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Processor.cs
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Processor.cs
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using System.Buffers.Binary;
using System.Globalization;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.Loader;
using System.Text;
using AssEmbly.Resources.Localization;
namespace AssEmbly
{
/// <summary>
/// Executes compiled AssEmbly programs.
/// </summary>
public class Processor : IDisposable
{
#if EXTENSION_SET_EXTERNAL_ASM
public static readonly Type[] ExternalMethodParamTypes =
new Type[3] { typeof(byte[]), typeof(ulong[]), typeof(ulong?) };
#endif
public readonly byte[] Memory;
public readonly ulong[] Registers;
#if V1_CALL_STACK_COMPAT
public readonly bool UseV1CallStack;
#endif
#if EXTENSION_SET_HEAP_ALLOCATE
public readonly bool MapStack;
#endif
#if !EXTENSION_SET_TERMINAL
public readonly bool AutoEcho;
#endif
#if V1_CALL_STACK_COMPAT
private readonly ulong stackCallSize;
#else
private const ulong stackCallSize = 16;
#endif
#if EXTENSION_SET_HEAP_ALLOCATE
private readonly List<Range> _mappedMemoryRanges = new();
public IReadOnlyList<Range> MappedMemoryRanges => _mappedMemoryRanges.AsReadOnly();
#endif
public bool ProgramLoaded { get; private set; }
public bool IsFileOpen => openFile is not null || fileRead is not null || fileWrite is not null;
#if EXTENSION_SET_EXTERNAL_ASM
public bool IsExternalOpen => openExtAssembly is not null || openExtFunction is not null || extLoadContext is not null;
#endif
#if EXTENSION_SET_HEAP_ALLOCATE
public bool AnyRegionsMapped => _mappedMemoryRanges.Count > 2;
#endif
public bool IsClean =>
!IsFileOpen
#if EXTENSION_SET_EXTERNAL_ASM
&& !IsExternalOpen
#endif
#if EXTENSION_SET_HEAP_ALLOCATE
&& !AnyRegionsMapped
#endif
;
private Stream? openFile;
private BinaryReader? fileRead;
private BinaryWriter? fileWrite;
private long openFileSize;
#if EXTENSION_SET_EXTERNAL_ASM
private AssemblyLoadContext? extLoadContext;
private Type? openExtAssembly;
private MethodInfo? openExtFunction;
#endif
#if EXTENSION_SET_FILE_SYSTEM
private IEnumerator<string> directoryListing = Enumerable.Empty<string>().GetEnumerator();
private IEnumerator<string> fileListing = Enumerable.Empty<string>().GetEnumerator();
#endif
private readonly Random rng = new();
// Because C#'s console methods work with potentially multi-byte characters at a time,
// but AssEmbly works with single bytes, we need a queue to store bytes that have been read
// from stdin but are yet to be processed by an AssEmbly read instruction.
private readonly Queue<byte> stdinByteQueue = new();
public const ulong SignBit = unchecked((ulong)long.MinValue);
public Processor(ulong memorySize, ulong entryPoint = 0,
bool useV1CallStack = false, bool mapStack = true, bool autoEcho = false)
{
Memory = new byte[memorySize];
Registers = new ulong[Enum.GetNames(typeof(Register)).Length];
Registers[(int)Register.rpo] = entryPoint;
Registers[(int)Register.rso] = memorySize;
Registers[(int)Register.rsb] = memorySize;
#if EXTENSION_SET_HEAP_ALLOCATE
_mappedMemoryRanges.Add(new Range((long)memorySize, (long)memorySize));
#endif
ProgramLoaded = false;
#if CLI
// AssEmbly stores strings as UTF-8, so console must be set to UTF-8 to render bytes correctly
Console.OutputEncoding = Encoding.UTF8;
#endif
#if V1_CALL_STACK_COMPAT
UseV1CallStack = useV1CallStack;
stackCallSize = useV1CallStack ? 24UL : 16UL;
#endif
#if EXTENSION_SET_HEAP_ALLOCATE
MapStack = mapStack;
#endif
#if EXTENSION_SET_TERMINAL
if (autoEcho)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.AutoEcho;
}
#else
AutoEcho = autoEcho;
#endif
}
~Processor()
{
Dispose();
}
public void Dispose()
{
#if EXTENSION_SET_EXTERNAL_ASM
extLoadContext?.Unload();
extLoadContext = null;
openExtAssembly = null;
openExtFunction = null;
#endif
openFile?.Dispose();
openFile = null;
fileRead?.Dispose();
fileRead = null;
fileWrite?.Dispose();
fileWrite = null;
#if EXTENSION_SET_FILE_SYSTEM
directoryListing.Dispose();
fileListing.Dispose();
#endif
GC.SuppressFinalize(this);
}
/// <summary>
/// Loads a provided compiled program and its data into this processor's memory to be executed.
/// </summary>
/// <param name="programData">The entire program, including any data, to load into memory.</param>
/// <exception cref="InvalidOperationException">
/// Thrown if a program has already been loaded into this processor,
/// or the program is too large to be loaded given the amount of allocated memory.
/// </exception>
public void LoadProgram(byte[] programData)
{
if (ProgramLoaded)
{
throw new InvalidOperationException(Strings_Processor.Error_Already_Loaded);
}
if (programData.LongLength > Memory.LongLength)
{
throw new InvalidOperationException(string.Format(Strings_Processor.Error_Program_Too_Large, Memory.LongLength, programData.LongLength));
}
Array.Copy(programData, Memory, programData.LongLength);
#if EXTENSION_SET_HEAP_ALLOCATE
_mappedMemoryRanges.Insert(0, new Range(0, programData.LongLength));
#endif
ProgramLoaded = true;
}
/// <summary>
/// Execute either a single instruction or execute until a halt instruction is reached,
/// depending on the value of <paramref name="runUntilHalt"/>.
/// </summary>
/// <returns><see langword="true"/> if execution should stop (HLT reached) - otherwise <see langword="false"/></returns>
/// <param name="waitForInputChar">
/// Must not be <see langword="false"/> if console key presses are being used for the RCC instruction.
/// If <see langword="true"/>, RCC becomes a no-op and does not increment rpo if no characters are currently available on the input stream.
/// </param>
/// <exception cref="InvalidOperationException">
/// Thrown if a program hasn't been loaded into this processor, or the processor has reached the end of allocated memory.
/// </exception>
/// <exception cref="InvalidOpcodeException">
/// Thrown if the processor encounters an opcode to execute that didn't match any known opcodes.
/// </exception>
/// <exception cref="ReadOnlyRegisterException">Thrown if an instruction attempts to write to a read-only register.</exception>
/// <exception cref="FileOperationException">
/// Thrown when a file operation is attempted but is not valid given the current state of the processor.
/// </exception>
/// <exception cref="IndexOutOfRangeException">Thrown if an instruction tried to access an invalid memory address.</exception>
/// <exception cref="ArgumentOutOfRangeException">Thrown if an instruction tried to access an invalid memory address.</exception>
/// <exception cref="DivideByZeroException">Thrown if a division instruction is executed with a value of zero as the divisor.</exception>
/// <exception cref="FileNotFoundException">Thrown if an operation that requires a file to exist could not find the target file.</exception>
/// <exception cref="DirectoryNotFoundException">Thrown if an operation that requires a directory to exist could not find the target directory.</exception>
public bool Execute(bool runUntilHalt, Stream? stdoutOverride = null, Stream? stdinOverride = null, bool waitForInputChar = true)
{
if (!ProgramLoaded)
{
throw new InvalidOperationException(Strings_Processor.Error_No_Program);
}
if (Registers[(int)Register.rpo] >= (ulong)Memory.LongLength)
{
throw new InvalidOperationException("The processor has reached the end of accessible memory.");
}
if (!waitForInputChar && stdinOverride is null && !Console.IsInputRedirected)
{
throw new ArgumentException("waitForInputChar cannot be false when characters are being read from console key presses, not a stream.");
}
bool halt = false;
using Stream stdout = stdoutOverride ?? Console.OpenStandardOutput();
using Stream? stdin = stdinOverride ?? (Console.IsInputRedirected ? Console.OpenStandardInput() : null);
do
{
byte extensionSet;
byte opcode;
bool fullOpcode = Memory[Registers[(int)Register.rpo]] == Opcode.FullyQualifiedMarker;
if (fullOpcode)
{
extensionSet = Memory[++Registers[(int)Register.rpo]];
opcode = Memory[++Registers[(int)Register.rpo]];
}
else
{
extensionSet = 0x0;
opcode = Memory[Registers[(int)Register.rpo]];
}
// Upper 4-bytes (general category of instruction)
byte opcodeHigh = (byte)(0xF0 & opcode);
// Lower 4-bytes (specific operation and operand types)
byte opcodeLow = (byte)(0x0F & opcode);
ulong operandStart = ++Registers[(int)Register.rpo];
#if EXTENSION_SET_HEAP_ALLOCATE
ulong oldSO = Registers[(int)Register.rso];
#endif
// Local variables used to hold additional state information while executing instructions
ulong initial;
ulong mathend;
ulong result;
ulong remainder;
ulong byteCount;
int shiftAmount;
string filepath;
long signedInitial;
#if EXTENSION_SET_SIGNED
ulong initialSign;
ulong resultSign;
long signedMathend;
ulong signedShiftAllBits;
#endif
#if EXTENSION_SET_FLOATING_POINT
double floatingInitial;
double floatingMathend;
double floatingResult;
#endif
#if EXTENSION_SET_FILE_SYSTEM
string destination;
#endif
switch (extensionSet)
{
case 0x00: // Base instruction set
switch (opcodeHigh)
{
case 0x00: // Control / Jump
switch (opcodeLow)
{
case 0x0: // HLT (Halt)
halt = true;
break;
case 0x1: // NOP
break;
