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

runtime/vm/cpu_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 "vm/globals.h"
 
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/cpu.h"
 #include "vm/cpuinfo.h"
 #include "vm/simulator.h"
 
-#if defined(HOST_ARCH_ARM64)
+#if !defined(USING_SIMULATOR)
 #include <sys/syscall.h>  /* NOLINT */
 #include <unistd.h>  /* NOLINT */
 #endif
 
 namespace dart {
 
 void CPU::FlushICache(uword start, uword size) {
-#if defined(HOST_ARCH_ARM64)
+#if !defined(USING_SIMULATOR)
   // Nothing to do. Flushing no instructions.
   if (size == 0) {
     return;
   }
 
   // ARM recommends using the gcc intrinsic __clear_cache on Linux and Android.
   // blogs.arm.com/software-enablement/141-caches-and-self-modifying-code/
   #if defined(__linux__) || defined(ANDROID)
     extern void __clear_cache(char*, char*);
     char* beg = reinterpret_cast<char*>(start);
     char* end = reinterpret_cast<char*>(start + size);
     ::__clear_cache(beg, end);
   #else
     #error FlushICache only tested/supported on Linux and Android
   #endif
 
 #endif
 }
 
 
 const char* CPU::Id() {
   return
-#if !defined(HOST_ARCH_ARM64)
+#if defined(USING_SIMULATOR)
   "sim"
 #endif  // !defined(HOST_ARCH_ARM64)
   "arm64";
 }
 
 
 const char* HostCPUFeatures::hardware_ = NULL;
 #if defined(DEBUG)
 bool HostCPUFeatures::initialized_ = false;
 #endif
 
 
-#if defined(HOST_ARCH_ARM64)
+#if !defined(USING_SIMULATOR)
 void HostCPUFeatures::InitOnce() {
   CpuInfo::InitOnce();
   hardware_ = CpuInfo::GetCpuModel();
 #if defined(DEBUG)
   initialized_ = true;
 #endif
 }
 
 
 void HostCPUFeatures::Cleanup() {
   DEBUG_ASSERT(initialized_);
 #if defined(DEBUG)
   initialized_ = false;
 #endif
   ASSERT(hardware_ != NULL);
   free(const_cast<char*>(hardware_));
   hardware_ = NULL;
   CpuInfo::Cleanup();
 }
 
-#else
+#else  // !defined(USING_SIMULATOR)
 
 void HostCPUFeatures::InitOnce() {
   CpuInfo::InitOnce();
   hardware_ = CpuInfo::GetCpuModel();
 #if defined(DEBUG)
   initialized_ = true;
 #endif
 }
 
 
 void HostCPUFeatures::Cleanup() {
   DEBUG_ASSERT(initialized_);
 #if defined(DEBUG)
   initialized_ = false;
 #endif
   ASSERT(hardware_ != NULL);
   free(const_cast<char*>(hardware_));
   hardware_ = NULL;
   CpuInfo::Cleanup();
 }
-#endif  // defined(HOST_ARCH_ARM64)
+#endif  // !defined(USING_SIMULATOR)
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64