Scroll to navigation

Devel::StackTrace::WithLexicals(3pm) User Contributed Perl Documentation Devel::StackTrace::WithLexicals(3pm)

NAME

Devel::StackTrace::WithLexicals - Devel::StackTrace + PadWalker

SYNOPSIS

    use Devel::StackTrace::WithLexicals;

    sub process_user {
        my $item_count = 20;
        price_items();
        print "$item_count\n";    # prints 21
    }

    sub price_items {
        my $trace = Devel::StackTrace::WithLexicals->new(
            unsafe_ref_capture => 1    # warning: can cause memory leak
        );
        while ( my $frame = $trace->next_frame() ) {
            my $item_count_ref = $frame->lexical('$item_count');
            ${$item_count_ref}++ if ref $item_count_ref eq 'SCALAR';
        }
    }

    process_user();

DESCRIPTION

Devel::StackTrace is pretty good at generating stack traces.

PadWalker is pretty good at the inspection and modification of your callers' lexical variables.

Devel::StackTrace::WithLexicals is pretty good at generating stack traces with all your callers' lexical variables.

METHODS

All the same as Devel::StackTrace, except that frames (in class Devel::StackTrace::WithLexicals::Frame) also have a "lexicals" method. This returns the same hashref as returned by PadWalker.

Unless the "unsafe_ref_capture" option to Devel::StackTrace is used, then each reference is stringified. This can be useful to avoid leaking memory.

Simple, really.

AUTHOR

Shawn M Moore, "sartak@gmail.com"

BUGS

I had to copy and paste some code from Devel::StackTrace to achieve this (it's hard to subclass). There may be bugs lingering here.

COPYRIGHT AND LICENSE

Copyright 2008-2009 Shawn M Moore.

Some portions written by Dave Rolsky, they belong to him.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2017-08-01 perl v5.26.0