#!/usr/bin/perl -w
-use Test::More tests => 19;
+use Test::More tests => 30;
use strict;
use Devel::Size qw(size total_size);
-use Scalar::Util qw(weaken);
can_ok ('Devel::Size', qw/
size
/);
die ("Uhoh, test uses an outdated version of Devel::Size")
- unless is ($Devel::Size::VERSION, '0.75_52', 'VERSION MATCHES');
+ unless is ($Devel::Size::VERSION, '0.79_53', 'VERSION MATCHES');
#############################################################################
# some basic checks:
{
my $a = [];
my $b = \$a;
- # making a weakref upgrades the target to PVMG and adds magic
- weaken $b;
+ # Scalar::Util isn't in the core before 5.7.something.
+ # The test isn't really testing anything without the weaken(), but it
+ # isn't counter-productive or harmful to run it anyway.
+ unless (eval {
+ require Scalar::Util;
+ # making a weakref upgrades the target to PVMG and adds magic
+ Scalar::Util::weaken($b);
+ 1;
+ }) {
+ die $@ if $] >= 5.008;
+ }
+
is(total_size($a), total_size([]),
'Any intial reference is dereferenced and discarded');
}
my $before_size = total_size($uurk);
my $before_length = length $uurk;
cmp_ok($before_size, '>', $before_length, 'Size before is sane');
- $uurk =~ s/Perl //;
+ # As of 5.20.0, s/// doesn't trigger COW.
+ # Seems that formline is about the the only thing left that reliably calls
+ # sv_chop. See CPAN #95493, perl #122322
+ formline '^<<<<~', $uurk;
is(total_size($uurk), $before_size,
"Size doesn't change because OOK is used");
cmp_ok(length $uurk, '<', $before_size, 'but string is shorter');
}
+
+sub shared_hash_keys {
+ my %h = @_;
+ my $one = total_size([keys %h]);
+ cmp_ok($one, '>', 0, 'Size of one entry is sane');
+ my $two = total_size([keys %h, keys %h]);
+ cmp_ok($two, '>', $one, 'Two take more space than one');
+ my $increment = $two - $one;
+ is(total_size([keys %h, keys %h, keys %h]), $one + 2 * $increment,
+ 'Linear size increase for three');
+ return $increment;
+}
+
+{
+ my $small = shared_hash_keys(Perl => 'Rules');
+ my $big = shared_hash_keys('x' x 1024, '');
+ SKIP: {
+ skip("[keys %h] doesn't copy as shared hash key scalars prior to 5.10.0",
+ 1) if $] < 5.010;
+ is ($small, $big, 'The "shared" part of shared hash keys is spotted');
+ }
+}
+
+{
+ use vars '%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG';
+ my $hash_size = total_size(\%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG);
+ cmp_ok($hash_size, '>', 0, 'Hash size is sane');
+ my $stash_size
+ = total_size(\%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG::);
+ cmp_ok($stash_size, '>',
+ $hash_size + length 'DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG',
+ 'Stash size is larger than hash size plus length of the name');
+}
+
+{
+ my %h = (Perl => 'Rules');
+ my $hash_size = total_size(\%h);
+ cmp_ok($hash_size, '>', 0, 'Hash size is sane');
+ my $a = keys %h;
+ if ($] < 5.010) {
+ is(total_size(\%h), $hash_size,
+ "Creating iteration state doesn't need to allocate storage");
+ # because all hashes carry the overhead of this storage from creation
+ } else {
+ cmp_ok(total_size(\%h), '>', $hash_size,
+ 'Creating iteration state allocates storage');
+ }
+}