Filename | /home/ss5/perl5/perlbrew/perls/perl-5.14.1/lib/5.14.1/constant.pm |
Statements | Executed 126 statements in 5.48ms |
Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
---|---|---|---|---|---|
4 | 4 | 2 | 556µs | 708µs | import | constant::
7 | 4 | 1 | 134µs | 134µs | CORE:regcomp (opcode) | constant::
1 | 1 | 1 | 91µs | 91µs | BEGIN@2 | constant::
4 | 1 | 1 | 72µs | 72µs | CORE:match (opcode) | constant::
1 | 1 | 1 | 51µs | 51µs | BEGIN@25 | constant::
1 | 1 | 1 | 47µs | 457µs | BEGIN@4 | constant::
1 | 1 | 1 | 34µs | 77µs | BEGIN@52 | constant::
1 | 1 | 1 | 32µs | 52µs | BEGIN@3 | constant::
1 | 1 | 1 | 31µs | 179µs | BEGIN@6 | constant::
1 | 1 | 1 | 30µs | 88µs | BEGIN@114 | constant::
1 | 1 | 1 | 28µs | 80µs | BEGIN@29 | constant::
3 | 3 | 1 | 19µs | 19µs | CORE:qr (opcode) | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:136] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:140] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:142] | constant::
0 | 0 | 0 | 0s | 0s | __ANON__[:31] | constant::
Line | State ments |
Time on line |
Calls | Time in subs |
Code |
---|---|---|---|---|---|
1 | package constant; | ||||
2 | 2 | 201µs | 1 | 91µs | # spent 91µs within constant::BEGIN@2 which was called:
# once (91µs+0s) by JSON::Backend::XS::BEGIN@9 at line 2 # spent 91µs making 1 call to constant::BEGIN@2 |
3 | 2 | 107µs | 2 | 71µs | # spent 52µs (32+20) within constant::BEGIN@3 which was called:
# once (32µs+20µs) by JSON::Backend::XS::BEGIN@9 at line 3 # spent 52µs making 1 call to constant::BEGIN@3
# spent 20µs making 1 call to strict::import |
4 | 2 | 119µs | 2 | 867µs | # spent 457µs (47+410) within constant::BEGIN@4 which was called:
# once (47µs+410µs) by JSON::Backend::XS::BEGIN@9 at line 4 # spent 457µs making 1 call to constant::BEGIN@4
# spent 410µs making 1 call to warnings::register::import |
5 | |||||
6 | 2 | 570µs | 2 | 327µs | # spent 179µs (31+148) within constant::BEGIN@6 which was called:
# once (31µs+148µs) by JSON::Backend::XS::BEGIN@9 at line 6 # spent 179µs making 1 call to constant::BEGIN@6
# spent 148µs making 1 call to vars::import |
7 | 1 | 4µs | $VERSION = '1.21'; | ||
8 | |||||
9 | #======================================================================= | ||||
10 | |||||
11 | # Some names are evil choices. | ||||
12 | 1 | 26µs | my %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD }; | ||
13 | 1 | 15µs | $keywords{UNITCHECK}++ if $] > 5.009; | ||
14 | |||||
15 | 1 | 21µs | my %forced_into_main = map +($_, 1), | ||
16 | qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG }; | ||||
17 | |||||
18 | 1 | 21µs | my %forbidden = (%keywords, %forced_into_main); | ||
19 | |||||
20 | 1 | 4µs | my $str_end = $] >= 5.006 ? "\\z" : "\\Z"; | ||
21 | 1 | 133µs | 2 | 84µs | my $normal_constant_name = qr/^_?[^\W_0-9]\w*$str_end/; # spent 74µs making 1 call to constant::CORE:regcomp
# spent 10µs making 1 call to constant::CORE:qr |
22 | 1 | 41µs | 2 | 24µs | my $tolerable = qr/^[A-Za-z_]\w*$str_end/; # spent 19µs making 1 call to constant::CORE:regcomp
# spent 4µs making 1 call to constant::CORE:qr |
23 | 1 | 41µs | 2 | 24µs | my $boolean = qr/^[01]?$str_end/; # spent 20µs making 1 call to constant::CORE:regcomp
# spent 4µs making 1 call to constant::CORE:qr |
24 | |||||
25 | # spent 51µs within constant::BEGIN@25 which was called:
# once (51µs+0s) by JSON::Backend::XS::BEGIN@9 at line 32 | ||||
26 | # We'd like to do use constant _CAN_PCS => $] > 5.009002 | ||||
