TAL Reference Manual

Compiler Directives
TAL Reference Manual—526371-001
16-3
Directive Stacks
2. This directive line shows proper placement of the leading parenthesis of the
argument list:
?NOLIST, SOURCE $SYSTEM.SYSTEM.EXTDECS (
? PROCESS_GETINFO_,
? PROCESS_STOP_)
Directive Stacks
Several directives have a compile-time directive stack on which you can push and pop
directive settings. Directives that have directive stacks are:
CHECK
CODE
DEFEXPAND
ICODE
INNERLIST
INT32INDEX
LIST
MAP
Each directive stack is 32 levels deep. The compiler initially sets all levels of each
directive stack to the off state.
Pushing Directive Settings
When you push the current directive setting onto a directive stack, the current directive
setting of the source file remains unchanged until you specify a new directive setting.
To push a directive setting onto a directive stack, specify the directive name prefixed by
PUSH. For example, to push the current setting of the LIST directive onto the LIST
directive stack, specify PUSHLIST. The other values in the directive stack move down
one level. If a value is pushed off the bottom of the directive stack, that value is lost.
Popping Directive Settings
To restore the top value from a directive stack as the current setting of the source file,
specify the directive name prefixed by POP. For example, to restore the top value off
the LIST directive stack, specify POPLIST. The remaining values in the directive stack
move up one level, and the vacated level at the bottom of the stack is set to the off
state.