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_div.h>
  20 #include "isl_stream.h"
  21 #include "isl_map_private.h"
  22 #include "isl_obj.h"
  23 #include "isl_polynomial_private.h"
  24 #include <isl_union_map.h>
  25
  26 struct variable {
  27         char                    *name;
  28         int                      pos;
  29         struct variable         *next;
  30 };
  31
  32 struct vars {
  33         struct isl_ctx  *ctx;
  34         int              n;
  35         struct variable *v;
  36 };
  37
  38 static struct vars *vars_new(struct isl_ctx *ctx)
  39 {
  40         struct vars *v;
  41         v = isl_alloc_type(ctx, struct vars);
  42         if (!v)
  43                 return NULL;
  44         v->ctx = ctx;
  45         v->n = 0;
  46         v->v = NULL;
  47         return v;
  48 }
  49
  50 static void variable_free(struct variable *var)
  51 {
  52         while (var) {
  53                 struct variable *next = var->next;
  54                 free(var->name);
  55                 free(var);
  56                 var = next;
  57         }
  58 }
  59
  60 static void vars_free(struct vars *v)
  61 {
  62         if (!v)
  63                 return;
  64         variable_free(v->v);
  65         free(v);
  66 }
  67
  68 static void vars_drop(struct vars *v, int n)
  69 {
  70         struct variable *var;
  71
  72         if (!v || !v->v)
  73                 return;
  74
  75         v->n -= n;
  76
  77         var = v->v;
  78         while (--n >= 0) {
  79                 struct variable *next = var->next;
  80                 free(var->name);
  81                 free(var);
  82                 var = next;
  83         }
  84         v->v = var;
  85 }
  86
  87 static struct variable *variable_new(struct vars *v, const char *name, int len,
  88                                 int pos)
  89 {
  90         struct variable *var;
  91         var = isl_alloc_type(v->ctx, struct variable);
  92         if (!var)
  93                 goto error;
  94         var->name = strdup(name);
  95         var->name[len] = '\0';
  96         var->pos = pos;
  97         var->next = v->v;
  98         return var;
  99 error:
 100         variable_free(v->v);
 101         return NULL;
 102 }
 103
 104 static int vars_pos(struct vars *v, const char *s, int len)
 105 {
 106         int pos;
 107         struct variable *q;
 108
 109         if (len == -1)
 110                 len = strlen(s);
 111         for (q = v->v; q; q = q->next) {
 112                 if (strncmp(q->name, s, len) == 0 && q->name[len] == '\0')
 113                         break;
 114         }
 115         if (q)
 116                 pos = q->pos;
 117         else {
 118                 pos = v->n;
 119                 v->v = variable_new(v, s, len, v->n);
 120                 if (!v->v)
 121                         return -1;
 122                 v->n++;
 123         }
 124         return pos;
 125 }
 126
 127 static __isl_give isl_dim *set_name(__isl_take isl_dim *dim,
 128         enum isl_dim_type type, unsigned pos, char *name)
 129 {
 130         char *prime;
 131
 132         if (!dim)
 133                 return NULL;
 134         if (!name)
 135                 return dim;
 136
 137         prime = strchr(name, '\'');
 138         if (prime)
 139                 *prime = '\0';
 140         dim = isl_dim_set_name(dim, type, pos, name);
 141         if (prime)
 142                 *prime = '\'';
 143
 144         return dim;
 145 }
 146
 147 static int accept_cst_factor(struct isl_stream *s, isl_int *f)
 148 {
 149         struct isl_token *tok;
 150
 151         tok = isl_stream_next_token(s);
 152         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 153                 isl_stream_error(s, tok, "expecting constant value");
 154                 goto error;
 155         }
 156
 157         isl_int_mul(*f, *f, tok->u.v);
 158
 159         isl_token_free(tok);
 160
 161         if (isl_stream_eat_if_available(s, '*'))
 162                 return accept_cst_factor(s, f);
 163
 164         return 0;
 165 error:
 166         isl_token_free(tok);
 167         return -1;
 168 }
 169
 170 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v);
 171
 172 static __isl_give isl_vec *accept_affine_factor(struct isl_stream *s,
 173         struct vars *v)
 174 {
 175         struct isl_token *tok = NULL;
 176         isl_vec *aff = NULL;
 177
 178         tok = isl_stream_next_token(s);
 179         if (!tok) {
 180                 isl_stream_error(s, NULL, "unexpected EOF");
 181                 goto error;
 182         }
 183         if (tok->type == ISL_TOKEN_IDENT) {
 184                 int n = v->n;
 185                 int pos = vars_pos(v, tok->u.s, -1);
 186                 if (pos < 0)
 187                         goto error;
 188                 if (pos >= n) {
 189                         isl_stream_error(s, tok, "unknown identifier");
 190                         goto error;
 191                 }
 192
 193                 aff = isl_vec_alloc(v->ctx, 1 + v->n);
 194                 if (!aff)
 195                         goto error;
 196                 isl_seq_clr(aff->el, aff->size);
 197                 isl_int_set_si(aff->el[1 + pos], 1);
 198                 isl_token_free(tok);
 199         } else if (tok->type == ISL_TOKEN_VALUE) {
 200                 if (isl_stream_eat_if_available(s, '*')) {
 201                         aff = accept_affine_factor(s, v);
 202                         aff = isl_vec_scale(aff, tok->u.v);
 203                 } else {
 204                         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 205                         if (!aff)
 206                                 goto error;
 207                         isl_seq_clr(aff->el, aff->size);
 208                         isl_int_set(aff->el[0], tok->u.v);
 209                 }
 210                 isl_token_free(tok);
 211         } else if (tok->type == '(') {
 212                 isl_token_free(tok);
 213                 tok = NULL;
 214                 aff = accept_affine(s, v);
 215                 if (!aff)
 216                         goto error;
 217                 if (isl_stream_eat(s, ')'))
 218                         goto error;
 219         } else {
 220                 isl_stream_error(s, tok, "expecting factor");
 221                 goto error;
 222         }
 223         if (isl_stream_eat_if_available(s, '*')) {
 224                 isl_int f;
 225                 isl_int_init(f);
 226                 isl_int_set_si(f, 1);
 227                 if (accept_cst_factor(s, &f) < 0) {
 228                         isl_int_clear(f);
 229                         goto error;
 230                 }
 231                 aff = isl_vec_scale(aff, f);
 232                 isl_int_clear(f);
 233         }
 234
 235         return aff;
 236 error:
 237         isl_token_free(tok);
 238         isl_vec_free(aff);
 239         return NULL;
 240 }
 241
 242 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v)
 243 {
 244         struct isl_token *tok = NULL;
 245         struct isl_vec *aff;
 246         int sign = 1;
 247
