| Filename | /home/ss5/perl5/perlbrew/perls/tapper-perl/lib/5.16.3/constant.pm |
| Statements | Executed 319 statements in 1.93ms |
| Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
|---|---|---|---|---|---|
| 4 | 4 | 4 | 341µs | 426µs | constant::import |
| 1 | 1 | 1 | 188µs | 13.1ms | constant::BEGIN@25 |
| 1 | 1 | 1 | 184µs | 184µs | constant::BEGIN@36 |
| 26 | 4 | 1 | 48µs | 48µs | constant::CORE:regcomp (opcode) |
| 23 | 1 | 1 | 41µs | 41µs | constant::CORE:match (opcode) |
| 1 | 1 | 1 | 18µs | 18µs | constant::BEGIN@2 |
| 1 | 1 | 1 | 14µs | 31µs | constant::BEGIN@65 |
| 1 | 1 | 1 | 13µs | 151µs | constant::BEGIN@4 |
| 1 | 1 | 1 | 12µs | 28µs | constant::BEGIN@3 |
| 1 | 1 | 1 | 12µs | 54µs | constant::BEGIN@6 |
| 1 | 1 | 1 | 10µs | 22µs | constant::BEGIN@127 |
| 1 | 1 | 1 | 10µs | 24µs | constant::BEGIN@29 |
| 3 | 3 | 1 | 8µs | 8µs | constant::CORE:qr (opcode) |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:151] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:155] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:157] |
| 0 | 0 | 0 | 0s | 0s | constant::__ANON__[:31] |
| Line | State ments |
Time on line |
Calls | Time in subs |
Code |
|---|---|---|---|---|---|
| 1 | package constant; | ||||
| 2 | 2 | 53µs | 1 | 18µs | # spent 18µs within constant::BEGIN@2 which was called:
# once (18µs+0s) by Data::Dumper::BEGIN@270 at line 2 # spent 18µs making 1 call to constant::BEGIN@2 |
| 3 | 2 | 30µs | 2 | 44µs | # spent 28µs (12+16) within constant::BEGIN@3 which was called:
# once (12µs+16µs) by Data::Dumper::BEGIN@270 at line 3 # spent 28µs making 1 call to constant::BEGIN@3
# spent 16µs making 1 call to strict::import |
| 4 | 2 | 35µs | 2 | 288µs | # spent 151µs (13+138) within constant::BEGIN@4 which was called:
# once (13µs+138µs) by Data::Dumper::BEGIN@270 at line 4 # spent 151µs making 1 call to constant::BEGIN@4
# spent 138µs making 1 call to warnings::register::import |
| 5 | |||||
| 6 | 2 | 127µs | 2 | 97µs | # spent 54µs (12+43) within constant::BEGIN@6 which was called:
# once (12µs+43µs) by Data::Dumper::BEGIN@270 at line 6 # spent 54µs making 1 call to constant::BEGIN@6
# spent 43µs making 1 call to vars::import |
| 7 | 1 | 600ns | $VERSION = '1.23'; | ||
| 8 | |||||
| 9 | #======================================================================= | ||||
| 10 | |||||
| 11 | # Some names are evil choices. | ||||
| 12 | 1 | 7µs | my %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD }; | ||
| 13 | 1 | 2µs | $keywords{UNITCHECK}++ if $] > 5.009; | ||
| 14 | |||||
| 15 | 1 | 6µs | my %forced_into_main = map +($_, 1), | ||
| 16 | qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG }; | ||||
| 17 | |||||
| 18 | 1 | 7µs | my %forbidden = (%keywords, %forced_into_main); | ||
| 19 | |||||
| 20 | 1 | 800ns | my $str_end = $] >= 5.006 ? "\\z" : "\\Z"; | ||
| 21 | 1 | 38µs | 2 | 25µs | my $normal_constant_name = qr/^_?[^\W_0-9]\w*$str_end/; # spent 19µs making 1 call to constant::CORE:regcomp
# spent 6µs making 1 call to constant::CORE:qr |
| 22 | 1 | 13µs | 2 | 7µs | my $tolerable = qr/^[A-Za-z_]\w*$str_end/; # spent 6µs making 1 call to constant::CORE:regcomp
# spent 1µs making 1 call to constant::CORE:qr |
| 23 | 1 | 12µs | 2 | 6µs | my $boolean = qr/^[01]?$str_end/; # spent 5µs making 1 call to constant::CORE:regcomp
# spent 1µs making 1 call to constant::CORE:qr |
| 24 | |||||
| 25 | # spent 13.1ms (188µs+12.9) within constant::BEGIN@25 which was called:
# once (188µs+12.9ms) by Data::Dumper::BEGIN@270 at line 45 | ||||
| 26 | # We'd like to do use constant _CAN_PCS => $] > 5.009002 | ||||
| 27 | # but that's a bit tricky before we load the constant module :-) | ||||
| 28 | # By doing this, we save 1 run time check for *every* call to import. | ||||
| 29 | 2 | 155µs | 2 | 38µs | # spent 24µs (10+14) within constant::BEGIN@29 which was called:
# once (10µs+14µs) by Data::Dumper::BEGIN@270 at line 29 # spent 24µs making 1 call to constant::BEGIN@29
# spent 14µs making 1 call to strict::unimport |
| 30 | 1 | 2µs | my $const = $] > 5.009002; | ||
| 31 | 1 | 6µs | *_CAN_PCS = sub () {$const}; | ||
| 32 | |||||
| 33 | # Before this makes its way into a dev perl release, we have to do | ||||
| 34 | # browser-sniffing, as it were.... | ||||
| 35 | 1 | 200ns | return unless $const; | ||
| 36 | 3 | 326µs | 1 | 3.09ms | # spent 184µs within constant::BEGIN@36 which was called:
# once (184µs+0s) by constant::BEGIN@25 at line 45 # spent 3.09ms making 1 call to utf8::AUTOLOAD |
| 37 | 1 | 6µs | if (exists ${__PACKAGE__."::"}{"\xc4\x80"}) { | ||
| 38 | delete ${__PACKAGE__."::"}{"\xc4\x80"}; | ||||
| 39 | *_DOWNGRADE = sub () {1}; | ||||
| 40 | } | ||||
| 41 | else { | ||||
| 42 | 1 | 3µs | delete ${__PACKAGE__."::"}{chr 256}; | ||
| 43 | 1 | 2µs | *_DOWNGRADE = sub () {0}; | ||
| 44 | } | ||||
| 45 | 1 | 103µs | 2 | 13.3ms | } # spent 13.1ms making 1 call to constant::BEGIN@25
# spent 184µs making 1 call to constant::BEGIN@36 |
| 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 426µs (341+84) within constant::import which was called 4 times, avg 106µs/call:
# once (141µs+33µs) by Data::DPath::Context::BEGIN@52 at line 52 of lib/Data/DPath/Context.pm
# once (107µs+27µs) by Data::DPath::Path::BEGIN@21 at line 21 of lib/Data/DPath/Path.pm
# once (51µs+14µs) by Data::DPath::Filters::BEGIN@9 at line 10 of lib/Data/DPath/Filters.pm
# once (42µs+10µs) by Data::Dumper::BEGIN@270 at line 270 of Data/Dumper.pm | ||||
| 56 | 4 | 3µs | my $class = shift; | ||
| 57 | 4 | 2µs | return unless @_; # Ignore 'use constant;' | ||
| 58 | 4 | 900ns | my $constants; | ||
| 59 | 4 | 4µs | my $multiple = ref $_[0]; | ||
| 60 | 4 | 3µs | my $pkg = caller; | ||
| 61 | 4 | 700ns | my $flush_mro; | ||
| 62 | 4 | 700ns | my $symtab; | ||
| 63 | |||||
| 64 | 4 | 2µs | if (_CAN_PCS) { | ||
| 65 | 2 | 271µs | 2 | 49µs | # spent 31µs (14+18) within constant::BEGIN@65 which was called:
# once (14µs+18µs) by Data::Dumper::BEGIN@270 at line 65 # spent 31µs making 1 call to constant::BEGIN@65
# spent 18µs making 1 call to strict::unimport |
| 66 | 4 | 8µs | $symtab = \%{$pkg . '::'}; | ||
| 67 | }; | ||||
| 68 | |||||
| 69 | 4 | 2µs | if ( $multiple ) { | ||
| 70 | 3 | 2µs | if (ref $_[0] ne 'HASH') { | ||
| 71 | require Carp; | ||||
| 72 | Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'"); | ||||
| 73 | } | ||||
| 74 | 3 | 1µs | $constants = shift; | ||
| 75 | } else { | ||||
| 76 | 1 | 400ns | unless (defined $_[0]) { | ||
| 77 | require Carp; | ||||
| 78 | Carp::croak("Can't use undef as constant name"); | ||||
| 79 | } | ||||
| 80 | 1 | 1µs | $constants->{+shift} = undef; | ||
| 81 | } | ||||
| 82 | |||||
| 83 | 4 | 12µs | foreach my $name ( keys %$constants ) { | ||
| 84 | # Normal constant name | ||||
| 85 | 23 | 158µs | 46 | 59µs | if ($name =~ $normal_constant_name and !$forbidden{$name}) { # spent 41µs making 23 calls to constant::CORE:match, avg 2µs/call
# spent 18µs making 23 calls to constant::CORE:regcomp, avg 787ns/call |
| 86 | # Everything is okay | ||||
| 87 | |||||
| 88 | # Name forced into main, but we're not in main. Fatal. | ||||
| 89 | } elsif ($forced_into_main{$name} and $pkg ne 'main') { | ||||
| 90 | require Carp; | ||||
| 91 | Carp::croak("Constant name '$name' is forced into main::"); | ||||
| 92 | |||||
| 93 | # Starts with double underscore. Fatal. | ||||
| 94 | } elsif ($name =~ /^__/) { | ||||
| 95 | require Carp; | ||||
| 96 | Carp::croak("Constant name '$name' begins with '__'"); | ||||
| 97 | |||||
| 98 | # Maybe the name is tolerable | ||||
