Introduce dt_maxaggdsize

We are moving to an implementation in which dt_aggregate tracks varID,
keys, and aggregation data for each aggregation found by the consumer.
For sizing purposes, dt_maxaggdsize will track the maximum size for
any aggregation.

Signed-off-by: Eugene Loh <eugene.loh@oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>

libdtrace/dt_impl.h

@@ -298,6 +298,7 @@ struct dtrace_hdl {
 	uint_t dt_maxdvarsize;	/* largest dynamic variable across programs */
 	uint_t dt_maxtuplesize;	/* largest tuple across programs */
 	uint_t dt_maxlvaralloc;	/* largest lvar alloc across pcbs */
+	uint_t dt_maxaggdsize;	/* largest aggregation data sizw */
 	uint_t dt_zerosize;	/* zero region, size */
 	uint_t dt_zerooffset;	/* zero region, offset */
 	dt_tstring_t *dt_tstrings; /* temporary string slots */

libdtrace/dt_map.c

@@ -328,6 +328,10 @@ dt_aggid_add(dtrace_hdl_t *dtp, const dt_ident_t *aid)
 	agg->dtagd_dsize = drecs[DT_AGGDATA_COUNTER].dtrd_size +
 			   drecs[DT_AGGDATA_RECORD].dtrd_size;
 
+	/* update dt_maxaggdsize */
+	if (dtp->dt_maxaggdsize < agg->dtagd_dsize)
+		dtp->dt_maxaggdsize = agg->dtagd_dsize;
+
 	dtp->dt_adesc[id] = agg;
 
 	return 0;