 248         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 249         if (!aff)
 250                 return NULL;
 251         isl_seq_clr(aff->el, aff->size);
 252
 253         for (;;) {
 254                 tok = isl_stream_next_token(s);
 255                 if (!tok) {
 256                         isl_stream_error(s, NULL, "unexpected EOF");
 257                         goto error;
 258                 }
 259                 if (tok->type == '-') {
 260                         sign = -sign;
 261                         isl_token_free(tok);
 262                         continue;
 263                 }
 264                 if (tok->type == '(' || tok->type == ISL_TOKEN_IDENT) {
 265                         isl_vec *aff2;
 266                         isl_stream_push_token(s, tok);
 267                         tok = NULL;
 268                         aff2 = accept_affine_factor(s, v);
 269                         if (sign < 0)
 270                                 aff2 = isl_vec_scale(aff2, s->ctx->negone);
 271                         aff = isl_vec_add(aff, aff2);
 272                         if (!aff)
 273                                 goto error;
 274                         sign = 1;
 275                 } else if (tok->type == ISL_TOKEN_VALUE) {
 276                         if (sign < 0)
 277                                 isl_int_neg(tok->u.v, tok->u.v);
 278                         if (isl_stream_eat_if_available(s, '*') ||
 279                             isl_stream_next_token_is(s, ISL_TOKEN_IDENT)) {
 280                                 isl_vec *aff2;
 281                                 aff2 = accept_affine_factor(s, v);
 282                                 aff2 = isl_vec_scale(aff2, tok->u.v);
 283                                 aff = isl_vec_add(aff, aff2);
 284                                 if (!aff)
 285                                         goto error;
 286                         } else {
 287                                 isl_int_add(aff->el[0], aff->el[0], tok->u.v);
 288                         }
 289                         sign = 1;
 290                 }
 291                 isl_token_free(tok);
 292
 293                 tok = isl_stream_next_token(s);
 294                 if (tok && tok->type == '-') {
 295                         sign = -sign;
 296                         isl_token_free(tok);
 297                 } else if (tok && tok->type == '+') {
 298                         /* nothing */
 299                         isl_token_free(tok);
 300                 } else if (tok && tok->type == ISL_TOKEN_VALUE &&
 301                            isl_int_is_neg(tok->u.v)) {
 302                         isl_stream_push_token(s, tok);
 303                 } else {
 304                         if (tok)
 305                                 isl_stream_push_token(s, tok);
 306                         break;
 307                 }
 308         }
 309
 310         return aff;
 311 error:
 312         isl_token_free(tok);
 313         isl_vec_free(aff);
 314         return NULL;
 315 }
 316
 317 static __isl_give isl_mat *read_var_def(struct isl_stream *s,
 318         __isl_take isl_mat *eq, enum isl_dim_type type, struct vars *v)
 319 {
 320         struct isl_vec *vec;
 321
 322         vec = accept_affine(s, v);
 323         if (!vec)
 324                 goto error;
 325         v->v = variable_new(v, "", 0, v->n);
 326         if (!v->v)
 327                 goto error;
 328         v->n++;
 329         eq = isl_mat_add_rows(eq, 1);
 330         if (eq) {
 331                 isl_seq_cpy(eq->row[eq->n_row - 1], vec->el, vec->size);
 332                 isl_int_set_si(eq->row[eq->n_row - 1][vec->size], -1);
 333         }
 334         isl_vec_free(vec);
 335
 336         return eq;
 337 error:
 338         isl_mat_free(eq);
 339         return NULL;
 340 }
 341
 342 static __isl_give isl_dim *read_var_list(struct isl_stream *s,
 343         __isl_take isl_dim *dim, enum isl_dim_type type, struct vars *v,
 344         __isl_keep isl_mat **eq)
 345 {
 346         int i = 0;
 347         struct isl_token *tok;
 348
 349         while ((tok = isl_stream_next_token(s)) != NULL) {
 350                 int new_name = 0;
 351
 352                 if (tok->type == ISL_TOKEN_IDENT) {
 353                         int n = v->n;
 354                         int p = vars_pos(v, tok->u.s, -1);
 355                         if (p < 0)
 356                                 goto error;
 357                         new_name = p >= n;
 358                 }
 359
 360                 if (new_name) {
 361                         dim = isl_dim_add(dim, type, 1);
 362                         if (eq)
 363                                 *eq = isl_mat_add_zero_cols(*eq, 1);
 364                         dim = set_name(dim, type, i, v->v->name);
 365                         isl_token_free(tok);
 366                 } else if (tok->type == ISL_TOKEN_IDENT ||
 367                            tok->type == ISL_TOKEN_VALUE) {
 368                         if (type == isl_dim_param) {
 369                                 isl_stream_error(s, tok,
 370                                                 "expecting unique identifier");
 371                                 goto error;
 372                         }
 373                         isl_stream_push_token(s, tok);
 374                         tok = NULL;
 375                         dim = isl_dim_add(dim, type, 1);
 376                         *eq = isl_mat_add_zero_cols(*eq, 1);
 377                         *eq = read_var_def(s, *eq, type, v);
 378                 } else
 379                         break;
 380
 381                 tok = isl_stream_next_token(s);
 382                 if (!tok || tok->type != ',')
 383                         break;
 384
 385                 isl_token_free(tok);
 386                 i++;
 387         }
 388         if (tok)
 389                 isl_stream_push_token(s, tok);
 390
 391         return dim;
 392 error:
 393         isl_token_free(tok);
 394         isl_dim_free(dim);
 395         return NULL;
 396 }
 397
 398 static __isl_give isl_mat *accept_affine_list(struct isl_stream *s,
 399         struct vars *v)
 400 {
 401         struct isl_vec *vec;
 402         struct isl_mat *mat;
 403         struct isl_token *tok = NULL;
 404
 405         vec = accept_affine(s, v);
 406         mat = isl_mat_from_row_vec(vec);
 407         if (!mat)
 408                 return NULL;
 409
 410         for (;;) {
 411                 tok = isl_stream_next_token(s);
 412                 if (!tok) {
 413                         isl_stream_error(s, NULL, "unexpected EOF");
 414                         goto error;
 415                 }
 416                 if (tok->type != ',') {
 417                         isl_stream_push_token(s, tok);
 418                         break;
 419                 }
 420                 isl_token_free(tok);
 421
 422                 vec = accept_affine(s, v);
 423                 mat = isl_mat_vec_concat(mat, vec);
 424                 if (!mat)
 425                         return NULL;
 426         }
 427
 428         return mat;
 429 error:
 430         isl_mat_free(mat);
 431         return NULL;
 432 }
 433
