diff --git a/lib/Projectrans/DeclarationGenerator.py b/lib/Projectrans/DeclarationGenerator.py
index b887c5c..b38844a 100644
--- a/lib/Projectrans/DeclarationGenerator.py
+++ b/lib/Projectrans/DeclarationGenerator.py
@@ -484,7 +484,12 @@ class DeclarationGenerator:
         # NoVTable 类不添加 vtable 指针（即使有方法和父类）
         if has_methods and is_cvtable and not base_has_vtable and not is_novtable:
             member_types.append('i8*')
-        seen_member_names: set[str] = set()
+        # 多继承字段展平：按继承源去重（2026-08-18）——菱形继承不再重复展平
+        # 祖先字段（Generator 同时继承 ClassGenMixin/ClassGenEnum/.../ClassGenBase，
+        # 而它们都继承 ClassGenBase → ClassGenBase 字段被展平 6 次，struct 膨胀
+        # 且 this_adjust/字段 GEP 错位）。每类只展平一次，只取自有字段。
+        # 与 HandlesClassDef._FlattenInherited 保持同一算法。
+        _seen_cls: set[str] = set()
         for base in node.bases:
             base_name: str | None = None
             type_args: list[str] = []
@@ -505,105 +510,12 @@ class DeclarationGenerator:
                         if isinstance(elt, ast.Name):
                             type_args.append(elt.id)
             if base_name and not self._is_marker_base(base_name):
-                base_member_types: list[str]
-                base_seen: set[str]
-                base_member_types, base_seen = self._get_inherited_members(base_name)
-                if type_args:
-                    base_member_types = self._specialize_member_types(base_member_types, type_args)
-                for mt in base_member_types:
-                    member_types.append(mt)
-                seen_member_names.update(base_seen)
-        for item in node.body:
-            if isinstance(item, ast.AnnAssign) and isinstance(item.target, ast.Name):
-                seen_member_names.add(item.target.id)
-        init_members: list[ast.AnnAssign] = []
-        for item in node.body:
-            if isinstance(item, ast.FunctionDef) and item.name == '__init__':
-                for stmt in item.body:
-                    if (isinstance(stmt, ast.AnnAssign)
-                        and isinstance(stmt.target, ast.Attribute)
-                        and isinstance(stmt.target.value, ast.Name)
-                        and stmt.target.value.id == 'self'):
-                        init_members.append(stmt)
-        untyped_self_members: list[ast.Assign] = []
-        for m_name in [m.attr for m in init_members if isinstance(m.target, ast.Attribute)]:
-            seen_member_names.add(m_name)
-        for item in node.body:
-            if isinstance(item, ast.FunctionDef):
-                if hasattr(item, 'type_params') and item.type_params:
-                    continue
-                for stmt in item.body:
-                    if (isinstance(stmt, ast.Assign)
-                        and len(stmt.targets) == 1
-                        and isinstance(stmt.targets[0], ast.Attribute)
-                        and isinstance(stmt.targets[0].value, ast.Name)
-                        and stmt.targets[0].value.id == 'self'):
-                        attr_name: str = stmt.targets[0].attr
-                        if attr_name not in seen_member_names:
-                            seen_member_names.add(attr_name)
-                            untyped_self_members.append(stmt)
-        for item in list(node.body) + init_members + untyped_self_members:
-            if isinstance(item, ast.AnnAssign):
-                # 跳过编译期元数据字段（__provides__/__requires__/__require_must__）
-                if isinstance(item.target, ast.Name) and item.target.id in ('__provides__', '__requires__', '__require_must__'):
-                    continue
-                bit_width: int | None = self._get_bitfield_width(item.annotation)
-                if bit_width is not None:
-                    has_bitfield = True
-                    total_bits += bit_width
-                else:
-                    VarType: str = self._get_type_str(item.annotation, embedded=True)
-                    if IsListAnnotation(item.annotation):
-                        slice_node: ast.AST = item.annotation.slice
-                        is_dynamic: bool = False
-                        if isinstance(slice_node, ast.Tuple) and len(slice_node.elts) == 2:
-                            count_node: ast.AST = slice_node.elts[1]
-                            if isinstance(count_node, ast.Constant) and count_node.value is None:
-                                is_dynamic = True
-                            elif not (isinstance(count_node, ast.Constant) and isinstance(count_node.value, int) and count_node.value > 0):
-                                if not isinstance(count_node, (ast.Name, ast.BinOp)):
-                                    is_dynamic = True
-                        elif not isinstance(slice_node, ast.Tuple):
-                            is_dynamic = True
-                        if is_dynamic:
-                            elem_type: str = self._get_type_str(slice_node if not isinstance(slice_node, ast.Tuple) else slice_node.elts[0], embedded=True)
-                            init_len: int = 0
-                            if isinstance(item.value, ast.List):
-                                init_len = len(item.value.elts)
-                            elif isinstance(item.value, ast.Constant) and isinstance(item.value.value, str):
-                                init_len = len(item.value.value) + 1
-                            VarType = f'[{init_len} x {elem_type}]'
-                        else:
-                            # 固定大小数组: t.CArray[elem_type, count] → [count x elem_type]
-                            if isinstance(slice_node, ast.Tuple) and len(slice_node.elts) == 2:
-                                elem_type: str = self._get_type_str(slice_node.elts[0], embedded=True)
-                                count_val: int = self._get_const_int(slice_node.elts[1])
-                                if count_val > 0:
-                                    VarType = f'[{count_val} x {elem_type}]'
-                            elif isinstance(slice_node, (ast.Attribute, ast.Name, ast.Subscript)):
-                                # 单参数 t.CArray[elem_type] → 指针模式
-                                elem_type: str = self._get_type_str(slice_node, embedded=True)
-                                VarType = f'{elem_type}*'
-                    member_types.append(VarType)
-            elif isinstance(item, ast.Assign):
-                if (len(item.targets) == 1
-                    and isinstance(item.targets[0], ast.Attribute)
-                    and isinstance(item.targets[0].value, ast.Name)
-                    and item.targets[0].value.id == 'self'):
-                    attr_name: str = item.targets[0].attr
-                    if attr_name in seen_member_names:
-                        continue
-                    InferredType: str = 'i32'
-                    if item.value and isinstance(item.value, ast.Constant):
-                        if isinstance(item.value.value, float):
-                            InferredType = 'float'
-                        elif isinstance(item.value.value, bool):
-                            InferredType = 'i8'
-                        elif isinstance(item.value.value, str):
-                            InferredType = 'i8*'
-                    member_types.append(InferredType)
-                else:
-                    member_types.append('i32')
+                self._FlattenInheritedDecl(base_name, _seen_cls, member_types,
+                                           type_args or None)
+        # 自身字段收集（复用 _CollectOwnMemberTypes，与 _FlattenInheritedDecl 一致）
+        _own_types: list[str]
+        _own_types, has_bitfield, total_bits = self._CollectOwnMemberTypes(node)
+        member_types.extend(_own_types)
         if has_bitfield:
             if total_bits <= 8:
                 member_types.insert(0, 'i8')
@@ -776,6 +688,165 @@ class DeclarationGenerator:
                     base_name, child_class_name, child_struct_type,
                     seen_method_names, decls)
 
+    def _CollectOwnMemberTypes(self, node: ast.ClassDef) -> tuple[list[str], bool, int]:
+        """收集类自身声明的字段类型（不含继承字段）。
+
+        与 _generate_class_decl 的字段收集逻辑一致（AnnAssign + __init__/方法内
+        self.attr 赋值）。返回 (types, has_bitfield, total_bits)。
+        供 _FlattenInheritedDecl 按"每类只展平一次 + 只取自有字段"使用，
+        消除菱形继承的重复展平（如 ClassGenBase 41 字段被 ClassGenMixin/
+        ClassGenEnum/.../ClassGenBase 6 个来源重复展平）。
+        """
+        member_types: list[str] = []
+        has_bitfield: bool = False
+        total_bits: int = 0
+        seen_member_names: set[str] = set()
+        for item in node.body:
+            if isinstance(item, ast.AnnAssign) and isinstance(item.target, ast.Name):
+                seen_member_names.add(item.target.id)
+        init_members: list[ast.AnnAssign] = []
+        for item in node.body:
+            if isinstance(item, ast.FunctionDef) and item.name == '__init__':
+                for stmt in item.body:
+                    if (isinstance(stmt, ast.AnnAssign)
+                        and isinstance(stmt.target, ast.Attribute)
+                        and isinstance(stmt.target.value, ast.Name)
+                        and stmt.target.value.id == 'self'):
+                        init_members.append(stmt)
+        untyped_self_members: list[ast.Assign] = []
+        for m_name in [m.attr for m in init_members if isinstance(m.target, ast.Attribute)]:
+            seen_member_names.add(m_name)
+        for item in node.body:
+            if isinstance(item, ast.FunctionDef):
+                if hasattr(item, 'type_params') and item.type_params:
+                    continue
+                for stmt in item.body:
+                    if (isinstance(stmt, ast.Assign)
+                        and len(stmt.targets) == 1
+                        and isinstance(stmt.targets[0], ast.Attribute)
+                        and isinstance(stmt.targets[0].value, ast.Name)
+                        and stmt.targets[0].value.id == 'self'):
+                        attr_name: str = stmt.targets[0].attr
+                        if attr_name not in seen_member_names:
+                            seen_member_names.add(attr_name)
+                            untyped_self_members.append(stmt)
+        for item in list(node.body) + init_members + untyped_self_members:
+            if isinstance(item, ast.AnnAssign):
+                # 跳过编译期元数据字段（__provides__/__requires__/__require_must__）
+                if isinstance(item.target, ast.Name) and item.target.id in ('__provides__', '__requires__', '__require_must__'):
+                    continue
+                bit_width: int | None = self._get_bitfield_width(item.annotation)
+                if bit_width is not None:
+                    has_bitfield = True
+                    total_bits += bit_width
+                else:
+                    VarType: str = self._get_type_str(item.annotation, embedded=True)
+                    if IsListAnnotation(item.annotation):
+                        slice_node: ast.AST = item.annotation.slice
+                        is_dynamic: bool = False
+                        if isinstance(slice_node, ast.Tuple) and len(slice_node.elts) == 2:
+                            count_node: ast.AST = slice_node.elts[1]
+                            if isinstance(count_node, ast.Constant) and count_node.value is None:
+                                is_dynamic = True
+                            elif not (isinstance(count_node, ast.Constant) and isinstance(count_node.value, int) and count_node.value > 0):
+                                if not isinstance(count_node, (ast.Name, ast.BinOp)):
+                                    is_dynamic = True
+                        elif not isinstance(slice_node, ast.Tuple):
+                            is_dynamic = True
+                        if is_dynamic:
+                            elem_type: str = self._get_type_str(slice_node if not isinstance(slice_node, ast.Tuple) else slice_node.elts[0], embedded=True)
+                            init_len: int = 0
+                            if isinstance(item.value, ast.List):
+                                init_len = len(item.value.elts)
+                            elif isinstance(item.value, ast.Constant) and isinstance(item.value.value, str):
+                                init_len = len(item.value.value) + 1
+                            VarType = f'[{init_len} x {elem_type}]'
+                        else:
+                            # 固定大小数组: t.CArray[elem_type, count] → [count x elem_type]
