| File | /opt/wise/lib/perl5/5.10.0/x86_64-linux-thread-multi/Scalar/Util.pm | Statements Executed | 14 | Total Time | 0.001471 seconds |
| Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine | |
|---|---|---|---|---|---|---|
| 83535 | 6 | 3 | 0.30006 | 0.30006 | Scalar::Util:: | blessed (xsub) |
| 83352 | 7 | 3 | 0.27318 | 0.27318 | Scalar::Util:: | reftype (xsub) |
| 9 | 4 | 5 | 4.8e-5 | 4.8e-5 | Scalar::Util:: | weaken (xsub) |
| 0 | 0 | 0 | 0 | 0 | Scalar::Util:: | BEGIN |
| 0 | 0 | 0 | 0 | 0 | Scalar::Util:: | export_fail |
| 0 | 0 | 0 | 0 | 0 | Scalar::Util:: | openhandle |
| Line | Stmts. | Exclusive Time | Avg. | Code |
|---|---|---|---|---|
| 1 | # Scalar::Util.pm | |||
| 2 | # | |||
| 3 | # Copyright (c) 1997-2006 Graham Barr <gbarr@pobox.com>. All rights reserved. | |||
| 4 | # This program is free software; you can redistribute it and/or | |||
| 5 | # modify it under the same terms as Perl itself. | |||
| 6 | ||||
| 7 | package Scalar::Util; | |||
| 8 | ||||
| 9 | 3 | 3.3e-5 | 1.1e-5 | use strict; # spent 11µs making 1 call to strict::import |
| 10 | 3 | 0.00036 | 0.00012 | use vars qw(@ISA @EXPORT_OK $VERSION); # spent 49µs making 1 call to vars::import |
| 11 | 1 | 1.0e-6 | 1.0e-6 | require Exporter; |
| 12 | 1 | 0.00104 | 0.00104 | require List::Util; # List::Util loads the XS |
| 13 | ||||
| 14 | 1 | 6.0e-6 | 6.0e-6 | @ISA = qw(Exporter); |
| 15 | 1 | 4.0e-6 | 4.0e-6 | @EXPORT_OK = qw(blessed dualvar reftype weaken isweak tainted readonly openhandle refaddr isvstring looks_like_number set_prototype); |
| 16 | 1 | 0 | 0 | $VERSION = "1.19"; |
| 17 | 1 | 2.1e-5 | 2.1e-5 | $VERSION = eval $VERSION; |
| 18 | ||||
| 19 | sub export_fail { | |||
| 20 | if (grep { /^(weaken|isweak)$/ } @_ ) { | |||
| 21 | require Carp; | |||
| 22 | Carp::croak("Weak references are not implemented in the version of perl"); | |||
| 23 | } | |||
| 24 | if (grep { /^(isvstring)$/ } @_ ) { | |||
| 25 | require Carp; | |||
| 26 | Carp::croak("Vstrings are not implemented in the version of perl"); | |||
| 27 | } | |||
| 28 | if (grep { /^(dualvar|set_prototype)$/ } @_ ) { | |||
| 29 | require Carp; | |||
| 30 | Carp::croak("$1 is only avaliable with the XS version"); | |||
| 31 | } | |||
| 32 | ||||
| 33 | @_; | |||
| 34 | } | |||
| 35 | ||||
| 36 | sub openhandle ($) { | |||
| 37 | my $fh = shift; | |||
| 38 | my $rt = reftype($fh) || ''; | |||
| 39 | ||||
| 40 | return defined(fileno($fh)) ? $fh : undef | |||
| 41 | if $rt eq 'IO'; | |||
| 42 | ||||
| 43 | if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) | |||
| 44 | $fh = \(my $tmp=$fh); | |||
| 45 | } | |||
| 46 | elsif ($rt ne 'GLOB') { | |||
| 47 | return undef; | |||
| 48 | } | |||
| 49 | ||||
| 50 | (tied(*$fh) or defined(fileno($fh))) | |||
| 51 | ? $fh : undef; | |||
| 52 | } | |||
| 53 | ||||
| 54 | 1 | 1.0e-6 | 1.0e-6 | eval <<'ESQ' unless defined &dualvar; |
| 55 | ||||
| 56 | use vars qw(@EXPORT_FAIL); | |||
| 57 | push @EXPORT_FAIL, qw(weaken isweak dualvar isvstring set_prototype); | |||
| 58 | ||||
| 59 | # The code beyond here is only used if the XS is not installed | |||
| 60 | ||||
| 61 | # Hope nobody defines a sub by this name | |||
| 62 | sub UNIVERSAL::a_sub_not_likely_to_be_here { ref($_[0]) } | |||
| 63 | ||||
