Serendipity
f5c0650a97
feat: 闭包变量捕获 — 环境结构体 + 堆分配
lambda 可捕获外层变量, 自动构建环境结构体:
let base = 100;
let f = fn(x: i64) -> i64 { return x + base; }; // 捕获 base
f(50); // → 150
全流水线实现:
- Sema: collect_free_vars 遍历 AST 收集自由变量
- AST function: captured/cap_types/cap_count 字段存储捕获信息
- Codegen: 闭包类型改为 struct {fn_ptr: i64, env_ptr: ptr}
- Codegen: lambda 表达式 malloc 环境结构体 + 存储捕获值
- Codegen: 生成函数签名添加 env_ptr 首个参数 (capturing only)
- Codegen: 函数体内通过 GEP 注册捕获变量到 var_table
- Codegen: 闭包调用自动提取 fn_ptr/env_ptr, 条件传递 env
非捕获 lambda 兼容: env_ptr=NULL, 不额外传参
嵌套 lambda 正确处理: 内层不穿透捕获外层变量
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-07 15:24:35 +08:00
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