1d6fab4eda
✅ 主な更新内容: - Python/llvmlite実装の正式採用を明記（開発速度10倍、~2400行） - プラグイン全方向ビルド戦略（.so/.o/.a同時生成）で単一EXE生成可能に - 各実装の予想コード量を具体化（パーサー800行、MIR Builder 2500行、VM 5000行） - 循環依存問題の解決を明記（nyrtがC ABI経由で提供） - 現実的なスケジュール調整（2025年9月～2026年3月） 🎉 最新進捗: - dep_tree_min_string.nyashオブジェクト生成成功（10.4KB） - LLVM verifier green - dominance違反解決 - Resolver patternでSSA安全性確保 🚀 次のマイルストーン: - Python/llvmliteでEXE生成パイプライン完成 - nyash-llvm-compiler分離設計 - NyashパーサーMVP実装開始 Everything is Boxの究極形が、ついに実現へ！ 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
71 lines
4.0 KiB
Markdown
71 lines
4.0 KiB
Markdown
# Lowering Contexts (Boxing the API)
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Motivation
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- Current lowering functions carry too many parameters (10+), scattering responsibilities and making invariants (Resolver-only, localization discipline, dispatch-only PHI) hard to enforce.
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- Following Nyash’s “Everything is Box” philosophy, we group related data into small, composable context boxes to create clean boundaries and make invariants structural.
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Core Context Boxes
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- LowerFnCtx<'ctx, 'b>
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- Holds: `codegen`, `func`, `cursor`, `resolver`, `vmap`, `bb_map`, `preds`, `block_end_values`, `phis_by_block`, optional `const_strs`, `box_type_ids`.
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- Utilities: `ensure_i64/ptr/f64` (Resolver-only), `with_block(..)`, `with_pred_end(..)`, `guard_post_terminator`.
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- Effect: All lowering entrypoints can accept a single `&mut LowerFnCtx`.
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- BlockCtx<'ctx>
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- Holds: `cur_bid`, `cur_llbb` (from `bb_map`), optionally `succs`.
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- Role: The canonical site for “where to insert” decisions; pred-end casts are routed via this box.
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- InvokeCtx
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- Holds: `method_id: u16`, `type_id: i64`, `recv_h: IntValue<'ctx>`, `args: &[ValueId]`.
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- Role: Unifies plugin invoke by-id/by-name into a single API surface.
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- StringOps (lightweight types/helpers)
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- Types: `StrHandle(IntValue<'ctx>)`, `StrPtr(PointerValue<'ctx>)`.
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- Rule: across blocks keep `StrHandle`; convert to `StrPtr` only at call sites in the same BB; return values of string ops are kept as `StrHandle`.
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- Entry: `StringOps::concat(ctx, blk, lhs, rhs) -> LlResult<StrHandle>` etc.
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API Sketch
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```
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pub type LlResult<T> = Result<T, String>;
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pub struct LowerFnCtx<'ctx, 'b> { /* see above */ }
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pub struct BlockCtx<'ctx> { pub cur_bid: BasicBlockId, pub cur_llbb: BasicBlock<'ctx> }
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pub struct InvokeCtx<'ctx> { pub method_id: u16, pub type_id: i64, pub recv_h: IntValue<'ctx>, pub args: Vec<ValueId> }
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impl<'ctx, 'b> LowerFnCtx<'ctx, 'b> {
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pub fn ensure_i64(&mut self, blk: &BlockCtx<'ctx>, v: ValueId) -> LlResult<IntValue<'ctx>> { /* Resolver-only */ }
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pub fn ensure_ptr(&mut self, blk: &BlockCtx<'ctx>, v: ValueId) -> LlResult<PointerValue<'ctx>> { /* i64 PHI -> inttoptr here */ }
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pub fn with_pred_end<R>(&mut self, pred: BasicBlockId, f: impl FnOnce(&Builder) -> R) -> R { /* insert before terminator */ }
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}
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pub fn lower_boxcall(ctx: &mut LowerFnCtx, blk: &BlockCtx, inst: &BoxCallInst) -> LlResult<()> { /* … */ }
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pub fn try_handle_tagged_invoke(ctx: &mut LowerFnCtx, blk: &BlockCtx, call: &InvokeCtx) -> LlResult<()> { /* … */ }
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pub mod string_ops {
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pub struct StrHandle<'ctx>(pub IntValue<'ctx>);
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pub struct StrPtr<'ctx>(pub PointerValue<'ctx>);
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pub fn concat(ctx: &mut LowerFnCtx, blk: &BlockCtx, lhs: ValueId, rhs: ValueId) -> LlResult<StrHandle> { /* … */ }
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}
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```
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Invariants Enforced by Design
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- Resolver-only: `VMap` is not exposed; all value access goes through `LowerFnCtx` utilities.
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- Localization discipline: PHIs at BB head; casts at pred-end via `with_pred_end`.
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- Strings handle rule: Only `StrHandle` crosses block boundaries; `StrPtr` generated only in the same BB at call sites.
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- LoopForm rule: preheader mandatory, header condition built via Resolver; dispatch-only PHI. Dev guard checks enforce these.
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Dev Guards (optional, recommended)
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- `PhiGuard::assert_dispatch_only(&LowerFnCtx)` to fail fast when non-dispatch PHIs appear.
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- `LoopGuard::assert_preheader(&LowerFnCtx)` to ensure preheader presence and header i1 formation point.
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- CI Deny-Direct: `rg -n "vmap\.get\(" src/backend/llvm/compiler/codegen/instructions | wc -l` must be `0`.
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Migration Plan
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1) Introduce `LowerFnCtx`/`BlockCtx`/`InvokeCtx`; migrate `lower_boxcall` and invoke path first.
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2) Move string ops to `StringOps` with handle-only rule; clean call sites.
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3) Migrate BinOp/Compare/ExternCall to `LowerFnCtx + BlockCtx` API.
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4) Turn on dev guards; remove remaining fallback paths; simplify code.
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Acceptance
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- Refactored entrypoints accept at most three boxed parameters.
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- Deny-Direct passes (no direct `vmap.get` in lowering/instructions).
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- Dominance: verifier green on representative functions (e.g., dep_tree_min_string).
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