| 64 | sub blessed ($) { | |||
| 65 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); | |||
| 66 | length(ref($_[0])) | |||
| 67 | ? eval { $_[0]->a_sub_not_likely_to_be_here } | |||
| 68 | : undef | |||
| 69 | } | |||
| 70 | ||||
| 71 | sub refaddr($) { | |||
| 72 | my $pkg = ref($_[0]) or return undef; | |||
| 73 | if (blessed($_[0])) { | |||
| 74 | bless $_[0], 'Scalar::Util::Fake'; | |||
| 75 | } | |||
| 76 | else { | |||
| 77 | $pkg = undef; | |||
| 78 | } | |||
| 79 | "$_[0]" =~ /0x(\w+)/; | |||
| 80 | my $i = do { local $^W; hex $1 }; | |||
| 81 | bless $_[0], $pkg if defined $pkg; | |||
| 82 | $i; | |||
| 83 | } | |||
| 84 | ||||
| 85 | sub reftype ($) { | |||
| 86 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); | |||
| 87 | my $r = shift; | |||
| 88 | my $t; | |||
| 89 | ||||
| 90 | length($t = ref($r)) or return undef; | |||
| 91 | ||||
| 92 | # This eval will fail if the reference is not blessed | |||
| 93 | eval { $r->a_sub_not_likely_to_be_here; 1 } | |||
| 94 | ? do { | |||
| 95 | $t = eval { | |||
| 96 | # we have a GLOB or an IO. Stringify a GLOB gives it's name | |||
| 97 | my $q = *$r; | |||
| 98 | $q =~ /^\*/ ? "GLOB" : "IO"; | |||
| 99 | } | |||
| 100 | or do { | |||
| 101 | # OK, if we don't have a GLOB what parts of | |||
| 102 | # a glob will it populate. | |||
| 103 | # NOTE: A glob always has a SCALAR | |||
| 104 | local *glob = $r; | |||
| 105 | defined *glob{ARRAY} && "ARRAY" | |||
| 106 | or defined *glob{HASH} && "HASH" | |||
| 107 | or defined *glob{CODE} && "CODE" | |||
| 108 | or length(ref(${$r})) ? "REF" : "SCALAR"; | |||
| 109 | } | |||
| 110 | } | |||
| 111 | : $t | |||
| 112 | } | |||
| 113 | ||||
| 114 | sub tainted { | |||
| 115 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); | |||
| 116 | local $^W = 0; | |||
| 117 | eval { kill 0 * $_[0] }; | |||
| 118 | $@ =~ /^Insecure/; | |||
| 119 | } | |||
| 120 | ||||
| 121 | sub readonly { | |||
| 122 | return 0 if tied($_[0]) || (ref(\($_[0])) ne "SCALAR"); | |||
| 123 | ||||
| 124 | local($@, $SIG{__DIE__}, $SIG{__WARN__}); | |||
| 125 | my $tmp = $_[0]; | |||
| 126 | ||||
| 127 | !eval { $_[0] = $tmp; 1 }; | |||
| 128 | } | |||
| 129 | ||||
| 130 | sub looks_like_number { | |||
| 131 | local $_ = shift; | |||
| 132 | ||||
| 133 | # checks from perlfaq4 | |||
| 134 | return 0 if !defined($_) or ref($_); | |||
| 135 | return 1 if (/^[+-]?\d+$/); # is a +/- integer | |||
| 136 | return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # a C float | |||
| 137 | return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i); | |||
| 138 | ||||
| 139 | 0; | |||
| 140 | } | |||
| 141 | ||||
| 142 | ESQ | |||
| 143 | ||||
| 144 | 1 | 8.0e-6 | 8.0e-6 | 1; |
| 145 | ||||
| 146 | __END__ | |||
| 147 | ||||
| 148 | =head1 NAME | |||
| 149 | ||||
| 150 | Scalar::Util - A selection of general-utility scalar subroutines | |||
| 151 | ||||
| 152 | =head1 SYNOPSIS | |||
| 153 | ||||
| 154 | use Scalar::Util qw(blessed dualvar isweak readonly refaddr reftype tainted | |||
| 155 | weaken isvstring looks_like_number set_prototype); | |||
| 156 | ||||
| 157 | =head1 DESCRIPTION | |||
| 158 | ||||
| 159 | C<Scalar::Util> contains a selection of subroutines that people have | |||
| 160 | expressed would be nice to have in the perl core, but the usage would | |||
| 161 | not really be high enough to warrant the use of a keyword, and the size | |||
| 162 | so small such that being individual extensions would be wasteful. | |||
| 163 | ||||
| 164 | By default C<Scalar::Util> does not export any subroutines. The | |||
| 165 | subroutines defined are | |||
| 166 | ||||
| 167 | =over 4 | |||
| 168 | ||||
| 169 | =item blessed EXPR | |||
| 170 | ||||
| 171 | If EXPR evaluates to a blessed reference the name of the package | |||
| 172 | that it is blessed into is returned. Otherwise C<undef> is returned. | |||
| 173 | ||||
| 174 | $scalar = "foo"; | |||
| 175 | $class = blessed $scalar; # undef | |||
| 176 | ||||
| 177 | $ref = []; | |||
| 178 | $class = blessed $ref; # undef | |||
| 179 | ||||
| 180 | $obj = bless [], "Foo"; | |||
| 181 | $class = blessed $obj; # "Foo" | |||
| 182 | ||||
| 183 | =item dualvar NUM, STRING | |||
| 184 | ||||
| 185 | Returns a scalar that has the value NUM in a numeric context and the | |||
| 186 | value STRING in a string context. | |||
| 187 | ||||
| 188 | $foo = dualvar 10, "Hello"; | |||
| 189 | $num = $foo + 2; # 12 | |||
| 190 | $str = $foo . " world"; # Hello world | |||
| 191 | ||||
| 192 | =item isvstring EXPR | |||
| 193 | ||||
| 194 | If EXPR is a scalar which was coded as a vstring the result is true. | |||
| 195 | ||||
| 196 | $vs = v49.46.48; | |||
| 197 | $fmt = isvstring($vs) ? "%vd" : "%s"; #true | |||
| 198 | printf($fmt,$vs); | |||
| 199 | ||||
| 200 | =item isweak EXPR | |||
| 201 | ||||
| 202 | If EXPR is a scalar which is a weak reference the result is true. | |||
| 203 | ||||
| 204 | $ref = \$foo; | |||
| 205 | $weak = isweak($ref); # false | |||
| 206 | weaken($ref); | |||
| 207 | $weak = isweak($ref); # true | |||
| 208 | ||||
| 209 | B<NOTE>: Copying a weak reference creates a normal, strong, reference. | |||
| 210 | ||||
| 211 | $copy = $ref; | |||
| 212 | $weak = isweak($ref); # false | |||
| 213 | ||||
| 214 | =item looks_like_number EXPR | |||
| 215 | ||||
| 216 | Returns true if perl thinks EXPR is a number. See | |||
| 217 | L<perlapi/looks_like_number>. | |||
| 218 | ||||
| 219 | =item openhandle FH | |||
| 220 | ||||
| 221 | Returns FH if FH may be used as a filehandle and is open, or FH is a tied | |||
| 222 | handle. Otherwise C<undef> is returned. | |||
| 223 | ||||
| 224 | $fh = openhandle(*STDIN); # \*STDIN | |||
| 225 | $fh = openhandle(\*STDIN); # \*STDIN | |||
| 226 | $fh = openhandle(*NOTOPEN); # undef | |||
| 227 | $fh = openhandle("scalar"); # undef | |||
| 228 | ||||
| 229 | =item readonly SCALAR | |||
| 230 | ||||
| 231 | Returns true if SCALAR is readonly. | |||
| 232 | ||||
| 233 | sub foo { readonly($_[0]) } | |||
| 234 | ||||
| 235 | $readonly = foo($bar); # false | |||
| 236 | $readonly = foo(0); # true | |||
| 237 | ||||
| 238 | =item refaddr EXPR | |||
| 239 | ||||
| 240 | If EXPR evaluates to a reference the internal memory address of | |||
| 241 | the referenced value is returned. Otherwise C<undef> is returned. | |||
| 242 | ||||
| 243 | $addr = refaddr "string"; # undef | |||
| 244 | $addr = refaddr \$var; # eg 12345678 | |||
| 245 | $addr = refaddr []; # eg 23456784 | |||
| 246 | ||||
