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For v6.pl
  Run on Fri Jan 3 17:38:25 2020
Reported on Fri Jan 3 17:38:42 2020

Filename/usr/share/perl/5.26/constant.pm
StatementsExecuted 62 statements in 697µs
Subroutines
Calls P F Exclusive
Time		 Inclusive
Time		 Subroutine
11196µs154µsconstant::::BEGIN@4constant::BEGIN@4
11115µs20µsconstant::::importconstant::import
1119µs9µsconstant::::BEGIN@2constant::BEGIN@2
1116µs7µsconstant::::BEGIN@24constant::BEGIN@24
1114µs8µsconstant::::BEGIN@40constant::BEGIN@40
1113µs8µsconstant::::BEGIN@141constant::BEGIN@141
1113µs7µsconstant::::BEGIN@90constant::BEGIN@90
1113µs4µsconstant::::BEGIN@3constant::BEGIN@3
1113µs7µsconstant::::BEGIN@65constant::BEGIN@65
3312µs2µsconstant::::CORE:qrconstant::CORE:qr (opcode)
1112µs2µsconstant::::CORE:regcompconstant::CORE:regcomp (opcode)
1111µs1µsconstant::::CORE:matchconstant::CORE:match (opcode)
1111µs1µsconstant::::CORE:substconstant::CORE:subst (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;
2220µs19µs
# spent 9µs within constant::BEGIN@2 which was called: # once (9µs+0s) by Data::Dumper::BEGIN@277 at line 2
use 5.008;
# spent 9µs making 1 call to constant::BEGIN@2
3210µs26µs
# spent 4µs (3+1) within constant::BEGIN@3 which was called: # once (3µs+1µs) by Data::Dumper::BEGIN@277 at line 3
use strict;
# spent 4µs making 1 call to constant::BEGIN@3 # spent 1µs making 1 call to strict::import
42208µs2213µs
# spent 154µs (96+59) within constant::BEGIN@4 which was called: # once (96µs+59µs) by Data::Dumper::BEGIN@277 at line 4
use warnings::register;
# spent 154µs making 1 call to constant::BEGIN@4 # spent 59µs making 1 call to warnings::register::import
5
61200nsour $VERSION = '1.33';
7our %declared;
8
9#=======================================================================
10
11# Some names are evil choices.
1212µsmy %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD };
131600ns$keywords{UNITCHECK}++ if $] > 5.009;
14
1512µsmy %forced_into_main = map +($_, 1),
16 qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG };
17
1812µsmy %forbidden = (%keywords, %forced_into_main);
19
2014µs11µsmy $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/;
# spent 1µs making 1 call to constant::CORE:qr
2111µs1300nsmy $tolerable = qr/^[A-Za-z_]\w*\z/;
# spent 300ns making 1 call to constant::CORE:qr
2212µs1900nsmy $boolean = qr/^[01]?\z/;
# spent 900ns making 1 call to constant::CORE:qr
23
24
# spent 7µs (6+600ns) within constant::BEGIN@24 which was called: # once (6µs+600ns) by Data::Dumper::BEGIN@277 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.
291500ns my $const = $] > 5.009002;
301200ns my $downgrade = $] < 5.015004; # && $] >= 5.008
311200ns my $constarray = exists &_make_const;
3211µs if ($const) {
3313µs1500ns Internals::SvREADONLY($const, 1);
# spent 500ns making 1 call to Internals::SvREADONLY
341800ns1100ns Internals::SvREADONLY($downgrade, 1);
# spent 100ns making 1 call to Internals::SvREADONLY
351600ns $constant::{_CAN_PCS} = \$const;
361200ns $constant::{_DOWNGRADE} = \$downgrade;
371200ns $constant::{_CAN_PCS_FOR_ARRAY} = \$constarray;
38 }
39 else {
40238µs214µs
# spent 8µs (4+5) within constant::BEGIN@40 which was called: # once (4µs+5µs) by Data::Dumper::BEGIN@277 at line 40
no strict 'refs';
# spent 8µs making 1 call to constant::BEGIN@40 # spent 5µs making 1 call to strict::unimport
41 *{"_CAN_PCS"} = sub () {$const};
42 *{"_DOWNGRADE"} = sub () { $downgrade };
43 *{"_CAN_PCS_FOR_ARRAY"} = sub () { $constarray };
44 }
45134µs17µs}
# spent 7µs 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 20µs (15+5) within constant::import which was called: # once (15µs+5µs) by Data::Dumper::BEGIN@277 at line 277 of Data/Dumper.pm
sub import {
561200ns my $class = shift;
571200ns return unless @_; # Ignore 'use constant;'
5810s my $constants;
591200ns my $multiple = ref $_[0];
601300ns my $caller = caller;
611100ns my $flush_mro;
62 my $symtab;
63
641100ns if (_CAN_PCS) {
65267µs211µs
# spent 7µs (3+4) within constant::BEGIN@65 which was called: # once (3µs+4µs) by Data::Dumper::BEGIN@277 at line 65
no strict 'refs';
# spent 7µs making 1 call to constant::BEGIN@65 # spent 4µs making 1 call to strict::unimport
661800ns $symtab = \%{$caller . '::'};
67 };
68
691200ns 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 {
761100ns unless (defined $_[0]) {
77 require Carp;
78 Carp::croak("Can't use undef as constant name");
79 }
801500ns $constants->{+shift} = undef;
81 }
82
831600ns foreach my $name ( keys %$constants ) {
8410s my $pkg;
8510s my $symtab = $symtab;
861100ns my $orig_name = $name;
8713µs11µs if ($name =~ s/(.*)(?:::|')(?=.)//s) {
# spent 1µs making 1 call to constant::CORE:subst
88 $pkg = $1;
89 if (_CAN_PCS && $pkg ne $caller) {
90296µs211µs
# spent 7µs (3+4) within constant::BEGIN@90 which was called: # once (3µs+4µs) by Data::Dumper::BEGIN@277 at line 90
no strict 'refs';
# spent 7µs making 1 call to constant::BEGIN@90 # spent 4µs making 1 call to strict::unimport
91 $symtab = \%{$pkg . '::'};
92 }
93 }
94 else {
951100ns $pkg = $caller;
96 }
97
98 # Normal constant name
9916µs23µs if ($name =~ $normal_constant_name and !$forbidden{$name}) {
# spent 2µs making 1 call to constant::CORE:regcomp # spent 1µs making 1 call to constant::CORE:match
100 # Everything is okay
101
102 # Name forced into main, but we're not in main. Fatal.
103 } elsif ($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 {
1413179µs212µs
# spent 8µs (3+4) within constant::BEGIN@141 which was called: # once (3µs+4µs) by Data::Dumper::BEGIN@277 at line 141
no strict 'refs';
# spent 8µs making 1 call to constant::BEGIN@141 # spent 4µs making 1 call to strict::unimport
1421400ns my $full_name = "${pkg}::$name";
1431400ns $declared{$full_name}++;
1441500ns if ($multiple || @_ == 1) {
1451200ns 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 $name;
152 }
153
154 # The constant serves to optimise this entire block out on
155 # 5.8 and earlier.
1561200ns if (_CAN_PCS) {
157 # Use a reference as a proxy for a constant subroutine.
158 # If this is not a glob yet, it saves space. If it is
159 # a glob, we must still create it this way to get the
160 # right internal flags set, as constants are distinct
161 # from subroutines created with sub(){...}.
162 # The check in Perl_ck_rvconst knows that inlinable
163 # constants from cv_const_sv are read only. So we have to:
16411µs1300ns Internals::SvREADONLY($scalar, 1);
# spent 300ns making 1 call to Internals::SvREADONLY
1651300ns if (!exists $symtab->{$name}) {
1661200ns $symtab->{$name} = \$scalar;
1671200ns ++$flush_mro->{$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.
19712µs if (_CAN_PCS && $flush_mro) {
19812µs1400ns mro::method_changed_in($_) for keys %$flush_mro;
# spent 400ns making 1 call to mro::method_changed_in
199 }
200}
201
20215µs1;
203
204__END__
 
# spent 1µs within constant::CORE:match which was called: # once (1µs+0s) by constant::import at line 99
sub constant::CORE:match; # opcode
# spent 2µs within constant::CORE:qr which was called 3 times, avg 800ns/call: # once (1µs+0s) by Data::Dumper::BEGIN@277 at line 20 # once (900ns+0s) by Data::Dumper::BEGIN@277 at line 22 # once (300ns+0s) by Data::Dumper::BEGIN@277 at line 21
sub constant::CORE:qr; # opcode
# spent 2µs within constant::CORE:regcomp which was called: # once (2µs+0s) by constant::import at line 99
sub constant::CORE:regcomp; # opcode
# spent 1µs within constant::CORE:subst which was called: # once (1µs+0s) by constant::import at line 87
sub constant::CORE:subst; # opcode
Report produced by the NYTProf 6.04 Perl profiler, developed by Tim Bunce based on work by Adam Kaplan and Salvador Fandiño García.