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debugger.cpp
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debugger.cpp
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//
// Created by pazuzu on 14/04/19.
//
#include "debugger.h"
#include <cstdio>
short Debugger::getByte(u_int16_t opcode)
{
return (opcode & 0x00FF);
}
short Debugger::getNNN(u_int16_t opcode)
{
return (opcode & 0x0FFF);
}
short Debugger::getX(u_int16_t opcode)
{
return (opcode & 0x0F00) >> 8;
}
short Debugger::getY(u_int16_t opcode)
{
return (opcode & 0x00F0) >> 4;
}
short Debugger::getN(u_int16_t opcode)
{
return (opcode & 0x000F);
}
std::string Debugger::getInstruction(u_int16_t opcode, int currentPC)
{
std::string result;
char str[30];
switch (opcode & 0xF000)
{
case 0x0000:
{
switch (opcode & 0x0FF)
{
case 0x00E0:
sprintf(str, "%X: \t\t CLS", currentPC);
break;
case 0x0EE:
sprintf(str, "%X: \t RET", currentPC);
break;
}
}
break;
case 0x1000:
{
short addr = getNNN(opcode);
sprintf(str, "%X: \t JP \t\t%X", currentPC, addr);
}
break;
case 0x2000:
{
short addr = getNNN(opcode);
sprintf(str, "%X: \t CALL \t%X", currentPC, addr);
}
break;
case 0x3000:
{
short regX = getX(opcode);
short kk = getByte(opcode);
sprintf(str, "%X: \t SE \t\tV%X, \t%d", currentPC, regX, kk);
}
break;
case 0x4000:
{
short regX = getX(opcode);
short kk = getByte(opcode);
sprintf(str, "%X: \t SNE \tV%X, \t%d", currentPC, regX, kk);
}
break;
case 0x5000:
{
short regX = getX(opcode);
short regY = getY(opcode);
sprintf(str, "%X: \t SE \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x6000:
{
short regX = getX(opcode);
short kk = getByte(opcode);
sprintf(str, "%X: \t LD \t\tV%X, \t%d", currentPC, regX, kk);
}
break;
case 0x7000:
{
short regX = getX(opcode);
short kk = getByte(opcode);
sprintf(str, "%X: \t ADD \tV%X, \t%d", currentPC, regX, kk);
}
break;
case 0x8000:
{
short regX = getX(opcode);
short regY = getY(opcode);
switch(opcode & 0x000F)
{
case 0x0000:
{
sprintf(str, "%X: \t LD \t\tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0001:
{
sprintf(str, "%X: \t OR \t\tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0002:
{
sprintf(str, "%X: \t AND \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0003:
{
sprintf(str, "%X: \t XOR \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0004:
{
sprintf(str, "%X: \t ADD \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0005:
{
sprintf(str, "%X: \t SUB \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x0006:
{
sprintf(str, "%X: \t SHR \tV%X {, \t V%X}", currentPC, regX, regY);
}
break;
case 0x0007:
{
sprintf(str, "%X: \t SUBN \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0x000E:
{
sprintf(str, "%X: \t SHL \tV%X {, \t V%X}", currentPC, regX, regY);
}
break;
}
}
break;
case 0x9000:
{
short regX = getX(opcode);
short regY = getY(opcode);
sprintf(str, "%X: \t SNE \tV%X, \tV%X", currentPC, regX, regY);
}
break;
case 0xA000:
{
short nnn = getNNN(opcode);
sprintf(str, "%X: \t LD \t\tI, \t %X", currentPC, nnn);
}
break;
case 0xB000:
{
short nnn = getNNN(opcode);
sprintf(str, "%X: \t JP \t\tV0, %X", currentPC, nnn);
}
break;
case 0xC000:
{
short regX = getX(opcode);
short kk = getByte(opcode);
sprintf(str, "%X: \t RND \tV%X, \t%X", currentPC, regX, kk);
}
break;
case 0xD000:
{
short regX = getX(opcode);
short regY = getY(opcode);
short n = getN(opcode);
sprintf(str, "%X: \t DRW \tV%X, \tV%X, \t%d", currentPC, regX, regY, n);
}
break;
case 0xE000:
{
switch(opcode & 0x00FF)
{
case 0x009E:
{
short regX = getX(opcode);
sprintf(str, "%X: \t SKP \tV%X", currentPC, regX);
}
break;
case 0x00A1:
{
