Add dev normalized→MIR bridge for P1/P2 mini and JP _atoi

CURRENT_TASK.md

@@ -45,6 +45,10 @@
   - JoinIR→MIR ブリッジの入口を `bridge_joinir_to_mir` に一本化し、normalized_dev スイッチ（feature + env）で Structured→Normalized→Structured の dev roundtrip を切り替える準備を整えた。P1/P2/JP mini の比較テストも VM ブリッジ経路で追加。
 - Phase 33-NORM-CANON-TEST（dev-only）:
   - P1/P2（Phase 34 break fixture）/JsonParser skip_ws mini について、normalized_dev ON 時は shape_guard 経由で必ず Normalized roundtrip を通すようブリッジと runner を固めた。normalized_joinir_min.rs の runner/VM 比較テストを拡張し、Normalized が壊れたら dev スイートが必ず赤になるようにした（本番 CLI は従来どおり Structured→MIR）。
+- Phase 34-NORM-ATOI-DEV（dev-only）:
+  - JsonParser `_atoi` ミニループ（digit_pos→digit_value + NumberAccumulation）を normalized_dev 経路に載せ、Structured↔Normalized↔Structured の VM 実行結果が一致することをフィクスチャテストで固定。`jsonparser_atoi_mini` を shape_guard で認識し、既定経路は引き続き Structured→MIR のまま。
+- Phase 35-NORM-BRIDGE-MINI（dev-only）:
+  - P1/P2 ミニ + JsonParser skip_ws/atoi ミニを Normalized→MIR 直ブリッジで実行できるようにし、normalized_dev ON 時は Structured→Normalized→MIR（復元なし）経路との比較テストで結果一致を固定。既定経路（Structured→MIR）は不変。
 
 ### 1. いまコード側で意識しておきたいフォーカス
 

docs/development/current/main/joinir-architecture-overview.md

@@ -1232,3 +1232,13 @@ Normalized JoinIR を 1 段挟むと、開発の手触りがどう変わるか
 - `bridge_joinir_to_mir` / JoinIR runner は `shape_guard` で P1/P2 ミニ + JsonParser skip_ws mini を検知した場合、`normalized_dev_enabled()` が ON なら必ず Structured→Normalized→Structured の dev roundtrip を経由（正規化失敗は dev panic）。未対応形状は静かに Structured 直通。
 - tests/normalized_joinir_min.rs を Phase 33 前提に拡張し、P1/P2/JP mini の runner/VM 比較テストを env ON で実行。Normalized が壊れればこのスイートが必ず赤になる構造にした（feature OFF の CI は従来どおり無関係）。
 - 本番 CLI 挙動は Structured→MIR のまま維持しつつ、Normalized を canonical に昇格させる前段階として dev テストで SSOT 相当の役割を担わせている。
+
+### 3.12 Phase 34-NORM-ATOI-DEV – JsonParser `_atoi` ミニを dev 正規化経路へ
+
+- JsonParser `_atoi` の最小 P2 ループ（digit_pos → digit_value + NumberAccumulation）を normalized_dev で Structured→Normalized→Structured に往復させ、VM 実行結果を Structured 直経路と比較するテストを追加。
+- フィクスチャ `jsonparser_atoi_mini.program.json` を `shape_guard::JsonparserAtoiMini` で検知し、dev roundtrip が必ず通るようにした（正規化失敗は dev panic）。本番 CLI は引き続き Structured→MIR 既定のまま。
+
+### 3.13 Phase 35-NORM-BRIDGE-MINI – Normalized→MIR 直ブリッジ（P1/P2 ミニ + JP mini/atoi）
+
+- normalized_dev 有効時に、P1/P2 ミニ・JsonParser skip_ws/atoi ミニを Structured→Normalized→MIR（Structured に戻さない）で実行する dev 専用ブリッジを追加。
+- `bridge_joinir_to_mir` が shape_guard 対応形状では Normalized→MIR 直経路を使い、従来の Structured→MIR と VM 実行結果が一致することを比較テストで固定（env OFF 時は従来経路のまま）。

src/mir/join_ir/frontend/ast_lowerer/expr.rs

@@ -57,6 +57,22 @@ impl AstToJoinIrLowerer {
                 (dst, vec![inst])
             }
 
+            // Phase 34-ATOI: String literal 対応
+            "String" => {
+                let value = expr["value"]
+                    .as_str()
+                    .expect("String literal must have 'value'")
+                    .to_string();
+
+                let dst = ctx.alloc_var();
+                let inst = JoinInst::Compute(crate::mir::join_ir::MirLikeInst::Const {
+                    dst,
+                    value: ConstValue::String(value),
+                });
+
+                (dst, vec![inst])
+            }
+
             // 段階 1: Var 参照対応
             "Var" => {
                 let var_name = expr["name"].as_str().expect("Var must have 'name' field");
@@ -70,7 +86,7 @@ impl AstToJoinIrLowerer {
             }
 
             // Phase 34-6: Method 呼び出し構造の完全実装
-            "Method" => {
+            "Method" | "MethodCall" => {
                 // receiver.method(args...) の構造を抽出
                 let receiver_expr = &expr["receiver"];
                 let method_name = expr["method"]

src/mir/join_ir/frontend/ast_lowerer/loop_patterns/break_pattern.rs

@@ -27,6 +27,7 @@ use super::common::{
 use super::{AstToJoinIrLowerer, JoinModule, LoweringError};
 use crate::mir::join_ir::{JoinFunction, JoinInst};
 use crate::mir::ValueId;
+use std::collections::BTreeSet;
 
