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372 lines
8.7 KiB
372 lines
8.7 KiB
8 months ago
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#!/usr/bin/perl -w
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# Check namespace cleanness of a library.
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# Allowed symbols are passed as arguments.
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# They may have trailing * = wildcard.
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# Wildcards may be also specified as *::* (e.g. K*::* for all KDE classes)
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# Symbols are listed as full function unmangled names without arguments,
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# e.g. 'foo bar* nspace::*' allows foo(), foo(int), bar(), barbar()
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# and all symbols in namespace/class nspace.
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# If an argument has comma in it, it's a filename of a file containing
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# allowed symbols, one per line.
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$thisProg = "$0"; # This programs name
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$library = "";
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$allowed_symbols = "";
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$debug = 0;
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$allowed_weak = "";
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$weak_specified = 0;
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while( defined( $ARGV[ 0 ] ))
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{
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$_ = shift;
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if( /^--verbose$|^-v$/ )
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{
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$debug = 1;
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}
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elsif( /^--help$|^-h$/ )
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{
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print STDOUT "Usage $thisProg [OPTION] ... library [allowed symbols] ...\n",
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"\n",
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"Check if the given library has only allowed public symbols.\n",
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"\n",
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" --allowweak=[symbol] allow only these weak symbols\n",
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" -v, --verbose verbosely list files processed\n",
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" -h, --help print this help, then exit\n";
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exit 0;
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}
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elsif( /^--allowweak=(.*)$/ )
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{
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$allowed_weak .= " " . $1;
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$weak_specified = 1;
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}
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elsif( /^--allowweak$/ ) # simply list all weak
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{
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$allowed_weak .= " ";
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$weak_specified = 1;
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}
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elsif( /^--*/ )
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{
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die "Invalid argument!\n";
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}
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else
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{
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if( ! $library )
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{
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$library = $_;
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}
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else
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{
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$allowed_symbols .= " " . $_;
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}
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}
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}
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if( ! $weak_specified )
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{
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$allowed_weak = "*";
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# allow all weak symbols by default
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# instances of templates and similar stuff - unfortunately includes also things from other libraries,
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# so it cannot be on by default
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}
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print STDERR "library:" . $library . "\n" if $debug;
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print STDERR "allowed_symbols:" . $allowed_symbols . "\n" if $debug;
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print STDERR "allowed_weak:" . $allowed_weak . "\n" if $debug;
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$default_symbols = "_fini _init"; # system symbols
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# on my system, every .so has :
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# A _DYNAMIC
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# A _GLOBAL_OFFSET_TABLE_
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# A __bss_start
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# A _edata
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# A _end
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# T _fini
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# T _init
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# no need to list A symbols in $default_symbols
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print STDERR "default_symbols: " . $default_symbols . "\n" if $debug;
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print STDOUT "Namespace cleanness check for " . $library . " :\n";
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$lib_file = "";
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if( $library =~ /\.la$/ )
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{
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# get the real library file from .la
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open( FILEIN, $library ) || die "Couldn't open $! !\n";
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while( $line = <FILEIN> )
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{
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if( $line =~ /library_names=\'([^ ]*).*/o )
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{
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$lib_file = $1;
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}
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}
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close( FILEIN );
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if( ! $lib_file )
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{
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print STDERR "Library file not found in .la file!\n";
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exit 1;
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}
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my $libpath = $library;
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$libpath =~ s%[^/]*$%%;
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if( -e $libpath . ".libs/" . $lib_file )
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{
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$lib_file = $libpath . ".libs/" . $lib_file;
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}
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else
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{
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$lib_file = $libpath . $lib_file;
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}
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}
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else
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{
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$lib_file = $library;
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}
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print STDERR "libfile: ". $lib_file . "\n" if $debug;
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$allowed_symbols .= " " . $default_symbols;
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sub process_symbols($\@\%\@);
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@wildcards = ();
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%exacts = ();
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@regwildcards = ();
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process_symbols( $allowed_symbols, @wildcards, %exacts, @regwildcards );
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@weak_wildcards = ();
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%weak_exacts = ();
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@weak_regwildcards = ();
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process_symbols( $allowed_weak, @weak_wildcards, %weak_exacts, @weak_regwildcards );
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# grep is for stripping not exported symbols, which don't have address (=first column)
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$nm_command = "nm -BDCg " . $lib_file . " | grep -v '^ ' |";
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# TODO how portable is this nmcheck stuff?
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print STDERR "nm command:" . $nm_command . "\n" if $debug;
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open( FILEIN, $nm_command ) || die "nm command failed\n";
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my $exit_code = 0;
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while( $line = <FILEIN> )
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{
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my $type;
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my $symbol;
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if( $line =~ /^[^ ]* (.) (.*)$/o )
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{
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$type = $1;
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$symbol = $2;
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}
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else
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{
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die "Invalid line: " . $line . "\n";
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}
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print STDERR "Type: " . $type . " , symbol: " . $symbol . "\n" if $debug;
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if( $type eq "A" )
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{ # these should be system symbols, so ignore them
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next;
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}
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my $orig_symbol = $symbol;
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if( $symbol =~ /\(anonymous namespace\)/o )
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{ # TODO tell to prefer named namespaces? (shorter symbols)
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next;
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}
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# strip prefixes
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# the :: appending is to make "CLASS::*" work also for "vtable for CLASS"
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$symbol =~ s/^typeinfo for (.*)$/$1::/o;
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$symbol =~ s/^typeinfo fn for (.*)$/$1::/o;
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$symbol =~ s/^typeinfo name for (.*)$/$1::/o;
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$symbol =~ s/^vtable for (.*)$/$1::/o;
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$symbol =~ s/^guard variable for (.*)$/$1::/o;
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$symbol =~ s/^reference temporary for (.*)$/$1::/o;
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$symbol =~ s/^VTT for (.*)$/$1::/o;
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$symbol =~ s/^virtual thunk \[[^\]]*\] to (.*)$/$1::/o;
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$symbol =~ s/^non-virtual thunk \[[^\]]*\] to (.*)$/$1::/o;
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$symbol =~ s/^covariant return thunk \[[^\]]*\] to (.*)$/$1::/o;
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$symbol =~ s/^construction vtable thunk for (.*)$/$1::/o;
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$symbol =~ s/^construction vtable for .*-in-(.*) [0-9]*$/$1::/o;
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# templates seem to have also return types mangled in their name, and nm prints it too
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# they have also template arguments in the symbol
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# get rid of both of those
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while( $symbol =~ /<.*>/o )
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{
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$symbol =~ s/<[^<>]*>//o; # strip innermost <>
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}
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if( $symbol !~ /operator\(\)/o )
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{
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$symbol =~ s/ ?\(.*\).*$//o; # strip () and all after it
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}
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else
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{
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$symbol =~ s/(^|:| )operator\(\) ?\(.*\).*$//o; # strip () and all after it
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}
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$symbol =~ s/\[.*\] *$//o; # strip [in-charge] etc.
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if( $symbol =~ /(^|:| )operator /o )
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{
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$symbol =~ s/.* ([^\s]*)operator /$1/o; # strip everything before 'X::operator blah'
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}
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else
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{
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$symbol =~ s/.* ([^\s]+) *$/$1/o; # get last word (strip return type)
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}
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# print STDERR "Processed symbol: " . $symbol . "\n" if $debug;
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my $found = 0;
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if( $exacts{ $symbol } )
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{
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$found = 1;
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}
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if( ! $found )
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{
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for my $wild ( @wildcards )
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{
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if( index( $symbol, $wild ) == 0 )
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{
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$found = 1;
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last;
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}
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}
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}
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if( ! $found )
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{
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for my $wild ( @regwildcards )
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{
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if( $symbol =~ /^$wild$/ )
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{
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$found = 1;
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last;
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}
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}
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}
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if( ( ! $found ) && ( $type eq "W" || $type eq "V" ))
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{
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if( $weak_exacts{ $symbol } )
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{
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$found = 1;
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}
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if( ! $found )
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{
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for my $wild ( @weak_wildcards )
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{
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if( index( $symbol, $wild ) == 0 )
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{
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$found = 1;
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last;
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}
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}
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}
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if( ! $found )
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{
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for my $wild ( @weak_regwildcards )
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{
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if( $symbol =~ /^$wild$/ )
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{
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$found = 1;
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last;
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}
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}
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}
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}
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if( ! $found )
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{
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print STDERR "Public symbol " . $orig_symbol . " is not allowed!\n";
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$exit_code = 1;
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}
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}
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close( FILEIN );
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print STDOUT $exit_code == 0 ? "OK\n" : "FAILED\n";
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exit $exit_code;
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sub process_symbols($\@\%\@)
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{
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my $allowed_symbols = $_[ 0 ];
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my $wildcards_ref = $_[ 1 ];
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my $exacts_ref = $_[ 2 ];
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my $regwildcards_ref = $_[ 3 ];
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$allowed_symbols =~ s/^ *//o; # strip whitespace
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$allowed_symbols =~ s/ *$//o;
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if( $allowed_symbols eq "NONE" )
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{
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$allowed_symbols = "";
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}
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my @symbols1 = split( ' ', $allowed_symbols );
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my $i = 0;
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my @symbols2 = ();
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while( defined( $symbols1[ $i ] ))
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{
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my $symbol = $symbols1[ $i ];
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if( $symbol =~ /\./ ) # dot in name -> file
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{
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open( SYMIN, $symbol ) || die ( "Cannot open file " . $symbol . "!" );
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while( $line = <SYMIN> )
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{
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$line =~ s/^\s*//o; # strip whitespace
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$line =~ s/\s*$//o;
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if( $line !~ /^$/o # empty line
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&& $line !~ /^\s*#/ ) # comment line starting with #
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{
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$symbols2[ $#symbols2 + 1 ] = $line;
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}
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}
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close( SYMIN );
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}
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else
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{
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$symbols2[ $#symbols2 + 1 ] = $symbol;
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}
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$i++;
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}
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$i = 0;
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while( defined( $symbols2[ $i ] ))
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{
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my $symbol = $symbols2[ $i ];
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if( $symbol =~ /__/
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|| $symbol =~ /^_[A-Z]/ )
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{ # ISO C++ 2.10.2
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die "Symbols containing a double underscore or beginning with an underscore and an upper-case letter are reserved!\n";
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}
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elsif( $symbol eq "main"
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|| $symbol eq "main*" )
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{
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die "Symbol main is not allowed!\n";
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}
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if( $symbol =~ /^([^\*]*)\*$/o # trailing * without any * before it
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&& $symbol !~ /operator\*$/o )
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{
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print STDERR "wildcard:" . $symbol . "\n" if $debug;
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$wildcards_ref->[ $#{$wildcards_ref} + 1 ] = $1;
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}
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elsif( $symbol =~ /\*$/o
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&& ( $symbol =~ /\*::/o || $symbol =~ /::\*/o )
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&& $symbol !~ /^\*/o
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&& $symbol !~ /operator\*$/o )
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{
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print STDERR "regwildcard:" . $symbol . "\n" if $debug;
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$symbol =~ s/\*/\.\*/go; # change * to .* (regexp)
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$regwildcards_ref->[ $#{$regwildcards_ref} + 1 ] = $symbol;
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}
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else
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{
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print STDERR "exact:" . $symbol . "\n" if $debug;
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$exacts_ref->{ $symbol } = 1;
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}
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$i++;
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}
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}
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