refactor: 闭包捕获分析拆目录并自由函数化去除接收者

crates/oxide_emit/src/capture/captured.rs

@@ -0,0 +1,424 @@
+//! 闭包捕获分析，父层捕获分析：本函数哪些绑定被任意深度嵌套函数捕获
+//! → BTreeMap<String, u8>（cell_idx 按名字序，稳定跨 run）。
+
+use std::collections::{BTreeMap, HashSet};
+
+use oxide_parser::{Expression, Statement};
+
+use super::collect_fn_param_names;
+use super::names::collect_own_binding_names;
+use super::scanner::{collect_capture_names_expr, collect_capture_names_shadowed, collect_class_capture_names};
+
+/// 分析本函数：哪些绑定被任意深度嵌套函数捕获 → captured_bindings。
+pub(crate) fn collect_captured_bindings(
+    stmts: &[Statement], extra_exprs: &[&oxide_parser::Expression], own: &HashSet<String>,
+) -> BTreeMap<String, u8> {
+    let mut names = HashSet::new();
+    for stmt in stmts {
+        collect_captured_stmt(stmt, own, &mut names);
+    }
+    // 参数默认值表达式（不在 body_stmts 内）里的嵌套函数引用也要纳入捕获，
+    // 否则默认值内 IIFE 引用全局/外层变量走 LOAD_VAR 读寄存器残留（B022 扩展）。
+    for expr in extra_exprs {
+        collect_captured_expr(expr, own, &mut names);
+    }
+    // 名字排序分配 cell_idx（稳定跨 run，父 MAKE_CELL 与子 upvalue 统一引用）
+    let mut sorted: Vec<String> = names.into_iter().collect();
+    sorted.sort();
+    sorted.into_iter().enumerate().map(|(i, n)| (n, i as u8)).collect()
+}
+
+/// 收集函数参数默认值表达式里的嵌套函数引用（父层 captured/子层 upvalue 判定）。
+pub(crate) fn collect_fn_default_captured(
+    params: &oxide_parser::FormalParameters, own: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    let empty_shadow = HashSet::new();
+    for p in &params.items {
+        if let Some(init) = &p.initializer {
+            collect_capture_names_expr(init, own, &empty_shadow, out);
+        }
+        // 形参模式的运行时求值表达式（计算键/内嵌默认值）在子作用域求值，
+        // 其标识符引用须纳入父层 MAKE_CELL 判定。
+        collect_captured_pattern_runtime_exprs(&p.pattern, own, out);
+    }
+}
+
+/// 遍历绑定 pattern 内全部运行时求值表达式（计算键与 AssignmentPattern 默认值）：
+/// 这些表达式在子作用域（嵌套函数形参绑定时）求值，引用的父层绑定须建 cell 供
+/// 子函数 upvalue 读取——与 `collect_capture_names_expr` 同口径（标识符比对）。
+pub(crate) fn collect_captured_pattern_runtime_exprs(
+    pattern: &oxide_parser::BindingPattern, own: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    let empty_shadow = HashSet::new();
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(_) => {}
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_captured_pattern_runtime_exprs(p, own, out);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_captured_pattern_runtime_exprs(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                if prop.computed {
+                    collect_capture_names_expr(prop.key.to_expression(), own, &empty_shadow, out);
+                }
+                collect_captured_pattern_runtime_exprs(&prop.value, own, out);
+            }
+            if let Some(rest) = &op.rest {
+                collect_captured_pattern_runtime_exprs(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            collect_capture_names_expr(&ap.right, own, &empty_shadow, out);
+            collect_captured_pattern_runtime_exprs(&ap.left, own, out);
+        }
+    }
+}
+
+/// 只从嵌套函数节点进入扫描（本函数直接引用不算捕获）。
+pub(crate) fn collect_captured_stmt(stmt: &Statement, own: &HashSet<String>, out: &mut HashSet<String>) {
+    match stmt {
+        Statement::FunctionDeclaration(fd) => {
+            let body: &[Statement] = fd.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+            collect_fn_default_captured(&fd.params, own, out);
+            // 函数参数与体内部声明遮蔽父级绑定：体内对这些名字的引用不算捕获父级。
+            let mut fn_shadow = HashSet::new();
+            fn_shadow.extend(collect_fn_param_names(&fd.params));
+            fn_shadow.extend(collect_own_binding_names(&[], body));
+            collect_capture_names_shadowed(body, own, &fn_shadow, out);
+        }
+        Statement::ClassDeclaration(cd) => {
+            // 类构造器/方法体与字段表达式引用的父级绑定须建 cell，供子模块 upvalue 捕获。
+            let mut class_shadow = HashSet::new();
+            if let Some(id) = &cd.id {
+                class_shadow.insert(id.name.as_str().to_string());
+            }
+            collect_class_capture_names(&cd.body, own, &class_shadow, out);
+        }
+        Statement::ExpressionStatement(es) => collect_captured_expr(&es.expression, own, out),
+        Statement::ReturnStatement(rs) => {
+            if let Some(a) = &rs.argument {
+                collect_captured_expr(a, own, out);
+            }
+        }
+        Statement::VariableDeclaration(vd) => {
+            for d in &vd.declarations {
+                // 绑定 pattern 的计算键是运行时求值表达式，其引用须纳入捕获判定。
+                collect_captured_binding_keys(&d.id, own, out);
+                if let Some(init) = &d.init {
+                    collect_captured_expr(init, own, out);
+                }
+            }
+        }
+        Statement::IfStatement(is) => {
+            collect_captured_expr(&is.test, own, out);
+            collect_captured_stmt(&is.consequent, own, out);
+            if let Some(alt) = &is.alternate {
+                collect_captured_stmt(alt, own, out);
+            }
+        }
+        Statement::ForStatement(fs) => {
+            if let Some(init) = &fs.init {
+                if let Some(e) = init.as_expression() {
+                    collect_captured_expr(e, own, out);
+                }
+                if let oxide_parser::ForStatementInit::VariableDeclaration(vd) = init {
+                    for d in &vd.declarations {
+                        collect_captured_binding_keys(&d.id, own, out);
+                        if let Some(i) = &d.init {
+                            collect_captured_expr(i, own, out);
+                        }
+                    }
+                }
+            }
+            if let Some(t) = &fs.test {
+                collect_captured_expr(t, own, out);
+            }
+            if let Some(u) = &fs.update {
+                collect_captured_expr(u, own, out);
+            }
+            collect_captured_stmt(&fs.body, own, out);
+        }
+        Statement::WhileStatement(w) => {
+            collect_captured_expr(&w.test, own, out);
+            collect_captured_stmt(&w.body, own, out);
+        }
+        Statement::DoWhileStatement(d) => {
+            collect_captured_stmt(&d.body, own, out);
+            collect_captured_expr(&d.test, own, out);
+        }
+        Statement::ForInStatement(fi) => {
+            collect_captured_expr(&fi.right, own, out);
+            if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fi.left {
+                for d in &vd.declarations {
+                    collect_captured_binding_keys(&d.id, own, out);
+                }
+            }
+            collect_captured_stmt(&fi.body, own, out);
+        }
+        Statement::ForOfStatement(fo) => {
+            collect_captured_expr(&fo.right, own, out);
+            if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fo.left {
+                for d in &vd.declarations {
+                    collect_captured_binding_keys(&d.id, own, out);
+                }
+            }
+            collect_captured_stmt(&fo.body, own, out);
+        }
+        Statement::BlockStatement(b) => {
+            for s in &b.body {
+                collect_captured_stmt(s, own, out);
+            }
+        }
+        Statement::TryStatement(ts) => {
+            for s in &ts.block.body {
+                collect_captured_stmt(s, own, out);
+            }
+            if let Some(h) = &ts.handler {
+                if let Some(param) = &h.param {
+                    collect_captured_binding_pattern(&param.pattern, own, out);
+                }
+                for s in &h.body.body {
+                    collect_captured_stmt(s, own, out);
+                }
+            }
+            if let Some(f) = &ts.finalizer {
+                for s in &f.body {
+                    collect_captured_stmt(s, own, out);
+                }
+            }
+        }
+        Statement::ThrowStatement(ts) => collect_captured_expr(&ts.argument, own, out),
+        Statement::SwitchStatement(sw) => {
+            collect_captured_expr(&sw.discriminant, own, out);
+            for case in &sw.cases {
+                for s in &case.consequent {
+                    collect_captured_stmt(s, own, out);
+                }
+            }
+        }
+        Statement::LabeledStatement(ls) => collect_captured_stmt(&ls.body, own, out),
+        Statement::WithStatement(ws) => {
+            collect_captured_expr(&ws.object, own, out);
+            collect_captured_stmt(&ws.body, own, out);
+        }
+        _ => {}
+    }
+}
+
+/// 遍历 catch 参数解构模式内表达式引用（默认值等），供父层 MAKE_CELL 判定。
+pub(crate) fn collect_captured_binding_pattern(
+    pattern: &oxide_parser::BindingPattern, own: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(_) => {}
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_captured_binding_pattern(p, own, out);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_captured_binding_pattern(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                // 计算键表达式（本作用域 catch 参数求值，含 IIFE 等嵌套函数）引用
+                // 本函数绑定走寄存器，只须扫描键内嵌套函数表达式。
+                if prop.computed {
+                    collect_captured_expr(prop.key.to_expression(), own, out);
+                }
+                collect_captured_binding_pattern(&prop.value, own, out);
+            }
+            if let Some(rest) = &op.rest {
+                collect_captured_binding_pattern(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            collect_captured_expr(&ap.right, own, out);
+            collect_captured_binding_pattern(&ap.left, own, out);
+        }
+    }
+}
+
+/// 遍历绑定 pattern 的运行时求值表达式引用：计算键（`{[k]: a}` 的键）与内嵌
+/// 默认值（`{a = x}` 的 x），供父层捕获判定（声明语句/for 头的模式与 catch/
+/// 默认值路径同口径）。
+pub(crate) fn collect_captured_binding_keys(
+    pattern: &oxide_parser::BindingPattern, own: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(_) => {}
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_captured_binding_keys(p, own, out);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_captured_binding_keys(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                if prop.computed {
+                    collect_captured_expr(prop.key.to_expression(), own, out);
+                }
+                collect_captured_binding_keys(&prop.value, own, out);
+            }
+            if let Some(rest) = &op.rest {
+                collect_captured_binding_keys(&rest.argument, own, out);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            // 内嵌默认值表达式引用外层绑定须建 cell（与 captured_binding_pattern
+            // 同口径）；left 继续递归模式键。
+            collect_captured_expr(&ap.right, own, out);
+            collect_captured_binding_keys(&ap.left, own, out);
+        }
+    }
+}
+
+pub(crate) fn collect_captured_expr(expr: &Expression, own: &HashSet<String>, out: &mut HashSet<String>) {
+    match expr {
+        Expression::FunctionExpression(fe) => {
+            let body: &[Statement] = fe.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+            let mut inner = collect_fn_param_names(&fe.params);
+            inner.extend(collect_own_binding_names(&[], body));
+            collect_fn_default_captured(&fe.params, own, out);
+            collect_capture_names_shadowed(body, own, &inner, out);
+        }
+        Expression::ArrowFunctionExpression(ae) => {
+            let mut inner = collect_fn_param_names(&ae.params);
+            inner.extend(collect_own_binding_names(&[], &ae.body.statements));
+            collect_fn_default_captured(&ae.params, own, out);
+            collect_capture_names_shadowed(&ae.body.statements, own, &inner, out);
+        }
+        Expression::ClassExpression(class) => {
+            // 类表达式：构造器/方法体与字段表达式引用的父级绑定须建 cell。
+            let mut class_shadow = HashSet::new();
+            if let Some(id) = &class.id {
+                class_shadow.insert(id.name.as_str().to_string());
+            }
+            collect_class_capture_names(&class.body, own, &class_shadow, out);
+        }
+        Expression::CallExpression(ce) => {
+            collect_captured_expr(&ce.callee, own, out);
+            for a in &ce.arguments {
+                collect_captured_arg(a, own, out);
+            }
+        }
+        Expression::BinaryExpression(be) => {
+            collect_captured_expr(&be.left, own, out);
+            collect_captured_expr(&be.right, own, out);
+        }
+        Expression::UnaryExpression(ue) => collect_captured_expr(&ue.argument, own, out),
+        Expression::LogicalExpression(le) => {
+            collect_captured_expr(&le.left, own, out);
+            collect_captured_expr(&le.right, own, out);
+        }
+        Expression::ConditionalExpression(ce) => {
+            collect_captured_expr(&ce.test, own, out);
+            collect_captured_expr(&ce.consequent, own, out);
+            collect_captured_expr(&ce.alternate, own, out);
+        }
+        Expression::SequenceExpression(se) => {
+            for e in &se.expressions {
+                collect_captured_expr(e, own, out);
+            }
+        }
+        Expression::AssignmentExpression(ae) => {
+            // 只扫右侧：左侧赋值目标是本函数绑定，不引用嵌套函数；
+            // 若目标含嵌套函数表达式（如 `[f()] = ...`），由其自身递归处理。
+            collect_captured_expr(&ae.right, own, out);
+        }
+        Expression::UpdateExpression(_ue) => {} // 一元更新目标不引用嵌套函数，无需捕获
+        Expression::ArrayExpression(ae) => {
+            for e in &ae.elements {
+                if let Some(e) = e.as_expression() {
+                    collect_captured_expr(e, own, out);
+                }
+            }
+        }
+        Expression::ObjectExpression(o) => {
+            for prop in &o.properties {
+                match prop {
+                    oxide_parser::ObjectPropertyKind::ObjectProperty(p) => {
+                        if p.computed {
+                            collect_captured_expr(p.key.to_expression(), own, out);
+                        }
+                        collect_captured_expr(&p.value, own, out);
+                    }
+                    oxide_parser::ObjectPropertyKind::SpreadProperty(spread) => {
+                        collect_captured_expr(&spread.argument, own, out);
+                    }
+                }
+            }
+        }
+        Expression::NewExpression(ne) => {
+            collect_captured_expr(&ne.callee, own, out);
+            for a in &ne.arguments {
+                collect_captured_arg(a, own, out);
+            }
+        }
+        Expression::ComputedMemberExpression(m) => {
+            collect_captured_expr(&m.object, own, out);
+            collect_captured_expr(&m.expression, own, out);
+        }
+        Expression::StaticMemberExpression(m) => collect_captured_expr(&m.object, own, out),
+        Expression::PrivateFieldExpression(m) => collect_captured_expr(&m.object, own, out),
+        Expression::TemplateLiteral(tl) => {
+            for e in &tl.expressions {
+                collect_captured_expr(e, own, out);
+            }
+        }
+        Expression::TaggedTemplateExpression(tt) => {
+            collect_captured_expr(&tt.tag, own, out);
+            for e in &tt.quasi.expressions {
+                collect_captured_expr(e, own, out);
+            }
+        }
+        Expression::ParenthesizedExpression(p) => collect_captured_expr(&p.expression, own, out),
+        Expression::YieldExpression(ye) => {
+            if let Some(a) = &ye.argument {
+                collect_captured_expr(a, own, out);
+            }
+        }
+        Expression::AwaitExpression(ae) => collect_captured_expr(&ae.argument, own, out),
+        Expression::ChainExpression(c) => collect_captured_chain(&c.expression, own, out),
+        _ => {}
+    }
+}
+
+pub(crate) fn collect_captured_chain(
+    element: &oxide_parser::ChainElement, own: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    match element {
+        oxide_parser::ChainElement::StaticMemberExpression(m) => {
+            collect_captured_expr(&m.object, own, out);
+        }
+        oxide_parser::ChainElement::ComputedMemberExpression(m) => {
+            collect_captured_expr(&m.object, own, out);
+            collect_captured_expr(&m.expression, own, out);
+        }
+        oxide_parser::ChainElement::PrivateFieldExpression(m) => {
+            collect_captured_expr(&m.object, own, out);
+        }
+        oxide_parser::ChainElement::CallExpression(c) => {
+            collect_captured_expr(&c.callee, own, out);
+            for a in &c.arguments {
+                collect_captured_arg(a, own, out);
+            }
+        }
+        _ => {}
+    }
+}
+
+/// 遍历调用实参：静态实参与 spread 内部表达式都纳入捕获判定。
+pub(crate) fn collect_captured_arg(arg: &oxide_parser::Argument, own: &HashSet<String>, out: &mut HashSet<String>) {
+    if let Some(e) = arg.as_expression() {
+        collect_captured_expr(e, own, out);
+    } else if let oxide_parser::Argument::SpreadElement(sp) = arg {
+        collect_captured_expr(&sp.argument, own, out);
+    }
+}

crates/oxide_emit/src/capture/mod.rs

@@ -0,0 +1,71 @@
+//! 闭包捕获分析（AST 级，emit 前完成，时序无关）。
+//!
+//! 收集本函数绑定的名字（own_bindings）与被嵌套函数捕获的名字
+//! （captured_bindings → cell_idx，按名排序稳定跨 run），为 MAKE_CELL /
+//! CELL_GET / CELL_SET 与子函数 upvalue cell_idx 提供统一依据。
+//!
+//! 五区严格单向分层（本文件 ← names ← scanner ← captured ← upvalues）：
+//! 跨区调用单向、无共享局部状态、无接收者状态。
+
+mod captured;
+mod names;
+mod scanner;
+mod upvalues;
+
+use std::collections::HashSet;
+
+pub(crate) use captured::collect_captured_bindings;
+pub(crate) use names::collect_own_binding_names;
+pub(crate) use names::collect_top_level_function_names;
+pub(crate) use names::collect_top_level_function_names_ordered;
+pub(crate) use names::collect_var_binding_names;
+pub(crate) use upvalues::collect_upvalue_names;
+
+pub(crate) fn collect_fn_param_names(params: &oxide_parser::FormalParameters) -> HashSet<String> {
+    let mut names = HashSet::new();
+    for p in &params.items {
+        collect_binding_pattern_names(&p.pattern, &mut names);
+    }
+    // rest 形参也是本函数作用域绑定，遮蔽外层同名变量。
+    if let Some(rest) = &params.rest {
+        collect_binding_pattern_names(&rest.rest.argument, &mut names);
+    }
+    names
+}
+
+/// 递归收集 binding pattern 内全部绑定标识符名（解构 `[a, b]` / `{x: y}` 嵌套）。
+pub(crate) fn collect_binding_pattern_names(pattern: &oxide_parser::BindingPattern, out: &mut HashSet<String>) {
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(bi) => {
+            out.insert(bi.name.to_string());
+        }
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_binding_pattern_names(p, out);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_binding_pattern_names(&rest.argument, out);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                collect_binding_pattern_names(&prop.value, out);
+            }
+            if let Some(rest) = &op.rest {
+                collect_binding_pattern_names(&rest.argument, out);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            collect_binding_pattern_names(&ap.left, out);
+        }
+    }
+}
+
+/// 收集 for-in/for-of 头部声明（`var x` / 解构 pattern）绑定的名字。
+pub(crate) fn collect_for_left_decl_names(left: &oxide_parser::ForStatementLeft, out: &mut HashSet<String>) {
+    if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = left {
+        for d in &vd.declarations {
+            collect_binding_pattern_names(&d.id, out);
+        }
+    }
+}

crates/oxide_emit/src/capture/names.rs

@@ -0,0 +1,261 @@
+//! 闭包捕获分析，own/var/顶层声明名收集：本函数 own_bindings 名集
+//! （参数名 + 变量/函数/import/export 声明，含嵌套块）、var 提升入口
+//! 名集、顶层函数声明名集（无序集 + 声明序列表）。
+
+use std::collections::HashSet;
+
+use oxide_parser::{Statement, VariableDeclarationKind};
+
+use super::{collect_binding_pattern_names, collect_for_left_decl_names};
+
+/// 收集语句树中全部 `var` 声明名（var 提升到函数/程序作用域，递归进嵌套块）。
+/// 供函数/程序入口批量 MAKE_CELL(undefined) 使用（var 入口实例化语义）。
+pub(crate) fn collect_var_binding_names(stmts: &[Statement]) -> HashSet<String> {
+    let mut names = HashSet::new();
+    collect_var_names_stmt(stmts, &mut names);
+    names
+}
+
+pub(crate) fn collect_var_names_stmt(stmts: &[Statement], out: &mut HashSet<String>) {
+    for stmt in stmts {
+        match stmt {
+            Statement::VariableDeclaration(vd) => {
+                if matches!(vd.kind, VariableDeclarationKind::Var) {
+                    for d in &vd.declarations {
+                        collect_binding_pattern_names(&d.id, out);
+                    }
+                }
+            }
+            Statement::BlockStatement(b) => collect_var_names_stmt(&b.body, out),
+            Statement::IfStatement(is) => {
+                collect_var_names_stmt(std::slice::from_ref(&is.consequent), out);
+                if let Some(alt) = &is.alternate {
+                    collect_var_names_stmt(std::slice::from_ref(alt), out);
+                }
+            }
+            Statement::WhileStatement(w) => collect_var_names_stmt(std::slice::from_ref(&w.body), out),
+            Statement::DoWhileStatement(d) => collect_var_names_stmt(std::slice::from_ref(&d.body), out),
+            Statement::ForStatement(f) => {
+                if let Some(oxide_parser::ForStatementInit::VariableDeclaration(vd)) = &f.init {
+                    if matches!(vd.kind, VariableDeclarationKind::Var) {
+                        for d in &vd.declarations {
+                            collect_binding_pattern_names(&d.id, out);
+                        }
+                    }
+                }
+                collect_var_names_stmt(std::slice::from_ref(&f.body), out);
+            }
+            Statement::ForInStatement(fi) => {
+                if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fi.left {
+                    // 仅 var 头名提升到函数作用域，let/const 头名是迭代级绑定。
+                    if matches!(vd.kind, VariableDeclarationKind::Var) {
+                        collect_for_left_decl_names(&fi.left, out);
+                    }
+                }
+                collect_var_names_stmt(std::slice::from_ref(&fi.body), out);
+            }
+            Statement::ForOfStatement(fo) => {
+                if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fo.left {
+                    // 仅 var 头名提升到函数作用域，let/const 头名是迭代级绑定。
+                    if matches!(vd.kind, VariableDeclarationKind::Var) {
+                        collect_for_left_decl_names(&fo.left, out);
+                    }
+                }
+                collect_var_names_stmt(std::slice::from_ref(&fo.body), out);
+            }
+            Statement::SwitchStatement(sw) => {
+                for case in &sw.cases {
+                    collect_var_names_stmt(&case.consequent, out);
+                }
+            }
+            Statement::TryStatement(ts) => {
+                collect_var_names_stmt(&ts.block.body, out);
+                if let Some(h) = &ts.handler {
+                    collect_var_names_stmt(&h.body.body, out);
+                }
+                if let Some(f) = &ts.finalizer {
+                    collect_var_names_stmt(&f.body, out);
+                }
+            }
+            Statement::LabeledStatement(ls) => collect_var_names_stmt(std::slice::from_ref(&ls.body), out),
+            Statement::WithStatement(ws) => collect_var_names_stmt(std::slice::from_ref(&ws.body), out),
+            Statement::ExportNamedDeclaration(exp) => {
+                if let Some(oxide_parser::Declaration::VariableDeclaration(vd)) = &exp.declaration {
+                    if matches!(vd.kind, VariableDeclarationKind::Var) {
+                        for d in &vd.declarations {
+                            collect_binding_pattern_names(&d.id, out);
+                        }
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+}
+
+/// 收集语句列表**直接子级**函数声明的绑定名（顶层函数声明是全局 var 绑定，
+/// 裸读/裸写与 var 名同路由全局对象属性）。不递归进块：块内函数声明是块
+/// 作用域，不参与全局对象同步；`export default function` 是 lexical 绑定，不纳。
+pub(crate) fn collect_top_level_function_names(stmts: &[Statement]) -> HashSet<String> {
+    let mut names = HashSet::new();
+    for stmt in stmts {
+        if let Statement::FunctionDeclaration(fd) = stmt {
+            if let Some(id) = &fd.id {
+                names.insert(id.name.to_string());
+            }
+        }
+    }
+    names
+}
+
+/// 同 [`collect_top_level_function_names`] 的收集面，但按**声明序**返回 Vec
+/// （供 GDI 检查阶段逆序遍历逐名去重，规范"逆序首见 = 源序最后声明"）。
+pub(crate) fn collect_top_level_function_names_ordered(stmts: &[Statement]) -> Vec<String> {
+    let mut names = Vec::new();
+    for stmt in stmts {
+        if let Statement::FunctionDeclaration(fd) = stmt {
+            if let Some(id) = &fd.id {
+                names.push(id.name.to_string());
+            }
+        }
+    }
+    names
+}
+
+/// 收集当前函数作用域声明的绑定名（参数 + 变量/函数声明，含嵌套 block，不含嵌套函数体）。
+pub(crate) fn collect_own_binding_names(param_names: &[&str], stmts: &[Statement]) -> HashSet<String> {
+    let mut names = HashSet::new();
+    for p in param_names {
+        names.insert(p.to_string());
+    }
+    collect_decl_names_stmt(stmts, &mut names);
+    names
+}
+
+pub(crate) fn collect_decl_names_stmt(stmts: &[Statement], out: &mut HashSet<String>) {
+    for stmt in stmts {
+        match stmt {
+            Statement::VariableDeclaration(vd) => {
+                for d in &vd.declarations {
+                    collect_binding_pattern_names(&d.id, out);
+                }
+            }
+            Statement::FunctionDeclaration(fd) => {
+                if let Some(id) = &fd.id {
+                    out.insert(id.name.to_string());
+                }
+            }
+            // class 名是本作用域 const 绑定：须计入 own_bindings，否则嵌套函数
+            // 引用类名时捕获分析缺失 → 落符号表兜底（TDZ 误报或读父寄存器残留）。
+            Statement::ClassDeclaration(cd) => {
+                if let Some(id) = &cd.id {
+                    out.insert(id.name.to_string());
+                }
+            }
+            // import 绑定是模块作用域 const 绑定，须计入 own_bindings 供
+            // 嵌套函数 cell 捕获。
+            Statement::ImportDeclaration(imp) => {
+                if let Some(specifiers) = &imp.specifiers {
+                    for sp in specifiers {
+                        match sp {
+                            oxide_parser::ImportDeclarationSpecifier::ImportSpecifier(s) => {
+                                out.insert(s.local.name.to_string());
+                            }
+                            oxide_parser::ImportDeclarationSpecifier::ImportDefaultSpecifier(s) => {
+                                out.insert(s.local.name.to_string());
+                            }
+                            oxide_parser::ImportDeclarationSpecifier::ImportNamespaceSpecifier(s) => {
+                                out.insert(s.local.name.to_string());
+                            }
+                        }
+                    }
+                }
+            }
+            Statement::ExportNamedDeclaration(exp) => {
+                if let Some(decl) = &exp.declaration {
+                    match decl {
+                        oxide_parser::Declaration::VariableDeclaration(vd) => {
+                            for d in &vd.declarations {
+                                collect_binding_pattern_names(&d.id, out);
+                            }
+                        }
+                        oxide_parser::Declaration::FunctionDeclaration(fd) => {
+                            if let Some(id) = &fd.id {
+                                out.insert(id.name.to_string());
+                            }
+                        }
+                        oxide_parser::Declaration::ClassDeclaration(cd) => {
+                            if let Some(id) = &cd.id {
+                                out.insert(id.name.to_string());
+                            }
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            Statement::ExportDefaultDeclaration(exp) => match &exp.declaration {
+                oxide_parser::ExportDefaultDeclarationKind::FunctionDeclaration(fd) => {
+                    if let Some(id) = &fd.id {
+                        out.insert(id.name.to_string());
+                    }
+                }
+                oxide_parser::ExportDefaultDeclarationKind::ClassDeclaration(cd) => {
+                    if let Some(id) = &cd.id {
+                        out.insert(id.name.to_string());
+                    }
+                }
+                _ => {}
+            },
+            Statement::BlockStatement(b) => collect_decl_names_stmt(&b.body, out),
+            Statement::IfStatement(is) => {
+                collect_decl_names_stmt(std::slice::from_ref(&is.consequent), out);
+                if let Some(alt) = &is.alternate {
+                    collect_decl_names_stmt(std::slice::from_ref(alt), out);
+                }
+            }
+            Statement::WhileStatement(w) => collect_decl_names_stmt(std::slice::from_ref(&w.body), out),
+            Statement::DoWhileStatement(d) => collect_decl_names_stmt(std::slice::from_ref(&d.body), out),
+            Statement::ForStatement(f) => {
+                if let Some(oxide_parser::ForStatementInit::VariableDeclaration(vd)) = &f.init {
+                    for d in &vd.declarations {
+                        if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
+                            out.insert(bi.name.to_string());
+                        }
+                    }
+                }
+                collect_decl_names_stmt(std::slice::from_ref(&f.body), out);
+            }
+            // for-in / for-of 头部的 var 声明是本函数局部绑定（遮蔽外层同名），
+            // 须计入 own_bindings，否则闭包捕获分析会误判为捕获外层变量。
+            Statement::ForInStatement(fi) => {
+                if let oxide_parser::ForStatementLeft::VariableDeclaration(_) = &fi.left {
+                    collect_for_left_decl_names(&fi.left, out);
+                }
+                collect_decl_names_stmt(std::slice::from_ref(&fi.body), out);
+            }
+            Statement::ForOfStatement(fo) => {
+                if let oxide_parser::ForStatementLeft::VariableDeclaration(_) = &fo.left {
+                    collect_for_left_decl_names(&fo.left, out);
+                }
+                collect_decl_names_stmt(std::slice::from_ref(&fo.body), out);
+            }
+            Statement::SwitchStatement(sw) => {
+                for case in &sw.cases {
+                    collect_decl_names_stmt(&case.consequent, out);
+                }
+            }
+            Statement::TryStatement(ts) => {
+                collect_decl_names_stmt(&ts.block.body, out);
+                if let Some(h) = &ts.handler {
+                    collect_decl_names_stmt(&h.body.body, out);
+                }
+                if let Some(f) = &ts.finalizer {
+                    collect_decl_names_stmt(&f.body, out);
+                }
+            }
+            Statement::LabeledStatement(ls) => collect_decl_names_stmt(std::slice::from_ref(&ls.body), out),
+            Statement::WithStatement(ws) => collect_decl_names_stmt(std::slice::from_ref(&ws.body), out),
+            _ => {}
+        }
+    }
+}

