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 void vars_drop(struct vars *v, int n)
  65 {
  66         struct variable *var;
  67
  68         if (!v)
  69                 return;
  70
  71         v->n -= n;
  72
  73         var = v->v;
  74         while (--n >= 0) {
  75                 struct variable *next = var->next;
  76                 free(var->name);
  77                 free(var);
  78                 var = next;
  79         }
  80         v->v = var;
  81 }
  82
  83 static struct variable *variable_new(struct vars *v, const char *name, int len,
  84                                 int pos)
  85 {
  86         struct variable *var;
  87         var = isl_alloc_type(v->ctx, struct variable);
  88         if (!var)
  89                 goto error;
  90         var->name = strdup(name);
  91         var->name[len] = '\0';
  92         var->pos = pos;
  93         var->next = v->v;
  94         return var;
  95 error:
  96         variable_free(v->v);
  97         return NULL;
  98 }
  99
 100 static int vars_pos(struct vars *v, const char *s, int len)
 101 {
 102         int pos;
 103         struct variable *q;
 104
 105         if (len == -1)
 106                 len = strlen(s);
 107         for (q = v->v; q; q = q->next) {
 108                 if (strncmp(q->name, s, len) == 0 && q->name[len] == '\0')
 109                         break;
 110         }
 111         if (q)
 112                 pos = q->pos;
 113         else {
 114                 pos = v->n;
 115                 v->v = variable_new(v, s, len, v->n);
 116                 if (!v->v)
 117                         return -1;
 118                 v->n++;
 119         }
 120         return pos;
 121 }
 122
 123 static struct vars *read_var_list(struct isl_stream *s, struct vars *v)
 124 {
 125         struct isl_token *tok;
 126
 127         while ((tok = isl_stream_next_token(s)) != NULL) {
 128                 int p;
 129                 int n = v->n;
 130
 131                 if (tok->type != ISL_TOKEN_IDENT)
 132                         break;
 133
 134                 p = vars_pos(v, tok->u.s, -1);
 135                 if (p < 0)
 136                         goto error;
 137                 if (p < n) {
 138                         isl_stream_error(s, tok, "expecting unique identifier");
 139                         goto error;
 140                 }
 141                 isl_token_free(tok);
 142                 tok = isl_stream_next_token(s);
 143                 if (!tok || tok->type != ',')
 144                         break;
 145
 146                 isl_token_free(tok);
 147         }
 148         if (tok)
 149                 isl_stream_push_token(s, tok);
 150
 151         return v;
 152 error:
 153         isl_token_free(tok);
 154         vars_free(v);
 155         return NULL;
 156 }
 157
 158 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v)
 159 {
 160         struct isl_token *tok = NULL;
 161         struct isl_vec *aff;
 162         int sign = 1;
 163
 164         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 165         isl_seq_clr(aff->el, aff->size);
 166         if (!aff)
 167                 return NULL;
 168
 169         for (;;) {
 170                 tok = isl_stream_next_token(s);
 171                 if (!tok) {
 172                         isl_stream_error(s, NULL, "unexpected EOF");
 173                         goto error;
 174                 }
 175                 if (tok->type == ISL_TOKEN_IDENT) {
 176                         int n = v->n;
 177                         int pos = vars_pos(v, tok->u.s, -1);
 178                         if (pos < 0)
 179                                 goto error;
 180                         if (pos >= n) {
 181                                 isl_stream_error(s, tok, "unknown identifier");
 182                                 goto error;
 183                         }
 184                         if (sign > 0)
 185                                 isl_int_add_ui(aff->el[1 + pos],
 186                                                aff->el[1 + pos], 1);
 187                         else
 188                                 isl_int_sub_ui(aff->el[1 + pos],
 189                                                aff->el[1 + pos], 1);
 190                         sign = 1;
 191                 } else if (tok->type == ISL_TOKEN_VALUE) {
 192                         struct isl_token *tok2;
 193                         int n = v->n;
 194                         int pos = -1;
 195                         tok2 = isl_stream_next_token(s);
 196                         if (tok2 && tok2->type == ISL_TOKEN_IDENT) {
 197                                 pos = vars_pos(v, tok2->u.s, -1);
 198                                 if (pos < 0)
 199                                         goto error;
 200                                 if (pos >= n) {
