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 __isl_give isl_mat *accept_affine_list(struct isl_stream *s,
 213         struct vars *v)
 214 {
 215         struct isl_vec *vec;
 216         struct isl_mat *mat;
 217         struct isl_token *tok = NULL;
 218
 219         vec = accept_affine(s, v);
 220         mat = isl_mat_from_row_vec(vec);
 221         if (!mat)
 222                 return NULL;
 223
 224         for (;;) {
 225                 tok = isl_stream_next_token(s);
 226                 if (!tok) {
 227                         isl_stream_error(s, NULL, "unexpected EOF");
 228                         goto error;
 229                 }
 230                 if (tok->type != ',') {
 231                         isl_stream_push_token(s, tok);
 232                         break;
 233                 }
 234                 isl_token_free(tok);
 235
 236                 vec = accept_affine(s, v);
 237                 mat = isl_mat_vec_concat(mat, vec);
 238                 if (!mat)
 239                         return NULL;
 240         }
 241
 242         return mat;
 243 error:
 244         isl_mat_free(mat);
 245         return NULL;
 246 }
 247
 248 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 249         struct vars *v, struct isl_basic_map *bmap, int k)
 250 {
 251         struct isl_token *tok;
 252         int seen_paren = 0;
 253         struct isl_vec *aff;
 254
 255         if (isl_stream_eat(s, '['))
 256                 goto error;
 257
 258         tok = isl_stream_next_token(s);
 259         if (!tok)
 260                 goto error;
 261         if (tok->type == '(') {
 262                 seen_paren = 1;
 263                 isl_token_free(tok);
 264         } else
 265                 isl_stream_push_token(s, tok);
 266
 267         aff = accept_affine(s, v);
 268         if (!aff)
 269                 goto error;
 270
 271         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 272
 273         isl_vec_free(aff);
 274
 275         if (seen_paren && isl_stream_eat(s, ')'))
 276                 goto error;
 277         if (isl_stream_eat(s, '/'))
 278                 goto error;
 279
 280         tok = isl_stream_next_token(s);
 281         if (!tok)
 282                 goto error;
 283         if (tok->type != ISL_TOKEN_VALUE) {
 284                 isl_stream_error(s, tok, "expected denominator");
 285                 isl_stream_push_token(s, tok);
 286                 goto error;
 287         }
 288         isl_int_set(bmap->div[k][0], tok->u.v);
 289         isl_token_free(tok);
 290
 291         if (isl_stream_eat(s, ']'))
 292                 goto error;
 293
 294         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 295                 goto error;
 296
 297         return bmap;
 298 error:
 299         isl_basic_map_free(bmap);
 300         return NULL;
 301 }
 302
 303 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 304         struct vars *v, struct isl_basic_map *bmap)
 305 {
 306         struct isl_token *tok;
 307
 308         while ((tok = isl_stream_next_token(s)) != NULL) {
 309                 int k;
 310                 int p;
 311                 int n = v->n;
 312                 unsigned total = isl_basic_map_total_dim(bmap);
 313
 314                 if (tok->type != ISL_TOKEN_IDENT)
 315                         break;
 316
 317                 p = vars_pos(v, tok->u.s, -1);
 318                 if (p < 0)
 319                         goto error;
 320                 if (p < n) {
 321                         isl_stream_error(s, tok, "expecting unique identifier");
 322                         goto error;
 323                 }
 324                 isl_token_free(tok);
 325
 326                 bmap = isl_basic_map_cow(bmap);
 327                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 328                                                 1, 0, 2);
 329
 330                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 331                         goto error;
 332                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 333
 334                 tok = isl_stream_next_token(s);
 335                 if (tok && tok->type == '=') {
 336                         isl_token_free(tok);
 337                         bmap = add_div_definition(s, v, bmap, k);
 338                         tok = isl_stream_next_token(s);
 339                 }
 340
 341                 if (!tok || tok->type != ',')
 342                         break;
 343
 344                 isl_token_free(tok);
 345         }
 346         if (tok)
 347                 isl_stream_push_token(s, tok);
 348
 349         return bmap;
 350 error:
 351         isl_token_free(tok);
 352         isl_basic_map_free(bmap);