crates/oxide_emit/src/capture/scanner.rs

@@ -0,0 +1,614 @@
+//! 闭包捕获分析，遮蔽感知引用收集：ref_set × shadow 双集驱动，遍历
+//! 语句/表达式/赋值目标/类体 AST，嵌套函数/类/for 头/catch 参数逐层
+//! 遮蔽，收集任意深度嵌套函数引用的名字。
+
+use std::collections::HashSet;
+
+use oxide_parser::{ClassBody, ClassElement, Expression, Statement};
+
+use super::names::collect_own_binding_names;
+use super::{collect_fn_param_names, collect_for_left_decl_names};
+
+pub(crate) fn collect_capture_names_shadowed(
+    stmts: &[Statement], ref_set: &HashSet<String>, shadow: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    for stmt in stmts {
+        collect_capture_names_stmt(stmt, ref_set, shadow, out);
+    }
+}
+
+pub(crate) fn collect_capture_names_stmt(
+    stmt: &Statement, ref_set: &HashSet<String>, shadow: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    match stmt {
+        Statement::ExpressionStatement(es) => collect_capture_names_expr(&es.expression, ref_set, shadow, out),
+        Statement::ReturnStatement(rs) => {
+            if let Some(a) = &rs.argument {
+                collect_capture_names_expr(a, ref_set, shadow, out);
+            }
+        }
+        Statement::VariableDeclaration(vd) => {
+            for d in &vd.declarations {
+                // 绑定 pattern 的计算键是运行时求值表达式，其引用须纳入捕获。
+                collect_capture_names_binding_keys(&d.id, ref_set, shadow, out);
+                if let Some(init) = &d.init {
+                    collect_capture_names_expr(init, ref_set, shadow, out);
+                }
+            }
+        }
+        Statement::FunctionDeclaration(fd) => {
+            let body: &[Statement] = fd.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+            let mut inner = shadow.clone();
+            inner.extend(collect_fn_param_names(&fd.params));
+            inner.extend(collect_own_binding_names(&[], body));
+            collect_fn_default_names(&fd.params, ref_set, shadow, out);
+            collect_capture_names_shadowed(body, ref_set, &inner, out);
+        }
+        Statement::ClassDeclaration(cd) => {
+            // 类体（构造器/方法体、字段键与值、静态块）是嵌套作用域：
+            // 类名遮蔽外层绑定，方法形参与方法体局部进一步遮蔽。
+            let mut class_shadow = shadow.clone();
+            if let Some(id) = &cd.id {
+                class_shadow.insert(id.name.as_str().to_string());
+            }
+            collect_class_capture_names(&cd.body, ref_set, &class_shadow, out);
+        }
+        Statement::IfStatement(is) => {
+            collect_capture_names_expr(&is.test, ref_set, shadow, out);
+            collect_capture_names_stmt(&is.consequent, ref_set, shadow, out);
+            if let Some(alt) = &is.alternate {
+                collect_capture_names_stmt(alt, ref_set, shadow, out);
+            }
+        }
+        Statement::ForStatement(fs) => {
+            if let Some(init) = &fs.init {
+                if let Some(e) = init.as_expression() {
+                    collect_capture_names_expr(e, ref_set, shadow, out);
+                }
+                if let oxide_parser::ForStatementInit::VariableDeclaration(vd) = init {
+                    for d in &vd.declarations {
+                        collect_capture_names_binding_keys(&d.id, ref_set, shadow, out);
+                        if let Some(i) = &d.init {
+                            collect_capture_names_expr(i, ref_set, shadow, out);
+                        }
+                    }
+                }
+            }
+            if let Some(t) = &fs.test {
+                collect_capture_names_expr(t, ref_set, shadow, out);
+            }
+            if let Some(u) = &fs.update {
+                collect_capture_names_expr(u, ref_set, shadow, out);
+            }
+            collect_capture_names_stmt(&fs.body, ref_set, shadow, out);
+        }
+        Statement::WhileStatement(w) => {
+            collect_capture_names_expr(&w.test, ref_set, shadow, out);
+            collect_capture_names_stmt(&w.body, ref_set, shadow, out);
+        }
+        Statement::DoWhileStatement(d) => {
+            collect_capture_names_stmt(&d.body, ref_set, shadow, out);
+            collect_capture_names_expr(&d.test, ref_set, shadow, out);
+        }
+        Statement::ForInStatement(fi) => {
+            collect_capture_names_expr(&fi.right, ref_set, shadow, out);
+            // left 的 var 声明遮蔽外层同名绑定，body 内引用不视为捕获外层。
+            let mut for_shadow = shadow.clone();
+            collect_for_left_decl_names(&fi.left, &mut for_shadow);
+            if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fi.left {
+                for d in &vd.declarations {
+                    collect_capture_names_binding_keys(&d.id, ref_set, shadow, out);
+                }
+            }
+            collect_capture_names_shadowed(std::slice::from_ref(&fi.body), ref_set, &for_shadow, out);
+        }
+        Statement::ForOfStatement(fo) => {
+            collect_capture_names_expr(&fo.right, ref_set, shadow, out);
+            let mut for_shadow = shadow.clone();
+            collect_for_left_decl_names(&fo.left, &mut for_shadow);
+            if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fo.left {
+                for d in &vd.declarations {
+                    collect_capture_names_binding_keys(&d.id, ref_set, shadow, out);
+                }
+            }
+            collect_capture_names_shadowed(std::slice::from_ref(&fo.body), ref_set, &for_shadow, out);
+        }
+        Statement::BlockStatement(b) => collect_capture_names_shadowed(&b.body, ref_set, shadow, out),
+        Statement::TryStatement(ts) => {
+            for s in &ts.block.body {
+                collect_capture_names_stmt(s, ref_set, shadow, out);
+            }
+            if let Some(h) = &ts.handler {
+                // catch 参数解构模式内的表达式引用（默认值等）也会被内部闭包捕获；
+                // 参数声明名遮蔽 catch 作用域。
+                let mut catch_shadow = shadow.clone();
+                if let Some(param) = &h.param {
+                    collect_capture_names_binding_pattern(&param.pattern, ref_set, shadow, out, &mut catch_shadow);
+                }
+                for s in &h.body.body {
+                    collect_capture_names_stmt(s, ref_set, &catch_shadow, out);
+                }
+            }
+            if let Some(f) = &ts.finalizer {
+                for s in &f.body {
+                    collect_capture_names_stmt(s, ref_set, shadow, out);
+                }
+            }
+        }
+        Statement::ExportNamedDeclaration(exp) => {
+            if let Some(decl) = &exp.declaration {
+                match decl {
+                    oxide_parser::Declaration::VariableDeclaration(vd) => {
+                        for d in &vd.declarations {
+                            collect_capture_names_binding_keys(&d.id, ref_set, shadow, out);
+                            if let Some(init) = &d.init {
+                                collect_capture_names_expr(init, ref_set, shadow, out);
+                            }
+                        }
+                    }
+                    oxide_parser::Declaration::FunctionDeclaration(fd) => {
+                        let body: &[Statement] = fd.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+                        let mut inner = shadow.clone();
+                        inner.extend(collect_fn_param_names(&fd.params));
+                        inner.extend(collect_own_binding_names(&[], body));
+                        collect_fn_default_names(&fd.params, ref_set, shadow, out);
+                        collect_capture_names_shadowed(body, ref_set, &inner, out);
+                    }
+                    oxide_parser::Declaration::ClassDeclaration(cd) => {
+                        let mut class_shadow = shadow.clone();
+                        if let Some(id) = &cd.id {
+                            class_shadow.insert(id.name.as_str().to_string());
+                        }
+                        collect_class_capture_names(&cd.body, ref_set, &class_shadow, out);
+                    }
+                    _ => {}
+                }
+            }
+        }
+        Statement::ExportDefaultDeclaration(exp) => match &exp.declaration {
+            oxide_parser::ExportDefaultDeclarationKind::FunctionDeclaration(fd) => {
+                let body: &[Statement] = fd.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+                let mut inner = shadow.clone();
+                inner.extend(collect_fn_param_names(&fd.params));
+                inner.extend(collect_own_binding_names(&[], body));
+                collect_fn_default_names(&fd.params, ref_set, shadow, out);
+                collect_capture_names_shadowed(body, ref_set, &inner, out);
+            }
+            oxide_parser::ExportDefaultDeclarationKind::ClassDeclaration(cd) => {
+                let mut class_shadow = shadow.clone();
+                if let Some(id) = &cd.id {
+                    class_shadow.insert(id.name.as_str().to_string());
+                }
+                collect_class_capture_names(&cd.body, ref_set, &class_shadow, out);
+            }
+            other => {
+                if let Some(e) = other.as_expression() {
+                    collect_capture_names_expr(e, ref_set, shadow, out);
+                }
+            }
+        },
+        Statement::ThrowStatement(ts) => collect_capture_names_expr(&ts.argument, ref_set, shadow, out),
