← Index
NYTProf Performance Profile   « line view »
For -e
  Run on Thu Jun 30 16:34:56 2016
Reported on Thu Jun 30 16:35:08 2016

Filename/home/s1/perl5/perlbrew/perls/perl-5.22.1/lib/5.22.1/constant.pm
StatementsExecuted 689 statements in 2.40ms
Subroutines
Calls P F Exclusive
Time
Inclusive
Time
Subroutine
22225589µs758µsconstant::::importconstant::import
221147µs47µsconstant::::CORE:substconstant::CORE:subst (opcode)
221144µs44µsconstant::::CORE:matchconstant::CORE:match (opcode)
221138µs38µsconstant::::CORE:regcompconstant::CORE:regcomp (opcode)
11119µs19µsconstant::::BEGIN@2constant::BEGIN@2
11118µs20µsconstant::::BEGIN@24constant::BEGIN@24
11110µs21µsconstant::::BEGIN@141constant::BEGIN@141
1119µs24µsconstant::::BEGIN@40constant::BEGIN@40
1118µs11µsconstant::::BEGIN@3constant::BEGIN@3
1118µs19µsconstant::::BEGIN@90constant::BEGIN@90
1118µs99µsconstant::::BEGIN@4constant::BEGIN@4
1118µs18µsconstant::::BEGIN@65constant::BEGIN@65
3313µs3µsconstant::::CORE:qrconstant::CORE:qr (opcode)
0000s0sconstant::::__ANON__[:174]constant::__ANON__[:174]
0000s0sconstant::::__ANON__[:190]constant::__ANON__[:190]
0000s0sconstant::::__ANON__[:192]constant::__ANON__[:192]
0000s0sconstant::::__ANON__[:41]constant::__ANON__[:41]
0000s0sconstant::::__ANON__[:42]constant::__ANON__[:42]
0000s0sconstant::::__ANON__[:43]constant::__ANON__[:43]
Call graph for these subroutines as a Graphviz dot language file.
Line State
ments
Time
on line
Calls Time
in subs
Code
1package constant;
2245µs119µs
# spent 19µs within constant::BEGIN@2 which was called: # once (19µs+0s) by File::Spec::Unix::BEGIN@130 at line 2
use 5.008;
# spent 19µs making 1 call to constant::BEGIN@2
3225µs213µs
# spent 11µs (8+3) within constant::BEGIN@3 which was called: # once (8µs+3µs) by File::Spec::Unix::BEGIN@130 at line 3
use strict;
# spent 11µs making 1 call to constant::BEGIN@3 # spent 2µs making 1 call to strict::import
42543µs2190µs
# spent 99µs (8+91) within constant::BEGIN@4 which was called: # once (8µs+91µs) by File::Spec::Unix::BEGIN@130 at line 4
use warnings::register;
# spent 99µs making 1 call to constant::BEGIN@4 # spent 91µs making 1 call to warnings::register::import
5
61600nsour $VERSION = '1.33';
7our %declared;
8
9#=======================================================================
10
11# Some names are evil choices.
1216µsmy %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD };
1312µs$keywords{UNITCHECK}++ if $] > 5.009;
14
1516µsmy %forced_into_main = map +($_, 1),
16 qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG };
17
1815µsmy %forbidden = (%keywords, %forced_into_main);
19
2018µs12µsmy $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/;
# spent 2µs making 1 call to constant::CORE:qr
2113µs1600nsmy $tolerable = qr/^[A-Za-z_]\w*\z/;
# spent 600ns making 1 call to constant::CORE:qr
2213µs1700nsmy $boolean = qr/^[01]?\z/;
# spent 700ns making 1 call to constant::CORE:qr
23
24
# spent 20µs (18+2) within constant::BEGIN@24 which was called: # once (18µs+2µs) by File::Spec::Unix::BEGIN@130 at line 45
BEGIN {
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.
