Compile and simulate first dart function on arm generated from ast.

runtime/vm/simulator_mips.h

 // 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:
+  static const uword kSimulatorStackUnderflowSize = 64;
+
   Simulator();
   ~Simulator();
 
   // The currently executing Simulator instance, which is associated to the
   // current isolate
   static Simulator* Current();
 
+  // Accessor to the internal simulator stack top.
+  uword StackTop() const;
+
   // Call on program start.
   static void InitOnce();
 
   // Dart generally calls into generated code with 5 parameters. This is a
   // convenience function, which sets up the simulator state and grabs the
   // result on return.
   int64_t Call(int32_t entry,
                int32_t parameter0,
                int32_t parameter1,
                int32_t parameter2,
                int32_t parameter3,
                int32_t parameter4);
+
+ private:
+  char* stack_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_MIPS_H_