protected override void Parse(AsmParser parser)
{
Register = parser.ReadRegW24();
parser.ReadToken(TokenType.Comma);
Token exprToken;
var imm = parser.CalculateExpression(out exprToken);
if (imm > 63) {
throw new TokenException("value must be less than 64", exprToken);
}
Value = (byte)imm;
}
protected override void Parse(AsmParser parser)
{
Token firstToken;
var offset = parser.CalculateExpression(out firstToken);
var zeroOffset = parser.CurrentOffset + 2;
var delta = offset - zeroOffset;
if ((delta & 0x1) > 0) {
throw new TokenException("invalid relative jump", firstToken);
}
delta /= 2;
if (delta < -2048 || delta > 2047) {
throw new TokenException("relative jump out of range (-2047; 2048)", firstToken);
}
delta *= 2;
Delta = (short)delta;
}
protected override void Parse(AsmParser parser)
{
Token firstToken;
var target = parser.CalculateExpression(out firstToken);
if ((target & 0x1) > 0) {
throw new TokenException("invalid absolute jump", firstToken);
}
target /= 2;
//todo: for 64k devices limit is 64k
if (target < 0 || target >= (1 << 22)) {
throw new TokenException("jump beyond 4m boundary", firstToken);
}
Target = (int)(target << 1);
}