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For ../dm5dm6_ex3
  Run on Tue Feb 24 07:41:47 2015
Reported on Tue Feb 24 07:41:51 2015

Filename/usr/lib/perl5/5.20.1/constant.pm
StatementsExecuted 80 statements in 897µs
Subroutines
Calls P F Exclusive
Time
Inclusive
Time
Subroutine
22231µs40µsconstant::::importconstant::import
1119µs10µsconstant::::BEGIN@24constant::BEGIN@24
1118µs8µsconstant::::BEGIN@2constant::BEGIN@2
1114µs11µsconstant::::BEGIN@39constant::BEGIN@39
1114µs10µsconstant::::BEGIN@126constant::BEGIN@126
1114µs58µsconstant::::BEGIN@4constant::BEGIN@4
2114µs4µsconstant::::CORE:regcompconstant::CORE:regcomp (opcode)
1114µs20µsconstant::::BEGIN@6constant::BEGIN@6
1114µs9µsconstant::::BEGIN@64constant::BEGIN@64
2113µs3µsconstant::::CORE:matchconstant::CORE:match (opcode)
1113µs17µsconstant::::BEGIN@3constant::BEGIN@3
3312µs2µsconstant::::CORE:qrconstant::CORE:qr (opcode)
0000s0sconstant::::__ANON__[:159]constant::__ANON__[:159]
0000s0sconstant::::__ANON__[:175]constant::__ANON__[:175]
0000s0sconstant::::__ANON__[:177]constant::__ANON__[:177]
0000s0sconstant::::__ANON__[:40]constant::__ANON__[:40]
0000s0sconstant::::__ANON__[:41]constant::__ANON__[:41]
0000s0sconstant::::__ANON__[:42]constant::__ANON__[:42]
Call graph for these subroutines as a Graphviz dot language file.
Line State
ments
Time
on line
Calls Time
in subs
Code
1package constant;
2223µs18µs
# spent 8µs within constant::BEGIN@2 which was called: # once (8µs+0s) by Encode::BEGIN@8 at line 2
use 5.008;
# spent 8µs making 1 call to constant::BEGIN@2
3212µs232µs
# spent 17µs (3+14) within constant::BEGIN@3 which was called: # once (3µs+14µs) by Encode::BEGIN@8 at line 3
use strict;
# spent 17µs making 1 call to constant::BEGIN@3 # spent 14µs making 1 call to strict::import
4216µs2112µs
# spent 58µs (4+54) within constant::BEGIN@4 which was called: # once (4µs+54µs) by Encode::BEGIN@8 at line 4
use warnings::register;
# spent 58µs making 1 call to constant::BEGIN@4 # spent 54µs making 1 call to warnings::register::import
5
62314µs237µs
# spent 20µs (4+17) within constant::BEGIN@6 which was called: # once (4µs+17µs) by Encode::BEGIN@8 at line 6
use vars qw($VERSION %declared);
# spent 20µs making 1 call to constant::BEGIN@6 # spent 17µs making 1 call to vars::import
71300ns$VERSION = '1.31';
8
9#=======================================================================
10
11# Some names are evil choices.
1213µsmy %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD };
131800ns$keywords{UNITCHECK}++ if $] > 5.009;
14
1513µsmy %forced_into_main = map +($_, 1),
16 qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG };
17
1813µsmy %forbidden = (%keywords, %forced_into_main);
19
2015µs12µsmy $normal_constant_name = qr/^_?[^\W_0-9]\w*\z/;
# spent 2µs making 1 call to constant::CORE:qr
2112µs1500nsmy $tolerable = qr/^[A-Za-z_]\w*\z/;
# spent 500ns making 1 call to constant::CORE:qr
2211µs1200nsmy $boolean = qr/^[01]?\z/;
# spent 200ns making 1 call to constant::CORE:qr
23
24
# spent 10µs (9+600ns) within constant::BEGIN@24 which was called: # once (9µs+600ns) by Encode::BEGIN@8 at line 44
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 1 run time check for *every* call to import.
281700ns my $const = $] > 5.009002;
291300ns my $downgrade = $] < 5.015004; # && $] >= 5.008
301300ns my $constarray = exists &_make_const;
3112µs if ($const) {
3214µs1500ns Internals::SvREADONLY($const, 1);
# spent 500ns making 1 call to Internals::SvREADONLY
3311µs1100ns Internals::SvREADONLY($downgrade, 1);
# spent 100ns making 1 call to Internals::SvREADONLY
341800ns $constant::{_CAN_PCS} = \$const;
351100ns $constant::{_DOWNGRADE} = \$downgrade;
361400ns $constant::{_CAN_PCS_FOR_ARRAY} = \$constarray;
37 }
38 else {
39247µs218µs
# spent 11µs (4+6) within constant::BEGIN@39 which was called: # once (4µs+6µs) by Encode::BEGIN@8 at line 39
no strict 'refs';
# spent 11µs making 1 call to constant::BEGIN@39 # spent 6µs making 1 call to strict::unimport
40 *{"_CAN_PCS"} = sub () {$const};
41 *{"_DOWNGRADE"} = sub () { $downgrade };
42 *{"_CAN_PCS_FOR_ARRAY"} = sub () { $constarray };
43 }
44142µs110µs}
# spent 10µs making 1 call to constant::BEGIN@24
45
46#=======================================================================
47# import() - import symbols into user's namespace
48#
49# What we actually do is define a function in the caller's namespace
50# which returns the value. The function we create will normally
51# be inlined as a constant, thereby avoiding further sub calling
52# overhead.
53#=======================================================================
54
# spent 40µs (31+9) within constant::import which was called 2 times, avg 20µs/call: # once (18µs+6µs) by Encode::BEGIN@8 at line 8 of Encode.pm # once (14µs+4µs) by Encode::Alias::BEGIN@6 at line 6 of Encode/Alias.pm
sub import {
552500ns my $class = shift;
562300ns return unless @_; # Ignore 'use constant;'
572200ns my $constants;
582700ns my $multiple = ref $_[0];
592700ns my $pkg = caller;
602200ns my $flush_mro;
61 my $symtab;
62
632600ns if (_CAN_PCS) {
642143µs214µs
# spent 9µs (4+5) within constant::BEGIN@64 which was called: # once (4µs+5µs) by Encode::BEGIN@8 at line 64
no strict 'refs';
# spent 9µs making 1 call to constant::BEGIN@64 # spent 5µs making 1 call to strict::unimport
6522µs $symtab = \%{$pkg . '::'};
66 };
67
682500ns if ( $multiple ) {
69 if (ref $_[0] ne 'HASH') {
70 require Carp;
71 Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'");
72 }
73 $constants = shift;
74 } else {
752300ns unless (defined $_[0]) {
76 require Carp;
77 Carp::croak("Can't use undef as constant name");
78 }
7921µs $constants->{+shift} = undef;
80 }
81
8222µs foreach my $name ( keys %$constants ) {
83 # Normal constant name
84214µs47µs if ($name =~ $normal_constant_name and !$forbidden{$name}) {
# spent 4µs making 2 calls to constant::CORE:regcomp, avg 2µs/call # spent 3µs making 2 calls to constant::CORE:match, avg 2µs/call
85 # Everything is okay
86
87 # Name forced into main, but we're not in main. Fatal.
88 } elsif ($forced_into_main{$name} and $pkg ne 'main') {
89 require Carp;
90 Carp::croak("Constant name '$name' is forced into main::");
91
92 # Starts with double underscore. Fatal.
93 } elsif ($name =~ /^__/) {
94 require Carp;
95 Carp::croak("Constant name '$name' begins with '__'");
96
97 # Maybe the name is tolerable
98 } elsif ($name =~ $tolerable) {
99 # Then we'll warn only if you've asked for warnings
100 if (warnings::enabled()) {
101 if ($keywords{$name}) {
102 warnings::warn("Constant name '$name' is a Perl keyword");
103 } elsif ($forced_into_main{$name}) {
104 warnings::warn("Constant name '$name' is " .
105 "forced into package main::");
106 }
107 }
108
109 # Looks like a boolean
110 # use constant FRED == fred;
111 } elsif ($name =~ $boolean) {
112 require Carp;
113 if (@_) {
114 Carp::croak("Constant name '$name' is invalid");
115 } else {
116 Carp::croak("Constant name looks like boolean value");
117 }
118
119 } else {
120 # Must have bad characters
121 require Carp;
122 Carp::croak("Constant name '$name' has invalid characters");
123 }
124
125 {
1264230µs216µs
# spent 10µs (4+6) within constant::BEGIN@126 which was called: # once (4µs+6µs) by Encode::BEGIN@8 at line 126
no strict 'refs';
# spent 10µs making 1 call to constant::BEGIN@126 # spent 6µs making 1 call to strict::unimport
1272900ns my $full_name = "${pkg}::$name";
1282800ns $declared{$full_name}++;
1292900ns if ($multiple || @_ == 1) {
1302500ns my $scalar = $multiple ? $constants->{$name} : $_[0];
131
132 if (_DOWNGRADE) { # for 5.8 to 5.14
133 # Work around perl bug #31991: Sub names (actually glob
134 # names in general) ignore the UTF8 flag. So we have to
135 # turn it off to get the "right" symbol table entry.
136 utf8::is_utf8 $name and utf8::encode $name;
137 }
138
139 # The constant serves to optimise this entire block out on
140 # 5.8 and earlier.
1412400ns if (_CAN_PCS) {
142 # Use a reference as a proxy for a constant subroutine.
143 # If this is not a glob yet, it saves space. If it is
144 # a glob, we must still create it this way to get the
145 # right internal flags set, as constants are distinct
146 # from subroutines created with sub(){...}.
147 # The check in Perl_ck_rvconst knows that inlinable
148 # constants from cv_const_sv are read only. So we have to:
14924µs2800ns Internals::SvREADONLY($scalar, 1);
# spent 800ns making 2 calls to Internals::SvREADONLY, avg 400ns/call
1502900ns if ($symtab && !exists $symtab->{$name}) {
1512700ns $symtab->{$name} = \$scalar;
1522300ns ++$flush_mro;
153 }
154 else {
155 local $constant::{_dummy} = \$scalar;
156 *$full_name = \&{"_dummy"};
157 }
158 } else {
159 *$full_name = sub () { $scalar };
160 }
161 } elsif (@_) {
162 my @list = @_;
163 if (_CAN_PCS_FOR_ARRAY) {
164 _make_const($list[$_]) for 0..$#list;
165 _make_const(@list);
166 if ($symtab && !exists $symtab->{$name}) {
167 $symtab->{$name} = \@list;
168 $flush_mro++;
169 }
170 else {
171 local $constant::{_dummy} = \@list;
172 *$full_name = \&{"_dummy"};
173 }
174 }
175 else { *$full_name = sub () { @list }; }
176 } else {
177 *$full_name = sub () { };
178 }
179 }
180 }
181 # Flush the cache exactly once if we make any direct symbol table changes.
18229µs21µs mro::method_changed_in($pkg) if _CAN_PCS && $flush_mro;
# spent 1µs making 2 calls to mro::method_changed_in, avg 700ns/call
183}
184
18514µs1;
186
187__END__
 
# spent 3µs within constant::CORE:match which was called 2 times, avg 2µs/call: # 2 times (3µs+0s) by constant::import at line 84, avg 2µs/call
sub constant::CORE:match; # opcode
# spent 2µs within constant::CORE:qr which was called 3 times, avg 767ns/call: # once (2µs+0s) by Encode::BEGIN@8 at line 20 # once (500ns+0s) by Encode::BEGIN@8 at line 21 # once (200ns+0s) by Encode::BEGIN@8 at line 22
sub constant::CORE:qr; # opcode
# spent 4µs within constant::CORE:regcomp which was called 2 times, avg 2µs/call: # 2 times (4µs+0s) by constant::import at line 84, avg 2µs/call
sub constant::CORE:regcomp; # opcode