diff --git a/lib/core/Handles/HandlesExprCall.py b/lib/core/Handles/HandlesExprCall.py
index 5088b33..729e7bd 100644
--- a/lib/core/Handles/HandlesExprCall.py
+++ b/lib/core/Handles/HandlesExprCall.py
@@ -2516,13 +2516,22 @@ class ExprCallHandle(BaseHandle):
             return
         if Gen.class_parents.get(ClassName):
             return
-        sha1_cls = Gen.ModuleSha1Map.get(ClassName)
+        # 归一化：ClassName 可能带 sha1 前缀（如 "c9b44d17cd621a75.CallGenLib"，
+        # 跨模块 structs 表键），而 class_parents / ModuleSha1Map / _struct_sha1_map
+        # 的键是裸类名。不剥离则查不到父类 → 继承方法 MRO 回退失效 → fail-fast
+        # "Undefined method 'find_func_in_module' in class '...CallGenLib'"。
+        lookup_cls: str = ClassName
+        if len(ClassName) > 17 and ClassName[16] == '.':
+            lookup_cls = ClassName[17:]
+        if Gen.class_parents.get(lookup_cls):
+            return
+        sha1_cls = Gen.ModuleSha1Map.get(lookup_cls)
         if not sha1_cls:
-            sha1_cls = getattr(Gen, '_struct_sha1_map', {}).get(ClassName)
+            sha1_cls = getattr(Gen, '_struct_sha1_map', {}).get(lookup_cls)
         if not sha1_cls:
             return
         try:
-            self.Trans.ImportHandler._TryLoadClassMembersFromPyi(ClassName, f"{sha1_cls}.stub.ll", Gen)
+            self.Trans.ImportHandler._TryLoadClassMembersFromPyi(lookup_cls, f"{sha1_cls}.stub.ll", Gen)
         except Exception:
             pass
 
diff --git a/lib/core/LLVMCG/BaseGen.py b/lib/core/LLVMCG/BaseGen.py
index 3a172e4..25c9931 100644
--- a/lib/core/LLVMCG/BaseGen.py
+++ b/lib/core/LLVMCG/BaseGen.py
@@ -601,6 +601,11 @@ class BaseGenMixin:
 
         顺序: 自身 → 父类1 及祖先 → 父类2 及祖先（先声明父类优先，菱形去重）。
         与 TPV HandlesStruct.get_mro_chain 的语义一致。
+
+        支持带 sha1 前缀的类名（如 "c9b44d17cd621a75.CallGenLib"，跨模块
+        structs 表键）：查 class_parents 前剥离前缀，否则表键（裸类名）不匹配
+        → MRO 链只剩自身 → 继承方法调用 fail-fast "Undefined method
+        'find_func_in_module' in class '...CallGenLib'"（CallGenLib 根因）。
         """
         chain: list[str] = []
         visited: set[str] = set()
@@ -612,7 +617,11 @@ class BaseGenMixin:
                 continue
             visited.add(cur)
             chain.append(cur)
-            parents: list[str] = parents_map.get(cur, [])
+            # 归一化：剥离 "16位hex." 前缀后用裸类名查父类表
+            lookup: str = cur
+            if len(cur) > 17 and cur[16] == '.':
+                lookup = cur[17:]
+            parents: list[str] = parents_map.get(lookup, parents_map.get(cur, []))
             # 父类逆序压栈，保证声明顺序弹出（先访问父类1 的整条链）
             for p in reversed(parents):
                 if p and p not in visited: