Ruby Issue Tracking System

12/24/2025

10:37 PM Ruby Revision 3e82da72 (git): ZJIT: Don't mark control-flow opcodes as invalidating locals (#15694)

jump, branchif, etc don't invalidate locals in the JIT; they might in the interpreter because they can execute arbitrary code, but the JIT side exits before that happens. tekknolagi (Maxwell Bernstein)

12/16/2025

12:10 AM Ruby Revision 98cac1a7 (git): Point people to redmine on ZJIT docs (#15499)

Fix https://github.com/Shopify/ruby/issues/900 tekknolagi (Maxwell Bernstein)

12/15/2025

04:52 PM Ruby Revision 9581d6c8 (git): ZJIT: Add iongraph-generating Ruby script (#15466)

Run like so:
$ ../tool/zjit_iongraph.rb ../build-dev/miniruby --zjit-call-threshold=2 tmp/ghbug.rb
false
false
tmp/ghbug.rb:3:in 'Object#doit': this shouldnt ever be nil (RuntimeError)
from tmp/ghbug.rb:10:in... tekknolagi (Maxwell Bernstein)

12/12/2025

06:14 PM Ruby Revision 3a0596b9 (git): ZJIT: Add Shape type to HIR (#15528)

It's just a nicety (they fit fine as CUInt32) but this makes printing
look nicer in real execution and also in tests (helps with #15489).
Co-authored-by: Randy Stauner <randy@r4s6.net> tekknolagi (Maxwell Bernstein)

12/11/2025

09:12 PM Ruby Revision 64062792 (git): ZJIT: Check method visibility when optimizing sends (#15501)

Fix https://github.com/Shopify/ruby/issues/874 tekknolagi (Maxwell Bernstein)

12/10/2025

04:08 PM Ruby Revision ed18a212 (git): ZJIT: Check if shape is too complex before reading ivar by index (#15478)

This fixes a crash when the new shape after a transition is too complex;
we need to check that it's not complex before trying to read by index. tekknolagi (Maxwell Bernstein)

12/08/2025

04:59 PM Ruby Revision fd45496f (git): Update ZJIT docs (#15449)

tekknolagi (Maxwell Bernstein)

12/04/2025

02:27 AM Ruby Revision 0af85a1f (git): ZJIT: Optimize setivar with shape transition (#15375)

Since we do a decent job of pre-sizing objects, don't handle the case where we would need to re-size an object. Also don't handle too-complex shapes.
lobsters stats before:
```
Top-20 calls to C functions from JIT code (79.4% of total ... tekknolagi (Maxwell Bernstein)

01:25 AM Ruby Revision 3efd8c67 (git): ZJIT: Inline Kernel#class (#15397)

We generally know the receiver's class from profile info. I see 600k of these when running lobsters. tekknolagi (Maxwell Bernstein)

11/26/2025

11:36 PM Ruby Revision db94a79d (git): ZJIT: Count fallback reasons for set/get/definedivar (#15324)

lobsters:
```
Top-4 setivar fallback reasons (100.0% of total 7,789,008):
shape_transition: 6,074,085 (78.0%)
not_monomorphic: 1,484,013 (19.1%)
not_t_object: 172,629 ( 2.2%)
too_complex: 58,281 ( 0.7%)
Top-3 geti... tekknolagi (Maxwell Bernstein)