 201                                         isl_stream_error(s, tok2,
 202                                                 "unknown identifier");
 203                                         isl_token_free(tok2);
 204                                         goto error;
 205                                 }
 206                                 isl_token_free(tok2);
 207                         } else if (tok2)
 208                                 isl_stream_push_token(s, tok2);
 209                         if (sign < 0)
 210                                 isl_int_neg(tok->u.v, tok->u.v);
 211                         isl_int_add(aff->el[1 + pos],
 212                                         aff->el[1 + pos], tok->u.v);
 213                         sign = 1;
 214                 } else if (tok->type == '-') {
 215                         sign = -sign;
 216                 } else if (tok->type == '+') {
 217                         /* nothing */
 218                 } else {
 219                         isl_stream_push_token(s, tok);
 220                         break;
 221                 }
 222                 isl_token_free(tok);
 223         }
 224
 225         return aff;
 226 error:
 227         isl_vec_free(aff);
 228         return NULL;
 229 }
 230
 231 static __isl_give isl_mat *accept_affine_list(struct isl_stream *s,
 232         struct vars *v)
 233 {
 234         struct isl_vec *vec;
 235         struct isl_mat *mat;
 236         struct isl_token *tok = NULL;
 237
 238         vec = accept_affine(s, v);
 239         mat = isl_mat_from_row_vec(vec);
 240         if (!mat)
 241                 return NULL;
 242
 243         for (;;) {
 244                 tok = isl_stream_next_token(s);
 245                 if (!tok) {
 246                         isl_stream_error(s, NULL, "unexpected EOF");
 247                         goto error;
 248                 }
 249                 if (tok->type != ',') {
 250                         isl_stream_push_token(s, tok);
 251                         break;
 252                 }
 253                 isl_token_free(tok);
 254
 255                 vec = accept_affine(s, v);
 256                 mat = isl_mat_vec_concat(mat, vec);
 257                 if (!mat)
 258                         return NULL;
 259         }
 260
 261         return mat;
 262 error:
 263         isl_mat_free(mat);
 264         return NULL;
 265 }
 266
 267 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 268         struct vars *v, struct isl_basic_map *bmap, int k)
 269 {
 270         struct isl_token *tok;
 271         int seen_paren = 0;
 272         struct isl_vec *aff;
 273
 274         if (isl_stream_eat(s, '['))
 275                 goto error;
 276
 277         tok = isl_stream_next_token(s);
 278         if (!tok)
 279                 goto error;
 280         if (tok->type == '(') {
 281                 seen_paren = 1;
 282                 isl_token_free(tok);
 283         } else
 284                 isl_stream_push_token(s, tok);
 285
 286         aff = accept_affine(s, v);
 287         if (!aff)
 288                 goto error;
 289
 290         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 291
 292         isl_vec_free(aff);
 293
 294         if (seen_paren && isl_stream_eat(s, ')'))
 295                 goto error;
 296         if (isl_stream_eat(s, '/'))
 297                 goto error;
 298
 299         tok = isl_stream_next_token(s);
 300         if (!tok)
 301                 goto error;
 302         if (tok->type != ISL_TOKEN_VALUE) {
 303                 isl_stream_error(s, tok, "expected denominator");
 304                 isl_stream_push_token(s, tok);
 305                 goto error;
 306         }
 307         isl_int_set(bmap->div[k][0], tok->u.v);
 308         isl_token_free(tok);
 309
 310         if (isl_stream_eat(s, ']'))
 311                 goto error;
 312
 313         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 314                 goto error;
 315
 316         return bmap;
 317 error:
 318         isl_basic_map_free(bmap);
 319         return NULL;
 320 }
 321
 322 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 323         struct vars *v, struct isl_basic_map *bmap)
 324 {
 325         struct isl_token *tok;
 326
 327         while ((tok = isl_stream_next_token(s)) != NULL) {
 328                 int k;
 329                 int p;
 330                 int n = v->n;
 331                 unsigned total = isl_basic_map_total_dim(bmap);
 332
 333                 if (tok->type != ISL_TOKEN_IDENT)
 334                         break;
 335
 336                 p = vars_pos(v, tok->u.s, -1);
 337                 if (p < 0)
 338                         goto error;
 339                 if (p < n) {
 340                         isl_stream_error(s, tok, "expecting unique identifier");
 341                         goto error;
 342                 }
 343                 isl_token_free(tok);
