in reply to Debugger: I must be missing something

Setting breakpoints in other files
f file2 # switch to viewing other file2
b 100 # set a breakpoint at file2:100
r # go!

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To delete a breakpoint in another file, use f to switch to viewing the source, and then run B 100 to remove it. Yes, it would be nice to be able to say B file2:100, but I have it on good authority that patching the debugger will drive you insane.

One key history

You must be missing a module. Term::ReadLine::Perl or something. Otherwise you would already have it.

• another intruder with the mooring in the heart of the Perl

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Re^2: Debugger: I must be missing something
by pemungkah (Priest) on Dec 09, 2006 at 23:38 UTC
    An easy way to find the file that whatever::function is in: use %INC. This maps package names to file names. 
    $ perl -de0

Loading DB routines from perl5db.pl version 1.28
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(-e:1):   0
DB<1> x %INC
0  'warnings/register.pm'
1  '/usr/local/lib/perl5/5.8.8/warnings/register.pm'
2  'attributes.pm'
3  '/usr/local/lib/perl5/5.8.8/attributes.pm'
4  'XSLoader.pm'
5  '/usr/local/lib/perl5/5.8.8/darwin-2level/XSLoader.pm'
6  'IO/Handle.pm'
7  '/usr/local/lib/perl5/5.8.8/darwin-2level/IO/Handle.pm'
8  'Term/Cap.pm'
9  '/usr/local/lib/perl5/5.8.8/Term/Cap.pm'
10  'SelectSaver.pm'
11  '/usr/local/lib/perl5/5.8.8/SelectSaver.pm'
12  'Term/ReadLine/Perl.pm'
13  '/usr/local/lib/perl5/site_perl/5.8.8/Term/ReadLine/Perl.pm'
14  'warnings.pm'
15  '/usr/local/lib/perl5/5.8.8/warnings.pm'
16  'Carp/Heavy.pm'
17  '/usr/local/lib/perl5/5.8.8/Carp/Heavy.pm'
18  'Config.pm'
19  '/usr/local/lib/perl5/5.8.8/darwin-2level/Config.pm'
20  'Symbol.pm'
21  '/usr/local/lib/perl5/5.8.8/Symbol.pm'
22  'IO.pm'
23  '/usr/local/lib/perl5/5.8.8/darwin-2level/IO.pm'
24  'Carp.pm'
25  '/usr/local/lib/perl5/5.8.8/Carp.pm'
26  'Term/ReadLine.pm'
27  '/usr/local/lib/perl5/5.8.8/Term/ReadLine.pm'
28  'vars.pm'
29  '/usr/local/lib/perl5/5.8.8/vars.pm'
30  'strict.pm'
31  '/usr/local/lib/perl5/5.8.8/strict.pm'
32  'Exporter.pm'
33  '/usr/local/lib/perl5/5.8.8/Exporter.pm'
34  'Config_heavy.pl'
35  '/usr/local/lib/perl5/5.8.8/darwin-2level/Config_heavy.pl'
36  'Term/ReadLine/readline.pm'
37  '/usr/local/lib/perl5/site_perl/5.8.8/Term/ReadLine/readline.pm'
38  'Term/ReadKey.pm'
39  '/usr/local/lib/perl5/site_perl/5.8.8/darwin-2level/Term/ReadKey.p
+m'
40  'AutoLoader.pm'
41  '/usr/local/lib/perl5/5.8.8/AutoLoader.pm'
42  'perl5db.pl'
43  '/usr/local/lib/perl5/5.8.8/perl5db.pl'
44  'DynaLoader.pm'
45  '/usr/local/lib/perl5/5.8.8/darwin-2level/DynaLoader.pm'
46  'SelfLoader.pm'
47  '/usr/local/lib/perl5/5.8.8/SelfLoader.pm'

DB<2>

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    Notice that the keys are module names (with slashes instead of double-colons) and the values are filenames. You can then use the debugger's f command to switch files. After that, all of the code navigation commands work fine in the new file. Do a '.' to get back to where you were previously.

    Edit: Devel::Command::NewF extends the f command to automatically look up the module in %INC, translating the name for you from Whatever::It::Is to Whatever/It/Is.pm, and loading the module if it isn't found. 

    $ perl -de0
Patching with Devel::Command::DBSub::DB_5_8_5

Loading DB routines from perl5db.pl version 1.27
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(-e:1):    0
  DB<1> fx Test::More
Loaded Test::More
auto(-1)  DB<2> f /home/y/lib/perl5/5.8/i386-freebsd-thread-multi/Test
+/More.pm
1     package Test::More;
2     
3:    use 5.004;
4     
5:    use strict;
6     
7     
8     # Can't use Carp because it might cause use_ok() to accidentally
+ succeed9     # even though the module being used forgot to use Carp.
+  Yes, this
10     # actually happened.
  DB<3>

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