regen/genpacksizetables.pl

   1 #!/usr/bin/perl -w
   2 # I'm assuming that you're running this on some kind of ASCII system, but
   3 # it will generate EBCDIC too. (TODO)
   4 use strict;
   5 use Encode;
   6 require 'regen/regen_lib.pl';
   7
   8 sub make_text {
   9     my ($chrmap, $letter, $unpredictable, $nocsum, $size, $condition) = @_;
  10     my $text = "    /* $letter */ $size";
  11     $text .= " | PACK_SIZE_UNPREDICTABLE" if $unpredictable;
  12     $text .= " | PACK_SIZE_CANNOT_CSUM"   if $nocsum;
  13     $text .= ",";
  14
  15     if ($condition) {
  16         $text = "#if $condition
  17 $text
  18 #else
  19     0,
  20 #endif";
  21     }
  22     return $text;
  23 }
  24
  25 sub make_tables {
  26     my %arrays;
  27
  28     my $chrmap = shift;
  29     foreach (@_) {
  30         my ($letter, $shriek, $unpredictable, $nocsum, $size, $condition) =
  31             /^([A-Za-z])(!?)\t(\S*)\t(\S*)\t([^\t\n]+)(?:\t+(.*))?$/ or
  32             die "Can't parse '$_'";
  33
  34         $size = "sizeof($size)" unless $size =~ s/^=//;
  35
  36         $arrays{$shriek ? 'shrieking' : 'normal'}{ord $chrmap->{$letter}} =
  37             make_text($chrmap, $letter,
  38                       $unpredictable, $nocsum, $size, $condition);
  39     }
  40
  41     my $text = "STATIC const packprops_t packprops[512] = {\n";
  42     foreach my $arrayname (qw(normal shrieking)) {
  43         my $array = $arrays{$arrayname} ||
  44             die "No defined entries in $arrayname";
  45         $text .= "    /* $arrayname */\n";
  46         for my $ch (0..255) {
  47             $text .= $array->{$ch} || "    0,";
  48             $text .= "\n";
  49         }
  50     }
  51     # Join "0," entries together
  52     1 while $text =~ s/\b0,\s*\n\s*0,/0, 0,/g;
  53     # But split them up again if the sequence gets too long
  54     $text =~ s/((?:\b0, ){15}0,) /$1\n    /g;
  55     # Clean up final ,
  56     $text =~ s/,$//;
  57     $text .= "};";
  58     return $text;
  59 }
  60
  61 my @lines = grep {
  62     s/#.*//;
  63     /\S/;
  64 } <DATA>;
  65
  66 my %asciimap  = map {chr $_, chr $_} 0..255;
  67
  68 # Currently, all things generated by this on EBCDIC are alphabetics, whose
  69 # positions are all the same regardless of code page, so any EBCDIC encoding
  70 # will work; just choose one
  71 my %ebcdicmap = map {chr $_, Encode::encode("posix-bc", chr $_)} 0..255;
  72
  73 my $fh = open_new('packsizetables.c', '>', { by => $0, from => 'its data'});
  74
  75 print $fh <<"EOC";
  76 #if TYPE_IS_SHRIEKING != 0x100
  77    ++++shriek offset should be 256
  78 #endif
  79
  80 typedef U8 packprops_t;
  81 #if 'J'-'I' == 1
  82 /* ASCII */
  83 @{[make_tables (\%asciimap, @lines)]}
  84 #else
  85 /* EBCDIC (or bust) */
  86 @{[make_tables (\%ebcdicmap, @lines)]}
  87 #endif
  88 EOC
  89
  90 read_only_bottom_close_and_rename($fh);
  91
  92 __DATA__
  93 #Symbol unpredictable
  94 #               nocsum  size
  95 c                       char
  96 C                       unsigned char
  97 W       *               unsigned char
  98 U       *               char
  99 s!                      short
 100 s                       =SIZE16
 101 S!                      unsigned short
 102 v                       =SIZE16
 103 n                       =SIZE16
 104 S                       =SIZE16
 105 v!                      =SIZE16
 106 n!                      =SIZE16
 107 i                       int
 108 i!                      int
 109 I                       unsigned int
 110 I!                      unsigned int
 111 j                       =IVSIZE
 112 J                       =UVSIZE
 113 l!                      long
 114 l                       =SIZE32
 115 L!                      unsigned long
 116 V                       =SIZE32
 117 N                       =SIZE32
 118 V!                      =SIZE32
 119 N!                      =SIZE32
 120 L                       =SIZE32
 121 p               *       char *
 122 w       *       *       char
 123 q                       Quad_t  IVSIZE >= 8
 124 Q                       Uquad_t IVSIZE >= 8
 125 f                       float
 126 d                       double
 127 F                       =NVSIZE
 128 D                       =LONG_DOUBLESIZE        defined(HAS_LONG_DOUBLE) && defined(USE_LONG_DOUBLE)