4 use Test::More tests => 18;
5 use Devel::Size ':all';
7 # For me, for some files locally, I'm seeing failures
8 # Failed test '&two_lex is bigger than an empty sub by less than 2048 bytes'
9 # Just for some perl versions (5.8.7, 5.10.1, some 5.12.*)
10 # As ever, the reason is subtle and annoying. As this test is running in package
11 # main, loading modules at runtime might create entries in %::
12 # In this case, it's just one key, '_</.../lib/perl5/5.12.4/overload.pm'
13 # because Test::More is demand loading overload at the first test.
14 # So the first fix I tried was to "encourage" Test::More to get all this done
15 # before we start doing things that are sensitive to the size of %::
18 # cmp_ok(1, '==', 1, "prompt Test::More to load everything it needs *now*");
20 # which fixed most things, but not 5.8.7, which (*only under make test*) would
21 # fail '&two_lex is bigger than an empty sub by less than 2048 bytes'
22 # Turns out that Test::More 0.54 creates an entry in %:: for every test run
23 # (not sure why, side effect of an eval with a #line directive, maybe?)
24 # The solution is to measure (and re-measure) the size of things you're
25 # comparing as contiguous statements, assigning to variables, and then make
26 # calls to Test::More functions.
29 sub swoosh($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$);
33 my $whack_size = total_size(\&whack);
34 my $zwapp_size = total_size(\&zwapp);
35 my $swoosh_size = total_size(\&swoosh);
36 my $crunch_size = total_size(\&crunch);
38 cmp_ok($whack_size, '>', 0, 'CV generated at runtime has a size');
40 cmp_ok($zwapp_size, '==', $whack_size,
41 'CV stubbed at compiletime is the same size');
43 cmp_ok($zwapp_size, '>', $whack_size,
44 'CV stubbed at compiletime is larger (CvOUTSIDE is set and followed)');
46 cmp_ok(length prototype \&swoosh, '>', 0, 'prototype has a length');
47 cmp_ok($swoosh_size, '>', $zwapp_size + length prototype \&swoosh,
48 'prototypes add to the size');
49 cmp_ok($crunch_size, '>', $zwapp_size, 'sub bodies add to the size');
51 my $anon_proto = sub ($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$) {};
52 my $anon_size = total_size(sub {});
53 my $anon_proto_size = total_size($anon_proto);
54 cmp_ok($anon_size, '>', 0, 'anonymous subroutines have a size');
55 cmp_ok(length prototype $anon_proto, '>', 0, 'prototype has a length');
56 cmp_ok($anon_proto_size, '>', $anon_size + length prototype $anon_proto,
57 'prototypes add to the size');
61 my $aelemfast_lex = total_size(sub {my @a; $a[0]});
62 my $aelemfast = total_size(sub {my @a; $b[0]});
64 # This one is sane even before Dave's lexical aelemfast changes:
65 cmp_ok($aelemfast_lex, '>', $anon_size,
66 'aelemfast for a lexical is handled correctly');
67 skip('alemfast was extended to lexicals after this perl was released', 1)
69 cmp_ok($aelemfast, '>', $aelemfast_lex,
70 'aelemfast for a package variable is larger');
73 my $short_pvop = total_size(sub {goto GLIT});
74 my $long_pvop = total_size(sub {goto KREEK_KREEK_CLANK_CLANK});
75 cmp_ok($short_pvop, '>', $anon_size, 'OPc_PVOP can be measured');
76 is($long_pvop, $short_pvop + 19, 'the only size difference is the label length');
85 my $before_size = total_size(\&bloop);
87 my $after_size = total_size(\&bloop);
89 cmp_ok($after_size, '>', $before_size, 'Recursion increases the PADLIST');
91 sub closure_with_eval {
93 return sub { eval ""; $a };
96 sub closure_without_eval {
98 return sub { require ""; $a };
102 # Again relying too much on the core's implementation, but while that holds,
103 # this does test that CvOUTSIDE() is being followed.
104 cmp_ok(total_size(closure_with_eval()), '>',
105 total_size(closure_without_eval()) + 256,
106 'CvOUTSIDE is now NULL on cloned closures, unless they have eval');
108 # Seems that they differ by a few bytes on 5.8.x
109 cmp_ok(total_size(closure_with_eval()), '<=',
110 total_size(closure_without_eval()) + 256,
111 "CvOUTSIDE is set on all cloned closures, so these won't differ by much");
120 my $We_are_the_music_makers_And_we_are_the_dreamers_of_dreams_Wandering_by_lone_sea_breakers_And_sitting_by_desolate_streams_World_losers_and_world_forsakers_On_whom_the_pale_moon_gleams_Yet_we_are_the_movers_and_shakers_Of_the_world_for_ever_it_seems;
121 my $With_wonderful_deathless_ditties_We_build_up_the_world_s_great_cities_And_out_of_a_fabulous_story_We_fashion_an_empire_s_glory_One_man_with_a_dream_at_pleasure_Shall_go_forth_and_conquer_a_crown_And_three_with_a_new_song_s_measure;
122 # /Ode/, Arthur O'Shaughnessy, published in 1873.
123 # Sadly all but one of the remaining versus are too long for an identifier.
126 # Aargh, re-measure it. See comment at the top of the file.
127 $crunch_size = total_size(\&crunch);
128 my $two_lex_size = total_size(\&two_lex);
129 cmp_ok($two_lex_size, '>', $crunch_size,
130 '&two_lex is bigger than an empty sub');
131 cmp_ok($two_lex_size, '<', $crunch_size + 2048,
132 '&two_lex is bigger than an empty sub by less than 2048 bytes');
134 my $ode_size = total_size(\&ode);
136 # Fixing this for pre-v5.18 involves solving the more general problem of
137 # when to "recurse" into nested structures, currently bodged with
138 # "SOME_RECURSION" and friends. :-(
140 'Devel::Size has never handled the size of names in the pad correctly'
142 cmp_ok($ode_size, '>', $two_lex_size + 384,
143 '&ode is bigger than a sub with two lexicals by least 384 bytes');
146 cmp_ok($ode_size, '<', $two_lex_size + 768,
147 '&ode is bigger than a sub with two lexicals by less than 768 bytes');