Adding upstream version 1.21.22.upstream/1.21.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 697 insertions, 0 deletions

diff --git a/scripts/Dpkg/Shlibs/SymbolFile.pm b/scripts/Dpkg/Shlibs/SymbolFile.pm
new file mode 100644
index 0000000..d492055
--- /dev/null
+++ b/scripts/Dpkg/Shlibs/SymbolFile.pm
@@ -0,0 +1,697 @@
+# Copyright © 2007 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2009-2010 Modestas Vainius <modax@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::SymbolFile;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use Dpkg::Gettext;
+use Dpkg::ErrorHandling;
+use Dpkg::Version;
+use Dpkg::Control::Fields;
+use Dpkg::Shlibs::Symbol;
+use Dpkg::Arch qw(get_host_arch);
+
+use parent qw(Dpkg::Interface::Storable);
+
+# Needed by the deprecated key, which is a correct use.
+no if $Dpkg::Version::VERSION ge '1.02',
+    warnings => qw(Dpkg::Version::semantic_change::overload::bool);
+
+my %internal_symbol = (
+    __bss_end__ => 1,                   # arm
+    __bss_end => 1,                     # arm
+    _bss_end__ => 1,                    # arm
+    __bss_start => 1,                   # ALL
+    __bss_start__ => 1,                 # arm
+    __data_start => 1,                  # arm
+    __do_global_ctors_aux => 1,         # ia64
+    __do_global_dtors_aux => 1,         # ia64
+    __do_jv_register_classes => 1,      # ia64
+    _DYNAMIC => 1,                      # ALL
+    _edata => 1,                        # ALL
+    _end => 1,                          # ALL
+    __end__ => 1,                       # arm
+    __exidx_end => 1,                   # armel
+    __exidx_start => 1,                 # armel
+    _fbss => 1,                         # mips, mipsel
+    _fdata => 1,                        # mips, mipsel
+    _fini => 1,                         # ALL
+    _ftext => 1,                        # mips, mipsel
+    _GLOBAL_OFFSET_TABLE_ => 1,         # hppa, mips, mipsel
+    __gmon_start__ => 1,                # hppa
+    __gnu_local_gp => 1,                # mips, mipsel
+    _gp => 1,                           # mips, mipsel
+    _init => 1,                         # ALL
+    _PROCEDURE_LINKAGE_TABLE_ => 1,     # sparc, alpha
+    _SDA2_BASE_ => 1,                   # powerpc
+    _SDA_BASE_ => 1,                    # powerpc
+);
+
+for my $i (14 .. 31) {
+    # Many powerpc specific symbols
+    $internal_symbol{"_restfpr_$i"} = 1;
+    $internal_symbol{"_restfpr_$i\_x"} = 1;
+    $internal_symbol{"_restgpr_$i"} = 1;
+    $internal_symbol{"_restgpr_$i\_x"} = 1;
+    $internal_symbol{"_savefpr_$i"} = 1;
+    $internal_symbol{"_savegpr_$i"} = 1;
+}
+
+sub symbol_is_internal {
+    my ($symbol, $include_groups) = @_;
+
+    return 1 if exists $internal_symbol{$symbol};
+
+    # The ARM Embedded ABI spec states symbols under this namespace as
+    # possibly appearing in output objects.
+    return 1 if not ${$include_groups}{aeabi} and $symbol =~ /^__aeabi_/;
+
+    # The GNU implementation of the OpenMP spec, specifies symbols under
+    # this namespace as possibly appearing in output objects.
