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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:45:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:45:20 +0000 |
commit | 9a08cbfcc1ef900a04580f35afe2a4592d7d6030 (patch) | |
tree | 004cc7027bca2f2c0bcb5806527c8e0c48df2d6e /scripts/Dpkg/Shlibs/Cppfilt.pm | |
parent | Initial commit. (diff) | |
download | dpkg-upstream.tar.xz dpkg-upstream.zip |
Adding upstream version 1.19.8.upstream/1.19.8upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'scripts/Dpkg/Shlibs/Cppfilt.pm')
-rw-r--r-- | scripts/Dpkg/Shlibs/Cppfilt.pm | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/scripts/Dpkg/Shlibs/Cppfilt.pm b/scripts/Dpkg/Shlibs/Cppfilt.pm new file mode 100644 index 0000000..d5a8bb2 --- /dev/null +++ b/scripts/Dpkg/Shlibs/Cppfilt.pm @@ -0,0 +1,116 @@ +# Copyright © 2009-2010 Modestas Vainius <modax@debian.org> +# Copyright © 2010, 2012-2015 Guillem Jover <guillem@debian.org> +# +# This program 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 2 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. If not, see <https://www.gnu.org/licenses/>. + +package Dpkg::Shlibs::Cppfilt; + +use strict; +use warnings; + +our $VERSION = '0.01'; +our @EXPORT = qw( + cppfilt_demangle_cpp +); +our @EXPORT_OK = qw( + cppfilt_demangle +); + +use Exporter qw(import); + +use Dpkg::ErrorHandling; +use Dpkg::IPC; + +# A hash of 'objects' referring to preforked c++filt processes for the distinct +# demangling types. +my %cppfilts; + +sub get_cppfilt { + my $type = shift || 'auto'; + + # Fork c++filt process for demangling $type unless it is forked already. + # Keeping c++filt running improves performance a lot. + my $filt; + if (exists $cppfilts{$type}) { + $filt = $cppfilts{$type}; + } else { + $filt = { from => undef, to => undef, + last_symbol => '', last_result => '' }; + $filt->{pid} = spawn(exec => [ 'c++filt', "--format=$type" ], + from_pipe => \$filt->{from}, + to_pipe => \$filt->{to}); + syserr(g_('unable to execute %s'), 'c++filt') + unless defined $filt->{from}; + $filt->{from}->autoflush(1); + + $cppfilts{$type} = $filt; + } + return $filt; +} + +# Demangle the given $symbol using demangler for the specified $type (defaults +# to 'auto') . Extraneous characters trailing after a mangled name are kept +# intact. If neither whole $symbol nor portion of it could be demangled, undef +# is returned. +sub cppfilt_demangle { + my ($symbol, $type) = @_; + + # Start or get c++filt 'object' for the requested type. + my $filt = get_cppfilt($type); + + # Remember the last result. Such a local optimization is cheap and useful + # when sequential pattern matching is performed. + if ($filt->{last_symbol} ne $symbol) { + # This write/read operation should not deadlock because c++filt flushes + # output buffer on LF or each invalid character. + print { $filt->{from} } $symbol, "\n"; + my $demangled = readline($filt->{to}); + chop $demangled; + + # If the symbol was not demangled, return undef + $demangled = undef if $symbol eq $demangled; + + # Remember the last result + $filt->{last_symbol} = $symbol; + $filt->{last_result} = $demangled; + } + return $filt->{last_result}; +} + +sub cppfilt_demangle_cpp { + my $symbol = shift; + return cppfilt_demangle($symbol, 'auto'); +} + +sub terminate_cppfilts { + foreach my $type (keys %cppfilts) { + next if not defined $cppfilts{$type}{pid}; + close $cppfilts{$type}{from}; + close $cppfilts{$type}{to}; + wait_child($cppfilts{$type}{pid}, cmdline => 'c++filt', + nocheck => 1, + timeout => 5); + delete $cppfilts{$type}; + } +} + +# Close/terminate running c++filt process(es) +END { + # Make sure exitcode is not changed (by wait_child) + my $exitcode = $?; + terminate_cppfilts(); + $? = $exitcode; +} + +1; |