isl_input.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  * Copyright 2010      INRIA Saclay
   4  *
   5  * Use of this software is governed by the GNU LGPLv2.1 license
   6  *
   7  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   8  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   9  * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
  10  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
  11  */
  12
  13 #include <ctype.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <strings.h>
  17 #include <isl_set.h>
  18 #include <isl_seq.h>
  19 #include "isl_stream.h"
  20 #include "isl_map_private.h"
  21
  22 struct variable {
  23         char                    *name;
  24         int                      pos;
  25         struct variable         *next;
  26 };
  27
  28 struct vars {
  29         struct isl_ctx  *ctx;
  30         int              n;
  31         struct variable *v;
  32 };
  33
  34 static struct vars *vars_new(struct isl_ctx *ctx)
  35 {
  36         struct vars *v;
  37         v = isl_alloc_type(ctx, struct vars);
  38         if (!v)
  39                 return NULL;
  40         v->ctx = ctx;
  41         v->n = 0;
  42         v->v = NULL;
  43         return v;
  44 }
  45
  46 static void variable_free(struct variable *var)
  47 {
  48         while (var) {
  49                 struct variable *next = var->next;
  50                 free(var->name);
  51                 free(var);
  52                 var = next;
  53         }
  54 }
  55
  56 static void vars_free(struct vars *v)
  57 {
  58         if (!v)
  59                 return;
  60         variable_free(v->v);
  61         free(v);
  62 }
  63
  64 static struct variable *variable_new(struct vars *v, const char *name, int len,
  65                                 int pos)
  66 {
  67         struct variable *var;
  68         var = isl_alloc_type(v->ctx, struct variable);
  69         if (!var)
  70                 goto error;
  71         var->name = strdup(name);
  72         var->name[len] = '\0';
  73         var->pos = pos;
  74         var->next = v->v;
  75         return var;
  76 error:
  77         variable_free(v->v);
  78         return NULL;
  79 }
  80
  81 static int vars_pos(struct vars *v, const char *s, int len)
  82 {
  83         int pos;
  84         struct variable *q;
  85
  86         if (len == -1)
  87                 len = strlen(s);
  88         for (q = v->v; q; q = q->next) {
  89                 if (strncmp(q->name, s, len) == 0 && q->name[len] == '\0')
  90                         break;
  91         }
  92         if (q)
  93                 pos = q->pos;
  94         else {
  95                 pos = v->n;
  96                 v->v = variable_new(v, s, len, v->n);
  97                 if (!v->v)
  98                         return -1;
  99                 v->n++;
 100         }
 101         return pos;
 102 }
 103
 104 static struct vars *read_var_list(struct isl_stream *s, struct vars *v)
 105 {
 106         struct isl_token *tok;
 107
 108         while ((tok = isl_stream_next_token(s)) != NULL) {
 109                 int p;
 110                 int n = v->n;
 111
 112                 if (tok->type != ISL_TOKEN_IDENT)
 113                         break;
 114
 115                 p = vars_pos(v, tok->u.s, -1);
 116                 if (p < 0)
 117                         goto error;
 118                 if (p < n) {
 119                         isl_stream_error(s, tok, "expecting unique identifier");
 120                         goto error;
 121                 }
 122                 isl_token_free(tok);
 123                 tok = isl_stream_next_token(s);
 124                 if (!tok || tok->type != ',')
 125                         break;
 126
 127                 isl_token_free(tok);
 128         }
 129         if (tok)
 130                 isl_stream_push_token(s, tok);
 131
 132         return v;
 133 error:
 134         isl_token_free(tok);
 135         vars_free(v);
 136         return NULL;
 137 }
 138
 139 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v)
 140 {
 141         struct isl_token *tok = NULL;
 142         struct isl_vec *aff;
 143         int sign = 1;
 144
 145         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 146         isl_seq_clr(aff->el, aff->size);
 147         if (!aff)
 148                 return NULL;
 149
 150         for (;;) {
 151                 tok = isl_stream_next_token(s);
 152                 if (!tok) {
 153                         isl_stream_error(s, NULL, "unexpected EOF");
 154                         goto error;
 155                 }
 156                 if (tok->type == ISL_TOKEN_IDENT) {
 157                         int n = v->n;
 158                         int pos = vars_pos(v, tok->u.s, -1);
 159                         if (pos < 0)
 160                                 goto error;
 161                         if (pos >= n) {
 162                                 isl_stream_error(s, tok, "unknown identifier");
 163                                 goto error;
 164                         }
 165                         if (sign > 0)
 166                                 isl_int_add_ui(aff->el[1 + pos],
 167                                                aff->el[1 + pos], 1);
 168                         else
 169                                 isl_int_sub_ui(aff->el[1 + pos],
 170                                                aff->el[1 + pos], 1);
 171                         sign = 1;
 172                 } else if (tok->type == ISL_TOKEN_VALUE) {
 173                         struct isl_token *tok2;
 174                         int n = v->n;
 175                         int pos = -1;
 176                         tok2 = isl_stream_next_token(s);
 177                         if (tok2 && tok2->type == ISL_TOKEN_IDENT) {
 178                                 pos = vars_pos(v, tok2->u.s, -1);
 179                                 if (pos < 0)
 180                                         goto error;
 181                                 if (pos >= n) {
 182                                         isl_stream_error(s, tok2,
 183                                                 "unknown identifier");
 184                                         isl_token_free(tok2);
 185                                         goto error;
 186                                 }
 187                                 isl_token_free(tok2);
 188                         } else if (tok2)
 189                                 isl_stream_push_token(s, tok2);
 190                         if (sign < 0)
 191                                 isl_int_neg(tok->u.v, tok->u.v);
 192                         isl_int_add(aff->el[1 + pos],
 193                                         aff->el[1 + pos], tok->u.v);
 194                         sign = 1;
 195                 } else if (tok->type == '-') {
 196                         sign = -sign;
 197                 } else if (tok->type == '+') {
 198                         /* nothing */
 199                 } else {
 200                         isl_stream_push_token(s, tok);
 201                         break;
 202                 }
 203                 isl_token_free(tok);
 204         }
 205
 206         return aff;
 207 error:
 208         isl_vec_free(aff);
 209         return NULL;
 210 }
 211
 212 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 213         struct vars *v, struct isl_basic_map *bmap, int k)
 214 {
 215         struct isl_token *tok;
 216         int seen_paren = 0;
 217         struct isl_vec *aff;
 218
 219         if (isl_stream_eat(s, '['))
 220                 goto error;
 221
 222         tok = isl_stream_next_token(s);
 223         if (!tok)
 224                 goto error;
 225         if (tok->type == '(') {
 226                 seen_paren = 1;
 227                 isl_token_free(tok);
 228         } else
 229                 isl_stream_push_token(s, tok);
 230
 231         aff = accept_affine(s, v);
 232         if (!aff)
 233                 goto error;
 234
 235         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 236
 237         isl_vec_free(aff);
 238
 239         if (seen_paren && isl_stream_eat(s, ')'))
 240                 goto error;
 241         if (isl_stream_eat(s, '/'))
 242                 goto error;
 243
 244         tok = isl_stream_next_token(s);
 245         if (!tok)
 246                 goto error;
 247         if (tok->type != ISL_TOKEN_VALUE) {
 248                 isl_stream_error(s, tok, "expected denominator");
 249                 isl_stream_push_token(s, tok);
 250                 goto error;
 251         }
 252         isl_int_set(bmap->div[k][0], tok->u.v);
 253         isl_token_free(tok);
 254
 255         if (isl_stream_eat(s, ']'))
 256                 goto error;
 257
 258         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 259                 goto error;
 260
 261         return bmap;
 262 error:
 263         isl_basic_map_free(bmap);
 264         return NULL;
 265 }
 266
 267 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 268         struct vars *v, struct isl_basic_map *bmap)
 269 {
 270         struct isl_token *tok;
 271
 272         while ((tok = isl_stream_next_token(s)) != NULL) {
 273                 int k;
 274                 int p;
 275                 int n = v->n;
 276                 unsigned total = isl_basic_map_total_dim(bmap);
 277
 278                 if (tok->type != ISL_TOKEN_IDENT)
 279                         break;
 280
 281                 p = vars_pos(v, tok->u.s, -1);
 282                 if (p < 0)
 283                         goto error;
 284                 if (p < n) {
 285                         isl_stream_error(s, tok, "expecting unique identifier");
 286                         goto error;
 287                 }
 288                 isl_token_free(tok);
 289
 290                 bmap = isl_basic_map_cow(bmap);
 291                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 292                                                 1, 0, 2);
 293
 294                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 295                         goto error;
 296                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 297
 298                 tok = isl_stream_next_token(s);
 299                 if (tok && tok->type == '=') {
 300                         isl_token_free(tok);
 301                         bmap = add_div_definition(s, v, bmap, k);
 302                         tok = isl_stream_next_token(s);
 303                 }
 304
 305                 if (!tok || tok->type != ',')
 306                         break;
 307
 308                 isl_token_free(tok);
 309         }
 310         if (tok)
 311                 isl_stream_push_token(s, tok);
 312
 313         return bmap;
 314 error:
 315         isl_token_free(tok);
 316         isl_basic_map_free(bmap);
 317         return NULL;
 318 }
 319
 320 static struct vars *read_tuple(struct isl_stream *s, struct vars *v)
 321 {
 322         struct isl_token *tok;
 323
 324         tok = isl_stream_next_token(s);
 325         if (!tok || tok->type != '[') {
 326                 isl_stream_error(s, tok, "expecting '['");
 327                 goto error;
 328         }
 329         isl_token_free(tok);
 330         v = read_var_list(s, v);
 331         tok = isl_stream_next_token(s);
 332         if (!tok || tok->type != ']') {
 333                 isl_stream_error(s, tok, "expecting ']'");
 334                 goto error;
 335         }
 336         isl_token_free(tok);
 337
 338         return v;
 339 error:
 340         if (tok)
 341                 isl_token_free(tok);
 342         vars_free(v);
 343         return NULL;
 344 }
 345
 346 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 347         struct vars **v, struct isl_basic_map *bmap);
 348
 349 static struct isl_basic_map *add_exists(struct isl_stream *s,
 350         struct vars **v, struct isl_basic_map *bmap)
 351 {
 352         struct isl_token *tok;
 353         int n = (*v)->n;
 354         int extra;
 355         int seen_paren = 0;
 356         int i;
 357         unsigned total;
 358
 359         tok = isl_stream_next_token(s);
 360         if (!tok)
 361                 goto error;
 362         if (tok->type == '(') {
 363                 seen_paren = 1;
 364                 isl_token_free(tok);
 365         } else
 366                 isl_stream_push_token(s, tok);
 367
 368         bmap = read_defined_var_list(s, *v, bmap);
 369         if (!bmap)
 370                 goto error;
 371
 372         if (isl_stream_eat(s, ':'))
 373                 goto error;
 374         bmap = add_constraints(s, v, bmap);
 375         if (seen_paren && isl_stream_eat(s, ')'))
 376                 goto error;
 377         return bmap;
 378 error:
 379         isl_basic_map_free(bmap);
 380         return NULL;
 381 }
 382
 383 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 384         struct vars **v, struct isl_basic_map *bmap)
 385 {
 386         unsigned total = isl_basic_map_total_dim(bmap);
 387         int k;
 388         struct isl_token *tok = NULL;
 389         struct isl_vec *aff1 = NULL, *aff2 = NULL;
 390
 391         tok = isl_stream_next_token(s);
 392         if (!tok)
 393                 goto error;
 394         if (tok->type == ISL_TOKEN_EXISTS) {
 395                 isl_token_free(tok);