 344
 345                 bmap = isl_basic_map_cow(bmap);
 346                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 347                                                 1, 0, 2);
 348
 349                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 350                         goto error;
 351                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 352
 353                 tok = isl_stream_next_token(s);
 354                 if (tok && tok->type == '=') {
 355                         isl_token_free(tok);
 356                         bmap = add_div_definition(s, v, bmap, k);
 357                         tok = isl_stream_next_token(s);
 358                 }
 359
 360                 if (!tok || tok->type != ',')
 361                         break;
 362
 363                 isl_token_free(tok);
 364         }
 365         if (tok)
 366                 isl_stream_push_token(s, tok);
 367
 368         return bmap;
 369 error:
 370         isl_token_free(tok);
 371         isl_basic_map_free(bmap);
 372         return NULL;
 373 }
 374
 375 static struct vars *read_tuple(struct isl_stream *s, struct vars *v)
 376 {
 377         struct isl_token *tok;
 378
 379         tok = isl_stream_next_token(s);
 380         if (!tok || tok->type != '[') {
 381                 isl_stream_error(s, tok, "expecting '['");
 382                 goto error;
 383         }
 384         isl_token_free(tok);
 385         v = read_var_list(s, v);
 386         tok = isl_stream_next_token(s);
 387         if (!tok || tok->type != ']') {
 388                 isl_stream_error(s, tok, "expecting ']'");
 389                 goto error;
 390         }
 391         isl_token_free(tok);
 392
 393         return v;
 394 error:
 395         if (tok)
 396                 isl_token_free(tok);
 397         vars_free(v);
 398         return NULL;
 399 }
 400
 401 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 402         struct vars *v, struct isl_basic_map *bmap);
 403
 404 static struct isl_basic_map *add_exists(struct isl_stream *s,
 405         struct vars *v, struct isl_basic_map *bmap)
 406 {
 407         struct isl_token *tok;
 408         int n = v->n;
 409         int extra;
 410         int seen_paren = 0;
 411         int i;
 412         unsigned total;
 413
 414         tok = isl_stream_next_token(s);
 415         if (!tok)
 416                 goto error;
 417         if (tok->type == '(') {
 418                 seen_paren = 1;
 419                 isl_token_free(tok);
 420         } else
 421                 isl_stream_push_token(s, tok);
 422
 423         bmap = read_defined_var_list(s, v, bmap);
 424         if (!bmap)
 425                 goto error;
 426
 427         if (isl_stream_eat(s, ':'))
 428                 goto error;
 429         bmap = add_constraints(s, v, bmap);
 430         if (seen_paren && isl_stream_eat(s, ')'))
 431                 goto error;
 432         return bmap;
 433 error:
 434         isl_basic_map_free(bmap);
 435         return NULL;
 436 }
 437
 438 static __isl_give isl_basic_map *construct_constraint(
 439         __isl_take isl_basic_map *bmap, enum isl_token_type type,
 440         isl_int *left, isl_int *right)
 441 {
 442         int k;
 443         unsigned len;
 444         struct isl_ctx *ctx;
 445
 446         if (!bmap)
 447                 return NULL;
 448         len = 1 + isl_basic_map_total_dim(bmap);
 449         ctx = bmap->ctx;
 450
 451         k = isl_basic_map_alloc_inequality(bmap);
 452         if (k < 0)
 453                 goto error;
 454         if (type == ISL_TOKEN_LE)
 455                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 456                                                ctx->one, right,
 457                                                len);
 458         else if (type == ISL_TOKEN_GE)
 459                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 460                                                ctx->negone, right,
 461                                                len);
 462         else if (type == ISL_TOKEN_LT) {
 463                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 464                                                ctx->one, right,
 465                                                len);
 466                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 467         } else if (type == ISL_TOKEN_GT) {
 468                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 469                                                ctx->negone, right,
 470                                                len);
 471                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 472         } else {
 473                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 474                                                ctx->negone, right,
 475                                                len);
 476                 isl_basic_map_inequality_to_equality(bmap, k);
 477         }
 478
 479         return bmap;
 480 error:
 481         isl_basic_map_free(bmap);
 482         return NULL;
 483 }
 484
 485 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 486         struct vars *v, struct isl_basic_map *bmap)
 487 {
 488         int i, j;
 489         unsigned total = isl_basic_map_total_dim(bmap);
 490         struct isl_token *tok = NULL;
 491         struct isl_mat *aff1 = NULL, *aff2 = NULL;
 492
 493         tok = isl_stream_next_token(s);
 494         if (!tok)
 495                 goto error;
 496         if (tok->type == ISL_TOKEN_EXISTS) {
 497                 isl_token_free(tok);
 498                 return add_exists(s, v, bmap);
 499         }
 500         isl_stream_push_token(s, tok);
 501         tok = NULL;
 502
 503         bmap = isl_basic_map_cow(bmap);
 504
 505         aff1 = accept_affine_list(s, v);
 506         if (!aff1)
 507                 goto error;
 508         tok = isl_stream_next_token(s);
 509         switch (tok->type) {
 510         case ISL_TOKEN_LT:
 511         case ISL_TOKEN_GT:
 512         case ISL_TOKEN_LE:
 513         case ISL_TOKEN_GE:
 514         case '=':
 515                 break;
 516         default:
 517                 isl_stream_error(s, tok, "missing operator");
 518                 isl_stream_push_token(s, tok);
 519                 tok = NULL;
 520                 goto error;
 521         }
 522         aff2 = accept_affine_list(s, v);
 523         if (!aff2)
 524                 goto error;
 525         isl_assert(aff1->ctx, aff1->n_col == 1 + total, goto error);
 526         isl_assert(aff2->ctx, aff2->n_col == 1 + total, goto error);
 527
 528         bmap = isl_basic_map_extend_constraints(bmap, 0, aff1->n_row * aff2->n_row);
 529         for (i = 0; i < aff1->n_row; ++i)
 530                 for (j = 0; j < aff2->n_row; ++j)
 531                         bmap = construct_constraint(bmap, tok->type,
 532                                                     aff1->row[i], aff2->row[j]);
 533         isl_token_free(tok);
 534         isl_mat_free(aff1);
 535         isl_mat_free(aff2);
 536
 537         return bmap;
 538 error:
 539         if (tok)
 540                 isl_token_free(tok);
 541         isl_mat_free(aff1);
 542         isl_mat_free(aff2);
 543         isl_basic_map_free(bmap);
 544         return NULL;
 545 }
 546
 547 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 548         struct vars *v, struct isl_basic_map *bmap)
 549 {
 550         struct isl_token *tok;
 551
 552         for (;;) {
 553                 bmap = add_constraint(s, v, bmap);
 554                 if (!bmap)
 555                         return NULL;
 556                 tok = isl_stream_next_token(s);
 557                 if (!tok) {
 558                         isl_stream_error(s, NULL, "unexpected EOF");
 559                         goto error;
 560                 }
 561                 if (tok->type != ISL_TOKEN_AND)
 562                         break;
 563                 isl_token_free(tok);
 564         }
 565         isl_stream_push_token(s, tok);
 566
 567         return bmap;
 568 error:
 569         if (tok)
 570                 isl_token_free(tok);
 571         isl_basic_map_free(bmap);
 572         return NULL;
 573 }
 574
 575 static struct isl_basic_map *read_disjunct(struct isl_stream *s,
 576         struct vars *v, __isl_take isl_dim *dim)
 577 {
 578         struct isl_basic_map *bmap;
 579
 580         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 581         if (!bmap)
 582                 return NULL;
 583
 584         bmap = add_constraints(s, v, bmap);
 585         bmap = isl_basic_map_simplify(bmap);
 586         bmap = isl_basic_map_finalize(bmap);
 587         return bmap;
 588 }
 589
 590 static struct isl_map *read_disjuncts(struct isl_stream *s,
 591         struct vars *v, __isl_take isl_dim *dim)
 592 {
 593         struct isl_token *tok;
 594         struct isl_map *map;
 595
 596         tok = isl_stream_next_token(s);
 597         if (!tok) {
 598                 isl_stream_error(s, NULL, "unexpected EOF");
 599                 goto error;
 600         }
 601         if (tok->type == '}') {
 602                 isl_stream_push_token(s, tok);
 603                 return isl_map_universe(dim);
 604         }
 605         isl_stream_push_token(s, tok);
 606
 607         map = isl_map_empty(isl_dim_copy(dim));
 608         for (;;) {
 609                 struct isl_basic_map *bmap;
 610                 int n = v->n;
 611
 612                 bmap = read_disjunct(s, v, isl_dim_copy(dim));
 613                 map = isl_map_union(map, isl_map_from_basic_map(bmap));
 614
 615                 vars_drop(v, v->n - n);
 616
 617                 tok = isl_stream_next_token(s);
