sim/igen/table.c

   1 /* The IGEN simulator generator for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2023 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <ctype.h>
  29
  30 #include "misc.h"
  31 #include "lf.h"
  32 #include "table.h"
  33
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36
  37 typedef struct _open_table open_table;
  38 struct _open_table
  39 {
  40   size_t size;
  41   char *buffer;
  42   char *pos;
  43   line_ref pseudo_line;
  44   line_ref real_line;
  45   open_table *parent;
  46   table *root;
  47 };
  48 struct _table
  49 {
  50   open_table *current;
  51 };
  52
  53
  54 static line_ref *
  55 current_line (open_table * file)
  56 {
  57   line_ref *entry = ZALLOC (line_ref);
  58   *entry = file->pseudo_line;
  59   return entry;
  60 }
  61
  62 static table_entry *
  63 new_table_entry (open_table * file, table_entry_type type)
  64 {
  65   table_entry *entry;
  66   entry = ZALLOC (table_entry);
  67   entry->file = file->root;
  68   entry->line = current_line (file);
  69   entry->type = type;
  70   return entry;
  71 }
  72
  73 static void
  74 set_nr_table_entry_fields (table_entry *entry, int nr_fields)
  75 {
  76   entry->field = NZALLOC (char *, nr_fields + 1);
  77   entry->nr_fields = nr_fields;
  78 }
  79
  80
  81 void
  82 table_push (table *root,
  83             const line_ref *line,
  84             table_include *includes,
  85             const char *file_name)
  86 {
  87   FILE *ff;
  88   open_table *file;
  89   table_include dummy;
  90   table_include *include = &dummy;
  91
  92   /* dummy up a search of this directory */
  93   dummy.next = includes;
  94   dummy.dir = "";
  95
  96   /* create a file descriptor */
  97   file = ZALLOC (open_table);
  98   if (file == NULL)
  99     {
 100       perror (file_name);
 101       exit (1);
 102     }
 103   file->root = root;
 104   file->parent = root->current;
 105   root->current = file;
 106
 107   while (1)
 108     {
 109       /* save the file name */
 110       char *dup_name =
 111         NZALLOC (char, strlen (include->dir) + strlen (file_name) + 2);
 112       if (dup_name == NULL)
 113         {
 114           perror (file_name);
 115           exit (1);
 116         }
 117       if (include->dir[0] != '\0')
 118         {
 119           strcat (dup_name, include->dir);
 120           strcat (dup_name, "/");
 121         }
 122       strcat (dup_name, file_name);
 123       file->real_line.file_name = dup_name;
 124       file->pseudo_line.file_name = dup_name;
 125       /* open the file */
 126
 127       ff = fopen (dup_name, "rb");
 128       if (ff)
 129         break;
 130       /* free (dup_name); */
 131       if (include->next == NULL)
 132         {
 133           if (line != NULL)
 134             error (line, "Problem opening file `%s'\n", file_name);
 135           perror (file_name);
 136           exit (1);
 137         }
 138       include = include->next;
 139     }
 140
 141
 142   /* determine the size */
 143   fseek (ff, 0, SEEK_END);
 144   file->size = ftell (ff);
 145   fseek (ff, 0, SEEK_SET);
 146
 147   /* allocate this much memory */
 148   file->buffer = (char *) zalloc (file->size + 1);
 149   if (file->buffer == NULL)
 150     {
 151       perror (file_name);
 152       exit (1);
 153     }
 154   file->pos = file->buffer;
 155
 156   /* read it all in */
 157   if (fread (file->buffer, 1, file->size, ff) < file->size)
 158     {
 159       perror (file_name);
 160       exit (1);
 161     }
 162   file->buffer[file->size] = '\0';
 163
 164   /* set the initial line numbering */
 165   file->real_line.line_nr = 1;  /* specifies current line */
 166   file->pseudo_line.line_nr = 1;        /* specifies current line */
 167
 168   /* done */
 169   fclose (ff);
 170 }
 171
 172 table *
 173 table_open (const char *file_name)
 174 {
 175   table *root;
 176
 177   /* create a file descriptor */
 178   root = ZALLOC (table);
 179   if (root == NULL)
 180     {
 181       perror (file_name);
 182       exit (1);
 183     }
 184
 185   table_push (root, NULL, NULL, file_name);
 186   return root;
 187 }
 188
 189 char *
 190 skip_spaces (char *chp)
 191 {
 192   while (1)
 193     {
 194       if (*chp == '\0' || *chp == '\n' || !isspace (*chp))
 195         return chp;
 196       chp++;
 197     }
 198 }
 199
 200
 201 char *
 202 back_spaces (char *start, char *chp)
 203 {
 204   while (1)
 205     {
 206       if (chp <= start || !isspace (chp[-1]))
 207         return chp;
 208       chp--;
 209     }
 210 }
 211
 212 char *
 213 skip_digits (char *chp)
 214 {
 215   while (1)
 216     {
 217       if (*chp == '\0' || *chp == '\n' || !isdigit (*chp))
 218         return chp;
 219       chp++;
 220     }
 221 }
 222
 223 char *
 224 skip_to_separator (char *chp, char *separators)
 225 {
 226   while (1)
 227     {
 228       char *sep = separators;
 229       while (1)
 230         {
 231           if (*chp == *sep)
 232             return chp;
 233           if (*sep == '\0')
 234             break;
 235           sep++;
 236         }
 237       chp++;
 238     }
 239 }
 240
 241 static char *
 242 skip_to_null (char *chp)
 243 {
 244   return skip_to_separator (chp, "");
 245 }
 246
 247
 248 static char *
 249 skip_to_nl (char *chp)
 250 {
 251   return skip_to_separator (chp, "\n");
 252 }
 253
 254
 255 static void
 256 next_line (open_table * file)
 257 {
 258   file->pos = skip_to_nl (file->pos);
 259   if (*file->pos == '0')
 260     error (&file->pseudo_line, "Missing <nl> at end of line\n");
 261   *file->pos = '\0';
 262   file->pos += 1;
 263   file->real_line.line_nr += 1;
 264   file->pseudo_line.line_nr += 1;
 265 }
 266
 267
 268 extern table_entry *
 269 table_read (table *root)
 270 {
 271   open_table *file = root->current;
 272   table_entry *entry = NULL;
 273   while (1)
 274     {
 275
 276       /* end-of-file? */
 277       while (*file->pos == '\0')
 278         {
 279           if (file->parent != NULL)
 280             {
 281               file = file->parent;
 282               root->current = file;
 283             }
 284           else
 285             return NULL;
 286         }
 287
 288       /* code_block? */
 289       if (*file->pos == '{')
 290         {
 291           char *chp;
 292           next_line (file);     /* discard leading brace */
 293           entry = new_table_entry (file, table_code_entry);
 294           chp = file->pos;
 295           /* determine how many lines are involved - look for <nl> "}" */
 296           {
 297             int nr_lines = 0;
 298             while (*file->pos != '}')
 299               {
 300                 next_line (file);
 301                 nr_lines++;
 302               }
 303             set_nr_table_entry_fields (entry, nr_lines);
 304           }
 305           /* now enter each line */
 306           {
 307             int line_nr;
 308             for (line_nr = 0; line_nr < entry->nr_fields; line_nr++)
 309               {
 310                 if (strncmp (chp, "  ", 2) == 0)
 311                   entry->field[line_nr] = chp + 2;
 312                 else
 313                   entry->field[line_nr] = chp;
 314                 chp = skip_to_null (chp) + 1;
 315               }
 316             /* skip trailing brace */
 317             ASSERT (*file->pos == '}');
 318             next_line (file);
 319           }
 320           break;
 321         }
 322
 323       /* tab block? */
 324       if (*file->pos == '\t')
 325         {
 326           char *chp = file->pos;
 327           entry = new_table_entry (file, table_code_entry);
 328           /* determine how many lines are involved - look for <nl> !<tab> */
 329           {
 330             int nr_lines = 0;
 331             int nr_blank_lines = 0;
 332             while (1)
 333               {
 334                 if (*file->pos == '\t')
 335                   {
 336                     nr_lines = nr_lines + nr_blank_lines + 1;
 337                     nr_blank_lines = 0;
 338                     next_line (file);
 339                   }
 340                 else
 341                   {
 342                     file->pos = skip_spaces (file->pos);
 343                     if (*file->pos != '\n')
 344                       break;
 345                     nr_blank_lines++;
 346                     next_line (file);
 347                   }
 348               }
 349             set_nr_table_entry_fields (entry, nr_lines);
 350           }
 351           /* now enter each line */
