Profile of constant.pm

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For t/optimization.t
Run on Thu Jan 8 22:47:42 2015
Reported on Thu Jan 8 22:48:05 2015

Filename | /home/ss5/perl5/perlbrew/perls/tapper-perl/lib/5.16.3/constant.pm
Statements | Executed 319 statements in 1.93ms

Subroutines
Calls | P | F | Exclusive Time | Inclusive Time | Subroutine
--- | --- | --- | --- | --- | ---
4 | 4 | 4 | 341µs | 426µs | constant::::importconstant::import
1 | 1 | 1 | 188µs | 13.1ms | constant::::BEGIN@25constant::BEGIN@25
1 | 1 | 1 | 184µs | 184µs | constant::::BEGIN@36constant::BEGIN@36
26 | 4 | 1 | 48µs | 48µs | constant::::CORE:regcompconstant::CORE:regcomp (opcode)
23 | 1 | 1 | 41µs | 41µs | constant::::CORE:matchconstant::CORE:match (opcode)
1 | 1 | 1 | 18µs | 18µs | constant::::BEGIN@2constant::BEGIN@2
1 | 1 | 1 | 14µs | 31µs | constant::::BEGIN@65constant::BEGIN@65
1 | 1 | 1 | 13µs | 151µs | constant::::BEGIN@4constant::BEGIN@4
1 | 1 | 1 | 12µs | 28µs | constant::::BEGIN@3constant::BEGIN@3
1 | 1 | 1 | 12µs | 54µs | constant::::BEGIN@6constant::BEGIN@6
1 | 1 | 1 | 10µs | 22µs | constant::::BEGIN@127constant::BEGIN@127
1 | 1 | 1 | 10µs | 24µs | constant::::BEGIN@29constant::BEGIN@29
3 | 3 | 1 | 8µs | 8µs | constant::::CORE:qrconstant::CORE:qr (opcode)
0 | 0 | 0 | 0s | 0s | constant::::__ANON__[:151]constant::__ANON__[:151]
0 | 0 | 0 | 0s | 0s | constant::::__ANON__[:155]constant::__ANON__[:155]
0 | 0 | 0 | 0s | 0s | constant::::__ANON__[:157]constant::__ANON__[:157]
0 | 0 | 0 | 0s | 0s | constant::::__ANON__[:31]constant::__ANON__[:31]

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

Line | State ments | Time on line | Calls | Time in subs | Code
--- | --- | --- | --- | --- | ---
1 |  |  |  |  | package constant;
2 | 2 | 53µs | 1 | 18µs | # spent 18µs within constant::BEGIN@2 which was called: # once (18µs+0s) by Data::Dumper::BEGIN@270 at line 2 use 5.005; # spent 18µs making 1 call to constant::BEGIN@2
3 | 2 | 30µs | 2 | 44µs | # spent 28µs (12+16) within constant::BEGIN@3 which was called: # once (12µs+16µs) by Data::Dumper::BEGIN@270 at line 3 use strict; # spent 28µs making 1 call to constant::BEGIN@3 # spent 16µs making 1 call to strict::import
4 | 2 | 35µs | 2 | 288µs | # spent 151µs (13+138) within constant::BEGIN@4 which was called: # once (13µs+138µs) by Data::Dumper::BEGIN@270 at line 4 use warnings::register; # spent 151µs making 1 call to constant::BEGIN@4 # spent 138µs making 1 call to warnings::register::import
5 |  |  |  |  |
6 | 2 | 127µs | 2 | 97µs | # spent 54µs (12+43) within constant::BEGIN@6 which was called: # once (12µs+43µs) by Data::Dumper::BEGIN@270 at line 6 use vars qw($VERSION %declared); # spent 54µs making 1 call to constant::BEGIN@6 # spent 43µs making 1 call to vars::import
7 | 1 | 600ns |  |  | $VERSION = '1.23';
8 |  |  |  |  |
9 |  |  |  |  | #=======================================================================
10 |  |  |  |  |
11 |  |  |  |  | # Some names are evil choices.
12 | 1 | 7µs |  |  | my %keywords = map +($_, 1), qw{ BEGIN INIT CHECK END DESTROY AUTOLOAD };
13 | 1 | 2µs |  |  | $keywords{UNITCHECK}++ if $] > 5.009;
14 |  |  |  |  |
15 | 1 | 6µs |  |  | my %forced_into_main = map +($_, 1),
16 |  |  |  |  | qw{ STDIN STDOUT STDERR ARGV ARGVOUT ENV INC SIG };
17 |  |  |  |  |
18 | 1 | 7µs |  |  | my %forbidden = (%keywords, %forced_into_main);
19 |  |  |  |  |
20 | 1 | 800ns |  |  | my $str_end = $] >= 5.006 ? "\\z" : "\\Z";
21 | 1 | 38µs | 2 | 25µs | my $normal_constant_name = qr/^_?[^\W_0-9]\w*$str_end/; # spent 19µs making 1 call to constant::CORE:regcomp # spent 6µs making 1 call to constant::CORE:qr
22 | 1 | 13µs | 2 | 7µs | my $tolerable = qr/^[A-Za-z_]\w*$str_end/; # spent 6µs making 1 call to constant::CORE:regcomp # spent 1µs making 1 call to constant::CORE:qr
23 | 1 | 12µs | 2 | 6µs | my $boolean = qr/^[01]?$str_end/; # spent 5µs making 1 call to constant::CORE:regcomp # spent 1µs making 1 call to constant::CORE:qr
24 |  |  |  |  |
25 |  |  |  |  | # spent 13.1ms (188µs+12.9) within constant::BEGIN@25 which was called: # once (188µs+12.9ms) by Data::Dumper::BEGIN@270 at line 45 BEGIN {
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 | 155µs | 2 | 38µs | # spent 24µs (10+14) within constant::BEGIN@29 which was called: # once (10µs+14µs) by Data::Dumper::BEGIN@270 at line 29 no strict 'refs'; # spent 24µs making 1 call to constant::BEGIN@29 # spent 14µs making 1 call to strict::unimport
30 | 1 | 2µs |  |  | my $const = $] > 5.009002;
31 | 1 | 6µs |  |  | *_CAN_PCS = sub () {$const};
32 |  |  |  |  |
33 |  |  |  |  | # Before this makes its way into a dev perl release, we have to do
34 |  |  |  |  | # browser-sniffing, as it were....
35 | 1 | 200ns |  |  | return unless $const;
36 | 3 | 326µs | 1 | 3.09ms | # spent 184µs within constant::BEGIN@36 which was called: # once (184µs+0s) by constant::BEGIN@25 at line 45 *{chr 256} = \3; # spent 3.09ms making 1 call to utf8::AUTOLOAD
37 | 1 | 6µs |  |  | if (exists ${__PACKAGE__."::"}{"\xc4\x80"}) {
38 |  |  |  |  | delete ${__PACKAGE__."::"}{"\xc4\x80"};
39 |  |  |  |  | *_DOWNGRADE = sub () {1};
40 |  |  |  |  | }
41 |  |  |  |  | else {
42 | 1 | 3µs |  |  | delete ${__PACKAGE__."::"}{chr 256};
43 | 1 | 2µs |  |  | *_DOWNGRADE = sub () {0};
44 |  |  |  |  | }
45 | 1 | 103µs | 2 | 13.3ms | } # spent 13.1ms making 1 call to constant::BEGIN@25 # spent 184µs making 1 call to constant::BEGIN@36
46 |  |  |  |  |
47 |  |  |  |  | #=======================================================================
48 |  |  |  |  | # import() - import symbols into user's namespace
49 |  |  |  |  | #
50 |  |  |  |  | # What we actually do is define a function in the caller's namespace
51 |  |  |  |  | # which returns the value. The function we create will normally
52 |  |  |  |  | # be inlined as a constant, thereby avoiding further sub calling
53 |  |  |  |  | # overhead.
54 |  |  |  |  | #=======================================================================
55 |  |  |  |  | # spent 426µs (341+84) within constant::import which was called 4 times, avg 106µs/call: # once (141µs+33µs) by Data::DPath::Context::BEGIN@52 at line 52 of lib/Data/DPath/Context.pm # once (107µs+27µs) by Data::DPath::Path::BEGIN@21 at line 21 of lib/Data/DPath/Path.pm # once (51µs+14µs) by Data::DPath::Filters::BEGIN@9 at line 10 of lib/Data/DPath/Filters.pm # once (42µs+10µs) by Data::Dumper::BEGIN@270 at line 270 of Data/Dumper.pm sub import {
56 | 4 | 3µs |  |  | my $class = shift;
57 | 4 | 2µs |  |  | return unless @_; # Ignore 'use constant;'
58 | 4 | 900ns |  |  | my $constants;
59 | 4 | 4µs |  |  | my $multiple = ref $_[0];
60 | 4 | 3µs |  |  | my $pkg = caller;
61 | 4 | 700ns |  |  | my $flush_mro;
62 | 4 | 700ns |  |  | my $symtab;
63 |  |  |  |  |
64 | 4 | 2µs |  |  | if (_CAN_PCS) {
65 | 2 | 271µs | 2 | 49µs | # spent 31µs (14+18) within constant::BEGIN@65 which was called: # once (14µs+18µs) by Data::Dumper::BEGIN@270 at line 65 no strict 'refs'; # spent 31µs making 1 call to constant::BEGIN@65 # spent 18µs making 1 call to strict::unimport
66 | 4 | 8µs |  |  | $symtab = \%{$pkg . '::'};
67 |  |  |  |  | };
68 |  |  |  |  |
69 | 4 | 2µs |  |  | if ( $multiple ) {
70 | 3 | 2µs |  |  | if (ref $_[0] ne 'HASH') {
71 |  |  |  |  | require Carp;
72 |  |  |  |  | Carp::croak("Invalid reference type '".ref(shift)."' not 'HASH'");
73 |  |  |  |  | }
74 | 3 | 1µs |  |  | $constants = shift;
75 |  |  |  |  | } else {
76 | 1 | 400ns |  |  | unless (defined $_[0]) {
77 |  |  |  |  | require Carp;
78 |  |  |  |  | Carp::croak("Can't use undef as constant name");
79 |  |  |  |  | }
80 | 1 | 1µs |  |  | $constants->{+shift} = undef;
81 |  |  |  |  | }
82 |  |  |  |  |
83 | 4 | 12µs |  |  | foreach my $name ( keys %$constants ) {
84 |  |  |  |  | # Normal constant name
85 | 23 | 158µs | 46 | 59µs | if ($name =~ $normal_constant_name and !$forbidden{$name}) { # spent 41µs making 23 calls to constant::CORE:match, avg 2µs/call # spent 18µs making 23 calls to constant::CORE:regcomp, avg 787ns/call
86 |  |  |  |  | # Everything is okay
87 |  |  |  |  |
88 |  |  |  |  | # Name forced into main, but we're not in main. Fatal.
89 |  |  |  |  | } elsif ($forced_into_main{$name} and $pkg ne 'main') {
90 |  |  |  |  | require Carp;
91 |  |  |  |  | Carp::croak("Constant name '$name' is forced into main::");
92 |  |  |  |  |
93 |  |  |  |  | # Starts with double underscore. Fatal.
94 |  |  |  |  | } elsif ($name =~ /^__/) {
95 |  |  |  |  | require Carp;
96 |  |  |  |  | Carp::croak("Constant name '$name' begins with '__'");
97 |  |  |  |  |
98 |  |  |  |  | # Maybe the name is tolerable
99 |  |  |  |  | } elsif ($name =~ $tolerable) {
100 |  |  |  |  | # Then we'll warn only if you've asked for warnings
101 |  |  |  |  | if (warnings::enabled()) {
102 |  |  |  |  | if ($keywords{$name}) {
103 |  |  |  |  | warnings::warn("Constant name '$name' is a Perl keyword");
104 |  |  |  |  | } elsif ($forced_into_main{$name}) {
105 |  |  |  |  | warnings::warn("Constant name '$name' is " .