 396                 return add_exists(s, v, bmap);
 397         }
 398         isl_stream_push_token(s, tok);
 399         tok = NULL;
 400
 401         bmap = isl_basic_map_cow(bmap);
 402         bmap = isl_basic_map_extend_constraints(bmap, 0, 1);
 403         k = isl_basic_map_alloc_inequality(bmap);
 404         if (k < 0)
 405                 goto error;
 406
 407         aff1 = accept_affine(s, *v);
 408         if (!aff1)
 409                 goto error;
 410         tok = isl_stream_next_token(s);
 411         switch (tok->type) {
 412         case ISL_TOKEN_LT:
 413         case ISL_TOKEN_GT:
 414         case ISL_TOKEN_LE:
 415         case ISL_TOKEN_GE:
 416         case '=':
 417                 break;
 418         default:
 419                 isl_stream_error(s, tok, "missing operator");
 420                 isl_stream_push_token(s, tok);
 421                 tok = NULL;
 422                 goto error;
 423         }
 424         aff2 = accept_affine(s, *v);
 425         if (!aff2)
 426                 goto error;
 427         isl_assert(aff1->ctx, aff1->size == 1 + total, goto error);
 428         isl_assert(aff2->ctx, aff2->size == 1 + total, goto error);
 429
 430         if (tok->type == ISL_TOKEN_LE)
 431                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->negone, aff1->el,
 432                                                (*v)->ctx->one, aff2->el,
 433                                                aff1->size);
 434         else if (tok->type == ISL_TOKEN_GE)
 435                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 436                                                (*v)->ctx->negone, aff2->el,
 437                                                aff1->size);
 438         else if (tok->type == ISL_TOKEN_LT) {
 439                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->negone, aff1->el,
 440                                                (*v)->ctx->one, aff2->el,
 441                                                aff1->size);
 442                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 443         } else if (tok->type == ISL_TOKEN_GT) {
 444                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 445                                                (*v)->ctx->negone, aff2->el,
 446                                                aff1->size);
 447                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 448         } else {
 449                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 450                                                (*v)->ctx->negone, aff2->el,
 451                                                aff1->size);
 452                 isl_basic_map_inequality_to_equality(bmap, k);
 453         }
 454         isl_token_free(tok);
 455         isl_vec_free(aff1);
 456         isl_vec_free(aff2);
 457
 458         return bmap;
 459 error:
 460         if (tok)
 461                 isl_token_free(tok);
 462         isl_vec_free(aff1);
 463         isl_vec_free(aff2);
 464         isl_basic_map_free(bmap);
 465         return NULL;
 466 }
 467
 468 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 469         struct vars **v, struct isl_basic_map *bmap)
 470 {
 471         struct isl_token *tok;
 472
 473         for (;;) {
 474                 bmap = add_constraint(s, v, bmap);
 475                 if (!bmap)
 476                         return NULL;
 477                 tok = isl_stream_next_token(s);
 478                 if (!tok) {
 479                         isl_stream_error(s, NULL, "unexpected EOF");
 480                         goto error;
 481                 }
 482                 if (tok->type != ISL_TOKEN_AND)
 483                         break;
 484                 isl_token_free(tok);
 485         }
 486         isl_stream_push_token(s, tok);
 487
 488         return bmap;
 489 error:
 490         if (tok)
 491                 isl_token_free(tok);
 492         isl_basic_map_free(bmap);
 493         return NULL;
 494 }
 495
 496 static struct isl_basic_map *read_disjunct(struct isl_stream *s,
 497         struct vars **v, __isl_take isl_dim *dim)
 498 {
 499         struct isl_basic_map *bmap;
 500
 501         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 502         if (!bmap)
 503                 return NULL;
 504
 505         bmap = add_constraints(s, v, bmap);
 506         bmap = isl_basic_map_simplify(bmap);