case 0x2: // JMP adr (Unconditional Jump)
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
break;
case 0x3: // JMP ptr (Unconditional Jump)
Registers[(int)Register.rpo] = ReadMemoryPointer(operandStart, out _);
break;
case 0x4: // JEQ adr (Jump If Equal To - Zero Flag Set)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Zero) != 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0x5: // JEQ ptr (Jump If Equal To - Zero Flag Set)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Zero) != 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
case 0x6: // JNE adr (Jump If Not Equal To - Zero Flag Unset)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Zero) == 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0x7: // JNE ptr (Jump If Not Equal To - Zero Flag Unset)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Zero) == 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
case 0x8: // JLT adr (Jump If Less Than - Carry Flag Set)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Carry) != 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0x9: // JLT ptr (Jump If Less Than - Carry Flag Set)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Carry) != 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
case 0xA: // JLE adr (Jump If Less Than or Equal To - Carry Flag Set or Zero Flag Set)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.ZeroAndCarry) != 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0xB: // JLE ptr (Jump If Less Than or Equal To - Carry Flag Set or Zero Flag Set)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.ZeroAndCarry) != 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
case 0xC: // JGT adr (Jump If Greater Than - Carry Flag Unset and Zero Flag Unset)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.ZeroAndCarry) == 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0xD: // JGT ptr (Jump If Greater Than - Carry Flag Unset and Zero Flag Unset)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.ZeroAndCarry) == 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
case 0xE: // JGE adr (Jump If Greater Than or Equal To - Carry Flag Unset)
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Carry) == 0)
{
Registers[(int)Register.rpo] = ReadMemoryQWord(operandStart);
}
else
{
Registers[(int)Register.rpo] += 8;
}
break;
case 0xF: // JGE ptr (Jump If Greater Than or Equal To - Carry Flag Unset)
result = ReadMemoryPointer(operandStart, out byteCount);
if ((Registers[(int)Register.rsf] & (ulong)StatusFlags.Carry) == 0)
{
Registers[(int)Register.rpo] = result;
}
else
{
Registers[(int)Register.rpo] += byteCount;
}
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Control, opcodeLow));
}
break;
case 0x10: // Addition
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // ADD reg, reg
mathend = ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // ADD reg, lit
mathend = ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // ADD reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // ADD reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // ICR reg
mathend = 1;
Registers[(int)Register.rpo]++;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Addition, opcodeLow));
}
result = initial + mathend;
WriteMemoryRegister(operandStart, result);
if (result < initial)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Carry;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
}
#if EXTENSION_SET_SIGNED
initialSign = initial & SignBit;
resultSign = result & SignBit;
if (initialSign == (mathend & SignBit) && initialSign != resultSign)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Overflow;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
}
if (resultSign != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
#endif
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
break;
case 0x20: // Subtraction
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // SUB reg, reg
mathend = ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // SUB reg, lit
mathend = ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // SUB reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // SUB reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // DCR reg
mathend = 1;
Registers[(int)Register.rpo]++;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Subtraction, opcodeLow));
}
result = initial - mathend;
WriteMemoryRegister(operandStart, result);
if (result > initial)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Carry;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
}
#if EXTENSION_SET_SIGNED
initialSign = initial & SignBit;
resultSign = result & SignBit;
if (initialSign != (mathend & SignBit) && initialSign != resultSign)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Overflow;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
}
if (resultSign != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
#endif
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
break;
case 0x30: // Multiplication
