c3-lang/libffi/make_sunver.pl

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• Hash : ca112537
  Author :
  Date : 2019-10-26T07:26:30
  

  Add missing build script, make_sunver.pl.
  

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• make_sunver.pl

• #!/usr/bin/perl -w
  
  # make_sunver.pl
  #
  # This script takes at least two arguments, a GNU style version script and
  # a list of object and archive files, and generates a corresponding Sun
  # style version script as follows:
  #
  # Each glob pattern, C++ mangled pattern or literal in the input script is
  # matched against all global symbols in the input objects, emitting those
  # that matched (or nothing if no match was found).
  # A comment with the original pattern and its type is left in the output
  # file to make it easy to understand the matches.
  #
  # It uses elfdump when present (native), GNU readelf otherwise.
  # It depends on the GNU version of c++filt, since it must understand the
  # GNU mangling style.
  
  use FileHandle;
  use IPC::Open2;
  
  # Enforce C locale.
  $ENV{'LC_ALL'} = "C";
  $ENV{'LANG'} = "C";
  
  # Input version script, GNU style.
  my $symvers = shift;
  
  ##########
  # Get all the symbols from the library, match them, and add them to a hash.
  
  my %sym_hash = ();
  
  # List of objects and archives to process.
  my @OBJECTS = ();
  
  # List of shared objects to omit from processing.
  my @SHAREDOBJS = ();
  
  # Filter out those input archives that have corresponding shared objects to
  # avoid adding all symbols matched in the archive to the output map.
  foreach $file (@ARGV) {
      if (($so = $file) =~ s/\.a$/.so/ && -e $so) {
  	printf STDERR "omitted $file -> $so\n";
  	push (@SHAREDOBJS, $so);
      } else {
  	push (@OBJECTS, $file);
      }
  }
  
  # We need to detect and ignore hidden symbols.  Solaris nm can only detect
  # this in the harder to parse default output format, and GNU nm not at all,
  # so use elfdump -s in the native case and GNU readelf -s otherwise.
  # GNU objdump -t cannot be used since it produces a variable number of
  # columns.
  
  # The path to elfdump.
  my $elfdump = "/usr/ccs/bin/elfdump";
  
  if (-f $elfdump) {
      open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!;
      my $skip_arsym = 0;
  
      while (<ELFDUMP>) {
  	chomp;
  
  	# Ignore empty lines.
  	if (/^$/) {
  	    # End of archive symbol table, stop skipping.
  	    $skip_arsym = 0 if $skip_arsym;
  	    next;
  	}
  
  	# Keep skipping until end of archive symbol table.
  	next if ($skip_arsym);
  
  	# Ignore object name header for individual objects and archives.
  	next if (/:$/);
  
  	# Ignore table header lines.
  	next if (/^Symbol Table Section:/);
  	next if (/index.*value.*size/);
  
  	# Start of archive symbol table: start skipping.
  	if (/^Symbol Table: \(archive/) {
  	    $skip_arsym = 1;
  	    next;
  	}
  
  	# Split table.
  	(undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split;
  
  	# Error out for unknown input.
  	die "unknown input line:\n$_" unless defined($bind);
  
  	# Ignore local symbols.
  	next if ($bind eq "LOCL");
  	# Ignore hidden symbols.
  	next if ($oth eq "H");
  	# Ignore undefined symbols.
  	next if ($shndx eq "UNDEF");
  	# Error out for unhandled cases.
  	if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") {
  	    die "unhandled symbol:\n$_";
  	}
  
  	# Remember symbol.
  	$sym_hash{$name}++;
      }
      close ELFDUMP or die "$elfdump error";
  } else {
      open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!;
      # Process each symbol.
      while (<READELF>) {
  	chomp;
  
  	# Ignore empty lines.
  	next if (/^$/);
  
  	# Ignore object name header.
  	next if (/^File: .*$/);
  
  	# Ignore table header lines.
  	next if (/^Symbol table.*contains.*:/);
  	next if (/Num:.*Value.*Size/);
  
  	# Split table.
  	(undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split;
  
  	# Error out for unknown input.
  	die "unknown input line:\n$_" unless defined($bind);
  
  	# Ignore local symbols.
  	next if ($bind eq "LOCAL");
  	# Ignore hidden symbols.
  	next if ($vis eq "HIDDEN");
  	# Ignore undefined symbols.
  	next if ($ndx eq "UND");
  	# Error out for unhandled cases.
  	if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") {
  	    die "unhandled symbol:\n$_";
  	}
  
  	# Remember symbol.
  	$sym_hash{$name}++;
      }
      close READELF or die "readelf error";
  }
  
  ##########
  # The various types of glob patterns.
  #
  # A glob pattern that is to be applied to the demangled name: 'cxx'.
  # A glob patterns that applies directly to the name in the .o files: 'glob'.
  # This pattern is ignored; used for local variables (usually just '*'): 'ign'.
  
