Profile of base.pm

Filename	/usr/share/perl/5.18/base.pm
Statements	Executed 91 statements in 1.31ms

Subroutines
Calls	P	F	Exclusive Time	Inclusive Time	Subroutine
3	3	3	237µs	267µs	base::::importbase::import
1	1	1	15µs	30µs	base::::BEGIN@3base::BEGIN@3
3	1	1	13µs	13µs	base::::has_fieldsbase::has_fields
3	1	1	9µs	9µs	base::::has_attrbase::has_attr
1	1	1	9µs	40µs	base::::BEGIN@4base::BEGIN@4
0	0	0	0s	0s	base::::__ANON__[:47]base::__ANON__[:47]
0	0	0	0s	0s	base::::__ANON__[:54]base::__ANON__[:54]
0	0	0	0s	0s	base::::get_attrbase::get_attr
0	0	0	0s	0s	base::::inherit_fieldsbase::inherit_fields

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

Line	State ments	Time on line	Calls	Time in subs	Code
1					package base;
2
3	2	34µs	2	46µs	# spent 30µs (15+16) within base::BEGIN@3 which was called: # once (15µs+16µs) by Variable::Magic::BEGIN@688 at line 3 use strict 'vars'; # spent 30µs making 1 call to base::BEGIN@3 # spent 16µs making 1 call to strict::import
4	2	982µs	2	72µs	# spent 40µs (9+31) within base::BEGIN@4 which was called: # once (9µs+31µs) by Variable::Magic::BEGIN@688 at line 4 use vars qw($VERSION); # spent 40µs making 1 call to base::BEGIN@4 # spent 31µs making 1 call to vars::import
5	1	1µs			$VERSION = '2.18';
6	1	18µs			$VERSION = eval $VERSION; # spent 3µs executing statements in string eval
7
8					# constant.pm is slow
9					sub SUCCESS () { 1 }
10
11					sub PUBLIC () { 2**0 }
12					sub PRIVATE () { 2**1 }
13					sub INHERITED () { 2**2 }
14					sub PROTECTED () { 2**3 }
15
16	1	1µs			my $Fattr = \%fields::attr;
17
18					# spent 13µs within base::has_fields which was called 3 times, avg 4µs/call: # 3 times (13µs+0s) by base::import at line 100, avg 4µs/call sub has_fields {
19	3	3µs			my($base) = shift;
20	3	3µs			my $fglob = ${"$base\::"}{FIELDS};
21	3	15µs			return( ($fglob && 'GLOB' eq ref($fglob) && *$fglob{HASH}) ? 1 : 0 );
22					}
23
24					# spent 9µs within base::has_attr which was called 3 times, avg 3µs/call: # 3 times (9µs+0s) by base::import at line 100, avg 3µs/call sub has_attr {
25	3	2µs			my($proto) = shift;
26	3	2µs			my($class) = ref $proto \|\| $proto;
27	3	11µs			return exists $Fattr->{$class};
28					}
29
30					sub get_attr {
31					$Fattr->{$_[0]} = [1] unless $Fattr->{$_[0]};
32					return $Fattr->{$_[0]};
33					}
34
35	1	1µs			if ($] < 5.009) {
36					*get_fields = sub {
37					# Shut up a possible typo warning.
38					() = \%{$_[0].'::FIELDS'};
39					my $f = \%{$_[0].'::FIELDS'};
40
41					# should be centralized in fields? perhaps
42					# fields::mk_FIELDS_be_OK. Peh. As long as %{ $package . '::FIELDS' }
43					# is used here anyway, it doesn't matter.
44					bless $f, 'pseudohash' if (ref($f) ne 'pseudohash');
45
46					return $f;
47					}
48					}
49					else {
50					*get_fields = sub {
51					# Shut up a possible typo warning.
52					() = \%{$_[0].'::FIELDS'};
53					return \%{$_[0].'::FIELDS'};
54					}
55	1	4µs			}
56
57					# spent 267µs (237+30) within base::import which was called 3 times, avg 89µs/call: # once (84µs+11µs) by Class::Method::Modifiers::BEGIN@14 at line 14 of Class/Method/Modifiers.pm # once (77µs+10µs) by Variable::Magic::BEGIN@688 at line 688 of Variable/Magic.pm # once (76µs+9µs) by namespace::clean::_Util::BEGIN@15 at line 15 of namespace/clean/_Util.pm sub import {
58	3	2µs			my $class = shift;
59
60	3	2µs			return SUCCESS unless @_;
61
62					# List of base classes from which we will inherit %FIELDS.