 434 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 435         struct vars *v, struct isl_basic_map *bmap, int k)
 436 {
 437         struct isl_token *tok;
 438         int seen_paren = 0;
 439         struct isl_vec *aff;
 440
 441         if (isl_stream_eat(s, '['))
 442                 goto error;
 443
 444         tok = isl_stream_next_token(s);
 445         if (!tok)
 446                 goto error;
 447         if (tok->type == '(') {
 448                 seen_paren = 1;
 449                 isl_token_free(tok);
 450         } else
 451                 isl_stream_push_token(s, tok);
 452
 453         aff = accept_affine(s, v);
 454         if (!aff)
 455                 goto error;
 456
 457         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 458
 459         isl_vec_free(aff);
 460
 461         if (seen_paren && isl_stream_eat(s, ')'))
 462                 goto error;
 463         if (isl_stream_eat(s, '/'))
 464                 goto error;
 465
 466         tok = isl_stream_next_token(s);
 467         if (!tok)
 468                 goto error;
 469         if (tok->type != ISL_TOKEN_VALUE) {
 470                 isl_stream_error(s, tok, "expected denominator");
 471                 isl_stream_push_token(s, tok);
 472                 goto error;
 473         }
 474         isl_int_set(bmap->div[k][0], tok->u.v);
 475         isl_token_free(tok);
 476
 477         if (isl_stream_eat(s, ']'))
 478                 goto error;
 479
 480         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 481                 goto error;
 482
 483         return bmap;
 484 error:
 485         isl_basic_map_free(bmap);
 486         return NULL;
 487 }
 488
 489 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 490         struct vars *v, struct isl_basic_map *bmap)
 491 {
 492         struct isl_token *tok;
 493
 494         while ((tok = isl_stream_next_token(s)) != NULL) {
 495                 int k;
 496                 int p;
 497                 int n = v->n;
 498                 unsigned total = isl_basic_map_total_dim(bmap);
 499
 500                 if (tok->type != ISL_TOKEN_IDENT)
 501                         break;
 502
 503                 p = vars_pos(v, tok->u.s, -1);
 504                 if (p < 0)
 505                         goto error;
 506                 if (p < n) {
 507                         isl_stream_error(s, tok, "expecting unique identifier");
 508                         goto error;
 509                 }
 510
 511                 bmap = isl_basic_map_cow(bmap);
 512                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 513                                                 1, 0, 2);
 514
 515                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 516                         goto error;
 517                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 518
 519                 isl_token_free(tok);
 520                 tok = isl_stream_next_token(s);
 521                 if (tok && tok->type == '=') {
 522                         isl_token_free(tok);
 523                         bmap = add_div_definition(s, v, bmap, k);
 524                         tok = isl_stream_next_token(s);
 525                 }
 526
 527                 if (!tok || tok->type != ',')
 528                         break;
 529
 530                 isl_token_free(tok);
 531         }
 532         if (tok)
 533                 isl_stream_push_token(s, tok);
 534
 535         return bmap;
 536 error:
 537         isl_token_free(tok);
 538         isl_basic_map_free(bmap);
 539         return NULL;
 540 }
 541
 542 static int next_is_tuple(struct isl_stream *s)
 543 {
 544         struct isl_token *tok;
 545         int is_tuple;
 546
 547         tok = isl_stream_next_token(s);
 548         if (!tok)
 549                 return 0;
 550         if (tok->type == '[') {
 551                 isl_stream_push_token(s, tok);
 552                 return 1;
 553         }
 554         if (tok->type != ISL_TOKEN_IDENT) {
 555                 isl_stream_push_token(s, tok);
 556                 return 0;
 557         }
 558
 559         is_tuple = isl_stream_next_token_is(s, '[');
 560
 561         isl_stream_push_token(s, tok);
 562
 563         return is_tuple;
 564 }
 565
 566 static __isl_give isl_dim *read_tuple(struct isl_stream *s,
 567         __isl_take isl_dim *dim, enum isl_dim_type type, struct vars *v,
 568         __isl_keep isl_mat **eq);
 569
 570 static __isl_give isl_dim *read_nested_tuple(struct isl_stream *s,
 571         __isl_take isl_dim *dim, struct vars *v, __isl_keep isl_mat **eq)
 572 {
 573         dim = read_tuple(s, dim, isl_dim_in, v, eq);
 574         if (isl_stream_eat(s, ISL_TOKEN_TO))
 575                 goto error;
 576         dim = read_tuple(s, dim, isl_dim_out, v, eq);
 577         dim = isl_dim_wrap(dim);
 578         return dim;
 579 error:
 580         isl_dim_free(dim);
 581         return NULL;
 582 }
 583
 584 static __isl_give isl_dim *read_tuple(struct isl_stream *s,
 585         __isl_take isl_dim *dim, enum isl_dim_type type, struct vars *v,
 586         __isl_keep isl_mat **eq)
 587 {
 588         struct isl_token *tok;
 589         char *name = NULL;
 590
 591         tok = isl_stream_next_token(s);
 592         if (tok && tok->type == ISL_TOKEN_IDENT) {
 593                 name = strdup(tok->u.s);
 594                 if (!name)
 595                         goto error;
 596                 isl_token_free(tok);
 597                 tok = isl_stream_next_token(s);
 598         }
 599         if (!tok || tok->type != '[') {
 600                 isl_stream_error(s, tok, "expecting '['");
 601                 goto error;
 602         }
 603         isl_token_free(tok);
 604         if (type != isl_dim_param && next_is_tuple(s)) {
 605                 isl_dim *nested = isl_dim_copy(dim);
 606                 nested = isl_dim_drop(nested, isl_dim_in, 0,
 607                                         isl_dim_size(nested, isl_dim_in));
 608                 nested = isl_dim_drop(nested, isl_dim_out, 0,
 609                                         isl_dim_size(nested, isl_dim_out));
 610                 nested = read_nested_tuple(s, nested, v, eq);
 611                 if (type == isl_dim_in) {
 612                         isl_dim_free(dim);
 613                         dim = isl_dim_reverse(nested);
 614                 } else {
 615                         dim = isl_dim_join(dim, nested);
 616                 }
 617         } else
 618                 dim = read_var_list(s, dim, type, v, eq);
 619         tok = isl_stream_next_token(s);
 620         if (!tok || tok->type != ']') {
 621                 isl_stream_error(s, tok, "expecting ']'");
 622                 goto error;
 623         }
 624         isl_token_free(tok);
 625
 626         if (name) {
 627                 dim = isl_dim_set_tuple_name(dim, type, name);
 628                 free(name);
 629         }
 630
 631         return dim;
 632 error:
 633         if (tok)
 634                 isl_token_free(tok);
 635         isl_dim_free(dim);
 636         return NULL;
 637 }
 638
 639 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 640         struct vars *v, struct isl_basic_map *bmap);
 641
 642 static struct isl_basic_map *add_exists(struct isl_stream *s,
 643         struct vars *v, struct isl_basic_map *bmap)
 644 {
 645         struct isl_token *tok;
 646         int n = v->n;
 647         int extra;
 648         int seen_paren = 0;
 649         int i;
 650         unsigned total;
 651
 652         tok = isl_stream_next_token(s);
 653         if (!tok)
 654                 goto error;
 655         if (tok->type == '(') {
 656                 seen_paren = 1;
 657                 isl_token_free(tok);
 658         } else
 659                 isl_stream_push_token(s, tok);
 660
 661         bmap = read_defined_var_list(s, v, bmap);
 662         if (!bmap)
 663                 goto error;
 664
 665         if (isl_stream_eat(s, ':'))
 666                 goto error;
 667         bmap = add_constraints(s, v, bmap);
 668         if (seen_paren && isl_stream_eat(s, ')'))
 669                 goto error;
 670         return bmap;
 671 error:
 672         isl_basic_map_free(bmap);
 673         return NULL;
 674 }
 675
 676 static __isl_give isl_basic_map *construct_constraint(
 677         __isl_take isl_basic_map *bmap, enum isl_token_type type,
 678         isl_int *left, isl_int *right)
 679 {
 680         int k;
 681         unsigned len;
 682         struct isl_ctx *ctx;
 683
 684         if (!bmap)
 685                 return NULL;
 686         len = 1 + isl_basic_map_total_dim(bmap);
 687         ctx = bmap->ctx;
 688
 689         k = isl_basic_map_alloc_inequality(bmap);
 690         if (k < 0)
 691                 goto error;
 692         if (type == ISL_TOKEN_LE)
 693                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 694                                                ctx->one, right,
 695                                                len);
 696         else if (type == ISL_TOKEN_GE)
 697                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 698                                                ctx->negone, right,
 699                                                len);
 700         else if (type == ISL_TOKEN_LT) {
 701                 isl_seq_combine(bmap->ineq[k], ctx->negone, left,
 702                                                ctx->one, right,
 703                                                len);
 704                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 705         } else if (type == ISL_TOKEN_GT) {
 706                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 707                                                ctx->negone, right,
 708                                                len);
 709                 isl_int_sub_ui(bmap->ineq[k][0], bmap->ineq[k][0], 1);
 710         } else {
 711                 isl_seq_combine(bmap->ineq[k], ctx->one, left,
 712                                                ctx->negone, right,
 713                                                len);
 714                 isl_basic_map_inequality_to_equality(bmap, k);
 715         }
 716
 717         return bmap;
 718 error:
 719         isl_basic_map_free(bmap);
 720         return NULL;
 721 }
 722
 723 static int is_comparator(struct isl_token *tok)
 724 {
 725         if (!tok)
 726                 return 0;
 727
 728         switch (tok->type) {
 729         case ISL_TOKEN_LT:
 730         case ISL_TOKEN_GT:
 731         case ISL_TOKEN_LE:
 732         case ISL_TOKEN_GE:
 733         case '=':
 734                 return 1;
 735         default:
 736                 return 0;
 737         }
 738 }
 739
 740 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 741         struct vars *v, struct isl_basic_map *bmap)
 742 {
 743         int i, j;
 744         unsigned total = isl_basic_map_total_dim(bmap);
 745         struct isl_token *tok = NULL;
 746         struct isl_mat *aff1 = NULL, *aff2 = NULL;
 747
 748         tok = isl_stream_next_token(s);
 749         if (!tok)
 750                 goto error;
 751         if (tok->type == ISL_TOKEN_EXISTS) {
 752                 isl_token_free(tok);
 753                 return add_exists(s, v, bmap);
 754         }
 755         isl_stream_push_token(s, tok);
 756         tok = NULL;
 757
 758         bmap = isl_basic_map_cow(bmap);
 759
 760         aff1 = accept_affine_list(s, v);
 761         if (!aff1)
 762                 goto error;
 763         tok = isl_stream_next_token(s);
 764         if (!is_comparator(tok)) {
 765                 isl_stream_error(s, tok, "missing operator");
 766                 if (tok)
 767                         isl_stream_push_token(s, tok);
 768                 tok = NULL;
 769                 goto error;
 770         }
 771         isl_assert(aff1->ctx, aff1->n_col == 1 + total, goto error);
 772         for (;;) {
 773                 aff2 = accept_affine_list(s, v);
 774                 if (!aff2)
 775                         goto error;
 776                 isl_assert(aff2->ctx, aff2->n_col == 1 + total, goto error);
 777
 778                 bmap = isl_basic_map_extend_constraints(bmap, 0,
 779                                                 aff1->n_row * aff2->n_row);
 780                 for (i = 0; i < aff1->n_row; ++i)
 781                         for (j = 0; j < aff2->n_row; ++j)
 782                                 bmap = construct_constraint(bmap, tok->type,
 783                                                     aff1->row[i], aff2->row[j]);
 784                 isl_token_free(tok);
 785                 isl_mat_free(aff1);
 786                 aff1 = aff2;
 787
 788                 tok = isl_stream_next_token(s);
 789                 if (!is_comparator(tok)) {
 790                         if (tok)
 791                                 isl_stream_push_token(s, tok);
 792                         break;
 793                 }
 794         }
 795         isl_mat_free(aff1);
 796
 797         return bmap;
 798 error:
 799         if (tok)
 800                 isl_token_free(tok);
 801         isl_mat_free(aff1);
 802         isl_mat_free(aff2);
 803         isl_basic_map_free(bmap);
 804         return NULL;
 805 }
 806
 807 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 808         struct vars *v, struct isl_basic_map *bmap)
 809 {
 810         struct isl_token *tok;
 811
 812         for (;;) {
 813                 bmap = add_constraint(s, v, bmap);
 814                 if (!bmap)
 815                         return NULL;
 816                 tok = isl_stream_next_token(s);
 817                 if (!tok) {
 818                         isl_stream_error(s, NULL, "unexpected EOF");
 819                         goto error;
 820                 }
 821                 if (tok->type != ISL_TOKEN_AND)
 822                         break;
 823                 isl_token_free(tok);
 824         }
 825         isl_stream_push_token(s, tok);
 826
 827         return bmap;
 828 error:
 829         if (tok)
 830                 isl_token_free(tok);
 831         isl_basic_map_free(bmap);
 832         return NULL;
 833 }
 834
 835 static struct isl_basic_map *read_disjunct(struct isl_stream *s,
 836         struct vars *v, __isl_take isl_dim *dim)
 837 {
 838         int seen_paren = 0;
 839         struct isl_token *tok;
 840         struct isl_basic_map *bmap;
 841
 842         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 843         if (!bmap)
 844                 return NULL;
 845
 846         tok = isl_stream_next_token(s);
 847         if (!tok)
 848                 goto error;
 849         if (tok->type == '(') {
 850                 seen_paren = 1;
 851                 isl_token_free(tok);
 852         } else
 853                 isl_stream_push_token(s, tok);
 854
 855         bmap = add_constraints(s, v, bmap);
 856         bmap = isl_basic_map_simplify(bmap);
 857         bmap = isl_basic_map_finalize(bmap);
 858
 859         if (seen_paren && isl_stream_eat(s, ')'))
 860                 goto error;
 861
 862         return bmap;
 863 error:
 864         isl_basic_map_free(bmap);
 865         return NULL;
 866 }
 867
 868 static struct isl_map *read_disjuncts(struct isl_stream *s,
 869         struct vars *v, __isl_take isl_dim *dim)
 870 {
 871         struct isl_token *tok;
 872         struct isl_map *map;
 873
 874         tok = isl_stream_next_token(s);
 875         if (!tok) {
 876                 isl_stream_error(s, NULL, "unexpected EOF");
 877                 goto error;
 878         }
 879         if (tok->type == '}') {
 880                 isl_stream_push_token(s, tok);
 881                 return isl_map_universe(dim);
 882         }
 883         isl_stream_push_token(s, tok);
 884
 885         map = isl_map_empty(isl_dim_copy(dim));
 886         for (;;) {
 887                 struct isl_basic_map *bmap;
 888                 int n = v->n;
 889
 890                 bmap = read_disjunct(s, v, isl_dim_copy(dim));
 891                 map = isl_map_union(map, isl_map_from_basic_map(bmap));
 892
 893                 vars_drop(v, v->n - n);
 894
 895                 tok = isl_stream_next_token(s);
 896                 if (!tok || tok->type != ISL_TOKEN_OR)
 897                         break;
 898                 isl_token_free(tok);
 899         }
 900         if (tok)
 901                 isl_stream_push_token(s, tok);
 902
 903         isl_dim_free(dim);
 904         return map;
 905 error:
 906         isl_dim_free(dim);
 907         return NULL;
 908 }
 909
 910 static int polylib_pos_to_isl_pos(__isl_keep isl_basic_map *bmap, int pos)
 911 {
 912         if (pos < isl_basic_map_dim(bmap, isl_dim_out))
 913                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 914                            isl_basic_map_dim(bmap, isl_dim_in) + pos;
 915         pos -= isl_basic_map_dim(bmap, isl_dim_out);
 916
 917         if (pos < isl_basic_map_dim(bmap, isl_dim_in))
 918                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) + pos;
 919         pos -= isl_basic_map_dim(bmap, isl_dim_in);
 920
 921         if (pos < isl_basic_map_dim(bmap, isl_dim_div))
 922                 return 1 + isl_basic_map_dim(bmap, isl_dim_param) +
 923                            isl_basic_map_dim(bmap, isl_dim_in) +
 924                            isl_basic_map_dim(bmap, isl_dim_out) + pos;
 925         pos -= isl_basic_map_dim(bmap, isl_dim_div);
 926
 927         if (pos < isl_basic_map_dim(bmap, isl_dim_param))
 928                 return 1 + pos;
 929
 930         return 0;
 931 }
 932
 933 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 934         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 935 {
 936         int j;
 937         struct isl_token *tok;
 938         int type;
 939         int k;
 940         isl_int *c;
 941         unsigned nparam;
 942         unsigned dim;
 943
 944         if (!bmap)
 945                 return NULL;
 946
 947         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 948         dim = isl_basic_map_dim(bmap, isl_dim_out);
 949
 950         tok = isl_stream_next_token(s);
 951         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 952                 isl_stream_error(s, tok, "expecting coefficient");
 953                 if (tok)
 954                         isl_stream_push_token(s, tok);
 955                 goto error;
 956         }
 957         if (!tok->on_new_line) {
 958                 isl_stream_error(s, tok, "coefficient should appear on new line");
 959                 isl_stream_push_token(s, tok);
 960                 goto error;
 961         }
 962
 963         type = isl_int_get_si(tok->u.v);
 964         isl_token_free(tok);
 965
 966         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 967         if (type == 0) {
 968                 k = isl_basic_map_alloc_equality(bmap);
 969                 c = bmap->eq[k];
 970         } else {
 971                 k = isl_basic_map_alloc_inequality(bmap);
 972                 c = bmap->ineq[k];
 973         }
 974         if (k < 0)
 975                 goto error;
 976
 977         for (j = 0; j < 1 + isl_basic_map_total_dim(bmap); ++j) {
 978                 int pos;
 979                 tok = isl_stream_next_token(s);
 980                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 981                         isl_stream_error(s, tok, "expecting coefficient");
 982                         if (tok)
 983                                 isl_stream_push_token(s, tok);
 984                         goto error;
 985                 }
 986                 if (tok->on_new_line) {
 987                         isl_stream_error(s, tok,
 988                                 "coefficient should not appear on new line");
 989                         isl_stream_push_token(s, tok);
 990                         goto error;
 991                 }
 992                 pos = polylib_pos_to_isl_pos(bmap, j);
 993                 isl_int_set(c[pos], tok->u.v);
 994                 isl_token_free(tok);
 995         }
 996
 997         return bmap;
 998 error:
 999         isl_basic_map_free(bmap);
1000         return NULL;
1001 }
1002
1003 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
1004         int nparam)
1005 {
1006         int i;
1007         struct isl_token *tok;
1008         struct isl_token *tok2;
1009         int n_row, n_col;
1010         int on_new_line;
1011         unsigned in = 0, out, local = 0;
1012         struct isl_basic_map *bmap = NULL;
1013
1014         if (nparam < 0)
1015                 nparam = 0;
1016
1017         tok = isl_stream_next_token(s);
1018         if (!tok) {
1019                 isl_stream_error(s, NULL, "unexpected EOF");
1020                 return NULL;
1021         }
1022         tok2 = isl_stream_next_token(s);
1023         if (!tok2) {
1024                 isl_token_free(tok);
1025                 isl_stream_error(s, NULL, "unexpected EOF");
1026                 return NULL;
1027         }
1028         n_row = isl_int_get_si(tok->u.v);
1029         n_col = isl_int_get_si(tok2->u.v);
1030         on_new_line = tok2->on_new_line;
1031         isl_token_free(tok2);
1032         isl_token_free(tok);
1033         isl_assert(s->ctx, !on_new_line, return NULL);
1034         isl_assert(s->ctx, n_row >= 0, return NULL);
1035         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
1036         tok = isl_stream_next_token_on_same_line(s);
1037         if (tok) {
1038                 if (tok->type != ISL_TOKEN_VALUE) {
1039                         isl_stream_error(s, tok,
1040                                     "expecting number of output dimensions");
1041                         isl_stream_push_token(s, tok);
1042                         goto error;
1043                 }
1044                 out = isl_int_get_si(tok->u.v);
1045                 isl_token_free(tok);
1046
1047                 tok = isl_stream_next_token_on_same_line(s);
1048                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
1049                         isl_stream_error(s, tok,
1050                                     "expecting number of input dimensions");
1051                         if (tok)
1052                                 isl_stream_push_token(s, tok);
1053                         goto error;
1054                 }
1055                 in = isl_int_get_si(tok->u.v);
1056                 isl_token_free(tok);
1057
1058                 tok = isl_stream_next_token_on_same_line(s);
1059                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
1060                         isl_stream_error(s, tok,
1061                                     "expecting number of existentials");
1062                         if (tok)
1063                                 isl_stream_push_token(s, tok);
1064                         goto error;
1065                 }
1066                 local = isl_int_get_si(tok->u.v);
1067                 isl_token_free(tok);
1068
1069                 tok = isl_stream_next_token_on_same_line(s);
1070                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
1071                         isl_stream_error(s, tok,
1072                                     "expecting number of parameters");
1073                         if (tok)
1074                                 isl_stream_push_token(s, tok);
1075                         goto error;
1076                 }
1077                 nparam = isl_int_get_si(tok->u.v);
1078                 isl_token_free(tok);
1079                 if (n_col != 1 + out + in + local + nparam + 1) {
1080                         isl_stream_error(s, NULL,
1081                                     "dimensions don't match");
1082                         goto error;
1083                 }
1084         } else
1085                 out = n_col - 2 - nparam;
1086         bmap = isl_basic_map_alloc(s->ctx, nparam, in, out, local, n_row, n_row);
1087         if (!bmap)
1088                 return NULL;
1089
1090         for (i = 0; i < local; ++i) {
1091                 int k = isl_basic_map_alloc_div(bmap);
1092                 if (k < 0)
1093                         goto error;
1094         }
1095
1096         for (i = 0; i < n_row; ++i)
1097                 bmap = basic_map_read_polylib_constraint(s, bmap);
1098
1099         tok = isl_stream_next_token_on_same_line(s);
1100         if (tok) {
1101                 isl_stream_error(s, tok, "unexpected extra token on line");
1102                 isl_stream_push_token(s, tok);
1103                 goto error;
1104         }
1105
1106         bmap = isl_basic_map_simplify(bmap);
1107         bmap = isl_basic_map_finalize(bmap);
1108         return bmap;
1109 error:
1110         isl_basic_map_free(bmap);
1111         return NULL;
1112 }
1113
1114 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
1115 {
1116         struct isl_token *tok;
1117         struct isl_token *tok2;
1118         int i, n;
1119         struct isl_map *map;
1120
1121         tok = isl_stream_next_token(s);
1122         if (!tok) {
1123                 isl_stream_error(s, NULL, "unexpected EOF");
1124                 return NULL;
1125         }
1126         tok2 = isl_stream_next_token_on_same_line(s);
1127         if (tok2) {
1128                 isl_stream_push_token(s, tok2);
1129                 isl_stream_push_token(s, tok);
1130                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
1131         }
1132         n = isl_int_get_si(tok->u.v);
1133         isl_token_free(tok);
1134
1135         isl_assert(s->ctx, n >= 1, return NULL);
1136
1137         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
1138
1139         for (i = 1; i < n; ++i)
1140                 map = isl_map_union(map,
1141                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
1142
1143         return map;
1144 }
1145
1146 static int optional_power(struct isl_stream *s)
1147 {
1148         int pow;
1149         struct isl_token *tok;
1150
1151         tok = isl_stream_next_token(s);
1152         if (!tok)
1153                 return 1;
1154         if (tok->type != '^') {
1155                 isl_stream_push_token(s, tok);
1156                 return 1;
1157         }
1158         isl_token_free(tok);
1159         tok = isl_stream_next_token(s);
1160         if (!tok || tok->type != ISL_TOKEN_VALUE) {
1161                 isl_stream_error(s, tok, "expecting exponent");
1162                 if (tok)
1163                         isl_stream_push_token(s, tok);
1164                 return 1;
1165         }
1166         pow = isl_int_get_si(tok->u.v);
1167         isl_token_free(tok);
1168         return pow;
1169 }
1170
1171 static __isl_give isl_div *read_div(struct isl_stream *s,
1172         __isl_keep isl_basic_map *bmap, struct vars *v)
1173 {
1174         unsigned total = isl_basic_map_total_dim(bmap);
1175         int k;
1176
1177         bmap = isl_basic_map_copy(bmap);
1178         bmap = isl_basic_map_cow(bmap);
1179         bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
1180                                         1, 0, 2);
1181
1182         if ((k = isl_basic_map_alloc_div(bmap)) < 0)
1183                 goto error;
1184         isl_seq_clr(bmap->div[k], 1 + 1 + total);
1185         bmap = add_div_definition(s, v, bmap, k);
1186
1187         return isl_basic_map_div(bmap, k);
1188 error:
1189         isl_basic_map_free(bmap);
1190         return NULL;
1191 }
1192
1193 static __isl_give isl_qpolynomial *read_term(struct isl_stream *s,
1194         __isl_keep isl_basic_map *bmap, struct vars *v);
1195
1196 static __isl_give isl_qpolynomial *read_factor(struct isl_stream *s,
1197         __isl_keep isl_basic_map *bmap, struct vars *v)
1198 {
1199         struct isl_qpolynomial *qp;
1200         struct isl_token *tok;
1201
1202         tok = isl_stream_next_token(s);
1203         if (!tok) {
1204                 isl_stream_error(s, NULL, "unexpected EOF");
1205                 return NULL;
1206         }
1207         if (tok->type == '(') {
1208                 isl_token_free(tok);
1209                 qp = read_term(s, bmap, v);
1210                 if (!qp)
1211                         return NULL;
1212                 if (isl_stream_eat(s, ')'))
1213                         goto error;
1214         } else if (tok->type == ISL_TOKEN_VALUE) {
1215                 struct isl_token *tok2;
1216                 tok2 = isl_stream_next_token(s);
1217                 if (tok2 && tok2->type == '/') {
1218                         isl_token_free(tok2);
1219                         tok2 = isl_stream_next_token(s);
1220                         if (!tok2 || tok2->type != ISL_TOKEN_VALUE) {
