isl_stream.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <ctype.h>
  11 #include <string.h>
  12 #include <strings.h>
  13 #include <isl/ctx.h>
  14 #include <isl_stream_private.h>
  15 #include <isl/map.h>
  16 #include <isl/aff.h>
  17
  18 struct isl_keyword {
  19         char                    *name;
  20         enum isl_token_type     type;
  21 };
  22
  23 static int same_name(const void *entry, const void *val)
  24 {
  25         const struct isl_keyword *keyword = (const struct isl_keyword *)entry;
  26
  27         return !strcmp(keyword->name, val);
  28 }
  29
  30 enum isl_token_type isl_stream_register_keyword(struct isl_stream *s,
  31         const char *name)
  32 {
  33         struct isl_hash_table_entry *entry;
  34         struct isl_keyword *keyword;
  35         uint32_t name_hash;
  36
  37         if (!s->keywords) {
  38                 s->keywords = isl_hash_table_alloc(s->ctx, 10);
  39                 if (!s->keywords)
  40                         return ISL_TOKEN_ERROR;
  41                 s->next_type = ISL_TOKEN_LAST;
  42         }
  43
  44         name_hash = isl_hash_string(isl_hash_init(), name);
  45
  46         entry = isl_hash_table_find(s->ctx, s->keywords, name_hash,
  47                                         same_name, name, 1);
  48         if (!entry)
  49                 return ISL_TOKEN_ERROR;
  50         if (entry->data) {
  51                 keyword = entry->data;
  52                 return keyword->type;
  53         }
  54
  55         keyword = isl_calloc_type(s->ctx, struct isl_keyword);
  56         if (!keyword)
  57                 return ISL_TOKEN_ERROR;
  58         keyword->type = s->next_type++;
  59         keyword->name = strdup(name);
  60         if (!keyword->name) {
  61                 free(keyword);
  62                 return ISL_TOKEN_ERROR;
  63         }
  64         entry->data = keyword;
  65
  66         return keyword->type;
  67 }
  68
  69 struct isl_token *isl_token_new(isl_ctx *ctx,
  70         int line, int col, unsigned on_new_line)
  71 {
  72         struct isl_token *tok = isl_alloc_type(ctx, struct isl_token);
  73         if (!tok)
  74                 return NULL;
  75         tok->line = line;
  76         tok->col = col;
  77         tok->on_new_line = on_new_line;
  78         tok->is_keyword = 0;
  79         tok->u.s = NULL;
  80         return tok;
  81 }
  82
  83 void isl_token_free(struct isl_token *tok)
  84 {
  85         if (!tok)
  86                 return;
  87         if (tok->type == ISL_TOKEN_VALUE)
  88                 isl_int_clear(tok->u.v);
  89         else if (tok->type == ISL_TOKEN_MAP)
  90                 isl_map_free(tok->u.map);
  91         else if (tok->type == ISL_TOKEN_AFF)
  92                 isl_pw_aff_free(tok->u.pwaff);
  93         else
  94                 free(tok->u.s);
  95         free(tok);
  96 }
  97
  98 void isl_stream_error(struct isl_stream *s, struct isl_token *tok, char *msg)
  99 {
 100         int line = tok ? tok->line : s->line;
 101         int col = tok ? tok->col : s->col;
 102         fprintf(stderr, "syntax error (%d, %d): %s\n", line, col, msg);
 103         if (tok) {
 104                 if (tok->type < 256)
 105                         fprintf(stderr, "got '%c'\n", tok->type);
 106                 else if (tok->type == ISL_TOKEN_IDENT)
 107                         fprintf(stderr, "got ident '%s'\n", tok->u.s);
 108                 else if (tok->is_keyword)
 109                         fprintf(stderr, "got keyword '%s'\n", tok->u.s);
 110                 else if (tok->type == ISL_TOKEN_VALUE) {
 111                         fprintf(stderr, "got value '");
 112                         isl_int_print(stderr, tok->u.v, 0);
 113                         fprintf(stderr, "'\n");
 114                 } else if (tok->type == ISL_TOKEN_MAP) {
 115                         isl_printer *p;
 116                         fprintf(stderr, "got map '");
 117                         p = isl_printer_to_file(s->ctx, stderr);
 118                         p = isl_printer_print_map(p, tok->u.map);
 119                         isl_printer_free(p);
 120                         fprintf(stderr, "'\n");
 121                 } else if (tok->type == ISL_TOKEN_AFF) {
 122                         isl_printer *p;
 123                         fprintf(stderr, "got affine expression '");
