fix a bug that NEMU take cpt can not stop

src/checkpoint/serializer.cpp

@@ -249,9 +249,14 @@ bool Serializer::shouldTakeCpt(uint64_t num_insts) {
 void Serializer::notify_taken(uint64_t i) {
   Log("Taking checkpoint @ instruction count %lu", i);
   if (profiling_state == SimpointCheckpointing) {
-    simpoint2Weights.erase(simpoint2Weights.begin());
+    Log("simpoint2Weights size: %ld", simpoint2Weights.size());
+    if (!simpoint2Weights.empty()) {
+      simpoint2Weights.erase(simpoint2Weights.begin());
+    }
     if (!simpoint2Weights.empty()) {
         pathManager.incCptID();
+    } else {
+      recvd_manual_oneshot_cpt = true;
     }
 
   } else if (checkpoint_taking) {
@@ -272,6 +277,7 @@ bool try_take_cpt(uint64_t icount) {
   if (serializer.shouldTakeCpt(icount)) {
     serializer.serialize(icount);
     serializer.notify_taken(icount);
+    Log("return true");
     return true;
   }
   return false;

src/cpu/cpu-exec.c

@@ -263,6 +263,9 @@ end_of_bb:
       Logtb("prev pc = 0x%lx, pc = 0x%lx", prev_s->pc, s->pc);
       Logtb("Executed %ld instructions in total, pc: 0x%lx\n", (int64_t) abs_inst_count, prev_s->pc);
     }
+    if (manual_cpt_quit) {
+      Log("unlikely(manual_cpt_quit)=%ld, manual_cpt_quit=%d", unlikely(manual_cpt_quit), manual_cpt_quit);
+    }
 
     if (unlikely(n <= 0)) break;
     if (unlikely(manual_cpt_quit)) break;