private static long GetValueForInput(IIntCodeMemory workingMemory, long relativeBase, InstructionMode modeParam, long input)
{
return(modeParam switch
{
InstructionMode.PositionMode => workingMemory[input],
InstructionMode.ImmediateMode => input,
InstructionMode.RelativeMode => workingMemory[relativeBase + input],
_ => throw new Exception("Unexpected instruction mode"),
});
private static long HandleAdjustRelativeBaseCommand(IIntCodeMemory workingMemory, long relativeBase, long programPosition, InstructionMode modeParam1)
{
long input1 = workingMemory[programPosition + 1];
long value1 = GetValueForInput(workingMemory, relativeBase, modeParam1, input1);
relativeBase += value1;
return(relativeBase);
}
private static void HandleOutputCommand(Action <long>?output, IIntCodeMemory workingMemory, long relativeBase, long programPosition, InstructionMode modeParam1)
{
long input1 = workingMemory[programPosition + 1];
long param1 = GetValueForInput(workingMemory, relativeBase, modeParam1, input1);
if (output == null)
{
throw new Exception("Program is expecting Output to be wired up");
}
output(param1);
}
private static void HandleAdditionOrMultiplicationCommands(IIntCodeMemory workingMemory, long programPosition, long relativeBase, IntInstruction instruction, InstructionMode modeParam1, InstructionMode modeParam2, InstructionMode modeParam3)
{
long input1 = workingMemory[programPosition + 1];
long value1 = GetValueForInput(workingMemory, relativeBase, modeParam1, input1);
long input2 = workingMemory[programPosition + 2];
long value2 = GetValueForInput(workingMemory, relativeBase, modeParam2, input2);
long input3 = workingMemory[programPosition + 3];
long result = instruction switch
{
IntInstruction.Add => value1 + value2,
IntInstruction.Multiply => value1 * value2,
_ => throw new Exception("Unrecognized IntInstruction"),
};
WriteResultToWorkingMemory(result, workingMemory, relativeBase, modeParam3, input3);
}
private static void HandleInputCommand(Func <long>?input, IIntCodeMemory workingMemory, long relativeBase, long programPosition, InstructionMode modeParam1)
{
if (input == null)
{
throw new Exception("Program is expecting Input to be wired up");
}
long input1 = workingMemory[programPosition + 1];
WriteResultToWorkingMemory(input(), workingMemory, relativeBase, modeParam1, input1);
}
private static void HandleJumpCommands(IIntCodeMemory workingMemory, ref int sizeOfInstruction, long relativeBase, ref long programPosition, IntInstruction instruction, InstructionMode modeParam1, InstructionMode modeParam2)
{
long input1 = workingMemory[programPosition + 1];
long param1 = GetValueForInput(workingMemory, relativeBase, modeParam1, input1);
long input2 = workingMemory[programPosition + 2];
long param2 = GetValueForInput(workingMemory, relativeBase, modeParam2, input2);
if ((instruction == IntInstruction.JumpIfTrue && (param1 != 0)) ||
(instruction == IntInstruction.JumpIfFalse && (param1 == 0)))
{
programPosition = param2;
sizeOfInstruction = 0;
}
}
private static void HandleComparisonCommands(IIntCodeMemory workingMemory, long relativeBase, long programPosition, IntInstruction instruction, InstructionMode modeParam1, InstructionMode modeParam2, InstructionMode modeParam3)
{
long input1 = workingMemory[programPosition + 1];
long value1 = GetValueForInput(workingMemory, relativeBase, modeParam1, input1);
long input2 = workingMemory[programPosition + 2];
long value2 = GetValueForInput(workingMemory, relativeBase, modeParam2, input2);
long input3 = workingMemory[programPosition + 3];
var result = instruction switch
{
IntInstruction.LessThan => value1 < value2 ? 1 : 0,
IntInstruction.Equals => value1 == value2 ? 1 : 0,
_ => throw new Exception("Unexpected instruction")
};
WriteResultToWorkingMemory(result, workingMemory, relativeBase, modeParam3, input3);
}
/*
* Modes:
* 0: A .... Accumulator OPC A operand is AC (implied single byte instruction)
* 1: abs .... absolute OPC $LLHH operand is address $HHLL *
* 2: abs,X .... absolute, X-indexed OPC $LLHH,X operand is address; effective address is address incremented by X with carry **
* 3: abs,Y .... absolute, Y-indexed OPC $LLHH,Y operand is address; effective address is address incremented by Y with carry **
* 4: # .... immediate OPC #$BB operand is byte BB
* 5: impl .... implied OPC operand implied
* 6: ind .... indirect OPC ($LLHH) operand is address; effective address is contents of word at address: C.w($HHLL)
* 7: X,ind .... X-indexed, indirect OPC ($LL,X) operand is zeropage address; effective address is word in (LL + X, LL + X + 1), inc. without carry: C.w($00LL + X)
* 8: ind,Y .... indirect, Y-indexed OPC ($LL),Y operand is zeropage address; effective address is word in (LL, LL + 1) incremented by Y with carry: C.w($00LL) + Y
* 9: rel .... relative OPC $BB branch target is PC + signed offset BB ***
* 10: zpg .... zeropage OPC $LL operand is zeropage address (hi-byte is zero, address = $00LL)
* 11: zpg,X .... zeropage, X-indexed OPC $LL,X operand is zeropage address; effective address is address incremented by X without carry **
* 12: zpg,Y .... zeropage, Y-indexed OPC $LL,Y operand is zeropage address; effective address is address incremented by Y without carry **
*
* 13: internal
*/
public InstructionCaller(Func <InstructionMode, int> method, InstructionMode mode)
{
this.method = method;
this.mode = mode;
}
private void getOper(InstructionMode mode)
{
byte ll;
byte hh;
switch (mode)
{
case InstructionMode.A:
this.oper = -0x100;
this.pageChange = (byte)0;
return;
case InstructionMode.abs:
ll = this.getCurrent();
this.incrPc();
hh = this.getCurrent();
this.incrPc();
this.oper = 0x100 * hh + ll;
this.pageChange = (byte)0;
return;
case InstructionMode.absX:
ll = this.getCurrent();
this.incrPc();
hh = this.getCurrent();
this.incrPc();
this.oper = (hh * 0x100 + ll + this.x) % 0x10000;
this.pageChange = (byte)(ll + this.x > 0xff ? 1 : 0);
return;
case InstructionMode.absY:
ll = this.getCurrent();
this.incrPc();
hh = this.getCurrent();
this.incrPc();
this.oper = (hh * 0x100 + ll + this.y) % 0x10000;
this.pageChange = (byte)(ll + this.y > 0xff ? 1 : 0);
return;
case InstructionMode.imm:
this.oper = -0x200 - this.getCurrent();
this.incrPc();
this.pageChange = (byte)0;
return;
case InstructionMode.impl:
this.oper = -1;
this.pageChange = (byte)0;
return;
case InstructionMode.ind: // only used by JMP
ll = this.getCurrent();
this.incrPc();
hh = this.getCurrent();
this.incrPc();
this.oper = 0x100 * hh + ll;
this.pageChange = (byte)0;
return;
case InstructionMode.Xind: // X,ind
ll = this.getCurrent();
this.incrPc();
this.oper = this[(ll + this.x) % 0x100] + 0x100 * this[(ll + this.x + 1) % 0x100];
this.pageChange = (byte)0;
return;
case InstructionMode.indY: // ind,Y
ll = this.getCurrent();
this.incrPc();
int effective_low = this[ll];
int effective_high = this[(ll + 1) % 0x100] * 0x100;
this.oper = (effective_high + effective_low + this.y) % 0x10000;
this.pageChange = (byte)(effective_low + this.y > 0xff ? 1 : 0);
return;
case InstructionMode.rel: // rel
this.oper = this.getCurrent();
this.incrPc();
this.pageChange = (byte)0;
return;
case InstructionMode.zpg: // zpg
ll = this.getCurrent();
this.incrPc();
this.oper = ll;
this.pageChange = (byte)0;
return;
case InstructionMode.zpgX: // zpg,X
ll = this.getCurrent();
this.incrPc();
this.oper = (ll + this.x) % 0x100;
this.pageChange = (byte)0;
return;
case InstructionMode.zpgY: // zpg,Y
ll = this.getCurrent();
this.incrPc();
this.oper = (ll + this.y) % 0x100;
this.pageChange = (byte)0;
return;
default:
throw new Exception("Unknown mode: " + mode);
}
}
