OPS/REXX Built-in Functions › OPSVALUE Function › Debugging Guidelines

Debugging Guidelines

Incorporate a ‘SIGNAL on SYNTAX’ routine within the rule or program to obtain and display any error messages that are returned during a function call failure. Additionally, use a ‘TRACE I’ REXX statement when it is needed before the function call to obtain the logical trace activity within the invoking rule or program. The debugging code has a format similar to the following example:

/*--------------------------------------------------------------------*
/* Create Signal on Syntax routine to obtain any failure messages.    *
/*--+----1----+----2----+----3----+----4----+----5----+----6----+----7*
signal on syntax                                                       
/*--------------------------------------------------------------------*
/* Add TRACE I if needed to trace logic flow of rule/program.         *
/*--+----1----+----2----+----3----+----4----+----5----+----6----+----7*
trace I
varname = 'GLVPLXT0.VARTEST.1'
varval  = 'TEST NUMBER 1'
setvar  = OPSVASRV("CREATE NAME("varname") DATAVAL('"varval"')")
return
syntax:
 do queued()
   pull err_info 
   say 'Failure info from OPSVASRV='err_info
 end