2912µs my $const = $] > 5.009002;
301600ns my $downgrade = $] < 5.015004; # && $] >= 5.008
311500ns my $constarray = exists &_make_const;
3213µs if ($const) {
3317µs11µs Internals::SvREADONLY($const, 1);
# spent 1µs making 1 call to Internals::SvREADONLY
3413µs1600ns Internals::SvREADONLY($downgrade, 1);
# spent 600ns making 1 call to Internals::SvREADONLY
3512µs $constant::{_CAN_PCS} = \$const;
361300ns $constant::{_DOWNGRADE} = \$downgrade;
371600ns $constant::{_CAN_PCS_FOR_ARRAY} = \$constarray;
38 }
39 else {
402100µs239µs
# spent 24µs (9+15) within constant::BEGIN@40 which was called: # once (9µs+15µs) by File::Spec::Unix::BEGIN@130 at line 40
no strict 'refs';
# spent 24µs making 1 call to constant::BEGIN@40 # spent 15µs making 1 call to strict::unimport
41 *{"_CAN_PCS"} = sub () {$const};
42 *{"_DOWNGRADE"} = sub () { $downgrade };
43 *{"_CAN_PCS_FOR_ARRAY"} = sub () { $constarray };
44 }
45178µs120µs}
# spent 20µs 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 758µs (589+169) within constant::import which was called 22 times, avg 34µs/call: # once (44µs+16µs) by File::Spec::Unix::BEGIN@130 at line 130 of File/Spec/Unix.pm # once (37µs+12µs) by DateTime::TimeZone::BEGIN@18 at line 18 of DateTime/TimeZone.pm # once (37µs+12µs) by Try::Tiny::ScopeGuard::BEGIN@161 at line 161 of Try/Tiny.pm # once (31µs+10µs) by File::Spec::Unix::BEGIN@223 at line 223 of File/Spec/Unix.pm # once (31µs+9µs) by DateTime::BEGIN@72 at line 72 of DateTime.pm # once (33µs+7µs) by DateTime::BEGIN@74 at line 74 of DateTime.pm # once (30µs+7µs) by File::Spec::Unix::BEGIN@148 at line 148 of File/Spec/Unix.pm # once (29µs+8µs) by File::Spec::Unix::BEGIN@245 at line 245 of File/Spec/Unix.pm # once (28µs+8µs) by DateTime::Duration::BEGIN@22 at line 22 of DateTime/Duration.pm # once (28µs+8µs) by File::Spec::Unix::BEGIN@139 at line 139 of File/Spec/Unix.pm # once (25µs+7µs) by DateTime::BEGIN@75 at line 75 of DateTime.pm # once (24µs+7µs) by DateTime::TimeZone::BEGIN@19 at line 19 of DateTime/TimeZone.pm # once (22µs+6µs) by DateTime::TimeZone::BEGIN@22 at line 22 of DateTime/TimeZone.pm # once (22µs+6µs) by DateTime::TimeZone::BEGIN@24 at line 24 of DateTime/TimeZone.pm # once (22µs+6µs) by DateTime::TimeZone::BEGIN@23 at line 23 of DateTime/TimeZone.pm # once (22µs+6µs) by DateTime::BEGIN@78 at line 78 of DateTime.pm # once (22µs+6µs) by DateTime::TimeZone::BEGIN@28 at line 28 of DateTime/TimeZone.pm # once (22µs+5µs) by DateTime::BEGIN@76 at line 76 of DateTime.pm # once (21µs+6µs) by DateTime::TimeZone::BEGIN@25 at line 25 of DateTime/TimeZone.pm # once (20µs+5µs) by DateTime::BEGIN@80 at line 80 of DateTime.pm # once (20µs+5µs) by DateTime::TimeZone::BEGIN@26 at line 26 of DateTime/TimeZone.pm # once (20µs+5µs) by DateTime::TimeZone::BEGIN@27 at line 27 of DateTime/TimeZone.pm
sub import {
56228µs my $class = shift;
57228µs return unless @_; # Ignore 'use constant;'
58223µs my $constants;
59228µs my $multiple = ref $_[0];
602210µs my $caller = caller;
61224µs my $flush_mro;
62 my $symtab;
63
64227µs if (_CAN_PCS) {
652156µs228µs
# spent 18µs (8+10) within constant::BEGIN@65 which was called: # once (8µs+10µs) by File::Spec::Unix::BEGIN@130 at line 65
no strict 'refs';
# spent 18µs making 1 call to constant::BEGIN@65 # spent 10µs making 1 call to strict::unimport
662226µs $symtab = \%{$caller . '::'};
67 };
68
69225µs 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 {
76225µs unless (defined $_[0]) {
77 require Carp;
78 Carp::croak("Can't use undef as constant name");
79 }
802227µs $constants->{+shift} = undef;
81 }
82
832230µs foreach my $name ( keys %$constants ) {
84222µs my $pkg;
85224µs my $symtab = $symtab;
86224µs my $orig_name = $name;
8722110µs2247µs if ($name =~ s/(.*)(?:::|')(?=.)//s) {
# spent 47µs making 22 calls to constant::CORE:subst, avg 2µs/call
88 $pkg = $1;
89 if (_CAN_PCS && $pkg ne $caller) {
902212µs229µs
# spent 19µs (8+11) within constant::BEGIN@90 which was called: # once (8µs+11µs) by File::Spec::Unix::BEGIN@130 at line 90
no strict 'refs';
# spent 19µs making 1 call to constant::BEGIN@90 # spent 11µs making 1 call to strict::unimport
91 $symtab = \%{$pkg . '::'};
92 }
93 }
94 else {
95226µs $pkg = $caller;
96 }
97
98 # Normal constant name
9922159µs4483µs if ($name =~ $normal_constant_name and !$forbidden{$name}) {
# spent 44µs making 22 calls to constant::CORE:match, avg 2µs/call # spent 38µs making 22 calls to constant::CORE:regcomp, avg 2µs/call
100 # Everything is okay
101
102 # Name forced into main, but we're not in main. Fatal.
103 } elsif ($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 {
14124406µs231µs
# spent 21µs (10+11) within constant::BEGIN@141 which was called: # once (10µs+11µs) by File::Spec::Unix::BEGIN@130 at line 141
no strict 'refs';
# spent 21µs making 1 call to constant::BEGIN@141 # spent 10µs making 1 call to strict::unimport
1422218µs my $full_name = "${pkg}::$name";
1432220µs $declared{$full_name}++;
1442215µs if ($multiple || @_ == 1) {
145227µs 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 $name;
152 }
153
154 # The constant serves to optimise this entire block out on
155 # 5.8 and earlier.
156226µs if (_CAN_PCS) {
157 # Use a reference as a proxy for a constant subroutine.
158 # If this is not a glob yet, it saves space. If it is
159 # a glob, we must still create it this way to get the
160 # right internal flags set, as constants are distinct
161 # from subroutines created with sub(){...}.
162 # The check in Perl_ck_rvconst knows that inlinable
163 # constants from cv_const_sv are read only. So we have to:
1642262µs2218µs Internals::SvREADONLY($scalar, 1);
# spent 18µs making 22 calls to Internals::SvREADONLY, avg 805ns/call
1652214µs if (!exists $symtab->{$name}) {
166199µs $symtab->{$name} = \$scalar;
1671914µs ++$flush_mro->{$pkg};
168 }
169 else {
17033µs local $constant::{_dummy} = \$scalar;
171315µs *$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.
1972290µs if (_CAN_PCS && $flush_mro) {
1981984µs1921µs mro::method_changed_in($_) for keys %$flush_mro;
# spent 21µs making 19 calls to mro::method_changed_in, avg 1µs/call
199 }
200}
201
20218µs1;
203
204__END__
 
# spent 44µs within constant::CORE:match which was called 22 times, avg 2µs/call: # 22 times (44µs+0s) by constant::import at line 99, avg 2µs/call
sub constant::CORE:match; # opcode
# spent 3µs within constant::CORE:qr which was called 3 times, avg 1µs/call: # once (2µs+0s) by File::Spec::Unix::BEGIN@130 at line 20 # once (700ns+0s) by File::Spec::Unix::BEGIN@130 at line 22 # once (600ns+0s) by File::Spec::Unix::BEGIN@130 at line 21
sub constant::CORE:qr; # opcode
# spent 38µs within constant::CORE:regcomp which was called 22 times, avg 2µs/call: # 22 times (38µs+0s) by constant::import at line 99, avg 2µs/call
sub constant::CORE:regcomp; # opcode
# spent 47µs within constant::CORE:subst which was called 22 times, avg 2µs/call: # 22 times (47µs+0s) by constant::import at line 87, avg 2µs/call
sub constant::CORE:subst; # opcode