+struct psi_decl_arg *psi_decl_arg_init(struct psi_decl_type *type, struct psi_decl_var *var);
+void psi_decl_arg_free(struct psi_decl_arg **arg_ptr);
+void psi_decl_arg_dump(int fd, struct psi_decl_arg *arg, unsigned level);
+
+bool psi_decl_arg_validate(struct psi_data *data, struct psi_decl_arg *arg, struct psi_validate_stack *type_stack);
+bool psi_decl_arg_validate_typedef(struct psi_data *data, struct psi_decl_arg *def, struct psi_validate_stack *type_stack);
+
+size_t psi_decl_arg_align(struct psi_decl_arg *darg, size_t *pos, size_t *len);
+size_t psi_decl_arg_get_align(struct psi_decl_arg *darg);
+size_t psi_decl_arg_get_size(struct psi_decl_arg *darg);