 507         bmap = isl_basic_map_finalize(bmap);
 508         return bmap;
 509 }
 510
 511 static struct isl_map *read_disjuncts(struct isl_stream *s,
 512         struct vars **v, __isl_take isl_dim *dim)
 513 {
 514         struct isl_token *tok;
 515         struct isl_map *map;
 516
 517         tok = isl_stream_next_token(s);
 518         if (!tok) {
 519                 isl_stream_error(s, NULL, "unexpected EOF");
 520                 goto error;
 521         }
 522         if (tok->type == '}') {
 523                 isl_stream_push_token(s, tok);
 524                 return isl_map_universe(dim);
 525         }
 526         isl_stream_push_token(s, tok);
 527
 528         map = isl_map_empty(isl_dim_copy(dim));
 529         for (;;) {
 530                 struct isl_basic_map *bmap;
 531
 532                 bmap = read_disjunct(s, v, isl_dim_copy(dim));
 533                 map = isl_map_union(map, isl_map_from_basic_map(bmap));
 534
 535                 tok = isl_stream_next_token(s);
 536                 if (!tok || tok->type != ISL_TOKEN_OR)
 537                         break;
 538                 isl_token_free(tok);
 539         }
 540         if (tok)
 541                 isl_stream_push_token(s, tok);
 542
 543         isl_dim_free(dim);
 544         return map;
 545 error:
 546         isl_dim_free(dim);
 547         return NULL;
 548 }
 549
 550 static int polylib_pos_to_isl_pos(__isl_keep isl_basic_map *bmap, int pos)
 551 {
 552         if (pos < isl_basic_map_dim(bmap, isl_dim_out))
 553                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 554                            isl_basic_map_dim(bmap, isl_dim_in) + pos;
 555         pos -= isl_basic_map_dim(bmap, isl_dim_out);
 556
 557         if (pos < isl_basic_map_dim(bmap, isl_dim_in))
 558                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) + pos;
 559         pos -= isl_basic_map_dim(bmap, isl_dim_in);
 560
 561         if (pos < isl_basic_map_dim(bmap, isl_dim_div))
 562                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 563                            isl_basic_map_dim(bmap, isl_dim_in) +
 564                            isl_basic_map_dim(bmap, isl_dim_out) + pos;
 565         pos -= isl_basic_map_dim(bmap, isl_dim_div);
 566
 567         if (pos < isl_basic_map_dim(bmap, isl_dim_param))
 568                 return 1 + pos;
 569
 570         return 0;
 571 }
 572
 573 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 574         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 575 {
 576         int j;
 577         struct isl_token *tok;
 578         int type;
 579         int k;
 580         isl_int *c;
 581         unsigned nparam;
 582         unsigned dim;
 583
 584         if (!bmap)
 585                 return NULL;
 586
 587         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 588         dim = isl_basic_map_dim(bmap, isl_dim_out);
 589
 590         tok = isl_stream_next_token(s);
 591         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 592                 isl_stream_error(s, tok, "expecting coefficient");
 593                 if (tok)
 594                         isl_stream_push_token(s, tok);
 595                 goto error;
 596         }
 597         if (!tok->on_new_line) {
 598                 isl_stream_error(s, tok, "coefficient should appear on new line");
 599                 isl_stream_push_token(s, tok);
 600                 goto error;
 601         }
 602
 603         type = isl_int_get_si(tok->u.v);
 604         isl_token_free(tok);
 605
 606         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 607         if (type == 0) {
 608                 k = isl_basic_map_alloc_equality(bmap);
 609                 c = bmap->eq[k];
 610         } else {
 611                 k = isl_basic_map_alloc_inequality(bmap);
 612                 c = bmap->ineq[k];
 613         }
 614         if (k < 0)
 615                 goto error;
 616
 617         for (j = 0; j < 1 + isl_basic_map_total_dim(bmap); ++j) {
 618                 int pos;
 619                 tok = isl_stream_next_token(s);
 620                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 621                         isl_stream_error(s, tok, "expecting coefficient");
 622                         if (tok)
 623                                 isl_stream_push_token(s, tok);
 624                         goto error;
 625                 }
 626                 pos = polylib_pos_to_isl_pos(bmap, j);
 627                 isl_int_set(c[pos], tok->u.v);
 628                 isl_token_free(tok);
 629         }
 630
 631         return bmap;
 632 error:
 633         isl_basic_map_free(bmap);
 634         return NULL;
 635 }
 636
 637 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
 638         int nparam)
 639 {
 640         int i;
 641         struct isl_token *tok;
 642         struct isl_token *tok2;
 643         int n_row, n_col;
 644         int on_new_line;
 645         unsigned dim;
 646         struct isl_basic_map *bmap = NULL;
 647
 648         if (nparam < 0)
 649                 nparam = 0;
 650
 651         tok = isl_stream_next_token(s);
 652         if (!tok) {
 653                 isl_stream_error(s, NULL, "unexpected EOF");
 654                 return NULL;
 655         }
 656         tok2 = isl_stream_next_token(s);
 657         if (!tok2) {
 658                 isl_token_free(tok);
 659                 isl_stream_error(s, NULL, "unexpected EOF");
 660                 return NULL;
 661         }
 662         n_row = isl_int_get_si(tok->u.v);
 663         n_col = isl_int_get_si(tok2->u.v);
 664         on_new_line = tok2->on_new_line;
 665         isl_token_free(tok2);
 666         isl_token_free(tok);
 667         isl_assert(s->ctx, !on_new_line, return NULL);
 668         isl_assert(s->ctx, n_row >= 0, return NULL);
 669         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
 670         dim = n_col - 2 - nparam;
 671         bmap = isl_basic_map_alloc(s->ctx, nparam, 0, dim, 0, n_row, n_row);
 672         if (!bmap)
 673                 return NULL;
 674
 675         for (i = 0; i < n_row; ++i)
 676                 bmap = basic_map_read_polylib_constraint(s, bmap);
 677
 678         bmap = isl_basic_map_simplify(bmap);
 679         bmap = isl_basic_map_finalize(bmap);
 680         return bmap;
 681 }
 682
 683 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
 684 {
 685         struct isl_token *tok;
 686         struct isl_token *tok2;
 687         int i, n;
 688         struct isl_map *map;
 689
 690         tok = isl_stream_next_token(s);
 691         if (!tok) {
 692                 isl_stream_error(s, NULL, "unexpected EOF");
 693                 return NULL;
 694         }
 695         tok2 = isl_stream_next_token(s);
 696         if (!tok2) {
 697                 isl_token_free(tok);
 698                 isl_stream_error(s, NULL, "unexpected EOF");
 699                 return NULL;
 700         }
 701         if (!tok2->on_new_line) {
 702                 isl_stream_push_token(s, tok2);
 703                 isl_stream_push_token(s, tok);
 704                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 705         }
 706         isl_stream_push_token(s, tok2);
 707         n = isl_int_get_si(tok->u.v);
 708         isl_token_free(tok);
 709
 710         isl_assert(s->ctx, n >= 1, return NULL);
 711
 712         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 713
 714         for (i = 1; i < n; ++i)
 715                 map = isl_map_union(map,
 716                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
 717
 718         return map;
 719 }
 720
 721 static struct isl_dim *set_names(struct isl_dim *dim, struct vars *vars,
 722         enum isl_dim_type type, int offset, int n)
 723 {
 724         int i;
 725         struct variable *v;
 726
 727         for (i = 0, v = vars->v; i < offset; ++i, v = v->next)
 728                 ;
 729         for (i = n - 1; i >= 0; --i, v = v->next)
 730                 dim = isl_dim_set_name(dim, type, i, v->name);
 731
 732         return dim;
 733 }
 734
 735 static struct isl_dim *dim_from_vars(struct vars *vars,
 736         int nparam, int n_in, int n_out)
 737 {
 738         struct isl_dim *dim;
 739
 740         dim = isl_dim_alloc(vars->ctx, nparam, n_in, n_out);
 741         dim = set_names(dim, vars, isl_dim_param, n_out + n_in, nparam);
 742         dim = set_names(dim, vars, isl_dim_in, n_out, n_in);
 743         dim = set_names(dim, vars, isl_dim_out, 0, n_out);
 744
 745         return dim;
 746 }
 747
 748 static struct isl_map *map_read(struct isl_stream *s, int nparam)
 749 {
 750         struct isl_dim *dim = NULL;
 751         struct isl_map *map = NULL;
 752         struct isl_token *tok;
 753         struct vars *v = NULL;
 754         int n1;
 755         int n2;
 756
 757         tok = isl_stream_next_token(s);
 758         if (!tok) {
 759                 isl_stream_error(s, NULL, "unexpected EOF");
 760                 goto error;
 761         }
 762         if (tok->type == ISL_TOKEN_VALUE) {
 763                 isl_stream_push_token(s, tok);
 764                 return map_read_polylib(s, nparam);
 765         }
 766         v = vars_new(s->ctx);
 767         if (tok->type == '[') {
 768                 isl_stream_push_token(s, tok);
 769                 v = read_tuple(s, v);
 770                 if (!v)
 771                         return NULL;
 772                 if (nparam >= 0)
 773                         isl_assert(s->ctx, nparam == v->n, goto error);
 774                 nparam = v->n;
 775                 tok = isl_stream_next_token(s);
 776                 if (!tok || tok->type != ISL_TOKEN_TO) {
 777                         isl_stream_error(s, tok, "expecting '->'");
 778                         if (tok)
 779                                 isl_stream_push_token(s, tok);
 780                         goto error;
 781                 }
 782                 isl_token_free(tok);
 783                 tok = isl_stream_next_token(s);
 784         }
 785         if (nparam < 0)
 786                 nparam = 0;
 787         if (!tok || tok->type != '{') {
 788                 isl_stream_error(s, tok, "expecting '{'");
 789                 if (tok)
 790                         isl_stream_push_token(s, tok);
 791                 goto error;
 792         }
 793         isl_token_free(tok);
 794         v = read_tuple(s, v);
 795         if (!v)
 796                 return NULL;
 797         n1 = v->n - nparam;
 798         tok = isl_stream_next_token(s);
 799         if (tok && tok->type == ISL_TOKEN_TO) {
 800                 isl_token_free(tok);
 801                 v = read_tuple(s, v);
 802                 if (!v)
 803                         return NULL;
 804                 n2 = v->n - n1 - nparam;
 805         } else {
 806                 if (tok)
 807                         isl_stream_push_token(s, tok);
 808                 n2 = n1;
 809                 n1 = 0;
 810         }
 811         dim = dim_from_vars(v, nparam, n1, n2);
 812         tok = isl_stream_next_token(s);
 813         if (!tok) {
 814                 isl_stream_error(s, NULL, "unexpected EOF");
 815                 goto error;
 816         }
 817         if (tok->type == ':') {
 818                 isl_token_free(tok);
 819                 map = read_disjuncts(s, &v, isl_dim_copy(dim));
 820                 tok = isl_stream_next_token(s);
 821         } else
 822                 map = isl_map_universe(isl_dim_copy(dim));
 823         if (tok && tok->type == '}') {
 824                 isl_token_free(tok);
 825         } else {
 826                 isl_stream_error(s, tok, "unexpected isl_token");
 827                 if (tok)
 828                         isl_token_free(tok);
 829                 goto error;
 830         }
 831         vars_free(v);
 832         isl_dim_free(dim);
 833
 834         return map;
 835 error:
 836         isl_dim_free(dim);
 837         isl_map_free(map);
 838         if (v)
 839                 vars_free(v);
 840         return NULL;
 841 }
 842
 843 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
 844 {
 845         struct isl_map *map;
 846         struct isl_basic_map *bmap;
 847
 848         map = map_read(s, nparam);
 849         if (!map)
 850                 return NULL;
 851
 852         isl_assert(map->ctx, map->n <= 1, goto error);
 853
 854         if (map->n == 0)
 855                 bmap = isl_basic_map_empty_like_map(map);
 856         else
 857                 bmap = isl_basic_map_copy(map->p[0]);
 858
 859         isl_map_free(map);
 860
 861         return bmap;
 862 error:
 863         isl_map_free(map);
 864         return NULL;
 865 }
 866
 867 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
 868                 FILE *input, int nparam)
 869 {
 870         struct isl_basic_map *bmap;
 871         struct isl_stream *s = isl_stream_new_file(ctx, input);
 872         if (!s)
 873                 return NULL;
 874         bmap = basic_map_read(s, nparam);
 875         isl_stream_free(s);
 876         return bmap;
 877 }
 878
 879 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
 880                 FILE *input, int nparam)
 881 {
 882         struct isl_basic_map *bmap;
 883         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
 884         if (!bmap)
 885                 return NULL;
 886         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 887         return (struct isl_basic_set *)bmap;
 888 error:
 889         isl_basic_map_free(bmap);
 890         return NULL;
 891 }
 892
 893 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
 894                 const char *str, int nparam)
 895 {
 896         struct isl_basic_map *bmap;
 897         struct isl_stream *s = isl_stream_new_str(ctx, str);
 898         if (!s)
 899                 return NULL;
 900         bmap = basic_map_read(s, nparam);
 901         isl_stream_free(s);
 902         return bmap;
 903 }
 904
 905 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
 906                 const char *str, int nparam)
 907 {
 908         struct isl_basic_map *bmap;
 909         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
 910         if (!bmap)
 911                 return NULL;
 912         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 913         return (struct isl_basic_set *)bmap;
 914 error:
 915         isl_basic_map_free(bmap);
 916         return NULL;
 917 }
 918
 919 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
 920                 FILE *input, int nparam)
 921 {
 922         struct isl_map *map;
 923         struct isl_stream *s = isl_stream_new_file(ctx, input);
 924         if (!s)
 925                 return NULL;
 926         map = map_read(s, nparam);
 927         isl_stream_free(s);
 928         return map;
 929 }
 930
 931 __isl_give isl_map *isl_map_read_from_str(struct isl_ctx *ctx,
 932                 const char *str, int nparam)
 933 {
 934         struct isl_map *map;
 935         struct isl_stream *s = isl_stream_new_str(ctx, str);
 936         if (!s)
 937                 return NULL;
 938         map = map_read(s, nparam);
 939         isl_stream_free(s);
 940         return map;
 941 }
 942
 943 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
 944                 FILE *input, int nparam)
 945 {
 946         struct isl_map *map;
 947         map = isl_map_read_from_file(ctx, input, nparam);
 948         if (!map)
 949                 return NULL;
 950         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
 951         return (struct isl_set *)map;
 952 error:
 953         isl_map_free(map);
 954         return NULL;
 955 }
 956
 957 struct isl_set *isl_set_read_from_str(struct isl_ctx *ctx,
 958                 const char *str, int nparam)
 959 {
 960         struct isl_map *map;
 961         map = isl_map_read_from_str(ctx, str, nparam);
 962         if (!map)
 963                 return NULL;
 964         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
 965         return (struct isl_set *)map;
 966 error:
 967         isl_map_free(map);
 968         return NULL;
 969 }
 970
 971 static char *next_line(FILE *input, char *line, unsigned len)
 972 {
 973         char *p;
 974
 975         do {
 976                 if (!(p = fgets(line, len, input)))
 977                         return NULL;
 978                 while (isspace(*p) && *p != '\n')
 979                         ++p;
 980         } while (*p == '#' || *p == '\n');
 981
 982         return p;
 983 }
 984
 985 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
 986                 FILE *input)
 987 {
 988         struct isl_vec *vec = NULL;
 989         char line[1024];
 990         char val[1024];
 991         char *p;
 992         unsigned size;
 993         int j;
 994         int n;
 995         int offset;
 996
 997         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
 998         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
 999
1000         vec = isl_vec_alloc(ctx, size);
1001
1002         p = next_line(input, line, sizeof(line));
1003         isl_assert(ctx, p, goto error);
1004
1005         for (j = 0; j < size; ++j) {
1006                 n = sscanf(p, "%s%n", val, &offset);
1007                 isl_assert(ctx, n != 0, goto error);
1008                 isl_int_read(vec->el[j], val);
1009                 p += offset;
1010         }
1011
1012         return vec;
1013 error:
1014         isl_vec_free(vec);
1015         return NULL;
1016 }
1017
1018 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
1019                 FILE *input, unsigned input_format)
1020 {
1021         if (input_format == ISL_FORMAT_POLYLIB)
1022                 return isl_vec_read_from_file_polylib(ctx, input);
1023         else
1024                 isl_assert(ctx, 0, return NULL);
1025 }