Adds Runtime call stub and Dart entry stub to ARM64.

runtime/vm/simulator_arm64.h

 // Copyright (c) 2014, 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 ARM64 instructions if we are not generating a native
 // ARM64 binary. This Simulator allows us to run and debug ARM64 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 ARM64 HW platform.
 
 #ifndef VM_SIMULATOR_ARM64_H_
 #define VM_SIMULATOR_ARM64_H_
 
 #ifndef VM_SIMULATOR_H_
 #error Do not include simulator_arm64.h directly; use simulator.h.
 #endif
 
 #include "vm/constants_arm64.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class Isolate;
+class SimulatorSetjmpBuffer;
 
 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();
 
   // Accessors for register state.
-  void set_register(Register reg, int64_t value, R31Type r31t = R31IsUndef);
-  int64_t get_register(Register reg, R31Type r31t = R31IsUndef) const;
-  void set_wregister(Register reg, int32_t value, R31Type r31t = R31IsUndef);
-  int32_t get_wregister(Register reg, R31Type r31t = R31IsUndef) const;
+  // The default value for R31Type has to be R31IsSP because get_register is
+  // accessed from architecture independent code through SPREG without
+  // specifying the type. We also can't translate a dummy value for SPREG into
+  // a real value because the architecture independent code expects SPREG to
+  // be a real register value.
+  void set_register(Register reg, int64_t value, R31Type r31t = R31IsSP);
+  int64_t get_register(Register reg, R31Type r31t = R31IsSP) const;
+  void set_wregister(Register reg, int32_t value, R31Type r31t = R31IsSP);
+  int32_t get_wregister(Register reg, R31Type r31t = R31IsSP) const;
 
   int64_t get_pc() const;
+  int64_t get_last_pc() const;
   void set_pc(int64_t pc);
 
   // Accessor to the internal simulator stack top.
   uword StackTop() const;
 
   // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
   // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
   // native stack.
   uword top_exit_frame_info() const { return top_exit_frame_info_; }
   void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
 
   // 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. The return value is R0. The parameters are placed in
   // R0-3.
   int64_t Call(int64_t entry,
                int64_t parameter0,
                int64_t parameter1,
                int64_t parameter2,
                int64_t parameter3);
 
+  // Runtime and native call support.
+  enum CallKind {
+    kRuntimeCall,
+    kLeafRuntimeCall,
+    kLeafFloatRuntimeCall,
+    kBootstrapNativeCall,
+    kNativeCall
+  };
+  static uword RedirectExternalReference(uword function,
+                                         CallKind call_kind,
+                                         int argument_count);
+
   void Longjmp(uword pc,
                uword sp,
                uword fp,
                RawObject* raw_exception,
                RawObject* raw_stacktrace) {
     UNIMPLEMENTED();
   }
 
  private:
   // Known bad pc value to ensure that the simulator does not execute
   // without being properly setup.
   static const uword kBadLR = -1;
   // A pc value used to signal the simulator to stop execution.  Generally
   // the lr is set to this value on transition from native C code to
   // simulated execution, so that the simulator can "return" to the native
   // C code.
   static const uword kEndSimulatingPC = -2;
 
   // CPU state.
   int64_t registers_[kNumberOfCpuRegisters];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
   // Simulator support.
+  int64_t last_pc_;
   int64_t pc_;
   char* stack_;
   bool pc_modified_;
   intptr_t icount_;
   static int64_t flag_stop_sim_at_;
+  SimulatorSetjmpBuffer* last_setjmp_buffer_;
   uword top_exit_frame_info_;
 
   // Registered breakpoints.
   Instr* break_pc_;
   int64_t break_instr_;
 
   // Illegal memory access support.
   static bool IsIllegalAddress(uword addr) {
     return addr < 64*1024;
   }
@@ skipping 46 matching lines @@
 
   int64_t ExtendOperand(uint8_t reg_size,
                         int64_t value,
                         Extend extend_type,
                         uint8_t amount);
 
   int64_t DecodeShiftExtendOperand(Instr* instr);
 
   bool ConditionallyExecute(Instr* instr);
 
+  void DoRedirectedCall(Instr* instr);
+
   // Decode instructions.
   void InstructionDecode(Instr* instr);
   #define DECODE_OP(op)                                                        \
     void Decode##op(Instr* instr);
   APPLY_OP_LIST(DECODE_OP)
   #undef DECODE_OP
 
   // Executes ARM64 instructions until the PC reaches kEndSimulatingPC.
   void Execute();
 
+  // Longjmp support for exceptions.
+  SimulatorSetjmpBuffer* last_setjmp_buffer() {
+    return last_setjmp_buffer_;
+  }
+  void set_last_setjmp_buffer(SimulatorSetjmpBuffer* buffer) {
+    last_setjmp_buffer_ = buffer;
+  }
+
   friend class SimulatorDebugger;
+  friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_ARM64_H_