| Filename | /Users/dde/perl5/perlbrew/perls/5.18.0t/lib/5.18.0/constant.pm |
| Statements | Executed 171 statements in 964µs |
| Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
|---|---|---|---|---|---|
| 6 | 6 | 5 | 135µs | 174µs | constant::import |
| 1 | 1 | 1 | 12µs | 12µs | constant::BEGIN@2 |
| 1 | 1 | 1 | 12µs | 12µs | constant::BEGIN@24 |
| 6 | 1 | 1 | 12µs | 12µs | constant::CORE:match (opcode) |
| 6 | 1 | 1 | 12µs | 12µs | constant::CORE:regcomp (opcode) |
| 1 | 1 | 1 | 6µs | 14µs | constant::BEGIN@116 |
| 1 | 1 | 1 | 6µs | 14µs | constant::BEGIN@28 |
| 1 | 1 | 1 | 5µs | 16µs | constant::BEGIN@3 |
| 1 | 1 | 1 | 5µs | 13µs | constant::BEGIN@54 |
| 1 | 1 | 1 | 5µs | 32µs | constant::BEGIN@6 |
| 1 | 1 | 1 | 5µs | 67µs | constant::BEGIN@4 |
| 3 | 3 | 1 | 3µs | 3µs | constant::CORE:qr (opcode) |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:140] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:144] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:146] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:30] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:33] |
| Line | State ments |
Time on line |
Calls | Time in subs |
Code |
|---|---|---|---|---|---|
| 1 | package constant; | ||||
| 2 | 2 | 39µs | 1 | 12µs | # spent 12µs within constant::BEGIN@2 which was called:
# once (12µs+0s) by Try::Tiny::ScopeGuard::BEGIN@144 at line 2 # spent 12µs making 1 call to constant::BEGIN@2 |
| 3 | 2 | 21µs | 2 | 26µs | # spent 16µs (5+10) within constant::BEGIN@3 which was called:
# once (5µs+10µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 3 # spent 16µs making 1 call to constant::BEGIN@3
# spent 10µs making 1 call to strict::import |
| 4 | 2 | 22µs | 2 | 128µs | # spent 67µs (5+62) within constant::BEGIN@4 which was called:
# once (5µs+62µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 4 # spent 67µs making 1 call to constant::BEGIN@4
# spent 62µs making 1 call to warnings::register::import |
| 5 | |||||
| 6 | 2 | 114µs | 2 | 59µs | # spent 32µs (5+27) within constant::BEGIN@6 which was called:
# once (5µs+27µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 6 # spent 32µs making 1 call to constant::BEGIN@6
# spent 27µs making 1 call to vars::import |
| 7 | 1 | 400ns | $VERSION = '1.27'; | ||
| 8 | |||||
| 9 | #======================================================================= | ||||
| 10 | |||||
| 11 | # Some names are evil choices. | ||||
| 12 | 1 | 4µs | my %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD }; | ||
| 13 | 1 | 800ns | $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 | 4µs | my %forbidden = (%keywords, %forced_into_main); | ||
| 19 | |||||
| 20 | 1 | 6µs | 1 | 2µs | my $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/; # spent 2µs making 1 call to constant::CORE:qr |
| 21 | 1 | 3µs | 1 | 700ns | my $tolerable = qr/^[A-Za-z_]\w*\z/; # spent 700ns making 1 call to constant::CORE:qr |
| 22 | 1 | 2µs | 1 | 600ns | my $boolean = qr/^[01]?\z/; # spent 600ns making 1 call to constant::CORE:qr |
| 23 | |||||
| 24 | # spent 12µs within constant::BEGIN@24 which was called:
# once (12µs+0s) by Try::Tiny::ScopeGuard::BEGIN@144 at line 34 | ||||
| 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 1 run time check for *every* call to import. | ||||
| 28 | 2 | 64µs | 2 | 22µs | # spent 14µs (6+8) within constant::BEGIN@28 which was called:
# once (6µs+8µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 28 # spent 14µs making 1 call to constant::BEGIN@28
# spent 8µs making 1 call to strict::unimport |
| 29 | 1 | 700ns | my $const = $] > 5.009002; | ||
| 30 | 1 | 6µs | *_CAN_PCS = sub () {$const}; | ||
| 31 | |||||
| 32 | 1 | 400ns | my $downgrade = $] < 5.015004; # && $] >= 5.008 | ||
| 33 | 1 | 8µs | *_DOWNGRADE = sub () { $downgrade }; | ||
| 34 | 1 | 59µs | 1 | 12µs | } # spent 12µs making 1 call to constant::BEGIN@24 |
| 35 | |||||
| 36 | #======================================================================= | ||||
| 37 | # import() - import symbols into user's namespace | ||||
| 38 | # | ||||
| 39 | # What we actually do is define a function in the caller's namespace | ||||
| 40 | # which returns the value. The function we create will normally | ||||
| 41 | # be inlined as a constant, thereby avoiding further sub calling | ||||
| 42 | # overhead. | ||||
| 43 | #======================================================================= | ||||
| 44 | # spent 174µs (135+39) within constant::import which was called 6 times, avg 29µs/call:
# once (28µs+8µs) by Data::Dumper::BEGIN@271 at line 271 of Data/Dumper.pm
# once (27µs+8µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 144 of Try/Tiny.pm
# once (25µs+6µs) by namespace::clean::BEGIN@146 at line 146 of namespace/clean.pm
# once (19µs+8µs) by Eval::Closure::BEGIN@20 at line 20 of Eval/Closure.pm
# once (18µs+5µs) by Class::MOP::Method::Meta::BEGIN@16 at line 16 of Class/MOP/Method/Meta.pm
# once (17µs+4µs) by namespace::clean::BEGIN@147 at line 147 of namespace/clean.pm | ||||
| 45 | 6 | 2µs | my $class = shift; | ||
| 46 | 6 | 2µs | return unless @_; # Ignore 'use constant;' | ||
| 47 | 6 | 200ns | my $constants; | ||
| 48 | 6 | 2µs | my $multiple = ref $_[0]; | ||
| 49 | 6 | 3µs | my $pkg = caller; | ||
| 50 | 6 | 200ns | my $flush_mro; | ||
| 51 | 6 | 200ns | my $symtab; | ||
| 52 | |||||
| 53 | 6 | 800ns | if (_CAN_PCS) { | ||
| 54 | 2 | 221µs | 2 | 21µs | # spent 13µs (5+8) within constant::BEGIN@54 which was called:
# once (5µs+8µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 54 # spent 13µs making 1 call to constant::BEGIN@54
# spent 8µs making 1 call to strict::unimport |
| 55 | 6 | 5µs | $symtab = \%{$pkg . '::'}; | ||
| 56 | }; | ||||
| 57 | |||||
| 58 | 6 | 1µs | if ( $multiple ) { | ||
| 59 | if (ref $_[0] ne 'HASH') { | ||||
| 60 | require Carp; | ||||
| 61 | Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'"); | ||||
| 62 | } | ||||
| 63 | $constants = shift; | ||||
| 64 | } else { | ||||
| 65 | 6 | 1µs | unless (defined $_[0]) { | ||
| 66 | require Carp; | ||||
| 67 | Carp::croak("Can't use undef as constant name"); | ||||
| 68 | } | ||||
| 69 | 6 | 6µs | $constants->{+shift} = undef; | ||
| 70 | } | ||||
| 71 | |||||
| 72 | 6 | 9µs | foreach my $name ( keys %$constants ) { | ||
| 73 | # Normal constant name | ||||
| 74 | 6 | 49µs | 12 | 24µs | if ($name =~ $normal_constant_name and !$forbidden{$name}) { # spent 12µs making 6 calls to constant::CORE:match, avg 2µs/call
# spent 12µs making 6 calls to constant::CORE:regcomp, avg 2µs/call |
| 75 | # Everything is okay | ||||
| 76 | |||||
| 77 | # Name forced into main, but we're not in main. Fatal. | ||||
| 78 | } elsif ($forced_into_main{$name} and $pkg ne 'main') { | ||||
| 79 | require Carp; | ||||
| 80 | Carp::croak("Constant name '$name' is forced into main::"); | ||||
| 81 | |||||
| 82 | # Starts with double underscore. Fatal. | ||||
| 83 | } elsif ($name =~ /^__/) { | ||||
| 84 | require Carp; | ||||
| 85 | Carp::croak("Constant name '$name' begins with '__'"); | ||||
| 86 | |||||
| 87 | # Maybe the name is tolerable | ||||
| 88 | } elsif ($name =~ $tolerable) { | ||||