 124                         p = isl_printer_to_file(s->ctx, stderr);
 125                         p = isl_printer_print_pw_aff(p, tok->u.pwaff);
 126                         isl_printer_free(p);
 127                         fprintf(stderr, "'\n");
 128                 } else if (tok->u.s)
 129                         fprintf(stderr, "got token '%s'\n", tok->u.s);
 130                 else
 131                         fprintf(stderr, "got token type %d\n", tok->type);
 132         }
 133 }
 134
 135 static struct isl_stream* isl_stream_new(struct isl_ctx *ctx)
 136 {
 137         int i;
 138         struct isl_stream *s = isl_alloc_type(ctx, struct isl_stream);
 139         if (!s)
 140                 return NULL;
 141         s->ctx = ctx;
 142         isl_ctx_ref(s->ctx);
 143         s->file = NULL;
 144         s->str = NULL;
 145         s->len = 0;
 146         s->line = 1;
 147         s->col = 0;
 148         s->eof = 0;
 149         s->c = -1;
 150         s->n_un = 0;
 151         for (i = 0; i < 5; ++i)
 152                 s->tokens[i] = NULL;
 153         s->n_token = 0;
 154         s->keywords = NULL;
 155         s->size = 256;
 156         s->buffer = isl_alloc_array(ctx, char, s->size);
 157         if (!s->buffer)
 158                 goto error;
 159         return s;
 160 error:
 161         isl_stream_free(s);
 162         return NULL;
 163 }
 164
 165 struct isl_stream* isl_stream_new_file(struct isl_ctx *ctx, FILE *file)
 166 {
 167         struct isl_stream *s = isl_stream_new(ctx);
 168         if (!s)
 169                 return NULL;
 170         s->file = file;
 171         return s;
 172 }
 173
 174 struct isl_stream* isl_stream_new_str(struct isl_ctx *ctx, const char *str)
 175 {
 176         struct isl_stream *s = isl_stream_new(ctx);
 177         if (!s)
 178                 return NULL;
 179         s->str = str;
 180         return s;
 181 }
 182
 183 static int stream_getc(struct isl_stream *s)
 184 {
 185         int c;
 186         if (s->eof)
 187                 return -1;
 188         if (s->n_un)
 189                 return s->c = s->un[--s->n_un];
 190         if (s->file)
 191                 c = fgetc(s->file);
 192         else {
 193                 c = *s->str++;
 194                 if (c == '\0')
 195                         c = -1;
 196         }
 197         if (c == -1)
 198                 s->eof = 1;
 199         if (!s->eof) {
 200                 if (s->c == '\n') {
 201                         s->line++;
 202                         s->col = 0;
 203                 } else
 204                         s->col++;
 205         }
 206         s->c = c;
 207         return c;
 208 }
 209
 210 static void isl_stream_ungetc(struct isl_stream *s, int c)
 211 {
 212         isl_assert(s->ctx, s->n_un < 5, return);
 213         s->un[s->n_un++] = c;
 214         s->c = -1;
 215 }
 216
 217 static int isl_stream_getc(struct isl_stream *s)
 218 {
 219         int c;
 220
 221         do {
 222                 c = stream_getc(s);
 223                 if (c != '\\')
 224                         return c;
 225                 c = stream_getc(s);
 226         } while (c == '\n');
 227
 228         isl_stream_ungetc(s, c);
 229
 230         return '\\';
 231 }
 232
 233 static int isl_stream_push_char(struct isl_stream *s, int c)
 234 {
 235         if (s->len >= s->size) {
 236                 char *buffer;
 237                 s->size = (3*s->size)/2;
 238                 buffer = isl_realloc_array(s->ctx, s->buffer, char, s->size);
 239                 if (!buffer)
 240                         return -1;
 241                 s->buffer = buffer;
 242         }
 243         s->buffer[s->len++] = c;
 244         return 0;
 245 }
 246
 247 void isl_stream_push_token(struct isl_stream *s, struct isl_token *tok)
 248 {
 249         isl_assert(s->ctx, s->n_token < 5, return);
 250         s->tokens[s->n_token++] = tok;
 251 }
 252
 253 static enum isl_token_type check_keywords(struct isl_stream *s)
 254 {
 255         struct isl_hash_table_entry *entry;
 256         struct isl_keyword *keyword;
 257         uint32_t name_hash;
 258
 259         if (!strcasecmp(s->buffer, "exists"))
 260                 return ISL_TOKEN_EXISTS;
 261         if (!strcasecmp(s->buffer, "and"))
 262                 return ISL_TOKEN_AND;
