the green triangle a few times to get started.

lldb: address 0x0000000100000000 maps to more than one section · Issue #2127 · bytecodealliance/wasmtime

Recently I have started to get strange warnings from wasmtime (HEAD) when running programs using lldb on Darwin. Below is a transcript. ../../llvm/bin/lldb -- target/debug/wasmtime -g sumsX.mo.wasm...

Last updated: Dec 23 2024 at 14:03 UTC