Profile of Exporter/Heavy.pm

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For scripts/bench.pl
Run on Mon Oct 22 16:48:56 2018
Reported on Mon Oct 22 16:49:10 2018

Filename | /usr/share/perl/5.26/Exporter/Heavy.pm
Statements | Executed 43 statements in 2.30ms

Subroutines
Calls | P | F | Exclusive Time | Inclusive Time | Subroutine
--- | --- | --- | --- | --- | ---
1 | 1 | 1 | 86µs | 91µs | Exporter::Heavy::::_rebuild_cacheExporter::Heavy::_rebuild_cache
1 | 1 | 1 | 60µs | 154µs | Exporter::Heavy::::heavy_exportExporter::Heavy::heavy_export
1 | 1 | 1 | 20µs | 24µs | Exporter::Heavy::::BEGIN@3Exporter::Heavy::BEGIN@3
1 | 1 | 1 | 17µs | 34µs | Exporter::Heavy::::BEGIN@188Exporter::Heavy::BEGIN@188
1 | 1 | 1 | 13µs | 179µs | Exporter::Heavy::::heavy_export_to_levelExporter::Heavy::heavy_export_to_level
1 | 1 | 1 | 8µs | 23µs | Exporter::Heavy::::BEGIN@4Exporter::Heavy::BEGIN@4
51 | 2 | 1 | 7µs | 7µs | Exporter::Heavy::::CORE:substExporter::Heavy::CORE:subst (opcode)
2 | 1 | 1 | 1µs | 1µs | Exporter::Heavy::::CORE:matchExporter::Heavy::CORE:match (opcode)
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::__ANON__[:43]Exporter::Heavy::__ANON__[:43]
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::__ANON__[:49]Exporter::Heavy::__ANON__[:49]
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::_push_tagsExporter::Heavy::_push_tags
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::heavy_export_ok_tagsExporter::Heavy::heavy_export_ok_tags
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::heavy_export_tagsExporter::Heavy::heavy_export_tags
0 | 0 | 0 | 0s | 0s | Exporter::Heavy::::heavy_require_versionExporter::Heavy::heavy_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::Heavy;
2 |  |  |  |  |
3 | 2 | 43µs | 2 | 27µs | # spent 24µs (20+4) within Exporter::Heavy::BEGIN@3 which was called: # once (20µs+4µs) by Exporter::as_heavy at line 3 use strict; # spent 24µs making 1 call to Exporter::Heavy::BEGIN@3 # spent 4µs making 1 call to strict::import
4 | 2 | 1.48ms | 2 | 38µs | # spent 23µs (8+15) within Exporter::Heavy::BEGIN@4 which was called: # once (8µs+15µs) by Exporter::as_heavy at line 4 no strict 'refs'; # spent 23µs making 1 call to Exporter::Heavy::BEGIN@4 # spent 15µs making 1 call to strict::unimport
5 |  |  |  |  |
6 |  |  |  |  | # On one line so MakeMaker will see it.
7 | 2 | 1µs |  |  | require Exporter; our $VERSION = $Exporter::VERSION;
8 |  |  |  |  |
9 |  |  |  |  | #
10 |  |  |  |  | # We go to a lot of trouble not to 'require Carp' at file scope,
11 |  |  |  |  | # because Carp requires Exporter, and something has to give.
12 |  |  |  |  | #
13 |  |  |  |  |
14 |  |  |  |  | # spent 91µs (86+6) within Exporter::Heavy::_rebuild_cache which was called: # once (86µs+6µs) by Exporter::Heavy::heavy_export at line 58 sub _rebuild_cache {
15 | 1 | 600ns |  |  | my ($pkg, $exports, $cache) = @_;
16 | 1 | 1µs |  |  | s/^&// foreach @$exports;
17 | 1 | 1µs |  |  | @{$cache}{@$exports} = (1) x @$exports;
18 | 1 | 2µs |  |  | my $ok = \@{"${pkg}::EXPORT_OK"};
19 | 1 | 4µs |  |  | if (@$ok) {
20 | 1 | 67µs | 49 | 6µs | s/^&// foreach @$ok; # spent 6µs making 49 calls to Exporter::Heavy::CORE:subst, avg 118ns/call
21 | 1 | 18µs |  |  | @{$cache}{@$ok} = (1) x @$ok;
22 |  |  |  |  | }
23 |  |  |  |  | }
24 |  |  |  |  |
25 |  |  |  |  | # spent 154µs (60+94) within Exporter::Heavy::heavy_export which was called: # once (60µs+94µs) by Exporter::Heavy::heavy_export_to_level at line 25 of Exporter.pm sub heavy_export {
26 |  |  |  |  |
27 |  |  |  |  | # Save the old __WARN__ handler in case it was defined
28 | 1 | 900ns |  |  | my $oldwarn = $SIG{__WARN__};
29 |  |  |  |  |
30 |  |  |  |  | # First make import warnings look like they're coming from the "use".
