describe symbols chart in assembly process ?, Basic Computer Science

Assignment Help:
SYMBOLS CHART
Every one of the parts on code line in assembler is known as token, for instance on the code line:
MOV AX, Var
We comprise three tokens, the MOV instruction, the AX operator, and the VAR operator. What the assembler does to produce the OBJ code is to read each one of the tokens and appear for it on an internal "equivalence" chart identified as the reserved words chart, which is where all the mnemonic meanings we use as instructions are establish.
Follow this process, the assembler reads MOV, seems for it on its chart and recognizes it as a processor instruction. similarly it reads AX and identifies it as a register of the processor, but when it seems for the Var token on the reserved words chart, it does not get it, so then it seems for it on the symbols chart which is a table where the names of the constants, variables and labels used in the program where their addresses on memory are incorporated and the sort of data it contains, are found.
at times the assembler comes on a token which is not distinct on the program, consequently what it does in these cased is to pass a second time by the source program to confirm all references to that symbol and put it on the symbols chart. There are symbols which the assembler will not find given that they do not belong to that segment and the program does not know in what part of the memory it will get that segment, and at this time the linker comes into action, which will make the structure necessary for the loader so that the segment and the token be distinct when the program is loaded and previous to it is executed.

Related Discussions:- describe symbols chart in assembly process ?

Execution of a machine instruction, Execution of a machine instruction: ...

Execution of a machine instruction: Execution of a machine instruction on modern processors involves a complex sequence of operations with multiple cycles. One instruction cyc

ALP Program to find 10''s complement, I would like to know how to write a p...

I would like to know how to write a program for a 8086 microprocessor in ALP to find 10''s complement of a packed BCD number.

Desk top publishing program, Desk Top Publishing Program: Desktop publ...

Desk Top Publishing Program: Desktop publishing programs contain many of the features of word processing software, but .go even further in the ability to layout the format of

Database, how does one create a database in mysql

how does one create a database in mysql

Development of personnel computer operating system, Development of Personne...

Development of Personnel Computer Operating System: The next important breakthrough in computer use occurred in 1982, with the introduction of the IBM personal computer. The I

Give a preliminary design for the mobile phone, Question: Imagine that ...

Question: Imagine that you are part of a design team creating a new mobile phone for people such as "Angel White" whose persona is given below: Angel is turning 90 years old

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