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // MUL reg, reg
mathend = ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // MUL reg, lit
mathend = ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // MUL reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // MUL reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Multiplication, opcodeLow));
}
result = initial * mathend;
WriteMemoryRegister(operandStart, result);
if (result < initial && mathend != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Carry;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
}
#if EXTENSION_SET_SIGNED
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
if ((result & SignBit) != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
#endif
break;
case 0x40: // Division
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // DIV reg, reg
result = initial / ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // DIV reg, lit
result = initial / ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // DIV reg, adr
result = initial / ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // DIV reg, ptr
result = initial / ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // DVR reg, reg, reg
mathend = ReadMemoryRegister(operandStart + 2);
result = initial / mathend;
remainder = initial % mathend;
WriteMemoryRegister(operandStart + 1, remainder);
Registers[(int)Register.rpo] += 3;
break;
case 0x5: // DVR reg, reg, lit
mathend = ReadMemoryQWord(operandStart + 2);
result = initial / mathend;
remainder = initial % mathend;
WriteMemoryRegister(operandStart + 1, remainder);
Registers[(int)Register.rpo] += 10;
break;
case 0x6: // DVR reg, reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 2);
result = initial / mathend;
remainder = initial % mathend;
WriteMemoryRegister(operandStart + 1, remainder);
Registers[(int)Register.rpo] += 10;
break;
case 0x7: // DVR reg, reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 2, out byteCount);
result = initial / mathend;
remainder = initial % mathend;
WriteMemoryRegister(operandStart + 1, remainder);
Registers[(int)Register.rpo] += byteCount + 2;
break;
case 0x8: // REM reg, reg
result = initial % ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x9: // REM reg, lit
result = initial % ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0xA: // REM reg, adr
result = initial % ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0xB: // REM reg, ptr
result = initial % ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Division, opcodeLow));
}
WriteMemoryRegister(operandStart, result);
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
#if EXTENSION_SET_SIGNED
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
if ((result & SignBit) != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
#endif
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
break;
case 0x50: // Shifting
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // SHL reg, reg
shiftAmount = (int)ReadMemoryRegister(operandStart + 1);
result = initial << shiftAmount;
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // SHL reg, lit
shiftAmount = (int)ReadMemoryQWord(operandStart + 1);
result = initial << shiftAmount;
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // SHL reg, adr
shiftAmount = (int)ReadMemoryPointedQWord(operandStart + 1);
result = initial << shiftAmount;
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // SHL reg, ptr
shiftAmount = (int)ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
result = initial << shiftAmount;
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // SHR reg, reg
shiftAmount = (int)ReadMemoryRegister(operandStart + 1);
result = initial >> shiftAmount;
Registers[(int)Register.rpo] += 2;
break;
case 0x5: // SHR reg, lit
shiftAmount = (int)ReadMemoryQWord(operandStart + 1);
result = initial >> shiftAmount;
Registers[(int)Register.rpo] += 9;
break;
case 0x6: // SHR reg, adr
shiftAmount = (int)ReadMemoryPointedQWord(operandStart + 1);
result = initial >> shiftAmount;
Registers[(int)Register.rpo] += 9;
break;
case 0x7: // SHR reg, ptr
shiftAmount = (int)ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
result = initial >> shiftAmount;
Registers[(int)Register.rpo] += byteCount + 1;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Shifting, opcodeLow));
}
// C# only counts the lower 6 bits of the amount to shift by, so values greater than or equal to 64 will not return 0 as
// wanted for AssEmbly.
if (shiftAmount >= 64)
{
result = 0;
}
WriteMemoryRegister(operandStart, result);
// We will never overflow when shifting by 0 bits or if the initial value is 0.
// We will always overflow if shifting by 64 bits or more as long as the above isn't the case.
//
// Otherwise, if shifting left (opcodeLow <= 0x3), "(initial >> (64 - amount)) != 0" checks if there are any 1 bits
// in the portion of the number that will be cutoff during the left shift by cutting off the bits that will remain.