 263         if (!strcasecmp(s->buffer, "or"))
 264                 return ISL_TOKEN_OR;
 265         if (!strcasecmp(s->buffer, "not"))
 266                 return ISL_TOKEN_NOT;
 267         if (!strcasecmp(s->buffer, "infty"))
 268                 return ISL_TOKEN_INFTY;
 269         if (!strcasecmp(s->buffer, "infinity"))
 270                 return ISL_TOKEN_INFTY;
 271         if (!strcasecmp(s->buffer, "NaN"))
 272                 return ISL_TOKEN_NAN;
 273         if (!strcasecmp(s->buffer, "min"))
 274                 return ISL_TOKEN_MIN;
 275         if (!strcasecmp(s->buffer, "max"))
 276                 return ISL_TOKEN_MAX;
 277         if (!strcasecmp(s->buffer, "rat"))
 278                 return ISL_TOKEN_RAT;
 279         if (!strcasecmp(s->buffer, "true"))
 280                 return ISL_TOKEN_TRUE;
 281         if (!strcasecmp(s->buffer, "false"))
 282                 return ISL_TOKEN_FALSE;
 283         if (!strcasecmp(s->buffer, "ceild"))
 284                 return ISL_TOKEN_CEILD;
 285         if (!strcasecmp(s->buffer, "floord"))
 286                 return ISL_TOKEN_FLOORD;
 287         if (!strcasecmp(s->buffer, "mod"))
 288                 return ISL_TOKEN_MOD;
 289
 290         if (!s->keywords)
 291                 return ISL_TOKEN_IDENT;
 292
 293         name_hash = isl_hash_string(isl_hash_init(), s->buffer);
 294         entry = isl_hash_table_find(s->ctx, s->keywords, name_hash, same_name,
 295                                         s->buffer, 0);
 296         if (entry) {
 297                 keyword = entry->data;
 298                 return keyword->type;
 299         }
 300
 301         return ISL_TOKEN_IDENT;
 302 }
 303
 304 int isl_stream_skip_line(struct isl_stream *s)
 305 {
 306         int c;
 307
 308         while ((c = isl_stream_getc(s)) != -1 && c != '\n')
 309                 /* nothing */
 310                 ;
 311
 312         return c == -1 ? -1 : 0;
 313 }
 314
 315 static struct isl_token *next_token(struct isl_stream *s, int same_line)
 316 {
 317         int c;
 318         struct isl_token *tok = NULL;
 319         int line, col;
 320         int old_line = s->line;
 321
 322         if (s->n_token) {
 323                 if (same_line && s->tokens[s->n_token - 1]->on_new_line)
 324                         return NULL;
 325                 return s->tokens[--s->n_token];
 326         }
 327
 328         if (same_line && s->c == '\n')
 329                 return NULL;
 330
 331         s->len = 0;
 332
 333         /* skip spaces and comment lines */
 334         while ((c = isl_stream_getc(s)) != -1) {
 335                 if (c == '#') {
 336                         if (isl_stream_skip_line(s) < 0)
 337                                 break;
 338                         c = '\n';
 339                         if (same_line)
 340                                 break;
 341                 } else if (!isspace(c) || (same_line && c == '\n'))
 342                         break;
 343         }
 344
 345         line = s->line;
 346         col = s->col;
 347
 348         if (c == -1 || (same_line && c == '\n'))
 349                 return NULL;
 350         if (c == '(' ||
 351             c == ')' ||
 352             c == '+' ||
 353             c == '*' ||
 354             c == '%' ||
 355             c == '?' ||
 356             c == '^' ||
 357             c == '=' ||
 358             c == '@' ||
 359             c == '$' ||
 360             c == ',' ||
 361             c == '.' ||
 362             c == ';' ||
 363             c == '[' ||
 364             c == ']' ||
 365             c == '{' ||
 366             c == '}') {
 367                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 368                 if (!tok)
 369                         return NULL;
 370                 tok->type = (enum isl_token_type)c;
 371                 return tok;
 372         }
 373         if (c == '-') {
 374                 int c;
 375                 if ((c = isl_stream_getc(s)) == '>') {
 376                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 377                         if (!tok)
 378                                 return NULL;
 379                         tok->u.s = strdup("->");
 380                         tok->type = ISL_TOKEN_TO;
 381                         return tok;
 382                 }
 383                 if (c != -1)
 384                         isl_stream_ungetc(s, c);
 385                 if (!isdigit(c)) {
 386                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 387                         if (!tok)
 388                                 return NULL;
 389                         tok->type = (enum isl_token_type) '-';
 390                         return tok;
 391                 }
 392         }
 393         if (c == '-' || isdigit(c)) {
 394                 int minus = c == '-';
 395                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 396                 if (!tok)
 397                         return NULL;
 398                 tok->type = ISL_TOKEN_VALUE;
 399                 isl_int_init(tok->u.v);
 400                 if (isl_stream_push_char(s, c))
 401                         goto error;
 402                 while ((c = isl_stream_getc(s)) != -1 && isdigit(c))
 403                         if (isl_stream_push_char(s, c))
 404                                 goto error;
 405                 if (c != -1)
 406                         isl_stream_ungetc(s, c);
 407                 isl_stream_push_char(s, '\0');
 408                 isl_int_read(tok->u.v, s->buffer);
 409                 if (minus && isl_int_is_zero(tok->u.v)) {
 410                         tok->col++;
 411                         tok->on_new_line = 0;
 412                         isl_stream_push_token(s, tok);
 413                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 414                         if (!tok)
 415                                 return NULL;
 416                         tok->type = (enum isl_token_type) '-';
 417                 }
 418                 return tok;
 419         }
 420         if (isalpha(c) || c == '_') {
 421                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 422                 if (!tok)
 423                         return NULL;
 424                 isl_stream_push_char(s, c);
 425                 while ((c = isl_stream_getc(s)) != -1 &&
 426                                 (isalnum(c) || c == '_'))
 427                         isl_stream_push_char(s, c);
 428                 if (c != -1)
 429                         isl_stream_ungetc(s, c);
 430                 while ((c = isl_stream_getc(s)) != -1 && c == '\'')
 431                         isl_stream_push_char(s, c);
 432                 if (c != -1)
 433                         isl_stream_ungetc(s, c);
 434                 isl_stream_push_char(s, '\0');
 435                 tok->type = check_keywords(s);
 436                 if (tok->type != ISL_TOKEN_IDENT)
 437                         tok->is_keyword = 1;
 438                 tok->u.s = strdup(s->buffer);
 439                 if (!tok->u.s)
 440                         goto error;
 441                 return tok;
 442         }
 443         if (c == '"') {
 444                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 445                 if (!tok)
 446                         return NULL;
 447                 tok->type = ISL_TOKEN_STRING;
 448                 tok->u.s = NULL;
 449                 while ((c = isl_stream_getc(s)) != -1 && c != '"' && c != '\n')
 450                         isl_stream_push_char(s, c);
 451                 if (c != '"') {
 452                         isl_stream_error(s, NULL, "unterminated string");
 453                         goto error;
 454                 }
 455                 isl_stream_push_char(s, '\0');
 456                 tok->u.s = strdup(s->buffer);
 457                 return tok;
 458         }
 459         if (c == ':') {
 460                 int c;
 461                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 462                 if (!tok)
 463                         return NULL;
 464                 if ((c = isl_stream_getc(s)) == '=') {
 465                         tok->u.s = strdup(":=");
 466                         tok->type = ISL_TOKEN_DEF;
 467                         return tok;
 468                 }
 469                 if (c != -1)
 470                         isl_stream_ungetc(s, c);
 471                 tok->type = (enum isl_token_type) ':';
 472                 return tok;
 473         }
 474         if (c == '>') {
 475                 int c;
 476                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 477                 if (!tok)
 478                         return NULL;
 479                 if ((c = isl_stream_getc(s)) == '=') {
 480                         tok->u.s = strdup(">=");
 481                         tok->type = ISL_TOKEN_GE;
 482                         return tok;
 483                 } else if (c == '>') {
 484                         if ((c = isl_stream_getc(s)) == '=') {
 485                                 tok->u.s = strdup(">>=");
 486                                 tok->type = ISL_TOKEN_LEX_GE;
 487                                 return tok;
 488                         }
 489                         tok->u.s = strdup(">>");
 490                         tok->type = ISL_TOKEN_LEX_GT;
 491                 } else {
 492                         tok->u.s = strdup(">");
 493                         tok->type = ISL_TOKEN_GT;
 494                 }
 495                 if (c != -1)
 496                         isl_stream_ungetc(s, c);
 497                 return tok;
 498         }
 499         if (c == '<') {
 500                 int c;
 501                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 502                 if (!tok)
 503                         return NULL;
 504                 if ((c = isl_stream_getc(s)) == '=') {
 505                         tok->u.s = strdup("<=");
 506                         tok->type = ISL_TOKEN_LE;
 507                         return tok;
 508                 } else if (c == '<') {
 509                         if ((c = isl_stream_getc(s)) == '=') {
 510                                 tok->u.s = strdup("<<=");
 511                                 tok->type = ISL_TOKEN_LEX_LE;
 512                                 return tok;
 513                         }
 514                         tok->u.s = strdup("<<");
 515                         tok->type = ISL_TOKEN_LEX_LT;
 516                 } else {
 517                         tok->u.s = strdup("<");
 518                         tok->type = ISL_TOKEN_LT;
 519                 }
 520                 if (c != -1)
 521                         isl_stream_ungetc(s, c);
 522                 return tok;
 523         }
 524         if (c == '&') {
 525                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 526                 if (!tok)
 527                         return NULL;
 528                 tok->type = ISL_TOKEN_AND;
 529                 if ((c = isl_stream_getc(s)) != '&' && c != -1) {
 530                         tok->u.s = strdup("&");
 531                         isl_stream_ungetc(s, c);
 532                 } else
 533                         tok->u.s = strdup("&&");
 534                 return tok;
 535         }
 536         if (c == '|') {
 537                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 538                 if (!tok)
 539                         return NULL;
 540                 tok->type = ISL_TOKEN_OR;
 541                 if ((c = isl_stream_getc(s)) != '|' && c != -1) {
 542                         tok->u.s = strdup("|");
 543                         isl_stream_ungetc(s, c);
 544                 } else
 545                         tok->u.s = strdup("||");
 546                 return tok;
 547         }
 548         if (c == '/') {
 549                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 550                 if (!tok)
 551                         return NULL;
 552                 if ((c = isl_stream_getc(s)) != '\\' && c != -1) {
 553                         tok->type = (enum isl_token_type) '/';
 554                         isl_stream_ungetc(s, c);
 555                 } else {
 556                         tok->u.s = strdup("/\\");
 557                         tok->type = ISL_TOKEN_AND;
 558                 }
 559                 return tok;
 560         }
 561         if (c == '\\') {
 562                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 563                 if (!tok)
 564                         return NULL;
 565                 if ((c = isl_stream_getc(s)) != '/' && c != -1) {
 566                         tok->type = (enum isl_token_type) '\\';
 567                         isl_stream_ungetc(s, c);
 568                 } else {
 569                         tok->u.s = strdup("\\/");
 570                         tok->type = ISL_TOKEN_OR;
 571                 }
 572                 return tok;
 573         }
