← Index
NYTProf Performance Profile   « line view »
For /usr/local/libexec/sympa/task_manager-debug.pl
  Run on Tue Jun 1 22:32:51 2021
Reported on Tue Jun 1 22:35:04 2021

Filename/usr/local/lib/perl5/site_perl/namespace/clean.pm
StatementsExecuted 0 statements in 0s
Subroutines
Calls P F Exclusive
Time
Inclusive
Time
Subroutine
0000s0snamespace::clean::::BEGIN@11namespace::clean::BEGIN@11
0000s0snamespace::clean::::BEGIN@16namespace::clean::BEGIN@16
0000s0snamespace::clean::::BEGIN@3namespace::clean::BEGIN@3
0000s0snamespace::clean::::BEGIN@38namespace::clean::BEGIN@38
0000s0snamespace::clean::::BEGIN@4namespace::clean::BEGIN@4
0000s0snamespace::clean::::CORE:matchnamespace::clean::CORE:match (opcode)
0000s0snamespace::clean::::__ANON__[:130]namespace::clean::__ANON__[:130]
0000s0snamespace::clean::::__ANON__[:160]namespace::clean::__ANON__[:160]
0000s0snamespace::clean::::__ANON__[:185]namespace::clean::__ANON__[:185]
0000s0snamespace::clean::::clean_subroutinesnamespace::clean::clean_subroutines
0000s0snamespace::clean::::get_class_storenamespace::clean::get_class_store
0000s0snamespace::clean::::get_functionsnamespace::clean::get_functions
0000s0snamespace::clean::::importnamespace::clean::import
0000s0snamespace::clean::::unimportnamespace::clean::unimport
Call graph for these subroutines as a Graphviz dot language file.
Line State
ments
Time
on line
Calls Time
in subs
Code
1package namespace::clean;
2
3use warnings;
4use strict;
5
6our $VERSION = '0.27';
7$VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases
8
9our $STORAGE_VAR = '__NAMESPACE_CLEAN_STORAGE';
10
11use B::Hooks::EndOfScope 'on_scope_end';
12
13# FIXME This is a crock of shit, needs to go away
14# currently here to work around https://rt.cpan.org/Ticket/Display.html?id=74151
15# kill with fire when PS::XS is *finally* fixed
16BEGIN {
17 my $provider;
18
19 if ( "$]" < 5.008007 ) {
20 require Package::Stash::PP;
21 $provider = 'Package::Stash::PP';
22 }
23 else {
24 require Package::Stash;
25 $provider = 'Package::Stash';
26 }
27 eval <<"EOS" or die $@;
# spent 0s executing statements in string eval
28
29sub stash_for (\$) {
30 $provider->new(\$_[0]);
31}
32
331;
34
35EOS
36}
37
38use namespace::clean::_Util qw( DEBUGGER_NEEDS_CV_RENAME DEBUGGER_NEEDS_CV_PIVOT );
39
40# Built-in debugger CV-retrieval fixups necessary before perl 5.15.5:
41# since we are deleting the glob where the subroutine was originally
42# defined, the assumptions below no longer hold.
43#
44# In 5.8.9 ~ 5.13.5 (inclusive) the debugger assumes that a CV can
45# always be found under sub_fullname($sub)
46# Workaround: use sub naming to properly name the sub hidden in the package's
47# deleted-stash
48#
49# In the rest of the range ( ... ~ 5.8.8 and 5.13.6 ~ 5.15.4 ) the debugger
50# assumes the name of the glob passed to entersub can be used to find the CV
51# Workaround: realias the original glob to the deleted-stash slot
52#
53# While the errors manifest themselves inside perl5db.pl, they are caused by
54# problems inside the interpreter. If enabled ($^P & 0x01) and existent,
55# the DB::sub sub will be called by the interpreter for any sub call rather
56# that call the sub directly. It is provided the real sub to call in $DB::sub,
57# but the value given has the issues described above. We only have to enable
58# the workaround if DB::sub will be used.
59#
60# Can not tie constants to the current value of $^P directly,
61# as the debugger can be enabled during runtime (kinda dubious)
62#
63
64my $RemoveSubs = sub {
65 my $cleanee = shift;
66 my $store = shift;
67 my $cleanee_stash = stash_for($cleanee);
68 my $deleted_stash;
69
70 SYMBOL:
71 for my $f (@_) {
72
73 # ignore already removed symbols
74 next SYMBOL if $store->{exclude}{ $f };
75
76 my $sub = $cleanee_stash->get_symbol("&$f")
77 or next SYMBOL;
78
79 my $need_debugger_fixup =
80 ( DEBUGGER_NEEDS_CV_RENAME or DEBUGGER_NEEDS_CV_PIVOT )
81 &&
82 $^P & 0x01
83 &&
84 defined &DB::sub
85 &&
86 ref(my $globref = \$cleanee_stash->namespace->{$f}) eq 'GLOB'
87 &&
88 ( $deleted_stash ||= stash_for("namespace::clean::deleted::$cleanee") )
89 ;
90
91 # convince the Perl debugger to work
92 # see the comment on top
93 if ( DEBUGGER_NEEDS_CV_RENAME and $need_debugger_fixup ) {
94 #
95 # Note - both get_subname and set_subname are only compiled when CV_RENAME
96 # is true ( the 5.8.9 ~ 5.12 range ). On other perls this entire block is
97 # constant folded away, and so are the definitions in ::_Util
98 #
99 # Do not be surprised that they are missing without DEBUGGER_NEEDS_CV_RENAME
100 #
101 namespace::clean::_Util::get_subname( $sub ) eq ( $cleanee_stash->name . "::$f" )
102 and
103 $deleted_stash->add_symbol(
104 "&$f",
105 namespace::clean::_Util::set_subname( $deleted_stash->name . "::$f", $sub ),
106 );
107 }
108 elsif ( DEBUGGER_NEEDS_CV_PIVOT and $need_debugger_fixup ) {
109 $deleted_stash->add_symbol("&$f", $sub);
110 }
111
112 my @symbols = map {
113 my $name = $_ . $f;
114 my $def = $cleanee_stash->get_symbol($name);
115 defined($def) ? [$name, $def] : ()
116 } '$', '@', '%', '';
117
118 $cleanee_stash->remove_glob($f);
119
120 # if this perl needs no renaming trick we need to
121 # rename the original glob after the fact
122 DEBUGGER_NEEDS_CV_PIVOT
123 and
124 $need_debugger_fixup
125 and
126 *$globref = $deleted_stash->namespace->{$f};
127
128 $cleanee_stash->add_symbol(@$_) for @symbols;
129 }
130};
131
132sub clean_subroutines {
133 my ($nc, $cleanee, @subs) = @_;
134 $RemoveSubs->($cleanee, {}, @subs);
135}
136
137sub import {
138 my ($pragma, @args) = @_;
139
140 my (%args, $is_explicit);
141
142 ARG:
143 while (@args) {
144
145 if ($args[0] =~ /^\-/) {
146 my $key = shift @args;
147 my $value = shift @args;
148 $args{ $key } = $value;
149 }
150 else {
151 $is_explicit++;
152 last ARG;
153 }
154 }
155
156 my $cleanee = exists $args{ -cleanee } ? $args{ -cleanee } : scalar caller;
157 if ($is_explicit) {
158 on_scope_end {
159 $RemoveSubs->($cleanee, {}, @args);
160 };
161 }
162 else {
163
164 # calling class, all current functions and our storage
165 my $functions = $pragma->get_functions($cleanee);
166 my $store = $pragma->get_class_store($cleanee);
167 my $stash = stash_for($cleanee);
168
169 # except parameter can be array ref or single value
170 my %except = map {( $_ => 1 )} (
171 $args{ -except }
172 ? ( ref $args{ -except } eq 'ARRAY' ? @{ $args{ -except } } : $args{ -except } )
173 : ()
174 );
175
176 # register symbols for removal, if they have a CODE entry
177 for my $f (keys %$functions) {
178 next if $except{ $f };
179 next unless $stash->has_symbol("&$f");
180 $store->{remove}{ $f } = 1;
181 }
182
183 on_scope_end {
184 $RemoveSubs->($cleanee, $store, keys %{ $store->{remove} });
185 };
186
187 return 1;
188 }
189}
190
191sub unimport {
192 my ($pragma, %args) = @_;
193
194 # the calling class, the current functions and our storage
195 my $cleanee = exists $args{ -cleanee } ? $args{ -cleanee } : scalar caller;
196 my $functions = $pragma->get_functions($cleanee);
197 my $store = $pragma->get_class_store($cleanee);
198
199 # register all unknown previous functions as excluded
200 for my $f (keys %$functions) {
201 next if $store->{remove}{ $f }
202 or $store->{exclude}{ $f };
203 $store->{exclude}{ $f } = 1;
204 }
205
206 return 1;
207}
208
209sub get_class_store {
210 my ($pragma, $class) = @_;
211 my $stash = stash_for($class);
212 my $var = "%$STORAGE_VAR";
213 $stash->add_symbol($var, {})
214 unless $stash->has_symbol($var);
215 return $stash->get_symbol($var);
216}
217
218sub get_functions {
219 my ($pragma, $class) = @_;
220
221 my $stash = stash_for($class);
222 return {
223 map { $_ => $stash->get_symbol("&$_") }
224 $stash->list_all_symbols('CODE')
225 };
226}
227
228'Danger! Laws of Thermodynamics may not apply.'
229
230__END__