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AARM User's Guide
AARM Introduction Assembling Programs Operators Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting A Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator % Operator ;; Operator ! Operator C Preprocessor Exceptions Side-Effects Predefined Macros Examples Error MessagesC Preprocessor
The AARM Assembler includes a standard C preprocessor that is identical with the macro preprocessor in the CARM Compiler (with a few minor exceptions).
The C preprocessor processes the source text of a source file before it is actually assembled. When the C preprocessor is enabled, C preprocessing is the first thing the assembler does. The purpose of the preprocessor is to replace or insert additional text into the source file just prior to assembly.
Most of the obvious functions of the preprocessor require activation (by including preprocessor directives) in your source code. However, there are several things the preprocessor always does:
- Each C comment is replaced by a single space.
- Line continuations (indicated by a backslash ('\') at the end of a line) are removed and the lines they break apart are joined for assembly.
- Predefined macro names are replaced with their predefined text.
In addition to these operations, the C preprocessor supports the more obvious preprocessor operations:
- Header Files,
- Macros,
- Conditional Compilation.
Refer to the Preprocessor in the CARM Compiler User's Guide for more information about the preprocessor directives that are available.
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