contrib/make_sunver.pl

   1 #!/usr/bin/perl -w
   2
   3 # make_sunver.pl
   4 #
   5 # This script takes at least two arguments, a GNU style version script and
   6 # a list of object and archive files, and generates a corresponding Sun
   7 # style version script as follows:
   8 #
   9 # Each glob pattern, C++ mangled pattern or literal in the input script is
  10 # matched against all global symbols in the input objects, emitting those
  11 # that matched (or nothing if no match was found).
  12 # A comment with the original pattern and its type is left in the output
  13 # file to make it easy to understand the matches.
  14 #
  15 # It uses elfdump when present (native), GNU readelf otherwise.
  16 # It depends on the GNU version of c++filt, since it must understand the
  17 # GNU mangling style.
  18
  19 use FileHandle;
  20 use IPC::Open2;
  21
  22 # Enforce C locale.
  23 $ENV{'LC_ALL'} = "C";
  24 $ENV{'LANG'} = "C";
  25
  26 # Input version script, GNU style.
  27 my $symvers = shift;
  28
  29 ##########
  30 # Get all the symbols from the library, match them, and add them to a hash.
  31
  32 my %sym_hash = ();
  33
  34 # List of objects and archives to process.
  35 my @OBJECTS = ();
  36
  37 # List of shared objects to omit from processing.
  38 my @SHAREDOBJS = ();
  39
  40 # Filter out those input archives that have corresponding shared objects to
  41 # avoid adding all symbols matched in the archive to the output map.
  42 foreach $file (@ARGV) {
  43     if (($so = $file) =~ s/\.a$/.so/ && -e $so) {
  44         printf STDERR "omitted $file -> $so\n";
  45         push (@SHAREDOBJS, $so);
  46     } else {
  47         push (@OBJECTS, $file);
  48     }
  49 }
  50
  51 # We need to detect and ignore hidden symbols.  Solaris nm can only detect
  52 # this in the harder to parse default output format, and GNU nm not at all,
  53 # so use elfdump -s in the native case and GNU readelf -s otherwise.
  54 # GNU objdump -t cannot be used since it produces a variable number of
  55 # columns.
  56
  57 # The path to elfdump.
  58 my $elfdump = "/usr/ccs/bin/elfdump";
  59
  60 if (-f $elfdump) {
  61     open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!;
  62     my $skip_arsym = 0;
  63
  64     while (<ELFDUMP>) {
  65         chomp;
  66
  67         # Ignore empty lines.
  68         if (/^$/) {
  69             # End of archive symbol table, stop skipping.
  70             $skip_arsym = 0 if $skip_arsym;
  71             next;
  72         }
  73
  74         # Keep skipping until end of archive symbol table.
  75         next if ($skip_arsym);
  76
  77         # Ignore object name header for individual objects and archives.
  78         next if (/:$/);
  79
  80         # Ignore table header lines.
  81         next if (/^Symbol Table Section:/);
  82         next if (/index.*value.*size/);
  83
  84         # Start of archive symbol table: start skipping.
  85         if (/^Symbol Table: \(archive/) {
  86             $skip_arsym = 1;
  87             next;
  88         }
  89
  90         # Split table.
  91         (undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split;
  92
  93         # Error out for unknown input.
  94         die "unknown input line:\n$_" unless defined($bind);
  95
  96         # Ignore local symbols.
  97         next if ($bind eq "LOCL");
  98         # Ignore hidden symbols.
  99         next if ($oth eq "H");
 100         # Ignore undefined symbols.
 101         next if ($shndx eq "UNDEF");
 102         # Error out for unhandled cases.
 103         if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") {
 104             die "unhandled symbol:\n$_";
 105         }
 106
 107         # Remember symbol.
 108         $sym_hash{$name}++;
 109     }
 110     close ELFDUMP or die "$elfdump error";
 111 } else {
 112     open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!;
 113     # Process each symbol.
 114     while (<READELF>) {
 115         chomp;
 116
 117         # Ignore empty lines.
 118         next if (/^$/);
 119
 120         # Ignore object name header.
 121         next if (/^File: .*$/);
 122
 123         # Ignore table header lines.
 124         next if (/^Symbol table.*contains.*:/);
 125         next if (/Num:.*Value.*Size/);
 126
 127         # Split table.
 128         (undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split;
 129
 130         # Error out for unknown input.
 131         die "unknown input line:\n$_" unless defined($bind);
 132
 133         # Ignore local symbols.
 134         next if ($bind eq "LOCAL");
 135         # Ignore hidden symbols.
 136         next if ($vis eq "HIDDEN");
 137         # Ignore undefined symbols.
 138         next if ($ndx eq "UND");
 139         # Error out for unhandled cases.
 140         if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") {
 141             die "unhandled symbol:\n$_";
 142         }
 143
 144         # Remember symbol.
 145         $sym_hash{$name}++;
 146     }
 147     close READELF or die "readelf error";
 148 }
 149
 150 ##########
 151 # The various types of glob patterns.
 152 #
 153 # A glob pattern that is to be applied to the demangled name: 'cxx'.
 154 # A glob patterns that applies directly to the name in the .o files: 'glob'.
 155 # This pattern is ignored; used for local variables (usually just '*'): 'ign'.
 156
 157 # The type of the current pattern.
 158 my $glob = 'glob';
 159
 160 # We're currently inside `extern "C++"', which Sun ld doesn't understand.
 161 my $in_extern = 0;
 162
 163 # The c++filt command to use.  This *must* be GNU c++filt; the Sun Studio
 164 # c++filt doesn't handle the GNU mangling style.
 165 my $cxxfilt = $ENV{'CXXFILT'} || "c++filt";
 166
 167 # The current version name.
 168 my $current_version = "";
 169
 170 # Was there any attempt to match a symbol to this version?
 171 my $matches_attempted;
 172
 173 # The number of versions which matched this symbol.
 174 my $matched_symbols;
 175
 176 open F,$symvers or die $!;
 177
 178 # Print information about generating this file
 179 print "# This file was generated by make_sunver.pl.  DO NOT EDIT!\n";
 180 print "# It was generated by:\n";
 181 printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV);
 182 printf "# Omitted archives with corresponding shared libraries: %s\n",
 183     (join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0;
 184 print "#\n\n";
 185
 186 while (<F>) {
 187     # Lines of the form '};'
 188     if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) {
 189         $glob = 'glob';
 190         if ($in_extern) {
 191             $in_extern--;
 192             print "$1##$2\n";
 193         } else {
 194             print;
 195         }
 196         next;
 197     }
 198
 199     # Lines of the form '} SOME_VERSION_NAME_1.0;'
 200     if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) {
 201         $glob = 'glob';
 202         # We tried to match symbols agains this version, but none matched.
 203         # Emit dummy hidden symbol to avoid marking this version WEAK.
 204         if ($matches_attempted && $matched_symbols == 0) {
 205             print "  hidden:\n";
 206             print "    .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n";
 207         }
 208         print; next;
 209     }
 210
 211     # Comment and blank lines
 212     if (/^[ \t]*\#/) { print; next; }
 213     if (/^[ \t]*$/) { print; next; }
 214
 215     # Lines of the form '{'
 216     if (/^([ \t]*){$/) {
 217         if ($in_extern) {
 218             print "$1##{\n";
 219         } else {
 220             print;
 221         }
 222         next;
 223     }
 224
 225     # Lines of the form 'SOME_VERSION_NAME_1.1 {'
 226     if (/^([A-Z0-9_.]+)[ \t]+{$/) {
 227         # Record version name.
 228         $current_version = $1;
 229         # Reset match attempts, #matched symbols for this version.
 230         $matches_attempted = 0;
 231         $matched_symbols = 0;
 232         print;
 233         next;
 234     }
 235
 236     # Ignore 'global:'
 237     if (/^[ \t]*global:$/) { print; next; }
 238
 239     # After 'local:', globs should be ignored, they won't be exported.
 240     if (/^[ \t]*local:$/) {
 241         $glob = 'ign';
 242         print;
 243         next;
 244     }
 245
 246     # After 'extern "C++"', globs are C++ patterns
 247     if (/^([ \t]*)(extern \"C\+\+\"[ \t]*)$/) {
 248         $in_extern++;
 249         $glob = 'cxx';
 250         # Need to comment, Sun ld cannot handle this.
 251         print "$1##$2\n"; next;
 252     }
 253
 254     # Chomp newline now we're done with passing through the input file.
 255     chomp;
 256
 257     # Catch globs.  Note that '{}' is not allowed in globs by this script,
 258     # so only '*' and '[]' are available.
 259     if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) {
 260         my $ws = $1;
 261         my $ptn = $2;
 262         # Turn the glob into a regex by replacing '*' with '.*', '?' with '.'.
 263         # Keep $ptn so we can still print the original form.
 264         ($pattern = $ptn) =~ s/\*/\.\*/g;
 265         $pattern =~ s/\?/\./g;
 266
 267         if ($glob eq 'ign') {
 268             # We're in a local: * section; just continue.
 269             print "$_\n";
 270             next;
 271         }
 272
 273         # Print the glob commented for human readers.
 274         print "$ws##$ptn ($glob)\n";
 275         # We tried to match a symbol to this version.
 276         $matches_attempted++;
 277
 278         if ($glob eq 'glob') {
 279             my %ptn_syms = ();
 280
 281             # Match ptn against symbols in %sym_hash.
 282             foreach my $sym (keys %sym_hash) {
 283                 # Maybe it matches one of the patterns based on the symbol in
 284                 # the .o file.
 285                 $ptn_syms{$sym}++ if ($sym =~ /^$pattern$/);
 286             }
 287
 288             foreach my $sym (sort keys(%ptn_syms)) {
 289                 $matched_symbols++;
 290                 print "$ws$sym;\n";
 291             }
 292         } elsif ($glob eq 'cxx') {
 293             my %dem_syms = ();
 294
 295             # Verify that we're actually using GNU c++filt.  Other versions
 296             # most likely cannot handle GNU style symbol mangling.
 297             my $cxxout = `$cxxfilt --version 2>&1`;
 298             $cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function";
 299
 300             # Talk to c++filt through a pair of file descriptors.
 301             # Need to start a fresh instance per pattern, otherwise the
 302             # process grows to 500+ MB.
 303             my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!;
 304
 305             # Match ptn against symbols in %sym_hash.
 306             foreach my $sym (keys %sym_hash) {
 307                 # No?  Well, maybe its demangled form matches one of those
 308                 # patterns.
 309                 printf FILTOUT "%s\n",$sym;
 310                 my $dem = <FILTIN>;
 311                 chomp $dem;
 312                 $dem_syms{$sym}++ if ($dem =~ /^$pattern$/);
 313             }
 314
 315             close FILTOUT or die "c++filt error";
 316             close FILTIN or die "c++filt error";
 317             # Need to wait for the c++filt process to avoid lots of zombies.
 318             waitpid $pid, 0;
 319
 320             foreach my $sym (sort keys(%dem_syms)) {
 321                 $matched_symbols++;
 322                 print "$ws$sym;\n";
 323             }
 324         } else {
 325             # No?  Well, then ignore it.
 326         }
 327         next;
 328     }
 329     # Important sanity check.  This script can't handle lots of formats
 330     # that GNU ld can, so be sure to error out if one is seen!
 331     die "strange line `$_'";
 332 }
 333 close F;