Self made

Macro Processors
Chapter 4
System Software
An introduction to systems programming
Leland L. Beck




1

, Introduction

 Concept
» A macro instruction is a notational convenience for the
programmer
» It allows the programmer to write shorthand version of a
program (module programming)
» The macro processor replaces each macro invocation with
the corresponding sequence of statements (expanding)




2

, Macro Processor

 Recognize macro definitions
 Save the macro definition
 Recognize macro calls
 Expand macro calls



Source
Macro Expanded Compiler or obj
Code
(with macro)
Processor Code Assembler



3

, Macro Definition

 copy code
 parameter substitution
 conditional macro expansion
 macro instruction defining macros




4