154 lines
4.4 KiB
Perl
154 lines
4.4 KiB
Perl
#!/usr/bin/perl -w
|
|
|
|
# This script takes two arguments, a version script and a dynamic library
|
|
# (in that order), and prints a list of symbols to be exported from the
|
|
# library.
|
|
# It expects a 'nm' with the POSIX '-P' option, but everyone has one of
|
|
# those, right? It also expects that symbol names have a leading underscore,
|
|
# which is somewhat less likely.
|
|
|
|
use File::Glob ':glob';
|
|
use FileHandle;
|
|
use IPC::Open2;
|
|
|
|
# The glob patterns that are to be applied to the demangled name
|
|
my @cxx_globs = ();
|
|
# The glob patterns that apply directly to the name in the .o files
|
|
my @globs = ();
|
|
# The patterns for local variables (usually just '*').
|
|
my @ignored = ();
|
|
|
|
##########
|
|
# Fill in the various glob arrays.
|
|
|
|
# The next pattern will go into this array.
|
|
my $glob = \@globs;
|
|
my $symvers = shift;
|
|
|
|
open F,$symvers or die $!;
|
|
|
|
while (<F>) {
|
|
chomp;
|
|
# Lines of the form '} SOME_VERSION_NAME_1.0;'
|
|
if (/^[ \t]*\}[ \tA-Z0-9_.a-z]*;[ \t]*$/) {
|
|
$glob = \@globs;
|
|
next;
|
|
}
|
|
# Comment and blank lines
|
|
next if (/^[ \t]*\#/);
|
|
next if (/^[ \t]*$/);
|
|
# Lines of the form 'SOME_VERSION_NAME_1.1 {'
|
|
next if (/^[A-Z0-9_. \t]*{$/);
|
|
# Ignore 'global:'
|
|
next if (/^[ \t]*global:$/);
|
|
# After 'local:', globs should be ignored, they won't be exported.
|
|
if (/^[ \t]*local:$/) {
|
|
$glob = \@ignored;
|
|
next;
|
|
}
|
|
# After 'extern "C++"', globs are C++ patterns
|
|
if (/^[ \t]*extern \"C\+\+\"[ \t]*$/) {
|
|
$glob = \@cxx_globs;
|
|
next;
|
|
}
|
|
# Catch globs. Note that '{}' is not allowed in globs by this script,
|
|
# so only '*' and '?' and '[]' are available.
|
|
if (/^[ \t]*([^ \t;{}#]+);?[ \t]*$/) {
|
|
my $ptn = $1;
|
|
# Turn the glob into a regex by replacing '*' with '.*'.
|
|
$ptn =~ s/\*/.*/g;
|
|
# And replacing '?' with '.'.
|
|
$ptn =~ s/\?/./g;
|
|
push @$glob,$ptn;
|
|
next;
|
|
}
|
|
# Important sanity check. This script can't handle lots of formats
|
|
# that GNU ld can, so be sure to error out if one is seen!
|
|
die "strange line `$_'";
|
|
}
|
|
close F;
|
|
|
|
# Make 'if (1)' for debugging.
|
|
if (0) {
|
|
print "cxx:\n";
|
|
(printf "%s\n",$_) foreach (@cxx_globs);
|
|
print "globs:\n";
|
|
(printf "%s\n", $_) foreach (@globs);
|
|
print "ignored:\n";
|
|
(printf "%s\n", $_) foreach (@ignored);
|
|
}
|
|
|
|
##########
|
|
# Combine the arrays into single regular expressions
|
|
# This cuts the time required from about 30 seconds to about 0.5 seconds.
|
|
|
|
my $glob_regex = '^_(' . (join '|',@globs) . ')$';
|
|
my $cxx_regex = (join '|',@cxx_globs);
|
|
|
|
##########
|
|
# Get all the symbols from the library, match them, and add them to a hash.
|
|
|
|
my %export_hash = ();
|
|
my $nm = $ENV{'NM_FOR_TARGET'} || "nm";
|
|
# Process each symbol.
|
|
print STDERR $nm.' -P '.(join ' ',@ARGV).'|';
|
|
open NM,$nm.' -P '.(join ' ',@ARGV).'|' or die $!;
|
|
# Talk to c++filt through a pair of file descriptors.
|
|
open2(*FILTIN, *FILTOUT, "c++filt -_") or die $!;
|
|
NAME: while (<NM>) {
|
|
my $i;
|
|
chomp;
|
|
|
|
# nm prints out stuff at the start, ignore it.
|
|
next if (/^$/);
|
|
next if (/:$/);
|
|
# Ignore undefined and local symbols.
|
|
next if (/^([^ ]+) [Ua-z] /);
|
|
|
|
# GCC does not export construction vtables from shared libraries.
|
|
# However the symbols are marked hidden, for Darwin that makes them
|
|
# also external "private_extern", which means that they show up in
|
|
# this list. When ld64 encounters them it generates a warning that
|
|
# they cannot be exported, so trim them from the set now.
|
|
next if (/^construction vtable.*$/);
|
|
next if (/^__ZTC.*$/);
|
|
|
|
# $sym is the name of the symbol, $noeh_sym is the same thing with
|
|
# any '.eh' suffix removed.
|
|
die "unknown nm output $_" if (! /^([^ ]+) [A-Z] /);
|
|
my $sym = $1;
|
|
my $noeh_sym = $sym;
|
|
$noeh_sym =~ s/\.eh$//;
|
|
|
|
# Maybe it matches one of the patterns based on the symbol in the .o file.
|
|
if ($noeh_sym =~ /$glob_regex/) {
|
|
$export_hash{$sym} = 1;
|
|
next NAME;
|
|
}
|
|
|
|
# No? Well, maybe its demangled form matches one of those patterns.
|
|
printf FILTOUT "%s\n",$noeh_sym;
|
|
my $dem = <FILTIN>;
|
|
chomp $dem;
|
|
if ($dem =~ /$cxx_regex/) {
|
|
$export_hash{$sym} = 2;
|
|
next NAME;
|
|
}
|
|
|
|
# No? Well, then ignore it.
|
|
}
|
|
close NM or die "nm error";
|
|
close FILTOUT or die "c++filt error";
|
|
close FILTIN or die "c++filt error";
|
|
|
|
##########
|
|
# Print out the export file
|
|
|
|
# Print information about generating this file
|
|
print "# This is a generated file.\n";
|
|
print "# It was generated by:\n";
|
|
printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV);
|
|
|
|
foreach my $i (keys %export_hash) {
|
|
printf "%s\n",$i or die;
|
|
}
|