fix context debug info repetition circular reference error

Author: varun-r-mallya

pythonbpf/functions/function_debug_info.py

@@ -49,16 +49,27 @@ def generate_function_debug_info(
                 "The first argument should always be a pointer to a struct or a void pointer"
             )
         context_debug_info = VmlinuxHandlerRegistry.get_struct_debug_info(annotation.id)
+
+        # Create pointer to context this must be created fresh for each function
+        # to avoid circular reference issues when the same struct is used in multiple functions
         pointer_to_context_debug_info = generator.create_pointer_type(
             context_debug_info, 64
         )
+
+        # Create subroutine type - also fresh for each function
         subroutine_type = generator.create_subroutine_type(
             return_type, pointer_to_context_debug_info
         )
+
+        # Create local variable - fresh for each function with unique name
         context_local_variable = generator.create_local_variable_debug_info(
             leading_argument_name, 1, pointer_to_context_debug_info
         )
+
         retained_nodes = [context_local_variable]
+        logger.info(f"Generating debug info for function {func_node.name}")
+
+        # Create subprogram with is_distinct=True to ensure each function gets unique debug info
         subprogram_debug_info = generator.create_subprogram(
             func_node.name, subroutine_type, retained_nodes
         )

tests/failing_tests/vmlinux/i32_test.py

@@ -3,6 +3,12 @@
 from vmlinux import struct_xdp_md
 from vmlinux import XDP_PASS
 
+@bpf
+@section("xdp")
+def print_xdp_dat2a(ct2x: struct_xdp_md) -> c_int64:
+    data = ct2x.data  # 32-bit field: packet start pointer
+    print(f"ct2x->data = {data}")
+    return c_int64(XDP_PASS)
 
 @bpf
 @section("xdp")
@@ -12,13 +18,6 @@ def print_xdp_data(ctx: struct_xdp_md) -> c_int64:
     print(f"ctx->data = {something}")
     return c_int64(XDP_PASS)
 
-@bpf
-@section("xdp")
-def print_xdp_dat2a(ct2x: struct_xdp_md) -> c_int64:
-    data = ct2x.data  # 32-bit field: packet start pointer
-    print(f"ct2x->data = {data}")
-    return c_int64(XDP_PASS)
-
 @bpf
 @bpfglobal
 def LICENSE() -> str: