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

Shell script, shell script for addnames that has to be called as class list...

shell script for addnames that has to be called as class list in the name of the class list file and username is a particular student''s username

Isoquants, what are the types of isoquants

what are the types of isoquants

How non- textual information is contained in a web page, How non- textual i...

How non- textual information is contained in a web page? Non-textual information as digitized photo and a graphics image is not inserted directly into a HTML document. In place

Finest way to get a reference to the viewport, What is finest way to get a ...

What is finest way to get a reference to the viewport from anywhere in the code? Ans) You can use refs config to set a reference on the Application/Controllers

What is programming paradigm, a. Explain the Programming Paradigm? Discuss ...

a. Explain the Programming Paradigm? Discuss four major programming paradigms. b. State the three basic logic operators available in C++? Write a small program in C++ that uses

Explain characteristics of program translation model, Explain characteristi...

Explain characteristics of program translation model. The program translation model characteristics are: A program should be translated before this can be executed.

Explain what are user controls, Briefly explain what user controls are and ...

Briefly explain what user controls are and what server controls are and the differences between the two.   An ASP.NET control (sometimes known as a server control) is a server-

Give example of bus and memory transfer, Give example of bus and memory tra...

Give example of bus and memory transfer For example, the read operation for transfer of a memory unit M from address register AR to another data register DR can be illustrated

Proof by contradiction - artificial intelligence, Proof by Contradiction - ...

Proof by Contradiction - Artificial intelligence So, both backward chaining andforward chaining have drawbacks. Another approach is to think regarding proving theorems by contr

Explain circuit switching versus packet switching, Explain difference of Ci...

Explain difference of Circuit switching versus Packet switching. Within circuit switching an end-to-end path is to be establishing before any data can be sent. Previously a con

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