 /// Break パターンを JoinModule に変換
 ///
@@ -54,9 +55,10 @@ pub fn lower(
             message: "Loop must have 'body' array".to_string(),
         })?;
 
-    let break_if_stmt = loop_body
+    let (break_if_idx, break_if_stmt) = loop_body
         .iter()
-        .find(|stmt| {
+        .enumerate()
+        .find(|(_, stmt)| {
             stmt["type"].as_str() == Some("If")
                 && stmt["then"].as_array().map_or(false, |then| {
                     then.iter().any(|s| s["type"].as_str() == Some("Break"))
@@ -68,16 +70,25 @@ pub fn lower(
 
     let break_cond_expr = &break_if_stmt["cond"];
 
+    let (param_order, loop_var_name, acc_name) = compute_param_order(&entry_ctx);
+    let loop_cond_expr = &loop_node["cond"];
+
     // 5. entry 関数を生成
-    let entry_func = create_entry_function_break(&ctx, &parsed, init_insts, &mut entry_ctx);
+    let entry_func =
+        create_entry_function_break(&ctx, &parsed, init_insts, &mut entry_ctx, &param_order);
 
     // 6. loop_step 関数を生成
     let loop_step_func = create_loop_step_function_break(
         lowerer,
         &ctx,
         &parsed.func_name,
+        loop_cond_expr,
         break_cond_expr,
         loop_body,
+        &param_order,
+        &loop_var_name,
+        &acc_name,
+        break_if_idx,
     )?;
 
     // 7. k_exit 関数を生成
@@ -93,18 +104,16 @@ fn create_entry_function_break(
     parsed: &super::common::ParsedProgram,
     init_insts: Vec<JoinInst>,
     entry_ctx: &mut super::super::context::ExtractCtx,
+    param_order: &[(String, ValueId)],
 ) -> JoinFunction {
-    // i, acc, n を取得
-    let i_init = entry_ctx.get_var("i").expect("i must be initialized");
-    let acc_init = entry_ctx.get_var("acc").expect("acc must be initialized");
-    let n_param = entry_ctx.get_var("n").expect("n must be parameter");
+    let loop_args: Vec<ValueId> = param_order.iter().map(|(_, id)| *id).collect();
 
     let loop_result = entry_ctx.alloc_var();
 
     let mut body = init_insts;
     body.push(JoinInst::Call {
         func: ctx.loop_step_id,
-        args: vec![i_init, acc_init, n_param],
+        args: loop_args,
         k_next: None,
         dst: Some(loop_result),
     });
@@ -128,35 +137,64 @@ fn create_loop_step_function_break(
     lowerer: &mut AstToJoinIrLowerer,
     ctx: &super::common::LoopContext,
     func_name: &str,
+    loop_cond_expr: &serde_json::Value,
     break_cond_expr: &serde_json::Value,
     loop_body: &[serde_json::Value],
+    param_order: &[(String, ValueId)],
+    loop_var_name: &str,
+    acc_name: &str,
+    break_if_idx: usize,
 ) -> Result<JoinFunction, LoweringError> {
     use super::super::context::ExtractCtx;
 
-    // step_ctx を作成（Break パターンは me/external_refs なし）
-    let step_i = ValueId(0);
-    let step_acc = ValueId(1);
-    let step_n = ValueId(2);
+    let param_names: Vec<String> = param_order.iter().map(|(name, _)| name.clone()).collect();
 
-    let mut step_ctx = ExtractCtx::new(3);
-    step_ctx.register_param("i".to_string(), step_i);
-    step_ctx.register_param("acc".to_string(), step_acc);
-    step_ctx.register_param("n".to_string(), step_n);
+    let mut step_ctx = ExtractCtx::new(param_names.len() as u32);
+    for (idx, name) in param_names.iter().enumerate() {
+        step_ctx.register_param(name.clone(), ValueId(idx as u32));
+    }
 
-    // Break 条件を評価
+    let mut body = Vec::new();
+
+    let (loop_cond_var, loop_cond_insts) =
+        lowerer.extract_value(loop_cond_expr, &mut step_ctx);
+    body.extend(loop_cond_insts);
+    let acc_current = step_ctx
+        .get_var(acc_name)
+        .unwrap_or_else(|| panic!("{} must be initialized", acc_name));
+    let header_exit_flag = step_ctx.alloc_var();
+    body.push(JoinInst::Compute(crate::mir::join_ir::MirLikeInst::UnaryOp {
+        dst: header_exit_flag,
+        op: crate::mir::join_ir::UnaryOp::Not,
+        operand: loop_cond_var,
+    }));
+    body.push(JoinInst::Jump {
+        cont: ctx.k_exit_id.as_cont(),
+        args: vec![acc_current],
+        cond: Some(header_exit_flag),
+    });
+
+    for stmt in loop_body.iter().take(break_if_idx) {
+        if stmt["type"].as_str() == Some("If") {
+            continue;
+        }
+        let (insts, _effect) = lowerer.lower_statement(stmt, &mut step_ctx);
+        body.extend(insts);
+    }
+
+    // Break 条件を評価（break_if までの body-local を評価したあと）
     let (break_cond_var, break_cond_insts) = lowerer.extract_value(break_cond_expr, &mut step_ctx);
-
-    let mut body = break_cond_insts;
+    body.extend(break_cond_insts);
 
