Initial revision of ARM simulator and (empty) MIPS simulator.

runtime/vm/simulator.h

Index: runtime/vm/simulator.h
===================================================================
--- runtime/vm/simulator.h	(revision 0)
+++ runtime/vm/simulator.h	(revision 0)
@@ -0,0 +1,24 @@
+// 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.
+
+#ifndef VM_SIMULATOR_H_
+#define VM_SIMULATOR_H_
+
+#include "vm/globals.h"
+
+#if defined(TARGET_ARCH_IA32)
+// No simulator used.
+#elif defined(TARGET_ARCH_X64)
+// No simulator used.
+#elif defined(TARGET_ARCH_ARM)
+#define USING_SIMULATOR

[siva, 2013/01/24 02:03:09]

in globals.h we have used the pattern "#define <variable> 1"
There are some inconsistencies with the WIN32 and Android defines.

If HOST_ARCH_ARM and TARGET_ARCH_ARM are defined we don't want USING_SIMULATOR
to be defined right?

You have a #if !defined(HOST_ARCH_ARM) ... #endif wrapping in vm/simulator_arm.h
maybe the wrapping should be moved here into this file or "#define
USING_SIMULATOR 1" moved to vm/simulator_arm.h

[regis, 2013/01/24 21:47:48]

Good point. Fixed.

+#include "vm/simulator_arm.h"
+#elif defined(TARGET_ARCH_MIPS)
+#define USING_SIMULATOR
+#include "vm/simulator_mips.h"

[siva, 2013/01/24 02:03:09]

Ditto comment for the MIPS case.

[regis, 2013/01/24 21:47:48]

Done.

+#else
+#error Unknown architecture.
+#endif
+
+#endif  // VM_SIMULATOR_H_