hakorune/docs/development/roadmap/phases/phase-15/ROADMAP.md

Phase 15 — Box Stacking Roadmap (Living)

This roadmap is a living checklist to advance Phase 15 with small, safe boxes. Update continuously as we progress.

Now (ready/green)

• v0 Ny parser (Ny→JSON IR v0) with wrappers (Unix/Windows)
• Runner JSON v0 bridge (--ny-parser-pipe) → MIR → MIR-Interp
• E2E + roundtrip practical recipes (Windows/Unix)
• Docs path unify (phase-15 under roadmap tree)
• Direct bridge (design + skeleton; feature-gated)
• AOT P2 stubs (CraneliftAotBox/LinkerBox) + RUN smoke wiring
• JIT‑only baseline stabilized (core smokes green; plugins optional)
• Roundtrip (Case A/B) aligned; Case A re‑enabled via parser pipe
• using/namespace (gated) + nyash.link minimal resolver
• NyModules + ny_plugins regression suite (Windows path normalization/namespace derivation)
• Standard Ny scripts scaffolds added (string/array/map P0) + examples + jit_smoke

Next (small boxes)

1. LLVM Native EXE Generation (Phase 15.2) 🚀
   • Python/llvmlite implementation as primary path (2400 lines, 10x faster development)
   • LLVM backend object → executable pipeline completion
   • Separate nyash-llvm-compiler crate (reduce main build weight)
   • Input: MIR (JSON/binary) → Output: native executable
   • Link with nyrt runtime (static/dynamic options)
   • Plugin all-direction build strategy (.so/.o/.a simultaneous generation)
   • Integration: nyash --backend llvm --emit exe program.nyash -o program.exe
2. Standard Ny std impl (P0→実体化)
   • Implement P0 methods for string/array/map in Nyash (keep NyRT primitives minimal)
   • Enable via nyash.toml [ny_plugins] (opt‑in); extend tools/jit_smoke.sh
3. Ny compiler MVP (Ny→MIR on JIT path) (Phase 15.3) 🎯
   • Ny tokenizer + recursive‑descent parser (current subset) in Ny; drive existing MIR builder
   • Target: 800 lines parser + 2500 lines MIR builder = 3300 lines total
   • No circular dependency: nyrt provides StringBox/ArrayBox via C ABI
   • Flag path: NYASH_USE_NY_COMPILER=1 to switch rust→ny compiler; rust parser as fallback
   • Add apps/selfhost-compiler/ and minimal smokes
   • Stage‑1 checklist:
     • return/int/string/arithmetic/paren JSON v0 emit
     • Minimal ASI（newline separator + continuation tokens）
     • Smokes: return 1+2*3 / grouping / string literal
   • Stage‑2 checklist:
     • local/if/loop/call/method/new/var/logical/compare
     • PHI 合流は Bridge に委譲（If/Loop）
     • Smokes: nested if / loop 累積 / and/or × if/loop
4. PHI 自動化は Phase‑15 後（Core‑14 LoopForm）
   • Phase‑15: 現行の Bridge‑PHI を維持し、E2E 緑とパリティを最優先
   • Core‑14: LoopForm 強化＋逆Loweringで PHI を自動生成（合流点の定型化）
5. Bootstrap loop (c0→c1→c1')
   • Use existing trace/hash harness to compare parity; add optional CI gate
   • This achieves self-hosting! Nyash compiles Nyash
6. VM Layer in Nyash (Phase 15.4) ⚡
   • Implement MIR interpreter in Nyash (13 core instructions)
   • Dynamic dispatch via MapBox for instruction handlers
   • BoxCall/ExternCall bridge to existing infrastructure
   • Optional LLVM JIT acceleration for hot paths
   • Enable instant execution without compilation
   • Expected: 5000 lines for complete VM implementation
7. Plugins CI split (継続)
   • Core always‑on (JIT, plugins disabled); Plugins as optional job (strict off by default)

Later (incremental)

• v1 Ny parser (let/if/call) behind NYASH_JSON_IR_VERSION=1
• JSON v1 bridge → MirBuilder (back-compat v0)
• 12.7 sugars normalized patterns in bridge (?. / ?? / range)
• E2E CI-lite matrix (no LLVM) for v0/v1/bridge roundtrip
• Ny script plugin examples under apps/plugins-scripts/
• Expand std Ny impl (String P1: trim/split/startsWith/endsWith; Array P1: map/each/filter; Map P1: values/entries/forEach)
• using/nyash.link E2E samples under apps/ (small project template)
• Tighten Plugins job: migrate samples to Core‑13; re‑enable strict diagnostics

Operational switches

• Parser path: --parser {rust|ny} or NYASH_USE_NY_PARSER=1
• JSON dump: NYASH_DUMP_JSON_IR=1
• （予告）LoopForm: Core‑14 で仕様化予定
• Selfhost compiler: NYASH_USE_NY_COMPILER=1, child quiet: NYASH_JSON_ONLY=1
• Load Ny plugins: NYASH_LOAD_NY_PLUGINS=1 / --load-ny-plugins
• AOT smoke: CLIF_SMOKE_RUN=1

Recipes / Smokes

• JSON v0 bridge: tools/ny_parser_bridge_smoke.sh / tools/ny_parser_bridge_smoke.ps1
• E2E roundtrip: tools/ny_roundtrip_smoke.sh / tools/ny_roundtrip_smoke.ps1

Implementation Dependencies

• Phase 15.2 (LLVM EXE) → Phase 15.3 (Nyash Compiler) → Phase 15.4 (VM in Nyash)
• Python llvmlite serves as rapid prototyping path while Rust/inkwell continues
• Plugin all-direction build enables static executable generation
• Total expected Nyash code: ~20,000 lines (75% reduction from 80k Rust)

Stop criteria (Phase 15)

• v0 E2E green (parser pipe + direct bridge) including Ny compiler MVP switch
• v1 minimal samples pass via JSON bridge
• AOT P2: emit→link→run stable for constant/arith
• Phase‑15 STOP には PHI 切替を含めない（PHI は LoopForm/Core‑14 で扱う）
• 15.3: Stage‑1 代表サンプル緑 + Bootstrap smoke（フォールバック許容）+ 文分離ポリシー公開
• Docs/recipes usable on Windows/Unix

Notes

• JSON is a temporary, safe boundary. We will keep it for observability even after the in-proc bridge is default.
• Favor smallest viable steps; do not couple large refactors with new features.

Ny Plugins → Namespace (Plan)

• Phase A (minimal): Add a shared NyModules registry (env.modules.{set,get}).
  • Map file path → namespace (project‑relative, separators → ., trim extension).
  • R5 hook: if a Ny plugin returns an exports map/static box, register it under the derived namespace.
  • Guard: reject reserved prefixes (e.g., nyashstd.*, system.*).
• Phase B (scope): Optionally run [ny_plugins] in a shared Interpreter to share static definitions.
  • Flag: NYASH_NY_PLUGINS_SHARED=0 to keep isolated execution.
  • Logs: [ny_plugins] <ns>: REGISTERED | FAIL(reason).
• Phase C (language bridge): Resolve using foo.bar via NyModules, then fallback to file/package resolver (nyash.link).
  • Keep IDE‑friendly fully qualified access; integrate with future nyash_modules/.