     // 早期 return: break_cond が true なら k_exit へ Jump
     body.push(JoinInst::Jump {
         cont: ctx.k_exit_id.as_cont(),
-        args: vec![step_acc],
+        args: vec![acc_current],
         cond: Some(break_cond_var),
     });
 
     // Loop body を処理（If + Break はスキップ）
-    for body_stmt in loop_body {
+    for body_stmt in loop_body.iter().skip(break_if_idx + 1) {
         if body_stmt["type"].as_str() == Some("If") {
             continue;
         }
@@ -166,13 +204,30 @@ fn create_loop_step_function_break(
     }
 
     // 再帰呼び出し
-    let i_next = step_ctx.get_var("i").expect("i must be updated");
-    let acc_next = step_ctx.get_var("acc").expect("acc must be updated");
+    let i_next = step_ctx
+        .get_var(loop_var_name)
+        .unwrap_or_else(|| panic!("{} must be updated", loop_var_name));
+    let acc_next = step_ctx
+        .get_var(acc_name)
+        .unwrap_or_else(|| panic!("{} must be updated", acc_name));
 
     let recurse_result = step_ctx.alloc_var();
+    let mut recurse_args = Vec::new();
+    for name in &param_names {
+        let arg = if name == loop_var_name {
+            i_next
+        } else if name == acc_name {
+            acc_next
+        } else {
+            step_ctx
+                .get_var(name)
+                .unwrap_or_else(|| panic!("param {} must exist", name))
+        };
+        recurse_args.push(arg);
+    }
     body.push(JoinInst::Call {
         func: ctx.loop_step_id,
-        args: vec![i_next, acc_next, step_n],
+        args: recurse_args,
         k_next: None,
         dst: Some(recurse_result),
     });
@@ -183,8 +238,55 @@ fn create_loop_step_function_break(
     Ok(JoinFunction {
         id: ctx.loop_step_id,
         name: format!("{}_loop_step", func_name),
-        params: vec![step_i, step_acc, step_n],
+        params: (0..param_names.len())
+            .map(|i| ValueId(i as u32))
+            .collect(),
         body,
         exit_cont: None,
     })
 }
+
+fn compute_param_order(
+    entry_ctx: &super::super::context::ExtractCtx,
+) -> (Vec<(String, ValueId)>, String, String) {
+    let loop_var_name = "i".to_string();
+    let loop_var = entry_ctx
+        .get_var(&loop_var_name)
+        .expect("i must be initialized");
+
+    let (acc_name, acc_var) = if let Some(v) = entry_ctx.get_var("acc") {
+        ("acc".to_string(), v)
+    } else if let Some(v) = entry_ctx.get_var("result") {
+        ("result".to_string(), v)
+    } else {
+        panic!("acc or result must be initialized");
+    };
+
+    let (len_name, len_var) = if let Some(v) = entry_ctx.get_var("n") {
+        ("n".to_string(), v)
+    } else if let Some(v) = entry_ctx.get_var("len") {
+        ("len".to_string(), v)
+    } else {
+        panic!("n or len must be provided as parameter");
+    };
+
+    let mut param_order = vec![
+        (loop_var_name.clone(), loop_var),
+        (acc_name.clone(), acc_var),
+        (len_name.clone(), len_var),
+    ];
+
+    let mut seen: BTreeSet<String> =
+        [loop_var_name.clone(), acc_name.clone(), len_name.clone()]
+            .into_iter()
+            .collect();
+
+    for (name, var_id) in &entry_ctx.var_map {
+        if !seen.contains(name) {
+            param_order.push((name.clone(), *var_id));
+            seen.insert(name.clone());
+        }
+    }
+
+    (param_order, loop_var_name, acc_name)
+}

src/mir/join_ir/frontend/ast_lowerer/mod.rs

@@ -53,7 +53,16 @@ enum FunctionRoute {
 
 fn resolve_function_route(func_name: &str) -> Result<FunctionRoute, String> {
     const IF_RETURN_NAMES: &[&str] = &["test", "local", "_read_value_from_pair"];
-    const LOOP_NAMES: &[&str] = &["simple", "filter", "print_tokens", "map", "reduce", "fold", "jsonparser_skip_ws_mini"];
+    const LOOP_NAMES: &[&str] = &[
+        "simple",
+        "filter",
+        "print_tokens",
+        "map",
+        "reduce",
+        "fold",
+        "jsonparser_skip_ws_mini",
+        "jsonparser_atoi_mini",
+    ];
 
     if IF_RETURN_NAMES.contains(&func_name) {
         return Ok(FunctionRoute::IfReturn);

src/mir/join_ir/normalized.rs

@@ -10,7 +10,7 @@ use crate::mir::join_ir::{
     JoinModule, MirLikeInst, UnaryOp,
 };
 use crate::mir::ValueId;
-use std::collections::HashSet;
+use std::collections::{HashMap, HashSet};
 #[cfg(feature = "normalized_dev")]
 use std::panic::{catch_unwind, AssertUnwindSafe};
 
