File: leakfinder.pl

package info (click to toggle)
perl 5.24.1-3+deb9u5
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 103,716 kB
  • sloc: perl: 559,611; ansic: 293,886; sh: 67,316; pascal: 7,632; cpp: 3,895; makefile: 2,436; xml: 2,410; yacc: 989; sed: 6; lisp: 1
file content (166 lines) | stat: -rw-r--r-- 6,206 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

# WARNING! This script can be dangerous.  It executes every line in every
# file in the build directory and its subdirectories, so it could do some
# harm if the line contains `rm *` or something similar.
#
# Run this as ./perl -Ilib Porting/leakfinder.pl after building perl.
#
# This is a quick non-portable hack that evaluates pieces of code in an
# eval twice and sees whether the number of SVs goes up.  Any lines that
# leak are printed to STDOUT.
#
# push and unshift will give false positives.  Some lines (listed at the
# bottom) are explicitly skipped.  Some patterns (at the beginning of the
# inner for loop) are also skipped.

use XS::APItest "sv_count";
use Data::Dumper;
$Data::Dumper::Useqq++;
for(`find .`) {
 warn $_;
 chomp;
 for(`cat \Q$_\E 2>/dev/null`) {
    next if exists $exceptions{s/^\s+//r};
    next if /rm -rf/; # Could be an example from perlsec, e.g.
     # Creating one of these special blocks creates SVs, obviously
    next if /(?:END|CHECK|INIT)\s*\{/;
    next if /^[{(]?\s*(?:push|unshift|(?:\@r = )?splice|binmode|sleep)/;
    next if /\bselect(?:\s*|\()[^()]+,/; # 4-arg select hangs
    next if /use parent/;
    my $q = s/[\\']/sprintf "\\%02x", ord $&/gore
         =~ s/\0/'."\\0".'/grid;
    $prog = <<end;   
            open oUt, ">&", STDOUT;
            open STDOUT, ">/dev/null";
            open STDIN, "</dev/null";
            open STDERR, ">/dev/null";
            \$unused_variable = '$q';
            eval \$unused_variable while \$also_unused++ < 4;
            print oUt sv_count, "\n";
            eval \$unused_variable;
            print oUt sv_count, "\n";
end
    open my $fh, "-|", $^X, "-Ilib", "-MXS::APItest=sv_count",
                 '-e', $prog or warn($!), next;
    local $/;
    $out = <$fh>;
    close $fh;
    @_ = split ' ', $out;
    if (@_ == 2 && $_[1] > $_[0]) { print Dumper $_ }
 }
}

