feat: 实现 SequenceExpression + 带标签 break/continue + EmptyStatement

crates/oxide_compiler/src/counter/stmt/basic.rs

@@ -23,4 +23,27 @@ impl Compiler {
     pub(in crate::counter) fn count_continue_statement(&self, ctx: &mut CompileCtx) {
         ctx.projected_pc += 1; // JMP
     }
+
+    pub(in crate::counter) fn count_labeled_statement(
+        &self, stmt: &oxide_parser::LabeledStatement<'_>, ctx: &mut CompileCtx,
+    ) {
+        let body_is_loop = matches!(
+            stmt.body,
+            Statement::WhileStatement(_)
+                | Statement::DoWhileStatement(_)
+                | Statement::ForStatement(_)
+                | Statement::ForInStatement(_)
+                | Statement::ForOfStatement(_)
+        );
+        if body_is_loop {
+            // Loop body owns its labels; labeled break/continue reuse them.
+            self.count_statement(&stmt.body, ctx);
+        } else {
+            // Non-loop label: consume one id (parity with emit) and place the
+            // LabeledEnd target right after the body for `break label`.
+            let id = ctx.next_label_id();
+            self.count_statement(&stmt.body, ctx);
+            ctx.label_map.insert(Label::LabeledEnd(id), ctx.projected_pc);
+        }
+    }
 }

crates/oxide_compiler/src/counter/stmt/mod.rs

@@ -28,6 +28,7 @@ impl Compiler {
             Statement::ClassDeclaration(class) => self.count_class_declaration(class, ctx),
             Statement::ThrowStatement(ts) => self.count_throw_statement(ts, ctx),
             Statement::TryStatement(ts) => self.count_try_statement(ts, ctx),
+            Statement::LabeledStatement(ls) => self.count_labeled_statement(ls, ctx),
             _ => {}
         }
     }