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(nasm.info)Chapter 4

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Chapter 4: The NASM Preprocessor
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   NASM contains a powerful macro processor, which supports conditional
assembly, multi-level file inclusion, two forms of macro (single-line
and multi-line), and a `context stack' mechanism for extra macro power.
Preprocessor directives all begin with a `%' sign.

   The preprocessor collapses all lines which end with a backslash (\)
character into a single line. Thus:

     %define THIS_VERY_LONG_MACRO_NAME_IS_DEFINED_TO \
             THIS_VALUE

   will work like a single-line macro without the backslash-newline
sequence.

Section 4.1

Single-Line Macros

Section 4.2

String Handling in Macros: `%strlen' and `%substr'

Section 4.3

Multi-Line Macros: `%macro'

Section 4.4

Conditional Assembly

Section 4.5

Preprocessor Loops: `%rep'

Section 4.6

Including Other Files

Section 4.7

The Context Stack

Section 4.8

Standard Macros

Section 4.9

TASM Compatible Preprocessor Directives

Section 4.10

Other Preprocessor Directives