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.

Posted Date: 5/4/2012 4:17:36 AM | Location : United States

Ask an Expert

Related Discussions:- describe symbols chart in assembly process ?, Assignment Help, Ask Question on describe symbols chart in assembly process ?, Get Answer, Expert's Help, describe symbols chart in assembly process ? Discussions

Write discussion on describe symbols chart in assembly process ?
Your posts are moderated

Write your message here..

Related Questions

Assembly Language Project, Our instructor gave us a project in making a mec... Our instructor gave us a project in making a mechanical game or simple device using assembly language, can anyone give me a an example of a project description for our proposal?

Data base, advantages of file base system advantages of file base system

RMO CSMS marketing subsystem, I need to write a narrative n overview of the... I need to write a narrative n overview of the diagram and an analysis of the actors

Syntax of a Procedure in assembly language, There are two kinds of procedur... There are two kinds of procedures, the intrasegments, which are found on the similar segment of instructions and the inter-segments which can be stored on dissimilar memory segment

Quantitative Methods in Business Decision Making, 4. Union City Al has dec... 4. Union City Al has decided to upgrade their tornado warning system. The city leaders have identified six potential locations for erecting a warning siren tower. They want to e

Batch processing, Batch Processing When the entire computer system is d... Batch Processing When the entire computer system is dedicated to a single job, the system is said to be operating in Batch Processing mode. In this mode each program is run to

C, wap to print padovan string in c wap to print padovan string in c

Discuss the attributes of speech codec, Question 1 What is mobile telephon... Question 1 What is mobile telephone initialization? Explain the three main goals of this procedure Define GSM system operations Introduction to mobile telephone initializ

General considerations for search - artificial intelligence, General Consid... General Considerations for Search If we may specify the starting state, the operators and the goal check for a search problem, then we know from where to start, how to move and

Database reports, The first report, Report #1, is to be an ordered list of ... The first report, Report #1, is to be an ordered list of the contents of the database, sorted in ascending order by a major field. Report #1 is to include all of the fields and rec