+    return 1 if not ${$include_groups}{gomp}
+                and $symbol =~ /^\.gomp_critical_user_/;
+
+    return 0;
+}
+
+sub new {
+    my ($this, %opts) = @_;
+    my $class = ref($this) || $this;
+    my $self = \%opts;
+    bless $self, $class;
+    $self->{arch} //= get_host_arch();
+    $self->clear();
+    if (exists $self->{file}) {
+	$self->load($self->{file}) if -e $self->{file};
+    }
+    return $self;
+}
+
+sub get_arch {
+    my $self = shift;
+    return $self->{arch};
+}
+
+sub clear {
+    my $self = shift;
+    $self->{objects} = {};
+}
+
+sub clear_except {
+    my ($self, @ids) = @_;
+
+    my %has = map { $_ => 1 } @ids;
+    foreach my $objid (keys %{$self->{objects}}) {
+	delete $self->{objects}{$objid} unless exists $has{$objid};
+    }
+}
+
+sub get_sonames {
+    my $self = shift;
+    return keys %{$self->{objects}};
+}
+
+sub get_symbols {
+    my ($self, $soname) = @_;
+    if (defined $soname) {
+	my $obj = $self->get_object($soname);
+	return (defined $obj) ? values %{$obj->{syms}} : ();
+    } else {
+	my @syms;
+	foreach my $soname ($self->get_sonames()) {
+	    push @syms, $self->get_symbols($soname);
+	}
+	return @syms;
+    }
+}
+
+sub get_patterns {
+    my ($self, $soname) = @_;
+    my @patterns;
+    if (defined $soname) {
+	my $obj = $self->get_object($soname);
+	foreach my $alias (values %{$obj->{patterns}{aliases}}) {
+	    push @patterns, values %$alias;
+	}
+	return (@patterns, @{$obj->{patterns}{generic}});
+    } else {
+	foreach my $soname ($self->get_sonames()) {
+	    push @patterns, $self->get_patterns($soname);
+	}
+	return @patterns;
+    }
+}
+
+# Create a symbol from the supplied string specification.
+sub create_symbol {
+    my ($self, $spec, %opts) = @_;
+    my $symbol = (exists $opts{base}) ? $opts{base} :
+	Dpkg::Shlibs::Symbol->new();
+
+    my $ret = $opts{dummy} ? $symbol->parse_symbolspec($spec, default_minver => 0) :
+	$symbol->parse_symbolspec($spec);
+    if ($ret) {
+	$symbol->initialize(arch => $self->get_arch());
+	return $symbol;
+    }
+    return;
+}
+
+sub add_symbol {
+    my ($self, $symbol, $soname) = @_;
+    my $object = $self->get_object($soname);
+
+    if ($symbol->is_pattern()) {
+	if (my $alias_type = $symbol->get_alias_type()) {
+	    $object->{patterns}{aliases}{$alias_type} //= {};
+	    # Alias hash for matching.
+	    my $aliases = $object->{patterns}{aliases}{$alias_type};
+	    $aliases->{$symbol->get_symbolname()} = $symbol;
+	} else {
+	    # Otherwise assume this is a generic sequential pattern. This
+	    # should be always safe.
+	    push @{$object->{patterns}{generic}}, $symbol;
+	}
+	return 'pattern';
+    } else {
+	# invalidate the minimum version cache
+        $object->{minver_cache} = [];
+	$object->{syms}{$symbol->get_symbolname()} = $symbol;
+	return 'sym';
+    }
+}
+
+sub _new_symbol {
+    my $base = shift || 'Dpkg::Shlibs::Symbol';
+    return (ref $base) ? $base->clone(@_) : $base->new(@_);
+}
+
+# Option state is only used for recursive calls.
+sub parse {
+    my ($self, $fh, $file, %opts) = @_;
+    my $state = $opts{state} //= {};
+
+    if (exists $state->{seen}) {
+	return if exists $state->{seen}{$file}; # Avoid include loops
+    } else {
+	$self->{file} = $file;
+        $state->{seen} = {};
+    }
+    $state->{seen}{$file} = 1;
+
+    if (not ref $state->{obj_ref}) { # Init ref to name of current object/lib
+        ${$state->{obj_ref}} = undef;
+    }
+
+    while (<$fh>) {
+	chomp;
+
+	if (/^(?:\s+|#(?:DEPRECATED|MISSING): ([^#]+)#\s*)(.*)/) {
+	    if (not defined ${$state->{obj_ref}}) {
+		error(g_('symbol information must be preceded by a header (file %s, line %s)'), $file, $.);
+	    }
+	    # Symbol specification
+	    my $deprecated = ($1) ? Dpkg::Version->new($1) : 0;
+	    my $sym = _new_symbol($state->{base_symbol}, deprecated => $deprecated);