+        Statement::SwitchStatement(sw) => {
+            collect_capture_names_expr(&sw.discriminant, ref_set, shadow, out);
+            for case in &sw.cases {
+                for s in &case.consequent {
+                    collect_capture_names_stmt(s, ref_set, shadow, out);
+                }
+            }
+        }
+        Statement::LabeledStatement(ls) => collect_capture_names_stmt(&ls.body, ref_set, shadow, out),
+        Statement::WithStatement(ws) => {
+            collect_capture_names_expr(&ws.object, ref_set, shadow, out);
+            collect_capture_names_stmt(&ws.body, ref_set, shadow, out);
+        }
+        _ => {}
+    }
+}
+
+/// 收集类体对 `ref_set` 的引用：方法/构造器体、字段键与值、静态块。
+/// 方法形参与方法体局部声明遮蔽外层绑定（捕获判定用）。
+pub(crate) fn collect_class_capture_names(
+    class_body: &ClassBody, ref_set: &HashSet<String>, class_shadow: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    for element in &class_body.body {
+        match element {
+            ClassElement::MethodDefinition(method) => {
+                let mut inner = class_shadow.clone();
+                inner.extend(collect_fn_param_names(&method.value.params));
+                let body: &[Statement] = method.value.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+                inner.extend(collect_own_binding_names(&[], body));
+                collect_fn_default_names(&method.value.params, ref_set, class_shadow, out);
+                collect_capture_names_shadowed(body, ref_set, &inner, out);
+            }
+            ClassElement::PropertyDefinition(prop) => {
+                if let Some(expr) = prop.key.as_expression() {
+                    collect_capture_names_expr(expr, ref_set, class_shadow, out);
+                }
+                if let Some(value) = &prop.value {
+                    collect_capture_names_expr(value, ref_set, class_shadow, out);
+                }
+            }
+            ClassElement::StaticBlock(block) => {
+                collect_capture_names_shadowed(&block.body, ref_set, class_shadow, out);
+            }
+            _ => {}
+        }
+    }
+}
+
+/// 遍历 catch 参数解构模式：收集模式内表达式引用（默认值等），声明名写入
+/// `catch_shadow` 遮蔽 catch 作用域。
+pub(crate) fn collect_capture_names_binding_pattern(
+    pattern: &oxide_parser::BindingPattern, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>, catch_shadow: &mut HashSet<String>,
+) {
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(bi) => {
+            catch_shadow.insert(bi.name.as_str().to_string());
+        }
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_capture_names_binding_pattern(p, ref_set, shadow, out, catch_shadow);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_capture_names_binding_pattern(&rest.argument, ref_set, shadow, out, catch_shadow);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                // 计算键是运行时求值表达式，其引用须纳入捕获。
+                if prop.computed {
+                    collect_capture_names_expr(prop.key.to_expression(), ref_set, shadow, out);
+                }
+                collect_capture_names_binding_pattern(&prop.value, ref_set, shadow, out, catch_shadow);
+            }
+            if let Some(rest) = &op.rest {
+                collect_capture_names_binding_pattern(&rest.argument, ref_set, shadow, out, catch_shadow);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            collect_capture_names_expr(&ap.right, ref_set, shadow, out);
+            collect_capture_names_binding_pattern(&ap.left, ref_set, shadow, out, catch_shadow);
+        }
+    }
+}
+
+/// 遍历绑定 pattern 的运行时求值表达式引用：计算键（`{[k]: a}` 的键）与内嵌
+/// 默认值（`{a = x}` 的 x）都是模式内求值的表达式，嵌套函数引用外层绑定时须
+/// 纳入捕获（与赋值侧/对象字面量/类字段键遍历同口径）。
+pub(crate) fn collect_capture_names_binding_keys(
+    pattern: &oxide_parser::BindingPattern, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    match pattern {
+        oxide_parser::BindingPattern::BindingIdentifier(_) => {}
+        oxide_parser::BindingPattern::ArrayPattern(ap) => {
+            for p in ap.elements.iter().flatten() {
+                collect_capture_names_binding_keys(p, ref_set, shadow, out);
+            }
+            if let Some(rest) = &ap.rest {
+                collect_capture_names_binding_keys(&rest.argument, ref_set, shadow, out);
+            }
+        }
+        oxide_parser::BindingPattern::ObjectPattern(op) => {
+            for prop in &op.properties {
+                if prop.computed {
+                    collect_capture_names_expr(prop.key.to_expression(), ref_set, shadow, out);
+                }
+                collect_capture_names_binding_keys(&prop.value, ref_set, shadow, out);
+            }
+            if let Some(rest) = &op.rest {
+                collect_capture_names_binding_keys(&rest.argument, ref_set, shadow, out);
+            }
+        }
+        oxide_parser::BindingPattern::AssignmentPattern(ap) => {
+            // 内嵌默认值表达式引用外层绑定须捕获（与 binding_pattern/赋值侧
+            // maybe_default 的 init 扫描同口径）；left 继续递归模式键。
+            collect_capture_names_expr(&ap.right, ref_set, shadow, out);
+            collect_capture_names_binding_keys(&ap.left, ref_set, shadow, out);
+        }
+    }
+}
+
+/// 扫描赋值目标中的引用（标识符写名，成员目标扫对象/键，解构目标递归元素）。
+pub(crate) fn collect_capture_names_assign_target(
+    target: &oxide_parser::AssignmentTarget, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    match target {
+        oxide_parser::AssignmentTarget::AssignmentTargetIdentifier(ati) => {
+            let name = ati.name.as_str();
+            if ref_set.contains(name) && !shadow.contains(name) {
+                out.insert(ati.name.to_string());
+            }
+        }
+        oxide_parser::AssignmentTarget::StaticMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+        }
+        oxide_parser::AssignmentTarget::ComputedMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+            collect_capture_names_expr(&m.expression, ref_set, shadow, out);
+        }
+        oxide_parser::AssignmentTarget::ArrayAssignmentTarget(a) => {
+            for e in a.elements.iter().flatten() {
+                collect_capture_names_maybe_default_target(e, ref_set, shadow, out);
+            }
+            if let Some(rest) = &a.rest {
+                collect_capture_names_assign_target(&rest.target, ref_set, shadow, out);
+            }
+        }
+        oxide_parser::AssignmentTarget::ObjectAssignmentTarget(o) => {
+            for prop in &o.properties {
+                if let oxide_parser::AssignmentTargetProperty::AssignmentTargetPropertyIdentifier(id) = prop {
+                    if ref_set.contains(id.binding.name.as_str()) && !shadow.contains(id.binding.name.as_str()) {
+                        out.insert(id.binding.name.to_string());
+                    }
+                    if let Some(init) = &id.init {
+                        collect_capture_names_expr(init, ref_set, shadow, out);
+                    }
+                } else if let oxide_parser::AssignmentTargetProperty::AssignmentTargetPropertyProperty(p) = prop {
+                    if let Some(name_expr) = p.name.as_expression() {
+                        collect_capture_names_expr(name_expr, ref_set, shadow, out);
+                    }
+                    collect_capture_names_maybe_default_target(&p.binding, ref_set, shadow, out);
+                }
+            }
+            if let Some(rest) = &o.rest {
+                collect_capture_names_assign_target(&rest.target, ref_set, shadow, out);
+            }
+        }
+        _ => {}
+    }
+}
+
+/// 解构赋值元素可能是 `AssignmentTarget` 或带默认值的包装（后者多一层 `init`）。
+pub(crate) fn collect_capture_names_maybe_default_target(
+    target: &oxide_parser::AssignmentTargetMaybeDefault, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    use oxide_parser::AssignmentTargetMaybeDefault as MaybeDefault;
+    match target {
+        MaybeDefault::AssignmentTargetWithDefault(d) => {
+            collect_capture_names_expr(&d.init, ref_set, shadow, out);
+            collect_capture_names_assign_target(&d.binding, ref_set, shadow, out);
+        }
+        MaybeDefault::AssignmentTargetIdentifier(ati) => {
+            let name = ati.name.as_str();
+            if ref_set.contains(name) && !shadow.contains(name) {
+                out.insert(ati.name.to_string());
+            }
+        }
+        MaybeDefault::StaticMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+        }
+        MaybeDefault::ComputedMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+            collect_capture_names_expr(&m.expression, ref_set, shadow, out);
+        }
+        MaybeDefault::ArrayAssignmentTarget(a) => {
+            for e in a.elements.iter().flatten() {
+                collect_capture_names_maybe_default_target(e, ref_set, shadow, out);
+            }
+        }
+        MaybeDefault::ObjectAssignmentTarget(o) => {
+            for prop in &o.properties {
+                if let oxide_parser::AssignmentTargetProperty::AssignmentTargetPropertyIdentifier(id) = prop {
+                    if ref_set.contains(id.binding.name.as_str()) && !shadow.contains(id.binding.name.as_str()) {
+                        out.insert(id.binding.name.to_string());
+                    }
+                    if let Some(init) = &id.init {
+                        collect_capture_names_expr(init, ref_set, shadow, out);
+                    }