| 247 | $obj = bless {}, "Foo"; | |||
| 248 | $addr = refaddr $obj; # eg 88123488 | |||
| 249 | ||||
| 250 | =item reftype EXPR | |||
| 251 | ||||
| 252 | If EXPR evaluates to a reference the type of the variable referenced | |||
| 253 | is returned. Otherwise C<undef> is returned. | |||
| 254 | ||||
| 255 | $type = reftype "string"; # undef | |||
| 256 | $type = reftype \$var; # SCALAR | |||
| 257 | $type = reftype []; # ARRAY | |||
| 258 | ||||
| 259 | $obj = bless {}, "Foo"; | |||
| 260 | $type = reftype $obj; # HASH | |||
| 261 | ||||
| 262 | =item set_prototype CODEREF, PROTOTYPE | |||
| 263 | ||||
| 264 | Sets the prototype of the given function, or deletes it if PROTOTYPE is | |||
| 265 | undef. Returns the CODEREF. | |||
| 266 | ||||
| 267 | set_prototype \&foo, '$$'; | |||
| 268 | ||||
| 269 | =item tainted EXPR | |||
| 270 | ||||
| 271 | Return true if the result of EXPR is tainted | |||
| 272 | ||||
| 273 | $taint = tainted("constant"); # false | |||
| 274 | $taint = tainted($ENV{PWD}); # true if running under -T | |||
| 275 | ||||
| 276 | =item weaken REF | |||
| 277 | ||||
| 278 | REF will be turned into a weak reference. This means that it will not | |||
| 279 | hold a reference count on the object it references. Also when the reference | |||
| 280 | count on that object reaches zero, REF will be set to undef. | |||
| 281 | ||||
| 282 | This is useful for keeping copies of references , but you don't want to | |||
| 283 | prevent the object being DESTROY-ed at its usual time. | |||
| 284 | ||||
| 285 | { | |||
| 286 | my $var; | |||
| 287 | $ref = \$var; | |||
| 288 | weaken($ref); # Make $ref a weak reference | |||
| 289 | } | |||
| 290 | # $ref is now undef | |||
| 291 | ||||
| 292 | Note that if you take a copy of a scalar with a weakened reference, | |||
| 293 | the copy will be a strong reference. | |||
| 294 | ||||
| 295 | my $var; | |||
| 296 | my $foo = \$var; | |||
| 297 | weaken($foo); # Make $foo a weak reference | |||
| 298 | my $bar = $foo; # $bar is now a strong reference | |||
| 299 | ||||
| 300 | This may be less obvious in other situations, such as C<grep()>, for instance | |||
| 301 | when grepping through a list of weakened references to objects that may have | |||
| 302 | been destroyed already: | |||
| 303 | ||||
| 304 | @object = grep { defined } @object; | |||
| 305 | ||||
| 306 | This will indeed remove all references to destroyed objects, but the remaining | |||
| 307 | references to objects will be strong, causing the remaining objects to never | |||
| 308 | be destroyed because there is now always a strong reference to them in the | |||
| 309 | @object array. | |||
| 310 | ||||
| 311 | =back | |||
| 312 | ||||
| 313 | =head1 KNOWN BUGS | |||
| 314 | ||||
| 315 | There is a bug in perl5.6.0 with UV's that are >= 1<<31. This will | |||
| 316 | show up as tests 8 and 9 of dualvar.t failing | |||
| 317 | ||||
| 318 | =head1 SEE ALSO | |||
| 319 | ||||
| 320 | L<List::Util> | |||
| 321 | ||||
| 322 | =head1 COPYRIGHT | |||
| 323 | ||||
| 324 | Copyright (c) 1997-2006 Graham Barr <gbarr@pobox.com>. All rights reserved. | |||
| 325 | This program is free software; you can redistribute it and/or modify it | |||
| 326 | under the same terms as Perl itself. | |||
| 327 | ||||