BEGIN {
 @exceptions = split /^/, <<'end';
1 while 1;
1 while some_condition_with_side_effects;  */
$a{buttons}[2*$a{default_button}] = [$a{buttons}[2*$a{default_button}]];
$aliases{$code_point} = [ $aliases{$code_point} ];
$aliases_maps->[$i] = [ $aliases_maps->[$i] ]
$allow ? $hash{$acc} = $allow : push @list, $acc;
/(a*(*MARK:a)b?)(*MARK:x)(*SKIP:a)(?{$count++; push @res,$1})(*FAIL)/g;
$^A .= new version ~$_ for "\xce", v205, "\xcc";
A rare race condition that would lead to L<sleep|perlfunc/sleep> taking more
$args{include_dirs} = [ $args{include_dirs} ] 
$ARRAY[++$#ARRAY] = $value;
@a = sort ($b, @a)
$a = {x => $a};
$base =~ /^[cwnv]/i or push @tmpl, "$base>", "$base<";
$base =~ /^[nv]/i or push @formats, "$base>", "$base<";
BEGIN { unshift(@INC, "./blib") }
BEGIN { unshift @INC, "lib" }
BEGIN { unshift(@INC, LIST) }
binmode *STDERR, ":encoding(utf8)";
binmode *STDOUT, ":encoding(utf8)";
char const *file = __FILE__;
$char++ while substr( $got, $char, 1 ) eq substr( $wanted, $char, 1 );
CHECK { $main::phase++ }
$config{$k} = [ $config{$k} ]
const char *file = __FILE__;
const char* file = __FILE__;
$count4 = unshift (@array, 0);
$count7 = unshift (@array, 3, 2, 1);
$data = [ $data ];
do { $tainted_value = shift @ENV_values  } while(!$tainted_value || ref $tainted_value);
do {$x[$x] = $x;} while ($x++) < 10;
eval {CHECK {print ":c3"}};
eval {INIT {print ":i2"}};
eval { $proto->can($method) } || push @nok, $method;
eval { push \@ISA, __FILE__ };
eval 'v23: $counter++; goto v23 unless $counter == 2';
eval 'v23 : $counter++; goto v23 unless $counter == 2';
$formdata->{$key} = [ $formdata->{$key}, $value ];
$func = $next{$func} until $pod{$func};
$got_arrayref ? unshift(@{$args[0]}, $cmd) : unshift(@args, $cmd);
$h{ []} = 123;
{ $h[++$i] = $_ }
High resolution alarm, sleep, gettimeofday, interval timers
if (-d "$directory/$_") { push    @ARGV, "$directory/$_" }
$i = int($i/2) until defined $self->[$i/2];
$invmap_ref->[$i] = [ $invmap_ref->[$i] ];
is(push(@ary,4), 3);
is(push(@ary,56), 4);
is(unshift(@ary,12), 5);
$i++ while $self->{ids}{"$t$i"}++;
{ --$level; push @out, ("  " x $level) . "</ul>"; }
$mod_hash->{$k} = [ $mod_hash->{$k} ];
$modlibname =~ s,[\\/][^\\/]+$,, while $c--;    # Q&D basename
my $deep1 = []; push @$deep1, $deep1;
my $deep2 = []; push @$deep2, $deep2;
my $nfound = select($_[0], $_[1], $_[2], $_[3]);
my $nfound = select($_[0], $_[1], $_[2], $gran);
my $n = unshift(@ary,5,6);
my @result = splice @temp, $self, $offset, $length, @_;
my @r = splice @a, 0, 1, "x", "y";
$_ = {name=>$_};
$n = push @a, "rec0", "rec1", "rec2";
$n = push @a, "rec3", "rec4$:";
$n = unshift @a, "rec0", "rec1", "rec2";
$n = unshift @a, "rec3", "rec4$:";
@$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
@old = splice(@h, 1, 2, qw(bananas just before));
unlink <"$filename*">;
package XS::APItest; require XSLoader; XSLoader::load()
$pa = { -exitval => $pa };
$pa = { -message => $pa };
pop @lines while $lines[-1] eq "";
pop @to while $#to and $to[$#to] == $to[$#to -1];
pop(@$x); unshift(@q, $q);
@prgs = (@prgs, $file, split "\n########\n", <$fh>) ;
print "LA LA LA\n" while 1;          # loops forever
prog => 'use Config; CHECK { $Config{awk} }',
$p->{share_dir} = { dist => [ $p->{share_dir} ] };
$p->{share_dir} = { dist => $p->{share_dir} };
-sleep
$resp = [$resp]
$r = eval q[ qr/$r(??{$x})/; ];
$r = qr/$r(??{$x})/;
s/a|/push @bar, 1/e;
$self->{DIR} = [grep $_, split ":", $self->{DIR}];
$share_dir->{dist} = [ $share_dir->{dist} ];
s![^/+]*$!man!&&-d&&!$s{$_}++&&push@m,#_;END{print"@m"}'
$spec = [$spec, $_[0]];
*s = ~(*s);
$stack[$i++] &= ~1;
$step = [$step];
sub CHECK {print ":check"}
sub INIT {print ":init"}
system("find . -type f -print     | xargs chmod 0444");
the while clause.  */
Time::HiRes - High resolution alarm, sleep, gettimeofday, interval timers
*tmpl = ~*tmpl;
*tmps = ~*tmps;
until ($i) { }
weaken($objs[@objs] = $h{$_} = []);
weaken($objs[@objs] = $$h{$_} = []);
while (1) { my $k; }
while(1) { sleep(1); }
while($foo--) { print("In thread $thread\n"); }
"words" =~ /(word|word|word)(?{push @got, $1})s$/;
"words" =~ /(word|word|word)(?{push @got,$1})s$/i;
$x->[$j] -= $BASE if $car = (($x->[$j] += $car) >= $BASE) ? 1 : 0; $j++;
$x->[scalar @$x] = 0;		# avoid || 0 test inside loop
$z = splice @a, 3, 1, "recordZ";
end
 @exceptions{@exceptions} = ();
}