1482253 - Create CacheIR Op metadata

Status: RESOLVED DUPLICATE of bug 1526425

(Core :: JavaScript Engine: JIT, enhancement, P3)

Description

[Matthew Gaudet (he/him) [:mgaudet]]

In a similar manner to how the JS Opcodes have metadata, it would be useful to provide metadata on CacheIR ops. 

At minimum, the length would be incredibly useful to have. However I can also imagine use for information like whether or not the operand has a stub field or not.

It would simplify writing CacheIR parsing code like this [1], where the length is 'expected' but there's no way to assert or ensure this remains true outside of auditing. 


[1]: https://searchfox.org/mozilla-central/rev/aff5d4ad5d7fb2919d267cbc23b1d87ae3cf0110/js/src/jit/BaselineInspector.cpp#322-349

Comment 1

[Matthew Gaudet (he/him) [:mgaudet]]

Oh-- other data you could collect: 

- Does the op fill in the result register
- If so, what type?

Comment 2

[Matthew Gaudet (he/him) [:mgaudet]]

Forward duping to the more thoroughly thought through Bug 1526425