Language Processors
The macro processor must perform

save the macro definitions
expand macro calls and substitute arguments
All of these
recognize macro definitions and macro calls

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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 elements and creation of uniform symbols
recognition of basic syntactic constructs through reductions
use of macro processor to produce more optimal assembly code
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 accepts a program written in a high level language and produces an object program
a program that automate the translation of assembly language into machine language

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Language Processors
A base register table

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
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

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