Language Processors
The macro processor must perform

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

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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
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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