27 | # but that's a bit tricky before we load the constant module :-) | ||||
28 | # By doing this, we save 1 run time check for *every* call to import. | ||||
29 | 2 | 315µs | 2 | 132µs | # spent 80µs (28+52) within constant::BEGIN@29 which was called:
# once (28µs+52µs) by JSON::Backend::XS::BEGIN@9 at line 29 # spent 80µs making 1 call to constant::BEGIN@29
# spent 52µs making 1 call to strict::unimport |
30 | 2 | 54µs | my $const = $] > 5.009002; | ||
31 | *_CAN_PCS = sub () {$const}; | ||||
32 | 1 | 295µs | 1 | 51µs | } # spent 51µs making 1 call to constant::BEGIN@25 |
33 | |||||
34 | #======================================================================= | ||||
35 | # import() - import symbols into user's namespace | ||||
36 | # | ||||
37 | # What we actually do is define a function in the caller's namespace | ||||
38 | # which returns the value. The function we create will normally | ||||
39 | # be inlined as a constant, thereby avoiding further sub calling | ||||
40 | # overhead. | ||||
41 | #======================================================================= | ||||
42 | # spent 708µs (556+153) within constant::import which was called 4 times, avg 177µs/call:
# once (246µs+60µs) by JSON::Backend::XS::BEGIN@9 at line 9 of (eval 12)[JSON.pm:268]
# once (132µs+44µs) by YAML::Syck::BEGIN@36 at line 53 of YAML/Syck.pm
# once (92µs+26µs) by JSON::Backend::XS::BEGIN@11 at line 11 of (eval 12)[JSON.pm:268]
# once (86µs+23µs) by JSON::Backend::XS::BEGIN@18 at line 18 of (eval 12)[JSON.pm:268] | ||||
43 | 44 | 204µs | my $class = shift; | ||
44 | return unless @_; # Ignore 'use constant;' | ||||
45 | my $constants; | ||||
46 | my $multiple = ref $_[0]; | ||||
47 | my $pkg = caller; | ||||
48 | my $flush_mro; | ||||
49 | my $symtab; | ||||
50 | |||||
51 | 4 | 26µs | if (_CAN_PCS) { | ||
52 | 2 | 1.21ms | 2 | 119µs | # spent 77µs (34+42) within constant::BEGIN@52 which was called:
# once (34µs+42µs) by JSON::Backend::XS::BEGIN@9 at line 52 # spent 77µs making 1 call to constant::BEGIN@52
# spent 42µs making 1 call to strict::unimport |
53 | $symtab = \%{$pkg . '::'}; | ||||
54 | }; | ||||
55 | |||||
56 | 8 | 27µs | if ( $multiple ) { | ||
57 | if (ref $_[0] ne 'HASH') { | ||||
58 | require Carp; | ||||
59 | Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'"); | ||||
60 | } | ||||
61 | $constants = shift; | ||||
62 | } else { | ||||
63 | unless (defined $_[0]) { | ||||
64 | require Carp; | ||||
65 | Carp::croak("Can't use undef as constant name"); | ||||
66 | } | ||||
67 | $constants->{+shift} = undef; | ||||
68 | } | ||||
69 | |||||
70 | foreach my $name ( keys %$constants ) { | ||||
71 | # Normal constant name | ||||
72 | 8 | 190µs | 8 | 93µs | if ($name =~ $normal_constant_name and !$forbidden{$name}) { # spent 72µs making 4 calls to constant::CORE:match, avg 18µs/call
# spent 21µs making 4 calls to constant::CORE:regcomp, avg 5µs/call |
73 | # Everything is okay | ||||
74 | |||||
75 | # Name forced into main, but we're not in main. Fatal. | ||||
76 | } elsif ($forced_into_main{$name} and $pkg ne 'main') { | ||||
77 | require Carp; | ||||
78 | Carp::croak("Constant name '$name' is forced into main::"); | ||||
79 | |||||
80 | # Starts with double underscore. Fatal. | ||||
81 | } elsif ($name =~ /^__/) { | ||||
82 | require Carp; | ||||
83 | Carp::croak("Constant name '$name' begins with '__'"); | ||||
84 | |||||
85 | # Maybe the name is tolerable | ||||
86 | } elsif ($name =~ $tolerable) { | ||||
87 | # Then we'll warn only if you've asked for warnings | ||||