+	    if ($self->create_symbol($2, base => $sym)) {
+		$self->add_symbol($sym, ${$state->{obj_ref}});
+	    } else {
+		warning(g_('failed to parse line in %s: %s'), $file, $_);
+	    }
+	} elsif (/^(\(.*\))?#include\s+"([^"]+)"/) {
+	    my $tagspec = $1;
+	    my $filename = $2;
+	    my $dir = $file;
+	    my $old_base_symbol = $state->{base_symbol};
+	    my $new_base_symbol;
+	    if (defined $tagspec) {
+		$new_base_symbol = _new_symbol($old_base_symbol);
+		$new_base_symbol->parse_tagspec($tagspec);
+	    }
+	    $state->{base_symbol} = $new_base_symbol;
+	    $dir =~ s{[^/]+$}{}; # Strip filename
+	    $self->load("$dir$filename", %opts);
+	    $state->{base_symbol} = $old_base_symbol;
+	} elsif (/^#|^$/) {
+	    # Skip possible comments and empty lines
+	} elsif (/^\|\s*(.*)$/) {
+	    # Alternative dependency template
+	    push @{$self->{objects}{${$state->{obj_ref}}}{deps}}, "$1";
+	} elsif (/^\*\s*([^:]+):\s*(.*\S)\s*$/) {
+	    # Add meta-fields
+	    $self->{objects}{${$state->{obj_ref}}}{fields}{field_capitalize($1)} = $2;
+	} elsif (/^(\S+)\s+(.*)$/) {
+	    # New object and dependency template
+	    ${$state->{obj_ref}} = $1;
+	    if (exists $self->{objects}{${$state->{obj_ref}}}) {
+		# Update/override infos only
+		$self->{objects}{${$state->{obj_ref}}}{deps} = [ "$2" ];
+	    } else {
+		# Create a new object
+		$self->create_object(${$state->{obj_ref}}, "$2");
+	    }
+	} else {
+	    warning(g_('failed to parse a line in %s: %s'), $file, $_);
+	}
+    }
+    delete $state->{seen}{$file};
+}
+
+# Beware: we reuse the data structure of the provided symfile so make
+# sure to not modify them after having called this function
+sub merge_object_from_symfile {
+    my ($self, $src, $objid) = @_;
+    if (not $self->has_object($objid)) {
+        $self->{objects}{$objid} = $src->get_object($objid);
+    } else {
+        warning(g_('tried to merge the same object (%s) twice in a symfile'), $objid);
+    }
+}
+
+sub output {
+    my ($self, $fh, %opts) = @_;
+    $opts{template_mode} //= 0;
+    $opts{with_deprecated} //= 1;
+    $opts{with_pattern_matches} //= 0;
+    my $res = '';
+    foreach my $soname (sort $self->get_sonames()) {
+	my @deps = $self->get_dependencies($soname);
+	my $dep_first = shift @deps;
+	if (exists $opts{package} and not $opts{template_mode}) {
+	    $dep_first =~ s/#PACKAGE#/$opts{package}/g;
+	}
+	print { $fh } "$soname $dep_first\n" if defined $fh;
+	$res .= "$soname $dep_first\n" if defined wantarray;
+
+	foreach my $dep_next (@deps) {
+	    if (exists $opts{package} and not $opts{template_mode}) {
+	        $dep_next =~ s/#PACKAGE#/$opts{package}/g;
+	    }
+	    print { $fh } "| $dep_next\n" if defined $fh;
+	    $res .= "| $dep_next\n" if defined wantarray;
+	}
+	my $f = $self->{objects}{$soname}{fields};
+	foreach my $field (sort keys %{$f}) {
+	    my $value = $f->{$field};
+	    if (exists $opts{package} and not $opts{template_mode}) {
+	        $value =~ s/#PACKAGE#/$opts{package}/g;
+	    }
+	    print { $fh } "* $field: $value\n" if defined $fh;
+	    $res .= "* $field: $value\n" if defined wantarray;
+	}
+
+	my @symbols;
+	if ($opts{template_mode}) {
+	    # Exclude symbols matching a pattern, but include patterns themselves
+	    @symbols = grep { not $_->get_pattern() } $self->get_symbols($soname);
+	    push @symbols, $self->get_patterns($soname);
+	} else {
+	    @symbols = $self->get_symbols($soname);
+	}
+	foreach my $sym (sort { $a->get_symboltempl() cmp
+	                        $b->get_symboltempl() } @symbols) {
+	    next if $sym->{deprecated} and not $opts{with_deprecated};
+	    # Do not dump symbols from foreign arch unless dumping a template.
+	    next if not $opts{template_mode} and
+	            not $sym->arch_is_concerned($self->get_arch());
+	    # Dump symbol specification. Dump symbol tags only in template mode.
