DBC: Adds simdbc64 target, adds arm64 arithmetic overflow logic

runtime/vm/simulator_dbc.h

 // Copyright (c) 2016, 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_DBC_H_
 #define VM_SIMULATOR_DBC_H_
 
 #ifndef VM_SIMULATOR_H_
 #error Do not include simulator_dbc.h directly; use simulator.h.
 #endif
@@ skipping 19 matching lines @@
 // If the handler returns true then Intrinsic bytecode works as a return
 // instruction returning the value in result. Otherwise interpreter proceeds to
 // execute the body of the function.
 typedef bool (*IntrinsicHandler)(Thread* thread,
                                  RawObject** FP,
                                  RawObject** result);
 
 
 class Simulator {
  public:
-  static const uword kSimulatorStackUnderflowSize = 64;
+  static const uword kSimulatorStackUnderflowSize = 0x80;

[zra, 2016/04/22 21:13:27]

I had to make this bigger for stack overflow tests to pass on 64-bit.

 
   Simulator();
   ~Simulator();
 
   // The currently executing Simulator instance, which is associated to the
   // current isolate
   static Simulator* Current();
 
   // Accessors to the internal simulator stack base and top.
   uword StackBase() const { return reinterpret_cast<uword>(stack_); }
@@ skipping 122 matching lines @@
     last_setjmp_buffer_ = buffer;
   }
 
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_DBC_H_