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1 | #!./perl |
2 | |
3 | use strict; |
4 | use warnings; |
5 | BEGIN { |
6 | unless (-d 'blib') { |
7 | chdir 't' if -d 't'; |
8 | @INC = '../lib'; |
9 | } |
10 | } |
11 | |
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12 | require './test.pl'; |
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13 | |
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14 | plan(skip_all => "Your system has no SIGALRM") if !exists $SIG{ALRM}; |
15 | plan(tests => 8); |
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16 | |
17 | =pod |
18 | |
19 | These are like the 010_complex_merge_classless test, |
20 | but an infinite loop has been made in the heirarchy, |
21 | to test that we can fail cleanly instead of going |
22 | into an infinite loop |
23 | |
24 | =cut |
25 | |
26 | # initial setup, everything sane |
27 | { |
28 | package K; |
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29 | use mro 'c3'; |
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30 | our @ISA = qw/J I/; |
31 | package J; |
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32 | use mro 'c3'; |
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33 | our @ISA = qw/F/; |
34 | package I; |
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35 | use mro 'c3'; |
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36 | our @ISA = qw/H F/; |
37 | package H; |
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38 | use mro 'c3'; |
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39 | our @ISA = qw/G/; |
40 | package G; |
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41 | use mro 'c3'; |
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42 | our @ISA = qw/D/; |
43 | package F; |
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44 | use mro 'c3'; |
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45 | our @ISA = qw/E/; |
46 | package E; |
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47 | use mro 'c3'; |
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48 | our @ISA = qw/D/; |
49 | package D; |
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50 | use mro 'c3'; |
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51 | our @ISA = qw/A B C/; |
52 | package C; |
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53 | use mro 'c3'; |
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54 | our @ISA = qw//; |
55 | package B; |
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56 | use mro 'c3'; |
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57 | our @ISA = qw//; |
58 | package A; |
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59 | use mro 'c3'; |
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60 | our @ISA = qw//; |
61 | } |
62 | |
63 | # A series of 8 abberations that would cause infinite loops, |
64 | # each one undoing the work of the previous |
65 | my @loopies = ( |
66 | sub { @E::ISA = qw/F/ }, |
67 | sub { @E::ISA = qw/D/; @C::ISA = qw/F/ }, |
68 | sub { @C::ISA = qw//; @A::ISA = qw/K/ }, |
69 | sub { @A::ISA = qw//; @J::ISA = qw/F K/ }, |
70 | sub { @J::ISA = qw/F/; @H::ISA = qw/K G/ }, |
71 | sub { @H::ISA = qw/G/; @B::ISA = qw/B/ }, |
72 | sub { @B::ISA = qw//; @K::ISA = qw/K J I/ }, |
73 | sub { @K::ISA = qw/J I/; @D::ISA = qw/A H B C/ }, |
74 | ); |
75 | |
76 | foreach my $loopy (@loopies) { |
77 | eval { |
78 | local $SIG{ALRM} = sub { die "ALRMTimeout" }; |
79 | alarm(3); |
80 | $loopy->(); |
81 | mro::get_linear_isa('K', 'c3'); |
82 | }; |
83 | |
84 | if(my $err = $@) { |
85 | if($err =~ /ALRMTimeout/) { |
86 | ok(0, "Loop terminated by SIGALRM"); |
87 | } |
88 | elsif($err =~ /Recursive inheritance detected/) { |
89 | ok(1, "Graceful exception thrown"); |
90 | } |
91 | else { |
92 | ok(0, "Unrecognized exception: $err"); |
93 | } |
94 | } |
95 | else { |
96 | ok(0, "Infinite loop apparently succeeded???"); |
97 | } |
98 | } |