82 lines
3.3 KiB
Markdown
82 lines
3.3 KiB
Markdown
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# Ny JSON IR v0 — Minimal Spec (Stage‑2)
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Status: experimental but stable for Phase‑15 Stage‑2. Input to `--ny-parser-pipe`.
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Version and root
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- `version`: 0
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- `kind`: "Program"
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- `body`: array of statements
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Statements (`StmtV0`)
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- `Return { expr }`
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- `Extern { iface, method, args[] }` (optional; passes through to `ExternCall`)
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- `Expr { expr }` (expression statement; side effects only)
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- `Local { name, expr }` (Stage‑2)
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- `If { cond, then: Stmt[], else?: Stmt[] }` (Stage‑2)
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- `Loop { cond, body: Stmt[] }` (Stage‑2; while(cond) body)
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Expressions (`ExprV0`)
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- `Int { value }` where `value` is JSON number or digit string
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- `Str { value: string }`
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- `Bool { value: bool }`
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- `Binary { op: "+"|"-"|"*"|"/", lhs, rhs }`
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- `Compare { op: "=="|"!="|"<"|"<="|">"|">=", lhs, rhs }`
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- `Logical { op: "&&"|"||", lhs, rhs }` (short‑circuit)
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- `Call { name: string, args[] }` (function by name)
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- `Method { recv: Expr, method: string, args[] }` (box method)
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- `New { class: string, args[] }` (construct Box)
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- `Var { name: string }`
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CFG conventions (lowered by the bridge)
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- If: create `then_bb`, `else_bb`, `merge_bb`. Both branches jump to merge if unterminated.
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- Loop: `preheader -> cond_bb -> (body_bb or exit_bb)`, body jumps back to cond.
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- Short‑circuit Logical: create `rhs_bb`, `fall_bb`, `merge_bb` with constants on fall path.
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- All blocks end with a terminator (branch/jump/return).
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PHI merging (current behavior)
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- If: locals updated in `then`/`else` merge at `merge_bb` via `phi`.
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- Else欠落時は else 側に分岐前(base)を採用。
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- 片側にしか存在しない新規変数はスコープ外として外へ未伝播。
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- Loop: `cond_bb` にヘッダ PHI を先置き（preheader/base と latch/body end を合流）。
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- 目的: Stage‑2 を早期に安定化させるための橋渡し。将来（Core‑14）は LoopForm からの逆LoweringでPHI自動化予定。
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Type meta (emitter/LLVM harness cooperation)
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- `+` with any string operand → string concat path（handle固定）。
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- `==/!=` with both strings → string compare path。
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Special notes
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- `Var("me")`: Bridge 既定では未定義エラー。デバッグ用に `NYASH_BRIDGE_ME_DUMMY=1` でダミー `NewBox{class}` を注入可（`NYASH_BRIDGE_ME_CLASS` 省略時は `Main`）。
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- `--ny-parser-pipe` は stdin の JSON v0 を受け取り、MIR→MIR‑Interp 経由で実行する。
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CLI/Env cheatsheet
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- Pipe: `echo '{...}' | target/release/nyash --ny-parser-pipe`
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- File: `target/release/nyash --json-file sample.json`
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- Verbose MIR dump: `NYASH_CLI_VERBOSE=1`
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- me dummy: `NYASH_BRIDGE_ME_DUMMY=1 NYASH_BRIDGE_ME_CLASS=ConsoleBox`
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Examples
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Arithmetic
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```json
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{"version":0,"kind":"Program","body":[
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{"type":"Return","expr":{
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"type":"Binary","op":"+",
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"lhs":{"type":"Int","value":1},
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"rhs":{"type":"Binary","op":"*","lhs":{"type":"Int","value":2},"rhs":{"type":"Int","value":3}}
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}}
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]}
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```
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If with local + PHI merge
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```json
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{"version":0,"kind":"Program","body":[
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{"type":"Local","name":"x","expr":{"type":"Int","value":1}},
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{"type":"If","cond":{"type":"Compare","op":"<","lhs":{"type":"Int","value":1},"rhs":{"type":"Int","value":2}},
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"then":[{"type":"Local","name":"x","expr":{"type":"Int","value":10}}],
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"else":[{"type":"Local","name":"x","expr":{"type":"Int","value":20}}]
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},
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{"type":"Return","expr":{"type":"Var","name":"x"}}
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]}
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```
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