 618                 if (!tok || tok->type != ISL_TOKEN_OR)
 619                         break;
 620                 isl_token_free(tok);
 621         }
 622         if (tok)
 623                 isl_stream_push_token(s, tok);
 624
 625         isl_dim_free(dim);
 626         return map;
 627 error:
 628         isl_dim_free(dim);
 629         return NULL;
 630 }
 631
 632 static int polylib_pos_to_isl_pos(__isl_keep isl_basic_map *bmap, int pos)
 633 {
 634         if (pos < isl_basic_map_dim(bmap, isl_dim_out))
 635                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 636                            isl_basic_map_dim(bmap, isl_dim_in) + pos;
 637         pos -= isl_basic_map_dim(bmap, isl_dim_out);
 638
 639         if (pos < isl_basic_map_dim(bmap, isl_dim_in))
 640                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) + pos;
 641         pos -= isl_basic_map_dim(bmap, isl_dim_in);
 642
 643         if (pos < isl_basic_map_dim(bmap, isl_dim_div))
 644                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 645                            isl_basic_map_dim(bmap, isl_dim_in) +
 646                            isl_basic_map_dim(bmap, isl_dim_out) + pos;
 647         pos -= isl_basic_map_dim(bmap, isl_dim_div);
 648
 649         if (pos < isl_basic_map_dim(bmap, isl_dim_param))
 650                 return 1 + pos;
 651
 652         return 0;
 653 }
 654
 655 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 656         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 657 {
 658         int j;
 659         struct isl_token *tok;
 660         int type;
 661         int k;
 662         isl_int *c;
 663         unsigned nparam;
 664         unsigned dim;
 665
 666         if (!bmap)
 667                 return NULL;
 668
 669         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 670         dim = isl_basic_map_dim(bmap, isl_dim_out);
 671
 672         tok = isl_stream_next_token(s);
 673         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 674                 isl_stream_error(s, tok, "expecting coefficient");
 675                 if (tok)
 676                         isl_stream_push_token(s, tok);
 677                 goto error;
 678         }
 679         if (!tok->on_new_line) {
 680                 isl_stream_error(s, tok, "coefficient should appear on new line");
 681                 isl_stream_push_token(s, tok);
 682                 goto error;
 683         }
 684
 685         type = isl_int_get_si(tok->u.v);
 686         isl_token_free(tok);
 687
 688         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 689         if (type == 0) {
 690                 k = isl_basic_map_alloc_equality(bmap);
 691                 c = bmap->eq[k];
 692         } else {
 693                 k = isl_basic_map_alloc_inequality(bmap);
 694                 c = bmap->ineq[k];
 695         }
 696         if (k < 0)
 697                 goto error;
 698
 699         for (j = 0; j < 1 + isl_basic_map_total_dim(bmap); ++j) {
 700                 int pos;
 701                 tok = isl_stream_next_token(s);
 702                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 703                         isl_stream_error(s, tok, "expecting coefficient");
 704                         if (tok)
 705                                 isl_stream_push_token(s, tok);
 706                         goto error;
 707                 }
 708                 if (tok->on_new_line) {
 709                         isl_stream_error(s, tok,
 710                                 "coefficient should not appear on new line");
 711                         isl_stream_push_token(s, tok);
 712                         goto error;
 713                 }
 714                 pos = polylib_pos_to_isl_pos(bmap, j);
 715                 isl_int_set(c[pos], tok->u.v);
 716                 isl_token_free(tok);
 717         }
 718
 719         return bmap;
 720 error:
 721         isl_basic_map_free(bmap);
 722         return NULL;
 723 }
 724
 725 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
 726         int nparam)
 727 {
 728         int i;
 729         struct isl_token *tok;
 730         struct isl_token *tok2;
 731         int n_row, n_col;
 732         int on_new_line;
 733         unsigned in = 0, out, local = 0;
 734         struct isl_basic_map *bmap = NULL;
 735
 736         if (nparam < 0)
 737                 nparam = 0;
 738
 739         tok = isl_stream_next_token(s);
 740         if (!tok) {
 741                 isl_stream_error(s, NULL, "unexpected EOF");
 742                 return NULL;
 743         }
 744         tok2 = isl_stream_next_token(s);
 745         if (!tok2) {
 746                 isl_token_free(tok);
 747                 isl_stream_error(s, NULL, "unexpected EOF");
 748                 return NULL;
 749         }
 750         n_row = isl_int_get_si(tok->u.v);
 751         n_col = isl_int_get_si(tok2->u.v);
