Question

Discuss the advantages and disadvantages of one pass assembler

Answer 1

Advantages:
One-pass assemblers are used when

it is necessary or desirable to avoid a second pass over the source program the external storage for the intermediate file between two passes is slow or is inconvenient to use

Disadvantages:

Main problem: Forward references to both data and instructions. One simple way to eliminate this problem: require that all areas be defined before they are referenced.It is possible, although inconvenient, to do so for data items.Forward jump to instruction items cannot be easily eliminated.

Answer 2

A single pass assembler investigates the program only once and generates the comparable binary program. The assembler backup all of the symbolic instruction with engine code in one pass.

Advantages:

One-pass assemblers are utilized when

1.    it is important or beneficial to withdraw a second pass over the authorization program.

2.    the outside storage for the standard file among two approaches is slow or is inaccessible to utilize.

Disadvantages:

1.    The central problem is forwarding confirmation to both data and regulations.

Moreover, the forward jump to instruction objects cannot be efficiently eliminated.