Pre-initialize with Wizer

[Dan C]

Hi everyone,

I recently came across this tool https://github.com/bytecodealliance/wizer, which doesn't seem designated for Emscripten. I'm wondering whether anyone had any luck with it.

Thanks,

Dan

[Thomas Lively]

I believe Emscripten used to have a similar feature, but we had to disable it because it turned out that we depended on JS setting some values in memory before running the Wasm code and the pre-evaluation tool couldn’t account for that. I’m not sure whether that situation has changed, though.

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[Sam Clegg]

The emscripten feature only worked for running static constructors I believe (We should resurrect that feature in binaryen!).  Wizer actually tries to run as much of `main` as it can too.     

I don't see any reason why emscripten and wizer couldn't be used together but I don't know of any attempts to do so.  One wrinkle is that, unlike with wasi executables, not all emscripten programs have a single `main` entry point, but act more like libraries for JS programs.

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