global const optimization

[blooddy]

const A:i32 = 1;
const B:i32 = A + 1;

export function test():i32 {
    return B;
}

output

// module.ts(2,15): warning TS/AS121: Compiling global with unsupported constant initializer expression as mutable.

(module
 (type $i (func (result i32)))
 (type $v (func))
 (global $B (mut i32) (i32.const 0))
 (memory $0 1)
 (export "test" (func $test))
 (export "memory" (memory $0))
 (start $.start)
 (func $test (; 0 ;) (type $i) (result i32)
  (get_global $B)
 )
 (func $.start (; 1 ;) (type $v)
  (set_global $B
   (i32.const 2)
  )
 )
)

[dcodeIO]

This seems like a bug and should actually be supported.

[dcodeIO]

Wait, are you using the prototype from npm? In master it should be start instead of .start. So this might not be a bug but due to the prototype not supporting it.

[blooddy]

im using web http://assemblyscript.org/try/

[dcodeIO]

I see, that's still the prototype as well.

[blooddy]

Are you going to update the web version?

[dcodeIO]

Sure, going to do that eventually. Ideally once arrays and strings are implemented.

[dcodeIO]

AssemblyScript is now available as a template in WebAssembly Studio. Basically a better playground :)