HLASM Language Reference

Prototype Statement
MEND Statement
Use the MEND statement to indicate the end of a macro definition. It also provides
an exit when it is processed during macro expansion. It can appear only once
within a macro definition and must be the last statement in every macro definition.
►►──┬─────────────────┬──MEND──────────────────────────────────────►◄
└─sequence_symbol─┘
sequence_symbol
is a sequence symbol.
See “MEXIT Instruction” on page 260 for details on exiting from a macro before the
MEND statement.
Macro Instruction Prototype
The macro instruction prototype statement (hereafter called the prototype
statement) specifies the mnemonic operation code and the format of all macro
instructions that you use to call the macro definition.
The prototype statement must be the second non-comment statement in every
macro definition. Both ordinary comment statements and internal comment
statements are allowed between the macro definition header and the macro
prototype. Such comment statements are listed only with the macro definition.
►►──┬────────────┬──operation_field──┬────────────────────────┬────►◄
└─name_field─┘
│ ┌─,──────────────────┐
│
└── ▼ ─symbolic_parameter─┴─┘
name_field
is a variable symbol.
You can write a name field parameter, similar to the symbolic parameter, as the
name entry of a macro prototype statement. You can then assign a value to
this parameter from the name entry in the calling macro instruction.
If this parameter also appears in the body of a macro, it is given the value
assigned to the parameter in the name field of the corresponding macro
instruction.
operation_field
is an ordinary symbol.
The symbol in the operation field of the prototype statement establishes the
name by which a macro definition must be called. This name becomes the
operation code required in any macro instruction that calls the macro.
Any operation code can be specified in the prototype operation field. If the
entry is the same as an assembler or a machine operation code, the new
definition overrides the previous use of the symbol. The same is true if the
specified operation code has been defined earlier in the program as a macro,
or is the operation code of a library macro.
Chapter 7. How to Specify Macro Definitions 245