 353         return NULL;
 354 }
 355
 356 static struct vars *read_tuple(struct isl_stream *s, struct vars *v)
 357 {
 358         struct isl_token *tok;
 359
 360         tok = isl_stream_next_token(s);
 361         if (!tok || tok->type != '[') {
 362                 isl_stream_error(s, tok, "expecting '['");
 363                 goto error;
 364         }
 365         isl_token_free(tok);
 366         v = read_var_list(s, v);
 367         tok = isl_stream_next_token(s);
 368         if (!tok || tok->type != ']') {
 369                 isl_stream_error(s, tok, "expecting ']'");
 370                 goto error;
 371         }
 372         isl_token_free(tok);
 373
 374         return v;
 375 error:
 376         if (tok)
 377                 isl_token_free(tok);
 378         vars_free(v);
 379         return NULL;
 380 }
 381
 382 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 383         struct vars *v, struct isl_basic_map *bmap);
 384
 385 static struct isl_basic_map *add_exists(struct isl_stream *s,
 386         struct vars *v, struct isl_basic_map *bmap)
 387 {
 388         struct isl_token *tok;
 389         int n = v->n;
 390         int extra;
 391         int seen_paren = 0;
 392         int i;
 393         unsigned total;
 394
 395         tok = isl_stream_next_token(s);
 396         if (!tok)
 397                 goto error;
 398         if (tok->type == '(') {
 399                 seen_paren = 1;
 400                 isl_token_free(tok);
 401         } else
 402                 isl_stream_push_token(s, tok);
 403
 404         bmap = read_defined_var_list(s, v, bmap);
 405         if (!bmap)
 406                 goto error;
 407
 408         if (isl_stream_eat(s, ':'))
 409                 goto error;
 410         bmap = add_constraints(s, v, bmap);
 411         if (seen_paren && isl_stream_eat(s, ')'))
 412                 goto error;
 413         return bmap;
 414 error:
 415         isl_basic_map_free(bmap);
 416         return NULL;
 417 }
 418
 419 static __isl_give isl_basic_map *construct_constraint(
 420         __isl_take isl_basic_map *bmap, enum isl_token_type type,
 421         isl_int *left, isl_int *right)
 422 {
 423         int k;
 424         unsigned len;
 425         struct isl_ctx *ctx;
 426
 427         if (!bmap)
 428                 return NULL;
 429         len = 1 + isl_basic_map_total_dim(bmap);
 430         ctx = bmap->ctx;
 431
 432         k = isl_basic_map_alloc_inequality(bmap);
 433         if (k < 0)
 434                 goto error;
 435         if (type == ISL_TOKEN_LE)
 436                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 437                                                ctx->one, right,
 438                                                len);
 439         else if (type == ISL_TOKEN_GE)
 440                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 441                                                ctx->negone, right,
 442                                                len);
 443         else if (type == ISL_TOKEN_LT) {
 444                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 445                                                ctx->one, right,
 446                                                len);
 447                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 448         } else if (type == ISL_TOKEN_GT) {
 449                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 450                                                ctx->negone, right,
 451                                                len);
 452                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 453         } else {
 454                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 455                                                ctx->negone, right,
 456                                                len);
 457                 isl_basic_map_inequality_to_equality(bmap, k);
 458         }
 459
 460         return bmap;
 461 error:
 462         isl_basic_map_free(bmap);
 463         return NULL;
 464 }
 465
 466 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 467         struct vars *v, struct isl_basic_map *bmap)
 468 {
 469         int i, j;
 470         unsigned total = isl_basic_map_total_dim(bmap);
 471         struct isl_token *tok = NULL;
 472         struct isl_mat *aff1 = NULL, *aff2 = NULL;
 473
 474         tok = isl_stream_next_token(s);
 475         if (!tok)
 476                 goto error;
 477         if (tok->type == ISL_TOKEN_EXISTS) {
 478                 isl_token_free(tok);
 479                 return add_exists(s, v, bmap);
 480         }
 481         isl_stream_push_token(s, tok);
 482         tok = NULL;
 483
 484         bmap = isl_basic_map_cow(bmap);
