- Determine whether the simulator is being used in globals.h

runtime/vm/simulator_arm64.cc

 // Copyright (c) 2014, 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 <setjmp.h>  // NOLINT
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 // Only build the simulator if not compiling for real ARM hardware.
-#if !defined(HOST_ARCH_ARM64)
+#if defined(USING_SIMULATOR)
 
 #include "vm/simulator.h"
 
 #include "vm/assembler.h"
 #include "vm/constants_arm64.h"
 #include "vm/disassembler.h"
 #include "vm/lockers.h"
 #include "vm/native_arguments.h"
 #include "vm/stack_frame.h"
 #include "vm/os_thread.h"
@@ skipping 3509 matching lines @@
   isolate->set_top_exit_frame_info(0);
 
   ASSERT(raw_exception != Object::null());
   set_register(NULL, kExceptionObjectReg, bit_cast<int64_t>(raw_exception));
   set_register(NULL, kStackTraceObjectReg, bit_cast<int64_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
-#endif  // !defined(HOST_ARCH_ARM64)
+#endif  // !defined(USING_SIMULATOR)
 
 #endif  // defined TARGET_ARCH_ARM64