short regX = getX(opcode);
sprintf(str, "%X: \t SKNP \tV%X", currentPC, regX);
}
break;
}
}
break;
case 0xF000:
{
short regX = getX(opcode);
switch (opcode & 0x00FF)
{
case 0x0007:
{
sprintf(str, "%X: \t LD \t\tV%X, \tDT", currentPC, regX);
}
break;
case 0x000A:
{
sprintf(str, "%X: \t LD \t\tV%X, \tK", currentPC, regX);
}
break;
case 0x0015:
{
sprintf(str, "%X: \t LD \t\tDT, \tV%X", currentPC, regX);
}
break;
case 0x0018:
{
sprintf(str, "%X: \t LD \t\tST, \tV%X", currentPC, regX);
}
break;
case 0x001E:
{
sprintf(str, "%X: \t ADD \tI, \tV%X", currentPC, regX);
}
break;
case 0x0029:
{
sprintf(str, "%X: \t LD \t\tF, \tV%X", currentPC, regX);
}
break;
case 0x0033:
{
sprintf(str, "%X: \t LD \t\tB, \tV%X", currentPC, regX);
}
break;
case 0x0055:
{
sprintf(str, "%X: \t LD \t\t[I], \tV%X", currentPC, regX);
}
break;
case 0x0065:
{
sprintf(str, "%X: \t LD \t\tV%X, \t[I]", currentPC, regX);
}
break;
}
}
break;
default:
{
sprintf(str, "%X: \t %X", currentPC, opcode);
}
break;
}
result = str;
return result;
}
bool Debugger::isBranchInstruction(u_int16_t opcode)
{
// TODO implement all branch instructions
return (opcode & 0xF000) == 0x2000 || opcode == 0x00EE || (opcode & 0xF000) == 0x1000;
}
void Debugger::drawRAM()
{
int currentPC = *chip8->getPC();
background->setPosition(20, 20 + 320 + 24 + 4);
window->draw(*background);
background->setPosition(360, 20 + 320 + 24 + 4);
window->draw(*background);
if (changeRAMLocation)
{
instructionMarker = currentPC - 2;
changeRAMLocation = false;
}
// check if the next instruction will be a branch instruction
if (isBranchInstruction((chip8->getRAM()[currentPC] << 8) | chip8->getRAM()[currentPC + 1]))
changeRAMLocation = true;
sf::RectangleShape rect(sf::Vector2f(300, 20));
rect.setFillColor(*light);
rect.setPosition(20, 20 + 320 + 24 + 4 + 25 * ((currentPC - instructionMarker) / 2));
window->draw(rect);
int staticInstructionMarker = instructionMarker;
for (int i = 0; i < 10; i ++)
{
short higherByte = chip8->getRAM()[instructionMarker];
short lowerByte = chip8->getRAM()[instructionMarker + 1];
currentInstruction = (higherByte << 8) | lowerByte;
text.setString(getInstruction(currentInstruction, instructionMarker));
text.setPosition(24, 20 + 320 + 24 + i * 25);
if ((currentPC - staticInstructionMarker) / 2 == i)
text.setFillColor(*dark);
else
text.setFillColor(*light);
window->draw(text);
instructionMarker += 2;
}
instructionMarker = staticInstructionMarker;
if ((currentPC - staticInstructionMarker) / 2 >= 9)
changeRAMLocation = true;
short i = ((chip8->getRAM()[currentPC] << 8) | chip8->getRAM()[currentPC + 1]);
if ((i & 0xF000 == 0xE000) && (i & 0x00FF == 0x00A1))
changeRAMLocation = true;
}
void Debugger::drawText(char *str, float x, float y)
{
text.setPosition(x, y);
text.setString(str);
window->draw(text);
}
void Debugger::drawRegistersStatus()
{
char str[20];
text.setFillColor(*light);
// draw registers from V0 to VA
for (int i = 0; i < 10; i ++)
{
sprintf(str, "V%X \t= \t %d", i, *chip8->getRegisterV(i));
drawText(str, 364, 20 + 320 + 24 + i * 25);
}
// draw registers from VB to VF
for (int i = 0; i <= 5; i ++)
{
sprintf(str, "V%X \t= \t %d", i + 0xA, *chip8->getRegisterV(i + 0xA));
drawText(str, 524, 20 + 320 + 24 + i * 25);
}
// draw register I
sprintf(str, " I \t= \t %X", *chip8->getRegisterI());
drawText(str, 524, 514);
// draw program counter
sprintf(str, "PC \t= \t %X", *chip8->getPC());
drawText(str, 524, 539);
// draw stack pointer
sprintf(str, "SP \t= \t %d", *chip8->getSP());
drawText(str, 524, 564);
// draw delay timer
sprintf(str, "DT \t= \t %d", *chip8->getDT());
drawText(str, 524, 589);
}