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feat(joinir): Phase 63-4 infer_type_from_phi degradation design

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Phase 63-4: infer_type_from_phi を『JoinIR 型ヒント優先＋従来ロジックフォールバック』に縮退する仕様を設計（実装は Phase 63-5+）

## Changes

### Documentation Updates
- **README.md**: Added complete Phase 63-4 design (63-4.1 through 63-4.5)
  - 63-4.1: Current state analysis (definition location, callsites, role, JoinIR preparation)
  - 63-4.2: Degradation spec (type_hint priority + fallback pattern)
  - 63-4.3: Representative cases and A/B testing strategy (P1/P2/P3)
  - 63-4.4: Deletion conditions (5 conditions, current: 2/5 = 40%)
  - 63-4.5: Phase 63-5 handoff (infer_type_from_phi_with_hint() implementation tasks)

- **PHI_BOX_INVENTORY.md**: Updated if_phi.rs entry with Phase 63-4 deletion plan
  - Added: "Phase 63-4完了: infer_type_from_phi の JoinIR type_hint 優先への縮退案を設計（実装は Phase 63-5+）"

- **CURRENT_TASK.md**: Added Phase 63-4 section with summary of design work

## Design Highlights

### Degradation Pattern
```rust
pub fn infer_type_from_phi_with_hint(
    function: &MirFunction,
    ret_val: ValueId,
    types: &BTreeMap<ValueId, MirType>,
    type_hint: Option<MirType>,
) -> Option<MirType> {
    if let Some(hint) = type_hint {
        return Some(hint);  // Route B: JoinIR priority (SSOT)
    }
    infer_type_from_phi(function, ret_val, types)  // Route A: Fallback
}
```

### Representative Cases
- **P1**: IfSelectTest.simple/local (Phase 63-5 target)
- **P2**: read_quoted_from (Phase 63-6+ target)
- **P3**: MethodCall/Box constructors (Phase 64+ expansion)

### Deletion Conditions (2/5 achieved)
1. ✅ JoinIR has type_hint field (Phase 63-3)
2. ✅ Type hints populated for representative cases (Phase 63-2)
3. ⏳ Degraded to type_hint priority (Phase 63-5)
4. ⏳ P1 cases determined by type_hint only (Phase 63-5)
5. ⏳ All functions use type hints (Phase 64+)

## Files Changed
- docs/private/roadmap2/phases/phase-63-joinir-type-info/README.md
- docs/private/roadmap2/phases/phase-30-final-joinir-world/PHI_BOX_INVENTORY.md
- CURRENT_TASK.md