106 |  |  |  |  | "forced into package main::");
107 |  |  |  |  | }
108 |  |  |  |  | }
109 |  |  |  |  |
110 |  |  |  |  | # Looks like a boolean
111 |  |  |  |  | # use constant FRED == fred;
112 |  |  |  |  | } elsif ($name =~ $boolean) {
113 |  |  |  |  | require Carp;
114 |  |  |  |  | if (@_) {
115 |  |  |  |  | Carp::croak("Constant name '$name' is invalid");
116 |  |  |  |  | } else {
117 |  |  |  |  | Carp::croak("Constant name looks like boolean value");
118 |  |  |  |  | }
119 |  |  |  |  |
120 |  |  |  |  | } else {
121 |  |  |  |  | # Must have bad characters
122 |  |  |  |  | require Carp;
123 |  |  |  |  | Carp::croak("Constant name '$name' has invalid characters");
124 |  |  |  |  | }
125 |  |  |  |  |
126 |  |  |  |  | {
127 | 25 | 301µs | 2 | 35µs | # spent 22µs (10+13) within constant::BEGIN@127 which was called: # once (10µs+13µs) by Data::Dumper::BEGIN@270 at line 127 no strict 'refs'; # spent 22µs making 1 call to constant::BEGIN@127 # spent 13µs making 1 call to strict::unimport
128 | 23 | 18µs |  |  | my $full_name = "${pkg}::$name";
129 | 23 | 22µs |  |  | $declared{$full_name}++;
130 | 23 | 11µs |  |  | if ($multiple || @_ == 1) {
131 | 23 | 12µs |  |  | my $scalar = $multiple ? $constants->{$name} : $_[0];
132 |  |  |  |  |
133 |  |  |  |  | if (_DOWNGRADE) { # for 5.10 to 5.14
134 |  |  |  |  | # Work around perl bug #31991: Sub names (actually glob
135 |  |  |  |  | # names in general) ignore the UTF8 flag. So we have to
136 |  |  |  |  | # turn it off to get the "right" symbol table entry.
137 |  |  |  |  | utf8::is_utf8 $name and utf8::encode $name;
138 |  |  |  |  | }
139 |  |  |  |  |
140 |  |  |  |  | # The constant serves to optimise this entire block out on
141 |  |  |  |  | # 5.8 and earlier.
142 | 23 | 18µs |  |  | if (_CAN_PCS && $symtab && !exists $symtab->{$name}) {
143 |  |  |  |  | # No typeglob yet, so we can use a reference as space-
144 |  |  |  |  | # efficient proxy for a constant subroutine
145 |  |  |  |  | # The check in Perl_ck_rvconst knows that inlinable
146 |  |  |  |  | # constants from cv_const_sv are read only. So we have to:
147 | 23 | 72µs | 23 | 18µs | Internals::SvREADONLY($scalar, 1); # spent 18µs making 23 calls to Internals::SvREADONLY, avg 791ns/call
148 | 23 | 17µs |  |  | $symtab->{$name} = \$scalar;
149 | 23 | 8µs |  |  | ++$flush_mro;
150 |  |  |  |  | } else {
151 |  |  |  |  | *$full_name = sub () { $scalar };
152 |  |  |  |  | }
153 |  |  |  |  | } elsif (@_) {
154 |  |  |  |  | my @list = @_;
155 |  |  |  |  | *$full_name = sub () { @list };
156 |  |  |  |  | } else {
157 |  |  |  |  | *$full_name = sub () { };
158 |  |  |  |  | }
159 |  |  |  |  | }
160 |  |  |  |  | }
161 |  |  |  |  | # Flush the cache exactly once if we make any direct symbol table changes.
162 | 4 | 39µs | 4 | 7µs | mro::method_changed_in($pkg) if _CAN_PCS && $flush_mro; # spent 7µs making 4 calls to mro::method_changed_in, avg 2µs/call
163 |  |  |  |  | }
164 |  |  |  |  |
165 | 1 | 12µs |  |  | 1;
166 |  |  |  |  |
167 |  |  |  |  | __END__
|  |  |  |  | # spent 41µs within constant::CORE:match which was called 23 times, avg 2µs/call: # 23 times (41µs+0s) by constant::import at line 85, avg 2µs/call sub constant::CORE:match; # opcode
|  |  |  |  | # spent 8µs within constant::CORE:qr which was called 3 times, avg 3µs/call: # once (6µs+0s) by Data::Dumper::BEGIN@270 at line 21 # once (1µs+0s) by Data::Dumper::BEGIN@270 at line 22 # once (1µs+0s) by Data::Dumper::BEGIN@270 at line 23 sub constant::CORE:qr; # opcode
|  |  |  |  | # spent 48µs within constant::CORE:regcomp which was called 26 times, avg 2µs/call: # 23 times (18µs+0s) by constant::import at line 85, avg 787ns/call # once (19µs+0s) by Data::Dumper::BEGIN@270 at line 21 # once (6µs+0s) by Data::Dumper::BEGIN@270 at line 22 # once (5µs+0s) by Data::Dumper::BEGIN@270 at line 23 sub constant::CORE:regcomp; # opcode