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|
#!/usr/bin/perl
# Pure Data Packet - scafc: scaf compiler.
# Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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 GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# set this if you want to enable/disable optimizing
$optimize = 1;
# this parses a single scaf line
# it is not very intelligent. only looks for 1 def on a line
# todo: change later so it can read multiple lines
sub remove_illegal_characters {
my $line = shift;
$$line =~ s/\+/_PLUS_/g;
$$line =~ s/-/_MINUS_/g;
$$line =~ s/\@/_AT_/g;
$$line =~ s/:/_COLON_/g;
$$line =~ s/\?/_QMARK_/g;
$$line =~ s/<</_SHIFT_/g;
$$line =~ s/</_ST_/g;
$$line =~ s/>/_GT_/g;
$$line =~ s/=/_EQ_/g;
$$line =~ s/\(/_OPEN_/g;
$$line =~ s/\)/_CLOSE_/g;
}
sub parse_scaf_line {
my $word, $def, $sub;
shift;
# this transforms the source into a parsed assembly like form
# a word label: "<word>:<ret>"
# a word definition line "<tab><word><ret>"
# last def = <ret><ret>
# dont process if line doesn't have a def
# first remove comments
s/\(\s+(\S+\s+)*?\)//g;
if (m/:\s+/){
# separate word and definition
m/:\s+(\S+)\s+(.*)/;
$word = $1;
$def = $2;
# remove illegal characters;
remove_illegal_characters \$word;
remove_illegal_characters \$def;
# format definition in asm style
$def =~ s/(\S+)(\s*)/\t$1\n/g;
# replace ; by r
$def =~ s/\s+;\s*/\n\tr\n/;
# put word: def into one string
$sub = "$word:\n$def\n";
# debug
#$sub =~ s/\t/<tab>/g;
#$sub =~ s/\n/<ret>\n/g;
#print "$sub";
return $sub;
}
};
# load and parse scaf source file
sub load_source {
my $filename = shift;
open(SOURCE, $filename) or die "Can't locate source module $filename\n";
my @parsedsource;
while (<SOURCE>){
my $sub = parse_scaf_line $_;
if ($sub) {
push @parsedsource, ($sub);
}
}
close(SOURCE);
return @parsedsource;
}
# this routine parses the optimization rules
sub load_optim {
my $filename = shift;
open(OPTIM, $filename) or die "Can't locate optimization rule file $filename\n";
my @parsedoptim;
while (<OPTIM>){
unless (m/\A\#/){
if (m/\"\s*(.*?)\s*\".*?\"\s*(.*?)\s*\"/)
{
my $source = $1;
my $dest = $2;
$source =~ s/\s+/\n\t/;
$dest =~ s/\s+/\n\t/;
$source = "\t$source\n";
$dest = "\t$dest\n";
remove_illegal_characters \$source;
remove_illegal_characters \$dest;
push @parsedoptim, ("$source:$dest");
}
}
}
close(OPTIM);
return @parsedoptim;
}
# inline one parsed source's definitions into another parsed source's
sub inline_defs {
my $dest = shift;
my $source = shift;
#print @$dest;
#print @$source;
# loop over file with inline defs
foreach (@$source) {
#print "<SUB>$_</SUB>\n";
m/(\S+):\n(.*)\tr\n/s;
my $def = "\t$1\n";
my $body = $2;
#print "<DEF>$def</DEF>\n";
#print "<BODY>$body</BODY>\n";
foreach (@$dest) {
s/$def/$body/g;
}
}
}
# this changes <WORD> to c <WORD> or j <WORD> all defined words
# the undefined words are supposed to be asm macros
sub call_defs {
my $dest = shift;
foreach (@$dest){
m/(\S+):\n/s;
my $word = $1;
foreach (@$dest){
s/\t$word\n\tr\n/\tj $word\n/sg;
s/\t$word\n/\tc $word\n/sg;
}
}
}
# substitue word sequences in dest using optim table
sub subst_optim {
my $dest = shift;
my $optim = shift;
foreach (@$optim){
m/(.*?):(.*)/s;
my $key = $1;
my $subst = $2;
foreach (@$dest){
s/$key/$subst/sg;
}
}
}
# add directives to produce global symbols
# global symbols need to start with carule_
sub global_syms {
my $source = shift;
foreach (@$source){
s/rule_(\S+):\n/.globl\trule_$1\n.type\trule_$1,\@function\nrule_$1:\n/sg;
}
}
# create an array with names for bookkeeping
sub name_array {
my @namearray;
my $source = shift;
push @namearray, (".globl rulenames\nrulenames:\n");
foreach (@$source){
if (m/rule_(\S+):/s){
push @namearray, (".asciz\t\"$1\"\n");
}
}
push @namearray, (".byte\t0\n");
return @namearray;
}
# main program body
$dir=".";
$source = "-";
# parse command line
foreach (@ARGV){
if (m/-I(.*)/) {
$dir = $1;
}
else {
$source = $_;
}
}
$kernel = "$dir/kernel.scaf";
$macro = "$dir/scafmacro.s";
$rules = "$dir/optim.rules";
# load files
@psource = load_source $source;
@pkernel = load_source $kernel;
@poptim = load_optim $rules;
# substitute kernel defs in source
if ($optimize) {subst_optim \@psource, \@poptim;}
inline_defs \@psource, \@pkernel;
if ($optimize) {subst_optim \@psource, \@poptim;}
call_defs \@psource;
global_syms \@psource;
@pnames = name_array \@psource;
# print out asm file
print ".include \"$macro\"\n\n";
print @psource;
print @pnames;
|
