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  1. /**
  2.  * @module ccpu
  3.  * @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
  4.  * @brief  CPU implementation. Used as a container for memory and instructions.
  5.  *         Implements an run method to execute the program (= the instructions).
  6.  * @date   10.05.2009
  7.  */
  8.  
  9. #ifdef DEBUG
  10. # include <iostream>
  11. # include <iomanip>
  12. #endif
  13. #include "ccpu.h"
  14. #include "displays.h"
  15.  
  16. using namespace std;
  17.  
  18. CCPU::CCPU(const unsigned cnt)
  19.   : m_regcnt(cnt), m_memory(NULL), m_program(NULL), m_flagzero(false), m_flagsign(false)
  20. {
  21.   /* create registers */
  22.   m_registers = new CDat[cnt];
  23.   for(unsigned i = 0; i < cnt; ++i)
  24.     m_registers[i] = 0;
  25.  
  26.   /* create displays */
  27.   m_displays.insert(new CDisplayWDEZ);
  28.   m_displays.insert(new CDisplayWHEX);
  29. }
  30.  
  31. /*----------------------------------------------------------------------------*/
  32.  
  33. CCPU::~CCPU()
  34. {
  35.   /* delete registers */
  36.   delete[] m_registers;
  37.   m_registers = NULL;
  38.  
  39.   /* delete displays */
  40.   std::set<CDisplay *>::iterator it;
  41.   for (it = m_displays.begin() ; it != m_displays.end(); ++it)
  42.     delete *it;
  43. }
  44.  
  45. /*----------------------------------------------------------------------------*/
  46.  
  47. void CCPU::run()
  48. {
  49.   if (m_memory == NULL)
  50.     throw runtime_error("CPU has no memory");
  51.   if (m_program == NULL)
  52.     throw runtime_error("CPU has no program to execute");
  53.   if (m_regcnt == 0)
  54.     throw runtime_error("CPU has no registers");
  55.  
  56.   bool run = true;
  57.   while(run)
  58.   {
  59.     unsigned pc = static_cast<unsigned>(m_registers[0]);
  60.  
  61.     /* end of the program reached */
  62.     if (pc == m_program->size())
  63.       break;
  64.  
  65.     /* pc is out of bound */
  66.     if (pc > m_program->size())
  67.       throw runtime_error("Programcounter is out of bound");
  68.  
  69.     /* execute instruction */
  70.     (*m_program->at(pc))(this);
  71.     ++m_registers[0];
  72.   }
  73. }
  74.  
  75. /*----------------------------------------------------------------------------*/
  76.  
  77. #if DEBUG
  78. void CCPU::dumpRegisters(std::ostream& out)
  79. {
  80.   out << "[REGISTER DUMP]" << endl;
  81.   for(unsigned i = 0; i < getRegisterCount(); ++i)
  82.   {
  83.     out << "[" << std::setw(4) << std::setfill('0') << i << "]  "
  84.         << m_registers[i] << endl;
  85.   }
  86. }
  87. #endif
  88.  
  89. /* vim: set et sw=2 ts=2: */
  90.