Assembler, Computer Engineering

Assignment Help:

Assembler:

Typically a modern assembler makes object code by translating assembly instruction into op codes, & by resolving symbolic names for memory locations and any other entities. The use of symbolic references is a crucial feature of assemblers, by saving tiring calculations and manual address updates after program modifications. Also most of the assemblers include macro facilities for performing textual substitution- for example, to produce common short sequences of instructions to run inline, rather of in a subroutine.

There are 2 types of assemblers based on how many passes through the source are required to generate the executable program. One-pass assemblers once go through the source code and suppose that all symbols will be defined before any instruction that references them. Two-pass assemblers (and multi-pass assemblers) first create a table with all unresolved symbols in the first pass and then use the 2nd pass to resolve these addresses. The benefit in one-pass assemblers is speed, which is not so much important as it once was with advances in computer speed and capabilities. The benefit of the two-pass assembler is that symbols may be defined anywhere in the program source. As a result, the program may be defined in a more logical and meaningful way. it makes two-pass assembler programs simpler to read and maintain.

Sophisticated high-level assemblers give language abstractions such as:

  •   Advanced control structures
  •   High-level procedure/function invocations and declarations
  •   High-level abstract data types, including, sets ,classes, unions and structures/records
  •   Sophisticated macro processing
  •   Object-Oriented features such as polymorphism ,encapsulation, interfaces inheritance

 


Related Discussions:- Assembler

Defines a macro, Defines a macro Defines a macro with the given name, h...

Defines a macro Defines a macro with the given name, having as its value the given replacement text. After that (for the rest of the current source file), wherever the preproce

Minimax search, Minimax search: Always notice there that the process a...

Minimax search: Always notice there that the process above was in order for player one to choose his and her first move for that. The whole entire process would require to fre

Voice identifier - biometric computer security systems, Voice Identifier - ...

Voice Identifier - Biometric Computer Security Systems Besides fingerprint, another popular security technology is voice identifier. According to VSS organization (2007), voic

Cso, why we don''t use register at the place of ram?

why we don''t use register at the place of ram?

What is normal form, What is normal form? A normal form is a guideline ...

What is normal form? A normal form is a guideline for relational database tables that enhances data consistency. As tables satisfy higher levels of normal forms, they are less

Explain about candidate check, The process which is underlined throughout t...

The process which is underlined throughout the check of base data is called as candidate check. When performing candidate check performance varies either towards the positive side

Performance and issues in pipelining-speedup, Performance and Issues in Pip...

Performance and Issues in Pipelining Speedup:   Firstly, we get the speedup factor that is we see how much speed up performance we get through pipelining. First we get the

Develop a program octal to hexadecimal, Q.  Develop a Menu driven program w...

Q.  Develop a Menu driven program with following menu: 1.  Octal to Decimal 2.  Octal to Hexadecimal 3.  Octal to Binary

Main memory location, Poor Richard's cache as explained in Conference Topic...

Poor Richard's cache as explained in Conference Topic 2. Suppose that a 7th word (gggg gggg) from main memory location 011110 is read and stored in cache. a) Determine the cach

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd