Profile of DynaLoader.pm

Filename	/usr/lib/perl/5.10/DynaLoader.pm
Statements	Executed 150 statements in 3.82ms

Subroutines
Calls	P	F	Exclusive Time	Inclusive Time	Subroutine
1	1	1	837µs	966µs	DynaLoader::::BEGIN@24DynaLoader::BEGIN@24
3	1	1	832µs	832µs	DynaLoader::::dl_load_fileDynaLoader::dl_load_file (xsub)
3	3	3	470µs	1.89ms	DynaLoader::::bootstrapDynaLoader::bootstrap
16	1	1	105µs	105µs	DynaLoader::::CORE:ftdirDynaLoader::CORE:ftdir (opcode)
6	2	1	99µs	99µs	DynaLoader::::CORE:substDynaLoader::CORE:subst (opcode)
3	1	1	37µs	37µs	DynaLoader::::dl_install_xsubDynaLoader::dl_install_xsub (xsub)
3	1	1	20µs	20µs	DynaLoader::::CORE:ftsizeDynaLoader::CORE:ftsize (opcode)
3	1	1	18µs	18µs	DynaLoader::::CORE:ftfileDynaLoader::CORE:ftfile (opcode)
1	1	1	16µs	16µs	DynaLoader::::BEGIN@17DynaLoader::BEGIN@17
3	1	1	13µs	13µs	DynaLoader::::dl_find_symbolDynaLoader::dl_find_symbol (xsub)
3	1	1	9µs	9µs	DynaLoader::::dl_load_flagsDynaLoader::dl_load_flags
3	1	1	8µs	8µs	DynaLoader::::dl_undef_symbolsDynaLoader::dl_undef_symbols (xsub)
0	0	0	0s	0s	DynaLoader::::bootstrap_inheritDynaLoader::bootstrap_inherit
0	0	0	0s	0s	DynaLoader::::croakDynaLoader::croak

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

Line	State ments	Time on line	Calls	Time in subs	Code
1					# Generated from DynaLoader_pm.PL
2
3					package DynaLoader;
4
5					# And Gandalf said: 'Many folk like to know beforehand what is to
6					# be set on the table; but those who have laboured to prepare the
7					# feast like to keep their secret; for wonder makes the words of
8					# praise louder.'
9
10					# (Quote from Tolkien suggested by Anno Siegel.)
11					#
12					# See pod text at end of file for documentation.
13					# See also ext/DynaLoader/README in source tree for other information.
14					#
15					# Tim.Bunce@ig.co.uk, August 1994
16
17					# spent 16µs within DynaLoader::BEGIN@17 which was called: # once (16µs+0s) by MARC::Charset::BEGIN@10 at line 19 BEGIN {
18	1	8µs			$VERSION = '1.10';
19	1	50µs	1	16µs	} # spent 16µs making 1 call to DynaLoader::BEGIN@17
20
21	1	166µs			require AutoLoader;
22	1	3µs			*AUTOLOAD = \&AutoLoader::AUTOLOAD;
23
24	3	1.57ms	2	987µs	# spent 966µs (837+129) within DynaLoader::BEGIN@24 which was called: # once (837µs+129µs) by MARC::Charset::BEGIN@10 at line 24 use Config; # spent 966µs making 1 call to DynaLoader::BEGIN@24 # spent 21µs making 1 call to Config::import
25
26					# enable debug/trace messages from DynaLoader perl code
27	1	3µs			$dl_debug = $ENV{PERL_DL_DEBUG} \|\| 0 unless defined $dl_debug;
28
29					#
30					# Flags to alter dl_load_file behaviour. Assigned bits:
31					# 0x01 make symbols available for linking later dl_load_file's.
32					# (only known to work on Solaris 2 using dlopen(RTLD_GLOBAL))
33					# (ignored under VMS; effect is built-in to image linking)
34					#
35					# This is called as a class method $module->dl_load_flags. The
36					# definition here will be inherited and result on "default" loading
37					# behaviour unless a sub-class of DynaLoader defines its own version.
38					#
39
40	3	15µs			# spent 9µs within DynaLoader::dl_load_flags which was called 3 times, avg 3µs/call: # 3 times (9µs+0s) by DynaLoader::bootstrap at line 192, avg 3µs/call sub dl_load_flags { 0x00 }
41
42	1	38µs	3	3.61ms	($dl_dlext, $dl_so, $dlsrc) = @Config::Config{qw(dlext so dlsrc)}; # spent 3.61ms making 3 calls to Config::FETCH, avg 1.20ms/call
43
44	1	2µs			$do_expand = 0;
45
46	1	2µs			@dl_require_symbols = (); # names of symbols we need
47	1	1µs			@dl_resolve_using = (); # names of files to link with
48	1	1µs			@dl_library_path = (); # path to look for files
49
50					#XSLoader.pm may have added elements before we were required
51					#@dl_shared_objects = (); # shared objects for symbols we have
52					#@dl_librefs = (); # things we have loaded
53					#@dl_modules = (); # Modules we have loaded
54
55					# This is a fix to support DLD's unfortunate desire to relink -lc
56	1	1µs			@dl_resolve_using = dl_findfile('-lc') if $dlsrc eq "dl_dld.xs";
57
58					# Initialise @dl_library_path with the 'standard' library path
59					# for this platform as determined by Configure.
60
61	1	14µs	1	5µs	push(@dl_library_path, split(' ', $Config::Config{libpth})); # spent 5µs making 1 call to Config::FETCH
62
63	1	8µs	1	5µs	my $ldlibpthname = $Config::Config{ldlibpthname}; # spent 5µs making 1 call to Config::FETCH
64	1	9µs	1	6µs	my $ldlibpthname_defined = defined $Config::Config{ldlibpthname}; # spent 6µs making 1 call to Config::FETCH
65	1	8µs	1	5µs	my $pthsep = $Config::Config{path_sep}; # spent 5µs making 1 call to Config::FETCH
66
67					# Add to @dl_library_path any extra directories we can gather from environment
68					# during runtime.
69
70	1	2µs			if ($ldlibpthname_defined &&
71					exists $ENV{$ldlibpthname}) {
72					push(@dl_library_path, split(/$pthsep/, $ENV{$ldlibpthname}));
73					}
74
75					# E.g. HP-UX supports both its native SHLIB_PATH and LD_LIBRARY_PATH.
76
77	1	2µs			if ($ldlibpthname_defined &&
78					$ldlibpthname ne 'LD_LIBRARY_PATH' &&
79					exists $ENV{LD_LIBRARY_PATH}) {
80					push(@dl_library_path, split(/$pthsep/, $ENV{LD_LIBRARY_PATH}));
81					}
82
83					# No prizes for guessing why we don't say 'bootstrap DynaLoader;' here.
84					# NOTE: All dl_*.xs (including dl_none.xs) define a dl_error() XSUB
85	1	2µs			boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) &&
86					!defined(&dl_error);
87
88	1	1µs			if ($dl_debug) {
89					print STDERR "DynaLoader.pm loaded (@INC, @dl_library_path)\n";
90					print STDERR "DynaLoader not linked into this perl\n"
91					unless defined(&boot_DynaLoader);
92					}
93
94	1	35µs			1; # End of main code
95
96					sub croak { require Carp; Carp::croak(@_) }
97
98					sub bootstrap_inherit {
99					my $module = $_[0];
100					local isa = {"$module\::ISA"};
101					local @isa = (@isa, 'DynaLoader');
102					# Cannot goto due to delocalization. Will report errors on a wrong line?
