macros.pl

   1 #!/usr/bin/perl
   2 #
   3 # macros.pl   produce macros.c from standard.mac
   4 #
   5 # The Netwide Assembler is copyright (C) 1996 Simon Tatham and
   6 # Julian Hall. All rights reserved. The software is
   7 # redistributable under the license given in the file "LICENSE"
   8 # distributed in the NASM archive.
   9
  10 require 'phash.ph';
  11 require 'pptok.ph';
  12
  13 my $fname;
  14 my $line = 0;
  15 my $index      = 0;
  16 my $tasm_count = 0;
  17
  18 #
  19 # Generate macros.c
  20 #
  21 open(OUT,">macros.c") or die "unable to open macros.c\n";
  22
  23 print OUT "/*\n";
  24 print OUT " * Do not edit - this file auto-generated by macros.pl from:\n";
  25 print OUT " * ", join(' ', @ARGV), "\n";
  26 print OUT " */\n";
  27 print OUT "\n";
  28 print OUT "#include \"tables.h\"\n";
  29 print OUT "#include \"nasmlib.h\"\n";
  30 print OUT "#include \"hashtbl.h\"\n";
  31 print OUT "\n";
  32 print OUT "const char * const nasm_stdmac[] = {";
  33
  34 my $npkg = 0;
  35 my @pkg_list   = ();
  36 my %pkg_number = ();
  37 my %pkg_index  = ();
  38 my $pkg;
  39
  40 foreach $fname ( @ARGV ) {
  41     open(INPUT,$fname) or die "unable to open $fname\n";
  42     print OUT "\n    /* From $fname */\n";
  43     while (<INPUT>) {
  44         $line++;
  45         chomp;
  46         if (m/^\s*\*END\*TASM\*MACROS\*\s*$/) {
  47             $tasm_count = $index;
  48             print OUT "    /* End of TASM macros */\n";
  49         } elsif (m/^USE:\s*(\S+)\s*$/) {
  50             $pkg = $1;
  51             if (defined($pkg_number{$pkg})) {
  52                 die "$0: $fname: duplicate package: $pkg\n";
  53             }
  54             printf OUT "        /* %4d */ NULL,\n", $index++;
  55             print OUT "    /* %use $pkg */\n";
  56             push(@pkg_list, $pkg);
  57             $pkg_number{$pkg} = $npkg++;
  58             $pkg_index{$pkg}  = $index;
  59         } elsif (m/^\s*((\s*([^\"\';\s]+|\"[^\"]*\"|\'[^\']*\'))*)\s*(;.*)?$/) {
  60             my $s1, $s2, $pd, $ws;
  61             $s1 = $1;
  62             $s1 =~ s/(\s)\s+/$1/g;
  63             $s1 =~ s/\\/\\\\/g;
  64             $s1 =~ s/"/\\"/g;
  65             $s2 = '';
  66             while ($s1 =~ /(\%[a-zA-Z_][a-zA-Z0-9_]*)((\s+)(.*)|)$/) {
  67                 $s2 .= "$'";
  68                 $pd = $1;
  69                 $ws = $3;
  70                 $s1 = $4;
  71                 if (defined($pptok_hash{$pd}) &&
  72                     $pptok_hash{$pd} <= 127) {
  73                     $s2 .= sprintf("\\x%02x\"\"", $pptok_hash{$pd}+128);
  74                 } else {
  75                     $s2 .= $pd.$ws;
  76                 }
  77             }
  78             $s2 .= $s1;
  79             if (length($s2) > 0) {
  80                 printf OUT "        /* %4d */ \"%s\",\n", $index++, $s2;
  81             }
  82         } else {
  83             die "$fname:$line:  error unterminated quote";
  84         }
  85     }
  86     close(INPUT);
  87 }
  88 printf OUT "        /* %4d */ NULL\n};\n\n", $index++;
  89 print OUT "const char * const * const nasm_stdmac_after_tasm = ",
  90     "&nasm_stdmac[$tasm_count];\n\n";
  91
  92 my @hashinfo = gen_perfect_hash(\%pkg_number);
  93 if (!@hashinfo) {
  94     die "$0: no hash found\n";
  95 }
  96 # Paranoia...
  97 verify_hash_table(\%pkg_number, \@hashinfo);
  98 my ($n, $sv, $g) = @hashinfo;
  99 die if ($n & ($n-1));
 100
 101 print OUT "const char * const *nasm_stdmac_find_package(const char *package)\n";
 102 print OUT "{\n";
 103 print OUT "    static const struct {\n";
 104 print OUT "         const char *package;\n";
 105 print OUT "         const char * const *macros;\n";
 106 print OUT "    } packages[$npkg] = {\n";
 107 foreach $pkg (@pkg_list) {
 108     printf OUT "        { \"%s\", nasm_stdmac+%d },\n",
 109         $pkg, $pkg_index{$pkg};
 110 }
 111 print OUT "    };\n";
 112
 113 # Put a large value in unused slots.  This makes it extremely unlikely
 114 # that any combination that involves unused slot will pass the range test.
 115 # This speeds up rejection of unrecognized tokens, i.e. identifiers.
 116 print OUT "#define UNUSED 16383\n";
 117
 118 print OUT "    static const int16_t hash1[$n] = {\n";
 119 for ($i = 0; $i < $n; $i++) {
 120     my $h = ${$g}[$i*2+0];
 121     print OUT "        ", defined($h) ? $h : 'UNUSED', ",\n";
 122 }
 123 print OUT "    };\n";
 124
 125 print OUT "    static const int16_t hash2[$n] = {\n";
 126 for ($i = 0; $i < $n; $i++) {
 127     my $h = ${$g}[$i*2+1];
 128     print OUT "        ", defined($h) ? $h : 'UNUSED', ",\n";
 129 }
 130 print OUT "    };\n";
 131
 132 print OUT  "    uint32_t k1, k2;\n";
 133 print OUT  "    uint64_t crc;\n";
 134 # For correct overflow behavior, "ix" should be unsigned of the same
 135 # width as the hash arrays.
 136 print OUT  "    uint16_t ix;\n";
 137 print OUT  "\n";
 138
 139 printf OUT "    crc = crc64i(UINT64_C(0x%08x%08x), package);\n",
 140     $$sv[0], $$sv[1];
 141 print  OUT "    k1 = (uint32_t)crc;\n";
 142 print  OUT "    k2 = (uint32_t)(crc >> 32);\n";
 143 print  OUT "\n";
 144 printf OUT "    ix = hash1[k1 & 0x%x] + hash2[k2 & 0x%x];\n", $n-1, $n-1;
 145 printf OUT "    if (ix >= %d)\n", scalar(@pkg_list);
 146 print OUT  "        return NULL;\n";
 147 print OUT  "\n";
 148 print OUT  "    if (nasm_stricmp(packages[ix].package, package))\n";
 149 print OUT  "        return NULL;\n";
 150 print OUT  "\n";
 151 print OUT  "    return packages[ix].macros;\n";
 152 print OUT  "}\n";
 153
 154 close(OUT);