Add message at top of codegen files to avoid overwriting them

codegen/datatypes.py

@@ -202,7 +202,12 @@ class CFile:
             outfile.write(str(self))
 
     def __str__(self) -> str:
-        return ""
+        return """\
+/**
+ * THIS FILE IS AUTOMATICALLY GENERATED. ANY MODIFICATIONS TO IT WILL BE OVERWRITTEN
+ */
+
+"""
 
 
 @dataclass
@@ -237,7 +242,17 @@ class CHeader(CFile):
         for func in self.funcs:
             funcs += func.declare()
 
-        return header_guard_open + includes + c_linkage_open + forward_declarations + types + funcs + c_linkage_close + header_guard_close
+        return (
+            super().__str__() +
+            header_guard_open +
+            includes +
+            c_linkage_open +
+            forward_declarations +
+            types +
+            funcs +
+            c_linkage_close +
+            header_guard_close
+        )
 
 
 @dataclass
@@ -274,7 +289,15 @@ class CSource(CFile):
         for func in self.funcs:
             funcs += func.define()
 
-        return includes + forward_declarations + types + internal_funcs_decl + funcs + internal_funcs_def
+        return (
+            super().__str__() +
+            includes +
+            forward_declarations +
+            types +
+            internal_funcs_decl +
+            funcs +
+            internal_funcs_def
+        )
 
 
 def get_datatype_string(_type: CDataType) -> str: