From: Brian Norris <banorris@uci.edu>
Date: Tue, 4 Sep 2012 17:59:47 +0000 (-0700)
Subject: action: print '?' for unknown read-from-future
X-Git-Tag: pldi2013~243
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=model-checker.git;a=commitdiff_plain;h=672a04a0620a9fbad1c01965cab4089c58b8e581

action: print '?' for unknown read-from-future

To provide more informative debugging traces, use a placeholder '?' as the "Rf"
value when printing a 'read' ModelAction that has no reads-from value. This
helps, for instance, when manually identifying problem points in an infeasible
execution.
---

diff --git a/action.cc b/action.cc
index a321a85..692d14c 100644
--- a/action.cc
+++ b/action.cc
@@ -265,8 +265,12 @@ void ModelAction::print(void) const
 
 	printf("(%3d) Thread: %-2d   Action: %-13s   MO: %7s  Loc: %14p  Value: %-12" PRIu64,
 			seq_number, id_to_int(tid), type_str, mo_str, location, valuetoprint);
-	if (reads_from)
-		printf(" Rf: %d", reads_from->get_seq_number());
+	if (is_read()) {
+		if (reads_from)
+			printf(" Rf: %d", reads_from->get_seq_number());
+		else
+			printf(" Rf: ?");
+	}
 	if (cv) {
 		printf("\t");
 		cv->print();