inline cache (IC)

RU: inline cache (IC)

A per-call-site optimization where V8 caches the hidden class it last saw and the corresponding property offset, so that the next access with the same hidden class skips a full lookup. An IC progresses through states — Uninitialized → Monomorphic (one shape, fastest) → Polymorphic (2-4 shapes) → Megamorphic (many shapes, falls back to global hashtable).