feat:non struct field values can be cast

pythonbpf/expr/expr_pass.py

@@ -666,13 +666,17 @@ def _handle_vmlinux_cast(
     # Cast the integer/value to a pointer to the struct
     # If arg_val is an integer type, we need to inttoptr it
     ptr_type = ir.PointerType()
-    # TODO: add a integer check here later
-    if ctypes_to_ir(arg_type.type.__name__):
-        # Cast integer to pointer
-        casted_ptr = builder.inttoptr(arg_val, ptr_type)
+    # TODO: add a field value type check here
+    print(arg_type)
+    if isinstance(arg_type, Field):
+        if ctypes_to_ir(arg_type.type.__name__):
+            # Cast integer to pointer
+            casted_ptr = builder.inttoptr(arg_val, ptr_type)
+        else:
+            logger.error(f"Unsupported type for vmlinux cast: {arg_type}")
+            return None
     else:
-        logger.error(f"Unsupported type for vmlinux cast: {arg_type}")
-        return None
+        casted_ptr = builder.inttoptr(arg_val, ptr_type)
 
     return casted_ptr, vmlinux_struct_type
 

pythonbpf/type_deducer.py

@@ -18,6 +18,8 @@ mapping = {
     "c_longlong": ir.IntType(64),
     "c_uint": ir.IntType(32),
     "c_int": ir.IntType(32),
+    "c_ushort": ir.IntType(16),
+    "c_short": ir.IntType(16),
     # Not so sure about this one
     "str": ir.PointerType(ir.IntType(8)),
 }

pythonbpf/vmlinux_parser/vmlinux_exports_handler.py

@@ -121,7 +121,12 @@ class VmlinuxHandler:
 
                 # Use bpf_probe_read_kernel for non-context struct field access
                 field_value = self.load_struct_field(
-                    builder, struct_ptr, globvar_ir, field_data, struct_name
+                    builder,
+                    struct_ptr,
+                    globvar_ir,
+                    field_data,
+                    struct_name,
+                    local_sym_tab,
                 )
                 # Return field value and field type
                 return field_value, field_data
@@ -130,7 +135,12 @@ class VmlinuxHandler:
 
     @staticmethod
     def load_struct_field(
-        builder, struct_ptr_int, offset_global, field_data, struct_name=None
+        builder,
+        struct_ptr_int,
+        offset_global,
+        field_data,
+        struct_name=None,
+        local_sym_tab=None,
     ):
         """
         Generate LLVM IR to load a field from a regular (non-context) struct using bpf_probe_read_kernel.
@@ -204,6 +214,7 @@ class VmlinuxHandler:
                     logger.warning("Complex vmlinux field type, using default 64 bits")
 
         # Allocate local storage for the field value
+        # TODO: CRITICAL BUG. alloca cannot be used anywhere other than the basic block
         local_storage = builder.alloca(ir.IntType(int_width))
         local_storage_i8_ptr = builder.bitcast(local_storage, i8_ptr_type)