+ if ty_info.nonnull_ptr:
+ arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)(((uint64_t)" + ty_info.var_name + ") & ~1);"
+ arg_conv_name = ty_info.var_name + "_conv"
+ else:
+ # We map Option<Trait> as *mut Trait, which we can differentiate from &Trait by the NONNULL_PTR annotation.
+ # We handle the Option<Trait> case here.
+ arg_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv_ptr = NULL;\n"
+ arg_conv += "if (" + ty_info.var_name + " != 0) {\n"
+ arg_conv += "\t" + ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
+ arg_conv += "\t" + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(((uint64_t)" + ty_info.var_name + ") & ~1);"
+ arg_conv += self.consts.trait_struct_inc_refcnt(ty_info).replace("\n", "\n\t")
+ arg_conv += "\n\t" + ty_info.var_name + "_conv_ptr = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n"
+ arg_conv += "\t*" + ty_info.var_name + "_conv_ptr = " + ty_info.var_name + "_conv;\n"
+ arg_conv += "}"
+ arg_conv_name = ty_info.var_name + "_conv_ptr"