Allow simulator runs on Windows:

runtime/vm/thread_interrupter_win.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 "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/flags.h"
 #include "vm/os.h"
 #include "vm/thread_interrupter.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, thread_interrupter);
 DECLARE_FLAG(bool, trace_thread_interrupter);
 
 #define kThreadError -1
 
 class ThreadInterrupterWin : public AllStatic {
  public:
   static bool GrabRegisters(HANDLE handle, InterruptedThreadState* state) {
     CONTEXT context;
     memset(&context, 0, sizeof(context));
-#if defined(TARGET_ARCH_IA32)
+#if defined(HOST_ARCH_IA32)
     // On IA32, CONTEXT_CONTROL includes Eip, Ebp, and Esp.
     context.ContextFlags = CONTEXT_CONTROL;
-#elif defined(TARGET_ARCH_X64)
+#elif defined(HOST_ARCH_X64)
     // On X64, CONTEXT_CONTROL includes Rip and Rsp. Rbp is classified
     // as an "integer" register.
     context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
 #else
-    UNIMPLEMENTED();
+#error Unsupported architecture.
 #endif
     if (GetThreadContext(handle, &context) != 0) {
-#if defined(TARGET_ARCH_IA32)
+#if defined(HOST_ARCH_IA32)
       state->pc = static_cast<uintptr_t>(context.Eip);
       state->fp = static_cast<uintptr_t>(context.Ebp);
       state->csp = static_cast<uintptr_t>(context.Esp);
       state->dsp = static_cast<uintptr_t>(context.Esp);
-#elif defined(TARGET_ARCH_X64)
+#elif defined(HOST_ARCH_X64)
       state->pc = static_cast<uintptr_t>(context.Rip);
       state->fp = static_cast<uintptr_t>(context.Rbp);
       state->csp = static_cast<uintptr_t>(context.Rsp);
       state->dsp = static_cast<uintptr_t>(context.Rsp);
 #else
-      UNIMPLEMENTED();
+#error Unsupported architecture.
 #endif
       return true;
     }
     return false;
   }
 
 
   static void Interrupt(InterruptableThreadState* state) {
     ASSERT(!OSThread::Compare(GetCurrentThreadId(), state->id));
     HANDLE handle = OpenThread(THREAD_GET_CONTEXT |
@@ skipping 56 matching lines @@
 
 void ThreadInterrupter::RemoveSignalHandler() {
   // Nothing to do on Windows.
 }
 
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)