Open code

Conditional assembly instructions in open code let you:

Select, during conditional assembly, statements or groups of statements from the open code portion of a source module according to a predetermined set of conditions. The assembler further processes the selected statements at assembly time.
Pass local variable information from open code through parameters into macro definitions.
Control the computation in and generation of macro definitions using global SET symbols.
Substitute values into the model statements in the open code of a source module and control the sequence of their generation.

All the conditional assembly elements and instructions can be specified in open code.

The specifications for the conditional assembly language described in this chapter also apply in open code. However, the following restrictions apply:

To Attributes In Open Code:

For ordinary symbols, only references to the type, length, scale, integer, defined, and operation code attributes are allowed.

References to the number attribute have no meaning in open code, because &SYSLIST is not allowed in open code, and symbolic parameters have no meaning in open code.

To Conditional Assembly Expressions:

Table 1 shows the restrictions for different expression types.

Table 1. Restrictions on coding expressions in open code
Expression	Must not contain
Arithmetic (SETA)	&SYSLIST Symbolic parameters Any attribute references to symbolic parameters, or system variable symbols with local scope
Character (SETC)	System variables with local scope Attribute references to system variables with local scope Symbolic parameters
Logical (SETB)	Arithmetic expressions with the items listed above Character expressions with the items listed above