| 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 | constant::import |
| 1 | 1 | 1 | 29µs | 31µs | constant::BEGIN@24 |
| 11 | 1 | 1 | 16µs | 16µs | constant::CORE:subst (opcode) |
| 1 | 1 | 1 | 16µs | 16µs | constant::BEGIN@2 |
| 11 | 1 | 1 | 14µs | 14µs | constant::CORE:match (opcode) |
| 11 | 1 | 1 | 12µs | 12µs | constant::CORE:regcomp (opcode) |
| 1 | 1 | 1 | 9µs | 19µs | constant::BEGIN@141 |
| 1 | 1 | 1 | 8µs | 21µs | constant::BEGIN@40 |
| 1 | 1 | 1 | 8µs | 11µs | constant::BEGIN@3 |
| 1 | 1 | 1 | 7µs | 18µs | constant::BEGIN@65 |
| 1 | 1 | 1 | 7µs | 22µs | constant::BEGIN@90 |
| 1 | 1 | 1 | 6µs | 91µs | constant::BEGIN@4 |
| 3 | 3 | 1 | 3µs | 3µs | constant::CORE:qr (opcode) |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:174] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:190] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:192] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:41] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:42] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:43] |
| 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 |