correct mistake in null pointer. Also identify error in pointer to char debug info generation

Author: varun-r-mallya

pythonbpf/vmlinux_parser/ir_gen/debug_info_gen.py

@@ -78,6 +78,7 @@ def _get_field_debug_type(
     """
     # Handle complex types (arrays, pointers)
     if field.ctype_complex_type is not None:
+        print(field)
         if issubclass(field.ctype_complex_type, ctypes.Array):
             # Handle array types
             element_type, base_type_size = _get_basic_debug_type(
@@ -89,6 +90,7 @@ def _get_field_debug_type(
         elif issubclass(field.ctype_complex_type, ctypes._Pointer):
             # Handle pointer types
             pointee_type, _ = _get_basic_debug_type(field.containing_type, generator)
+            print("DEBUG", pointee_type)
             return generator.create_pointer_type(pointee_type), 64
 
     # Handle other vmlinux types (nested structs)
@@ -156,7 +158,6 @@ def _get_basic_debug_type(ctype, generator: DebugInfoGenerator) -> Any:
         char_type = generator.get_basic_type("char", 8, dc.DW_ATE_signed_char), 8
         return generator.create_pointer_type(char_type)
     elif ctype == ctypes.c_void_p:
-        void_type = generator.module.add_debug_info("DIBasicType", {"name": "void"})
-        return generator.create_pointer_type(void_type), 64
+        return generator.create_pointer_type(None), 64
     else:
         return generator.get_uint64_type(), 64

tests/c-form/ex7.bpf.c

@@ -19,7 +19,7 @@ struct {
 SEC("tp/syscalls/sys_enter_setuid")
 int handle_setuid_entry(struct trace_event_raw_sys_enter *ctx) {
   struct event data = {};
-
+  struct blk_integrity_iter it = {};
   // Extract UID from the syscall arguments
   data.uid = (unsigned int)ctx->args[0];
   data.ts = bpf_ktime_get_ns();

tests/passing_tests/vmlinux/simple_struct_test.py

@@ -1,6 +1,9 @@
 from pythonbpf import bpf, section, bpfglobal, compile_to_ir, compile
 from vmlinux import TASK_COMM_LEN  # noqa: F401
 from vmlinux import struct_trace_event_raw_sys_enter  # noqa: F401
+# from vmlinux import struct_xdp_md
+# from vmlinux import struct_request
+from vmlinux import struct_blk_integrity_iter
 from ctypes import c_int64
 
 
@@ -24,4 +27,3 @@ def LICENSE() -> str:
 
 
 compile_to_ir("simple_struct_test.py", "simple_struct_test.ll")
-compile()