We discussed one-pass assemblers as though instruction operands could only be single symbols. How could a...
We discussed one-pass assemblers as though instruction operands
could only be single symbols. How could a one-pass assembler handle
an instructino like
JEQ ENDFIL+3
Where ENDFIL has not yet been defined?
Homework Answers
If the ENDFIL symbol is not yet defined the forward reference in one pass assembler takes place :
- The forward reference excludes the operand address if the symbol is not defined
- The symbol is indicated as undefined and stored in SYMTAB
- The address of the operand is added in forward references including the SYMTAB entry
- If the definition of the symbol is found the address in inserted in the reference list
- If the definition of the symbol is not found in till the end of program it is indicated as undefined symbol and error is reported .
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