1 files changed, 11 insertions, 1 deletions
diff --git a/insns.def b/insns.def
index 161dc38e2e..96023a4adf 100644
--- a/insns.def
+++ b/insns.def
@@ -847,11 +847,21 @@ defined
  */
 DEFINE_INSN
 trace
-(rb_num_t nf)
+(rb_num_t nf, VALUE coverage)
 ()
 ()
 {
     rb_event_flag_t flag = nf;
+    if (coverage) {
+	long line = rb_sourceline() - 1;
+	if (RARRAY_PTR(coverage)[line] == Qnil) {
+	    rb_bug("bug");
+	}
+	long count = FIX2LONG(RARRAY_PTR(coverage)[line]) + 1;
+	if (POSFIXABLE(count)) {
+	    RARRAY_PTR(coverage)[line] = LONG2FIX(count);
+	}
+    }
     EXEC_EVENT_HOOK(th, flag, GET_SELF(), 0, 0 /* TODO: id, klass */);
 }