+                } else if let oxide_parser::AssignmentTargetProperty::AssignmentTargetPropertyProperty(p) = prop {
+                    if let Some(name_expr) = p.name.as_expression() {
+                        collect_capture_names_expr(name_expr, ref_set, shadow, out);
+                    }
+                    collect_capture_names_maybe_default_target(&p.binding, ref_set, shadow, out);
+                }
+            }
+        }
+        _ => {}
+    }
+}
+
+/// 扫描一元更新目标（`++x` / `obj.x++`）中的引用。
+pub(crate) fn collect_capture_names_simple_target(
+    target: &oxide_parser::SimpleAssignmentTarget, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    match target {
+        oxide_parser::SimpleAssignmentTarget::AssignmentTargetIdentifier(ati) => {
+            let name = ati.name.as_str();
+            if ref_set.contains(name) && !shadow.contains(name) {
+                out.insert(ati.name.to_string());
+            }
+        }
+        oxide_parser::SimpleAssignmentTarget::StaticMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+        }
+        oxide_parser::SimpleAssignmentTarget::ComputedMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+            collect_capture_names_expr(&m.expression, ref_set, shadow, out);
+        }
+        _ => {}
+    }
+}
+
+/// 收集函数参数默认值表达式里的引用（子层 upvalue 判定；参数名遮蔽）。
+pub(crate) fn collect_fn_default_names(
+    params: &oxide_parser::FormalParameters, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    for p in &params.items {
+        if let Some(init) = &p.initializer {
+            collect_capture_names_expr(init, ref_set, shadow, out);
+        }
+        let mut param_shadow = shadow.clone();
+        collect_capture_names_binding_pattern(&p.pattern, ref_set, shadow, out, &mut param_shadow);
+    }
+}
+
+pub(crate) fn collect_capture_names_expr(
+    expr: &Expression, ref_set: &HashSet<String>, shadow: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    match expr {
+        Expression::Identifier(id) => {
+            let name = id.name.as_str();
+            if ref_set.contains(name) && !shadow.contains(name) {
+                out.insert(id.name.to_string());
+            }
+        }
+        Expression::AssignmentExpression(ae) => {
+            // 赋值目标里的引用也须捕获：标识符目标写名，成员/解构目标扫描其对象/元素。
+            collect_capture_names_assign_target(&ae.left, ref_set, shadow, out);
+            collect_capture_names_expr(&ae.right, ref_set, shadow, out);
+        }
+        Expression::UpdateExpression(ue) => {
+            collect_capture_names_simple_target(&ue.argument, ref_set, shadow, out);
+        }
+        Expression::FunctionExpression(fe) => {
+            let body: &[Statement] = fe.body.as_ref().map(|b| &b.statements[..]).unwrap_or(&[]);
+            let mut inner = shadow.clone();
+            inner.extend(collect_fn_param_names(&fe.params));
+            inner.extend(collect_own_binding_names(&[], body));
+            collect_fn_default_names(&fe.params, ref_set, shadow, out);
+            collect_capture_names_shadowed(body, ref_set, &inner, out);
+        }
+        Expression::ArrowFunctionExpression(ae) => {
+            let mut inner = shadow.clone();
+            inner.extend(collect_fn_param_names(&ae.params));
+            inner.extend(collect_own_binding_names(&[], &ae.body.statements));
+            collect_fn_default_names(&ae.params, ref_set, shadow, out);
+            collect_capture_names_shadowed(&ae.body.statements, ref_set, &inner, out);
+        }
+        Expression::ClassExpression(class) => {
+            // 类表达式：方法/构造器体与字段表达式是嵌套作用域，引用须捕获。
+            let mut class_shadow = shadow.clone();
+            if let Some(id) = &class.id {
+                class_shadow.insert(id.name.as_str().to_string());
+            }
+            collect_class_capture_names(&class.body, ref_set, &class_shadow, out);
+        }
+        Expression::BinaryExpression(be) => {
+            collect_capture_names_expr(&be.left, ref_set, shadow, out);
+            collect_capture_names_expr(&be.right, ref_set, shadow, out);
+        }
+        Expression::UnaryExpression(ue) => collect_capture_names_expr(&ue.argument, ref_set, shadow, out),
+        Expression::CallExpression(ce) => {
+            collect_capture_names_expr(&ce.callee, ref_set, shadow, out);
+            for a in &ce.arguments {
+                collect_capture_names_arg(a, ref_set, shadow, out);
+            }
+        }
+        Expression::NewExpression(ne) => {
+            collect_capture_names_expr(&ne.callee, ref_set, shadow, out);
+            for a in &ne.arguments {
+                collect_capture_names_arg(a, ref_set, shadow, out);
+            }
+        }
+        Expression::SequenceExpression(se) => {
+            for e in &se.expressions {
+                collect_capture_names_expr(e, ref_set, shadow, out);
+            }
+        }
+        Expression::ConditionalExpression(ce) => {
+            collect_capture_names_expr(&ce.test, ref_set, shadow, out);
+            collect_capture_names_expr(&ce.consequent, ref_set, shadow, out);
+            collect_capture_names_expr(&ce.alternate, ref_set, shadow, out);
+        }
+        Expression::ArrayExpression(ae) => {
+            for e in &ae.elements {
+                if let Some(e) = e.as_expression() {
+                    collect_capture_names_expr(e, ref_set, shadow, out);
+                }
+            }
+        }
+        Expression::LogicalExpression(le) => {
+            collect_capture_names_expr(&le.left, ref_set, shadow, out);
+            collect_capture_names_expr(&le.right, ref_set, shadow, out);
+        }
+        Expression::ComputedMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+            collect_capture_names_expr(&m.expression, ref_set, shadow, out);
+        }
+        Expression::StaticMemberExpression(m) => collect_capture_names_expr(&m.object, ref_set, shadow, out),
+        Expression::PrivateFieldExpression(m) => collect_capture_names_expr(&m.object, ref_set, shadow, out),
+        Expression::ParenthesizedExpression(p) => collect_capture_names_expr(&p.expression, ref_set, shadow, out),
+        Expression::TemplateLiteral(tl) => {
+            for e in &tl.expressions {
+                collect_capture_names_expr(e, ref_set, shadow, out);
+            }
+        }
+        Expression::TaggedTemplateExpression(tt) => {
+            collect_capture_names_expr(&tt.tag, ref_set, shadow, out);
+            for e in &tt.quasi.expressions {
+                collect_capture_names_expr(e, ref_set, shadow, out);
+            }
+        }
+        Expression::ObjectExpression(o) => {
+            for prop in &o.properties {
+                match prop {
+                    oxide_parser::ObjectPropertyKind::ObjectProperty(p) => {
+                        if p.computed {
+                            collect_capture_names_expr(p.key.to_expression(), ref_set, shadow, out);
+                        }
+                        collect_capture_names_expr(&p.value, ref_set, shadow, out);
+                    }
+                    oxide_parser::ObjectPropertyKind::SpreadProperty(spread) => {
+                        collect_capture_names_expr(&spread.argument, ref_set, shadow, out);
+                    }
+                }
+            }
+        }
+        // 生成器让出表达式：被让出的值里引用的父变量须纳入捕获，否则生成器体经
+        // LOAD_VAR 读调用方寄存器残留（挂起恢复后寄存器已被覆盖）。
+        Expression::YieldExpression(ye) => {
+            if let Some(a) = &ye.argument {
+                collect_capture_names_expr(a, ref_set, shadow, out);
+            }
+        }
+        // await 表达式：被等待的值里引用的父变量须纳入捕获（与 yield 同因——
+        // 异步体挂起恢复后寄存器已被覆盖，只能经 cell 读取）。
+        Expression::AwaitExpression(ae) => {
+            collect_capture_names_expr(&ae.argument, ref_set, shadow, out);
+        }
+        Expression::ChainExpression(c) => collect_capture_names_chain(&c.expression, ref_set, shadow, out),
+        _ => {}
+    }
+}
+
+pub(crate) fn collect_capture_names_chain(
+    element: &oxide_parser::ChainElement, ref_set: &HashSet<String>, shadow: &HashSet<String>,
+    out: &mut HashSet<String>,
+) {
+    match element {
+        oxide_parser::ChainElement::StaticMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+        }
+        oxide_parser::ChainElement::ComputedMemberExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+            collect_capture_names_expr(&m.expression, ref_set, shadow, out);
+        }
+        oxide_parser::ChainElement::PrivateFieldExpression(m) => {
+            collect_capture_names_expr(&m.object, ref_set, shadow, out);
+        }
+        oxide_parser::ChainElement::CallExpression(call) => {
+            collect_capture_names_expr(&call.callee, ref_set, shadow, out);
+            for a in &call.arguments {
+                collect_capture_names_arg(a, ref_set, shadow, out);
+            }
+        }
+        _ => {}
+    }
+}
+
+/// 遍历调用实参：静态实参与 spread 内部表达式都纳入捕获扫描。
+pub(crate) fn collect_capture_names_arg(
+    arg: &oxide_parser::Argument, ref_set: &HashSet<String>, shadow: &HashSet<String>, out: &mut HashSet<String>,
+) {
+    if let Some(e) = arg.as_expression() {
+        collect_capture_names_expr(e, ref_set, shadow, out);
+    } else if let oxide_parser::Argument::SpreadElement(sp) = arg {
+        collect_capture_names_expr(&sp.argument, ref_set, shadow, out);
+    }
+}

