Runtime: allow one to directly access values exported in the runtime

[hhugo]

The goal is to address LexiFi/gen_js_api#177
cc mlasson

@vouillon, can this work with wasmoo ?

[smorimoto]

@hhugo Ping

[hhugo]

@vouillon, how do you want to implement such feature ?

[vouillon]

I have pushed something. It only works with whole-program compilation, though. With separate compilation, only the JavaScript primitives used in the Wasm runtime are linked-in. I'm not sure what to do about that.

[hhugo]

I have pushed something. It only works with whole-program compilation, though. With separate compilation, only the JavaScript primitives used in the Wasm runtime are linked-in. I'm not sure what to do about that.

Could we add a syntax to re-export js value to the wasm runtime ?

[hhugo]

I have pushed something. It only works with whole-program compilation, though. With separate compilation, only the JavaScript primitives used in the Wasm runtime are linked-in. I'm not sure what to do about that.

Could we add a syntax to re-export js value to the wasm runtime ?

IIUC, we just need a way to tell the wasmoo compiler that additional js value must be included when building the js runtime.
The current mechanism checks the wasm code for import of the "js" namespace. We could either trick the system with "fake" import of additional js value or have a separate mechanism such as an annotation in the js runtime files.