opcodes/i386-gen.c

   1 /* Copyright 2007  Free Software Foundation, Inc.
   2
   3    This file is part of GAS, the GNU Assembler, and GDB, the GNU Debugger.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include "getopt.h"
  24 #include "libiberty.h"
  25 #include "safe-ctype.h"
  26
  27 #include "i386-opc.h"
  28
  29 #include <libintl.h>
  30 #define _(String) gettext (String)
  31
  32 static const char *program_name = NULL;
  33 static int debug = 0;
  34
  35 static void
  36 fail (const char *message, ...)
  37 {
  38   va_list args;
  39
  40   va_start (args, message);
  41   fprintf (stderr, _("%s: Error: "), program_name);
  42   vfprintf (stderr, message, args);
  43   va_end (args);
  44   xexit (1);
  45 }
  46
  47 /* Remove leading white spaces.  */
  48
  49 static char *
  50 remove_leading_whitespaces (char *str)
  51 {
  52   while (ISSPACE (*str))
  53     str++;
  54   return str;
  55 }
  56
  57 /* Remove trailing white spaces.  */
  58
  59 static void
  60 remove_trailing_whitespaces (char *str)
  61 {
  62   size_t last = strlen (str);
  63
  64   if (last == 0)
  65     return;
  66
  67   do
  68     {
  69       last--;
  70       if (ISSPACE (str [last]))
  71         str[last] = '\0';
  72       else
  73         break;
  74     }
  75   while (last != 0);
  76 }
  77
  78 /* Find next field separated by '.' and terminate it. Return a
  79    pointer to the one after it.  */
  80
  81 static char *
  82 next_field (char *str, char **next)
  83 {
  84   char *p;
  85
  86   p = remove_leading_whitespaces (str);
  87   for (str = p; *str != ',' && *str != '\0'; str++);
  88
  89   *str = '\0';
  90   remove_trailing_whitespaces (p);
  91
  92   *next = str + 1;
  93
  94   return p;
  95 }
  96
  97 static void
  98 process_i386_opcodes (void)
  99 {
 100   FILE *fp = fopen ("i386-opc.tbl", "r");
 101   char buf[2048];
 102   unsigned int i;
 103   char *str, *p, *last;
 104   char *name, *operands, *base_opcode, *extension_opcode;
 105   char *cpu_flags, *opcode_modifier, *operand_types [MAX_OPERANDS];
 106
 107   if (fp == NULL)
 108     fail (_("can't find i386-opc.tbl for reading\n"));
 109
 110   printf ("\n/* i386 opcode table.  */\n\n");
 111   printf ("const template i386_optab[] =\n{\n");
 112
 113   while (!feof (fp))
 114     {
 115       if (fgets (buf, sizeof (buf), fp) == NULL)
 116         break;
 117
 118       p = remove_leading_whitespaces (buf);
 119
 120       /* Skip comments.  */
 121       str = strstr (p, "//");
 122       if (str != NULL)
 123         str[0] = '\0';
 124
 125       /* Remove trailing white spaces.  */
 126       remove_trailing_whitespaces (p);
 127
 128       switch (p[0])
 129         {
 130         case '#':
 131           printf ("%s\n", p);
 132         case '\0':
 133           continue;
 134           break;
 135         default:
 136           break;
 137         }
 138
 139       last = p + strlen (p);
 140
 141       /* Find name.  */
 142       name = next_field (p, &str);
 143
 144       if (str >= last)
 145         abort ();
 146
 147       /* Find number of operands.  */
 148       operands = next_field (str, &str);
 149
 150       if (str >= last)
 151         abort ();
 152
 153       /* Find base_opcode.  */
 154       base_opcode = next_field (str, &str);
 155
 156       if (str >= last)
 157         abort ();
 158
 159       /* Find extension_opcode.  */
 160       extension_opcode = next_field (str, &str);
 161
 162       if (str >= last)
 163         abort ();
 164
 165       /* Find cpu_flags.  */
 166       cpu_flags = next_field (str, &str);
 167
 168       if (str >= last)
 169         abort ();
 170
 171       /* Find opcode_modifier.  */
 172       opcode_modifier = next_field (str, &str);
 173
 174       if (str >= last)
 175         abort ();
 176
 177       /* Remove the first {.  */
 178       str = remove_leading_whitespaces (str);
 179       if (*str != '{')
 180         abort ();
 181       str = remove_leading_whitespaces (str + 1);
 182
 183       i = strlen (str);
 184
 185       /* There are at least "X}".  */
 186       if (i < 2)
 187         abort ();
 188
 189       /* Remove trailing white spaces and }. */
 190       do
 191         {
 192           i--;
 193           if (ISSPACE (str[i]) || str[i] == '}')
 194             str[i] = '\0';
 195           else
 196             break;
 197         }
 198       while (i != 0);
 199
 200       last = str + i;
 201
 202       /* Find operand_types.  */
 203       for (i = 0; i < ARRAY_SIZE (operand_types); i++)
 204         {
 205           if (str >= last)
 206             {
 207               operand_types [i] = NULL;
 208               break;
 209             }
 210
 211           operand_types [i] = next_field (str, &str);