 485
 486         aff1 = accept_affine_list(s, v);
 487         if (!aff1)
 488                 goto error;
 489         tok = isl_stream_next_token(s);
 490         switch (tok->type) {
 491         case ISL_TOKEN_LT:
 492         case ISL_TOKEN_GT:
 493         case ISL_TOKEN_LE:
 494         case ISL_TOKEN_GE:
 495         case '=':
 496                 break;
 497         default:
 498                 isl_stream_error(s, tok, "missing operator");
 499                 isl_stream_push_token(s, tok);
 500                 tok = NULL;
 501                 goto error;
 502         }
 503         aff2 = accept_affine_list(s, v);
 504         if (!aff2)
 505                 goto error;
 506         isl_assert(aff1->ctx, aff1->n_col == 1 + total, goto error);
 507         isl_assert(aff2->ctx, aff2->n_col == 1 + total, goto error);
 508
 509         bmap = isl_basic_map_extend_constraints(bmap, 0, aff1->n_row * aff2->n_row);
 510         for (i = 0; i < aff1->n_row; ++i)
 511                 for (j = 0; j < aff2->n_row; ++j)
 512                         bmap = construct_constraint(bmap, tok->type,
 513                                                     aff1->row[i], aff2->row[j]);
 514         isl_token_free(tok);
 515         isl_mat_free(aff1);
 516         isl_mat_free(aff2);
 517
 518         return bmap;
 519 error:
 520         if (tok)
 521                 isl_token_free(tok);
 522         isl_mat_free(aff1);
 523         isl_mat_free(aff2);
 524         isl_basic_map_free(bmap);
 525         return NULL;
 526 }
 527
 528 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 529         struct vars *v, struct isl_basic_map *bmap)
 530 {
 531         struct isl_token *tok;
 532
 533         for (;;) {
 534                 bmap = add_constraint(s, v, bmap);
 535                 if (!bmap)
 536                         return NULL;
 537                 tok = isl_stream_next_token(s);
 538                 if (!tok) {
 539                         isl_stream_error(s, NULL, "unexpected EOF");
 540                         goto error;
 541                 }
 542                 if (tok->type != ISL_TOKEN_AND)
 543                         break;
 544                 isl_token_free(tok);
 545         }
 546         isl_stream_push_token(s, tok);
 547
 548         return bmap;
 549 error:
 550         if (tok)
 551                 isl_token_free(tok);
 552         isl_basic_map_free(bmap);
 553         return NULL;
 554 }
 555
 556 static struct isl_basic_map *read_disjunct(struct isl_stream *s,
 557         struct vars *v, __isl_take isl_dim *dim)
 558 {
 559         struct isl_basic_map *bmap;
 560
 561         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 562         if (!bmap)
 563                 return NULL;
 564
 565         bmap = add_constraints(s, v, bmap);
 566         bmap = isl_basic_map_simplify(bmap);
 567         bmap = isl_basic_map_finalize(bmap);
 568         return bmap;
 569 }
 570
 571 static struct isl_map *read_disjuncts(struct isl_stream *s,
 572         struct vars *v, __isl_take isl_dim *dim)
 573 {
 574         struct isl_token *tok;
 575         struct isl_map *map;
 576
 577         tok = isl_stream_next_token(s);
 578         if (!tok) {
 579                 isl_stream_error(s, NULL, "unexpected EOF");
 580                 goto error;
 581         }
 582         if (tok->type == '}') {
 583                 isl_stream_push_token(s, tok);
 584                 return isl_map_universe(dim);
 585         }
 586         isl_stream_push_token(s, tok);
 587
 588         map = isl_map_empty(isl_dim_copy(dim));
 589         for (;;) {
 590                 struct isl_basic_map *bmap;
 591
 592                 bmap = read_disjunct(s, v, isl_dim_copy(dim));
 593                 map = isl_map_union(map, isl_map_from_basic_map(bmap));
 594
 595                 tok = isl_stream_next_token(s);
 596                 if (!tok || tok->type != ISL_TOKEN_OR)
 597                         break;
 598                 isl_token_free(tok);
 599         }
 600         if (tok)
 601                 isl_stream_push_token(s, tok);
 602
 603         isl_dim_free(dim);
 604         return map;
 605 error:
 606         isl_dim_free(dim);
 607         return NULL;
 608 }
 609
 610 static int polylib_pos_to_isl_pos(__isl_keep isl_basic_map *bmap, int pos)
 611 {
 612         if (pos < isl_basic_map_dim(bmap, isl_dim_out))
 613                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 614                            isl_basic_map_dim(bmap, isl_dim_in) + pos;
 615         pos -= isl_basic_map_dim(bmap, isl_dim_out);
 616
 617         if (pos < isl_basic_map_dim(bmap, isl_dim_in))
 618                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) + pos;
 619         pos -= isl_basic_map_dim(bmap, isl_dim_in);
 620
 621         if (pos < isl_basic_map_dim(bmap, isl_dim_div))
 622                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 623                            isl_basic_map_dim(bmap, isl_dim_in) +
 624                            isl_basic_map_dim(bmap, isl_dim_out) + pos;
 625         pos -= isl_basic_map_dim(bmap, isl_dim_div);
 626
 627         if (pos < isl_basic_map_dim(bmap, isl_dim_param))
 628                 return 1 + pos;
 629
 630         return 0;
 631 }
 632
 633 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 634         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 635 {
 636         int j;
 637         struct isl_token *tok;
 638         int type;
 639         int k;
 640         isl_int *c;
 641         unsigned nparam;
 642         unsigned dim;
 643
 644         if (!bmap)
 645                 return NULL;
 646
 647         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 648         dim = isl_basic_map_dim(bmap, isl_dim_out);
 649
 650         tok = isl_stream_next_token(s);
 651         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 652                 isl_stream_error(s, tok, "expecting coefficient");
 653                 if (tok)
 654                         isl_stream_push_token(s, tok);
 655                 goto error;
 656         }
 657         if (!tok->on_new_line) {
 658                 isl_stream_error(s, tok, "coefficient should appear on new line");
 659                 isl_stream_push_token(s, tok);
 660                 goto error;
 661         }
 662
 663         type = isl_int_get_si(tok->u.v);
 664         isl_token_free(tok);
 665
 666         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 667         if (type == 0) {
 668                 k = isl_basic_map_alloc_equality(bmap);
 669                 c = bmap->eq[k];
 670         } else {
 671                 k = isl_basic_map_alloc_inequality(bmap);
 672                 c = bmap->ineq[k];
 673         }
 674         if (k < 0)
 675                 goto error;
 676
 677         for (j = 0; j < 1 + isl_basic_map_total_dim(bmap); ++j) {
 678                 int pos;
 679                 tok = isl_stream_next_token(s);
 680                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 681                         isl_stream_error(s, tok, "expecting coefficient");
 682                         if (tok)
 683                                 isl_stream_push_token(s, tok);
 684                         goto error;
 685                 }
 686                 if (tok->on_new_line) {
 687                         isl_stream_error(s, tok,
 688                                 "coefficient should not appear on new line");
 689                         isl_stream_push_token(s, tok);
 690                         goto error;
 691                 }
 692                 pos = polylib_pos_to_isl_pos(bmap, j);
 693                 isl_int_set(c[pos], tok->u.v);
 694                 isl_token_free(tok);
 695         }
 696
 697         return bmap;
 698 error:
 699         isl_basic_map_free(bmap);
 700         return NULL;
 701 }
 702
 703 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
 704         int nparam)
 705 {
 706         int i;
 707         struct isl_token *tok;
 708         struct isl_token *tok2;
 709         int n_row, n_col;
 710         int on_new_line;
 711         unsigned in = 0, out, local = 0;
 712         struct isl_basic_map *bmap = NULL;
 713
 714         if (nparam < 0)
 715                 nparam = 0;
 716
 717         tok = isl_stream_next_token(s);
 718         if (!tok) {
 719                 isl_stream_error(s, NULL, "unexpected EOF");
 720                 return NULL;
 721         }
 722         tok2 = isl_stream_next_token(s);
 723         if (!tok2) {
 724                 isl_token_free(tok);
 725                 isl_stream_error(s, NULL, "unexpected EOF");
 726                 return NULL;
 727         }
 728         n_row = isl_int_get_si(tok->u.v);
 729         n_col = isl_int_get_si(tok2->u.v);
 730         on_new_line = tok2->on_new_line;
 731         isl_token_free(tok2);
 732         isl_token_free(tok);
 733         isl_assert(s->ctx, !on_new_line, return NULL);
 734         isl_assert(s->ctx, n_row >= 0, return NULL);
 735         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
 736         tok = isl_stream_next_token_on_same_line(s);
 737         if (tok) {
 738                 if (tok->type != ISL_TOKEN_VALUE) {
 739                         isl_stream_error(s, tok,
 740                                     "expecting number of output dimensions");
 741                         isl_stream_push_token(s, tok);
 742                         goto error;
 743                 }
 744                 out = isl_int_get_si(tok->u.v);
 745                 isl_token_free(tok);
 746
 747                 tok = isl_stream_next_token_on_same_line(s);
 748                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 749                         isl_stream_error(s, tok,
 750                                     "expecting number of input dimensions");
 751                         if (tok)
 752                                 isl_stream_push_token(s, tok);
 753                         goto error;
 754                 }
 755                 in = isl_int_get_si(tok->u.v);
 756                 isl_token_free(tok);
 757
 758                 tok = isl_stream_next_token_on_same_line(s);
 759                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 760                         isl_stream_error(s, tok,
 761                                     "expecting number of existentials");
 762                         if (tok)
 763                                 isl_stream_push_token(s, tok);
 764                         goto error;
 765                 }
 766                 local = isl_int_get_si(tok->u.v);
 767                 isl_token_free(tok);
 768
 769                 tok = isl_stream_next_token_on_same_line(s);
 770                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 771                         isl_stream_error(s, tok,
 772                                     "expecting number of parameters");
 773                         if (tok)
 774                                 isl_stream_push_token(s, tok);
 775                         goto error;
 776                 }
 777                 nparam = isl_int_get_si(tok->u.v);
 778                 isl_token_free(tok);
 779                 if (n_col != 1 + out + in + local + nparam + 1) {
 780                         isl_stream_error(s, NULL,
 781                                     "dimensions don't match");
 782                         goto error;
 783                 }
 784         } else
 785                 out = n_col - 2 - nparam;
 786         bmap = isl_basic_map_alloc(s->ctx, nparam, in, out, local, n_row, n_row);
 787         if (!bmap)
 788                 return NULL;
 789
 790         for (i = 0; i < local; ++i) {
 791                 int k = isl_basic_map_alloc_div(bmap);
 792                 if (k < 0)
 793                         goto error;
 794         }
 795
 796         for (i = 0; i < n_row; ++i)
 797                 bmap = basic_map_read_polylib_constraint(s, bmap);
 798
 799         bmap = isl_basic_map_simplify(bmap);
 800         bmap = isl_basic_map_finalize(bmap);
 801         return bmap;
 802 error:
 803         isl_basic_map_free(bmap);
 804         return NULL;
 805 }
 806
 807 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
 808 {
 809         struct isl_token *tok;
 810         struct isl_token *tok2;
 811         int i, n;
 812         struct isl_map *map;
 813
 814         tok = isl_stream_next_token(s);
 815         if (!tok) {
 816                 isl_stream_error(s, NULL, "unexpected EOF");
 817                 return NULL;
 818         }
 819         tok2 = isl_stream_next_token(s);
 820         if (!tok2) {
 821                 isl_token_free(tok);
 822                 isl_stream_error(s, NULL, "unexpected EOF");
 823                 return NULL;
 824         }
 825         if (!tok2->on_new_line) {
 826                 isl_stream_push_token(s, tok2);
 827                 isl_stream_push_token(s, tok);
 828                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 829         }
 830         isl_stream_push_token(s, tok2);
 831         n = isl_int_get_si(tok->u.v);
 832         isl_token_free(tok);
 833
 834         isl_assert(s->ctx, n >= 1, return NULL);
 835
 836         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 837
 838         for (i = 1; i < n; ++i)
 839                 map = isl_map_union(map,
 840                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
 841
 842         return map;
 843 }
 844
 845 static struct isl_dim *set_names(struct isl_dim *dim, struct vars *vars,
 846         enum isl_dim_type type, int offset, int n)
 847 {
 848         int i;
 849         struct variable *v;
 850
 851         for (i = 0, v = vars->v; i < offset; ++i, v = v->next)
 852                 ;
 853         for (i = n - 1; i >= 0; --i, v = v->next)
 854                 dim = isl_dim_set_name(dim, type, i, v->name);
 855
 856         return dim;
 857 }
 858
 859 static struct isl_dim *dim_from_vars(struct vars *vars,
 860         int nparam, int n_in, int n_out)
 861 {
 862         struct isl_dim *dim;
 863
 864         dim = isl_dim_alloc(vars->ctx, nparam, n_in, n_out);
 865         dim = set_names(dim, vars, isl_dim_param, n_out + n_in, nparam);
