Language Processors
Assembly code data base is associated with

a permanent table which lists all key words and special symbols of the language in symbolic form
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
assembly language version of the program which is created by the code generation phase and is input to the assembly phase
consists of a full or partial list or the tokens as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation

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Language Processors
In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with

use of macro processor to produce more optimal assembly code
recognition of basic elements and creation of uniform symbols
recognition of basic syntactic constructs through reductions
creation of more optional matrix

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Language Processors
Assembler is

a program that places programs into memory and prepares them for execution
is a program that appears to execute a source program as if it were machine language
a program that automate the translation of assembly language into machine language
a program that accepts a program written in a high level language and produces an object program

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