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/**
* @module ccpu
* @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
* @brief CPU implementation. Used as a container for memory and instructions.
* Implements an run method to execute the program (= the instructions).
* @date 10.05.2009
*/
#ifdef DEBUG
# include <iostream>
# include <iomanip>
#endif
#include "ccpu.h"
#include "displays.h"
using namespace std;
CCPU::CCPU(const unsigned cnt)
: m_regcnt(cnt), m_memory(NULL), m_program(NULL), m_flagzero(false), m_flagsign(false)
{
/* create registers */
m_registers = new CDat[cnt];
for(unsigned i = 0; i < cnt; ++i)
m_registers[i] = 0;
/* create displays */
m_displays.insert(new CDisplayWDEZ);
m_displays.insert(new CDisplayWHEX);
}
/*----------------------------------------------------------------------------*/
CCPU::~CCPU()
{
/* delete registers */
delete[] m_registers;
m_registers = NULL;
/* delete displays */
std::set<CDisplay *>::iterator it;
for (it = m_displays.begin() ; it != m_displays.end(); ++it)
delete *it;
}
/*----------------------------------------------------------------------------*/
void CCPU::run()
{
if (m_memory == NULL)
throw runtime_error("CPU has no memory");
if (m_program == NULL)
throw runtime_error("CPU has no program to execute");
if (m_regcnt == 0)
throw runtime_error("CPU has no registers");
bool run = true;
while(run)
{
unsigned pc = static_cast<unsigned>(m_registers[0]);
/* end of the program reached */
if (pc == m_program->size())
break;
/* pc is out of bound */
if (pc > m_program->size())
throw runtime_error("Programcounter is out of bound");
/* execute instruction */
(*m_program->at(pc))(this);
++m_registers[0];
}
}
/*----------------------------------------------------------------------------*/
#if DEBUG
void CCPU::dumpRegisters(std::ostream& out)
{
out << "[REGISTER DUMP]" << endl;
for(unsigned i = 0; i < getRegisterCount(); ++i)
{
out << "[" << std::setw(4) << std::setfill('0') << i << "] "
<< m_registers[i] << endl;
}
}
#endif
/* vim: set et sw=2 ts=2: */
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