1212247 - Some arrow functions are not jitted (IonAbort) because of JSOP_THIS

Status: RESOLVED DUPLICATE of bug 922406

(Core :: JavaScript Engine: JIT, defect)

Description

[Lars T Hansen [:lth]]

Consider this:

  function f(g) {
    return g();
  }
  f(() => ({ hi: "ho" }));

Run with IONFLAGS=aborts and --ion-eager:

  [IonAbort] JSOP_THIS outside of a JSFunction.
  [IonAbort] aborted @ /Users/lhansen/moz/arrow.js:5
  [IonAbort] Disabling Ion compilation of script /Users/lhansen/moz/arrow.js:1

If I replace the arrow function with a regular function expression the abort goes away.  I have not looked deeper than this (yet).

Comment 1

[Jan de Mooij [:jandem]]

This is bug 922406; defining an arrow function requires a JSOP_THIS for the lexical `this` binding.