Filename | /usr/share/perl/5.26/constant.pm |
Statements | Executed 362 statements in 1.85ms |
Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
---|---|---|---|---|---|
11 | 11 | 2 | 232µs | 288µs | import | constant::
1 | 1 | 1 | 29µs | 31µs | BEGIN@24 | constant::
11 | 1 | 1 | 16µs | 16µs | CORE:subst (opcode) | constant::
1 | 1 | 1 | 16µs | 16µs | BEGIN@2 | constant::
11 | 1 | 1 | 14µs | 14µs | CORE:match (opcode) | constant::
11 | 1 | 1 | 12µs | 12µs | CORE:regcomp (opcode) | constant::
1 | 1 | 1 | 9µs | 19µs | BEGIN@141 | constant::
1 | 1 | 1 | 8µs | 21µs | BEGIN@40 | constant::
1 | 1 | 1 | 8µs | 11µs | BEGIN@3 | constant::
1 | 1 | 1 | 7µs | 18µs | BEGIN@65 | constant::
1 | 1 | 1 | 7µs | 22µs | BEGIN@90 | constant::
1 | 1 | 1 | 6µs | 91µs | BEGIN@4 | constant::
3 | 3 | 1 | 3µs | 3µs | CORE:qr (opcode) | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:174] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:190] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:192] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:41] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:42] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:43] | constant::
Line | State ments |
Time on line |
Calls | Time in subs |
Code |
---|---|---|---|---|---|
1 | package constant; | ||||
2 | 2 | 44µs | 1 | 16µs | # spent 16µs within constant::BEGIN@2 which was called:
# once (16µs+0s) by Game::Collisions::AABB::BEGIN@32 at line 2 # spent 16µs making 1 call to constant::BEGIN@2 |
3 | 2 | 23µs | 2 | 15µs | # spent 11µs (8+3) within constant::BEGIN@3 which was called:
# once (8µs+3µs) by Game::Collisions::AABB::BEGIN@32 at line 3 # spent 11µs making 1 call to constant::BEGIN@3
# spent 3µs making 1 call to strict::import |
4 | 2 | 324µs | 2 | 177µs | # spent 91µs (6+86) within constant::BEGIN@4 which was called:
# once (6µs+86µs) by Game::Collisions::AABB::BEGIN@32 at line 4 # spent 91µs making 1 call to constant::BEGIN@4
# spent 86µs making 1 call to warnings::register::import |
5 | |||||
6 | 1 | 400ns | our $VERSION = '1.33'; | ||
7 | our %declared; | ||||
8 | |||||
9 | #======================================================================= | ||||
10 | |||||
11 | # Some names are evil choices. | ||||
12 | 1 | 5µs | my %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD }; | ||
13 | 1 | 1µs | $keywords{UNITCHECK}++ if $] > 5.009; | ||
14 | |||||
15 | 1 | 4µs | my %forced_into_main = map +($_, 1), | ||
16 | qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG }; | ||||
17 | |||||
18 | 1 | 5µs | my %forbidden = (%keywords, %forced_into_main); | ||
19 | |||||
20 | 1 | 8µs | 1 | 2µs | my $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/; # spent 2µs making 1 call to constant::CORE:qr |
21 | 1 | 2µs | 1 | 600ns | my $tolerable = qr/^[A-Za-z_]\w*\z/; # spent 600ns making 1 call to constant::CORE:qr |
22 | 1 | 2µs | 1 | 400ns | my $boolean = qr/^[01]?\z/; # spent 400ns making 1 call to constant::CORE:qr |
23 | |||||
24 | # spent 31µs (29+2) within constant::BEGIN@24 which was called:
# once (29µs+2µs) by Game::Collisions::AABB::BEGIN@32 at line 45 | ||||
25 | # We'd like to do use constant _CAN_PCS => $] > 5.009002 | ||||
26 | # but that's a bit tricky before we load the constant module :-) | ||||
27 | # By doing this, we save several run time checks for *every* call | ||||
28 | # to import. | ||||
29 | 1 | 1µs | my $const = $] > 5.009002; | ||
