mirror of https://github.com/FFmpeg/FFmpeg.git
The versioning facility in the Solaris linker differs from Linux in 3 ways: 1. It does not support globs in linker scripts for symbol versioning -- this is a GNU extension. 2. The linker argument is '-M', instead of '--version-script'. 3. It is picky about line endings. Each symbol or directive must be on a line of it's own. Let's use make_sunver.pl from GCC to generate a version script that works correctly with the Solaris linker. It's function is to correctly expand the globs in the original generated version script. Signed-off-by: Luca Barbato <lu_zero@gentoo.org>pull/264/head
Sean McGovern
9 years ago
committed by
Luca Barbato
parent
b9ece15a01
commit
c1aac39eac
4 changed files with 363 additions and 5 deletions
@ -0,0 +1,352 @@ |
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#!/usr/bin/perl -w |
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|
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# make_sunver.pl |
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# |
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# Copyright (C) 2010, 2011, 2012, 2013 |
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# Free Software Foundation, Inc. |
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# |
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# This file is free software; you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; see the file COPYING.GPLv3. If not see |
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# <http://www.gnu.org/licenses/>. |
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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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|
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use FileHandle; |
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use IPC::Open2; |
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|
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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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|
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# Input version script, GNU style. |
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my $symvers = shift; |
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|
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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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|
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my %sym_hash = (); |
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|
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# List of objects and archives to process. |
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my @OBJECTS = (); |
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|
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# List of shared objects to omit from processing. |
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my @SHAREDOBJS = (); |
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|
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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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|
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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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|
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# The path to elfdump. |
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my $elfdump = "/usr/ccs/bin/elfdump"; |
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|
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if (-f $elfdump) { |
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open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!; |
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my $skip_arsym = 0; |
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|
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while (<ELFDUMP>) { |
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chomp; |
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|
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# Ignore empty lines. |
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if (/^$/) { |
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# End of archive symbol table, stop skipping. |
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$skip_arsym = 0 if $skip_arsym; |
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next; |
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} |
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|
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# Keep skipping until end of archive symbol table. |
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next if ($skip_arsym); |
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|
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# Ignore object name header for individual objects and archives. |
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next if (/:$/); |
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|
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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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|
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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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|
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# Split table. |
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(undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split; |
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|
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# Error out for unknown input. |
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die "unknown input line:\n$_" unless defined($bind); |
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|
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# Ignore local symbols. |
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next if ($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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|
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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 $!; |
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# Process each symbol. |
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while (<READELF>) { |
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chomp; |
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|
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# Ignore empty lines. |
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next if (/^$/); |
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|
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# Ignore object name header. |
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next if (/^File: .*$/); |
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|
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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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|
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# Split table. |
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(undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split; |
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|
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# Error out for unknown input. |
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die "unknown input line:\n$_" unless defined($bind); |
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|
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# Ignore local symbols. |
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next if ($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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|
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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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|
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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 $#SHAREDOBJS >= 0; |
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print "#\n\n"; |
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print "\$mapfile_version 2\n"; |
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while (<F>) { |
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# Lines of the form '};' |
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if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) { |
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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##$2\n"; |
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} else { |
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print; |
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} |
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next; |
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} |
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|
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# Lines of the form '} SOME_VERSION_NAME_1.0;' |
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if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) { |
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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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|
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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 "$1##{\n"; |
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} else { |
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print; |
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} |
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next; |
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} |
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|
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# Lines of the form 'SOME_VERSION_NAME_1.1 {' |
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if (/^([A-Z0-9_.]+)[ \t]+{$/) { |
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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 "SYMBOL_VERSION $1 {\n"; |
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next; |
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} |
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|
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# Ignore 'global:' |
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if (/^[ \t]*global:$/) { 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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|
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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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|
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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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|
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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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