ignore invalid refs in test-range

Author: ckrause

src/cmd/commands.cpp

@@ -759,6 +759,10 @@ void Commands::testRange(const std::string& id) {
       Log::get().warn(std::string(e.what()));
       continue;
     }
+    if (manager.getStats().getTransitiveLength(seq.id) < 0) {
+      Log::get().warn("Skipping invalid program for " + seq.id.string());
+      continue;
+    }
     if (checkRange(seq, program, false) && checkRange(seq, program, true)) {
       numChecked++;
     }

src/mine/stats.cpp

@@ -422,7 +422,12 @@ int64_t Stats::getTransitiveLength(UID id) const {
   int64_t length = program_lengths.at(id);
   auto range = call_graph.equal_range(id);
   for (auto &it = range.first; it != range.second; it++) {
-    length += getTransitiveLength(it->second);
+    auto len = getTransitiveLength(it->second);
+    if (len < 0) {
+      length = -1;
+      break;
+    }
+    length += len;
   }
   visited_programs.erase(id);
   return length;