  # The type of the current pattern.
  my $glob = 'glob';
  
  # We're currently inside `extern "C++"', which Sun ld doesn't understand.
  my $in_extern = 0;
  
  # The c++filt command to use.  This *must* be GNU c++filt; the Sun Studio
  # c++filt doesn't handle the GNU mangling style.
  my $cxxfilt = $ENV{'CXXFILT'} || "c++filt";
  
  # The current version name.
  my $current_version = "";
  
  # Was there any attempt to match a symbol to this version?
  my $matches_attempted;
  
  # The number of versions which matched this symbol.
  my $matched_symbols;
  
  open F,$symvers or die $!;
  
  # Print information about generating this file
  print "# This file was generated by make_sunver.pl.  DO NOT EDIT!\n";
  print "# It was generated by:\n";
  printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV);
  printf "# Omitted archives with corresponding shared libraries: %s\n",
      (join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0;
  print "#\n\n";
  
  while (<F>) {
      # Lines of the form '};'
      if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) {
  	$glob = 'glob';
  	if ($in_extern) {
  	    $in_extern--;
  	    print "$1##$2\n";
  	} else {
  	    print;
  	}
  	next;
      }
  
      # Lines of the form '} SOME_VERSION_NAME_1.0;'
      if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) {
  	$glob = 'glob';
  	# We tried to match symbols agains this version, but none matched.
  	# Emit dummy hidden symbol to avoid marking this version WEAK.
  	if ($matches_attempted && $matched_symbols == 0) {
  	    print "  hidden:\n";
  	    print "    .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n";
  	}
  	print; next;
      }
  
      # Comment and blank lines
      if (/^[ \t]*\#/) { print; next; }
      if (/^[ \t]*$/) { print; next; }
  
      # Lines of the form '{'
      if (/^([ \t]*){$/) {
  	if ($in_extern) {
  	    print "$1##{\n";
  	} else {
  	    print;
  	}
  	next;
      }
  
      # Lines of the form 'SOME_VERSION_NAME_1.1 {'
      if (/^([A-Z0-9_.]+)[ \t]+{$/) {
  	# Record version name.
  	$current_version = $1;
  	# Reset match attempts, #matched symbols for this version.
  	$matches_attempted = 0;
  	$matched_symbols = 0;
  	print;
  	next;
      }
  
      # Ignore 'global:'
      if (/^[ \t]*global:$/) { print; next; }
  
      # After 'local:', globs should be ignored, they won't be exported.
      if (/^[ \t]*local:$/) {
  	$glob = 'ign';
  	print;
  	next;
      }
  
      # After 'extern "C++"', globs are C++ patterns
      if (/^([ \t]*)(extern \"C\+\+\"[ \t]*)$/) {
  	$in_extern++;
  	$glob = 'cxx';
  	# Need to comment, Sun ld cannot handle this.
  	print "$1##$2\n"; next;
      }
  
      # Chomp newline now we're done with passing through the input file.
      chomp;
  
      # Catch globs.  Note that '{}' is not allowed in globs by this script,
      # so only '*' and '[]' are available.
      if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) {
  	my $ws = $1;
  	my $ptn = $2;
  	# Turn the glob into a regex by replacing '*' with '.*', '?' with '.'.
  	# Keep $ptn so we can still print the original form.
  	($pattern = $ptn) =~ s/\*/\.\*/g;
  	$pattern =~ s/\?/\./g;
  
  	if ($glob eq 'ign') {
  	    # We're in a local: * section; just continue.
  	    print "$_\n";
  	    next;
  	}
  
  	# Print the glob commented for human readers.
  	print "$ws##$ptn ($glob)\n";
  	# We tried to match a symbol to this version.
  	$matches_attempted++;
  
  	if ($glob eq 'glob') {
  	    my %ptn_syms = ();
  
  	    # Match ptn against symbols in %sym_hash.
  	    foreach my $sym (keys %sym_hash) {
  		# Maybe it matches one of the patterns based on the symbol in
  		# the .o file.
  		$ptn_syms{$sym}++ if ($sym =~ /^$pattern$/);
  	    }
  
  	    foreach my $sym (sort keys(%ptn_syms)) {
  		$matched_symbols++;
  		print "$ws$sym;\n";
  	    }
  	} elsif ($glob eq 'cxx') {
  	    my %dem_syms = ();
  
  	    # Verify that we're actually using GNU c++filt.  Other versions
  	    # most likely cannot handle GNU style symbol mangling.
  	    my $cxxout = `$cxxfilt --version 2>&1`;
  	    $cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function";
  
  	    # Talk to c++filt through a pair of file descriptors.
  	    # Need to start a fresh instance per pattern, otherwise the
  	    # process grows to 500+ MB.
  	    my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!;
  
  	    # Match ptn against symbols in %sym_hash.
  	    foreach my $sym (keys %sym_hash) {
  		# No?  Well, maybe its demangled form matches one of those
  		# patterns.
  		printf FILTOUT "%s\n",$sym;
  		my $dem = <FILTIN>;
  		chomp $dem;
  		$dem_syms{$sym}++ if ($dem =~ /^$pattern$/);
  	    }
  
  	    close FILTOUT or die "c++filt error";
  	    close FILTIN or die "c++filt error";
  	    # Need to wait for the c++filt process to avoid lots of zombies.
  	    waitpid $pid, 0;
  
  	    foreach my $sym (sort keys(%dem_syms)) {
  		$matched_symbols++;
  		print "$ws$sym;\n";
  	    }
  	} else {
  	    # No?  Well, then ignore it.
  	}
  	next;
      }
      # Important sanity check.  This script can't handle lots of formats
      # that GNU ld can, so be sure to error out if one is seen!
      die "strange line `$_'";
  }
  close F;
  

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