1169741 - Come up with a more fleshed out plan for lexically scoped this

Status: NEW

(Core :: JavaScript Engine, defect)

Description

[Eric Faust [:efaust]]

The current, very hazy plan is:

- reimplement 'this'*
    - as a binding with aliasing and TDZ support
        - change JSOP_SETTHIS to JSOP_INIT(ALIASED)LEXICAL or something very similar
        - test:
            var g;
            class D extends B { constructor() { g = x => super(x); } }
            try { new D } catch (x) {}
            g(0) // should "work", setting 'this', the first call only
    - change computeThis() to be more dynamic (in eval and arrow-function frames)
    - remove JSOP_THIS

This is not a fully flushed out solution, but it's a start.

Comment 1

[Eric Faust [:efaust]]

h/t sfink