WASM: Runtime Library Experiment

[ubaidsk]

Earlier this week (before meet with Dr. Ondrej), I experimented/played with possibility of supporting runtime library by bridging via javascript.

Example:

(lp) lpython$ cat examples/expr2.py 
from ltypes import f64
from numpy import cos, sin

@ccall
def _lfortran_dsin(x: f64) -> f64:
    pass

def main0():
    theta: f64 = 2.0
    print(sin(theta)**2.0 + cos(theta)**2.0)
    
    pi: f64 = 3.141592653589793238462643383279502884197
    print(_lfortran_dsin(pi/2))

main0()
(lp) lpython$ lpython examples/expr2.py --backend wasm -o tmp  
(lp) lpython$ node --experimental-wasi-unstable-preview1 tmp.js
(node:32581) ExperimentalWarning: WASI is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
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(lp) lpython$