Language Processors
A loader is

is a program that appears to execute a source program as if it were machine language
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
a program that places programs into memory and prepares them for execution

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Language Processors
A self-relocating program is one which

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
All of these
can itself perform the relocation of its address-sensitive portions
consists of a program and relevant information for its relocation

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

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