 752         on_new_line = tok2->on_new_line;
 753         isl_token_free(tok2);
 754         isl_token_free(tok);
 755         isl_assert(s->ctx, !on_new_line, return NULL);
 756         isl_assert(s->ctx, n_row >= 0, return NULL);
 757         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
 758         tok = isl_stream_next_token_on_same_line(s);
 759         if (tok) {
 760                 if (tok->type != ISL_TOKEN_VALUE) {
 761                         isl_stream_error(s, tok,
 762                                     "expecting number of output dimensions");
 763                         isl_stream_push_token(s, tok);
 764                         goto error;
 765                 }
 766                 out = 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 input dimensions");
 773                         if (tok)
 774                                 isl_stream_push_token(s, tok);
 775                         goto error;
 776                 }
 777                 in = isl_int_get_si(tok->u.v);
 778                 isl_token_free(tok);
 779
 780                 tok = isl_stream_next_token_on_same_line(s);
 781                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 782                         isl_stream_error(s, tok,
 783                                     "expecting number of existentials");
 784                         if (tok)
 785                                 isl_stream_push_token(s, tok);
 786                         goto error;
 787                 }
 788                 local = isl_int_get_si(tok->u.v);
 789                 isl_token_free(tok);
 790
 791                 tok = isl_stream_next_token_on_same_line(s);
 792                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 793                         isl_stream_error(s, tok,
 794                                     "expecting number of parameters");
 795                         if (tok)
 796                                 isl_stream_push_token(s, tok);
 797                         goto error;
 798                 }
 799                 nparam = isl_int_get_si(tok->u.v);
 800                 isl_token_free(tok);
 801                 if (n_col != 1 + out + in + local + nparam + 1) {
 802                         isl_stream_error(s, NULL,
 803                                     "dimensions don't match");
 804                         goto error;
 805                 }
 806         } else
 807                 out = n_col - 2 - nparam;
 808         bmap = isl_basic_map_alloc(s->ctx, nparam, in, out, local, n_row, n_row);
 809         if (!bmap)
 810                 return NULL;
 811
 812         for (i = 0; i < local; ++i) {
 813                 int k = isl_basic_map_alloc_div(bmap);
 814                 if (k < 0)
 815                         goto error;
 816         }
 817
 818         for (i = 0; i < n_row; ++i)
 819                 bmap = basic_map_read_polylib_constraint(s, bmap);
 820
 821         bmap = isl_basic_map_simplify(bmap);
 822         bmap = isl_basic_map_finalize(bmap);
 823         return bmap;
 824 error:
 825         isl_basic_map_free(bmap);
 826         return NULL;
 827 }
 828
 829 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
 830 {
 831         struct isl_token *tok;
 832         struct isl_token *tok2;
 833         int i, n;
 834         struct isl_map *map;
 835
 836         tok = isl_stream_next_token(s);
 837         if (!tok) {
 838                 isl_stream_error(s, NULL, "unexpected EOF");
 839                 return NULL;
 840         }
 841         tok2 = isl_stream_next_token(s);
 842         if (!tok2) {
 843                 isl_token_free(tok);
 844                 isl_stream_error(s, NULL, "unexpected EOF");
 845                 return NULL;
 846         }
 847         if (!tok2->on_new_line) {
 848                 isl_stream_push_token(s, tok2);
 849                 isl_stream_push_token(s, tok);
 850                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 851         }
 852         isl_stream_push_token(s, tok2);
 853         n = isl_int_get_si(tok->u.v);
 854         isl_token_free(tok);
 855
 856         isl_assert(s->ctx, n >= 1, return NULL);
 857
 858         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 859
 860         for (i = 1; i < n; ++i)
 861                 map = isl_map_union(map,
 862                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
 863
 864         return map;
 865 }
 866
 867 static struct isl_dim *set_names(struct isl_dim *dim, struct vars *vars,
 868         enum isl_dim_type type, int offset, int n)
 869 {
 870         int i;
 871         struct variable *v;
 872
 873         for (i = 0, v = vars->v; i < offset; ++i, v = v->next)
 874                 ;
 875         for (i = n - 1; i >= 0; --i, v = v->next)
 876                 dim = isl_dim_set_name(dim, type, i, v->name);
 877
