allow an immediate of an instruction to reference a symbol that hasn't been seen yet.

[donno]

At the moment the following code doesn't work:

bar:
   bt r2, done
   ; more code here
   j bar
done:
   jr r1

Moving done section and instructions before the use of done, works.

The problem is only a single pass is done such that the symbol table isn't populated at the time it sees done.

Two solutions:

• Perform two passes, 1 for just populating symbols and another for generating the machine code
• Allow references to symbols in the machine code which are substituted with the final values after everything has been read in.