Brummel
4ad003d21f
First new milestone after kernel-extension-mechanics close.
RawBuf is the canonical kernel-tier *base* extension: mutable,
indexed, bounded-size flat buffer of primitive elements
({Int, Float, Bool}, restricted via prep.3's param-in). It
unblocks two downstream needs already in the backlog:
- series milestone #8 — library-tier ring buffer wrapping RawBuf.
- Embedding-ABI batch-FFI (subsumes closed #2) — the M5
friction-harvest measured per-tick FFI at ~206 ns/tick on
real EURUSD volume; RawBuf is the contiguous-slice primitive
that amortises that per-tick cost.
The milestone also fulfils the whitepaper § "Plugin contract"
commitment: the migration of the hardcoded
try_emit_primitive_instance_body into a registry is triggered
by the first real base extension shipping.
Decomposition (R — registry-first refactor, 3 iters):
raw-buf.1 — Intercept registry refactor. Lift the existing
hard-coded match (eq__Str, compare__Int|Bool|Str, float_*) into
a registry table. Zero behavioural change; ratified by the
existing E2E suite (eq_primitives_smoke / compare_primitives_smoke
in e2e.rs, float_compare_smoke, eq_ord_polymorphic). Pure
refactor — the cleanest possible bisection target.
raw-buf.2 — RawBuf kernel-tier manifest + checker side. Rename
crates/ailang-kernel-stub/ → crates/ailang-kernel/ and reshape
as a family-crate (src/{kernel_stub,raw_buf}/{mod.rs,source.ail});
public surface preserved via re-exports. Consumer code with
(con RawBuf (con Int)) passes ail check; ail build fails with
intercept-not-registered — that diagnostic IS the ratification.
raw-buf.3 — RawBuf codegen intercepts + Term::New desugar +
stub retirement. Register 12 element-type-specialised entries
(4 ops × {Int,Float,Bool}); lower via @ailang_rc_alloc +
getelementptr + load/store. Desugar (new T args) →
(app T.new args) so Term::New is eliminated before codegen
(completes the prep.2 deferral). Retire the kernel_stub
submodule + the round-trip test at design_schema_drift.rs:743;
ailang-kernel crate stays as the family-crate for future
series/matrix/… modules.
Ordering rationale: raw-buf.1 ships zero behavioural change so
its failure mode is "existing tests break" — cleanest bisection.
raw-buf.2 ships the checker-visible surface on an unchanged
codegen substrate, so its failure mode is checker-isolated.
raw-buf.3 lands codegen on a registry that has already absorbed
every legacy intercept, so the RawBuf entries do not co-mingle
with a registry move.
Kernel-tier crate organisation: rejected pro-modul-crate
(crates/ailang-series/, crates/ailang-matrix/, ...) for sublinear
scaling and onboarding locality; rejected sub-Cargo-crates under
crates/ailang-kernel/ (C1) for Cargo-boilerplate overhead with no
real consumer benefit at AILang's scale. C2 (one family-crate,
sub-folders per module, lib.rs re-exports) keeps Cargo dep
surface flat (ailang-surface needs one dep, not N) and stub
retirement is a submodule delete + re-export drop.
Out of scope: bounds checks (caller checks via RawBuf.size per
whitepaper — UB-on-overflow is the contract), RawBuf.fill /
.copy / .iter (deferred until series or Embedding-ABI concretely
asks), record element types (SoA — Forward Axis).
Grounding-check PASS on 10 load-bearing assumptions about
current code state (intercept dispatch site, existing E2E
ratifiers, ailang-kernel-stub crate layout, parse_kernel_stub
location).
Brainstorm → planner handoff: first iteration scope is raw-buf.1
(§ Architecture point 1, § Components row 1).