flexfix

Verilog Parser in Perl

#!/usr/bin/perl -w
######################################################################
#
# Copyright 2002-2009 by Wilson Snyder.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of either the GNU Lesser General Public License or the
# Perl Artistic License.
#
# 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.
#
# You should have received a copy of the Perl Artistic License
# along with this module; see the file COPYING.  If not, see
# www.cpan.org
#
######################################################################

# DESCRIPTION: Edits flex output to get around various broken flex issues.

foreach my $line (<STDIN>) {
    # Fix flex 2.5.4 namespace omission
    $line =~ s/^class istream;/\#include <iostream>\nusing namespace std;\n/;
    # Fix flex 2.5.31 redefinition
    $line =~ s!(\#define\s+yyFlexLexer\s+yyFlexLexer)!//flexfix: $1!g;
    # Fix flex 2.5.1 yytext_ptr undef
    $line =~ s!(\#undef\s+yytext_ptr)!//flexfix: $1!g;
    # Fix flex 2.5.4 and GCC 4.1.0 warn_unused_result
    $line =~ s!\(void\) *fwrite\((.*)\)!if (fwrite($1)) {}!g;
    # Fix flex 2.5.33 and GCC 4.1.2 "warning: comparison between signed and unsigned integer expressions" in YY_INPUT
    $line =~ s!for \( n = 0; n < max_size && !for ( n = 0; ((size_t)n < (size_t)max_size) && !g;
    # Fix flex 2.5.4 and GCC 4.0.2 under FLEX_DEBUG
    $line =~ s!--accepting rule at line %d !--accepting rule at line %ld !g;

    print "$line";
}