 878         return dim;
 879 }
 880
 881 static struct isl_dim *dim_from_vars(struct vars *vars,
 882         int nparam, int n_in, int n_out)
 883 {
 884         struct isl_dim *dim;
 885
 886         dim = isl_dim_alloc(vars->ctx, nparam, n_in, n_out);
 887         dim = set_names(dim, vars, isl_dim_param, n_out + n_in, nparam);
 888         dim = set_names(dim, vars, isl_dim_in, n_out, n_in);
 889         dim = set_names(dim, vars, isl_dim_out, 0, n_out);
 890
 891         return dim;
 892 }
 893
 894 static struct isl_map *map_read(struct isl_stream *s, int nparam)
 895 {
 896         struct isl_dim *dim = NULL;
 897         struct isl_map *map = NULL;
 898         struct isl_token *tok;
 899         struct vars *v = NULL;
 900         int n1;
 901         int n2;
 902
 903         tok = isl_stream_next_token(s);
 904         if (!tok) {
 905                 isl_stream_error(s, NULL, "unexpected EOF");
 906                 goto error;
 907         }
 908         if (tok->type == ISL_TOKEN_VALUE) {
 909                 isl_stream_push_token(s, tok);
 910                 return map_read_polylib(s, nparam);
 911         }
 912         v = vars_new(s->ctx);
 913         if (tok->type == '[') {
 914                 isl_stream_push_token(s, tok);
 915                 v = read_tuple(s, v);
 916                 if (!v)
 917                         return NULL;
 918                 if (nparam >= 0)
 919                         isl_assert(s->ctx, nparam == v->n, goto error);
 920                 nparam = v->n;
 921                 tok = isl_stream_next_token(s);
 922                 if (!tok || tok->type != ISL_TOKEN_TO) {
 923                         isl_stream_error(s, tok, "expecting '->'");
 924                         if (tok)
 925                                 isl_stream_push_token(s, tok);
 926                         goto error;
 927                 }
 928                 isl_token_free(tok);
 929                 tok = isl_stream_next_token(s);
 930         }
 931         if (nparam < 0)
 932                 nparam = 0;
 933         if (!tok || tok->type != '{') {
 934                 isl_stream_error(s, tok, "expecting '{'");
 935                 if (tok)
 936                         isl_stream_push_token(s, tok);
 937                 goto error;
 938         }
 939         isl_token_free(tok);
 940         v = read_tuple(s, v);
 941         if (!v)
 942                 return NULL;
 943         n1 = v->n - nparam;
 944         tok = isl_stream_next_token(s);
 945         if (tok && tok->type == ISL_TOKEN_TO) {
 946                 isl_token_free(tok);
 947                 v = read_tuple(s, v);
 948                 if (!v)
 949                         return NULL;
 950                 n2 = v->n - n1 - nparam;
 951         } else {
 952                 if (tok)
 953                         isl_stream_push_token(s, tok);
 954                 n2 = n1;
 955                 n1 = 0;
 956         }
 957         dim = dim_from_vars(v, nparam, n1, n2);
 958         tok = isl_stream_next_token(s);
 959         if (!tok) {
 960                 isl_stream_error(s, NULL, "unexpected EOF");
 961                 goto error;
 962         }
 963         if (tok->type == ':') {
 964                 isl_token_free(tok);
 965                 map = read_disjuncts(s, v, isl_dim_copy(dim));
 966                 tok = isl_stream_next_token(s);
 967         } else
 968                 map = isl_map_universe(isl_dim_copy(dim));
 969         if (tok && tok->type == '}') {
 970                 isl_token_free(tok);
 971         } else {
 972                 isl_stream_error(s, tok, "unexpected isl_token");
 973                 if (tok)
 974                         isl_token_free(tok);
 975                 goto error;
 976         }
 977         vars_free(v);
 978         isl_dim_free(dim);
 979
 980         return map;
 981 error:
 982         isl_dim_free(dim);
 983         isl_map_free(map);
 984         if (v)
 985                 vars_free(v);
 986         return NULL;
 987 }
 988
 989 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
 990 {
 991         struct isl_map *map;
 992         struct isl_basic_map *bmap;
 993
 994         map = map_read(s, nparam);
 995         if (!map)
 996                 return NULL;
 997
 998         isl_assert(map->ctx, map->n <= 1, goto error);
 999
1000         if (map->n == 0)
1001                 bmap = isl_basic_map_empty_like_map(map);
1002         else
1003                 bmap = isl_basic_map_copy(map->p[0]);
1004
1005         isl_map_free(map);
1006
1007         return bmap;
1008 error:
1009         isl_map_free(map);
1010         return NULL;
1011 }
1012
1013 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
1014                 FILE *input, int nparam)
1015 {
1016         struct isl_basic_map *bmap;
1017         struct isl_stream *s = isl_stream_new_file(ctx, input);
1018         if (!s)
