Two main options for the design of assembler are:
1. One pass assembler
2. Multi-pass assembler
One pass assemblers generally have problem of "forward referencing" which is resolved by using mulitpasses
design procedure of two pass assebler
J. SINCLAIR has written: 'SORENSEN-FORMAL SPECIFICATION AND DESIGN OF A SIMPLE ASSEMBLER'
Single Pass Assembler A single pass assembler scans the program only once and creates the equivalent binary program. The assembler substitute all of the symbolic instruction with machine code in one pass. AdvantagesEvery source statement needs to be processed once.DisadvantagesWe cannot use any forward reference in our program. Forward ReferenceForward reference means; reference to an instruction which has not yet been encountered by the assembler. In order to handle forward reference, the program needs to be scanned twice. In other words a two pass assembler is needed.
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That would depend on what those specific options are. The options can only be determined by examining the flaws within the current database design of the organisation.
what are the elements of assembly language programming?
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template
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