+	    print { $fh } $sym->get_symbolspec($opts{template_mode}), "\n" if defined $fh;
+	    $res .= $sym->get_symbolspec($opts{template_mode}) . "\n" if defined wantarray;
+	    # Dump pattern matches as comments (if requested)
+	    if ($opts{with_pattern_matches} && $sym->is_pattern()) {
+		for my $match (sort { $a->get_symboltempl() cmp
+		                      $b->get_symboltempl() } $sym->get_pattern_matches())
+		{
+		    print { $fh } '#MATCH:', $match->get_symbolspec(0), "\n" if defined $fh;
+		    $res .= '#MATCH:' . $match->get_symbolspec(0) . "\n" if defined wantarray;
+		}
+	    }
+	}
+    }
+    return $res;
+}
+
+# Tries to match a symbol name and/or version against the patterns defined.
+# Returns a pattern which matches (if any).
+sub find_matching_pattern {
+    my ($self, $refsym, $sonames, $inc_deprecated) = @_;
+    $inc_deprecated //= 0;
+    my $name = (ref $refsym) ? $refsym->get_symbolname() : $refsym;
+
+    my $pattern_ok = sub {
+	my $p = shift;
+	return defined $p && ($inc_deprecated || !$p->{deprecated}) &&
+	       $p->arch_is_concerned($self->get_arch());
+    };
+
+    foreach my $soname ((ref($sonames) eq 'ARRAY') ? @$sonames : $sonames) {
+	my $obj = $self->get_object($soname);
+	my ($type, $pattern);
+	next unless defined $obj;
+
+	my $all_aliases = $obj->{patterns}{aliases};
+	for my $type (Dpkg::Shlibs::Symbol::ALIAS_TYPES) {
+	    if (exists $all_aliases->{$type} && keys(%{$all_aliases->{$type}})) {
+		my $aliases = $all_aliases->{$type};
+		my $converter = $aliases->{(keys %$aliases)[0]};
+		if (my $alias = $converter->convert_to_alias($name)) {
+		    if ($alias && exists $aliases->{$alias}) {
+			$pattern = $aliases->{$alias};
+			last if $pattern_ok->($pattern);
+			$pattern = undef; # otherwise not found yet
+		    }
+		}
+	    }
+	}
+
+	# Now try generic patterns and use the first that matches
+	if (not defined $pattern) {
+	    for my $p (@{$obj->{patterns}{generic}}) {
+		if ($pattern_ok->($p) && $p->matches_rawname($name)) {
+		    $pattern = $p;
+		    last;
+		}
+	    }
+	}
+	if (defined $pattern) {
+	    return (wantarray) ?
+		( symbol => $pattern, soname => $soname ) : $pattern;
+	}
+    }
+    return;
+}
+
+# merge_symbols($object, $minver)
+# Needs $Objdump->get_object($soname) as parameter
+# Do not merge symbols found in the list of (arch-specific) internal symbols.
+sub merge_symbols {
+    my ($self, $object, $minver) = @_;
+
+    my $soname = $object->{SONAME};
+    error(g_('cannot merge symbols from objects without SONAME'))
+        unless $soname;
+
+    my %include_groups = ();
+    my $groups = $self->get_field($soname, 'Allow-Internal-Symbol-Groups');
+    if (not defined $groups) {
+        $groups = $self->get_field($soname, 'Ignore-Blacklist-Groups');
+        if (defined $groups) {
+            warnings::warnif('deprecated',
+                'symbols file field "Ignore-Blacklist-Groups" is deprecated, ' .
+                'use "Allow-Internal-Symbol-Groups" instead');
+        }
+    }
+    if (defined $groups) {
+        $include_groups{$_} = 1 foreach (split ' ', $groups);
+    }
+
+    my %dynsyms;
+    foreach my $sym ($object->get_exported_dynamic_symbols()) {
+        my $name = $sym->{name} . '@' .
+                   ($sym->{version} ? $sym->{version} : 'Base');
+        my $symobj = $self->lookup_symbol($name, $soname);
+        if (symbol_is_internal($sym->{name}, \%include_groups)) {
+            next unless defined $symobj;
+
+            if ($symobj->has_tag('allow-internal')) {
+                # Allow the symbol.
+            } elsif ($symobj->has_tag('ignore-blacklist')) {
+                # Allow the symbol and warn.
+                warnings::warnif('deprecated',
+                    'symbol tag "ignore-blacklist" is deprecated, ' .
+                    'use "allow-internal" instead');
+            } else {
+                # Ignore the symbol.
+                next;
+            }
+        }
+        $dynsyms{$name} = $sym;
+    }
+
+    unless ($self->has_object($soname)) {
+	$self->create_object($soname, '');
+    }
+    # Scan all symbols provided by the objects
+    my $obj = $self->get_object($soname);
+    # invalidate the minimum version cache - it is not sufficient to
+    # invalidate in add_symbol, since we might change a minimum
+    # version for a particular symbol without adding it
+    $obj->{minver_cache} = [];
+    foreach my $name (keys %dynsyms) {
+        my $sym;
+	if ($sym = $self->lookup_symbol($name, $obj, 1)) {
+	    # If the symbol is already listed in the file
+	    $sym->mark_found_in_library($minver, $self->get_arch());
+	} else {
+	    # The exact symbol is not present in the file, but it might match a
+	    # pattern.
+	    my $pattern = $self->find_matching_pattern($name, $obj, 1);
+	    if (defined $pattern) {
+		$pattern->mark_found_in_library($minver, $self->get_arch());
+		$sym = $pattern->create_pattern_match(symbol => $name);
+	    } else {
+		# Symbol without any special info as no pattern matched
+		$sym = Dpkg::Shlibs::Symbol->new(symbol => $name,
+		                                 minver => $minver);
+	    }
+	    $self->add_symbol($sym, $obj);
+	}
+    }
+
+    # Process all symbols which could not be found in the library.
+    foreach my $sym ($self->get_symbols($soname)) {
+	if (not exists $dynsyms{$sym->get_symbolname()}) {
+	    $sym->mark_not_found_in_library($minver, $self->get_arch());
+	}
+    }
+
+    # Deprecate patterns which didn't match anything
+    for my $pattern (grep { $_->get_pattern_matches() == 0 }
+                          $self->get_patterns($soname)) {
+	$pattern->mark_not_found_in_library($minver, $self->get_arch());
+    }
+}
+
+sub is_empty {
+    my $self = shift;
+    return scalar(keys %{$self->{objects}}) ? 0 : 1;
+}
+
+sub has_object {
+    my ($self, $soname) = @_;
+    return exists $self->{objects}{$soname};
+}
+
+sub get_object {
+    my ($self, $soname) = @_;
+    return ref($soname) ? $soname : $self->{objects}{$soname};
+}
+
+sub create_object {
+    my ($self, $soname, @deps) = @_;
+    $self->{objects}{$soname} = {
+	syms => {},
+	fields => {},
+	patterns => {
+	    aliases => {},
+	    generic => [],
+	},
+	deps => [ @deps ],
+        minver_cache => []
+    };
+}
+
+sub get_dependency {
+    my ($self, $soname, $dep_id) = @_;
+    $dep_id //= 0;
+    return $self->get_object($soname)->{deps}[$dep_id];
+}
+
+sub get_smallest_version {
+    my ($self, $soname, $dep_id) = @_;
+    $dep_id //= 0;
+    my $so_object = $self->get_object($soname);
+    return $so_object->{minver_cache}[$dep_id]
+        if defined $so_object->{minver_cache}[$dep_id];
+    my $minver;
+    foreach my $sym ($self->get_symbols($so_object)) {
+        next if $dep_id != $sym->{dep_id};
+        $minver //= $sym->{minver};
+        if (version_compare($minver, $sym->{minver}) > 0) {
+            $minver = $sym->{minver};
+        }
+    }
+    $so_object->{minver_cache}[$dep_id] = $minver;
+    return $minver;
+}
+
+sub get_dependencies {
+    my ($self, $soname) = @_;
+    return @{$self->get_object($soname)->{deps}};
+}
+
+sub get_field {
+    my ($self, $soname, $name) = @_;
+    if (my $obj = $self->get_object($soname)) {
+	if (exists $obj->{fields}{$name}) {
+	    return $obj->{fields}{$name};
+	}
+    }
+    return;
+}
+
+# Tries to find a symbol like the $refsym and returns its descriptor.
+# $refsym may also be a symbol name.
+sub lookup_symbol {
+    my ($self, $refsym, $sonames, $inc_deprecated) = @_;
+    $inc_deprecated //= 0;
+    my $name = (ref $refsym) ? $refsym->get_symbolname() : $refsym;
+
+    foreach my $so ((ref($sonames) eq 'ARRAY') ? @$sonames : $sonames) {
+	if (my $obj = $self->get_object($so)) {
+	    my $sym = $obj->{syms}{$name};
+	    if ($sym and ($inc_deprecated or not $sym->{deprecated}))
+	    {
+		return (wantarray) ?
+		    ( symbol => $sym, soname => $so ) : $sym;
+	    }
+	}
+    }
+    return;
+}
+
+# Tries to find a pattern like the $refpat and returns its descriptor.
