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class Registers {
// General purpose registers
var B: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var C: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var D: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var E: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var H: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var L: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
// Special registers
var A: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var F: Int = 0
set(value) {
validateUnsigned8Bit(value)
field = value
}
var SP: Int = 0
set(value) {
validateUnsigned16Bit(value)
field = value
}
var PC: Int = 0
set(value) {
validateUnsigned16Bit(value)
field = value
}
// 16-Bit accessors
var AF: Int
get() {
return bytesToWord(A, F)
}
set(value) {
validateUnsigned16Bit(value)
A = getMsb(value)
F = getLsb(value)
}
var BC: Int
get() {
return bytesToWord(B, C)
}
set(value) {
validateUnsigned16Bit(value)
B = getMsb(value)
C = getLsb(value)
}
var DE: Int
get() {
return bytesToWord(D, E)
}
set(value) {
validateUnsigned16Bit(value)
D = getMsb(value)
E = getLsb(value)
}
var HL: Int
get() {
return bytesToWord(H, L)
}
set(value) {
validateUnsigned16Bit(value)
H = getMsb(value)
L = getLsb(value)
}
private fun bytesToWord(msb: Int, lsb: Int): Int {
return msb.shl(8) + lsb
}
private fun getMsb(value: Int): Int {
return value.shr(8)
}
private fun getLsb(value: Int): Int {
return value.and(0xFF)
}
private fun validateUnsigned8Bit(value: Int) {
if(value < 0 || value > 255) {
throw IllegalArgumentException("Value $value is not an unsigned 8-Bit value")
}
}
private fun validateUnsigned16Bit(value: Int) {
if(value < 0 || value > 65535) {
throw IllegalArgumentException("Value $value is not an unsigned 16-Bit value")
}
}
}
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