/// <summary>
/// Converts the provided trilean to an I4 stack value, pushes it onto the stack and returns the success
/// dispatcher result.
/// </summary>
/// <param name="context">The current execution context.</param>
/// <param name="result">The trilean value.</param>
/// <returns>The dispatch result.</returns>
protected static DispatchResult ConvertToI4AndReturnSuccess(CilExecutionContext context, Trilean result)
{
var i4Result = new I4Value(result.ToBooleanOrFalse() ? 1 : 0, 0xFFFFFFFEu | (result.IsKnown ? 1u : 0u));
context.ProgramState.Stack.Push(i4Result);
return(DispatchResult.Success());
}
/// <summary>
/// Parses a (partially) known bit string and sets the contents of integer to the parsed result.
/// </summary>
/// <param name="bitString">The bit string to parse.</param>
/// <exception cref="OverflowException"></exception>
public void SetBits(string bitString)
{
Span <byte> backingBits = stackalloc byte[Size];
Span <byte> backingMask = stackalloc byte[Size];
backingMask.Fill(0xFF);
var bits = new BitField(backingBits);
var mask = new BitField(backingMask);
for (int i = 0; i < bitString.Length; i++)
{
Trilean bit = bitString[bitString.Length - i - 1] switch
{
'0' => Trilean.False,
'1' => Trilean.True,
'?' => Trilean.Unknown,
_ => throw new FormatException()
};
if (i >= 8 * backingBits.Length)
{
if (bit.IsUnknown || bit)
{
throw new OverflowException();
}
}
else if (bit.IsKnown)
{
bits[i] = bit.ToBooleanOrFalse();
}
else
{
mask[i] = false;
}
}
SetBits(backingBits, backingMask);
}