| 89 | # Then we'll warn only if you've asked for warnings | ||||
| 90 | if (warnings::enabled()) { | ||||
| 91 | if ($keywords{$name}) { | ||||
| 92 | warnings::warn("Constant name '$name' is a Perl keyword"); | ||||
| 93 | } elsif ($forced_into_main{$name}) { | ||||
| 94 | warnings::warn("Constant name '$name' is " . | ||||
| 95 | "forced into package main::"); | ||||
| 96 | } | ||||
| 97 | } | ||||
| 98 | |||||
| 99 | # Looks like a boolean | ||||
| 100 | # use constant FRED == fred; | ||||
| 101 | } elsif ($name =~ $boolean) { | ||||
| 102 | require Carp; | ||||
| 103 | if (@_) { | ||||
| 104 | Carp::croak("Constant name '$name' is invalid"); | ||||
| 105 | } else { | ||||
| 106 | Carp::croak("Constant name looks like boolean value"); | ||||
| 107 | } | ||||
| 108 | |||||
| 109 | } else { | ||||
| 110 | # Must have bad characters | ||||
| 111 | require Carp; | ||||
| 112 | Carp::croak("Constant name '$name' has invalid characters"); | ||||
| 113 | } | ||||
| 114 | |||||
| 115 | { | ||||
| 116 | 8 | 216µs | 2 | 22µs | # spent 14µs (6+8) within constant::BEGIN@116 which was called:
# once (6µs+8µs) by Try::Tiny::ScopeGuard::BEGIN@144 at line 116 # spent 14µs making 1 call to constant::BEGIN@116
# spent 8µs making 1 call to strict::unimport |
| 117 | 6 | 4µs | my $full_name = "${pkg}::$name"; | ||
| 118 | 6 | 4µs | $declared{$full_name}++; | ||
| 119 | 6 | 3µs | if ($multiple || @_ == 1) { | ||
| 120 | 6 | 2µs | my $scalar = $multiple ? $constants->{$name} : $_[0]; | ||
| 121 | |||||
| 122 | if (_DOWNGRADE) { # for 5.8 to 5.14 | ||||
| 123 | # Work around perl bug #31991: Sub names (actually glob | ||||
| 124 | # names in general) ignore the UTF8 flag. So we have to | ||||
| 125 | # turn it off to get the "right" symbol table entry. | ||||
| 126 | utf8::is_utf8 $name and utf8::encode $name; | ||||
| 127 | } | ||||
| 128 | |||||
| 129 | # The constant serves to optimise this entire block out on | ||||
| 130 | # 5.8 and earlier. | ||||
| 131 | 6 | 3µs | if (_CAN_PCS && $symtab && !exists $symtab->{$name}) { | ||
| 132 | # No typeglob yet, so we can use a reference as space- | ||||
| 133 | # efficient proxy for a constant subroutine | ||||
| 134 | # The check in Perl_ck_rvconst knows that inlinable | ||||
| 135 | # constants from cv_const_sv are read only. So we have to: | ||||
| 136 | 6 | 20µs | 6 | 8µs | Internals::SvREADONLY($scalar, 1); # spent 8µs making 6 calls to Internals::SvREADONLY, avg 1µs/call |
| 137 | 6 | 3µs | $symtab->{$name} = \$scalar; | ||
| 138 | 6 | 2µs | ++$flush_mro; | ||
| 139 | } else { | ||||
| 140 | *$full_name = sub () { $scalar }; | ||||
| 141 | } | ||||
| 142 | } elsif (@_) { | ||||
| 143 | my @list = @_; | ||||
| 144 | *$full_name = sub () { @list }; | ||||
| 145 | } else { | ||||
| 146 | *$full_name = sub () { }; | ||||
| 147 | } | ||||
| 148 | } | ||||
| 149 | } | ||||
| 150 | # Flush the cache exactly once if we make any direct symbol table changes. | ||||
| 151 | 6 | 40µs | 6 | 7µs | mro::method_changed_in($pkg) if _CAN_PCS && $flush_mro; # spent 7µs making 6 calls to mro::method_changed_in, avg 1µs/call |
| 152 | } | ||||
| 153 | |||||
| 154 | 1 | 7µs | 1; | ||
| 155 | |||||
| 156 | __END__ | ||||
# spent 12µs within constant::CORE:match which was called 6 times, avg 2µs/call:
# 6 times (12µs+0s) by constant::import at line 74, avg 2µs/call | |||||
sub constant::CORE:qr; # opcode | |||||
# spent 12µs within constant::CORE:regcomp which was called 6 times, avg 2µs/call:
# 6 times (12µs+0s) by constant::import at line 74, avg 2µs/call |