private void GetOpCodeArg(ReadOnlySpan <byte> program, out string value)
{
if (_pointer >= program.Length)
{
Throw.MissingInstructionArgument(_pointer);
}
value = BinaryConvert.GetString(ref _pointer, program);
}
private IlObject?ReadArguments(InstructionCode instruction, ReadOnlySpan <byte> program, ref int pointer)
{
var address = new IlAddress(pointer);
switch (instruction)
{
case InstructionCode.Ldstr:
{
var arg = BinaryConvert.GetString(ref pointer, program);
return(new IlObject(address, 0, arg));
}
case InstructionCode.Ldloc:
case InstructionCode.Stloc:
case InstructionCode.Ldc_i4:
case InstructionCode.Ldarg:
case InstructionCode.Call:
{
var arg = BinaryConvert.GetInt32(ref pointer, program);
return(new IlObject(address, 0, arg));
}
case InstructionCode.Br:
case InstructionCode.Brfalse:
case InstructionCode.Brtrue:
{
var arg = BinaryConvert.GetInt32(ref pointer, program);
_labelTargets.Add(new IlAddress(arg));
return(new IlObject(address, 0, arg));
}
case InstructionCode.Ret:
case InstructionCode.Add:
case InstructionCode.Ceq:
case InstructionCode.Pop:
case InstructionCode.Nop:
{
return(null);
}
default:
{
Throw.NotSupportedInstruction(pointer, program[pointer - 1]);
return(null);
}
}
}