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

runtime/vm/simulator_mips.h

Index: runtime/vm/simulator_mips.h
===================================================================
--- runtime/vm/simulator_mips.h	(revision 0)
+++ runtime/vm/simulator_mips.h	(revision 0)
@@ -0,0 +1,32 @@
+// 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.
+
+// Declares a Simulator for MIPS instructions if we are not generating a native
+// MIPS binary. This Simulator allows us to run and debug MIPS code generation
+// on regular desktop machines.
+// Dart calls into generated code by "calling" the InvokeDartCode stub,
+// which will start execution in the Simulator or forwards to the real entry
+// on a MIPS HW platform.
+
+#ifndef VM_SIMULATOR_MIPS_H_
+#define VM_SIMULATOR_MIPS_H_
+
+#ifndef VM_SIMULATOR_H_
+#error Do not include simulator_mips.h directly; use simulator.h.
+#endif
+
+namespace dart {
+
+class Simulator {
+ public:
+  Simulator();
+  ~Simulator();
+
+  // Call on program start.
+  static void InitOnce();
+};
+
+}  // namespace dart
+
+#endif  // VM_SIMULATOR_MIPS_H_