31 |  |  |  |  | local $SIG{__WARN__} = sub {
32 |  |  |  |  | # restore it back so proper stacking occurs
33 |  |  |  |  | local $SIG{__WARN__} = $oldwarn;
34 |  |  |  |  | my $text = shift;
35 |  |  |  |  | if ($text =~ s/ at \S*Exporter\S*.pm line \d+.*\n//) {
36 |  |  |  |  | require Carp;
37 |  |  |  |  | local $Carp::CarpLevel = 1; # ignore package calling us too.
38 |  |  |  |  | Carp::carp($text);
39 |  |  |  |  | }
40 |  |  |  |  | else {
41 |  |  |  |  | warn $text;
42 |  |  |  |  | }
43 | 1 | 6µs |  |  | };
44 |  |  |  |  | local $SIG{__DIE__} = sub {
45 |  |  |  |  | require Carp;
46 |  |  |  |  | local $Carp::CarpLevel = 1; # ignore package calling us too.
47 |  |  |  |  | Carp::croak("$_[0]Illegal null symbol in \@${1}::EXPORT")
48 |  |  |  |  | if $_[0] =~ /^Unable to create sub named "(.*?)::"/;
49 | 1 | 4µs |  |  | };
50 |  |  |  |  |
51 | 1 | 2µs |  |  | my($pkg, $callpkg, @imports) = @_;
52 | 1 | 300ns |  |  | my($type, $sym, $cache_is_current, $oops);
53 |  |  |  |  | my($exports, $export_cache) = (\@{"${pkg}::EXPORT"},
54 | 1 | 3µs |  |  | $Exporter::Cache{$pkg} ||= {});
55 |  |  |  |  |
56 | 1 | 800ns |  |  | if (@imports) {
57 | 1 | 500ns |  |  | if (!%$export_cache) {
58 | 1 | 1µs | 1 | 91µs | _rebuild_cache ($pkg, $exports, $export_cache); # spent 91µs making 1 call to Exporter::Heavy::_rebuild_cache
59 | 1 | 400ns |  |  | $cache_is_current = 1;
60 |  |  |  |  | }
61 |  |  |  |  |
62 | 1 | 8µs | 2 | 1µs | if (grep m{^[/!:]}, @imports) { # spent 1µs making 2 calls to Exporter::Heavy::CORE:match, avg 650ns/call
63 |  |  |  |  | my $tagsref = \%{"${pkg}::EXPORT_TAGS"};
64 |  |  |  |  | my $tagdata;
65 |  |  |  |  | my %imports;
66 |  |  |  |  | my($remove, $spec, @names, @allexports);
67 |  |  |  |  | # negated first item implies starting with default set:
68 |  |  |  |  | unshift @imports, ':DEFAULT' if $imports[0] =~ m/^!/;
69 |  |  |  |  | foreach $spec (@imports){
70 |  |  |  |  | $remove = $spec =~ s/^!//;
71 |  |  |  |  |
72 |  |  |  |  | if ($spec =~ s/^://){
73 |  |  |  |  | if ($spec eq 'DEFAULT'){
74 |  |  |  |  | @names = @$exports;
75 |  |  |  |  | }
76 |  |  |  |  | elsif ($tagdata = $tagsref->{$spec}) {
77 |  |  |  |  | @names = @$tagdata;
78 |  |  |  |  | }
79 |  |  |  |  | else {
80 |  |  |  |  | warn qq["$spec" is not defined in %${pkg}::EXPORT_TAGS];
81 |  |  |  |  | ++$oops;
82 |  |  |  |  | next;
83 |  |  |  |  | }
84 |  |  |  |  | }
85 |  |  |  |  | elsif ($spec =~ m:^/(.*)/$:){
86 |  |  |  |  | my $patn = $1;
87 |  |  |  |  | @allexports = keys %$export_cache unless @allexports; # only do keys once
88 |  |  |  |  | @names = grep(/$patn/, @allexports); # not anchored by default
89 |  |  |  |  | }
90 |  |  |  |  | else {
91 |  |  |  |  | @names = ($spec); # is a normal symbol name
92 |  |  |  |  | }
93 |  |  |  |  |
94 |  |  |  |  | warn "Import ".($remove ? "del":"add").": @names "
95 |  |  |  |  | if $Exporter::Verbose;
96 |  |  |  |  |
97 |  |  |  |  | if ($remove) {
98 |  |  |  |  | foreach $sym (@names) { delete $imports{$sym} }
99 |  |  |  |  | }
100 |  |  |  |  | else {
101 |  |  |  |  | @imports{@names} = (1) x @names;
102 |  |  |  |  | }
103 |  |  |  |  | }
104 |  |  |  |  | @imports = keys %imports;
105 |  |  |  |  | }
106 |  |  |  |  |
107 | 1 | 200ns |  |  | my @carp;
108 | 1 | 500ns |  |  | foreach $sym (@imports) {
109 | 2 | 2µs |  |  | if (!$export_cache->{$sym}) {
110 |  |  |  |  | if ($sym =~ m/^\d/) {
111 |  |  |  |  | $pkg->VERSION($sym); # inherit from UNIVERSAL
112 |  |  |  |  | # If the version number was the only thing specified
113 |  |  |  |  | # then we should act as if nothing was specified:
114 |  |  |  |  | if (@imports == 1) {
115 |  |  |  |  | @imports = @$exports;
116 |  |  |  |  | last;
117 |  |  |  |  | }
118 |  |  |  |  | # We need a way to emulate 'use Foo ()' but still
119 |  |  |  |  | # allow an easy version check: "use Foo 1.23, ''";
120 |  |  |  |  | if (@imports == 2 and !$imports[1]) {
121 |  |  |  |  | @imports = ();
122 |  |  |  |  | last;
123 |  |  |  |  | }
124 |  |  |  |  | } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) {
125 |  |  |  |  | # Last chance - see if they've updated EXPORT_OK since we
126 |  |  |  |  | # cached it.
127 |  |  |  |  |
128 |  |  |  |  | unless ($cache_is_current) {
129 |  |  |  |  | %$export_cache = ();
130 |  |  |  |  | _rebuild_cache ($pkg, $exports, $export_cache);
131 |  |  |  |  | $cache_is_current = 1;
132 |  |  |  |  | }
133 |  |  |  |  |
134 |  |  |  |  | if (!$export_cache->{$sym}) {
135 |  |  |  |  | # accumulate the non-exports
136 |  |  |  |  | push @carp,
137 |  |  |  |  | qq["$sym" is not exported by the $pkg module\n];
138 |  |  |  |  | $oops++;
139 |  |  |  |  | }
140 |  |  |  |  | }
141 |  |  |  |  | }
142 |  |  |  |  | }
143 | 1 | 500ns |  |  | if ($oops) {
144 |  |  |  |  | require Carp;
145 |  |  |  |  | Carp::croak("@{carp}Can't continue after import errors");
146 |  |  |  |  | }
147 |  |  |  |  | }
148 |  |  |  |  | else {
149 |  |  |  |  | @imports = @$exports;
150 |  |  |  |  | }
151 |  |  |  |  |
152 |  |  |  |  | my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"},
153 | 1 | 4µs |  |  | $Exporter::FailCache{$pkg} ||= {});
154 |  |  |  |  |
155 | 1 | 300ns |  |  | if (@$fail) {
156 |  |  |  |  | if (!%$fail_cache) {
157 |  |  |  |  | # Build cache of symbols. Optimise the lookup by adding
158 |  |  |  |  | # barewords twice... both with and without a leading &.
159 |  |  |  |  | # (Technique could be applied to $export_cache at cost of memory)
160 |  |  |  |  | my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail;
161 |  |  |  |  | warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Exporter::Verbose;
162 |  |  |  |  | @{$fail_cache}{@expanded} = (1) x @expanded;
163 |  |  |  |  | }
164 |  |  |  |  | my @failed;
165 |  |  |  |  | foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} }
166 |  |  |  |  | if (@failed) {
167 |  |  |  |  | @failed = $pkg->export_fail(@failed);
168 |  |  |  |  | foreach $sym (@failed) {
169 |  |  |  |  | require Carp;
170 |  |  |  |  | Carp::carp(qq["$sym" is not implemented by the $pkg module ],
171 |  |  |  |  | "on this architecture");
172 |  |  |  |  | }
173 |  |  |  |  | if (@failed) {
174 |  |  |  |  | require Carp;
175 |  |  |  |  | Carp::croak("Can't continue after import errors");
176 |  |  |  |  | }
177 |  |  |  |  | }
178 |  |  |  |  | }
179 |  |  |  |  |
180 | 1 | 200ns |  |  | warn "Importing into $callpkg from $pkg: ",
181 |  |  |  |  | join(", ",sort @imports) if $Exporter::Verbose;
182 |  |  |  |  |
183 | 1 | 13µs |  |  | foreach $sym (@imports) {
184 |  |  |  |  | # shortcut for the common case of no type character
