From c504c1d6937a07b038ad21646eaec51f34684736 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Fri, 16 Oct 2020 14:59:36 +0100 Subject: [PATCH] [interface] Allow for the definition of an unused interface operation Allow an interface operation to be declared as unused. This will perform full type-checking and compilation of the implementing method, without including any code in the resulting object (other than a NULL entry in the interface operations table). The intention is to provide a relatively clean way for interface operation methods to be omitted in builds for which the operation is not required (such as an operation to describe an object using an EFI device path, which would not be required in a non-EFI build). Signed-off-by: Michael Brown --- src/include/ipxe/interface.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/include/ipxe/interface.h b/src/include/ipxe/interface.h index b65002c80..9281aeef5 100644 --- a/src/include/ipxe/interface.h +++ b/src/include/ipxe/interface.h @@ -36,6 +36,21 @@ struct interface_operation { ? op_func : op_func ), \ } +/** + * Define an unused object interface operation + * + * @v op_type Operation type + * @v object_type Implementing method's expected object type + * @v op_func Implementing method + * @ret op Object interface operation + */ +#define UNUSED_INTF_OP( op_type, object_type, op_func ) { \ + .type = NULL, \ + .func = ( ( ( ( typeof ( op_func ) * ) NULL ) == \ + ( ( op_type ## _TYPE ( object_type ) * ) NULL ) ) \ + ? NULL : NULL ), \ + } + /** An object interface descriptor */ struct interface_descriptor { /** Offset of interface within containing object */