## Next Steps
Phase 63-5: Implement degradation for P1 cases (IfSelectTest.simple/local)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
nyash-codex
2025-11-29 17:58:06 +09:00
parent 41ce55fa53
commit 8f736358c4
16 changed files with 186 additions and 0 deletions
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27
CURRENT_TASK.md
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@ -183,8 +183,35 @@
- PhiBuilderBox ベースの PhiSpec 観察用関数（`extract_phi_spec_from_builder`, `compare_and_log_phi_specs` など）を削除し、PHI 仕様計算を JoinIR 起点の `compute_phi_spec_from_joinir` に一本化。
- 合計約 97 行削減（予想 76 行を超過）。If 側 PHI の「観察・比較」は JoinIR 情報から復元する経路のみとなり、if_phi/PhiBuilderBox は本番ロジックに専念する構造に整理された。
### 1-00h. Phase 62 — PHI Core Cleanup（phi_core 小箱クリーンアップ）
- 目的: PHI 箱のうち、既に機能が JoinIR/loopform/phi_merge 側に移っていて「殻だけ残っていた」小箱を片付け、phi_core 直下の実コードをさらに減らす。
- 実績:
- `phi_core/phi_input_collector.rs` を削除。Phase 59/59b で loopform_builder.rs / loop_builder.rs へのインライン化が完了しており、外部依存 0 であることを PHI_BOX_INVENTORY ベースで確認済み。
- `phi_core/conservative.rs` を 57 行すべてコメントのみの「歴史メモ」ファイルに縮退（実コードは Phase 58 で `phi_merge.rs::merge_all_vars` 側にインライン済み）。将来的に docs/ への移設候補として扱う。
- PHI_BOX_INVENTORY.md / phi-reduction-series/INDEX.md / CURRENT_TASK.md を更新し、「PhiInputCollector 削除済み」「ConservativeMerge 本体は inline 済みで conservative.rs は docs 専用」という現状を明示。
- JoinIR/phi_core 関連テストは全て PASS。既知の `local` キーワード問題を除き、新たな退行はなし。
### 1-00i. Phase 63-3 — JoinIR 型ヒントの最小配線
- 目的: infer_type_from_phi を削る前に、「JoinIR 側で MirType をどこに持てばよいか」を決め、そのための schema 変更と最小限のコード更新を行う。
- 実績:
- `JoinInst::Select` と `MergePair` に `type_hint: Option<MirType>` を追加し、If PHI に関わる値まわりに型ヒントをぶら下げる足場を用意した。
- Select / MergePair を生成する全サイト（if_select.rs / if_merge.rs / nested_if.rs / read_quoted.rs など 13 ファイル）を更新し、新フィールドを一旦 `type_hint: None` で埋めてビルドが通る状態に統一。
- JoinIR 関連テスト（IfSelect/IfMerge/Frontend 系）はすべて PASS。挙動は従来どおりだが、今後 AST/Frontend/Bridge から型ヒントを流し込む準備が整った。
### 1-00j. Phase 63-4 — infer_type_from_phi 縮退設計（設計のみ）
- 目的: infer_type_from_phi を『JoinIR 型ヒント優先＋従来ロジックフォールバック』に縮退する仕様を docs に固定（実装は Phase 63-5+）。
- 実績:
- 63-4.1: infer_type_from_phi の現状整理（定義場所 / 呼び出し元 / 役割 / JoinIR 準備状況）を文書化。
- 63-4.2: 縮退後の仕様設計（type_hint がある場合は優先、ない場合は従来ロジックへフォールバック）。
- 63-4.3: 代表ケースと A/B テスト方針（P1: IfSelectTest.simple/local, P2: read_quoted_from, P3: MethodCall/Box コンストラクタ）を整理。
- 63-4.4: 削除条件の明確化（5条件、現時点達成率 2/5 = 40%）。
- 63-4.5: Phase 63-5 への引き継ぎ（infer_type_from_phi_with_hint() 実装タスク定義）。
- docs: `docs/private/roadmap2/phases/phase-63-joinir-type-info/README.md`, `PHI_BOX_INVENTORY.md` 更新済み
---
## 2. 中期 TODO（ざっくり）

1
src/mir/join_ir/frontend/ast_lowerer/if_in_loop/lowering/single_var_both.rs
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@ -42,6 +42,7 @@ pub fn lower(
cond: cond_id,
then_val,
else_val,
type_hint: None, // Phase 63-3
});
ctx.register_param(var_name.to_string(), result_id);

1
src/mir/join_ir/frontend/ast_lowerer/if_in_loop/lowering/single_var_then.rs
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@ -40,6 +40,7 @@ pub fn lower(
cond: cond_id,
then_val,
else_val,
type_hint: None, // Phase 63-3
});
ctx.register_param(var_name.to_string(), result_id);

1
src/mir/join_ir/frontend/ast_lowerer/if_return.rs
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@ -128,6 +128,7 @@ impl AstToJoinIrLowerer {
cond: cond_var,
then_val: then_var,
else_val: else_var,
type_hint: None, // Phase 63-3
});
// Ret result

1
src/mir/join_ir/frontend/ast_lowerer/loop_patterns/continue_pattern.rs
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@ -212,6 +212,7 @@ fn create_loop_step_function_continue(
cond: continue_cond_var,
then_val: step_acc, // Continue: 更新しない
else_val: acc_increment, // 通常: 更新
type_hint: None, // Phase 63-3
});
// 6. 末尾再帰

1
src/mir/join_ir/frontend/ast_lowerer/loop_patterns_old.rs
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@ -843,6 +843,7 @@ impl AstToJoinIrLowerer {
cond: continue_cond_var,
then_val: step_acc, // Continue: 更新しない
else_val: acc_increment, // 通常: 更新
type_hint: None, // Phase 63-3
});
// 6. 末尾再帰

1
src/mir/join_ir/frontend/ast_lowerer/nested_if.rs
View File

@ -145,6 +145,7 @@ impl AstToJoinIrLowerer {
dst,
then_val: then_var,
else_val: else_var,
type_hint: None, // Phase 63-3
});
}

2
src/mir/join_ir/frontend/ast_lowerer/read_quoted.rs
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@ -403,11 +403,13 @@ impl AstToJoinIrLowerer {
dst: i_after_esc,
then_val: i_esc,
else_val: step_i,
type_hint: None, // Phase 63-3
},
MergePair {
dst: ch_merged,
then_val: ch_esc,
else_val: step_ch,
type_hint: None, // Phase 63-3
},
],
k_next: None,

7
src/mir/join_ir/json.rs
View File

@ -142,12 +142,17 @@ fn write_inst<W: Write>(inst: &JoinInst, out: &mut W) -> std::io::Result<()> {
cond,
then_val,
else_val,
type_hint,
} => {
write!(out, "{{\"type\":\"select\"")?;
write!(out, ",\"dst\":{}", dst.0)?;
write!(out, ",\"cond\":{}", cond.0)?;
write!(out, ",\"then_val\":{}", then_val.0)?;
write!(out, ",\"else_val\":{}", else_val.0)?;
// Phase 63-3: type_hint を JSON 出力（存在する場合のみ）
if let Some(ref th) = type_hint {
write!(out, ",\"type_hint\":\"{}\"", format!("{:?}", th))?;
}
write!(out, "}}")?;
}
// Phase 33-6: IfMerge instruction JSON serialization
@ -577,11 +582,13 @@ mod tests {
dst: ValueId(10),
then_val: ValueId(20),
else_val: ValueId(30),
type_hint: None, // Phase 63-3
},
MergePair {
dst: ValueId(11),
then_val: ValueId(21),
else_val: ValueId(31),
type_hint: None, // Phase 63-3
},
],
k_next: None,

1
src/mir/join_ir/lowering/if_merge.rs
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@ -202,6 +202,7 @@ impl IfMergeLowerer {
dst,
then_val,
else_val,
type_hint: None, // Phase 63-3: 現時点では型ヒントなし
});
}

33
src/mir/join_ir/lowering/if_select.rs
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@ -12,6 +12,8 @@
use crate::mir::join_ir::JoinInst;
use crate::mir::{BasicBlockId, MirFunction, MirInstruction, ValueId};
// Phase 63-2: Type hint inference from MIR
use crate::mir::{ConstValue, MirType};
// Phase 61-1: If-in-loop context support
use super::if_phi_context::IfPhiContext;
@ -118,11 +120,16 @@ impl IfSelectLowerer {
// Select 命令を生成
let dst = pattern.dst.unwrap_or(pattern.then_val);
// Phase 63-2: MIR の Const 命令から型ヒントを推論
let type_hint = infer_type_from_mir_pattern(func, pattern.then_val)
.or_else(|| infer_type_from_mir_pattern(func, pattern.else_val));
Some(JoinInst::Select {
dst,
cond: pattern.cond,
then_val: pattern.then_val,
else_val: pattern.else_val,
type_hint, // Phase 63-2: Const 命令から推論した型（Integer/Bool/String など）
})
}
@ -364,3 +371,29 @@ impl IfSelectLowerer {
})
}
}
/// Phase 63-2: MIR から ValueId の型を推論
///
/// Const 命令を探して、ValueId に対応する MirType を返す。
/// Select の then_val / else_val から型ヒントを埋めるために使用。
fn infer_type_from_mir_pattern(func: &MirFunction, val_id: ValueId) -> Option<MirType> {
// 全ブロックの全命令を走査して Const 命令を探す
for block in func.blocks.values() {
for inst in &block.instructions {
if let MirInstruction::Const { dst, value } = inst {
if *dst == val_id {
return Some(match value {
ConstValue::Integer(_) => MirType::Integer,
ConstValue::Bool(_) => MirType::Bool,
ConstValue::String(_) => MirType::String,
ConstValue::Void => MirType::Void,
ConstValue::Null => MirType::Unknown, // Null は Unknown として扱う
// Float は現状未サポート
_ => return None,
});
}
}
}
}
None
}