crates/oxide_emit/src/capture/upvalues.rs

@@ -0,0 +1,48 @@
+//! 闭包捕获分析，子函数 upvalue 分析：子函数体对父被捕获绑定的引用
+//! → Vec<UpvalueCapture>（排序对齐 cell_idx，enclosing_reg 留 0 待
+//! assemble_ir 填充）。
+
+use std::collections::{BTreeMap, HashSet};
+
+use oxide_bytecode::module::UpvalueCapture;
+use oxide_parser::Statement;
+
+use super::scanner::{collect_capture_names_expr, collect_capture_names_shadowed};
+
+/// 分析子函数 body：引用父级被捕获绑定的名字 → upvalue_captures。
+/// 名字若在父 `captured_bindings`（父 own cell）则 `cell_idx` 索引定义方表；
+/// 若在父 `upvalue_captures`（父自身从更外层捕获）则链式标记 `parent_uv_idx`，
+/// 运行时从父闭包 upvalues 取 cell。enclosing_reg 由父 emit 完成后填充。
+pub(crate) fn collect_upvalue_names(
+    body_stmts: &[Statement], extra_exprs: &[&oxide_parser::Expression], parent_captured: &BTreeMap<String, u8>,
+    parent_upvalues: &[UpvalueCapture], sub_own: &HashSet<String>,
+) -> Vec<UpvalueCapture> {
+    let mut parent_names: HashSet<String> = parent_captured.keys().cloned().collect();
+    for u in parent_upvalues {
+        parent_names.insert(u.name.clone());
+    }
+    let mut names = HashSet::new();
+    collect_capture_names_shadowed(body_stmts, &parent_names, sub_own, &mut names);
+    // 参数默认值表达式（不在 body_stmts）里的嵌套函数引用也会捕获父变量。
+    for expr in extra_exprs {
+        collect_capture_names_expr(expr, &parent_names, sub_own, &mut names);
+    }
+    // HashSet 迭代序带随机种子（进程级非确定），必须排序使 upvalue_captures 的顺序与
+    // 父 captured_bindings 的 cell_idx（BTreeMap 名字序）对齐——否则 LOAD_UPVALUE 的
+    // a 槽 uv_idx 编码与 cell_idx 错位，读错 upvalue。
+    let mut names: Vec<String> = names.into_iter().collect();
+    names.sort();
+    names
+        .into_iter()
+        .map(|name| {
+            let parent_uv_idx = parent_upvalues.iter().position(|u| u.name == name).map(|i| i as u8);
+            let cell_idx = parent_captured.get(&name).copied().unwrap_or(0);
+            UpvalueCapture {
+                name,
+                enclosing_reg: 0, // assemble_ir 时从父符号表填充
+                cell_idx,
+                parent_uv_idx,
+            }
+        })
+        .collect()
+}

crates/oxide_emit/src/function_body.rs

@@ -2,7 +2,7 @@
 //! （参数 prologue、参数默认值与闭包捕获分析、双 sub-pass 语句发射）。
 //!
 //! 两类型经 lib.rs 重导出供各语法域构造实参；编译链为 `Emitter` 方法，
-//! 捕获分析经 `self.*` 调用 closure 族，与所在文件无关。
+//! 捕获分析经自由函数调用 capture 族，与所在文件无关。
 
 use std::collections::HashSet;
 
@@ -13,6 +13,10 @@ use oxide_ir::operand::{LabelId, Operand};
 use oxide_ir::IRFunction;
 use oxide_parser::{Expression, Statement, VariableDeclarationKind};
 
+use crate::capture::{
+    collect_binding_pattern_names, collect_captured_bindings, collect_own_binding_names, collect_upvalue_names,
+    collect_var_binding_names,
+};
 use crate::compile_ctx::{CompileCtx, FieldBuffer};
 use crate::symbol_table::{Binding, ScopeKind};
 use crate::Emitter;
@@ -299,7 +303,7 @@ impl Emitter {
         for spec in param_specs {
             param_names.insert(spec.register_name().to_string());
             if let ParamSpec::Pattern { pattern, .. } = spec {
-                self.collect_binding_pattern_names(pattern, &mut param_names);
+                collect_binding_pattern_names(pattern, &mut param_names);
             }
         }
         ctx.param_names = param_names;
@@ -527,10 +531,10 @@ impl Emitter {
                 ParamSpec::Rest { .. } => {}
             }
         }
-        ctx.own_bindings = self.collect_own_binding_names(&param_names, body_stmts);
+        ctx.own_bindings = collect_own_binding_names(&param_names, body_stmts);
         for spec in param_specs {
             if let ParamSpec::Pattern { pattern, .. } = spec {
-                self.collect_binding_pattern_names(pattern, &mut ctx.own_bindings);
+                collect_binding_pattern_names(pattern, &mut ctx.own_bindings);
             }
         }
 
@@ -548,13 +552,13 @@ impl Emitter {
         // 字段初始化表达式（值表达式）与参数默认值一并纳入捕获分析。
         let mut capture_exprs: Vec<&oxide_parser::Expression> = param_defaults.clone();
         capture_exprs.extend_from_slice(extra_capture_exprs);
-        ctx.captured_bindings = self.collect_captured_bindings(body_stmts, &capture_exprs, &ctx.own_bindings);
+        ctx.captured_bindings = collect_captured_bindings(body_stmts, &capture_exprs, &ctx.own_bindings);
         // 自由变量分析：收集 upvalue 捕获（类方法也是普通函数，可捕获外层变量）。
         if matches!(
             body_context,
             FunctionBodyContext::Ordinary | FunctionBodyContext::Arrow | FunctionBodyContext::ClassElement
         ) {
-            ctx.current_upvalue_captures = self.collect_upvalue_names(
+            ctx.current_upvalue_captures = collect_upvalue_names(
                 body_stmts,
                 &capture_exprs,
                 &parent_ctx.captured_bindings,
@@ -659,8 +663,7 @@ impl Emitter {
         // 只是赋值；否则声明语句前创建的闭包读取占位 cell → TDZ 误报。参数与
         // arguments 已在上方初始化（跳过以免覆盖参数值）；let/const/class 保持
         // TDZ 语义不动。声明语句的 MAKE_CELL 按占位更新语义覆盖此初值。
-        let var_names: Vec<String> = self
+        let var_names: Vec<String> = collect_var_binding_names(body_stmts)
-            .collect_var_binding_names(body_stmts)
             .into_iter()
             .filter(|n| !param_names.contains(&n.as_str()) && n != "arguments")
             .filter(|n| ctx.captured_bindings.contains_key(n))

crates/oxide_emit/src/lib.rs

@@ -5,8 +5,8 @@
 //! `oxide_ir::lower` 降为 bytecode。语法按域拆分：`expr/`、`stmt/`、`class/`、
 //! `shared/`；作用域与闭包捕获分析在 emit 前完成，消除符号表时序依赖。
 
