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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [contrib/] [make_sunver.pl] - Blame information for rev 775

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1 723 jeremybenn
#!/usr/bin/perl -w
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# make_sunver.pl
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#
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# This script takes at least two arguments, a GNU style version script and
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# a list of object and archive files, and generates a corresponding Sun
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# style version script as follows:
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#
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# Each glob pattern, C++ mangled pattern or literal in the input script is
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# matched against all global symbols in the input objects, emitting those
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# that matched (or nothing if no match was found).
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# A comment with the original pattern and its type is left in the output
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# file to make it easy to understand the matches.
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#
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# It uses elfdump when present (native), GNU readelf otherwise.
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# It depends on the GNU version of c++filt, since it must understand the
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# GNU mangling style.
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use FileHandle;
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use IPC::Open2;
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# Input version script, GNU style.
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my $symvers = shift;
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##########
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# Get all the symbols from the library, match them, and add them to a hash.
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my %sym_hash = ();
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# List of objects and archives to process.
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my @OBJECTS = ();
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# List of shared objects to omit from processing.
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my @SHAREDOBJS = ();
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# Filter out those input archives that have corresponding shared objects to
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# avoid adding all symbols matched in the archive to the output map.
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foreach $file (@ARGV) {
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    if (($so = $file) =~ s/\.a$/.so/ && -e $so) {
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        printf STDERR "omitted $file -> $so\n";
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        push (@SHAREDOBJS, $so);
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    } else {
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        push (@OBJECTS, $file);
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    }
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}
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# We need to detect and ignore hidden symbols.  Solaris nm can only detect
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# this in the harder to parse default output format, and GNU nm not at all,
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# so use elfdump -s in the native case and GNU readelf -s otherwise.
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# GNU objdump -t cannot be used since it produces a variable number of
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# columns.
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# The path to elfdump.
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my $elfdump = "/usr/ccs/bin/elfdump";
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if (-f $elfdump) {
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    open ELFDUMP,$elfdump.' -s '.(join ' ',@OBJECTS).'|' or die $!;
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    my $skip_arsym = 0;
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    while (<ELFDUMP>) {
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        chomp;
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        # Ignore empty lines.
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        if (/^$/) {
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            # End of archive symbol table, stop skipping.
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            $skip_arsym = 0 if $skip_arsym;
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            next;
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        }
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        # Keep skipping until end of archive symbol table.
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        next if ($skip_arsym);
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        # Ignore object name header for individual objects and archives.
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        next if (/:$/);
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        # Ignore table header lines.
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        next if (/^Symbol Table Section:/);
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        next if (/index.*value.*size/);
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        # Start of archive symbol table: start skipping.
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        if (/^Symbol Table: \(archive/) {
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            $skip_arsym = 1;
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            next;
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        }
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        # Split table.
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        (undef, undef, undef, undef, $bind, $oth, undef, $shndx, $name) = split;
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        # Error out for unknown input.
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        die "unknown input line:\n$_" unless defined($bind);
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        # Ignore local symbols.
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        next if ($bind eq "LOCL");
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        # Ignore hidden symbols.
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        next if ($oth eq "H");
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        # Ignore undefined symbols.
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        next if ($shndx eq "UNDEF");
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        # Error out for unhandled cases.
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        if ($bind !~ /^(GLOB|WEAK)/ or $oth ne "D") {
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            die "unhandled symbol:\n$_";
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        }
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        # Remember symbol.
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        $sym_hash{$name}++;
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    }
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    close ELFDUMP or die "$elfdump error";
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} else {
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    open READELF, 'readelf -s -W '.(join ' ',@OBJECTS).'|' or die $!;
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    # Process each symbol.
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    while (<READELF>) {
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        chomp;
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        # Ignore empty lines.
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        next if (/^$/);
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        # Ignore object name header.
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        next if (/^File: .*$/);
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        # Ignore table header lines.
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        next if (/^Symbol table.*contains.*:/);
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        next if (/Num:.*Value.*Size/);
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        # Split table.
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        (undef, undef, undef, undef, $bind, $vis, $ndx, $name) = split;
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        # Error out for unknown input.
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        die "unknown input line:\n$_" unless defined($bind);
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        # Ignore local symbols.
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        next if ($bind eq "LOCAL");
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        # Ignore hidden symbols.
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        next if ($vis eq "HIDDEN");
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        # Ignore undefined symbols.
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        next if ($ndx eq "UND");
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        # Error out for unhandled cases.
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        if ($bind !~ /^(GLOBAL|WEAK)/ or $vis ne "DEFAULT") {
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            die "unhandled symbol:\n$_";
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        }
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        # Remember symbol.
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        $sym_hash{$name}++;
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    }
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    close READELF or die "readelf error";
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}
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##########
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# The various types of glob patterns.
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#
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# A glob pattern that is to be applied to the demangled name: 'cxx'.
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# A glob patterns that applies directly to the name in the .o files: 'glob'.
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# This pattern is ignored; used for local variables (usually just '*'): 'ign'.
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# The type of the current pattern.
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my $glob = 'glob';
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# We're currently inside `extern "C++"', which Sun ld doesn't understand.
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my $in_extern = 0;
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# The c++filt command to use.  This *must* be GNU c++filt; the Sun Studio
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# c++filt doesn't handle the GNU mangling style.
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my $cxxfilt = $ENV{'CXXFILT'} || "c++filt";
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# The current version name.
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my $current_version = "";
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# Was there any attempt to match a symbol to this version?
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my $matches_attempted;
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# The number of versions which matched this symbol.
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my $matched_symbols;
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open F,$symvers or die $!;
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# Print information about generating this file
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print "# This file was generated by make_sunver.pl.  DO NOT EDIT!\n";
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print "# It was generated by:\n";
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printf "# %s %s %s\n", $0, $symvers, (join ' ',@ARGV);
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printf "# Omitted archives with corresponding shared libraries: %s\n",
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    (join ' ', @SHAREDOBJS) if $#SHAREDOBJS >= 0;
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print "#\n\n";
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182
while (<F>) {
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    # Lines of the form '};'
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    if (/^([ \t]*)(\}[ \t]*;[ \t]*)$/) {
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        $glob = 'glob';
186
        if ($in_extern) {
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            $in_extern--;
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            print "$1##$2";
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        } else {
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            print;
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        }
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        next;
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    }
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    # Lines of the form '} SOME_VERSION_NAME_1.0;'
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    if (/^[ \t]*\}[ \tA-Z0-9_.a-z]+;[ \t]*$/) {
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        $glob = 'glob';
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        # We tried to match symbols agains this version, but none matched.
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        # Emit dummy hidden symbol to avoid marking this version WEAK.
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        if ($matches_attempted && $matched_symbols == 0) {
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            print "  hidden:\n";
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            print "    .force_WEAK_off_$current_version = DATA S0x0 V0x0;\n";
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        }
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        print; next;
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    }
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    # Comment and blank lines
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    if (/^[ \t]*\#/) { print; next; }
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    if (/^[ \t]*$/) { print; next; }
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    # Lines of the form '{'
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    if (/^([ \t]*){$/) {
213
        if ($in_extern) {
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            print "$1##{\n";
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        } else {
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            print;
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        }
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        next;
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    }
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    # Lines of the form 'SOME_VERSION_NAME_1.1 {'
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    if (/^([A-Z0-9_.]+)[ \t]+{$/) {
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        # Record version name.
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        $current_version = $1;
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        # Reset match attempts, #matched symbols for this version.
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        $matches_attempted = 0;
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        $matched_symbols = 0;
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        print;
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        next;
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    }
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    # Ignore 'global:'
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    if (/^[ \t]*global:$/) { print; next; }
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    # After 'local:', globs should be ignored, they won't be exported.
236
    if (/^[ \t]*local:$/) {
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        $glob = 'ign';
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        print;
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        next;
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    }
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    # After 'extern "C++"', globs are C++ patterns
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    if (/^([ \t]*)(extern \"C\+\+\"[ \t]*)$/) {
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        $in_extern++;
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        $glob = 'cxx';
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        # Need to comment, Sun ld cannot handle this.
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        print "$1##$2\n"; next;
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    }
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    # Chomp newline now we're done with passing through the input file.
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    chomp;
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    # Catch globs.  Note that '{}' is not allowed in globs by this script,
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    # so only '*' and '[]' are available.
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    if (/^([ \t]*)([^ \t;{}#]+);?[ \t]*$/) {
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        my $ws = $1;
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        my $ptn = $2;
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        # Turn the glob into a regex by replacing '*' with '.*', '?' with '.'.
259
        # Keep $ptn so we can still print the original form.
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        ($pattern = $ptn) =~ s/\*/\.\*/g;
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        $pattern =~ s/\?/\./g;
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263
        if ($glob eq 'ign') {
264
            # We're in a local: * section; just continue.
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            print "$_\n";
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            next;
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        }
268
 