// 8-bit e.g: 0b11001001 << 3 |> (0b11001001 >> (8 - 3)), (0b11001001 >> 5) = 0b00000110, result != 0, therefore set carry.
//
// If shifting right, "(initial << (64 - amount)) != 0" checks if there are any 1 bits
// in the portion of the number that will be cutoff during the right shift by cutting off the bits that will remain.
// 8-bit e.g: 0b11001001 >> 3 |> (0b11001001 << (8 - 3)), (0b11001001 << 5) = 0b00100000, result != 0, therefore set carry.
if (shiftAmount != 0 && initial != 0 && (shiftAmount >= 64 || opcodeLow <= 0x3
? (initial >> (64 - shiftAmount)) != 0
: (initial << (64 - shiftAmount)) != 0))
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Carry;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
}
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
#if EXTENSION_SET_SIGNED
if ((result & SignBit) != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
#endif
break;
case 0x60: // Bitwise
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // AND reg, reg
result = initial & ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // AND reg, lit
result = initial & ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // AND reg, adr
result = initial & ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // AND reg, ptr
result = initial & ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // ORR reg, reg
result = initial | ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x5: // ORR reg, lit
result = initial | ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x6: // ORR reg, adr
result = initial | ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x7: // ORR reg, ptr
result = initial | ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x8: // XOR reg, reg
result = initial ^ ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x9: // XOR reg, lit
result = initial ^ ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0xA: // XOR reg, adr
result = initial ^ ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0xB: // XOR reg, ptr
result = initial ^ ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0xC: // NOT reg
result = ~initial;
Registers[(int)Register.rpo]++;
break;
case 0xD: // RNG reg
result = (ulong)rng.NextInt64(long.MinValue, long.MaxValue);
Registers[(int)Register.rpo]++;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Bitwise, opcodeLow));
}
WriteMemoryRegister(operandStart, result);
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
#if EXTENSION_SET_SIGNED
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
if ((result & SignBit) != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
#endif
break;
case 0x70: // Test
initial = ReadMemoryRegister(operandStart);
switch (opcodeLow)
{
case 0x0: // TST reg, reg
mathend = ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // TST reg, lit
mathend = ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // TST reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x3: // TST reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
case 0x4: // CMP reg, reg
mathend = ReadMemoryRegister(operandStart + 1);
Registers[(int)Register.rpo] += 2;
break;
case 0x5: // CMP reg, lit
mathend = ReadMemoryQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x6: // CMP reg, adr
mathend = ReadMemoryPointedQWord(operandStart + 1);
Registers[(int)Register.rpo] += 9;
break;
case 0x7: // CMP reg, ptr
mathend = ReadMemoryRegisterPointedNumber(operandStart + 1, out byteCount);
Registers[(int)Register.rpo] += byteCount + 1;
break;
default:
throw new InvalidOpcodeException(string.Format(Strings_Processor.Error_Opcode_Low_Base_Comparison, opcodeLow));
}
if (opcodeLow >= 0x4)
{
result = initial - mathend;
if (result > initial)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Carry;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Carry;
}
#if EXTENSION_SET_SIGNED
initialSign = initial & SignBit;
resultSign = result & SignBit;
if (initialSign != (mathend & SignBit) && initialSign != resultSign)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Overflow;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Overflow;
}
#endif
}
else
{
result = initial & mathend;
#if EXTENSION_SET_SIGNED
resultSign = result & SignBit;
#endif
}
#if EXTENSION_SET_SIGNED
if (resultSign != 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Sign;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Sign;
}
#endif
if (result == 0)
{
Registers[(int)Register.rsf] |= (ulong)StatusFlags.Zero;
}
else
{
Registers[(int)Register.rsf] &= ~(ulong)StatusFlags.Zero;
}
break;
case 0x80: // Small Move
switch (opcodeLow)
{
case 0x0: // MVB reg, reg
WriteMemoryRegister(operandStart, 0xFF & ReadMemoryRegister(operandStart + 1));
Registers[(int)Register.rpo] += 2;
break;
case 0x1: // MVB reg, lit
WriteMemoryRegister(operandStart, 0xFF & ReadMemoryQWord(operandStart + 1));
Registers[(int)Register.rpo] += 9;
break;
case 0x2: // MVB reg, adr
WriteMemoryRegister(operandStart, ReadMemoryPointedByte(operandStart + 1));
Registers[(int)Register.rpo] += 9;