63	3	600ns			my $fields_base;
64
65	3	3µs			my $inheritor = caller(0);
66
67	3	1µs			my @bases;
68	3	4µs			foreach my $base (@_) {
69	3	2µs			if ( $inheritor eq $base ) {
70					warn "Class '$inheritor' tried to inherit from itself\n";
71					}
72
73	3	51µs	3	7µs	next if grep $_->isa($base), ($inheritor, @bases); # spent 7µs making 3 calls to UNIVERSAL::isa, avg 2µs/call
74
75					# Following blocks help isolate $SIG{__DIE__} changes
76					{
77	6	2µs			my $sigdie;
78					{
79	6	8µs			local $SIG{__DIE__};
80	3	71µs			eval "require $base"; # spent 8µs executing statements in 3 string evals (merged)
81					# Only ignore "Can't locate" errors from our eval require.
82					# Other fatal errors (syntax etc) must be reported.
83	3	900ns			die if $@ && $@ !~ /^Can't locate .*? at \(eval /;
84	3	8µs			unless (%{"$base\::"}) {
85					require Carp;
86					local $" = " ";
87					Carp::croak(<<ERROR);
88					Base class package "$base" is empty.
89					(Perhaps you need to 'use' the module which defines that package first,
90					or make that module available in \@INC (\@INC contains: @INC).
91					ERROR
92					}
93	3	12µs			$sigdie = $SIG{__DIE__} \|\| undef;
94					}
95					# Make sure a global $SIG{__DIE__} makes it out of the localization.
96	3	2µs			$SIG{__DIE__} = $sigdie if defined $sigdie;
97					}
98	3	2µs			push @bases, $base;
99
100	3	14µs	6	23µs	if ( has_fields($base) \|\| has_attr($base) ) { # spent 13µs making 3 calls to base::has_fields, avg 4µs/call # spent 9µs making 3 calls to base::has_attr, avg 3µs/call
101					# No multiple fields inheritance suck
102					if ($fields_base) {
103					require Carp;
104					Carp::croak("Can't multiply inherit fields");
105					} else {
106					$fields_base = $base;
107					}
108					}
109					}
110					# Save this until the end so it's all or nothing if the above loop croaks.
111	3	32µs			push @{"$inheritor\::ISA"}, @bases;
112
113	3	14µs			if( defined $fields_base ) {
114					inherit_fields($inheritor, $fields_base);
115					}
116					}
117
118					sub inherit_fields {
119					my($derived, $base) = @_;
120
121					return SUCCESS unless $base;
122
123					my $battr = get_attr($base);
124					my $dattr = get_attr($derived);
125					my $dfields = get_fields($derived);
126					my $bfields = get_fields($base);
127
128					$dattr->[0] = @$battr;
129
130					if( keys %$dfields ) {
131					warn <<"END";
132					$derived is inheriting from $base but already has its own fields!
133					This will cause problems. Be sure you use base BEFORE declaring fields.
134					END
135
136					}
137
138					# Iterate through the base's fields adding all the non-private
139					# ones to the derived class. Hang on to the original attribute
140					# (Public, Private, etc...) and add Inherited.
141					# This is all too complicated to do efficiently with add_fields().
142					while (my($k,$v) = each %$bfields) {
143					my $fno;
144					if ($fno = $dfields->{$k} and $fno != $v) {
145					require Carp;
146					Carp::croak ("Inherited fields can't override existing fields");
147					}
148
149					if( $battr->[$v] & PRIVATE ) {
150					$dattr->[$v] = PRIVATE \| INHERITED;
151					}
152					else {
153					$dattr->[$v] = INHERITED \| $battr->[$v];
154					$dfields->{$k} = $v;
155					}
156					}
157
158					foreach my $idx (1..$#{$battr}) {
159					next if defined $dattr->[$idx];
160					$dattr->[$idx] = $battr->[$idx] & INHERITED;
161					}
162					}
163
164	1	5µs			1;
165
166					__END__