30 | 1 | 600ns | my $downgrade = $] < 5.015004; # && $] >= 5.008 | ||
31 | 1 | 600ns | my $constarray = exists &_make_const; | ||
32 | 1 | 3µs | if ($const) { | ||
33 | 1 | 19µs | 1 | 1µs | Internals::SvREADONLY($const, 1); # spent 1µs making 1 call to Internals::SvREADONLY |
34 | 1 | 3µs | 1 | 500ns | Internals::SvREADONLY($downgrade, 1); # spent 500ns making 1 call to Internals::SvREADONLY |
35 | 1 | 2µs | $constant::{_CAN_PCS} = \$const; | ||
36 | 1 | 500ns | $constant::{_DOWNGRADE} = \$downgrade; | ||
37 | 1 | 600ns | $constant::{_CAN_PCS_FOR_ARRAY} = \$constarray; | ||
38 | } | ||||
39 | else { | ||||
40 | 2 | 103µs | 2 | 34µs | # spent 21µs (8+13) within constant::BEGIN@40 which was called:
# once (8µs+13µs) by Game::Collisions::AABB::BEGIN@32 at line 40 # spent 21µs making 1 call to constant::BEGIN@40
# spent 13µs making 1 call to strict::unimport |
41 | *{"_CAN_PCS"} = sub () {$const}; | ||||
42 | *{"_DOWNGRADE"} = sub () { $downgrade }; | ||||
43 | *{"_CAN_PCS_FOR_ARRAY"} = sub () { $constarray }; | ||||
44 | } | ||||
45 | 1 | 88µs | 1 | 31µs | } # spent 31µs making 1 call to constant::BEGIN@24 |
46 | |||||
47 | #======================================================================= | ||||
48 | # import() - import symbols into user's namespace | ||||
49 | # | ||||
50 | # What we actually do is define a function in the caller's namespace | ||||
51 | # which returns the value. The function we create will normally | ||||
52 | # be inlined as a constant, thereby avoiding further sub calling | ||||
53 | # overhead. | ||||
54 | #======================================================================= | ||||
55 | # spent 288µs (232+56) within constant::import which was called 11 times, avg 26µs/call:
# once (32µs+10µs) by Game::Collisions::AABB::BEGIN@32 at line 32 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (26µs+10µs) by main::BEGIN@30 at line 30 of /home/tmurray/proj/Game-Collisions/scripts/bench.pl
# once (28µs+5µs) by Game::Collisions::AABB::BEGIN@34 at line 34 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (21µs+6µs) by Game::Collisions::AABB::BEGIN@33 at line 33 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (21µs+5µs) by main::BEGIN@31 at line 31 of /home/tmurray/proj/Game-Collisions/scripts/bench.pl
# once (20µs+4µs) by Game::Collisions::AABB::BEGIN@36 at line 36 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (18µs+4µs) by Game::Collisions::AABB::BEGIN@35 at line 35 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (18µs+3µs) by Game::Collisions::AABB::BEGIN@38 at line 38 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (17µs+3µs) by Game::Collisions::AABB::BEGIN@39 at line 39 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (16µs+4µs) by Game::Collisions::AABB::BEGIN@37 at line 37 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm
# once (16µs+3µs) by Game::Collisions::AABB::BEGIN@40 at line 40 of /home/tmurray/proj/Game-Collisions/lib/Game/Collisions/AABB.pm | ||||
56 | 11 | 3µs | my $class = shift; | ||
57 | 11 | 3µs | return unless @_; # Ignore 'use constant;' | ||
58 | 11 | 1µs | my $constants; | ||
59 | 11 | 4µs | my $multiple = ref $_[0]; | ||
60 | 11 | 4µs | my $caller = caller; | ||
61 | 11 | 2µs | my $flush_mro; | ||
62 | my $symtab; | ||||
63 | |||||
64 | 11 | 3µs | if (_CAN_PCS) { | ||
65 | 2 | 166µs | 2 | 28µs | # spent 18µs (7+11) within constant::BEGIN@65 which was called:
# once (7µs+11µs) by Game::Collisions::AABB::BEGIN@32 at line 65 # spent 18µs making 1 call to constant::BEGIN@65
# spent 11µs making 1 call to strict::unimport |
66 | 11 | 11µs | $symtab = \%{$caller . '::'}; | ||
67 | }; | ||||
68 | |||||
69 | 11 | 3µs | if ( $multiple ) { | ||
70 | if (ref $_[0] ne 'HASH') { | ||||
71 | require Carp; | ||||
72 | Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'"); | ||||
73 | } | ||||
74 | $constants = shift; | ||||
75 | } else { | ||||
76 | 11 | 2µs | unless (defined $_[0]) { | ||
77 | require Carp; | ||||
78 | Carp::croak("Can't use undef as constant name"); | ||||
79 | } | ||||
80 | 11 | 11µs | $constants->{+shift} = undef; | ||
81 | } | ||||
82 | |||||
83 | 11 | 11µs | foreach my $name ( keys %$constants ) { | ||
84 | 11 | 1µs | my $pkg; | ||
85 | 11 | 2µs | my $symtab = $symtab; | ||
86 | 11 | 2µs | my $orig_name = $name; | ||
87 | 11 | 40µs | 11 | 16µs | if ($name =~ s/(.*)(?:::|')(?=.)//s) { # spent 16µs making 11 calls to constant::CORE:subst, avg 1µs/call |
88 | $pkg = $1; | ||||
89 | if (_CAN_PCS && $pkg ne $caller) { | ||||
90 | 2 | 233µs | 2 | 37µs | # spent 22µs (7+15) within constant::BEGIN@90 which was called:
# once (7µs+15µs) by Game::Collisions::AABB::BEGIN@32 at line 90 # spent 22µs making 1 call to constant::BEGIN@90
# spent 15µs making 1 call to strict::unimport |
91 | $symtab = \%{$pkg . '::'}; | ||||
92 | } | ||||
93 | } | ||||
94 | else { | ||||
95 | 11 | 2µs | $pkg = $caller; | ||
96 | } | ||||
97 | |||||
98 | # Normal constant name | ||||
99 | 11 | 62µs | 22 | 26µs | if ($name =~ $normal_constant_name and !$forbidden{$name}) { # spent 14µs making 11 calls to constant::CORE:match, avg 1µs/call
# spent 12µs making 11 calls to constant::CORE:regcomp, avg 1µs/call |
100 | # Everything is okay | ||||
101 | |||||
102 | # Name forced into main, but we're not in main. Fatal. | ||||
103 | } elsif ($forced_into_main{$name} and $pkg ne 'main') { | ||||
104 | require Carp; | ||||
105 | Carp::croak("Constant name '$name' is forced into main::"); | ||||
106 | |||||
107 | # Starts with double underscore. Fatal. | ||||
108 | } elsif ($name =~ /^__/) { | ||||
109 | require Carp; | ||||
110 | Carp::croak("Constant name '$name' begins with '__'"); | ||||
111 | |||||
112 | # Maybe the name is tolerable | ||||
113 | } elsif ($name =~ $tolerable) { | ||||
114 | # Then we'll warn only if you've asked for warnings | ||||
115 | if (warnings::enabled()) { | ||||
116 | if ($keywords{$name}) { | ||||
117 | warnings::warn("Constant name '$name' is a Perl keyword"); | ||||
118 | } elsif ($forced_into_main{$name}) { | ||||
119 | warnings::warn("Constant name '$name' is " . | ||||
120 | "forced into package main::"); | ||||
121 | } | ||||
122 | } | ||||
123 | |||||
124 | # Looks like a boolean | ||||
125 | # use constant FRED == fred; | ||||
126 | } elsif ($name =~ $boolean) { | ||||
127 | require Carp; | ||||
128 | if (@_) { | ||||
129 | Carp::croak("Constant name '$name' is invalid"); | ||||
130 | } else { | ||||
131 | Carp::croak("Constant name looks like boolean value"); | ||||
132 | } | ||||
133 | |||||
134 | } else { | ||||
135 | # Must have bad characters | ||||
136 | require Carp; | ||||
137 | Carp::croak("Constant name '$name' has invalid characters"); | ||||
138 | } | ||||
139 | |||||
140 | { | ||||
141 | 13 | 467µs | 2 | 29µs | # spent 19µs (9+10) within constant::BEGIN@141 which was called:
# once (9µs+10µs) by Game::Collisions::AABB::BEGIN@32 at line 141 # spent 19µs making 1 call to constant::BEGIN@141
# spent 10µs making 1 call to strict::unimport |
142 | 11 | 6µs | my $full_name = "${pkg}::$name"; | ||
143 | 11 | 7µs | $declared{$full_name}++; | ||
144 | 11 | 6µs | if ($multiple || @_ == 1) { | ||
145 | 11 | 3µs | my $scalar = $multiple ? $constants->{$orig_name} : $_[0]; | ||
146 | |||||
147 | if (_DOWNGRADE) { # for 5.8 to 5.14 | ||||
148 | # Work around perl bug #31991: Sub names (actually glob | ||||
149 | # names in general) ignore the UTF8 flag. So we have to | ||||
150 | # turn it off to get the "right" symbol table entry. | ||||
151 | utf8::is_utf8 $name and utf8::encode $name; | ||||
152 | } | ||||
153 | |||||
154 | # The constant serves to optimise this entire block out on | ||||
155 | # 5.8 and earlier. | ||||
156 | 11 | 3µs | if (_CAN_PCS) { | ||
157 | # Use a reference as a proxy for a constant subroutine. | ||||
158 | # If this is not a glob yet, it saves space. If it is | ||||
159 | # a glob, we must still create it this way to get the | ||||
160 | # right internal flags set, as constants are distinct | ||||
161 | # from subroutines created with sub(){...}. | ||||
162 | # The check in Perl_ck_rvconst knows that inlinable | ||||
163 | # constants from cv_const_sv are read only. So we have to: | ||||
164 | 11 | 21µs | 11 | 6µs | Internals::SvREADONLY($scalar, 1); # spent 6µs making 11 calls to Internals::SvREADONLY, avg 509ns/call |
165 | 11 | 6µs | if (!exists $symtab->{$name}) { | ||
166 | 11 | 5µs | $symtab->{$name} = \$scalar; | ||
167 | 11 | 6µs | ++$flush_mro->{$pkg}; | ||
168 | } | ||||
169 | else { | ||||
170 | local $constant::{_dummy} = \$scalar; | ||||
171 | *$full_name = \&{"_dummy"}; | ||||
172 | } | ||||
173 | } else { | ||||
174 | *$full_name = sub () { $scalar }; | ||||
175 | } | ||||
176 | } elsif (@_) { | ||||
177 | my @list = @_; | ||||
178 | if (_CAN_PCS_FOR_ARRAY) { | ||||
179 | _make_const($list[$_]) for 0..$#list; | ||||
180 | _make_const(@list); | ||||
181 | if (!exists $symtab->{$name}) { | ||||
182 | $symtab->{$name} = \@list; | ||||
183 | $flush_mro->{$pkg}++; | ||||
184 | } | ||||
185 | else { | ||||
186 | local $constant::{_dummy} = \@list; | ||||
187 | *$full_name = \&{"_dummy"}; | ||||
188 | } | ||||
189 | } | ||||
190 | else { *$full_name = sub () { @list }; } | ||||
191 | } else { | ||||
192 | *$full_name = sub () { }; | ||||
193 | } | ||||
194 | } | ||||
195 | } | ||||
196 | # Flush the cache exactly once if we make any direct symbol table changes. | ||||
197 | 11 | 77µs | if (_CAN_PCS && $flush_mro) { | ||
198 | 11 | 35µs | 11 | 8µs | mro::method_changed_in($_) for keys %$flush_mro; # spent 8µs making 11 calls to mro::method_changed_in, avg 764ns/call |
199 | } | ||||
200 | } | ||||
201 | |||||
202 | 1 | 9µs | 1; | ||
203 | |||||
204 | __END__ | ||||
# spent 14µs within constant::CORE:match which was called 11 times, avg 1µs/call:
# 11 times (14µs+0s) by constant::import at line 99, avg 1µs/call | |||||
sub constant::CORE:qr; # opcode | |||||
# spent 12µs within constant::CORE:regcomp which was called 11 times, avg 1µs/call:
# 11 times (12µs+0s) by constant::import at line 99, avg 1µs/call | |||||
# spent 16µs within constant::CORE:subst which was called 11 times, avg 1µs/call:
# 11 times (16µs+0s) by constant::import at line 87, avg 1µs/call |