← Index
NYTProf Performance Profile   « line view »
For ./v1.pl
  Run on Wed Sep 18 20:26:04 2019
Reported on Wed Sep 18 20:29:11 2019

Filename/usr/share/perl/5.26/constant.pm
StatementsExecuted 62 statements in 1.81ms
Subroutines
Calls P F Exclusive
Time		 Inclusive
Time		 Subroutine
111297µs411µsconstant::::BEGIN@4constant::BEGIN@4
11137µs49µsconstant::::importconstant::import
11122µs22µsconstant::::BEGIN@2constant::BEGIN@2
11116µs18µsconstant::::BEGIN@24constant::BEGIN@24
1119µs13µsconstant::::BEGIN@3constant::BEGIN@3
1118µs19µsconstant::::BEGIN@90constant::BEGIN@90
1118µs21µsconstant::::BEGIN@40constant::BEGIN@40
1117µs17µsconstant::::BEGIN@141constant::BEGIN@141
3316µs6µsconstant::::CORE:qrconstant::CORE:qr (opcode)
1116µs16µsconstant::::BEGIN@65constant::BEGIN@65
1115µs5µsconstant::::CORE:regcompconstant::CORE:regcomp (opcode)
1113µs3µsconstant::::CORE:matchconstant::CORE:match (opcode)
1113µs3µsconstant::::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;
2262µs122µs
# spent 22µs within constant::BEGIN@2 which was called: # once (22µs+0s) by Data::Dumper::BEGIN@277 at line 2
use 5.008;
# spent 22µs making 1 call to constant::BEGIN@2
3230µs218µs
# spent 13µs (9+4) within constant::BEGIN@3 which was called: # once (9µs+4µs) by Data::Dumper::BEGIN@277 at line 3
use strict;
# spent 13µs making 1 call to constant::BEGIN@3 # spent 4µs making 1 call to strict::import
42609µs2525µs
# spent 411µs (297+114) within constant::BEGIN@4 which was called: # once (297µs+114µs) by Data::Dumper::BEGIN@277 at line 4
use warnings::register;
# spent 411µs making 1 call to constant::BEGIN@4 # spent 114µs making 1 call to warnings::register::import
5
61600nsour $VERSION = '1.33';
7our %declared;
8
9#=======================================================================
10
11# Some names are evil choices.
1215µsmy %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD };
1312µs$keywords{UNITCHECK}++ if $] > 5.009;
14
1515µsmy %forced_into_main = map +($_, 1),
16 qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG };
17
1816µsmy %forbidden = (%keywords, %forced_into_main);
19
2019µs13µsmy $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/;
# spent 3µs making 1 call to constant::CORE:qr
2113µs1800nsmy $tolerable = qr/^[A-Za-z_]\w*\z/;
# spent 800ns making 1 call to constant::CORE:qr
2214µs12µsmy $boolean = qr/^[01]?\z/;
# spent 2µs making 1 call to constant::CORE:qr
23
24
# spent 18µs (16+1) within constant::BEGIN@24 which was called: # once (16µs+1µs) 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.
2911µs my $const = $] > 5.009002;
301500ns my $downgrade = $] < 5.015004; # && $] >= 5.008
311500ns my $constarray = exists &_make_const;
3213µs if ($const) {
3316µs11µs Internals::SvREADONLY($const, 1);
# spent 1µs making 1 call to Internals::SvREADONLY
3412µs1300ns Internals::SvREADONLY($downgrade, 1);
# spent 300ns making 1 call to Internals::SvREADONLY
3512µs $constant::{_CAN_PCS} = \$const;
361400ns $constant::{_DOWNGRADE} = \$downgrade;
371600ns $constant::{_CAN_PCS_FOR_ARRAY} = \$constarray;
38 }
39 else {
40294µs234µs
# spent 21µs (8+13) within constant::BEGIN@40 which was called: # once (8µs+13µs) by Data::Dumper::BEGIN@277 at line 40
no strict 'refs';
# spent 21µs making 1 call to constant::BEGIN@40 # spent 13µs making 1 call to strict::unimport
41 *{"_CAN_PCS"} = sub () {$const};
42 *{"_DOWNGRADE"} = sub () { $downgrade };
43 *{"_CAN_PCS_FOR_ARRAY"} = sub () { $constarray };
44 }
45180µs118µs}
# spent 18µs 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 49µs (37+12) within constant::import which was called: # once (37µs+12µs) by Data::Dumper::BEGIN@277 at line 277 of Data/Dumper.pm
sub import {
561500ns my $class = shift;
571500ns return unless @_; # Ignore 'use constant;'
581100ns my $constants;
591600ns my $multiple = ref $_[0];
601600ns my $caller = caller;
611200ns my $flush_mro;
62 my $symtab;
63
641300ns if (_CAN_PCS) {
652186µs226µs
# spent 16µs (6+10) within constant::BEGIN@65 which was called: # once (6µs+10µs) by Data::Dumper::BEGIN@277 at line 65
no strict 'refs';
# spent 16µs making 1 call to constant::BEGIN@65 # spent 10µs making 1 call to strict::unimport
6612µs $symtab = \%{$caller . '::'};
67 };
68
691300ns 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 {
761200ns unless (defined $_[0]) {
77 require Carp;
78 Carp::croak("Can't use undef as constant name");
79 }
8011µs $constants->{+shift} = undef;
81 }
82
8312µs foreach my $name ( keys %$constants ) {
841200ns my $pkg;
851300ns my $symtab = $symtab;
861200ns my $orig_name = $name;
8716µs13µs if ($name =~ s/(.*)(?:::|')(?=.)//s) {
# spent 3µs making 1 call to constant::CORE:subst
88 $pkg = $1;
89 if (_CAN_PCS && $pkg ne $caller) {
902222µs229µs
# spent 19µs (8+10) within constant::BEGIN@90 which was called: # once (8µs+10µs) by Data::Dumper::BEGIN@277 at line 90
no strict 'refs';
# spent 19µs making 1 call to constant::BEGIN@90 # spent 10µs making 1 call to strict::unimport
91 $symtab = \%{$pkg . '::'};
92 }
93 }
94 else {
951300ns $pkg = $caller;
96 }
97
98 # Normal constant name
99115µs28µs if ($name =~ $normal_constant_name and !$forbidden{$name}) {
# spent 5µs making 1 call to constant::CORE:regcomp # spent 3µs making 1 call to constant::CORE:match
100 # Everything is okay
101
102 # Name forced into main, but we're not in main. Fatal.
103 } elsif ($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 {
1413413µs227µs
# spent 17µs (7+10) within constant::BEGIN@141 which was called: # once (7µs+10µs) by Data::Dumper::BEGIN@277 at line 141
no strict 'refs';
# spent 17µs making 1 call to constant::BEGIN@141 # spent 10µs making 1 call to strict::unimport
14211µs my $full_name = "${pkg}::$name";
1431800ns $declared{$full_name}++;
14411µs if ($multiple || @_ == 1) {
1451500ns 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 $name;
152 }
153
154 # The constant serves to optimise this entire block out on
155 # 5.8 and earlier.
1561300ns if (_CAN_PCS) {
157 # Use a reference as a proxy for a constant subroutine.
158 # If this is not a glob yet, it saves space. If it is
159 # a glob, we must still create it this way to get the
160 # right internal flags set, as constants are distinct
161 # from subroutines created with sub(){...}.
162 # The check in Perl_ck_rvconst knows that inlinable
163 # constants from cv_const_sv are read only. So we have to:
16413µs1900ns Internals::SvREADONLY($scalar, 1);
# spent 900ns making 1 call to Internals::SvREADONLY
16511µs if (!exists $symtab->{$name}) {
1661500ns $symtab->{$name} = \$scalar;
1671700ns ++$flush_mro->{$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.
19714µs if (_CAN_PCS && $flush_mro) {
19816µs11µs mro::method_changed_in($_) for keys %$flush_mro;
# spent 1µs making 1 call to mro::method_changed_in
199 }
200}
201
202110µs1;
203
204__END__
 
# spent 3µs within constant::CORE:match which was called: # once (3µs+0s) by constant::import at line 99
sub constant::CORE:match; # opcode
# spent 6µs within constant::CORE:qr which was called 3 times, avg 2µs/call: # once (3µs+0s) by Data::Dumper::BEGIN@277 at line 20 # once (2µs+0s) by Data::Dumper::BEGIN@277 at line 22 # once (800ns+0s) by Data::Dumper::BEGIN@277 at line 21
sub constant::CORE:qr; # opcode
# spent 5µs within constant::CORE:regcomp which was called: # once (5µs+0s) by constant::import at line 99
sub constant::CORE:regcomp; # opcode
# spent 3µs within constant::CORE:subst which was called: # once (3µs+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.