diff --git a/App/lib/core/Gen/FuncGenBase.vp b/App/lib/core/Gen/FuncGenBase.vp
index 12943b3..02ad7c1 100644
--- a/App/lib/core/Gen/FuncGenBase.vp
+++ b/App/lib/core/Gen/FuncGenBase.vp
@@ -211,14 +211,18 @@ class FuncGenBase(CallGenBase.CallGenBase):
 
         # 支持的属性：如果缓冲区非空，先追加空格分隔
         if attrs_buf[0] != '\0':
-            self._append_str(attrs_buf, " ")
-        self._append_str(attrs_buf, llvm_name)
+            self._append_str(attrs_buf, " ", 256)
+        self._append_str(attrs_buf, llvm_name, 256)
         return 1
     def _append_str(self, buf: str, s: str,
                     max_len: t.CSizeT = 256) -> None:
         """将字符串追加到 buf 末尾（有界，防 strcpy 越界写穿定长缓冲）"""
         if buf is None or s is None:
             return
+        # 防御：TPV 方法默认参数注册存在缺陷（缺参调用 max_len 落到 0），
+        # 显式兜底为 256，避免有界写入检查误判丢弃全部属性文本。
+        if max_len == 0:
+            max_len = 256
         cur_len: t.CSizeT = string.strlen(buf)
         s_len: t.CSizeT = string.strlen(s)
         stdio.printf("[ATTR]   _append_str: max_len=%zu cur=%zu slen=%zu s='%s'\n", max_len, cur_len, s_len, s)