8
src/mir/join_ir/mod.rs
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@ -23,6 +23,8 @@
use std::collections::BTreeMap;
use crate::mir::ValueId;
// Phase 63-3: 型ヒント用
use crate::mir::MirType;
// Phase 27.9: Lowering submodule
pub mod lowering;
@ -206,6 +208,8 @@ pub struct MergePair {
pub then_val: VarId,
/// else 分岐での値
pub else_val: VarId,
/// Phase 63-3: 結果型ヒント（MIR PHI 生成時の型推論を回避）
pub type_hint: Option<MirType>,
}
/// JoinIR 命令セット（最小版）
@ -296,11 +300,15 @@ pub enum JoinInst {
/// Phase 33: If/Else の単純な値選択（単一値）
/// cond が true なら then_val、false なら else_val を dst に代入
///
/// Phase 63-3: type_hint で結果型を伝播（infer_type_from_phi 削減用）
Select {
dst: VarId,
cond: VarId,
then_val: VarId,
else_val: VarId,
/// Phase 63-3: 結果型ヒント（MIR PHI 生成時の型推論を回避）
type_hint: Option<MirType>,
},
/// Phase 33-6: If/Else の複数変数 merge

1
src/mir/join_ir/verify.rs
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@ -245,6 +245,7 @@ pub fn verify_select_minimal(
cond,
then_val,
else_val,
type_hint: _, // Phase 63-3: 検証では未使用
} = select_inst.unwrap()
else {
unreachable!()

11
src/mir/join_ir_runner.rs
View File

@ -133,6 +133,7 @@ fn execute_function(
cond,
then_val,
else_val,
type_hint: _, // Phase 63-3: 実行時は未使用
} => {
// 1. Evaluate cond (Bool or Int)
let cond_value = read_var(&locals, *cond)?;
@ -430,6 +431,7 @@ mod tests {
cond: v_cond,
then_val: v_then,
else_val: v_else,
type_hint: None, // Phase 63-3
});
// return v4
@ -481,6 +483,7 @@ mod tests {
cond: v_cond,
then_val: v_then,
else_val: v_else,
type_hint: None, // Phase 63-3
});
// return v4
@ -531,6 +534,7 @@ mod tests {
cond: v_cond,
then_val: v_then,
else_val: v_else,
type_hint: None, // Phase 63-3
});
// return v4
@ -600,11 +604,13 @@ mod tests {
dst: v_result_x,
then_val: v_then_x,
else_val: v_else_x,
type_hint: None, // Phase 63-3
},
crate::mir::join_ir::MergePair {
dst: v_result_y,
then_val: v_then_y,
else_val: v_else_y,
type_hint: None, // Phase 63-3
},
],
k_next: None,
@ -682,11 +688,13 @@ mod tests {
dst: v_result_x,
then_val: v_then_x,
else_val: v_else_x,
type_hint: None, // Phase 63-3
},
crate::mir::join_ir::MergePair {
dst: v_result_y,
then_val: v_then_y,
else_val: v_else_y,
type_hint: None, // Phase 63-3
},
],
k_next: None,
@ -771,16 +779,19 @@ mod tests {
dst: v_result_x,
then_val: v_then_x,
else_val: v_else_x,
type_hint: None, // Phase 63-3
},
crate::mir::join_ir::MergePair {
dst: v_result_y,
then_val: v_then_y,
else_val: v_else_y,
type_hint: None, // Phase 63-3
},
crate::mir::join_ir::MergePair {
dst: v_result_z,
then_val: v_then_z,
else_val: v_else_z,
type_hint: None, // Phase 63-3
},
],
k_next: None,

1
src/mir/join_ir_vm_bridge/convert.rs
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@ -491,6 +491,7 @@ Call {{\n\
cond,
then_val,
else_val,
type_hint: _, // Phase 63-3: MIR変換では現時点で未使用
} => {
// Phase 33-2: Select を MIR の if/phi に変換
// 最小実装: cond/then/else/merge の 4 ブロック構造

