Inspecting package vars in a sub

LanX has asked for the wisdom of the Perl Monks concerning the following question:

PadWalker has a handy function peek_sub() to identify all private vars in a sub, but lacks a method to do so with package vars.

  DB<318> $code = sub { my $a ** $b ** $bla::c }

  DB<319> x peek_sub($code)
0  HASH(0x3d161a8)
   '$a' => SCALAR(0x3d18da0)
      -> undef
  DB<320>
[download]

What's the best way to achieve this, except parsing the text output of B::Concise for GVs? (is this even reliable?) °

I think I asked this before, but who knows what changed in the meantime :)

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

UPDATE

°) #<-- comments added

D:\>perl -MO=Concise,bla -e "sub bla {@a = ($b, my $c)}"
main::bla:
9  <1> leavesub[1 ref] K/REFC,1 ->(end)
-     <@> lineseq KP ->9
1        <;> nextstate(main 2 -e:1) v ->2
8        <2> aassign[t5] KS/COM_AGG ->9
-           <1> ex-list lKP ->5
2              <0> pushmark s ->3
-              <1> ex-rv2sv sK/1 ->4
3                 <#> gvsv[*b] s ->4                  #<-- $::b
4              <0> padsv[$c:2,3] sM/LVINTRO ->5       #<-- my $c
-           <1> ex-list lK ->8
5              <0> pushmark s ->6
7              <1> rv2av[t2] lKRM*/1 ->8
6                 <#> gv[*a] s ->7                    #<-- @::a
-e syntax OK
[download]

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Re: Inspecting package vars in a sub by choroba (Cardinal) on Dec 04, 2020 at 22:18 UTC
Why do you need it? I'm just curious. Also, I probably asked this before, but who knows what changed in the meantime :-) `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re^2: Inspecting package vars in a sub by LanX (Saint) on Dec 04, 2020 at 22:40 UTC
Long story, ... you know meta-programming and syntactic sugar stuff. ;) For instance I want to be able to automatically localize special package vars in a code-block `sub xsub (&) { my ($code)=@_; sub { local ($a,$b) = @_; &$code; } } my $c_ref = xsub { $a $b }; say $c_ref->(2,3); #> 8` [download] This looks better than `sub { $_[0] $_[1] }` Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]