+                            if isinstance(slice_node, ast.Tuple) and len(slice_node.elts) == 2:
+                                elem_type = self._get_type_str(slice_node.elts[0], embedded=True)
+                                count_val: int = self._get_const_int(slice_node.elts[1])
+                                if count_val > 0:
+                                    VarType = f'[{count_val} x {elem_type}]'
+                            elif isinstance(slice_node, (ast.Attribute, ast.Name, ast.Subscript)):
+                                # 单参数 t.CArray[elem_type] → 指针模式
+                                elem_type = self._get_type_str(slice_node, embedded=True)
+                                VarType = f'{elem_type}*'
+                    member_types.append(VarType)
+            elif isinstance(item, ast.Assign):
+                if (len(item.targets) == 1
+                    and isinstance(item.targets[0], ast.Attribute)
+                    and isinstance(item.targets[0].value, ast.Name)
+                    and item.targets[0].value.id == 'self'):
+                    attr_name: str = item.targets[0].attr
+                    if attr_name in seen_member_names:
+                        continue
+                    InferredType: str = 'i32'
+                    if item.value and isinstance(item.value, ast.Constant):
+                        if isinstance(item.value.value, float):
+                            InferredType = 'float'
+                        elif isinstance(item.value.value, bool):
+                            InferredType = 'i8'
+                        elif isinstance(item.value.value, str):
+                            InferredType = 'i8*'
+                    member_types.append(InferredType)
+                else:
+                    member_types.append('i32')
+        return member_types, has_bitfield, total_bits
+
+    def _FlattenInheritedDecl(self, cls_name: str, seen_cls: set, member_types: list[str],
+                              type_args: list[str] | None = None) -> None:
+        """按继承源去重递归展平：继承树每个类只处理一次，每类只贡献自有字段。
+
+        菱形继承（Generator 同时继承 ClassGenMixin/ClassGenEnum/.../ClassGenBase，
+        而它们都继承 ClassGenBase）会让 ClassGenBase 字段被重复展平，导致 stub
+        struct 与运行时 class_members 布局错位（this_adjust 失效崩溃）。本方法与
+        HandlesClassDef 的 _FlattenInherited 保持同一算法。
+        """
+        if cls_name in seen_cls:
+            return
+        seen_cls.add(cls_name)
+        cls_node: ast.ClassDef | None = None
+        for n in ast.iter_child_nodes(self._pyi_tree):
+            if isinstance(n, ast.ClassDef) and n.name == cls_name:
+                cls_node = n
+                break
+        if cls_node is None:
+            cls_node = self._cross_module_class_defs.get(cls_name)
+        if cls_node is None:
+            # 跨模块未知类：回退到完整展平（_get_inherited_members 递归）
+            mts, _ = self._get_inherited_members(cls_name)
+            if type_args:
+                mts = self._specialize_member_types(mts, type_args)
+            member_types.extend(mts)
+            return
+        for base in cls_node.bases:
+            base_name: str | None = None
+            base_type_args: list[str] = []
+            if isinstance(base, ast.Attribute):
+                base_name = base.attr
+            elif isinstance(base, ast.Name):
+                base_name = base.id
+            elif isinstance(base, ast.Subscript):
+                if isinstance(base.value, ast.Attribute):
+                    base_name = base.value.attr
+                elif isinstance(base.value, ast.Name):
+                    base_name = base.value.id
+                slice_node: ast.AST = base.slice
+                if isinstance(slice_node, ast.Name):
+                    base_type_args.append(slice_node.id)
+                elif isinstance(slice_node, ast.Tuple):
+                    for elt in slice_node.elts:
+                        if isinstance(elt, ast.Name):
+                            base_type_args.append(elt.id)
+            if base_name and not self._is_marker_base(base_name):
+                self._FlattenInheritedDecl(base_name, seen_cls, member_types,
+                                           base_type_args or None)