185 | 2 | 16µs | 2 | 1µs | (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next) # spent 1µs making 2 calls to Exporter::Heavy::CORE:subst, avg 550ns/call
186 |  |  |  |  | unless $sym =~ s/^(\W)//;
187 |  |  |  |  | $type = $1;
188 | 2 | 602µs | 2 | 51µs | # spent 34µs (17+17) within Exporter::Heavy::BEGIN@188 which was called: # once (17µs+17µs) by Exporter::as_heavy at line 188 no warnings 'once'; # spent 34µs making 1 call to Exporter::Heavy::BEGIN@188 # spent 17µs making 1 call to warnings::unimport
189 |  |  |  |  | *{"${callpkg}::$sym"} =
190 |  |  |  |  | $type eq '&' ? \&{"${pkg}::$sym"} :
191 |  |  |  |  | $type eq '$' ? \${"${pkg}::$sym"} :
192 |  |  |  |  | $type eq '@' ? \@{"${pkg}::$sym"} :
193 |  |  |  |  | $type eq '%' ? \%{"${pkg}::$sym"} :
194 |  |  |  |  | $type eq '*' ? *{"${pkg}::$sym"} :
195 |  |  |  |  | do { require Carp; Carp::croak("Can't export symbol: $type$sym") };
196 |  |  |  |  | }
197 |  |  |  |  | }
198 |  |  |  |  |
199 |  |  |  |  | sub heavy_export_to_level
200 |  |  |  |  | # spent 179µs (13+166) within Exporter::Heavy::heavy_export_to_level which was called: # once (13µs+166µs) by Time::HiRes::import at line 81 of Exporter.pm {
201 | 1 | 600ns |  |  | my $pkg = shift;
202 | 1 | 300ns |  |  | my $level = shift;
203 | 1 | 600ns |  |  | (undef) = shift; # XXX redundant arg
204 | 1 | 700ns |  |  | my $callpkg = caller($level);
205 | 1 | 7µs | 1 | 12µs | $pkg->export($callpkg, @_); # spent 12µs making 1 call to Exporter::export
206 |  |  |  |  | }
207 |  |  |  |  |
208 |  |  |  |  | # Utility functions
209 |  |  |  |  |
210 |  |  |  |  | sub _push_tags {
211 |  |  |  |  | my($pkg, $var, $syms) = @_;
212 |  |  |  |  | my @nontag = ();
213 |  |  |  |  | my $export_tags = \%{"${pkg}::EXPORT_TAGS"};
214 |  |  |  |  | push(@{"${pkg}::$var"},
215 |  |  |  |  | map { $export_tags->{$_} ? @{$export_tags->{$_}}
216 |  |  |  |  | : scalar(push(@nontag,$_),$_) }
217 |  |  |  |  | (@$syms) ? @$syms : keys %$export_tags);
218 |  |  |  |  | if (@nontag and $^W) {
219 |  |  |  |  | # This may change to a die one day
220 |  |  |  |  | require Carp;
221 |  |  |  |  | Carp::carp(join(", ", @nontag)." are not tags of $pkg");
222 |  |  |  |  | }
223 |  |  |  |  | }
224 |  |  |  |  |
225 |  |  |  |  | sub heavy_require_version {
226 |  |  |  |  | my($self, $wanted) = @_;
227 |  |  |  |  | my $pkg = ref $self || $self;
228 |  |  |  |  | return ${pkg}->VERSION($wanted);
229 |  |  |  |  | }
230 |  |  |  |  |
231 |  |  |  |  | sub heavy_export_tags {
232 |  |  |  |  | _push_tags((caller)[0], "EXPORT", \@_);
233 |  |  |  |  | }
234 |  |  |  |  |
235 |  |  |  |  | sub heavy_export_ok_tags {
236 |  |  |  |  | _push_tags((caller)[0], "EXPORT_OK", \@_);
237 |  |  |  |  | }
238 |  |  |  |  |
239 | 1 | 5µs |  |  | 1;
|  |  |  |  | # spent 1µs within Exporter::Heavy::CORE:match which was called 2 times, avg 650ns/call: # 2 times (1µs+0s) by Exporter::Heavy::heavy_export at line 62, avg 650ns/call sub Exporter::Heavy::CORE:match; # opcode
|  |  |  |  | # spent 7µs within Exporter::Heavy::CORE:subst which was called 51 times, avg 135ns/call: # 49 times (6µs+0s) by Exporter::Heavy::_rebuild_cache at line 20, avg 118ns/call # 2 times (1µs+0s) by Exporter::Heavy::heavy_export at line 185, avg 550ns/call sub Exporter::Heavy::CORE:subst; # opcode