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