 866         dim = set_names(dim, vars, isl_dim_in, n_out, n_in);
 867         dim = set_names(dim, vars, isl_dim_out, 0, n_out);
 868
 869         return dim;
 870 }
 871
 872 static struct isl_map *map_read(struct isl_stream *s, int nparam)
 873 {
 874         struct isl_dim *dim = NULL;
 875         struct isl_map *map = NULL;
 876         struct isl_token *tok;
 877         struct vars *v = NULL;
 878         int n1;
 879         int n2;
 880
 881         tok = isl_stream_next_token(s);
 882         if (!tok) {
 883                 isl_stream_error(s, NULL, "unexpected EOF");
 884                 goto error;
 885         }
 886         if (tok->type == ISL_TOKEN_VALUE) {
 887                 isl_stream_push_token(s, tok);
 888                 return map_read_polylib(s, nparam);
 889         }
 890         v = vars_new(s->ctx);
 891         if (tok->type == '[') {
 892                 isl_stream_push_token(s, tok);
 893                 v = read_tuple(s, v);
 894                 if (!v)
 895                         return NULL;
 896                 if (nparam >= 0)
 897                         isl_assert(s->ctx, nparam == v->n, goto error);
 898                 nparam = v->n;
 899                 tok = isl_stream_next_token(s);
 900                 if (!tok || tok->type != ISL_TOKEN_TO) {
 901                         isl_stream_error(s, tok, "expecting '->'");
 902                         if (tok)
 903                                 isl_stream_push_token(s, tok);
 904                         goto error;
 905                 }
 906                 isl_token_free(tok);
 907                 tok = isl_stream_next_token(s);
 908         }
 909         if (nparam < 0)
 910                 nparam = 0;
 911         if (!tok || tok->type != '{') {
 912                 isl_stream_error(s, tok, "expecting '{'");
 913                 if (tok)
 914                         isl_stream_push_token(s, tok);
 915                 goto error;
 916         }
 917         isl_token_free(tok);
 918         v = read_tuple(s, v);
 919         if (!v)
 920                 return NULL;
 921         n1 = v->n - nparam;
 922         tok = isl_stream_next_token(s);
 923         if (tok && tok->type == ISL_TOKEN_TO) {
 924                 isl_token_free(tok);
 925                 v = read_tuple(s, v);
 926                 if (!v)
 927                         return NULL;
 928                 n2 = v->n - n1 - nparam;
 929         } else {
 930                 if (tok)
 931                         isl_stream_push_token(s, tok);
 932                 n2 = n1;
 933                 n1 = 0;
 934         }
 935         dim = dim_from_vars(v, nparam, n1, n2);
 936         tok = isl_stream_next_token(s);
 937         if (!tok) {
 938                 isl_stream_error(s, NULL, "unexpected EOF");
 939                 goto error;
 940         }
 941         if (tok->type == ':') {
 942                 isl_token_free(tok);
 943                 map = read_disjuncts(s, v, isl_dim_copy(dim));
 944                 tok = isl_stream_next_token(s);
 945         } else
 946                 map = isl_map_universe(isl_dim_copy(dim));
 947         if (tok && tok->type == '}') {
 948                 isl_token_free(tok);
 949         } else {
 950                 isl_stream_error(s, tok, "unexpected isl_token");
 951                 if (tok)
 952                         isl_token_free(tok);
 953                 goto error;
 954         }
 955         vars_free(v);
 956         isl_dim_free(dim);
 957
 958         return map;
 959 error:
 960         isl_dim_free(dim);
 961         isl_map_free(map);
 962         if (v)
 963                 vars_free(v);
 964         return NULL;
 965 }
 966
 967 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
 968 {
 969         struct isl_map *map;
 970         struct isl_basic_map *bmap;
 971
 972         map = map_read(s, nparam);
 973         if (!map)
 974                 return NULL;
 975
 976         isl_assert(map->ctx, map->n <= 1, goto error);
 977
 978         if (map->n == 0)
 979                 bmap = isl_basic_map_empty_like_map(map);
 980         else
 981                 bmap = isl_basic_map_copy(map->p[0]);
 982
 983         isl_map_free(map);
 984
 985         return bmap;
 986 error:
 987         isl_map_free(map);
 988         return NULL;
 989 }
 990
 991 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
 992                 FILE *input, int nparam)
 993 {
 994         struct isl_basic_map *bmap;
 995         struct isl_stream *s = isl_stream_new_file(ctx, input);
 996         if (!s)
 997                 return NULL;
 998         bmap = basic_map_read(s, nparam);
 999         isl_stream_free(s);
1000         return bmap;
1001 }
1002