+mod capture;
 pub mod class;
-pub mod closure;
 mod compile_ctx;
 pub mod emit;
 pub mod emit_ctx;

crates/oxide_emit/src/module.rs

@@ -7,6 +7,7 @@
 use std::collections::HashSet;
 use std::path::Path;
 
+use crate::capture::{collect_captured_bindings, collect_own_binding_names};
 use crate::expr::call::pack_arg_regs;
 use crate::{CompileCtx, Emitter};
 use oxc_allocator::Box;
@@ -171,8 +172,8 @@ impl Emitter {
         let _ = self.predeclare_lexical_declarations(body, ctx, false);
 
         // 闭包捕获分析（import 绑定名纳入 own_bindings，供嵌套函数 cell 捕获）。
-        ctx.own_bindings = self.collect_own_binding_names(&[], body);
+        ctx.own_bindings = collect_own_binding_names(&[], body);
-        ctx.captured_bindings = self.collect_captured_bindings(body, &[], &ctx.own_bindings);
+        ctx.captured_bindings = collect_captured_bindings(body, &[], &ctx.own_bindings);
 
         // —— 模块命名空间对象 ——
         let ns_reg = self.emit_module_call(ctx, "__moduleObject", &[])?;

crates/oxide_emit/src/prepass/block_fn.rs

@@ -4,6 +4,7 @@
 
 use std::collections::HashSet;
 
+use crate::capture::collect_binding_pattern_names;
 use crate::Emitter;
 use oxide_parser::{Declaration, Statement, VariableDeclarationKind};
 
@@ -98,7 +99,7 @@ impl Emitter {
                 Statement::VariableDeclaration(vd) => {
                     if !matches!(vd.kind, VariableDeclarationKind::Var) {
                         for d in &vd.declarations {
-                            self.collect_binding_pattern_names(&d.id, names);
+                            collect_binding_pattern_names(&d.id, names);
                         }
                     }
                 }
@@ -111,7 +112,7 @@ impl Emitter {
                     if let Some(oxide_parser::ForStatementInit::VariableDeclaration(decl)) = &fs.init {
                         if !matches!(decl.kind, VariableDeclarationKind::Var) {
                             for d in &decl.declarations {
-                                self.collect_binding_pattern_names(&d.id, names);
+                                collect_binding_pattern_names(&d.id, names);
                             }
                         }
                     }
@@ -121,7 +122,7 @@ impl Emitter {
                     if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fi.left {
                         if !matches!(decl.kind, VariableDeclarationKind::Var) {
                             for d in &decl.declarations {
-                                self.collect_binding_pattern_names(&d.id, names);
+                                collect_binding_pattern_names(&d.id, names);
                             }
                         }
                     }
@@ -131,7 +132,7 @@ impl Emitter {
                     if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fo.left {
                         if !matches!(decl.kind, VariableDeclarationKind::Var) {
                             for d in &decl.declarations {
-                                self.collect_binding_pattern_names(&d.id, names);
+                                collect_binding_pattern_names(&d.id, names);
                             }
                         }
                     }
@@ -141,7 +142,7 @@ impl Emitter {
                     // catch 参数是 handler 环境的词法绑定。
                     if let Some(handler) = &ts.handler {
                         if let Some(param) = &handler.param {
-                            self.collect_binding_pattern_names(&param.pattern, names);
+                            collect_binding_pattern_names(&param.pattern, names);
                         }
                         self.collect_lexical_name_suppressions(&handler.body.body, names);
                     }
@@ -178,7 +179,7 @@ impl Emitter {
                     if let Some(Declaration::VariableDeclaration(vd)) = &exp.declaration {
                         if !matches!(vd.kind, VariableDeclarationKind::Var) {
                             for d in &vd.declarations {
-                                self.collect_binding_pattern_names(&d.id, names);
+                                collect_binding_pattern_names(&d.id, names);
                             }
                         }
                     }

crates/oxide_emit/src/program.rs

@@ -16,6 +16,10 @@ use oxide_ir::operand::Operand;
 use oxide_ir::IRFunction;
 use oxide_parser::Statement;
 
+use crate::capture::{
+    collect_captured_bindings, collect_own_binding_names, collect_top_level_function_names,
+    collect_top_level_function_names_ordered, collect_var_binding_names,
+};
 use crate::compile_ctx::CompileCtx;
 use crate::Emitter;
 
@@ -220,7 +224,7 @@ impl Emitter {
     /// - 仅遍历语句列表直接子级具名函数声明（生成器/异步声明同节点类型，天然
     ///   覆盖）；块内函数声明与 `export default function` 不入全局检查面。
     pub(crate) fn emit_gdi_func_decl_checks(&self, stmts: &[Statement], ctx: &mut CompileCtx) {
-        let names = self.collect_top_level_function_names_ordered(stmts);
+        let names = collect_top_level_function_names_ordered(stmts);
         let mut seen = HashSet::new();
         for name in names.iter().rev() {
             // 逆序首见即源序最后声明者（规范去重口径），重名只查一次。
@@ -262,7 +266,7 @@ impl Emitter {
         // 严格 eval 代码函数声明绑定 eval 自身 lexical 环境、不触全局、不抛，门禁
         // 随 !is_strict 关闭，其写点抑制在声明发射处。
         if ctx.is_eval_script && !ctx.is_strict {
-            for name in self.collect_top_level_function_names(&program.body) {
+            for name in collect_top_level_function_names(&program.body) {
                 if NON_WRITABLE_GLOBAL_BUILTINS.contains(&name.as_str()) {
                     let _ = self.emit_throw_error(
                         "TypeError",
@@ -312,15 +316,15 @@ impl Emitter {
         }
 
         // 闭包捕获分析（AST 级，emit 前确定）
-        ctx.own_bindings = self.collect_own_binding_names(&[], &program.body);
+        ctx.own_bindings = collect_own_binding_names(&[], &program.body);
         // 顶层已声明名（A 侧单一真值）：裸读走全局对象属性、裸写走描述符感知
         // A 侧写，不落镜像 cell——从捕获集剔除，使嵌套函数经继承 scope-0 直连全局。
         // 集 = 顶层 var 名 ∪ 顶层函数声明名：函数值是编译闭包，编译期不可得，
         // 其 A 侧值由首 sub-pass 以真闭包建立，先于任何用户代码。
         // 仅在此顶层调用点过滤：嵌套函数的局部同名遮蔽是独立绑定，其调用点不过滤。
-        let var_names = self.collect_var_binding_names(&program.body);
+        let var_names = collect_var_binding_names(&program.body);
         let mut tier_names = var_names.clone();
-        tier_names.extend(self.collect_top_level_function_names(&program.body));
+        tier_names.extend(collect_top_level_function_names(&program.body));
         // 块级函数泄漏名并入：求值期写回与头写同走全局对象属性（A 侧单一真值）。
         for name in &block_fn_names {
             if !ctx.block_fn_suppressed.contains(name) && !CompileCtx::is_non_writable_global_builtin(name) {
@@ -328,7 +332,7 @@ impl Emitter {
             }
         }
         ctx.global_tier_names = tier_names;
-        ctx.captured_bindings = self.collect_captured_bindings(&program.body, &[], &ctx.own_bindings);
+        ctx.captured_bindings = collect_captured_bindings(&program.body, &[], &ctx.own_bindings);
         ctx.captured_bindings.retain(|n, _| !ctx.global_tier_names.contains(n));
 
         // 顶层 var 入口实例化：被捕获的 var 名统一 MAKE_CELL(undefined)，使 var
@@ -364,7 +368,7 @@ impl Emitter {
         // 预载全局属性值），既有属性零动作，值幂等保留。
         // 序言名集 = 顶层 var 名 ∪ 顶层块级函数泄漏名（web-compat 外层绑定同样
         // 在求值前实例化，同走 define-if-absent）。
-        let mut gdi_var_names = self.collect_var_binding_names(&program.body);
+        let mut gdi_var_names = collect_var_binding_names(&program.body);
         gdi_var_names.extend(
             block_fn_names
                 .iter()

crates/oxide_emit/src/stmt/iteration/for_in.rs

@@ -6,6 +6,7 @@
 
 use std::collections::HashSet;
 
+use crate::capture::collect_binding_pattern_names;
 use crate::{CompileCtx, Emitter};
 use oxide_bytecode::opcode::OpCode;
 use oxide_ir::inst::Inst;
@@ -30,7 +31,7 @@ impl Emitter {
         }
         let mut names = HashSet::new();
         for d in &decl.declarations {
-            self.collect_binding_pattern_names(&d.id, &mut names);
+            collect_binding_pattern_names(&d.id, &mut names);
         }
         let mut v: Vec<String> = names.into_iter().collect();
         v.sort();