54 lines
2.8 KiB
Markdown
54 lines
2.8 KiB
Markdown
# De‑Rust Roadmap (Phase 21.9+)
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Purpose: reduce Rust surface (non‑plugin) while keeping correctness and reversibility. Make Hakorune (Hako) the primary host for parsing/building/executing; keep Rust for kernel/ABI/thin wrappers.
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## Phases
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### Phase 0 — Archive (low risk)
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- Target: Rust LLVM backend (src/backend/llvm) — deprecated in favor of Python llvmlite.
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- Action: move to `archive/rust-llvm-backend/` with a clear RESTORE.md.
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- Acceptance: `cargo build --release` (default features) remains green; quick smokes green.
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- Revert: `git mv archive/rust-llvm-backend/llvm src/backend/`.
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### Phase 1 — Quick Wins (1–2 months)
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- hv1_inline → Hako parity (already functionally covered; keep as perf path).
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- MIR interpreter parity check; route Primary to Hako VM.
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- TLV codec → C shim (FFI) with thin Rust wrapper.
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- LLVM wrapper → Hako/C harness (Python stays primary until Hako IR is ready).
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Deliverables & Tests
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- hv1_inline: parity canaries = phase2037/flow + phase2170/state; add `HAKO_VERIFY_DISABLE_INLINE` opt-out (optional).
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- TLV C shim: round‑trip tests (encode→decode) on representative payloads; FFI error mapping spec.
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- MIR interpreter: keep as diagnostic path; parity sample set (const/binop/compare/branch/jump/ret/phi/mir_call minimal).
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- LLVM wrapper: unify CLI entry; ensure `NYASH_LLVM_USE_HARNESS=1` path stays green.
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### Phase 2 — Core Thinning (2–4 months)
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- Plugin loader thin C wrapper (dlopen/dlsym), unify host ABI.
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- Basic boxes (Array/Map/File) small C core (handle‑based), keep Rust shim.
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- Resolver/Using: SSOT in Hako; runner uses shared policy.
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SSOT for Using/Resolver (summary)
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- Resolution order: modules (nyash.toml) → relative path inference → not found (warn) with verbose details.
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- Analyzer/HakoCheck follows the same order; runner shares policy helpers. No path‑literal using in strict profiles.
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### Phase 3 — Long‑haul (3–6 months)
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- Python llvmlite → Hako IR builder + C ABI.
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- Parser/MIR builder fully Hako‑first; Rust becomes fallback.
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- NyKernel minimal C runtime (BoxCall dispatcher + collections + file).
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## Principles
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- Guard everything by env/features; defaults unchanged.
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- Keep changes reversible (small diffs, RESTORE docs, fallbacks).
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- Test gates: quick smokes + representative hv1/hakovm parity.
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## Today (suggested)
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1) Stage Phase‑0 move as a script (not auto‑run) + RESTORE.md.
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2) Add phase docs (docs/private/roadmap/phases/phase-21.9/PLAN.md).
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3) Keep CI/dev instructions intact (no build break when features=none).
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## Test Strategy (gates)
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- Quick: tools/smokes/v2/profiles/quick/core/* (phase2037 flow, phase2170 state) — green.
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- Verify routing: HAKO_VERIFY_PRIMARY=hakovm (default); hv1_inline perf path parity (env toggles only).
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- Build: `cargo build --release` (default features); LLVM paths are opt‑in.
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- Docs: keep RESTORE steps for any archived parts; small diffs, easy rollback.
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