// 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.

#include "vm/globals.h"
#if defined(TARGET_ARCH_MIPS)

// Only build the simulator if not compiling for real MIPS hardware.
#if !defined(HOST_ARCH_MIPS)

#include "vm/simulator.h"

#include "vm/assembler.h"
#include "vm/constants_mips.h"
#include "vm/disassembler.h"

namespace dart {

Simulator::Simulator() {
  // Setup simulator support first. Some of this information is needed to
  // setup the architecture state.
  // We allocate the stack here, the size is computed as the sum of
  // the size specified by the user and the buffer space needed for
  // handling stack overflow exceptions. To be safe in potential
  // stack underflows we also add some underflow buffer space.
  stack_ = new char[(Isolate::GetSpecifiedStackSize() +
                     Isolate::kStackSizeBuffer +
                     kSimulatorStackUnderflowSize)];
}


Simulator::~Simulator() {
  Isolate* isolate = Isolate::Current();
  if (isolate != NULL) {
    isolate->set_simulator(NULL);
  }
}


// Get the active Simulator for the current isolate.
Simulator* Simulator::Current() {
  Simulator* simulator = Isolate::Current()->simulator();
  if (simulator == NULL) {
    simulator = new Simulator();
    Isolate::Current()->set_simulator(simulator);
  }
  return simulator;
}


// Sets the register in the architecture state. It will also deal with updating
// Simulator internal state for special registers such as PC.
void Simulator::set_register(Register reg, int32_t value) {
  UNIMPLEMENTED();
}


// Get the register from the architecture state. This function does handle
// the special case of accessing the PC register.
int32_t Simulator::get_register(Register reg) const {
  UNIMPLEMENTED();
  return 0;
}


// Returns the top of the stack area to enable checking for stack pointer
// validity.
uword Simulator::StackTop() const {
  // To be safe in potential stack underflows we leave some buffer above and
  // set the stack top.
  return reinterpret_cast<uword>(stack_) +
      (Isolate::GetSpecifiedStackSize() + Isolate::kStackSizeBuffer);
}


void Simulator::InitOnce() {
}


int64_t Simulator::Call(int32_t entry,
                        int32_t parameter0,
                        int32_t parameter1,
                        int32_t parameter2,
                        int32_t parameter3,
                        int32_t parameter4) {
  UNIMPLEMENTED();
  return 0LL;
}

}  // namespace dart

#endif  // !defined(HOST_ARCH_MIPS)

#endif  // defined TARGET_ARCH_MIPS