regs.pl

   1 #!/usr/bin/perl
   2 #
   3 # Read regs.dat and output regs.h and regs.c (included in names.c)
   4 #
   5
   6 $nline = 0;
   7
   8 sub toint($) {
   9     my($v) = @_;
  10
  11     return ($v =~ /^0/) ? oct $v : $v+0;
  12 }
  13
  14 sub process_line($) {
  15     my($line) = @_;
  16     my @v;
  17
  18     if ( $line !~ /^\s*(\S+)\s*(\S+)\s*(\S+)\s*([0-9]+)$/i ) {
  19         die "regs.dat:$nline: invalid input\n";
  20     }
  21     $reg      = $1;
  22     $aclass   = $2;
  23     $dclasses = $3;
  24     $x86regno = toint($4);
  25
  26     if ($reg =~ /^(.*[^0-9])([0-9]+)\-([0-9]+)(|[^0-9].*)$/) {
  27         $nregs = $3-$2+1;
  28         $reg = $1.$2.$4;
  29         $reg_nr = $2;
  30         $reg_prefix = $1;
  31         $reg_suffix = $4;
  32     } else {
  33         $nregs = 1;
  34         undef $reg_prefix, $reg_suffix;
  35     }
  36
  37     while ($nregs--) {
  38         $regs{$reg} = $aclass;
  39         $regvals{$reg} = $x86regno;
  40
  41         foreach $dclass (split(/,/, $dclasses)) {
  42             if ( !defined($disclass{$dclass}) ) {
  43                 $disclass{$dclass} = [];
  44             }
  45
  46             $disclass{$dclass}->[$x86regno] = $reg;
  47         }
  48
  49         # Compute the next register, if any
  50         if (defined($reg_prefix)) {
  51             $x86regno++;
  52             $reg_nr++;
  53             $reg = sprintf("%s%u%s", $reg_prefix, $reg_nr, $reg_suffix);
  54         } else {
  55             # Not a dashed sequence
  56             die if ($nregs);
  57         }
  58     }
  59 }
  60
  61 ($fmt, $file) = @ARGV;
  62
  63 %regs = ();
  64 %regvals = ();
  65 %disclass = ();
  66 open(REGS, "< ${file}") or die "$0: Cannot open $file\n";
  67 while ( defined($line = <REGS>) ) {
  68     $nline++;
  69
  70     chomp $line;
  71     $line =~ s/\s*(\#.*|)$//;
  72
  73     next if ( $line eq '' );
  74
  75     process_line($line);
  76 }
  77 close(REGS);
  78
  79 if ( $fmt eq 'h' ) {
  80     # Output regs.h
  81     print "/* automatically generated from $file - do not edit */\n\n";
  82     $expr_regs = 1;
  83     printf "#define EXPR_REG_START %d\n", $expr_regs;
  84     print "enum reg_enum {\n";
  85     $attach = ' = EXPR_REG_START'; # EXPR_REG_START == 1
  86     foreach $reg ( sort(keys(%regs)) ) {
  87         print "    R_\U${reg}\E${attach},\n";
  88         $attach = '';
  89         $expr_regs++;
  90     }
  91     print "    REG_ENUM_LIMIT,\n";
  92     # Unfortunately the code uses both 0 and -1 as "no register" in
  93     # different places...
  94     print "    R_zero = 0,\n";
  95     print "    R_none = -1";
  96     print "};\n\n";
  97     printf "#define EXPR_REG_END %d\n", $expr_regs-1;
  98     foreach $reg ( sort(keys(%regs)) ) {
  99         printf "#define %-15s %2d\n", "REG_NUM_\U${reg}", $regvals{$reg};
 100     }
 101     print "\n";
 102 } elsif ( $fmt eq 'c' ) {
 103     # Output regs.c
 104     print "/* automatically generated from $file - do not edit */\n\n";
 105     print "#include \"tables.h\"\n\n";
 106     print "const char * const nasm_reg_names[] = "; $ch = '{';
 107     # This one has no dummy entry for 0
 108     foreach $reg ( sort(keys(%regs)) ) {
 109         print "$ch\n    \"${reg}\"";
 110         $ch = ',';
 111     }
 112     print "\n};\n";
 113 } elsif ( $fmt eq 'fc' ) {
 114     # Output regflags.c
 115     print "/* automatically generated from $file - do not edit */\n\n";
 116     print "#include \"tables.h\"\n";
 117     print "#include \"nasm.h\"\n\n";
 118     print "const int32_t nasm_reg_flags[] = {\n";
 119     print "    0";              # Dummy entry for 0
 120     foreach $reg ( sort(keys(%regs)) ) {
 121         print ",\n    ", $regs{$reg}; # Print the class of the register
 122     }
 123     print "\n};\n";
 124 } elsif ( $fmt eq 'vc' ) {
 125     # Output regvals.c
 126     print "/* automatically generated from $file - do not edit */\n\n";
 127     print "#include \"tables.h\"\n\n";
 128     print "const int nasm_regvals[] = {\n";
 129     print "    -1";             # Dummy entry for 0
 130     foreach $reg ( sort(keys(%regs)) ) {
 131         printf ",\n    %2d", $regvals{$reg}; # Print the regval of the register
 132     }
 133     print "\n};\n";
 134 } elsif ( $fmt eq 'dc' ) {
 135     # Output regdis.c
 136     print "/* automatically generated from $file - do not edit */\n\n";
 137     print "#include \"regs.h\"\n\n";
 138     foreach $class ( sort(keys(%disclass)) ) {
 139         printf "const enum reg_enum nasm_rd_%-8s[%2d] = {",
 140                 $class, scalar @{$disclass{$class}};
 141         @foo = @{$disclass{$class}};
 142         @bar = ();
 143         for ( $i = 0 ; $i < scalar(@foo) ; $i++ ) {
 144             if (defined($foo[$i])) {
 145                 push(@bar, "R_\U$foo[$i]\E");
 146             } else {
 147                 die "$0: No register name for class $class, value $i\n";
 148             }
 149         }
 150         print join(',', @bar), "};\n";
 151     }
 152 } elsif ( $fmt eq 'dh' ) {
 153     # Output regdis.h
 154     print "/* automatically generated from $file - do not edit */\n";
 155     foreach $class ( sort(keys(%disclass)) ) {
 156         printf "const enum reg_enum nasm_rd_%-8s[%2d];\n",
 157                 $class, scalar @{$disclass{$class}};
 158     }
 159 } else {
 160     die "$0: Unknown output format\n";
 161 }