cf/roken-h-process.pl

   1 #!/usr/bin/perl
   2
   3 require 'getopts.pl';
   4
   5 my $debug = 0;
   6
   7 Getopts('dc:p:o:') || die "foo";
   8
   9 if ($opt_d) {
  10     $debug = 1;
  11 }
  12
  13 die "missing arg" if (!defined $opt_c || !defined $opt_p || !defined $opt_o);
  14
  15 my %defines;
  16 my $IN;
  17 my $OUT;
  18
  19 print "parse config.h\n" if ($debug);
  20
  21 open IN, $opt_c || die "failed open ${opt_c}";
  22
  23 my @nesting;
  24
  25 push @nesting, 1;
  26
  27 while (<IN>) {
  28     if (m/\s*#ifdef\s+(.*)/) {
  29         my $var = $1;
  30         if (defined $defines{$var}) {
  31             push @nesting, 1;
  32         } else {
  33             push @nesting, 0;
  34         }
  35         next;
  36     } elsif (m/\s*#ifndef\s+(.*)/) {
  37         my $var = $1;
  38         if (defined $defines{$var}) {
  39             push @nesting, 0;
  40         } else {
  41             push @nesting, 1;
  42         }
  43         next;
  44     } elsif (m/\s*#else/) {
  45         my $var = pop @nesting;
  46         $var = !$var;
  47         push @nesting, $var;
  48         next;
  49     } elsif ($nesting[$#nesting] and m/\s*#define\s+(\w+)\s+(\S+)/) {
  50         my $res = $2;
  51         $res = 1 if (!defined $res);
  52         $defines{$1} = $res;
  53     }
  54 }
  55
  56 close IN;
  57
  58 if ($debug) {
  59     foreach my $i (keys %defines) {
  60         print "k: $i v: $defines{$i}\n";
  61     }
  62 }
  63
  64 open IN, "$opt_p" || die "failed open ${opt_p}";
  65 open OUT, ">$opt_o" || die "failed open ${opt_o}";
  66
  67 print "parse roken.h.in\n" if ($debug);
  68
  69 print OUT "/* This is an OS dependent, generated file */\n";
  70 print OUT "\n";
  71 print OUT "\n";
  72 print OUT "#ifndef __ROKEN_H__\n";
  73 print OUT "#define __ROKEN_H__\n";
  74 print OUT "\n";
  75
  76 @nesting = (1);
  77
  78 while (<IN>) {
  79     if (m/\s*#ifdef\s+(.*)/) {
  80         my $var = $1;
  81         if (defined $defines{$var}) {
  82             push @nesting, 1;
  83         } else {
  84             push @nesting, 0;
  85         }
  86         next;
  87     } elsif (m/\s*#ifndef\s+(.*)/) {
  88         my $var = $1;
  89         if (defined $defines{$var}) {
  90             push @nesting, 0;
  91         } else {
  92             push @nesting, 1;
  93         }
  94         next;
  95     } elsif (m/\s*#if\s+(.*)/) {
  96         my $res = parse_if($1);
  97         print "line = $res: $1\n" if ($debug);
  98         push @nesting, $res;
  99         next;
 100     } elsif (m/\s*#elif\s+(.*)/) {
 101         my $res = pop @nesting;
 102         if ($res gt 0) {
 103             $res = -1;
 104         } else {
 105             my $res = parse_if($1);
 106         }
 107         push @nesting, $res;
 108         next;
 109     } elsif (m/\s*#else/) {
 110         my $var = pop @nesting;
 111         $var = !$var;
 112         push @nesting, $var;
 113         next;
 114     } elsif (m/\s*#endif/) {
 115         pop @nesting;
 116         next;
 117     }
 118     print "line: $_\n"  if ($debug);
 119     print "nesting dep $#{nesting}\n"  if ($debug);
 120     my $i = 0, $t = 1;
 121     while ($i le $#nesting) {
 122         $t = 0 if ($nesting[$i] le 0);
 123         print "nesting $i val $nesting[$i] -> $t\n" if ($debug);
 124         $i++;
 125     }
 126     if ($t) {
 127         print OUT;
 128     }
 129 }
 130
 131 print OUT "\n";
 132 print OUT "#endif /* __ROKEN_H__ */\n";
 133
 134
 135 close IN;
 136
 137 exit 0;
 138
 139 sub parse_if
 140 {
 141     my ($neg, $var);
 142
 143     $_ = shift;
 144
 145     if (m/^\s*$/) {
 146         print "end $_\n" if ($debug);
 147         return 1;
 148     } elsif (m/^([^&]+)\&\&(.*)$/) {
 149         print "$1 and $2\n" if ($debug);
 150         return parse_if($1) and parse_if($2);
 151     } elsif (m/^([^\|]+)\|\|(.*)$/) {
 152         print "$1 or $2\n" if ($debug);
 153         return parse_if($1) or parse_if($2);
 154     } elsif (m/^\s*(\!)?\s*defined\((\w+)\)/) {
 155         ($neg, $var) = ($1, $2);
 156         print "def: ${neg}-defined(${var})\n" if ($debug);
 157         my $res = defined $defines{$var};
 158         if ($neg eq "!") {
 159             if ($res) {
 160                 $res = 0;
 161             } else {
 162                 $res = 1;
 163             }
 164         }
 165         print "res: $res\n" if ($debug);
 166         return $res;
 167     } elsif (m/^\s*(\!)?(\w+)/) {
 168         ($neg, $var) = ($1, $2);
 169         print "var: $neg $var\n" if ($debug);
 170         my $res;
 171         if (defined $defines{$var}) {
 172             $res = $defines{$var};
 173         } else {
 174             $res = 0;
 175         }
 176         $res = ! $res if ($neg =~ m/!/);
 177         print "res: $res\n" if ($debug);
 178         return $res;
 179     }
 180     die "failed parse: $_\n";
 181 }