+# $refpat may also be a pattern spec.
+sub lookup_pattern {
+    my ($self, $refpat, $sonames, $inc_deprecated) = @_;
+    $inc_deprecated //= 0;
+    # If $refsym is a string, we need to create a dummy ref symbol.
+    $refpat = $self->create_symbol($refpat, dummy => 1) if ! ref($refpat);
+
+    if ($refpat && $refpat->is_pattern()) {
+	foreach my $soname ((ref($sonames) eq 'ARRAY') ? @$sonames : $sonames) {
+	    if (my $obj = $self->get_object($soname)) {
+		my $pat;
+		if (my $type = $refpat->get_alias_type()) {
+		    if (exists $obj->{patterns}{aliases}{$type}) {
+			$pat = $obj->{patterns}{aliases}{$type}{$refpat->get_symbolname()};
+		    }
+		} elsif ($refpat->get_pattern_type() eq 'generic') {
+		    for my $p (@{$obj->{patterns}{generic}}) {
+			if (($inc_deprecated || !$p->{deprecated}) &&
+			    $p->equals($refpat, versioning => 0))
+			{
+			    $pat = $p;
+			    last;
+			}
+		    }
+		}
+		if ($pat && ($inc_deprecated || !$pat->{deprecated})) {
+		    return (wantarray) ?
+			(symbol => $pat, soname => $soname) : $pat;
+		}
+	    }
+	}
+    }
+    return;
+}
+
+# Get symbol object reference either by symbol name or by a reference object.
+sub get_symbol_object {
+    my ($self, $refsym, $soname) = @_;
+    my $sym = $self->lookup_symbol($refsym, $soname, 1);
+    if (! defined $sym) {
+	$sym = $self->lookup_pattern($refsym, $soname, 1);
+    }
+    return $sym;
+}
+
+sub get_new_symbols {
+    my ($self, $ref, %opts) = @_;
+    my $with_optional = (exists $opts{with_optional}) ?
+	$opts{with_optional} : 0;
+    my @res;
+    foreach my $soname ($self->get_sonames()) {
+	next if not $ref->has_object($soname);
+
+	# Scan raw symbols first.
+	foreach my $sym (grep { ($with_optional || ! $_->is_optional())
+	                        && $_->is_legitimate($self->get_arch()) }
+	                      $self->get_symbols($soname))
+	{
+	    my $refsym = $ref->lookup_symbol($sym, $soname, 1);
+	    my $isnew;
+	    if (defined $refsym) {
+		# If the symbol exists in the $ref symbol file, it might
+		# still be new if $refsym is not legitimate.
+		$isnew = not $refsym->is_legitimate($self->get_arch());
+	    } else {
+		# If the symbol does not exist in the $ref symbol file, it does
+		# not mean that it's new. It might still match a pattern in the
+		# symbol file. However, due to performance reasons, first check
+		# if the pattern that the symbol matches (if any) exists in the
+		# ref symbol file as well.
+		$isnew = not (
+		    ($sym->get_pattern() and $ref->lookup_pattern($sym->get_pattern(), $soname, 1)) or
+		    $ref->find_matching_pattern($sym, $soname, 1)
+		);
+	    }
+	    push @res, { symbol => $sym, soname => $soname } if $isnew;
+	}
+
+	# Now scan patterns
+	foreach my $p (grep { ($with_optional || ! $_->is_optional())
+	                      && $_->is_legitimate($self->get_arch()) }
+	                    $self->get_patterns($soname))
+	{
+	    my $refpat = $ref->lookup_pattern($p, $soname, 0);
+	    # If reference pattern was not found or it is not legitimate,
+	    # considering current one as new.
+	    if (not defined $refpat or
+	        not $refpat->is_legitimate($self->get_arch()))
+	    {
+		push @res, { symbol => $p , soname => $soname };
+	    }
+	}
+    }
+    return @res;
+}
+
+sub get_lost_symbols {
+    my ($self, $ref, %opts) = @_;
+    return $ref->get_new_symbols($self, %opts);
+}
+
+
+sub get_new_libs {
+    my ($self, $ref) = @_;
+    my @res;
+    foreach my $soname ($self->get_sonames()) {
+	push @res, $soname if not $ref->get_object($soname);
+    }
+    return @res;
+}
+
+sub get_lost_libs {
+    my ($self, $ref) = @_;
+    return $ref->get_new_libs($self);
+}
+
+1;