10 unlink "XSLoader.pm" if -f "XSLoader.pm";
11 open OUT, ">XSLoader.pm" or die $!;
13 # Generated from XSLoader.pm.PL (resolved %Config::Config value)
17 # And Gandalf said: 'Many folk like to know beforehand what is to
18 # be set on the table; but those who have laboured to prepare the
19 # feast like to keep their secret; for wonder makes the words of
22 # (Quote from Tolkien sugested by Anno Siegel.)
24 # See pod text at end of file for documentation.
25 # See also ext/DynaLoader/README in source tree for other information.
27 # Tim.Bunce@ig.co.uk, August 1994
29 $VERSION = "0.01"; # avoid typo warning
31 # enable debug/trace messages from DynaLoader perl code
32 # $dl_debug = $ENV{PERL_DL_DEBUG} || 0 unless defined $dl_debug;
36 print OUT ' my $dl_dlext = ', to_string($Config::Config{'dlext'}), ";\n" ;
42 # No prizes for guessing why we don't say 'bootstrap DynaLoader;' here.
43 # NOTE: All dl_*.xs (including dl_none.xs) define a dl_error() XSUB
44 boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) &&
50 # The bootstrap function cannot be autoloaded (without complications)
51 # so we define it here:
58 # work with static linking too
59 my $b = "$module\::bootstrap";
60 goto &$b if defined &$b;
62 goto retry unless $module and defined &dl_load_file;
64 my @modparts = split(/::/,$module);
65 my $modfname = $modparts[-1];
69 print OUT <<'EOT' if defined &DynaLoader::mod2fname;
70 # Some systems have restrictions on files names for DLL's etc.
71 # mod2fname returns appropriate file base name (typically truncated)
72 # It may also edit @modparts if required.
73 $modfname = &mod2fname(\@modparts) if defined &mod2fname;
78 my $modpname = join('/',@modparts);
79 my $modlibname = (caller())[1];
81 $modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename
82 my $file = "$modlibname/auto/$modpname/$modfname.$dl_dlext";
84 # print STDERR "XSLoader::load for $module ($file)\n" if $dl_debug;
87 $bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library
89 goto retry if not -f $file or -s $bs;
91 my $bootname = "boot_$module";
92 $bootname =~ s/\W/_/g;
93 @dl_require_symbols = ($bootname);
95 # Many dynamic extension loading problems will appear to come from
96 # this section of code: XYZ failed at line 123 of DynaLoader.pm.
97 # Often these errors are actually occurring in the initialisation
98 # C code of the extension XS file. Perl reports the error as being
99 # in this perl code simply because this was the last perl code
102 my $libref = dl_load_file($file, 0) or do {
104 Carp::croak("Can't load '$file' for module $module: " . dl_error());
106 push(@dl_librefs,$libref); # record loaded object
108 my @unresolved = dl_undef_symbols();
111 Carp::carp("Undefined symbols present after loading $file: @unresolved\n");
114 my $boot_symbol_ref = dl_find_symbol($libref, $bootname) or do {
116 Carp::croak("Can't find '$bootname' symbol in $file\n");
119 my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file);
121 push(@dl_modules, $module); # record loaded module
123 # See comment block above
128 goto &DynaLoader::bootstrap_inherit;
135 XSLoader - Dynamically load C libraries into Perl code
142 XSLoader::load 'YourPackage', @args;
146 This module defines a standard I<simplified> interface to the dynamic
147 linking mechanisms available on many platforms. Its primary purpose is
148 to implement cheap automatic dynamic loading of Perl modules.
150 For more complicated interface see L<DynaLoader>.
154 Ilya Zakharevich: extraction from DynaLoader.