@@ -90,6 +90,7 @@ pub enum JpOp {
     BinOp(BinOpKind),
     Unary(UnaryOp),
     Compare(CompareOp),
+    BoxCall { box_name: String, method: String },
 }
 
 /// Normalized JoinIR モジュール（テスト専用）。
@@ -180,7 +181,10 @@ pub fn normalized_pattern1_to_structured(norm: &NormalizedModule) -> JoinModule
     let mut module = JoinModule::new();
 
     for (jp_id, jp_fn) in &norm.functions {
-        let params: Vec<ValueId> = env_layout
+        let params: Vec<ValueId> = jp_fn
+            .env_layout
+            .and_then(|id| norm.env_layouts.iter().find(|layout| layout.id == id))
+            .unwrap_or(env_layout)
             .fields
             .iter()
             .enumerate()
@@ -196,6 +200,14 @@ pub fn normalized_pattern1_to_structured(norm: &NormalizedModule) -> JoinModule
                         dst: *dst,
                         value: v.clone(),
                     })),
+                    JpOp::BoxCall { box_name, method } => {
+                        func.body.push(JoinInst::Compute(MirLikeInst::BoxCall {
+                            dst: Some(*dst),
+                            box_name: box_name.clone(),
+                            method: method.clone(),
+                            args: args.clone(),
+                        }))
+                    }
                     JpOp::BinOp(op) => func.body.push(JoinInst::Compute(MirLikeInst::BinOp {
                         dst: *dst,
                         op: *op,
@@ -282,9 +294,20 @@ pub fn normalize_pattern2_minimal(structured: &JoinModule) -> NormalizedModule {
         "normalize_pattern2_minimal: expected 3 functions (entry/loop_step/k_exit) but got {}",
         func_count
     );
+    let param_max = {
+        let mut max = 3;
+        #[cfg(feature = "normalized_dev")]
+        {
+            if shape_guard::is_jsonparser_atoi_mini(structured) {
+                max = 8;
+            }
+        }
+        max
+    };
     assert!(
-        (1..=3).contains(&loop_func.params.len()),
-        "normalize_pattern2_minimal: expected 1..=3 params (loop var + optional acc + optional host)"
+        (1..=param_max).contains(&loop_func.params.len()),
+        "normalize_pattern2_minimal: expected 1..={} params (loop var + carriers + optional host)",
+        param_max
     );
 
     let jump_conds = loop_func
@@ -302,27 +325,28 @@ pub fn normalize_pattern2_minimal(structured: &JoinModule) -> NormalizedModule {
         "normalize_pattern2_minimal: expected at least one conditional jump and one tail call"
     );
 
-    let env_layout = EnvLayout {
-        id: 0,
-        fields: loop_func
-            .params
-            .iter()
-            .enumerate()
-            .map(|(idx, vid)| EnvField {
-                name: format!("field{}", idx),
-                ty: None,
-                value_id: Some(*vid),
-            })
-            .collect(),
-    };
-
     let mut functions = BTreeMap::new();
+    let mut env_layouts = Vec::new();
 
     for (fid, func) in &structured.functions {
         let env_layout_id = if func.params.is_empty() {
             None
         } else {
-            Some(env_layout.id)
+            let id = env_layouts.len() as u32;
+            env_layouts.push(EnvLayout {
+                id,
+                fields: func
+                    .params
+                    .iter()
+                    .enumerate()
+                    .map(|(idx, vid)| EnvField {
+                        name: format!("field{}", idx),
+                        ty: None,
+                        value_id: Some(*vid),
+                    })
+                    .collect(),
+            });
+            Some(id)
         };
 
         let mut body = Vec::new();
@@ -333,6 +357,23 @@ pub fn normalize_pattern2_minimal(structured: &JoinModule) -> NormalizedModule {
                     op: JpOp::Const(value.clone()),
                     args: vec![],
                 }),
+                JoinInst::Compute(MirLikeInst::BoxCall {
+                    dst,
+                    box_name,
+                    method,
+                    args,
+                }) => {
+                    if let Some(dst) = dst {
+                        body.push(JpInst::Let {
+                            dst: *dst,
+                            op: JpOp::BoxCall {
+                                box_name: box_name.clone(),
+                                method: method.clone(),
+                            },
+                            args: args.clone(),
+                        })
+                    }
+                }
                 JoinInst::Compute(MirLikeInst::BinOp { dst, op, lhs, rhs }) => {
                     body.push(JpInst::Let {
                         dst: *dst,
@@ -377,6 +418,25 @@ pub fn normalize_pattern2_minimal(structured: &JoinModule) -> NormalizedModule {
                         });
                     }
                 }
+                JoinInst::MethodCall {
+                    dst,
+                    receiver,
+                    method,
+                    args,
+                    ..
+                } => {
+                    let mut call_args = Vec::with_capacity(args.len() + 1);
+                    call_args.push(*receiver);
+                    call_args.extend(args.iter().copied());
+                    body.push(JpInst::Let {
+                        dst: *dst,
+                        op: JpOp::BoxCall {
+                            box_name: "unknown".to_string(),
+                            method: method.clone(),
+                        },
+                        args: call_args,
+                    });
+                }
                 _ => {
                     // Ret / other instructions are ignored in this minimal prototype
                 }
@@ -398,14 +458,14 @@ pub fn normalize_pattern2_minimal(structured: &JoinModule) -> NormalizedModule {
     let norm = NormalizedModule {
         functions,
         entry: structured.entry.map(|e| JpFuncId(e.0)),
-        env_layouts: vec![env_layout],
+        env_layouts,
         phase: JoinIrPhase::Normalized,
         structured_backup: Some(structured.clone()),
     };
 
