Trace ;line by line execution of Perl6 program or module using Perl6::Tracer module
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Latest commit 9ca68a1 Nov 11, 2016 @jaffa4 committed on GitHub Merge pull request #8 from zoffixznet/patch-1
Add mandatory "perl" META field


Trace Perl6 code.

Known limitations: if there is a BEGIN, there will not be any formatting. Also, if classes are imported from nqp.


use Rakudo::Perl6::Tracer;

my $f =; # create a new object
say $f.trace({},$content); #  trace the content

The returned program code will contain tracing statements beside the original code.

If you run the traced code, you will see what lines were executed.

Command line access

$ perl6 trace.p6 -h

$ perl6 trace.p6  <Dagrammar.p6 >traced.p6
$ perl6 trace.p6 -sl  <Dagrammar.p6 >traced.p6


Example of traced code, note statements are inserted by trace.p6:

sub dump_node($node)
 note "line  19";say "matched";
 note "line  20";if ($node<regliteral>) {
 note "line  21";say "reg $node"~$node<regliteral>;
 note "line  22";}
note "line  23";}

OR example trace log with -sl

line  1 my @Depindex;
line  2 my @Depthis;
line  3 my @Depon;
line  4 my @Depend;
line  5 my @Bot;
line  7 my $debug = False;
line  215 my %h;
line  216 my %g;
line  217 %h<itemid> = 1;
line  218 %g<itemid> = 2;
line  219 %h<name>   = '1';
line  220 %g<name>   = '2';
line  222 my %j  = ( "itemid", 3, "name", 3 );
line  223 my %j4 = ( "itemid", 4, "name", 4 );