103					bootstrap(@_);
104					}
105
106					# The bootstrap function cannot be autoloaded (without complications)
107					# so we define it here:
108
109					# spent 1.89ms (470µs+1.42) within DynaLoader::bootstrap which was called 3 times, avg 631µs/call: # once (178µs+737µs) by MARC::Charset::BEGIN@10 at line 42 of Unicode/Normalize.pm # once (143µs+425µs) by XML::Parser::BEGIN@13 at line 29 of XML/Parser/Expat.pm # once (149µs+260µs) by MARC::Charset::Table::BEGIN@40 at line 67 of Storable.pm sub bootstrap {
110					# use local vars to enable $module.bs script to edit values
111	125	1.88ms			local(@args) = @_;
112					local($module) = $args[0];
113					local(@dirs, $file);
114
115					unless ($module) {
116					require Carp;
117					Carp::confess("Usage: DynaLoader::bootstrap(module)");
118					}
119
120					# A common error on platforms which don't support dynamic loading.
121					# Since it's fatal and potentially confusing we give a detailed message.
122					croak("Can't load module $module, dynamic loading not available in this perl.\n".
123					" (You may need to build a new perl executable which either supports\n".
124					" dynamic loading or has the $module module statically linked into it.)\n")
125					unless defined(&dl_load_file);
126
127
128					my @modparts = split(/::/,$module);
129					my $modfname = $modparts[-1];
130
131					# Some systems have restrictions on files names for DLL's etc.
132					# mod2fname returns appropriate file base name (typically truncated)
133					# It may also edit @modparts if required.
134					$modfname = &mod2fname(\@modparts) if defined &mod2fname;
135
136
137
138					my $modpname = join('/',@modparts);
139
140					print STDERR "DynaLoader::bootstrap for $module ",
141					"(auto/$modpname/$modfname.$dl_dlext)\n"
142					if $dl_debug;
143
144					foreach (@INC) {
145
146
147					my $dir = "$_/auto/$modpname";
148
149
150			16	105µs	next unless -d $dir; # skip over uninteresting directories # spent 105µs making 16 calls to DynaLoader::CORE:ftdir, avg 7µs/call
151
152					# check for common cases to avoid autoload of dl_findfile
153					my $try = "$dir/$modfname.$dl_dlext";
154			3	18µs	last if $file = ($do_expand) ? dl_expandspec($try) : ((-f $try) && $try); # spent 18µs making 3 calls to DynaLoader::CORE:ftfile, avg 6µs/call
155
156					# no luck here, save dir for possible later dl_findfile search
157					push @dirs, $dir;
158					}
159					# last resort, let dl_findfile have a go in all known locations
160					$file = dl_findfile(map("-L$_",@dirs,@INC), $modfname) unless $file;
161
162					croak("Can't locate loadable object for module $module in \@INC (\@INC contains: @INC)")
163					unless $file; # wording similar to error from 'require'
164
165
166					my $bootname = "boot_$module";
167			3	12µs	$bootname =~ s/\W/_/g; # spent 12µs making 3 calls to DynaLoader::CORE:subst, avg 4µs/call
168					@dl_require_symbols = ($bootname);
169
170					# Execute optional '.bootstrap' perl script for this module.
171					# The .bs file can be used to configure @dl_resolve_using etc to
172					# match the needs of the individual module on this architecture.
173					my $bs = $file;
174			3	87µs	$bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library # spent 87µs making 3 calls to DynaLoader::CORE:subst, avg 29µs/call
175			3	20µs	if (-s $bs) { # only read file if it's not empty # spent 20µs making 3 calls to DynaLoader::CORE:ftsize, avg 7µs/call
176					print STDERR "BS: $bs ($^O, $dlsrc)\n" if $dl_debug;
177					eval { do $bs; };
178					warn "$bs: $@\n" if $@;
179					}
180
181					my $boot_symbol_ref;
182
183
184
185					# Many dynamic extension loading problems will appear to come from
186					# this section of code: XYZ failed at line 123 of DynaLoader.pm.
187					# Often these errors are actually occurring in the initialisation
188					# C code of the extension XS file. Perl reports the error as being
189					# in this perl code simply because this was the last perl code
190					# it executed.
191
192			6	841µs	my $libref = dl_load_file($file, $module->dl_load_flags) or # spent 832µs making 3 calls to DynaLoader::dl_load_file, avg 277µs/call # spent 9µs making 3 calls to DynaLoader::dl_load_flags, avg 3µs/call
193					croak("Can't load '$file' for module $module: ".dl_error());
194
195					push(@dl_librefs,$libref); # record loaded object
196
197			3	8µs	my @unresolved = dl_undef_symbols(); # spent 8µs making 3 calls to DynaLoader::dl_undef_symbols, avg 3µs/call
198					if (@unresolved) {
199					require Carp;
200					Carp::carp("Undefined symbols present after loading $file: @unresolved\n");
201					}
202
203			3	13µs	$boot_symbol_ref = dl_find_symbol($libref, $bootname) or # spent 13µs making 3 calls to DynaLoader::dl_find_symbol, avg 4µs/call
204					croak("Can't find '$bootname' symbol in $file\n");
205
206					push(@dl_modules, $module); # record loaded module
207
208			3	37µs	boot: # spent 37µs making 3 calls to DynaLoader::dl_install_xsub, avg 12µs/call
209					my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file);
210
211					# See comment block above
212
213					push(@dl_shared_objects, $file); # record files loaded
214
215			3	281µs	&$xs(@args); # spent 108µs making 1 call to Unicode::Normalize::bootstrap # spent 94µs making 1 call to XML::Parser::Expat::bootstrap # spent 79µs making 1 call to Storable::bootstrap
216					}
217
218					#sub _check_file { # private utility to handle dl_expandspec vs -f tests
219					# my($file) = @_;
220					# return $file if (!$do_expand && -f $file); # the common case
221					# return $file if ( $do_expand && ($file=dl_expandspec($file)));
222					# return undef;
223					#}
224
225					# Let autosplit and the autoloader deal with these functions:

					# spent 105µs within DynaLoader::CORE:ftdir which was called 16 times, avg 7µs/call: # 16 times (105µs+0s) by DynaLoader::bootstrap at line 150, avg 7µs/call sub DynaLoader::CORE:ftdir; # opcode
					# spent 18µs within DynaLoader::CORE:ftfile which was called 3 times, avg 6µs/call: # 3 times (18µs+0s) by DynaLoader::bootstrap at line 154, avg 6µs/call sub DynaLoader::CORE:ftfile; # opcode
					# spent 20µs within DynaLoader::CORE:ftsize which was called 3 times, avg 7µs/call: # 3 times (20µs+0s) by DynaLoader::bootstrap at line 175, avg 7µs/call sub DynaLoader::CORE:ftsize; # opcode
					# spent 99µs within DynaLoader::CORE:subst which was called 6 times, avg 16µs/call: # 3 times (87µs+0s) by DynaLoader::bootstrap at line 174, avg 29µs/call # 3 times (12µs+0s) by DynaLoader::bootstrap at line 167, avg 4µs/call sub DynaLoader::CORE:subst; # opcode
					# spent 13µs within DynaLoader::dl_find_symbol which was called 3 times, avg 4µs/call: # 3 times (13µs+0s) by DynaLoader::bootstrap at line 203, avg 4µs/call sub DynaLoader::dl_find_symbol; # xsub
					# spent 37µs within DynaLoader::dl_install_xsub which was called 3 times, avg 12µs/call: # 3 times (37µs+0s) by DynaLoader::bootstrap at line 208, avg 12µs/call sub DynaLoader::dl_install_xsub; # xsub
					# spent 832µs within DynaLoader::dl_load_file which was called 3 times, avg 277µs/call: # 3 times (832µs+0s) by DynaLoader::bootstrap at line 192, avg 277µs/call sub DynaLoader::dl_load_file; # xsub
					# spent 8µs within DynaLoader::dl_undef_symbols which was called 3 times, avg 3µs/call: # 3 times (8µs+0s) by DynaLoader::bootstrap at line 197, avg 3µs/call sub DynaLoader::dl_undef_symbols; # xsub