#! /usr/bin/perl -w
#
# Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
# Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this library; see the file COPYING.LIB.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

use strict;
use File::Basename;
use Getopt::Long;

my $usage = basename($0) . " --prefix prefix --header header file";

my $rtype_template = quotemeta("#rtype#");
my $op_template = quotemeta("#op#");

my $prefix;
my $header;
my $enable_dfg = 0;
my $file;

my $getOptionsResult = GetOptions(
    'prefix=s' => \$prefix,
    'header=s' => \$header,
    'dfg!' => \$enable_dfg
);

$file = $ARGV[0];

die "$usage\n" unless ($header and $prefix and $file);

my $stub_template = "";
my $output_end = "";
my $stub = "";

my $rtype = "";
my $op = "";
my $if_counter = 0;
my $dfg_begin = 0;

print STDERR "Creating JIT stubs for $file \n";
open(IN, $header) or die "No such file $header";

while ( $_ = <IN> ) {
    if ( /^$prefix\_BEGIN\((.*)\)/ ) {
        $stub = $1;
        print $stub . "\n";
    }
    if ( /^$prefix\((.*)\)/ ) {
        $stub_template .= $1 . "\n";
    }
    if ( /^$prefix\_END\((.*)\)/ ) {
        $output_end .= $1 . "\n";
    }
}

close(IN);
open(IN, $file) or die "No such file $file";

while ( $_ = <IN> ) {
    if ( /^#if (.*)/ ) {
        $if_counter++;
        if ( $1 eq "ENABLE(DFG_JIT)" ) {
            $dfg_begin = $if_counter;
        }
    }
    if ( /^#endif/ ) {
        if ( $if_counter == $dfg_begin ) {
            $dfg_begin = 0;
        }
        $if_counter--;
    }
    if ( /^DEFINE_STUB_FUNCTION\((.*), (.*)\)/ ) {
        $stub = $stub_template;
        $rtype = quotemeta($1);
        $op = quotemeta($2);
        $stub =~ s/$rtype_template/$rtype/g;
        $stub =~ s/$op_template/$op/g;
        $stub =~ s/\\\*/\*/g;
        if ( $enable_dfg == 1 || $dfg_begin == 0 ) {
            print $stub;
        }
    }
}

print $output_end;

close(IN);