| 99 | } elsif ($name =~ $tolerable) { | ||||
| 100 | # Then we'll warn only if you've asked for warnings | ||||
| 101 | if (warnings::enabled()) { | ||||
| 102 | if ($keywords{$name}) { | ||||
| 103 | warnings::warn("Constant name '$name' is a Perl keyword"); | ||||
| 104 | } elsif ($forced_into_main{$name}) { | ||||
| 105 | warnings::warn("Constant name '$name' is " . | ||||
| 106 | "forced into package main::"); | ||||
| 107 | } | ||||
| 108 | } | ||||
| 109 | |||||
| 110 | # Looks like a boolean | ||||
| 111 | # use constant FRED == fred; | ||||
| 112 | } elsif ($name =~ $boolean) { | ||||
| 113 | require Carp; | ||||
| 114 | if (@_) { | ||||
| 115 | Carp::croak("Constant name '$name' is invalid"); | ||||
| 116 | } else { | ||||
| 117 | Carp::croak("Constant name looks like boolean value"); | ||||
| 118 | } | ||||
| 119 | |||||
| 120 | } else { | ||||
| 121 | # Must have bad characters | ||||
| 122 | require Carp; | ||||
| 123 | Carp::croak("Constant name '$name' has invalid characters"); | ||||
| 124 | } | ||||
| 125 | |||||
| 126 | { | ||||
| 127 | 25 | 301µs | 2 | 35µs | # spent 22µs (10+13) within constant::BEGIN@127 which was called:
# once (10µs+13µs) by Data::Dumper::BEGIN@270 at line 127 # spent 22µs making 1 call to constant::BEGIN@127
# spent 13µs making 1 call to strict::unimport |
| 128 | 23 | 18µs | my $full_name = "${pkg}::$name"; | ||
| 129 | 23 | 22µs | $declared{$full_name}++; | ||
| 130 | 23 | 11µs | if ($multiple || @_ == 1) { | ||
| 131 | 23 | 12µs | my $scalar = $multiple ? $constants->{$name} : $_[0]; | ||
| 132 | |||||
| 133 | if (_DOWNGRADE) { # for 5.10 to 5.14 | ||||
| 134 | # Work around perl bug #31991: Sub names (actually glob | ||||
| 135 | # names in general) ignore the UTF8 flag. So we have to | ||||
| 136 | # turn it off to get the "right" symbol table entry. | ||||
| 137 | utf8::is_utf8 $name and utf8::encode $name; | ||||
| 138 | } | ||||
| 139 | |||||
| 140 | # The constant serves to optimise this entire block out on | ||||
| 141 | # 5.8 and earlier. | ||||
| 142 | 23 | 18µs | if (_CAN_PCS && $symtab && !exists $symtab->{$name}) { | ||
| 143 | # No typeglob yet, so we can use a reference as space- | ||||
| 144 | # efficient proxy for a constant subroutine | ||||
| 145 | # The check in Perl_ck_rvconst knows that inlinable | ||||
| 146 | # constants from cv_const_sv are read only. So we have to: | ||||
| 147 | 23 | 72µs | 23 | 18µs | Internals::SvREADONLY($scalar, 1); # spent 18µs making 23 calls to Internals::SvREADONLY, avg 791ns/call |
| 148 | 23 | 17µs | $symtab->{$name} = \$scalar; | ||
| 149 | 23 | 8µs | ++$flush_mro; | ||
| 150 | } else { | ||||
| 151 | *$full_name = sub () { $scalar }; | ||||
| 152 | } | ||||
| 153 | } elsif (@_) { | ||||
| 154 | my @list = @_; | ||||
| 155 | *$full_name = sub () { @list }; | ||||
| 156 | } else { | ||||
| 157 | *$full_name = sub () { }; | ||||
| 158 | } | ||||
| 159 | } | ||||
| 160 | } | ||||
| 161 | # Flush the cache exactly once if we make any direct symbol table changes. | ||||
| 162 | 4 | 39µs | 4 | 7µs | mro::method_changed_in($pkg) if _CAN_PCS && $flush_mro; # spent 7µs making 4 calls to mro::method_changed_in, avg 2µs/call |
| 163 | } | ||||
| 164 | |||||
| 165 | 1 | 12µs | 1; | ||
| 166 | |||||
| 167 | __END__ | ||||
# spent 41µs within constant::CORE:match which was called 23 times, avg 2µs/call:
# 23 times (41µs+0s) by constant::import at line 85, avg 2µs/call | |||||
sub constant::CORE:qr; # opcode | |||||
# spent 48µs within constant::CORE:regcomp which was called 26 times, avg 2µs/call:
# 23 times (18µs+0s) by constant::import at line 85, avg 787ns/call
# once (19µs+0s) by Data::Dumper::BEGIN@270 at line 21
# once (6µs+0s) by Data::Dumper::BEGIN@270 at line 22
# once (5µs+0s) by Data::Dumper::BEGIN@270 at line 23 |