hakorune/legacy-byname-removal.md at 9bdf2ff06976c8c268a70387ace4baf74b7246d0

Files

nyash-codex dda65b94b7 Phase 21.7 normalization: optimization pre-work + bench harness expansion

- Add opt-in optimizations (defaults OFF)
  - Ret purity verifier: NYASH_VERIFY_RET_PURITY=1
  - strlen FAST enhancement for const handles
  - FAST_INT gate for same-BB SSA optimization
  - length cache for string literals in llvmlite
- Expand bench harness (tools/perf/microbench.sh)
  - Add branch/call/stringchain/arraymap/chip8/kilo cases
  - Auto-calculate ratio vs C reference
  - Document in benchmarks/README.md
- Compiler health improvements
  - Unify PHI insertion to insert_phi_at_head()
  - Add NYASH_LLVM_SKIP_BUILD=1 for build reuse
- Runtime & safety enhancements
  - Clarify Rust/Hako ownership boundaries
  - Strengthen receiver localization (LocalSSA/pin/after-PHIs)
  - Stop excessive PluginInvoke→BoxCall rewrites
- Update CURRENT_TASK.md, docs, and canaries

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Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-13 16:40:58 +09:00

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Legacy By‑Name Call Removal Plan

Context

Unified call system is default. VM routes by Callee kind (Global/Method/Extern/…)
Legacy by‑name resolution (callee=None → string name lookup) is gated by env and OFF by default.
Goal: remove legacy code path once parity is proven at integration/full levels.

Guards / Current Behavior

旧 by‑name 経路は削除済み。NYASH_VM_ALLOW_LEGACY は廃止。
既定: callee=None 生成時は Fail‑Fast（Builder で Callee を必ず付与）。

Scope of Work

Identify callers that could still rely on legacy resolution
- Builder emissions that may omit callee (should be none after Phase 1 refactor)
- Any VM entry points or helpers constructing by‑name calls dynamically
- Older tests or tools expecting by‑name lookups
Ensure unified path covers them
- For Global user functions: attach Callee::Global("Module.func")
- For dynamic/indirect calls: mark Callee::Value and keep VM restrictions explicit
- For extern‑like names: delegate via handlers/calls/externs.rs (SSOT)
- Normalize arity (foo/1 → foo) via utils::normalize_arity_suffix
Strengthen tests
- Smokes/quick: unified path（by‑name 不可）を既に強制
- Integration/full: ユーザー関数呼び出し/extern 名正規化のカナリアを追加
- 旧ENV依存がないことを確認（NYASH_VM_ALLOW_LEGACY は削除済）
Remove legacy code path
- Delete src/backend/mir_interpreter/handlers/calls/legacy.rs and its resolver module
- Drop env guard checks referring to legacy path (keep error message clarity)
- Update READMEs to remove temporary notes

Readiness Criteria (before removal)

quick/integration/full all green with legacy OFF
No callee=None emission in builder (verified by grepping MIR JSON / code review)
Extern SSOT accepts arity‑suffixed names; Global extern‑like names delegate properly

Rollback Plan

Keep a small revertable commit boundary for legacy deletion
If issues appear, reintroduce legacy.rs with the same path under a dev‑guard until fixed

Cross‑References

handlers/calls/README.md (SSOT and boundaries)
docs/ENV_VARS.md (env guards and policies)

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