| 328 | Except weaken and isweak which are | |||
| 329 | ||||
| 330 | Copyright (c) 1999 Tuomas J. Lukka <lukka@iki.fi>. All rights reserved. | |||
| 331 | This program is free software; you can redistribute it and/or modify it | |||
| 332 | under the same terms as perl itself. | |||
| 333 | ||||
| 334 | =head1 BLATANT PLUG | |||
| 335 | ||||
| 336 | The weaken and isweak subroutines in this module and the patch to the core Perl | |||
| 337 | were written in connection with the APress book `Tuomas J. Lukka's Definitive | |||
| 338 | Guide to Object-Oriented Programming in Perl', to avoid explaining why certain | |||
| 339 | things would have to be done in cumbersome ways. | |||
| 340 | ||||
| 341 | =cut | |||
# spent 300ms within Scalar::Util::blessed which was called 83534 times, avg 4µs/call:
# 83385 times (299ms+0) by Class::Accessor::Grouped::get_inherited at line 292 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 4µs/call
# 98 times (379µs+0) by Class::Accessor::Grouped::_mk_group_accessors at line 63 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 4µs/call
# 35 times (121µs+0) by Class::Accessor::Grouped::set_inherited at line 340 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 3µs/call
# 7 times (23µs+0) by Class::Accessor::Grouped::get_super_paths at line 418 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 3µs/call
# 5 times (25µs+0) by DBIx::Class::Storage::DBI::BEGIN or DBIC::SQL::Abstract::_find_syntax at line 69 of /wise/base/static/lib/perl5/site_perl/5.10.0/DBIx/Class/Storage/DBI.pm, avg 5µs/call
# 4 times (18µs+0) by DBIx::Class::Storage::DBI::_dbh_execute at line 973 of /wise/base/static/lib/perl5/site_perl/5.10.0/DBIx/Class/Storage/DBI.pm, avg 4µs/call | ||||
# spent 273ms within Scalar::Util::reftype which was called 83351 times, avg 3µs/call:
# 83335 times (273ms+0) by Class::Accessor::Grouped::get_inherited at line 293 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 3µs/call
# 11 times (31µs+0) by Class::Accessor::Grouped::set_inherited at line 340 of /wise/base/static/lib/perl5/site_perl/5.10.0/Class/Accessor/Grouped.pm, avg 3µs/call
# once (22µs+0) by WISE::Params::Params at line 102 of /wise/base/deliv/dev/lib/perl/WISE/Params.pm
# once (5µs+0) by WISE::Params::Params at line 123 of /wise/base/deliv/dev/lib/perl/WISE/Params.pm
# once (5µs+0) by WISE::Params::Params at line 112 of /wise/base/deliv/dev/lib/perl/WISE/Params.pm
# once (5µs+0) by WISE::Params::Params at line 126 of /wise/base/deliv/dev/lib/perl/WISE/Params.pm
# once (4µs+0) by WISE::Params::Params at line 129 of /wise/base/deliv/dev/lib/perl/WISE/Params.pm | ||||
# spent 48µs within Scalar::Util::weaken which was called 8 times, avg 6µs/call:
# 5 times (21µs+0) by DBIx::Class::Schema::register_source at line 109 of /wise/base/static/lib/perl5/site_perl/5.10.0/DBIx/Class/Schema.pm, avg 4µs/call
# once (10µs+0) by DBIx::Class::Storage::DBI::_connect at line 844 of /wise/base/static/lib/perl5/site_perl/5.10.0/DBIx/Class/Storage/DBI.pm
# once (9µs+0) at line 287 of /wise/base/static/lib/perl5/site_perl/5.10.0/x86_64-linux-thread-multi/DBI.pm
# once (8µs+0) by DBIx::Class::Storage::set_schema at line 84 of /wise/base/static/lib/perl5/site_perl/5.10.0/DBIx/Class/Storage.pm |