HLASM Language Reference

MACRO and MEND Statements
The assembler does not process the macro definition for INNER until OUTER is called
with a value for &C other than a null string.
Open Code: Open code is that part of a source module that lies outside of any
source macro definition. At coding time, it is important to distinguish between
source statements that lie in open code, and those that lie inside macro definitions.
Format of a Macro Definition
The general format of a macro definition is shown in Figure 63. The four parts are
described in detail in the following sections.
┌─────────────────────────────────────────────────┐
│ ┌───────────────────────────────────────────┐ │
│ │ MACRO Header statement │ │
│ └───────────────────────────────────────────┘ │
│ ┌───────────────────────────────────────────┐ │
│ │ ANYNAME Prototype statement│ │
│ └───────────────────────────────────────────┘ │
│ ┌───────────────────────────────────────────┐ │
│ │
│ │
│ │ Body of macro │ │
│ │
│ │
│ └───────────────────────────────────────────┘ │
│ ┌───────────────────────────────────────────┐ │
│ │ MEND Trailer statement │ │
│ └───────────────────────────────────────────┘ │
└─────────────────────────────────────────────────┘
Figure 63. Format of a Macro Definition
Macro Definition Header and Trailer
You must establish the boundaries of a macro definition by coding:
A macro definition header statement as the first statement of the macro
definition (a MACRO statement)
A macro definition trailer statement as the last statement of the macro definition
(a MEND statement)
The instructions used to define the boundaries of a macro instruction are described
in the following sections.
MACRO Statement
Use the MACRO statement to indicate the beginning of a macro definition. It must
be the first non-comment statement in every macro definition. Library macro
definitions may have ordinary or internal macro comments before the MACRO
statement.
►►──MACRO──────────────────────────────────────────────────────────►◄
The MACRO statement must not have a name entry or an operand entry.
244 HLASM V1R5 Language Reference