88 | if (warnings::enabled()) { | ||||
89 | if ($keywords{$name}) { | ||||
90 | warnings::warn("Constant name '$name' is a Perl keyword"); | ||||
91 | } elsif ($forced_into_main{$name}) { | ||||
92 | warnings::warn("Constant name '$name' is " . | ||||
93 | "forced into package main::"); | ||||
94 | } | ||||
95 | } | ||||
96 | |||||
97 | # Looks like a boolean | ||||
98 | # use constant FRED == fred; | ||||
99 | } elsif ($name =~ $boolean) { | ||||
100 | require Carp; | ||||
101 | if (@_) { | ||||
102 | Carp::croak("Constant name '$name' is invalid"); | ||||
103 | } else { | ||||
104 | Carp::croak("Constant name looks like boolean value"); | ||||
105 | } | ||||
106 | |||||
107 | } else { | ||||
108 | # Must have bad characters | ||||
109 | require Carp; | ||||
110 | Carp::croak("Constant name '$name' has invalid characters"); | ||||
111 | } | ||||
112 | |||||
113 | { | ||||
114 | 2 | 1.54ms | 2 | 146µs | # spent 88µs (30+58) within constant::BEGIN@114 which was called:
# once (30µs+58µs) by JSON::Backend::XS::BEGIN@9 at line 114 # spent 88µs making 1 call to constant::BEGIN@114
# spent 58µs making 1 call to strict::unimport |
115 | 12 | 45µs | my $full_name = "${pkg}::$name"; | ||
116 | $declared{$full_name}++; | ||||
117 | 12 | 161µs | if ($multiple || @_ == 1) { | ||
118 | my $scalar = $multiple ? $constants->{$name} : $_[0]; | ||||
119 | |||||
120 | # Work around perl bug #xxxxx: Sub names (actually glob | ||||
121 | # names in general) ignore the UTF8 flag. So we have to | ||||
122 | # turn it off to get the "right" symbol table entry. | ||||
123 | 4 | 18µs | utf8::is_utf8 $name and utf8::encode $name; # spent 18µs making 4 calls to utf8::is_utf8, avg 4µs/call | ||
124 | |||||
125 | # The constant serves to optimise this entire block out on | ||||
126 | # 5.8 and earlier. | ||||
127 | 12 | 73µs | if (_CAN_PCS && $symtab && !exists $symtab->{$name}) { | ||
128 | # No typeglob yet, so we can use a reference as space- | ||||
129 | # efficient proxy for a constant subroutine | ||||
130 | # The check in Perl_ck_rvconst knows that inlinable | ||||
131 | # constants from cv_const_sv are read only. So we have to: | ||||
132 | 4 | 15µs | Internals::SvREADONLY($scalar, 1); # spent 15µs making 4 calls to Internals::SvREADONLY, avg 4µs/call | ||
133 | $symtab->{$name} = \$scalar; | ||||
134 | ++$flush_mro; | ||||
135 | } else { | ||||
136 | *$full_name = sub () { $scalar }; | ||||
137 | } | ||||
138 | } elsif (@_) { | ||||
139 | my @list = @_; | ||||
140 | *$full_name = sub () { @list }; | ||||
141 | } else { | ||||
142 | *$full_name = sub () { }; | ||||
143 | } | ||||
144 | } | ||||
145 | } | ||||
146 | # Flush the cache exactly once if we make any direct symbol table changes. | ||||
147 | 4 | 27µs | mro::method_changed_in($pkg) if _CAN_PCS && $flush_mro; # spent 27µs making 4 calls to mro::method_changed_in, avg 7µs/call | ||
148 | } | ||||
149 | |||||
150 | 1 | 44µs | 1; | ||
151 | |||||
152 | __END__ | ||||
# spent 72µs within constant::CORE:match which was called 4 times, avg 18µs/call:
# 4 times (72µs+0s) by constant::import at line 72, avg 18µs/call | |||||
sub constant::CORE:qr; # opcode | |||||
# spent 134µs within constant::CORE:regcomp which was called 7 times, avg 19µs/call:
# 4 times (21µs+0s) by constant::import at line 72, avg 5µs/call
# once (74µs+0s) by JSON::Backend::XS::BEGIN@9 at line 21
# once (20µs+0s) by JSON::Backend::XS::BEGIN@9 at line 23
# once (19µs+0s) by JSON::Backend::XS::BEGIN@9 at line 22 |