334 lines
8.8 KiB
Perl
334 lines
8.8 KiB
Perl
#!/usr/bin/perl -w
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# make_sunver.pl
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#
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# This script takes at least two arguments, a GNU style version script and
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# a list of object and archive files, and generates a corresponding Sun
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# style version script as follows:
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#
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# Each glob pattern, C++ mangled pattern or literal in the input script is
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# matched against all global symbols in the input objects, emitting those
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# that matched (or nothing if no match was found).
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# A comment with the original pattern and its type is left in the output
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# file to make it easy to understand the matches.
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#
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# It uses elfdump when present (native), GNU readelf otherwise.
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# It depends on the GNU version of c++filt, since it must understand the
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# GNU mangling style.
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use FileHandle;
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use IPC::Open2;
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# Enforce C locale.
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$ENV{'LC_ALL'} = "C";
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$ENV{'LANG'} = "C";
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# Input version script, GNU style.
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my $symvers = shift;
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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 %sym_hash = ();
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# List of objects and archives to process.
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my @OBJECTS = ();
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# List of shared objects to omit from processing.
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my @SHAREDOBJS = ();
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# Filter out those input archives that have corresponding shared objects to
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# avoid adding all symbols matched in the archive to the output map.
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foreach $file (@ARGV) {
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if (($so = $file) =~ s/\.a$/.so/ && -e $so) {
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printf STDERR "omitted $file -> $so\n";
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push (@SHAREDOBJS, $so);
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} else {
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push (@OBJECTS, $file);
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}
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}
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# We need to detect and ignore hidden symbols. Solaris nm can only detect
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# this in the harder to parse default output format, and GNU nm not at all,
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# so use elfdump -s in the native case and GNU readelf -s otherwise.
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# GNU objdump -t cannot be used since it produces a variable number of
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# columns.
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# The path to elfdump.
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my $elfdump = "/usr/ccs/bin/elfdump";
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if (-f $elfdump) {
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open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!;
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my $skip_arsym = 0;
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while (<ELFDUMP>) {
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chomp;
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# Ignore empty lines.
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if (/^$/) {
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# End of archive symbol table, stop skipping.
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$skip_arsym = 0 if $skip_arsym;
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next;
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}
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# Keep skipping until end of archive symbol table.
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next if ($skip_arsym);
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# Ignore object name header for individual objects and archives.
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next if (/:$/);
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# Ignore table header lines.
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next if (/^Symbol Table Section:/);
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next if (/index.*value.*size/);
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# Start of archive symbol table: start skipping.
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if (/^Symbol Table: \(archive/) {
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$skip_arsym = 1;
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next;
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}
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# Split table.
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(undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split;
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# Error out for unknown input.
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die "unknown input line:\n$_" unless defined($bind);
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# Ignore local symbols.
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next if ($bind eq "LOCL");
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# Ignore hidden symbols.
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next if ($oth eq "H");
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# Ignore undefined symbols.
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next if ($shndx eq "UNDEF");
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# Error out for unhandled cases.
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if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") {
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die "unhandled symbol:\n$_";
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}
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# Remember symbol.
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$sym_hash{$name}++;
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}
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close ELFDUMP or die "$elfdump error";
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} else {
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open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!;
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# Process each symbol.
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while (<READELF>) {
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chomp;
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# Ignore empty lines.
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next if (/^$/);
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# Ignore object name header.
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next if (/^File: .*$/);
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# Ignore table header lines.
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next if (/^Symbol table.*contains.*:/);
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next if (/Num:.*Value.*Size/);
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# Split table.
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(undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split;
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# Error out for unknown input.
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die "unknown input line:\n$_" unless defined($bind);
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# Ignore local symbols.
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next if ($bind eq "LOCAL");
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# Ignore hidden symbols.
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next if ($vis eq "HIDDEN");
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# Ignore undefined symbols.
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next if ($ndx eq "UND");
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# Error out for unhandled cases.
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if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") {
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die "unhandled symbol:\n$_";
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}
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# Remember symbol.
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$sym_hash{$name}++;
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}
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close READELF or die "readelf error";
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}
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##########
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# The various types of glob patterns.
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#
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# A glob pattern that is to be applied to the demangled name: 'cxx'.
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# A glob patterns that applies directly to the name in the .o files: 'glob'.
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# This pattern is ignored; used for local variables (usually just '*'): 'ign'.
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# The type of the current pattern.
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my $glob = 'glob';
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# We're currently inside `extern "C++"', which Sun ld doesn't understand.
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my $in_extern = 0;
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# The c++filt command to use. This *must* be GNU c++filt; the Sun Studio
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# c++filt doesn't handle the GNU mangling style.
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my $cxxfilt = $ENV{'CXXFILT'} || "c++filt";
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# The current version name.
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my $current_version = "";
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# Was there any attempt to match a symbol to this version?
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my $matches_attempted;
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# The number of versions which matched this symbol.
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my $matched_symbols;
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open F,$symvers or die $!;
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# Print information about generating this file
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print "# This file was generated by make_sunver.pl. DO NOT EDIT!\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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printf "# Omitted archives with corresponding shared libraries: %s\n",
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(join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0;
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print "#\n\n";
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while (<F>) {
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# Lines of the form '};'
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if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) {
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$glob = 'glob';
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if ($in_extern) {
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$in_extern--;
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print "$1##$2\n";
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} else {
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print;
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}
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next;
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}
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# Lines of the form '} SOME_VERSION_NAME_1.0;'
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if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) {
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$glob = 'glob';
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# We tried to match symbols agains this version, but none matched.
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# Emit dummy hidden symbol to avoid marking this version WEAK.
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if ($matches_attempted && $matched_symbols == 0) {
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print " hidden:\n";
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print " .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n";
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}
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print; next;
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}
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# Comment and blank lines
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if (/^[ \t]*\#/) { print; next; }
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if (/^[ \t]*$/) { print; next; }
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# Lines of the form '{'
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if (/^([ \t]*){$/) {
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if ($in_extern) {
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print "$1##{\n";
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} else {
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print;
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}
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next;
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}
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# Lines of the form 'SOME_VERSION_NAME_1.1 {'
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if (/^([A-Z0-9_.]+)[ \t]+{$/) {
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# Record version name.
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$current_version = $1;
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# Reset match attempts, #matched symbols for this version.
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$matches_attempted = 0;
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$matched_symbols = 0;
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print;
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next;
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}
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# Ignore 'global:'
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if (/^[ \t]*global:$/) { print; next; }
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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 = 'ign';
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print;
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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]*)$/) {
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$in_extern++;
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$glob = 'cxx';
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# Need to comment, Sun ld cannot handle this.
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print "$1##$2\n"; next;
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}
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# Chomp newline now we're done with passing through the input file.
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chomp;
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# Catch globs. Note that '{}' is not allowed in globs by this script,
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# so only '*' and '[]' are available.
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if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) {
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my $ws = $1;
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my $ptn = $2;
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# Turn the glob into a regex by replacing '*' with '.*', '?' with '.'.
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# Keep $ptn so we can still print the original form.
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($pattern = $ptn) =~ s/\*/\.\*/g;
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$pattern =~ s/\?/\./g;
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if ($glob eq 'ign') {
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# We're in a local: * section; just continue.
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print "$_\n";
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next;
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}
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# Print the glob commented for human readers.
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print "$ws##$ptn ($glob)\n";
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# We tried to match a symbol to this version.
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$matches_attempted++;
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if ($glob eq 'glob') {
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my %ptn_syms = ();
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# Match ptn against symbols in %sym_hash.
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foreach my $sym (keys %sym_hash) {
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# Maybe it matches one of the patterns based on the symbol in
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# the .o file.
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$ptn_syms{$sym}++ if ($sym =~ /^$pattern$/);
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}
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foreach my $sym (sort keys(%ptn_syms)) {
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$matched_symbols++;
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print "$ws$sym;\n";
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}
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} elsif ($glob eq 'cxx') {
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my %dem_syms = ();
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# Verify that we're actually using GNU c++filt. Other versions
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# most likely cannot handle GNU style symbol mangling.
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my $cxxout = `$cxxfilt --version 2>&1`;
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$cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function";
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# Talk to c++filt through a pair of file descriptors.
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# Need to start a fresh instance per pattern, otherwise the
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# process grows to 500+ MB.
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my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!;
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# Match ptn against symbols in %sym_hash.
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foreach my $sym (keys %sym_hash) {
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# No? Well, maybe its demangled form matches one of those
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# patterns.
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printf FILTOUT "%s\n",$sym;
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my $dem = <FILTIN>;
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chomp $dem;
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$dem_syms{$sym}++ if ($dem =~ /^$pattern$/);
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}
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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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# Need to wait for the c++filt process to avoid lots of zombies.
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waitpid $pid, 0;
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foreach my $sym (sort keys(%dem_syms)) {
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$matched_symbols++;
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print "$ws$sym;\n";
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}
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} else {
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# No? Well, then ignore it.
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}
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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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