Progress log — P2 (Data & lookup)#

See PLAN.md for the phase table and migration model.

• 2026‑06‑02 — P2 (Data & lookup) merged. All five modules ported into ircd-common (patricia.rs, class.rs, whowas.rs, hash.rs, list.rs), each with an L1 differential test in ircd-testkit. Dropped from the link set: patricia.o, class.o, list.o; substituted: whowas.o→whowas_link.o, hash.o→hash_link.o, and support.o→support_link.o now also -DPORT_SUPPORT_P2 (so MyMalloc/MyRealloc come from Rust). Spec: docs/superpowers/specs/2026-06-02-p2-data-lookup-design.md; plan: docs/superpowers/plans/2026-06-02-p2-data-lookup.md.
  • Verified config findings that shaped the port: ENABLE_CIDR_LIMITS is ON (config.h:738) → patricia.c is live, add_class carries the trailing cidrlen_s, aClass has the CIDR fields, free_class calls patricia_destroy. USE_HOSTHASH+USE_IPHASH ON → hash.c has 6 tables. MyFree is a macro (sys_def.h:26), not a symbol → the "trio" is really MyMalloc+MyRealloc+outofmemory; Rust ports call libc free.
  • Partial‑port mechanism (extends P1's support_link.o): m_whowas and m_hash are command handlers (P5) that format replies through the variadic sendto_one/replies[] path, so they stay C. The CREF oracle compiles the pristine unguarded .o; the link set compiles a <mod>_link.o with -DPORT_<MOD>_P2 that #ifdefs out the ported fns + their owning globals and externs the now‑Rust‑owned ones. To make the oracle export the needed cref_*, file‑static data (was/locked in whowas; the tables/counters/hashtab in hash) was given external linkage — behaviourally inert.
  • Determinism preserved (pinned by L1): bit‑exact hash fns (hashtab[i]=tolower((char)i)*109, nick (<<4)+, uid (<<4)^, channel start‑5/cap‑30/+(i<<1), host/ip 31*+), head‑prepend insertion, stored‑hashv‑then‑mycmp find; whowas ring index advance/wraparound + the uwas link storing the index not a pointer; make_client self/interior pointers + the CLIENT_REMOTE_SIZE = offset_of!(Client,count) branch; make_user/make_server refcnt=1 and free_user/free_server -211000/-211001 recursion sentinels.
  • Also fixed: a pre‑existing P1 flake — the four dbuf_diff tests raced on the shared poolsize/freelist under parallel cargo test; now serialized through a process‑wide mutex.
  • Verification: cargo build warning‑free; the Rust‑driven ircd binary links with list.o dropped (all alloc/list logic now Rust); every *_diff L1 test zero‑diff vs cref_*; layout net green. Deferred to L2/post‑P3: the m_whowas/report_classes sendto_* wire output.