1003 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
1004                 FILE *input, int nparam)
1005 {
1006         struct isl_basic_map *bmap;
1007         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
1008         if (!bmap)
1009                 return NULL;
1010         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1011         return (struct isl_basic_set *)bmap;
1012 error:
1013         isl_basic_map_free(bmap);
1014         return NULL;
1015 }
1016
1017 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
1018                 const char *str, int nparam)
1019 {
1020         struct isl_basic_map *bmap;
1021         struct isl_stream *s = isl_stream_new_str(ctx, str);
1022         if (!s)
1023                 return NULL;
1024         bmap = basic_map_read(s, nparam);
1025         isl_stream_free(s);
1026         return bmap;
1027 }
1028
1029 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
1030                 const char *str, int nparam)
1031 {
1032         struct isl_basic_map *bmap;
1033         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
1034         if (!bmap)
1035                 return NULL;
1036         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1037         return (struct isl_basic_set *)bmap;
1038 error:
1039         isl_basic_map_free(bmap);
1040         return NULL;
1041 }
1042
1043 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
1044                 FILE *input, int nparam)
1045 {
1046         struct isl_map *map;
1047         struct isl_stream *s = isl_stream_new_file(ctx, input);
1048         if (!s)
1049                 return NULL;
1050         map = map_read(s, nparam);
1051         isl_stream_free(s);
1052         return map;
1053 }
1054
1055 __isl_give isl_map *isl_map_read_from_str(struct isl_ctx *ctx,
1056                 const char *str, int nparam)
1057 {
1058         struct isl_map *map;
1059         struct isl_stream *s = isl_stream_new_str(ctx, str);
1060         if (!s)
1061                 return NULL;
1062         map = map_read(s, nparam);
1063         isl_stream_free(s);
1064         return map;
1065 }
1066
1067 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
1068                 FILE *input, int nparam)
1069 {
1070         struct isl_map *map;
1071         map = isl_map_read_from_file(ctx, input, nparam);
1072         if (!map)
1073                 return NULL;
1074         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1075         return (struct isl_set *)map;
1076 error:
1077         isl_map_free(map);
1078         return NULL;
1079 }
1080
1081 struct isl_set *isl_set_read_from_str(struct isl_ctx *ctx,
1082                 const char *str, int nparam)
1083 {
1084         struct isl_map *map;
1085         map = isl_map_read_from_str(ctx, str, nparam);
1086         if (!map)
1087                 return NULL;
1088         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1089         return (struct isl_set *)map;
1090 error:
1091         isl_map_free(map);
1092         return NULL;
1093 }
1094
1095 static char *next_line(FILE *input, char *line, unsigned len)
1096 {
1097         char *p;
1098
1099         do {
1100                 if (!(p = fgets(line, len, input)))
1101                         return NULL;
1102                 while (isspace(*p) && *p != '\n')
1103                         ++p;
1104         } while (*p == '#' || *p == '\n');
1105
1106         return p;
1107 }
1108
1109 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
1110                 FILE *input)
1111 {
1112         struct isl_vec *vec = NULL;
1113         char line[1024];
1114         char val[1024];
1115         char *p;
1116         unsigned size;
1117         int j;
1118         int n;
1119         int offset;
1120
1121         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
1122         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
1123
1124         vec = isl_vec_alloc(ctx, size);
1125
1126         p = next_line(input, line, sizeof(line));
1127         isl_assert(ctx, p, goto error);
1128
1129         for (j = 0; j < size; ++j) {
1130                 n = sscanf(p, "%s%n", val, &offset);
1131                 isl_assert(ctx, n != 0, goto error);
1132                 isl_int_read(vec->el[j], val);
1133                 p += offset;
1134         }
1135
1136         return vec;
1137 error:
1138         isl_vec_free(vec);
1139         return NULL;
1140 }
1141
1142 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
1143                 FILE *input, unsigned input_format)
1144 {
1145         if (input_format == ISL_FORMAT_POLYLIB)
1146                 return isl_vec_read_from_file_polylib(ctx, input);
1147         else
1148                 isl_assert(ctx, 0, return NULL);
1149 }