Add IR Types to CTypes struct convertor

ir_to_ctypes.py

@@ -0,0 +1,84 @@
+import ctypes
+from typing import Dict, Type
+from llvmlite import ir
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def ir_type_to_ctypes(ir_type):
+    """Convert LLVM IR type to ctypes type."""
+    if isinstance(ir_type, ir.IntType):
+        width = ir_type.width
+        type_map = {
+            8: ctypes.c_uint8,
+            16: ctypes.c_uint16,
+            32: ctypes.c_uint32,
+            64: ctypes.c_uint64,
+        }
+        if width not in type_map:
+            raise ValueError(f"Unsupported integer width: {width}")
+        return type_map[width]
+
+    elif isinstance(ir_type, ir.ArrayType):
+        count = ir_type.count
+        element_type = ir_type_to_ctypes(ir_type.element)
+        return element_type * count
+
+    elif isinstance(ir_type, ir.PointerType):
+        return ctypes.c_void_p
+
+    else:
+        raise TypeError(f"Unsupported IR type: {ir_type}")
+
+
+def convert_structs_to_ctypes(structs_sym_tab) -> Dict[str, Type[ctypes.Structure]]:
+    """Convert PythonBPF's structs_sym_tab to ctypes.Structure classes."""
+    if not structs_sym_tab:
+        return {}
+
+    ctypes_structs = {}
+
+    for struct_name, struct_type_obj in structs_sym_tab.items():
+        try:
+            fields = []
+            for field_name, field_ir_type in struct_type_obj.fields.items():
+                field_ctypes = ir_type_to_ctypes(field_ir_type)
+                fields.append((field_name, field_ctypes))
+
+            struct_class = type(
+                struct_name,
+                (ctypes.Structure,),
+                {'_fields_': fields, '__module__': 'pylibbpf.ir_to_ctypes', '__doc__': f'Auto-generated ctypes structure for {struct_name}',
+                 '__repr__': lambda self: (
+                    f"<{struct_name} " +
+                    " ".join(f"{name}={getattr(self, name)}" for name, _ in fields) +
+                    ">"
+                )}
+            )
+
+            ctypes_structs[struct_name] = struct_class
+            # Pretty print field info
+            field_info = ", ".join(f"{name}: {typ.__name__}" for name, typ in fields)
+            logger.debug(f"  {struct_name}({field_info})")
+        except Exception as e:
+            logger.error(f"Failed to convert struct '{struct_name}': {e}")
+            raise
+    logger.info(f"Converted struct '{struct_name}' to ctypes")
+    return ctypes_structs
+
+
+def is_pythonbpf_structs(structs) -> bool:
+    """Check if structs dict is from PythonBPF."""
+    if not isinstance(structs, dict) or not structs:
+        return False
+
+    first_value = next(iter(structs.values()))
+    return (
+        hasattr(first_value, 'ir_type') and
+        hasattr(first_value, 'fields') and
+        hasattr(first_value, 'size')
+    )
+
+
+__all__ = ["convert_structs_to_ctypes", "is_pythonbpf_structs"]