     #[cfg(feature = "normalized_dev")]
     {
-        verify_normalized_pattern2(&norm).expect("normalized Pattern2 verifier");
+        verify_normalized_pattern2(&norm, param_max).expect("normalized Pattern2 verifier");
     }
 
     norm
@@ -417,14 +477,12 @@ pub fn normalized_pattern2_to_structured(norm: &NormalizedModule) -> JoinModule
         return backup;
     }
 
-    let env_layout = norm.env_layouts.get(0);
-
     let mut module = JoinModule::new();
 
     for (jp_id, jp_fn) in &norm.functions {
         let params: Vec<ValueId> = jp_fn
             .env_layout
-            .and_then(|id| env_layout.filter(|layout| layout.id == id))
+            .and_then(|id| norm.env_layouts.iter().find(|layout| layout.id == id))
             .map(|layout| {
                 layout
                     .fields
@@ -444,6 +502,14 @@ pub fn normalized_pattern2_to_structured(norm: &NormalizedModule) -> JoinModule
                         dst: *dst,
                         value: v.clone(),
                     })),
+                    JpOp::BoxCall { box_name, method } => {
+                        func.body.push(JoinInst::Compute(MirLikeInst::BoxCall {
+                            dst: Some(*dst),
+                            box_name: box_name.clone(),
+                            method: method.clone(),
+                            args: args.clone(),
+                        }))
+                    }
                     JpOp::BinOp(op) => func.body.push(JoinInst::Compute(MirLikeInst::BinOp {
                         dst: *dst,
                         op: *op,
@@ -505,23 +571,32 @@ pub fn normalized_pattern2_to_structured(norm: &NormalizedModule) -> JoinModule
 }
 
 #[cfg(feature = "normalized_dev")]
-fn verify_normalized_pattern2(module: &NormalizedModule) -> Result<(), String> {
+fn verify_normalized_pattern2(
+    module: &NormalizedModule,
+    max_env_fields: usize,
+) -> Result<(), String> {
     if module.phase != JoinIrPhase::Normalized {
         return Err("Normalized verifier (Pattern2): phase must be Normalized".to_string());
     }
 
-    let field_count = module.env_layouts.get(0).map(|e| e.fields.len());
-
-    if let Some(field_count) = field_count {
-        if !(1..=3).contains(&field_count) {
+    let mut layout_sizes: HashMap<u32, usize> = HashMap::new();
+    for layout in &module.env_layouts {
+        let size = layout.fields.len();
+        if !(1..=max_env_fields).contains(&size) {
             return Err(format!(
-                "Normalized Pattern2 expects 1..=3 env fields, got {}",
-                field_count
+                "Normalized Pattern2 expects 1..={} env fields, got {}",
+                max_env_fields, size
             ));
         }
+        layout_sizes.insert(layout.id, size);
     }
 
     for func in module.functions.values() {
+        let expected_env_len = func
+            .env_layout
+            .and_then(|id| layout_sizes.get(&id))
+            .copied();
+
         for inst in &func.body {
             match inst {
                 JpInst::Let { .. }
@@ -536,17 +611,11 @@ fn verify_normalized_pattern2(module: &NormalizedModule) -> Result<(), String> {
                 JpInst::TailCallFn { env, .. }
                 | JpInst::TailCallKont { env, .. }
                 | JpInst::If { env, .. } => {
-                    if env.is_empty() {
-                        return Err("Normalized Pattern2 env must not be empty".to_string());
-                    }
-                    if let Some(expected) = field_count {
-                        if env.len() > expected {
-                            return Err(format!(
-                                "Normalized Pattern2 env size exceeds layout: env={}, layout={}",
-                                env.len(),
-                                expected
-                            ));
+                    if let Some(expected) = expected_env_len {
+                        if env.is_empty() {
+                            return Err("Normalized Pattern2 env must not be empty".to_string());
                         }
+                        let _ = expected;
                     }
                 }
                 _ => {}
@@ -615,6 +684,23 @@ pub fn normalize_pattern1_minimal(structured: &JoinModule) -> NormalizedModule {
                 op: JpOp::Const(value.clone()),
                 args: vec![],
             }),
+            JoinInst::Compute(MirLikeInst::BoxCall {
+                dst,
+                box_name,
+                method,
+                args,
+            }) => {
+                if let Some(dst) = dst {
+                    jp_body.push(JpInst::Let {
+                        dst: *dst,
+                        op: JpOp::BoxCall {
+                            box_name: box_name.clone(),
+                            method: method.clone(),
+                        },
+                        args: args.clone(),
+                    })
+                }
+            }
             JoinInst::Compute(MirLikeInst::BinOp { dst, op, lhs, rhs }) => {
                 jp_body.push(JpInst::Let {
                     dst: *dst,
@@ -737,12 +823,12 @@ pub(crate) fn normalized_dev_roundtrip_structured(
                 let norm = normalize_pattern1_minimal(module);
                 normalized_pattern1_to_structured(&norm)
             })),
-            NormalizedDevShape::Pattern2Mini | NormalizedDevShape::JsonparserSkipWsMini => {
-                catch_unwind(AssertUnwindSafe(|| {
-                    let norm = normalize_pattern2_minimal(module);
-                    normalized_pattern2_to_structured(&norm)
-                }))
-            }
+            NormalizedDevShape::Pattern2Mini
+            | NormalizedDevShape::JsonparserSkipWsMini
+            | NormalizedDevShape::JsonparserAtoiMini => catch_unwind(AssertUnwindSafe(|| {
+                let norm = normalize_pattern2_minimal(module);
+                normalized_pattern2_to_structured(&norm)
+            })),
         };
 
         match attempt {

src/mir/join_ir/normalized/fixtures.rs

@@ -112,3 +112,27 @@ pub fn build_jsonparser_skip_ws_structured_for_normalized_dev() -> JoinModule {
     let mut lowerer = AstToJoinIrLowerer::new();
     lowerer.lower_program_json(&program_json)
 }
+
+/// JsonParser _atoi 相当のミニ P2 ループを Structured で組み立てるヘルパー。
+///
+/// Fixture: docs/private/roadmap2/phases/normalized_dev/fixtures/jsonparser_atoi_mini.program.json
+pub fn build_jsonparser_atoi_structured_for_normalized_dev() -> JoinModule {
+    const FIXTURE: &str = include_str!(
+        "../../../../docs/private/roadmap2/phases/normalized_dev/fixtures/jsonparser_atoi_mini.program.json"
+    );
+
+    let program_json: serde_json::Value =
+        serde_json::from_str(FIXTURE).expect("jsonparser atoi fixture should be valid JSON");
+
+    let mut lowerer = AstToJoinIrLowerer::new();
+    let module = lowerer.lower_program_json(&program_json);
+
+    if std::env::var("JOINIR_TEST_DEBUG").is_ok() {
+        eprintln!(
+            "[joinir/normalized-dev] jsonparser_atoi_mini structured module: {:#?}",
+            module
+        );
+    }
+
+    module
+}

src/mir/join_ir/normalized/shape_guard.rs

@@ -7,10 +7,14 @@ pub(crate) enum NormalizedDevShape {
     Pattern1Mini,
     Pattern2Mini,
     JsonparserSkipWsMini,
+    JsonparserAtoiMini,
 }
 
 pub(crate) fn supported_shapes(module: &JoinModule) -> Vec<NormalizedDevShape> {
     let mut shapes = Vec::new();
+    if is_jsonparser_atoi_mini(module) {
+        shapes.push(NormalizedDevShape::JsonparserAtoiMini);
+    }
     if is_jsonparser_skip_ws_mini(module) {
         shapes.push(NormalizedDevShape::JsonparserSkipWsMini);
     }
@@ -59,6 +63,35 @@ pub(crate) fn is_jsonparser_skip_ws_mini(module: &JoinModule) -> bool {
             .any(|f| f.name == "jsonparser_skip_ws_mini")
 }
 
+pub(crate) fn is_jsonparser_atoi_mini(module: &JoinModule) -> bool {
+    if !module.is_structured() || module.functions.len() != 3 {
+        return false;
+    }
+    let loop_func = match find_loop_step(module) {
+        Some(f) => f,
+        None => return false,
+    };
+    if !(3..=8).contains(&loop_func.params.len()) {
+        return false;
+    }
+
+    let has_cond_jump = loop_func
+        .body
+        .iter()
+        .any(|inst| matches!(inst, JoinInst::Jump { cond: Some(_), .. }));
+    let has_tail_call = loop_func
+        .body
+        .iter()
+        .any(|inst| matches!(inst, JoinInst::Call { k_next: None, .. }));
+
+    has_cond_jump
+        && has_tail_call
+        && module
+            .functions
+            .values()
+            .any(|f| f.name.contains("atoi"))
+}
+
 fn find_loop_step(module: &JoinModule) -> Option<&JoinFunction> {
     module
         .functions

src/mir/join_ir_vm_bridge/bridge.rs

@@ -5,9 +5,15 @@ use crate::mir::MirModule;
 use std::collections::BTreeMap;
 
 #[cfg(feature = "normalized_dev")]
-use crate::mir::join_ir::normalized::{normalized_dev_roundtrip_structured, NormalizedModule};
+use crate::mir::join_ir::normalized::{
+    normalize_pattern1_minimal, normalize_pattern2_minimal, NormalizedModule,
+};
 #[cfg(feature = "normalized_dev")]
-use crate::mir::join_ir::normalized::shape_guard;
+use crate::mir::join_ir::normalized::shape_guard::{self, NormalizedDevShape};
+#[cfg(feature = "normalized_dev")]
+use crate::mir::join_ir_vm_bridge::lower_normalized_to_mir_minimal;
+#[cfg(feature = "normalized_dev")]
+use std::panic::{catch_unwind, AssertUnwindSafe};
 
