MixinPlan

Entry names this jar owns, always whole nest groups. The shards carry them too and that is fine — this jar sits ahead of them in classpath order and wins, exactly as the overlay already wins over the source jars behind it. What K2 rejects is a nest group SPLIT across two units, never a duplicated one.

Internal names the compile classpath carries. A grafted implements naming anything else makes the TARGET unusable — "cannot access X which is a supertype of Y" — and a runtime-synthesized mixin's interface is in no jar.

The rename as a TABLE: reading Mixin's intermediary answers back into mojmap. Global by nature — it translates names, and a name means the same thing whichever jar it was read from.

The rename as a DECISION: whether this jar's bytes get rewritten at all. Per jar, because mc-symbols is already mojmap — rename would find nothing to map in it, but only after parsing every method body and rebuilding every constant pool. 79% of what this overlay grafts comes from that one jar.

Graft each target's added declarations onto its own source bytes and write the result to tmp. Returns the number of classes written.

Whether iface or anything it extends declares one of keys, as emitGraft keys them.

Re-emit base with the added declarations appended, opened by revealAccess — they are added after widenClassFile ran, so nothing else would open them. Descriptors come from the intermediary side and are renamed on the way in; bodies are aconst_null; athrow, since this jar is only ever compiled against.

A failing jar costs only its own targets — what it already wrote stays, and the caller's count reports the shortfall against the plan.

Every claimed entry is emitted, grafted or not: a nest group arriving half from here and half from the shard behind us is the split K2 rejects. The widen matches the shard's, so a duplicate costs its bytes and nothing else.