- Protect against icount_ overflow in the delay slot and only

runtime/vm/simulator_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
@@ skipping 2010 matching lines @@
   }
   pc_ += Instr::kInstrSize;
 }
 
 
 void Simulator::ExecuteDelaySlot() {
   ASSERT(pc_ != kEndSimulatingPC);
   delay_slot_ = true;
   icount_++;
   Instr* instr = Instr::At(pc_ + Instr::kInstrSize);
-  if (icount_ == FLAG_stop_sim_at) {
+  if ((FLAG_stop_sim_at != 0) && (icount_ == FLAG_stop_sim_at)) {
     SimulatorDebugger dbg(this);
     dbg.Stop(instr, "Instruction count reached");
   }
   InstructionDecode(instr);
   delay_slot_ = false;
 }
 
 
 void Simulator::Execute() {
   if (FLAG_stop_sim_at == 0) {
@@ skipping 186 matching lines @@
   set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception));
   set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS