| #!/usr/bin/env perl |
| |
| # make_sunver.pl |
| # |
| # Copyright (C) 2010, 2011, 2012, 2013 |
| # Free Software Foundation, Inc. |
| # |
| # This file is free software; you can redistribute it and/or modify it |
| # under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 3 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, but |
| # WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| # General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; see the file COPYING.GPLv3. If not see |
| # <http://www.gnu.org/licenses/>. |
| |
| # This script takes at least two arguments, a GNU style version script and |
| # a list of object and archive files, and generates a corresponding Sun |
| # style version script as follows: |
| # |
| # Each glob pattern, C++ mangled pattern or literal in the input script is |
| # matched against all global symbols in the input objects, emitting those |
| # that matched (or nothing if no match was found). |
| # A comment with the original pattern and its type is left in the output |
| # file to make it easy to understand the matches. |
| # |
| # It uses elfdump when present (native), GNU readelf otherwise. |
| # It depends on the GNU version of c++filt, since it must understand the |
| # GNU mangling style. |
| |
| use FileHandle; |
| use IPC::Open2; |
| |
| # Enforce C locale. |
| $ENV{'LC_ALL'} = "C"; |
| $ENV{'LANG'} = "C"; |
| |
| # Input version script, GNU style. |
| my $symvers = shift; |
| |
| ########## |
| # Get all the symbols from the library, match them, and add them to a hash. |
| |
| my %sym_hash = (); |
| |
| # List of objects and archives to process. |
| my @OBJECTS = (); |
| |
| # List of shared objects to omit from processing. |
| my @SHAREDOBJS = (); |
| |
| # Filter out those input archives that have corresponding shared objects to |
| # avoid adding all symbols matched in the archive to the output map. |
| foreach $file (@ARGV) { |
| if (($so = $file) =~ s/\.a$/.so/ && -e $so) { |
| printf STDERR "omitted $file -> $so\n"; |
| push (@SHAREDOBJS, $so); |
| } else { |
| push (@OBJECTS, $file); |
| } |
| } |
| |
| # We need to detect and ignore hidden symbols. Solaris nm can only detect |
| # this in the harder to parse default output format, and GNU nm not at all, |
| # so use elfdump -s in the native case and GNU readelf -s otherwise. |
| # GNU objdump -t cannot be used since it produces a variable number of |
| # columns. |
| |
| # The path to elfdump. |
| my $elfdump = "/usr/ccs/bin/elfdump"; |
| |
| if (-f $elfdump) { |
| open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!; |
| my $skip_arsym = 0; |
| |
| while (<ELFDUMP>) { |
| chomp; |
| |
| # Ignore empty lines. |
| if (/^$/) { |
| # End of archive symbol table, stop skipping. |
| $skip_arsym = 0 if $skip_arsym; |
| next; |
| } |
| |
| # Keep skipping until end of archive symbol table. |
| next if ($skip_arsym); |
| |
| # Ignore object name header for individual objects and archives. |
| next if (/:$/); |
| |
| # Ignore table header lines. |
| next if (/^Symbol Table Section:/); |
| next if (/index.*value.*size/); |
| |
| # Start of archive symbol table: start skipping. |
| if (/^Symbol Table: \(archive/) { |
| $skip_arsym = 1; |
| next; |
| } |
| |
| # Split table. |
| (undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split; |
| |
| # Error out for unknown input. |
| die "unknown input line:\n$_" unless defined($bind); |
| |
| # Ignore local symbols. |
| next if ($bind eq "LOCL"); |
| # Ignore hidden symbols. |
| next if ($oth eq "H"); |
| # Ignore undefined symbols. |
| next if ($shndx eq "UNDEF"); |
| # Error out for unhandled cases. |
| if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") { |
| die "unhandled symbol:\n$_"; |
| } |
| |
| # Remember symbol. |
| $sym_hash{$name}++; |
| } |
| close ELFDUMP or die "$elfdump error"; |
| } else { |
| open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!; |
| # Process each symbol. |
| while (<READELF>) { |
| chomp; |
| |
| # Ignore empty lines. |
| next if (/^$/); |
| |
| # Ignore object name header. |
| next if (/^File: .*$/); |
| |
| # Ignore table header lines. |
| next if (/^Symbol table.*contains.*:/); |
| next if (/Num:.*Value.*Size/); |
| |
| # Split table. |
| (undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split; |
| |
| # Error out for unknown input. |
| die "unknown input line:\n$_" unless defined($bind); |
| |
| # Ignore local symbols. |
| next if ($bind eq "LOCAL"); |
| # Ignore hidden symbols. |
| next if ($vis eq "HIDDEN"); |
| # Ignore undefined symbols. |
| next if ($ndx eq "UND"); |
| # Error out for unhandled cases. |
| if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") { |
| die "unhandled symbol:\n$_"; |
| } |
| |
| # Remember symbol. |
| $sym_hash{$name}++; |
| } |
| close READELF or die "readelf error"; |
| } |
| |
| ########## |
| # The various types of glob patterns. |
| # |
| # A glob pattern that is to be applied to the demangled name: 'cxx'. |
| # A glob patterns that applies directly to the name in the .o files: 'glob'. |
| # This pattern is ignored; used for local variables (usually just '*'): 'ign'. |
| |
| # The type of the current pattern. |
| my $glob = 'glob'; |
| |
| # We're currently inside `extern "C++"', which Sun ld doesn't understand. |
| my $in_extern = 0; |
| |
| # The c++filt command to use. This *must* be GNU c++filt; the Sun Studio |
| # c++filt doesn't handle the GNU mangling style. |
| my $cxxfilt = $ENV{'CXXFILT'} || "c++filt"; |
| |
| # The current version name. |
| my $current_version = ""; |
| |
| # Was there any attempt to match a symbol to this version? |
| my $matches_attempted; |
| |
| # The number of versions which matched this symbol. |
| my $matched_symbols; |
| |
| open F,$symvers or die $!; |
| |
| # Print information about generating this file |
| print "# This file was generated by make_sunver.pl. DO NOT EDIT!\n"; |
| print "# It was generated by:\n"; |
| printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV); |
| printf "# Omitted archives with corresponding shared libraries: %s\n", |
| (join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0; |
| print "#\n\n"; |
| |
| print "\$mapfile_version 2\n"; |
| |
| while (<F>) { |
| # Lines of the form '};' |
| if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) { |
| $glob = 'glob'; |
| if ($in_extern) { |
| $in_extern--; |
| print "$1##$2\n"; |
| } else { |
| print; |
| } |
| next; |
| } |
| |
| # Lines of the form '} SOME_VERSION_NAME_1.0;' |
| if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) { |
| $glob = 'glob'; |
| # We tried to match symbols agains this version, but none matched. |
| # Emit dummy hidden symbol to avoid marking this version WEAK. |
| if ($matches_attempted && $matched_symbols == 0) { |
| print " hidden:\n"; |
| print " .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n"; |
| } |
| print; next; |
| } |
| |
| # Comment and blank lines |
| if (/^[ \t]*\#/) { print; next; } |
| if (/^[ \t]*$/) { print; next; } |
| |
| # Lines of the form '{' |
| if (/^([ \t]*){$/) { |
| if ($in_extern) { |
| print "$1##{\n"; |
| } else { |
| print; |
| } |
| next; |
| } |
| |
| # Lines of the form 'SOME_VERSION_NAME_1.1 {' |
| if (/^([A-Z0-9_.]+)[ \t]+{$/) { |
| # Record version name. |
| $current_version = $1; |
| # Reset match attempts, #matched symbols for this version. |
| $matches_attempted = 0; |
| $matched_symbols = 0; |
| print "SYMBOL_VERSION $1 {\n"; |
| next; |
| } |
| |
| # Ignore 'global:' |
| if (/^[ \t]*global:$/) { print; next; } |
| |
| # After 'local:', globs should be ignored, they won't be exported. |
| if (/^[ \t]*local:$/) { |
| $glob = 'ign'; |
| print; |
| next; |
| } |
| |
| # After 'extern "C++"', globs are C++ patterns |
| if (/^([ \t]*)(extern \"C\+\+\"[ \t]*)$/) { |
| $in_extern++; |
| $glob = 'cxx'; |
| # Need to comment, Sun ld cannot handle this. |
| print "$1##$2\n"; next; |
| } |
| |
| # Chomp newline now we're done with passing through the input file. |
| chomp; |
| |
| # Catch globs. Note that '{}' is not allowed in globs by this script, |
| # so only '*' and '[]' are available. |
| if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) { |
| my $ws = $1; |
| my $ptn = $2; |
| # Turn the glob into a regex by replacing '*' with '.*', '?' with '.'. |
| # Keep $ptn so we can still print the original form. |
| ($pattern = $ptn) =~ s/\*/\.\*/g; |
| $pattern =~ s/\?/\./g; |
| |
| if ($glob eq 'ign') { |
| # We're in a local: * section; just continue. |
| print "$_\n"; |
| next; |
| } |
| |
| # Print the glob commented for human readers. |
| print "$ws##$ptn ($glob)\n"; |
| # We tried to match a symbol to this version. |
| $matches_attempted++; |
| |
| if ($glob eq 'glob') { |
| my %ptn_syms = (); |
| |
| # Match ptn against symbols in %sym_hash. |
| foreach my $sym (keys %sym_hash) { |
| # Maybe it matches one of the patterns based on the symbol in |
| # the .o file. |
| $ptn_syms{$sym}++ if ($sym =~ /^$pattern$/); |
| } |
| |
| foreach my $sym (sort keys(%ptn_syms)) { |
| $matched_symbols++; |
| print "$ws$sym;\n"; |
| } |
| } elsif ($glob eq 'cxx') { |
| my %dem_syms = (); |
| |
| # Verify that we're actually using GNU c++filt. Other versions |
| # most likely cannot handle GNU style symbol mangling. |
| my $cxxout = `$cxxfilt --version 2>&1`; |
| $cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function"; |
| |
| # Talk to c++filt through a pair of file descriptors. |
| # Need to start a fresh instance per pattern, otherwise the |
| # process grows to 500+ MB. |
| my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!; |
| |
| # Match ptn against symbols in %sym_hash. |
| foreach my $sym (keys %sym_hash) { |
| # No? Well, maybe its demangled form matches one of those |
| # patterns. |
| printf FILTOUT "%s\n",$sym; |
| my $dem = <FILTIN>; |
| chomp $dem; |
| $dem_syms{$sym}++ if ($dem =~ /^$pattern$/); |
| } |
| |
| close FILTOUT or die "c++filt error"; |
| close FILTIN or die "c++filt error"; |
| # Need to wait for the c++filt process to avoid lots of zombies. |
| waitpid $pid, 0; |
| |
| foreach my $sym (sort keys(%dem_syms)) { |
| $matched_symbols++; |
| print "$ws$sym;\n"; |
| } |
| } else { |
| # No? Well, then ignore it. |
| } |
| next; |
| } |
| # Important sanity check. This script can't handle lots of formats |
| # that GNU ld can, so be sure to error out if one is seen! |
| die "strange line `$_'"; |
| } |
| close F; |