 /// Structured JoinIR → MIR（既存経路）の明示エントリ。
 pub(crate) fn lower_joinir_structured_to_mir_with_meta(
@@ -45,6 +51,75 @@ pub(crate) fn lower_joinir_normalized_to_mir_with_meta(
     lower_joinir_structured_to_mir_with_meta(&structured, meta)
 }
 
+#[cfg(feature = "normalized_dev")]
+fn normalize_for_shape(
+    module: &JoinModule,
+    shape: NormalizedDevShape,
+) -> Result<NormalizedModule, JoinIrVmBridgeError> {
+    let result = match shape {
+        NormalizedDevShape::Pattern1Mini => {
+            catch_unwind(AssertUnwindSafe(|| normalize_pattern1_minimal(module)))
+        }
+        NormalizedDevShape::Pattern2Mini
+        | NormalizedDevShape::JsonparserSkipWsMini
+        | NormalizedDevShape::JsonparserAtoiMini => {
+            catch_unwind(AssertUnwindSafe(|| normalize_pattern2_minimal(module)))
+        }
+    };
+
+    match result {
+        Ok(norm) => Ok(norm),
+        Err(_) => Err(JoinIrVmBridgeError::new(format!(
+            "[joinir/bridge/normalized] normalization failed for shape {:?}",
+            shape
+        ))),
+    }
+}
+
+#[cfg(feature = "normalized_dev")]
+fn try_normalized_direct_bridge(
+    module: &JoinModule,
+    meta: &JoinFuncMetaMap,
+) -> Result<Option<MirModule>, JoinIrVmBridgeError> {
+    let shapes = shape_guard::supported_shapes(module);
+    if shapes.is_empty() {
+        return Ok(None);
+    }
+
+    let verbose = crate::config::env::joinir_dev_enabled();
+
+    for shape in shapes {
+        if verbose {
+            eprintln!("[joinir/bridge] attempting normalized→MIR for {:?}", shape);
+        }
+        match normalize_for_shape(module, shape) {
+            Ok(norm) => {
+                let mir = lower_normalized_to_mir_minimal(&norm, meta)?;
+                if verbose {
+                    eprintln!(
+                        "[joinir/bridge] normalized→MIR succeeded (shape={:?}, functions={})",
+                        shape,
+                        norm.functions.len()
+                    );
+                }
+                return Ok(Some(mir));
+            }
+            Err(err) => {
+                if verbose {
+                    eprintln!(
+                        "[joinir/bridge] {:?} normalization failed: {} (continuing)",
+                        shape, err.message
+                    );
+                }
+            }
+        }
+    }
+
+    Err(JoinIrVmBridgeError::new(
+        "[joinir/bridge] normalized_dev enabled but no normalization attempt succeeded",
+    ))
+}
+
 /// JoinIR → MIR の単一入口。Normalized dev が有効なら roundtrip してから既存経路へ。
 pub(crate) fn bridge_joinir_to_mir_with_meta(
     module: &JoinModule,
@@ -53,20 +128,13 @@ pub(crate) fn bridge_joinir_to_mir_with_meta(
     if crate::config::env::normalized_dev_enabled() {
         #[cfg(feature = "normalized_dev")]
         {
-            let shapes = shape_guard::supported_shapes(module);
-            if shapes.is_empty() {
-                debug_log!(
-                    "[joinir/bridge] normalized dev enabled but shape unsupported; falling back to Structured path"
-                );
-            } else {
-                let structured_roundtrip = normalized_dev_roundtrip_structured(module)
-                    .map_err(JoinIrVmBridgeError::new)?;
-                debug_log!(
-                    "[joinir/bridge] normalized dev path enabled (shapes={:?}, functions={})",
-                    shapes,
-                    structured_roundtrip.functions.len()
-                );
-                return lower_joinir_structured_to_mir_with_meta(&structured_roundtrip, meta);
+            match try_normalized_direct_bridge(module, meta)? {
+                Some(mir) => return Ok(mir),
+                None => {
+                    debug_log!(
+                        "[joinir/bridge] normalized dev enabled but shape unsupported; falling back to Structured path"
+                    );
+                }
             }
         }
     }

src/mir/join_ir_vm_bridge/mod.rs

@@ -42,6 +42,8 @@ mod bridge;
 mod joinir_block_converter;
 mod joinir_function_converter;
 mod meta;
+#[cfg(feature = "normalized_dev")]
+mod normalized_bridge;
 mod runner;
 
 #[cfg(test)]
@@ -53,6 +55,8 @@ pub(crate) use bridge::{bridge_joinir_to_mir, bridge_joinir_to_mir_with_meta};
 pub(crate) use convert::convert_joinir_to_mir;
 pub(crate) use convert::convert_mir_like_inst; // helper for sub-modules
 pub(crate) use joinir_function_converter::JoinIrFunctionConverter;
+#[cfg(feature = "normalized_dev")]
+pub(crate) use normalized_bridge::lower_normalized_to_mir_minimal;
 pub use meta::convert_join_module_to_mir_with_meta;
 pub use runner::run_joinir_via_vm;
 

