Wasm target?

[justinclift]

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Started playing around with wasm, using the new Go 1.11 js/wasm target. eg GOOS=js GOARCH=wasm

One drawback there is the complete lack of any kind of debugger.

Thinking about how that could be solved, would the optimal approach be to add some kind of support to Delve for (say) OS=js and ARCH=wasm?

[aarzilli]

Reading this it sounds like there is no way to write a debugger for wasm yet.

[justinclift]

Ahhh yeah, it is kind of light on details:

Debuggers:

    * Basic browser integration can be done through source map support.
    * Full integration for languages like C++ require more standardization effort on
      debugging information format as well as permissions for interrupting programs,state,
      inspecting their modifying their state.
    * Debug information is better delivered on-demand instead of built-in to a WebAssembly
      module.

Sounds like it's depending on the main wasm developers to getting something workable happening there.

Thanks @aarzilli. :smile:

[justinclift]

This looks like the right place to keep an eye on:

https://github.com/WebAssembly/debugging

The charter of that group: https://github.com/WebAssembly/debugging/blob/master/Charter.md

[justinclift]

This looks like the matching in progress debugging standard doc:

• WebAssembly Debugging Capabilities Living Standard (source code for the doc)

And some research by (I'm guessing) a member of the Debugging working group:

• DWARF for WebAssembly Target (source code for the doc)

Hmmm, with initial exploratory implementation for Rust:

• https://github.com/yurydelendik/old-man-sandbox/tree/master/rust-wasm-hey

[paralin]

Has there been any progress towards debugging remote wasm sessions - like "dlv attach" ?