Language Processors
The system/370 assembler language

allows the programmer to write base registers and displacements explicitly in the source program
is a term that refers to the control programs of an operating system
is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain
allows multiple programs to reside in separate areas of core at the same time

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Language Processors
Terminal Table

a permanent table which lists all key words and special symbols of the language in symbolic form
contains all constants in the program
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
consists of a full or partial list of 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 "Machine independent optimization" is associated with

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

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