#!/usr/bin/env perl
# See copyright, etc in below POD section.
######################################################################

use warnings;
use Getopt::Long;
use IO::File;
use Pod::Usage;
use strict;
use vars qw($Debug);

our @Items;

#======================================================================
# main

$Debug = 0;
my $Opt_Srcdir = ".";
Getopt::Long::config("pass_through", "no_auto_abbrev");
if (! GetOptions(
          "help"        => \&usage,
          "debug"       => sub { $Debug = 1; },
          "srcdir=s"    => \$Opt_Srcdir,
          "<>"          => sub { die "%Error: Unknown parameter: $_[0],"; },
    )) {
    usage();
}

read_keys("$Opt_Srcdir/../include/verilated_cov_key.h");
lint();
write_keys("$Opt_Srcdir/../include/verilated_cov_key.h");

#----------------------------------------------------------------------

sub usage {
    pod2usage(-verbose=>2, -exitval=>0, -output=>\*STDOUT);
    exit(1);  # Unreachable
}

#######################################################################

sub read_keys {
    my $filename = shift;

    my $fh = IO::File->new("<$filename") or die "%Error: $! $filename,";
    while (defined (my $line = $fh->getline())) {
        $line =~ s/\/\/.*$//;
        next if $line =~ /^\s*$/;
        if ($line =~ /^\s*VLCOVGEN_ITEM/) {
            $line =~ /^\s*VLCOVGEN_ITEM *\( *"([^"]+)" *\)/
                or die "%Error: $filename:$.: Misformed VLCOVGEN_ITEM line,";
            my @data;
            my $code = "\@data = ($1);";
            eval $code;
            die "%Error: $filename:$.: Parsing '$code': $@," if $@;
            push @Items, {@data};
        }
    }
}

#######################################################################

sub lint {
    my %shorts;
    my $ok = 1;
    foreach my $itemref (@Items) {
        if ($shorts{$itemref->{short}}) {
            warn "%Error: Duplicate short code: $itemref->{short},";
            $ok = 0;
        }
        $shorts{$itemref->{short}} = 1;
    }
    return $ok;
}

sub write_keys {
    my $filename = shift;

    my $fh = IO::File->new("<$filename") or die "%Error: $! $filename\n";

    my @in;
    my @out;
    my $deleting;
    while (defined(my $line = $fh->getline)) {
        push @in, $line;
        if ($line =~ /VLCOVGEN_CIK_AUTO_EDIT_BEGIN/) {
            $deleting = 1;
            push @out, $line;
            foreach my $keyref (sort {$a->{name} cmp $b->{name}} @Items) {
                push @out, sprintf("#define VL_CIK_%s \"%s\"\n",
                                   uc $keyref->{name}, $keyref->{short});
            }
        }
        elsif ($line =~ /VLCOVGEN_SHORT_AUTO_EDIT_BEGIN/) {
            $deleting = 1;
            push @out, $line;
            foreach my $keyref (sort {$a->{name} cmp $b->{name}} @Items) {
                push @out, sprintf("        if (key == \"%s\") return VL_CIK_%s;\n",
                                   $keyref->{name}, uc $keyref->{name});
            }
        }
        elsif ($line =~ /VLCOVGEN_.*AUTO_EDIT_END/) {
            $deleting = 0;
            push @out, $line;
        }
        elsif ($deleting) {
        }
        else {
            push @out, $line;
        }
    }
    $fh->close;

    my $ok = join("", @out) eq join("", @in);
    if (!$ok) {
        my $fh = IO::File->new(">$filename") or die "%Error: $! writing $filename\n";
        $fh->print(join "", @out);
        $fh->close;
    }
}


#######################################################################
__END__

=pod

=head1 NAME

vlcovgen - Generate verilated_cov headers to reduce C++ code duplication

=head1 SYNOPSIS

  (called from make rules)
  vlcovgen

=head1 DESCRIPTION

Generates several files for Verilator compilations.

=head1 ARGUMENTS

=over 4

=item --help

Displays this message and program version and exits.

=back

=head1 DISTRIBUTION

Copyright 2002-2020 by Wilson Snyder.  Verilator is free software; you can
redistribute it and/or modify it under the terms of either the GNU Lesser
General Public License Version 3 or the Perl Artistic License Version 2.0.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
more details.

=head1 AUTHORS

Wilson Snyder <wsnyder@wsnyder.org>

=head1 SEE ALSO

=cut

######################################################################
### Local Variables:
### compile-command: "./vlcovgen --srcdir ."
### End:
