Profile of Exporter.pm

Filename	/home/lbr/.plenv/versions/5.20.2/lib/perl5/5.20.2/Exporter.pm
Statements	Executed 47 statements in 123µs

Subroutines
Calls	P	F	Exclusive Time	Inclusive Time	Subroutine
4	4	3	86µs	100µs	Exporter::::importExporter::import
5	2	1	14µs	14µs	Exporter::::CORE:matchExporter::CORE:match (opcode)
0	0	0	0s	0s	Exporter::::__ANON__[:64]Exporter::__ANON__[:64]
0	0	0	0s	0s	Exporter::::as_heavyExporter::as_heavy
0	0	0	0s	0s	Exporter::::exportExporter::export
0	0	0	0s	0s	Exporter::::export_failExporter::export_fail
0	0	0	0s	0s	Exporter::::export_ok_tagsExporter::export_ok_tags
0	0	0	0s	0s	Exporter::::export_tagsExporter::export_tags
0	0	0	0s	0s	Exporter::::export_to_levelExporter::export_to_level
0	0	0	0s	0s	Exporter::::require_versionExporter::require_version

Call graph for these subroutines as a Graphviz dot language file.

Line	State ments	Time on line	Calls	Time in subs	Code
1					package Exporter;
2
3	1	11µs			require 5.006;
4
5					# Be lean.
6					#use strict;
7					#no strict 'refs';
8
9	1	500ns			our $Debug = 0;
10	1	300ns			our $ExportLevel = 0;
11	1	300ns			our $Verbose \|\|= 0;
12	1	400ns			our $VERSION = '5.71';
13	1	400ns			our (%Cache);
14
15					sub as_heavy {
16					require Exporter::Heavy;
17					# Unfortunately, this does not work if the caller is aliased as *name = \&foo
18					# Thus the need to create a lot of identical subroutines
19					my $c = (caller(1))[3];
20					$c =~ s/.*:://;
21					\&{"Exporter::Heavy::heavy_$c"};
22					}
23
24					sub export {
25					goto &{as_heavy()};
26					}
27
28					# spent 100µs (86+14) within Exporter::import which was called 4 times, avg 25µs/call: # once (43µs+13µs) by Petal::Tiny::BEGIN@5 at line 5 of lib/Petal/Tiny.pm # once (31µs+1µs) by Encode::BEGIN@47 at line 47 of Encode.pm # once (7µs+0s) by Encode::BEGIN@12 at line 12 of Encode.pm # once (5µs+0s) by Encode::Alias::BEGIN@8 at line 8 of Encode/Alias.pm sub import {
29	4	2µs			my $pkg = shift;
30	4	3µs			my $callpkg = caller($ExportLevel);
31
32	4	3µs			if ($pkg eq "Exporter" and @_ and $_[0] eq "import") {
33	2	5µs			*{$callpkg."::import"} = \&import;
34	2	5µs			return;
35					}
36
37					# We need to treat @{"$pkg\::EXPORT_FAIL"} since Carp uses it :-(
38	2	4µs			my $exports = \@{"$pkg\::EXPORT"};
39					# But, avoid creating things if they don't exist, which saves a couple of
40					# hundred bytes per package processed.
41	2	4µs			my $fail = ${$pkg . '::'}{EXPORT_FAIL} && \@{"$pkg\::EXPORT_FAIL"};
42	2	1µs			return export $pkg, $callpkg, @_
43					if $Verbose or $Debug or $fail && @$fail > 1;
44	2	3µs			my $export_cache = ($Cache{$pkg} \|\|= {});
45	2	3µs			my $args = @_ or @_ = @$exports;
46
47	2	700ns			if ($args and not %$export_cache) {
48					s/^&//, $export_cache->{$_} = 1
49					foreach (@$exports, @{"$pkg\::EXPORT_OK"});
50					}
51	2	600ns			my $heavy;
52					# Try very hard not to use {} and hence have to enter scope on the foreach
53					# We bomb out of the loop with last as soon as heavy is set.
54	2	2µs			if ($args or $fail) {
55					($heavy = (/\W/ or $args and not exists $export_cache->{$_}
56					or $fail and @$fail and $_ eq $fail->[0])) and last
57	1	29µs	3	13µs	foreach (@_); # spent 13µs making 3 calls to Exporter::CORE:match, avg 4µs/call
58					} else {
59					($heavy = /\W/) and last
60	1	6µs	2	1µs	foreach (@_); # spent 1µs making 2 calls to Exporter::CORE:match, avg 600ns/call
61					}
62	2	300ns			return export $pkg, $callpkg, ($args ? @_ : ()) if $heavy;
63					local $SIG{__WARN__} =
64	2	10µs			sub {require Carp; &Carp::carp} if not $SIG{__WARN__};
65					# shortcut for the common case of no type character
66	2	24µs			*{"$callpkg\::$_"} = \&{"$pkg\::$_"} foreach @_;
67					}
68
69					# Default methods
70
71					sub export_fail {
72					my $self = shift;
73					@_;
74					}
75
76					# Unfortunately, caller(1)[3] "does not work" if the caller is aliased as
77					# *name = \&foo. Thus the need to create a lot of identical subroutines
78					# Otherwise we could have aliased them to export().
79
80					sub export_to_level {
81					goto &{as_heavy()};
82					}
83
84					sub export_tags {
85					goto &{as_heavy()};
86					}
87
88					sub export_ok_tags {
89					goto &{as_heavy()};
90					}
91
92					sub require_version {
93					goto &{as_heavy()};
94					}
95
96	1	5µs			1;
97					__END__

					# spent 14µs within Exporter::CORE:match which was called 5 times, avg 3µs/call: # 3 times (13µs+0s) by Exporter::import at line 57, avg 4µs/call # 2 times (1µs+0s) by Exporter::import at line 60, avg 600ns/call sub Exporter::CORE:match; # opcode