| public ContainsLabel ( string label, int fromAddress ) : bool | ||
| label | string | |
| fromAddress | int | |
| return | bool | |
private void SetBranchLabelAddressReferences()
{
foreach (ushort index in Branches.Keys)
{
string labelName = Branches[index];
if (!Scopes.ContainsLabel(labelName, index))
{
throw new Exception($"Unknown label reference '{labelName}'");
}
ushort label_address = (ushort)Scopes.LabelAddress(labelName, index);
int delta = label_address - index;
if ((delta & 0x00000001) != 00)
{
throw new Exception($"Branch to label '{labelName}' is not word aligned");
}
delta /= 2;
if ((delta > sbyte.MaxValue) || (delta < sbyte.MinValue))
{
throw new Exception("Branch operation out of range");
}
Code[index + 1] = (byte)((sbyte)delta);
}
}
private void SetLabelAddressReferences()
{
foreach (ushort index in Labels.Keys)
{
string labelName = Labels[index].ToLowerInvariant();
ushort offset = 0;
GetLabelOffset(ref labelName, ref offset);
if (Scopes.ContainsLabel(labelName, index))
{
ushort address = (ushort)Scopes.LabelAddress(labelName, index);
address += offset;
Code[index] = (byte)(address & 0x00ff);
Code[index + 1] = (byte)((address & 0xff00) >> 8);
}
else if (Scopes.ContainsAlias(labelName, index))
{
ushort address = (ushort)Scopes.AliasAddress(labelName, index);
address += offset;
Code[index] = (byte)(address & 0x00ff);
Code[index + 1] = (byte)((address & 0xff00) >> 8);
}
else
{
throw new Exception($"Unresolved label or alias: {labelName} with offset of {offset}");
}
}
}
private void SetDataFieldLabelAddressReferences()
{
foreach (ushort key in DataFields.Keys)
{
string labelName = DataFields[key].ToLowerInvariant();
if (Scopes.ContainsLabel(labelName, key) != true)
{
throw new Exception($"Unknown label '{labelName}' referenced in data field");
}
ushort address = (ushort)Scopes.LabelAddress(labelName, key);
Code[key] = (byte)(address & 0x00ff);
Code[key + 1] = (byte)((address & 0xff00) >> 8);
}
}