stats: Reduce some wasted space for disabled stats.

Unfortunately for now we have the struct itsel,f but it can become
mostly empty.

2 files changed, 48 insertions, 78 deletions

diff --git a/src/core/stats.h b/src/core/stats.h
index ff4db25c..5a2e2831 100644
--- a/src/core/stats.h
+++ b/src/core/stats.h
@@ -1,5 +1,5 @@
 //
-// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -12,6 +12,8 @@
 #define CORE_STATS_H
 
 #include "core/defs.h"
+#include "core/list.h"
+#include "core/platform.h"
 
 // Statistics support.  This is inspired in part by the Solaris
 // kernel stats framework, but we've simplified and tuned it for our use.
@@ -60,6 +62,20 @@ struct nni_stat_info {
 	bool            si_alloc : 1;  // stat string is allocated
 };
 
+#ifdef NNG_ENABLE_STATS
+#define NNI_STAT_FIELDS(var, ...) \
+	static const nni_stat_info var = { __VA_ARGS__ }
+#else
+#define NNI_STAT_FIELDS(var, ...) static const nni_stat_info var
+#endif
+
+#define NNI_STAT_INFO(var, name, desc, type, unit)             \
+	NNI_STAT_FIELDS(var, .si_name = name, .si_desc = desc, \
+	    .si_type = type, .si_unit = unit)
+#define NNI_STAT_ATOMIC(var, name, desc, type, unit)           \
+	NNI_STAT_FIELDS(var, .si_name = name, .si_desc = desc, \
+	    .si_type = type, .si_unit = unit, .si_atomic = true)
+
 // nni_stat_add adds a statistic, but the operation is unlocked, and the
 // add is to an unregistered stats tree.
 void nni_stat_add(nni_stat_item *, nni_stat_item *);
diff --git a/src/sp/transport/udp/udp.c b/src/sp/transport/udp/udp.c
index 0e3b4ae8..fd513386 100644
--- a/src/sp/transport/udp/udp.c
+++ b/src/sp/transport/udp/udp.c
@@ -1347,83 +1347,37 @@ udp_ep_init(udp_ep **epp, nng_url *url, nni_sock *sock, nni_dialer *dialer,
 	nni_aio_init(&ep->resaio, udp_resolv_cb, ep);
 	nni_aio_completions_init(&ep->complq);
 
-	static const nni_stat_info rcv_max_info = {
-		.si_name   = "rcv_max",
-		.si_desc   = "maximum receive size",
-		.si_type   = NNG_STAT_LEVEL,
-		.si_unit   = NNG_UNIT_BYTES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_reorder_info = {
-		.si_name   = "rcv_reorder",
-		.si_desc   = "messages received out of order",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_toobig_info = {
-		.si_name   = "rcv_toobig",
-		.si_desc   = "received messages rejected because too big",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_nomatch_info = {
-		.si_name   = "rcv_nomatch",
-		.si_desc   = "received messages without a matching connection",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_copy_info = {
-		.si_name   = "rcv_copy",
-		.si_desc   = "received messages copied (small)",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_nocopy_info = {
-		.si_name   = "rcv_nocopy",
-		.si_desc   = "received messages zero copy (large)",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info rcv_nobuf_info = {
-		.si_name   = "rcv_nobuf",
-		.si_desc   = "received messages dropped no buffer",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info snd_toobig_info = {
-		.si_name   = "snd_toobig",
-		.si_desc   = "sent messages rejected because too big",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info snd_nobuf_info = {
-		.si_name   = "snd_nobuf",
-		.si_desc   = "sent messages dropped no buffer",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_MESSAGES,
-		.si_atomic = true,
-	};
-	static const nni_stat_info peer_inactive_info = {
-		.si_name   = "peer_inactive",
-		.si_desc   = "connections closed due to inactive peer",
-		.si_type   = NNG_STAT_COUNTER,
-		.si_unit   = NNG_UNIT_EVENTS,
-		.si_atomic = true,
-	};
-	static const nni_stat_info copy_max_info = {
-		.si_name   = "rcv_copy_max",
-		.si_desc   = "threshold to copy instead of loan-up",
-		.si_type   = NNG_STAT_LEVEL,
-		.si_unit   = NNG_UNIT_BYTES,
-		.si_atomic = true,
-	};
+	NNI_STAT_ATOMIC(rcv_max_info, "rcv_max", "maximum receive size",
+	    NNG_STAT_LEVEL, NNG_UNIT_BYTES);
+	NNI_STAT_ATOMIC(copy_max_info, "copy_max",
+	    "threshold to switch to loan-up", NNG_STAT_LEVEL, NNG_UNIT_BYTES);
+	NNI_STAT_ATOMIC(rcv_reorder_info, "rcv_reorder",
+	    "messages received out of order", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(rcv_nomatch_info, "rcv_nomatch",
+	    "messages without a matching connection", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(rcv_toobig_info, "rcv_toobig",
+	    "received messages rejected because too big", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(rcv_copy_info, "rcv_copy",
+	    "received messages copied (small)", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(rcv_nocopy_info, "rcv_nocopy",
+	    "received messages zero copy (large)", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(rcv_nobuf_info, "rcv_nobuf",
+	    "received messages dropped no buffer", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(snd_toobig_info, "snd_toobig",
+	    "sent messages rejected because too big", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(snd_nobuf_info, "snd_nobuf",
+	    "sent messages dropped no buffer", NNG_STAT_COUNTER,
+	    NNG_UNIT_MESSAGES);
+	NNI_STAT_ATOMIC(peer_inactive_info, "peer_inactive",
+	    "connections closed due to inactive peer", NNG_STAT_COUNTER,
+	    NNG_UNIT_EVENTS);
 
 	nni_stat_init(&ep->st_rcv_max, &rcv_max_info);
 	nni_stat_init(&ep->st_copy_max, &copy_max_info);