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#!/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;

# 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";

        } 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;