hash.t

#!./perl -w

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require './test.pl';
}

use strict;

plan tests => 10;

# This will crash perl if it fails

use constant PVBM => 'foo';

my $dummy = index 'foo', PVBM;
eval { my %h = (a => PVBM); 1 };

ok (!$@, 'fbm scalar can be inserted into a hash');


my $destroyed;
{ package Class; DESTROY { ++$destroyed; } }

$destroyed = 0;
{
    my %h;
    keys(%h) = 1;
    $h{key} = bless({}, 'Class');
}
is($destroyed, 1, 'Timely hash destruction with lvalue keys');


# [perl #79178] Hash keys must not be stringified during compilation
# Run perl -MO=Concise -e '$a{\"foo"}' on a non-threaded pre-5.13.8 version
# to see why.
{
    my $key;
    package bar;
    sub TIEHASH { bless {}, $_[0] }
    sub FETCH { $key = $_[1] }
    package main;
    tie my %h, "bar";
    () = $h{\'foo'};
    is ref $key, SCALAR =>
     'hash keys are not stringified during compilation';
}

# Part of RT #85026: Deleting the current iterator in void context does not
# free it.
{
    my $gone;
    no warnings 'once';
    local *::DESTROY = sub { ++$gone };
    my %a=(a=>bless[]);
    each %a;   # make the entry with the obj the current iterator
    delete $a{a};
    ok $gone, 'deleting the current iterator in void context frees the val'
}

# [perl #99660] Deleted hash element visible to destructor
{
    my %h;
    $h{k} = bless [];
    my $normal_exit;
    local *::DESTROY = sub { my $x = $h{k}; ++$normal_exit };
    delete $h{k}; # must be in void context to trigger the bug
    ok $normal_exit, 'freed hash elems are not visible to DESTROY';
}

# [perl #100340] Similar bug: freeing a hash elem during a delete
sub guard::DESTROY {
   ${$_[0]}->();
};
*guard = sub (&) {
   my $callback = shift;
   return bless \$callback, "guard"
};
{
  my $ok;
  my %t; %t = (
    stash => {
        guard => guard(sub{
            $ok++;
            delete $t{stash};
        }),
        foo => "bar",
        bar => "baz",
    },
  );
  ok eval { delete $t{stash}{guard}; # must be in void context
            1 },
    'freeing a hash elem from destructor called by delete does not die';
  diag $@ if $@; # panic: free from wrong pool
  is $ok, 1, 'the destructor was called';
}

# Weak references to pad hashes
SKIP: {
    skip_if_miniperl("No Scalar::Util::weaken under miniperl", 1);
    my $ref;
    require Scalar::Util;
    {
        my %hash;
        Scalar::Util::weaken($ref = \%hash);
        1;  # the previous statement must not be the last
    }
    is $ref, undef, 'weak refs to pad hashes go stale on scope exit';
}

# [perl #107440]
sub A::DESTROY { $::ra = 0 }
$::ra = {a=>bless [], 'A'};
undef %$::ra;
pass 'no crash when freeing hash that is being undeffed';
$::ra = {a=>bless [], 'A'};
%$::ra = ('a'..'z');
pass 'no crash when freeing hash that is being exonerated, ahem, cleared';