Print debugging statement: Difference between revisions

Print debugging is similar to C. The _debug_ keyword conditionally compiles

code (ie the debug code isn't compiled unless debugging is turned on).

<lang zkl>fcn ds(line=__LINE__){

println("This is line %d of file %s compiled on %s"

.fmt(line,__FILE__,__DATE__));

}();

_debug_{

ds(__LINE__); println("Debug level is ",__DEBUG__);

vm.stackTrace().println();

}</lang>

Run with debugging turned off:

$ zkl rs

This is line 39 of file rs.zkl compiled on 2019-08-28

Run with debugging turned on:

Due to some brain deadness, we need to set the debug level (-d), compile the

file (-c) then run it and quit out of the REPL:

$ zkl -dc rs --run --quit

Compiled Class(rs) (0.0 seconds, ??? lines/sec)

This is line 44 of file rs.zkl compiled on 2019-08-28

This is line 49 of file rs.zkl compiled on 2019-08-28

Debug level is 1

Stack trace for VM#1 ():

rs.__constructor@stackTrace addr:25 args(0) reg(0)

startup.__constructor@__constructor addr:1767 args(0) reg(22) R