 352           {
 353             int line_nr;
 354             for (line_nr = 0; line_nr < entry->nr_fields; line_nr++)
 355               {
 356                 if (*chp == '\t')
 357                   entry->field[line_nr] = chp + 1;
 358                 else
 359                   entry->field[line_nr] = "";   /* blank */
 360                 chp = skip_to_null (chp) + 1;
 361               }
 362           }
 363           break;
 364         }
 365
 366       /* cpp directive? */
 367       if (file->pos[0] == '#')
 368         {
 369           char *chp = skip_spaces (file->pos + 1);
 370
 371           /* cpp line-nr directive - # <line-nr> "<file>" */
 372           if (isdigit (*chp)
 373               && *skip_digits (chp) == ' '
 374               && *skip_spaces (skip_digits (chp)) == '"')
 375             {
 376               int line_nr;
 377               char *file_name;
 378               file->pos = chp;
 379               /* parse the number */
 380               line_nr = atoi (file->pos) - 1;
 381               /* skip to the file name */
 382               while (file->pos[0] != '0'
 383                      && file->pos[0] != '"' && file->pos[0] != '\0')
 384                 file->pos++;
 385               if (file->pos[0] != '"')
 386                 error (&file->real_line,
 387                        "Missing opening quote in cpp directive\n");
 388               /* parse the file name */
 389               file->pos++;
 390               file_name = file->pos;
 391               while (file->pos[0] != '"' && file->pos[0] != '\0')
 392                 file->pos++;
 393               if (file->pos[0] != '"')
 394                 error (&file->real_line,
 395                        "Missing closing quote in cpp directive\n");
 396               file->pos[0] = '\0';
 397               file->pos++;
 398               file->pos = skip_to_nl (file->pos);
 399               if (file->pos[0] != '\n')
 400                 error (&file->real_line,
 401                        "Missing newline in cpp directive\n");
 402               file->pseudo_line.file_name = file_name;
 403               file->pseudo_line.line_nr = line_nr;
 404               next_line (file);
 405               continue;
 406             }
 407
 408           /* #define and #undef - not implemented yet */
 409
 410           /* Old style # comment */
 411           next_line (file);
 412           continue;
 413         }
 414
 415       /* blank line or end-of-file? */
 416       file->pos = skip_spaces (file->pos);
 417       if (*file->pos == '\0')
 418         error (&file->pseudo_line, "Missing <nl> at end of file\n");
 419       if (*file->pos == '\n')
 420         {
 421           next_line (file);
 422           continue;
 423         }
 424
 425       /* comment - leading // or # - skip */
 426       if ((file->pos[0] == '/' && file->pos[1] == '/')
 427           || (file->pos[0] == '#'))
 428         {
 429           next_line (file);
 430           continue;
 431         }
 432
 433       /* colon field */
 434       {
 435         char *chp = file->pos;
 436         entry = new_table_entry (file, table_colon_entry);
 437         next_line (file);
 438         /* figure out how many fields */
 439         {
 440           int nr_fields = 1;
 441           char *tmpch = chp;
 442           while (1)
 443             {
 444               tmpch = skip_to_separator (tmpch, "\\:");
 445               if (*tmpch == '\\')
 446                 {
 447                   /* eat the escaped character */
 448                   char *cp = tmpch;
 449                   while (cp[1] != '\0')
 450                     {
 451                       cp[0] = cp[1];
 452                       cp++;
 453                     }
 454                   cp[0] = '\0';
 455                   tmpch++;
 456                 }
 457               else if (*tmpch != ':')
 458                 break;
 459               else
 460                 {
 461                   *tmpch = '\0';
 462                   tmpch++;
 463                   nr_fields++;
 464                 }
 465             }
 466           set_nr_table_entry_fields (entry, nr_fields);
 467         }
 468         /* now parse them */
 469         {
 470           int field_nr;
