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package cpu
import BitManipulation as bm
class Registers {
// General purpose registers
var B: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var C: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var D: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var E: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var H: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var L: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
// Special registers
var A: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var F: Int = 0
set(value) {
bm.validateUnsigned8Bit(value)
field = value
}
var SP: Int = 0
set(value) {
bm.validateUnsigned16Bit(value)
field = value
}
var PC: Int = 0
set(value) {
bm.validateUnsigned16Bit(value)
field = value
}
// 16-Bit accessors
var AF: Int
get() {
return bm.bytesToWord(A, F)
}
set(value) {
bm.validateUnsigned16Bit(value)
A = bm.getMsb(value)
F = bm.getLsb(value)
}
var BC: Int
get() {
return bm.bytesToWord(B, C)
}
set(value) {
bm.validateUnsigned16Bit(value)
B = bm.getMsb(value)
C = bm.getLsb(value)
}
var DE: Int
get() {
return bm.bytesToWord(D, E)
}
set(value) {
bm.validateUnsigned16Bit(value)
D = bm.getMsb(value)
E = bm.getLsb(value)
}
var HL: Int
get() {
return bm.bytesToWord(H, L)
}
set(value) {
bm.validateUnsigned16Bit(value)
H = bm.getMsb(value)
L = bm.getLsb(value)
}
fun getAndDecrementHL(): Int {
val currentHL = HL
if(HL > 0x0000) { // TODO - is this correct? Or should it underflow to 0xFFFF?. Also for increment op.
HL--
}
return currentHL
}
fun getAndIncrementHL(): Int {
val currentHL = HL
if(HL < 0xFFFF) {
HL++
}
return currentHL
}
fun decrementAndGetSP(): Int {
return if(SP > 0x0000) {
--SP
} else {
SP
}
}
}
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