This ports the Baseline stubs for .length on arrays, unboxed arrays, and arguments objects to CacheIR.

Comment on attachment 8732515 [details] [diff] [review] Patch Review of attachment 8732515 [details] [diff] [review]: ----------------------------------------------------------------- Looks good. ::: js/src/jit/CacheIR.h @@ +119,5 @@ > }; > > +// We use this enum as GuardClass operand, instead of storing Class* pointers > +// in the IR, to keep the IR compact and the same size on all platforms. > +enum class GuardClassKind Hmm, the same size on all platforms is a little compelling. This works for builtin classes, but will fail in the face of "make sure this has the same class as", without big switches both ways. I guess we can add that if we need it, later.

(In reply to Eric Faust [:efaust] from comment #2) > This works for > builtin classes, but will fail in the face of "make sure this has the same > class as", without big switches both ways. I guess we can add that if we > need it, later. Yup, once we need to store arbitrary Class pointers, we can add a new op or change this.