 212           if (*operand_types[i] == '0')
 213             {
 214               if (i != 0)
 215                 operand_types[i] = NULL;
 216               break;
 217             }
 218         }
 219
 220       printf ("  { \"%s\", %s, %s, %s, %s,\n",
 221               name, operands, base_opcode, extension_opcode,
 222               cpu_flags);
 223
 224       printf ("    %s,\n", opcode_modifier);
 225
 226       printf ("    { ");
 227
 228       for (i = 0; i < ARRAY_SIZE (operand_types); i++)
 229         {
 230           if (operand_types[i] == NULL
 231               || *operand_types[i] == '0')
 232             {
 233               if (i == 0)
 234                 printf ("0");
 235               break;
 236             }
 237
 238           if (i != 0)
 239             printf (",\n      ");
 240
 241           printf ("%s", operand_types[i]);
 242         }
 243       printf (" } },\n");
 244     }
 245
 246   printf ("  { NULL, 0, 0, 0, 0, 0, { 0 } }\n");
 247   printf ("};\n");
 248 }
 249
 250 static void
 251 process_i386_registers (void)
 252 {
 253   FILE *fp = fopen ("i386-reg.tbl", "r");
 254   char buf[2048];
 255   char *str, *p, *last;
 256   char *reg_name, *reg_type, *reg_flags, *reg_num;
 257
 258   if (fp == NULL)
 259     fail (_("can't find i386-reg.tbl for reading\n"));
 260
 261   printf ("\n/* i386 register table.  */\n\n");
 262   printf ("const reg_entry i386_regtab[] =\n{\n");
 263
 264   while (!feof (fp))
 265     {
 266       if (fgets (buf, sizeof (buf), fp) == NULL)
 267         break;
 268
 269       p = remove_leading_whitespaces (buf);
 270
 271       /* Skip comments.  */
 272       str = strstr (p, "//");
 273       if (str != NULL)
 274         str[0] = '\0';
 275
 276       /* Remove trailing white spaces.  */
 277       remove_trailing_whitespaces (p);
 278
 279       switch (p[0])
 280         {
 281         case '#':
 282           printf ("%s\n", p);
 283         case '\0':
 284           continue;
 285           break;
 286         default:
 287           break;
 288         }
 289
 290       last = p + strlen (p);
 291
 292       /* Find reg_name.  */
 293       reg_name = next_field (p, &str);
 294
 295       if (str >= last)
 296         abort ();
 297
 298       /* Find reg_type.  */
 299       reg_type = next_field (str, &str);
 300
 301       if (str >= last)
 302         abort ();
 303
 304       /* Find reg_flags.  */
 305       reg_flags = next_field (str, &str);
 306
 307       if (str >= last)
 308         abort ();
 309
 310       /* Find reg_num.  */
 311       reg_num = next_field (str, &str);
 312
 313       printf ("  { \"%s\", %s, %s, %s },\n",
 314               reg_name, reg_type, reg_flags, reg_num);
 315     }
 316
 317   printf ("};\n");
 318
 319   printf ("\nconst unsigned int i386_regtab_size = ARRAY_SIZE (i386_regtab);\n");
 320 }
 321
 322 /* Program options.  */
 323 #define OPTION_SRCDIR   200
 324
 325 struct option long_options[] =
 326 {
 327   {"srcdir",  required_argument, NULL, OPTION_SRCDIR},
 328   {"debug",   no_argument,       NULL, 'd'},
 329   {"version", no_argument,       NULL, 'V'},
 330   {"help",    no_argument,       NULL, 'h'},
 331   {0,         no_argument,       NULL, 0}
 332 };
 333
 334 static void
 335 print_version (void)
 336 {
 337   printf ("%s: version 1.0\n", program_name);
 338   xexit (0);
 339 }
 340
 341 static void
 342 usage (FILE * stream, int status)
 343 {
 344   fprintf (stream, "Usage: %s [-V | --version] [-d | --debug] [--srcdir=dirname] [--help]\n",
 345            program_name);
 346   xexit (status);
 347 }
 348
 349 int
 350 main (int argc, char **argv)
 351 {
 352   extern int chdir (char *);
 353   char *srcdir = NULL;
 354   int c;
 355
 356   program_name = *argv;
 357   xmalloc_set_program_name (program_name);
 358
 359   while ((c = getopt_long (argc, argv, "vVdh", long_options, 0)) != EOF)
 360     switch (c)
 361       {
 362       case OPTION_SRCDIR:
 363         srcdir = optarg;
 364         break;
 365       case 'V':
 366       case 'v':
 367         print_version ();
 368         break;
 369       case 'd':
 370         debug = 1;
 371         break;
 372       case 'h':
 373       case '?':
 374         usage (stderr, 0);
 375       default:
 376       case 0:
 377         break;
 378       }
 379
 380   if (optind != argc)
 381     usage (stdout, 1);
 382
 383   if (srcdir != NULL)
 384     if (chdir (srcdir) != 0)
 385       fail (_("unable to change directory to \"%s\", errno = %s\n"),
 386             srcdir, strerror (errno));
 387
 388   printf ("/* This file is automatically generated by i386-gen.  Do not edit!  */\n");
 389
 390   process_i386_opcodes ();
 391   process_i386_registers ();
 392
 393   exit (0);
 394 }