[tables] Redefine methods for accessing linker tables

Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries.  Abstract away the zero-length arrays, to make a port to icc
easier.

Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.

Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.

1 files changed, 1 insertions, 8 deletions

diff --git a/src/net/netdevice.c b/src/net/netdevice.c
index 9e142d27..9e031497 100644
--- a/src/net/netdevice.c
+++ b/src/net/netdevice.c
@@ -36,12 +36,6 @@
  *
  */
 
-/** Registered network-layer protocols */
-static struct net_protocol net_protocols[0]
-	__table_start ( struct net_protocol, net_protocols );
-static struct net_protocol net_protocols_end[0]
-	__table_end ( struct net_protocol, net_protocols );
-
 /** List of network devices */
 struct list_head net_devices = LIST_HEAD_INIT ( net_devices );
 
@@ -538,8 +532,7 @@ int net_rx ( struct io_buffer *iobuf, struct net_device *netdev,
 	struct net_protocol *net_protocol;
 
 	/* Hand off to network-layer protocol, if any */
-	for ( net_protocol = net_protocols ; net_protocol < net_protocols_end ;
-	      net_protocol++ ) {
+	for_each_table_entry ( net_protocol, NET_PROTOCOLS ) {
 		if ( net_protocol->net_proto == net_proto ) {
 			return net_protocol->rx ( iobuf, netdev, ll_source );
 		}