+        own, _hbf, _tbits = self._CollectOwnMemberTypes(cls_node)
+        if type_args:
+            own = self._specialize_member_types(own, type_args)
+        member_types.extend(own)
+
     def _get_inherited_members(self, base_name: str) -> tuple[list[str], set[str]]:
         member_types: list[str] = []
         seen_names: set[str] = set()
diff --git a/lib/core/Handles/HandlesClassDef.py b/lib/core/Handles/HandlesClassDef.py
index 5bb66a7..a0781ce 100644
--- a/lib/core/Handles/HandlesClassDef.py
+++ b/lib/core/Handles/HandlesClassDef.py
@@ -658,20 +658,55 @@ class ClassHandle(BaseHandle):
             # 字段重复——当前项目 Mixin 为兄弟无共享祖先；若未来出现真菱形需改为
             # "按继承源去重"而非"按字段名去重"。
             # ============================================================
+            # 按继承源去重（2026-08-18）：菱形继承（子类同时继承 A、B、D 且
+            # A/B 也继承 D）会让 D 的字段被重复展平。典型：Generator 同时继承
+            # ClassGenMixin/ClassGenEnum/ClassGenGeneric/ClassGenVTable/ClassGenDef/
+            # ClassGenBase，而前 5 个都继承 ClassGenBase → ClassGenBase 41 字段
+            # 被展平 6 次，struct 膨胀且 this_adjust/字段 GEP 全部错位。
+            # 修复：递归展平整个继承树，每个类只处理一次；每类只贡献
+            # "非祖先字段"（class_members[类] 是含祖先的展平结果，需剔除祖先
+            # 部分）。同名字段（如 TempDir 在 CallGenBase/TypeGenBase 各自声明）
+            # 因非继承关系，两个类都贡献，各自保留——符合下方 L654 注释的
+            # "按继承源去重"而非"按字段名去重"。
+            def _FlattenInherited(cls_name: str, _seen_cls: set,
+                                  _out: list, _gen) -> None:
+                if cls_name in _seen_cls:
+                    return
+                _seen_cls.add(cls_name)
+                for _gp in _gen.class_parents.get(cls_name, []) or []:
+                    _FlattenInherited(_gp, _seen_cls, _out, _gen)
+                # 收集该类的全部祖先字段名（含间接），剔除自身已展平结果中
+                # 属于祖先的部分（避免 class_members[类] 里混合的祖先字段重复）
+                _anc_names: set[str] = set()
+                _stack: list[str] = [cls_name]
+                _vis: set[str] = set()
+                while _stack:
+                    _c = _stack.pop()
+                    for _gp in _gen.class_parents.get(_c, []) or []:
+                        if _gp in _vis:
+                            continue
+                        _vis.add(_gp)
+                        _stack.append(_gp)
+                        for _mn, _mt in _gen.class_members.get(_gp, []) or []:
+                            _anc_names.add(_mn)
+                for _mn, _mt in _gen.class_members.get(cls_name, []) or []:
+                    if _mn == '__vtable__':
+                        continue
+                    if _mn in _anc_names:
+                        continue
+                    _out.append((_mn, _mt))
+                    _pd: dict = dict(_gen.class_member_defaults.get(cls_name, {}))
+                    if _mn in _pd:
+                        _gen.class_member_defaults[ClassName][_mn] = _pd[_mn]
+
+            _seen_cls: set[str] = set()
+            _flat: list[tuple] = []
             for ParentClass in ParentClasses:
                 if ParentClass not in class_graph and ParentClass not in Gen.class_members:
                     continue
-                parent_members: list = list(Gen.class_members.get(ParentClass, []))
-                parent_defaults: dict = dict(Gen.class_member_defaults.get(ParentClass, {}))
-                inherited: list[tuple] = []
-                for pm_name, pm_type in parent_members:
-                    if pm_name == '__vtable__':
-                        continue
-                    inherited.append((pm_name, pm_type))
-                    if pm_name in parent_defaults:
-                        Gen.class_member_defaults[ClassName][pm_name] = parent_defaults[pm_name]
-                if inherited:
-                    Gen.class_members[ClassName] = Gen.class_members[ClassName] + inherited
+                _FlattenInherited(ParentClass, _seen_cls, _flat, Gen)
+            if _flat:
+                Gen.class_members[ClassName] = Gen.class_members[ClassName] + _flat
             # ============================================================
             # 多继承方法合并：遍历所有父类（声明顺序）收集方法（短名去重，先声明父类优先），
             # vtable 槽/方法名用"实际定义类.方法"（如 B.get_b，与 TPV 一致），