Note for System Programming - SP by Tushar Mehndiratta

Topics ( 7 )

Text from page-1

MACRO AND MACRO PROCESSORS

Text from page-2

Introduction  Macro is a feature provided in pgm language  Macro Definition defines new operation  Macro call in program is invocation of new operation  Leads to prg generation facility through macro expansion.  Macro Expansion – Macro call replaced by sequence of statement

Text from page-3

Cont.  “A macro is a unit of specification for program generation through expansion.  Macro consist of name, a set of formal parameters and a body of code.  “The use of macro name with a set of actual parameters is replaced by some code generated from its body, this is called m acro expansion.”

Text from page-4

Cont.  In Assembly lang, Two ways to handle Macro 1) Macro Assembler 2) Macro Preprocessor  Macro Assembler does expansion of macro calls and also assembles resulting assembly prog.  While Macro Preprocessor merely does expansion and produces assembly prog.