Language Processors
A base register table

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

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Language Processors
A non-relocatable program is one which

All of these
consists of a program and relevant information for its relocation
can itself perform the relocation of its address-sensitive portions
cannot be made to execute in any area of storage other than the one designated for it at the time of its coding or translation

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

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

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