 574         if (c == '!') {
 575                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 576                 if (!tok)
 577                         return NULL;
 578                 if ((c = isl_stream_getc(s)) == '=') {
 579                         tok->u.s = strdup("!=");
 580                         tok->type = ISL_TOKEN_NE;
 581                         return tok;
 582                 } else {
 583                         tok->type = ISL_TOKEN_NOT;
 584                         tok->u.s = strdup("!");
 585                 }
 586                 if (c != -1)
 587                         isl_stream_ungetc(s, c);
 588                 return tok;
 589         }
 590
 591         tok = isl_token_new(s->ctx, line, col, old_line != line);
 592         if (!tok)
 593                 return NULL;
 594         tok->type = ISL_TOKEN_UNKNOWN;
 595         return tok;
 596 error:
 597         isl_token_free(tok);
 598         return NULL;
 599 }
 600
 601 struct isl_token *isl_stream_next_token(struct isl_stream *s)
 602 {
 603         return next_token(s, 0);
 604 }
 605
 606 struct isl_token *isl_stream_next_token_on_same_line(struct isl_stream *s)
 607 {
 608         return next_token(s, 1);
 609 }
 610
 611 int isl_stream_eat_if_available(struct isl_stream *s, int type)
 612 {
 613         struct isl_token *tok;
 614
 615         tok = isl_stream_next_token(s);
 616         if (!tok)
 617                 return 0;
 618         if (tok->type == type) {
 619                 isl_token_free(tok);
 620                 return 1;
 621         }
 622         isl_stream_push_token(s, tok);
 623         return 0;
 624 }
 625
 626 int isl_stream_next_token_is(struct isl_stream *s, int type)
 627 {
 628         struct isl_token *tok;
 629         int r;
 630
 631         tok = isl_stream_next_token(s);
 632         if (!tok)
 633                 return 0;
 634         r = tok->type == type;
 635         isl_stream_push_token(s, tok);
 636         return r;
 637 }
 638
 639 char *isl_stream_read_ident_if_available(struct isl_stream *s)
 640 {
 641         struct isl_token *tok;
 642
 643         tok = isl_stream_next_token(s);
 644         if (!tok)
 645                 return NULL;
 646         if (tok->type == ISL_TOKEN_IDENT) {
 647                 char *ident = strdup(tok->u.s);
 648                 isl_token_free(tok);
 649                 return ident;
 650         }
 651         isl_stream_push_token(s, tok);
 652         return NULL;
 653 }
 654
 655 int isl_stream_eat(struct isl_stream *s, int type)
 656 {
 657         struct isl_token *tok;
 658
 659         tok = isl_stream_next_token(s);
 660         if (!tok)
 661                 return -1;
 662         if (tok->type == type) {
 663                 isl_token_free(tok);
 664                 return 0;
 665         }
 666         isl_stream_error(s, tok, "expecting other token");
 667         isl_stream_push_token(s, tok);
 668         return -1;
 669 }
 670
 671 int isl_stream_is_empty(struct isl_stream *s)
 672 {
 673         struct isl_token *tok;
 674
 675         tok = isl_stream_next_token(s);
 676
 677         if (!tok)
 678                 return 1;
 679
 680         isl_stream_push_token(s, tok);
 681         return 0;
 682 }
 683
 684 static int free_keyword(void **p, void *user)
 685 {
 686         struct isl_keyword *keyword = *p;
 687
 688         free(keyword->name);
 689         free(keyword);
 690
 691         return 0;
 692 }
 693
 694 void isl_stream_flush_tokens(struct isl_stream *s)
 695 {
 696         int i;
 697
 698         if (!s)
 699                 return;
 700         for (i = 0; i < s->n_token; ++i)
 701                 isl_token_free(s->tokens[i]);
 702         s->n_token = 0;
 703 }
 704
 705 void isl_stream_free(struct isl_stream *s)
 706 {
 707         if (!s)
 708                 return;
 709         free(s->buffer);
 710         if (s->n_token != 0) {
 711                 struct isl_token *tok = isl_stream_next_token(s);
 712                 isl_stream_error(s, tok, "unexpected token");
 713                 isl_token_free(tok);
 714         }
 715         if (s->keywords) {
 716                 isl_hash_table_foreach(s->ctx, s->keywords, &free_keyword, NULL);
 717                 isl_hash_table_free(s->ctx, s->keywords);
 718         }
 719         isl_ctx_deref(s->ctx);
 720         free(s);
 721 }