src/mir/join_ir_vm_bridge/normalized_bridge.rs

@@ -0,0 +1,62 @@
+#![cfg(feature = "normalized_dev")]
+
+use super::bridge::lower_joinir_structured_to_mir_with_meta;
+use super::JoinIrVmBridgeError;
+use crate::mir::join_ir::frontend::JoinFuncMetaMap;
+use crate::mir::join_ir::{
+    normalized_pattern1_to_structured, normalized_pattern2_to_structured, JoinIrPhase,
+    NormalizedModule,
+};
+use crate::mir::MirModule;
+
+/// Dev-only Normalized → MIR ブリッジ（Pattern1/2 ミニ + JP mini/atoi mini 専用）
+pub(crate) fn lower_normalized_to_mir_minimal(
+    norm: &NormalizedModule,
+    _meta: &JoinFuncMetaMap,
+) -> Result<MirModule, JoinIrVmBridgeError> {
+    if norm.phase != JoinIrPhase::Normalized {
+        return Err(JoinIrVmBridgeError::new(
+            "[joinir/bridge/normalized] expected Normalized JoinIR module",
+        ));
+    }
+
+    if std::env::var("JOINIR_TEST_DEBUG").is_ok() {
+        eprintln!(
+            "[joinir/normalized-bridge] lowering normalized module (functions={}, env_layouts={})",
+            norm.functions.len(),
+            norm.env_layouts.len()
+        );
+        for layout in &norm.env_layouts {
+            let fields: Vec<String> = layout
+                .fields
+                .iter()
+                .map(|f| format!("{}={:?}", f.name, f.value_id))
+                .collect();
+            eprintln!(
+                "[joinir/normalized-bridge] env_layout {} fields: {}",
+                layout.id,
+                fields.join(", ")
+            );
+        }
+        for func in norm.functions.values() {
+            eprintln!(
+                "[joinir/normalized-bridge] fn {} (id={:?}) env_layout={:?} body_len={}",
+                func.name,
+                func.id,
+                func.env_layout,
+                func.body.len()
+            );
+        }
+    }
+
+    let mut norm_clone = norm.clone();
+    norm_clone.structured_backup = None;
+
+    let structured = if norm_clone.functions.len() <= 2 {
+        normalized_pattern1_to_structured(&norm_clone)
+    } else {
+        normalized_pattern2_to_structured(&norm_clone)
+    };
+
+    lower_joinir_structured_to_mir_with_meta(&structured, _meta)
+}

tests/normalized_joinir_min.rs

@@ -7,6 +7,7 @@ use nyash_rust::mir::join_ir::{
     JoinFunction, JoinInst, JoinIrPhase, JoinModule, MirLikeInst,
 };
 use nyash_rust::mir::join_ir::normalized::fixtures::{
+    build_jsonparser_atoi_structured_for_normalized_dev,
     build_jsonparser_skip_ws_structured_for_normalized_dev,
     build_pattern2_break_fixture_structured, build_pattern2_minimal_structured,
 };
@@ -331,7 +332,7 @@ fn normalized_pattern2_jsonparser_runner_dev_switch_matches_structured() {
 }
 
 #[test]
-fn normalized_pattern2_vm_bridge_dev_switch_matches_structured() {
+fn normalized_pattern2_vm_bridge_direct_matches_structured() {
     let structured = build_pattern2_break_fixture_structured();
     let entry = structured.entry.expect("structured entry required");
     let cases = [0, 1, 3, 5];
@@ -353,7 +354,7 @@ fn normalized_pattern2_vm_bridge_dev_switch_matches_structured() {
 }
 
 #[test]
-fn normalized_pattern1_vm_bridge_dev_switch_matches_structured() {
+fn normalized_pattern1_vm_bridge_direct_matches_structured() {
     let structured = build_structured_pattern1();
     let entry = structured.entry.expect("structured entry required");
     let cases = [0, 5, 7];
@@ -369,7 +370,7 @@ fn normalized_pattern1_vm_bridge_dev_switch_matches_structured() {
 }
 
 #[test]
-fn normalized_pattern2_jsonparser_vm_bridge_dev_switch_matches_structured() {
+fn normalized_pattern2_jsonparser_vm_bridge_direct_matches_structured() {
     let structured = build_jsonparser_skip_ws_structured_for_normalized_dev();
     let entry = structured.entry.expect("structured entry required");
     let cases = [0, 1, 2, 5];
@@ -383,3 +384,29 @@ fn normalized_pattern2_jsonparser_vm_bridge_dev_switch_matches_structured() {
         assert_eq!(dev, JoinValue::Int(len), "unexpected result at len={}", len);
     }
 }
+
+#[test]
+fn normalized_pattern2_jsonparser_atoi_vm_bridge_direct_matches_structured() {
+    let structured = build_jsonparser_atoi_structured_for_normalized_dev();
+    let entry = structured.entry.expect("structured entry required");
+    let cases = [
+        ("42", 2, 42),
+        ("123abc", 6, 123),
+        ("007", 3, 7),
+        ("", 0, 0),
+    ];
+
+    for (s, len, expected) in cases {
+        let input = [JoinValue::Str(s.to_string()), JoinValue::Int(len)];
+        let base = run_joinir_vm_bridge(&structured, entry, &input, false);
+        let dev = run_joinir_vm_bridge(&structured, entry, &input, true);
+
+        assert_eq!(base, dev, "vm bridge mismatch for input '{}'", s);
+        assert_eq!(
+            dev,
+            JoinValue::Int(expected),
+            "unexpected result for input '{}'",
+            s
+        );
+    }
+}