1019                 return NULL;
1020         bmap = basic_map_read(s, nparam);
1021         isl_stream_free(s);
1022         return bmap;
1023 }
1024
1025 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
1026                 FILE *input, int nparam)
1027 {
1028         struct isl_basic_map *bmap;
1029         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
1030         if (!bmap)
1031                 return NULL;
1032         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1033         return (struct isl_basic_set *)bmap;
1034 error:
1035         isl_basic_map_free(bmap);
1036         return NULL;
1037 }
1038
1039 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
1040                 const char *str, int nparam)
1041 {
1042         struct isl_basic_map *bmap;
1043         struct isl_stream *s = isl_stream_new_str(ctx, str);
1044         if (!s)
1045                 return NULL;
1046         bmap = basic_map_read(s, nparam);
1047         isl_stream_free(s);
1048         return bmap;
1049 }
1050
1051 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
1052                 const char *str, int nparam)
1053 {
1054         struct isl_basic_map *bmap;
1055         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
1056         if (!bmap)
1057                 return NULL;
1058         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1059         return (struct isl_basic_set *)bmap;
1060 error:
1061         isl_basic_map_free(bmap);
1062         return NULL;
1063 }
1064
1065 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
1066                 FILE *input, int nparam)
1067 {
1068         struct isl_map *map;
1069         struct isl_stream *s = isl_stream_new_file(ctx, input);
1070         if (!s)
1071                 return NULL;
1072         map = map_read(s, nparam);
1073         isl_stream_free(s);
1074         return map;
1075 }
1076
1077 __isl_give isl_map *isl_map_read_from_str(struct isl_ctx *ctx,
1078                 const char *str, int nparam)
1079 {
1080         struct isl_map *map;
1081         struct isl_stream *s = isl_stream_new_str(ctx, str);
1082         if (!s)
1083                 return NULL;
1084         map = map_read(s, nparam);
1085         isl_stream_free(s);
1086         return map;
1087 }
1088
1089 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
1090                 FILE *input, int nparam)
1091 {
1092         struct isl_map *map;
1093         map = isl_map_read_from_file(ctx, input, nparam);
1094         if (!map)
1095                 return NULL;
1096         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1097         return (struct isl_set *)map;
1098 error:
1099         isl_map_free(map);
1100         return NULL;
1101 }
1102
1103 struct isl_set *isl_set_read_from_str(struct isl_ctx *ctx,
1104                 const char *str, int nparam)
1105 {
1106         struct isl_map *map;
1107         map = isl_map_read_from_str(ctx, str, nparam);
1108         if (!map)
1109                 return NULL;
1110         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1111         return (struct isl_set *)map;
1112 error:
1113         isl_map_free(map);
1114         return NULL;
1115 }
1116
1117 static char *next_line(FILE *input, char *line, unsigned len)
1118 {
1119         char *p;
1120
1121         do {
1122                 if (!(p = fgets(line, len, input)))
1123                         return NULL;
1124                 while (isspace(*p) && *p != '\n')
1125                         ++p;
1126         } while (*p == '#' || *p == '\n');
1127
1128         return p;
1129 }
1130
1131 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
1132                 FILE *input)
1133 {
1134         struct isl_vec *vec = NULL;
1135         char line[1024];
1136         char val[1024];
1137         char *p;
1138         unsigned size;
1139         int j;
1140         int n;
1141         int offset;
1142
1143         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
1144         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
1145
1146         vec = isl_vec_alloc(ctx, size);
1147
1148         p = next_line(input, line, sizeof(line));
1149         isl_assert(ctx, p, goto error);
1150
1151         for (j = 0; j < size; ++j) {
1152                 n = sscanf(p, "%s%n", val, &offset);
1153                 isl_assert(ctx, n != 0, goto error);
1154                 isl_int_read(vec->el[j], val);
1155                 p += offset;
1156         }
1157
1158         return vec;
1159 error:
1160         isl_vec_free(vec);
1161         return NULL;
1162 }
1163
1164 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
1165                 FILE *input, unsigned input_format)
1166 {
1167         if (input_format == ISL_FORMAT_POLYLIB)
1168                 return isl_vec_read_from_file_polylib(ctx, input);
1169         else
1170                 isl_assert(ctx, 0, return NULL);
1171 }