 471           for (field_nr = 0; field_nr < entry->nr_fields; field_nr++)
 472             {
 473               chp = skip_spaces (chp);
 474               entry->field[field_nr] = chp;
 475               chp = skip_to_null (chp);
 476               *back_spaces (entry->field[field_nr], chp) = '\0';
 477               chp++;
 478             }
 479         }
 480         break;
 481       }
 482
 483     }
 484
 485   ASSERT (entry == NULL || entry->field[entry->nr_fields] == NULL);
 486   return entry;
 487 }
 488
 489 extern void
 490 table_print_code (lf *file, const table_entry *entry)
 491 {
 492   int field_nr;
 493   int nr = 0;
 494   for (field_nr = 0; field_nr < entry->nr_fields; field_nr++)
 495     {
 496       char *chp = entry->field[field_nr];
 497       int in_bit_field = 0;
 498       if (*chp == '#')
 499         lf_indent_suppress (file);
 500       while (*chp != '\0')
 501         {
 502           if (chp[0] == '{' && !isspace (chp[1]) && chp[1] != '\0')
 503             {
 504               in_bit_field = 1;
 505               nr += lf_putchr (file, '_');
 506             }
 507           else if (in_bit_field && chp[0] == ':')
 508             {
 509               nr += lf_putchr (file, '_');
 510             }
 511           else if (in_bit_field && *chp == '}')
 512             {
 513               nr += lf_putchr (file, '_');
 514               in_bit_field = 0;
 515             }
 516           else
 517             {
 518               nr += lf_putchr (file, *chp);
 519             }
 520           chp++;
 521         }
 522       if (in_bit_field)
 523         {
 524           line_ref line = *entry->line;
 525           line.line_nr += field_nr;
 526           error (&line, "Bit field brace miss match\n");
 527         }
 528       nr += lf_putchr (file, '\n');
 529     }
 530 }
 531
 532
 533 void
 534 dump_line_ref (lf *file,
 535                const char *prefix,
 536                const line_ref *line,
 537                const char *suffix)
 538 {
 539   lf_printf (file, "%s(line_ref*) %p", prefix, line);
 540   if (line != NULL)
 541     {
 542       lf_indent (file, +1);
 543       lf_printf (file, "\n(line_nr %d)", line->line_nr);
 544       lf_printf (file, "\n(file_name %s)", line->file_name);
 545       lf_indent (file, -1);
 546     }
 547   lf_printf (file, "%s", suffix);
 548 }
 549
 550
 551 static const char *
 552 table_entry_type_to_str (table_entry_type type)
 553 {
 554   switch (type)
 555     {
 556     case table_code_entry:
 557       return "code-entry";
 558     case table_colon_entry:
 559       return "colon-entry";
 560     }
 561   return "*invalid*";
 562 }
 563
 564 void
 565 dump_table_entry (lf *file,
 566                   const char *prefix,
 567                   const table_entry *entry,
 568                   const char *suffix)
 569 {
 570   lf_printf (file, "%s(table_entry*) %p", prefix, entry);
 571   if (entry != NULL)
 572     {
 573       int field;
 574       lf_indent (file, +1);
 575       dump_line_ref (file, "\n(line ", entry->line, ")");
 576       lf_printf (file, "\n(type %s)", table_entry_type_to_str (entry->type));
 577       lf_printf (file, "\n(nr_fields %d)", entry->nr_fields);
 578       lf_printf (file, "\n(fields");
 579       lf_indent (file, +1);
 580       for (field = 0; field < entry->nr_fields; field++)
 581         lf_printf (file, "\n\"%s\"", entry->field[field]);
 582       lf_indent (file, -1);
 583       lf_printf (file, ")");
 584       lf_indent (file, -1);
 585     }
 586   lf_printf (file, "%s", suffix);
 587 }
 588
 589
 590 #ifdef MAIN
 591 int
 592 main (int argc, char **argv)
 593 {
 594   table *t;
 595   table_entry *entry;
 596   lf *l;
 597   int line_nr;
 598
 599   if (argc != 2)
 600     {
 601       printf ("Usage: table <file>\n");
 602       exit (1);
 603     }
 604
 605   t = table_open (argv[1]);
 606   l = lf_open ("-", "stdout", lf_omit_references, lf_is_text, "tmp-table");
 607
 608   line_nr = 0;
 609   do
 610     {
 611       char line[10];
 612       entry = table_read (t);
 613       line_nr++;
 614       sprintf (line, "(%d ", line_nr);
 615       dump_table_entry (l, line, entry, ")\n");
 616     }
 617   while (entry != NULL);
 618
 619   return 0;
 620 }
 621 #endif