269
        # Print the glob commented for human readers.
270
        print "$ws##$ptn ($glob)\n";
271
        # We tried to match a symbol to this version.
272
        $matches_attempted++;
273
 
274
        if ($glob eq 'glob') {
275
            my %ptn_syms = ();
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            # Match ptn against symbols in %sym_hash.
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            foreach my $sym (keys %sym_hash) {
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                # Maybe it matches one of the patterns based on the symbol in
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                # the .o file.
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                $ptn_syms{$sym}++ if ($sym =~ /^$pattern$/);
282
            }
283
 
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            foreach my $sym (sort keys(%ptn_syms)) {
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                $matched_symbols++;
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                print "$ws$sym;\n";
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            }
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        } elsif ($glob eq 'cxx') {
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            my %dem_syms = ();
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            # Verify that we're actually using GNU c++filt.  Other versions
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            # most likely cannot handle GNU style symbol mangling.
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            my $cxxout = `$cxxfilt --version 2>&1`;
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            $cxxout =~ m/GNU/ or die "$0 requires GNU c++filt to function";
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            # Talk to c++filt through a pair of file descriptors.
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            # Need to start a fresh instance per pattern, otherwise the
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            # process grows to 500+ MB.
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            my $pid = open2(*FILTIN, *FILTOUT, $cxxfilt) or die $!;
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            # Match ptn against symbols in %sym_hash.
302
            foreach my $sym (keys %sym_hash) {
303
                # No?  Well, maybe its demangled form matches one of those
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                # patterns.
305
                printf FILTOUT "%s\n",$sym;
306
                my $dem = <FILTIN>;
307
                chomp $dem;
308
                $dem_syms{$sym}++ if ($dem =~ /^$pattern$/);
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            }
310
 
311
            close FILTOUT or die "c++filt error";
312
            close FILTIN or die "c++filt error";
313
            # Need to wait for the c++filt process to avoid lots of zombies.
314
            waitpid $pid, 0;
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            foreach my $sym (sort keys(%dem_syms)) {
317
                $matched_symbols++;
318
                print "$ws$sym;\n";
319
            }
320
        } else {
321
            # No?  Well, then ignore it.
322
        }
323
        next;
324
    }
325
    # Important sanity check.  This script can't handle lots of formats
326
    # that GNU ld can, so be sure to error out if one is seen!
327
    die "strange line `$_'";
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}
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close F;

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