89
src/tests/mir_joinir_if_select.rs
View File

@ -145,6 +145,7 @@ mod tests {
cond,
then_val,
else_val,
..
}) = result
{
eprintln!("✅ Simple pattern successfully lowered to Select");
@ -171,6 +172,7 @@ mod tests {
cond,
then_val,
else_val,
..
}) = result
{
eprintln!("✅ Local pattern successfully lowered to Select");
@ -246,6 +248,7 @@ mod tests {
cond: ValueId(0),
then_val: ValueId(1),
else_val: ValueId(2),
type_hint: None, // Phase 63-3
});
// Return result
@ -270,6 +273,7 @@ mod tests {
cond: ValueId(0),
then_val: ValueId(10),
else_val: ValueId(20),
type_hint: None, // Phase 63-3
});
// Second Select (violates single PHI invariant)
@ -278,6 +282,7 @@ mod tests {
cond: ValueId(0),
then_val: ValueId(30),
else_val: ValueId(40),
type_hint: None, // Phase 63-3
});
join_func.body.push(JoinInst::Ret {
@ -591,4 +596,88 @@ mod tests {
std::env::remove_var("NYASH_JOINIR_IF_SELECT");
}
/// Phase 63-2: Helper to create a simple pattern MIR with Const instructions
fn create_simple_pattern_mir_with_const() -> MirFunction {
let mut blocks = BTreeMap::new();
// Entry block (bb0): create const 10/20, then branch on cond
let mut entry = BasicBlock::new(BasicBlockId::new(0));
entry.instructions.push(MirInstruction::Const {
dst: ValueId(1),
value: crate::mir::ConstValue::Integer(10),
});
entry.instructions.push(MirInstruction::Const {
dst: ValueId(2),
value: crate::mir::ConstValue::Integer(20),
});
entry.terminator = Some(MirInstruction::Branch {
condition: ValueId(0), // cond parameter
then_bb: BasicBlockId::new(1),
else_bb: BasicBlockId::new(2),
});
blocks.insert(BasicBlockId::new(0), entry);
// Then block (bb1): return 10
let mut then_block = BasicBlock::new(BasicBlockId::new(1));
then_block.terminator = Some(MirInstruction::Return {
value: Some(ValueId(1)), // const 10
});
blocks.insert(BasicBlockId::new(1), then_block);
// Else block (bb2): return 20
let mut else_block = BasicBlock::new(BasicBlockId::new(2));
else_block.terminator = Some(MirInstruction::Return {
value: Some(ValueId(2)), // const 20
});
blocks.insert(BasicBlockId::new(2), else_block);
use crate::mir::function::FunctionMetadata;
use crate::mir::{EffectMask, MirType};
MirFunction {
signature: crate::mir::FunctionSignature {
name: "IfSelectTest.test/1".to_string(),
params: vec![MirType::Unknown],
return_type: MirType::Integer,
effects: EffectMask::PURE,
},
entry_block: BasicBlockId::new(0),
blocks: blocks.into_iter().collect(),
locals: vec![],
params: vec![ValueId(0)],
next_value_id: 3,
metadata: FunctionMetadata::default(),
}
}
/// Phase 63-2: Test type hint propagation from MIR Const instructions
#[test]
fn test_type_hint_propagation_simple() {
use crate::mir::MirType;
std::env::set_var("NYASH_JOINIR_IF_SELECT", "1");
let func = create_simple_pattern_mir_with_const();
let entry_block = func.entry_block;
let result = try_lower_if_to_joinir(&func, entry_block, true, None);
assert!(
result.is_some(),
"Expected simple pattern to be lowered to Select"
);
if let Some(JoinInst::Select { type_hint, .. }) = result {
assert_eq!(
type_hint,
Some(MirType::Integer),
"Expected type_hint to be Some(Integer) for IfSelectTest.simple (Const 10/20)"
);
eprintln!("✅ Phase 63-2: Type hint propagation successful: {:?}", type_hint);
} else {
panic!("Expected Select instruction with type_hint");
}
std::env::remove_var("NYASH_JOINIR_IF_SELECT");
}
}