REXX Assembler

Comments

/* Block Comment */

* Line Comment

Globals

File Registers

.globals={int}

Defines {int} global variable g0 … gn. These can be used within any procedure in the file.

Global Registers

Any global register marked as exposed is available to any file which also has the corresponding exposed index/name.

File 1

.globals=2            * 2 Global Registers
g0 .expose=namespace.var_name   * 

File 2

.globals=3            * 3 Global Registers
g2 .expose=namespace.var_name   * 

In this case file 1 g0 is mapped to file 2 g2 under the index/name of “namespace.var_name”.

Global Procedures

File 1

* The ".locals" shows the procedure is defined in here
proc() .locals=3 .expose=namespace.proc
ret

File 2

* No ".locals" here! Showing that the procedure is only being declared 
rproc() .expose=namespace.proc

main() .locals=3 
call rproc
ret

In this case main() in File 2, calls rproc() which is globally provided under the index/name of “namespace.proc”. In File 1, proc() is exposed under this name and hence called from File 1.

Note: that “namespace” hints at the use of namespaces as part of exposed names. Also, as shown names can be mapped - they don’t have to be the same in the source and in the target.