1221                                 isl_stream_error(s, tok2, "expected denominator");
1222                                 isl_token_free(tok);
1223                                 isl_token_free(tok2);
1224                                 return NULL;
1225                         }
1226                         qp = isl_qpolynomial_rat_cst(isl_basic_map_get_dim(bmap),
1227                                                     tok->u.v, tok2->u.v);
1228                         isl_token_free(tok2);
1229                 } else {
1230                         isl_stream_push_token(s, tok2);
1231                         qp = isl_qpolynomial_cst(isl_basic_map_get_dim(bmap),
1232                                                 tok->u.v);
1233                 }
1234                 isl_token_free(tok);
1235         } else if (tok->type == ISL_TOKEN_INFTY) {
1236                 isl_token_free(tok);
1237                 qp = isl_qpolynomial_infty(isl_basic_map_get_dim(bmap));
1238         } else if (tok->type == ISL_TOKEN_NAN) {
1239                 isl_token_free(tok);
1240                 qp = isl_qpolynomial_nan(isl_basic_map_get_dim(bmap));
1241         } else if (tok->type == ISL_TOKEN_IDENT) {
1242                 int n = v->n;
1243                 int pos = vars_pos(v, tok->u.s, -1);
1244                 int pow;
1245                 isl_token_free(tok);
1246                 if (pos < 0)
1247                         goto error;
1248                 if (pos >= n) {
1249                         isl_stream_error(s, tok, "unknown identifier");
1250                         return NULL;
1251                 }
1252                 pow = optional_power(s);
1253                 qp = isl_qpolynomial_pow(isl_basic_map_get_dim(bmap), pos, pow);
1254         } else if (tok->type == '[') {
1255                 isl_div *div;
1256                 int pow;
1257
1258                 isl_stream_push_token(s, tok);
1259                 div = read_div(s, bmap, v);
1260                 pow = optional_power(s);
1261                 qp = isl_qpolynomial_div_pow(div, pow);
1262         } else if (tok->type == '-') {
1263                 struct isl_qpolynomial *qp2;
1264
1265                 isl_token_free(tok);
1266                 qp = isl_qpolynomial_cst(isl_basic_map_get_dim(bmap),
1267                                             s->ctx->negone);
1268                 qp2 = read_factor(s, bmap, v);
1269                 qp = isl_qpolynomial_mul(qp, qp2);
1270         } else {
1271                 isl_stream_error(s, tok, "unexpected isl_token");
1272                 isl_stream_push_token(s, tok);
1273                 return NULL;
1274         }
1275
1276         if (isl_stream_eat_if_available(s, '*') ||
1277             isl_stream_next_token_is(s, ISL_TOKEN_IDENT)) {
1278                 struct isl_qpolynomial *qp2;
1279
1280                 qp2 = read_factor(s, bmap, v);
1281                 qp = isl_qpolynomial_mul(qp, qp2);
1282         }
1283
1284         return qp;
1285 error:
1286         isl_qpolynomial_free(qp);
1287         return NULL;
1288 }
1289
1290 static __isl_give isl_qpolynomial *read_term(struct isl_stream *s,
1291         __isl_keep isl_basic_map *bmap, struct vars *v)
1292 {
1293         struct isl_token *tok;
1294         struct isl_qpolynomial *qp;
1295
1296         qp = read_factor(s, bmap, v);
1297
1298         for (;;) {
1299                 tok = isl_stream_next_token(s);
1300                 if (!tok)
1301                         return qp;
1302
1303                 if (tok->type == '+') {
1304                         struct isl_qpolynomial *qp2;
1305
1306                         isl_token_free(tok);
1307                         qp2 = read_factor(s, bmap, v);
1308                         qp = isl_qpolynomial_add(qp, qp2);
1309                 } else if (tok->type == '-') {
1310                         struct isl_qpolynomial *qp2;
1311
1312                         isl_token_free(tok);
1313                         qp2 = read_factor(s, bmap, v);
1314                         qp = isl_qpolynomial_sub(qp, qp2);
1315                 } else if (tok->type == ISL_TOKEN_VALUE &&
1316                             isl_int_is_neg(tok->u.v)) {
1317                         struct isl_qpolynomial *qp2;
1318
1319                         qp2 = isl_qpolynomial_cst(isl_basic_map_get_dim(bmap),
1320                                                         tok->u.v);
1321                         isl_token_free(tok);
1322                         qp = isl_qpolynomial_add(qp, qp2);
1323                 } else {
1324                         isl_stream_push_token(s, tok);
1325                         break;
1326                 }
1327         }
1328
1329         return qp;
1330 }
1331
1332 static __isl_give isl_map *read_optional_disjuncts(struct isl_stream *s,
1333         __isl_take isl_basic_map *bmap, struct vars *v)
1334 {
1335         struct isl_token *tok;
1336         struct isl_map *map;
1337
1338         tok = isl_stream_next_token(s);
1339         if (!tok) {
1340                 isl_stream_error(s, NULL, "unexpected EOF");
1341                 goto error;
1342         }
1343         map = isl_map_from_basic_map(isl_basic_map_copy(bmap));
1344         if (tok->type == ':') {
1345                 isl_token_free(tok);
1346                 map = isl_map_intersect(map,
1347                             read_disjuncts(s, v, isl_basic_map_get_dim(bmap)));
1348         } else
1349                 isl_stream_push_token(s, tok);
1350
1351         isl_basic_map_free(bmap);
1352
1353         return map;
1354 error:
1355         isl_basic_map_free(bmap);
1356         return NULL;
1357 }
1358
1359 static struct isl_obj obj_read_poly(struct isl_stream *s,
1360         __isl_take isl_basic_map *bmap, struct vars *v, int n)
1361 {
1362         struct isl_obj obj = { isl_obj_pw_qpolynomial, NULL };
1363         struct isl_pw_qpolynomial *pwqp;
1364         struct isl_qpolynomial *qp;
1365         struct isl_map *map;
1366         struct isl_set *set;
1367
1368         bmap = isl_basic_map_reverse(bmap);
1369
1370         qp = read_term(s, bmap, v);
1371         map = read_optional_disjuncts(s, bmap, v);
1372         set = isl_map_range(map);
1373
1374         pwqp = isl_pw_qpolynomial_alloc(set, qp);
1375
1376         vars_drop(v, v->n - n);
1377
1378         obj.v = pwqp;
1379         return obj;
1380 }
1381
1382 static __isl_give isl_basic_map *add_equalities(__isl_take isl_basic_map *bmap,
1383         isl_mat *eq)
1384 {
1385         int i, k;
1386         unsigned total = 1 + isl_basic_map_total_dim(bmap);
1387
1388         if (!bmap || !eq)
1389                 goto error;
1390
1391         bmap = isl_basic_map_extend_constraints(bmap, eq->n_row, 0);
1392
1393         for (i = 0; i < eq->n_row; ++i) {
1394                 k = isl_basic_map_alloc_equality(bmap);
1395                 if (k < 0)
1396                         goto error;
1397                 isl_seq_cpy(bmap->eq[k], eq->row[i], eq->n_col);
1398                 isl_seq_clr(bmap->eq[k] + eq->n_col, total - eq->n_col);
1399         }
1400
1401         isl_mat_free(eq);
1402         return bmap;
1403 error:
1404         isl_mat_free(eq);
1405         isl_basic_map_free(bmap);
1406         return NULL;
1407 }
1408
1409 static struct isl_obj obj_read_body(struct isl_stream *s,
1410         __isl_take isl_dim *dim, struct vars *v)
1411 {
1412         struct isl_map *map = NULL;
1413         struct isl_token *tok;
1414         struct isl_obj obj = { isl_obj_set, NULL };
1415         int n = v->n;
1416         isl_mat *eq = NULL;
1417         isl_basic_map *bmap;
1418
1419         if (!next_is_tuple(s)) {
1420                 bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
1421                 return obj_read_poly(s, bmap, v, n);
1422         }
1423
1424         eq = isl_mat_alloc(s->ctx, 0, 1 + n);
1425
1426         dim = read_tuple(s, dim, isl_dim_in, v, &eq);
1427         if (!dim)
1428                 goto error;
1429         tok = isl_stream_next_token(s);
1430         if (tok && tok->type == ISL_TOKEN_TO) {
1431                 obj.type = isl_obj_map;
1432                 isl_token_free(tok);
1433                 if (!next_is_tuple(s)) {
1434                         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
1435                         bmap = add_equalities(bmap, eq);
1436                         return obj_read_poly(s, bmap, v, n);
1437                 }
1438                 dim = read_tuple(s, dim, isl_dim_out, v, &eq);
1439                 if (!dim)
1440                         goto error;
1441         } else {
1442                 dim = isl_dim_reverse(dim);
1443                 if (tok)
1444                         isl_stream_push_token(s, tok);
1445         }
1446
1447         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
1448         bmap = add_equalities(bmap, eq);
1449
1450         map = read_optional_disjuncts(s, bmap, v);
1451
1452         vars_drop(v, v->n - n);
1453
1454         obj.v = map;
1455         return obj;
1456 error:
1457         isl_mat_free(eq);
1458         isl_dim_free(dim);
1459         obj.type = isl_obj_none;
1460         return obj;
1461 }
1462
1463 static struct isl_obj to_union(isl_ctx *ctx, struct isl_obj obj)
1464 {
1465         if (obj.type == isl_obj_map) {
1466                 obj.v = isl_union_map_from_map(obj.v);
1467                 obj.type = isl_obj_union_map;
1468         } else if (obj.type == isl_obj_set) {
1469                 obj.v = isl_union_set_from_set(obj.v);
1470                 obj.type = isl_obj_union_set;
1471         } else if (obj.type == isl_obj_pw_qpolynomial) {
1472                 obj.v = isl_union_pw_qpolynomial_from_pw_qpolynomial(obj.v);
1473                 obj.type = isl_obj_union_pw_qpolynomial;
1474         } else if (obj.type == isl_obj_pw_qpolynomial_fold) {
1475                 obj.v = isl_union_pw_qpolynomial_fold_from_pw_qpolynomial_fold(obj.v);
1476                 obj.type = isl_obj_union_pw_qpolynomial_fold;
1477         } else
1478                 isl_assert(ctx, 0, goto error);
1479         return obj;
1480 error:
1481         obj.type->free(obj.v);
1482         obj.type = isl_obj_none;
1483         return obj;
1484 }
1485
1486 static struct isl_obj obj_add(struct isl_ctx *ctx,
1487         struct isl_obj obj1, struct isl_obj obj2)
1488 {
1489         if (obj1.type == isl_obj_set && obj2.type == isl_obj_union_set)
1490                 obj1 = to_union(ctx, obj1);
1491         if (obj1.type == isl_obj_union_set && obj2.type == isl_obj_set)
1492                 obj2 = to_union(ctx, obj2);
1493         if (obj1.type == isl_obj_map && obj2.type == isl_obj_union_map)
1494                 obj1 = to_union(ctx, obj1);
1495         if (obj1.type == isl_obj_union_map && obj2.type == isl_obj_map)
1496                 obj2 = to_union(ctx, obj2);
1497         if (obj1.type == isl_obj_pw_qpolynomial &&
1498             obj2.type == isl_obj_union_pw_qpolynomial)
1499                 obj1 = to_union(ctx, obj1);
1500         if (obj1.type == isl_obj_union_pw_qpolynomial &&
1501             obj2.type == isl_obj_pw_qpolynomial)
1502                 obj2 = to_union(ctx, obj2);
1503         if (obj1.type == isl_obj_pw_qpolynomial_fold &&
1504             obj2.type == isl_obj_union_pw_qpolynomial_fold)
1505                 obj1 = to_union(ctx, obj1);
1506         if (obj1.type == isl_obj_union_pw_qpolynomial_fold &&
1507             obj2.type == isl_obj_pw_qpolynomial_fold)
1508                 obj2 = to_union(ctx, obj2);
1509         isl_assert(ctx, obj1.type == obj2.type, goto error);
1510         if (obj1.type == isl_obj_map && !isl_map_has_equal_dim(obj1.v, obj2.v)) {
1511                 obj1 = to_union(ctx, obj1);
1512                 obj2 = to_union(ctx, obj2);
1513         }
1514         if (obj1.type == isl_obj_set && !isl_set_has_equal_dim(obj1.v, obj2.v)) {
1515                 obj1 = to_union(ctx, obj1);
1516                 obj2 = to_union(ctx, obj2);
1517         }
1518         if (obj1.type == isl_obj_pw_qpolynomial &&
1519             !isl_pw_qpolynomial_has_equal_dim(obj1.v, obj2.v)) {
1520                 obj1 = to_union(ctx, obj1);
1521                 obj2 = to_union(ctx, obj2);
1522         }
1523         if (obj1.type == isl_obj_pw_qpolynomial_fold &&
1524             !isl_pw_qpolynomial_fold_has_equal_dim(obj1.v, obj2.v)) {
1525                 obj1 = to_union(ctx, obj1);
1526                 obj2 = to_union(ctx, obj2);
1527         }
1528         obj1.v = obj1.type->add(obj1.v, obj2.v);
1529         return obj1;
1530 error:
1531         obj1.type->free(obj1.v);
1532         obj2.type->free(obj2.v);
1533         obj1.type = isl_obj_none;
1534         obj1.v = NULL;
1535         return obj1;
1536 }
1537
1538 static struct isl_obj obj_read(struct isl_stream *s, int nparam)
1539 {
1540         isl_dim *dim = NULL;
1541         struct isl_token *tok;
1542         struct vars *v = NULL;
1543         struct isl_obj obj = { isl_obj_set, NULL };
1544
1545         tok = isl_stream_next_token(s);
1546         if (!tok) {
1547                 isl_stream_error(s, NULL, "unexpected EOF");
1548                 goto error;
1549         }
1550         if (tok->type == ISL_TOKEN_VALUE) {
1551                 struct isl_map *map;
1552                 isl_stream_push_token(s, tok);
1553                 map = map_read_polylib(s, nparam);
1554                 if (!map)
1555                         goto error;
1556                 if (isl_map_dim(map, isl_dim_in) > 0)
1557                         obj.type = isl_obj_map;
1558                 obj.v = map;
1559                 return obj;
1560         }
1561         v = vars_new(s->ctx);
1562         if (!v) {
1563                 isl_stream_push_token(s, tok);
1564                 goto error;
1565         }
1566         dim = isl_dim_alloc(s->ctx, 0, 0, 0);
1567         if (tok->type == '[') {
1568                 isl_stream_push_token(s, tok);
1569                 dim = read_tuple(s, dim, isl_dim_param, v, NULL);
1570                 if (!dim)
1571                         goto error;
1572                 if (nparam >= 0)
1573                         isl_assert(s->ctx, nparam == v->n, goto error);
1574                 tok = isl_stream_next_token(s);
1575                 if (!tok || tok->type != ISL_TOKEN_TO) {
1576                         isl_stream_error(s, tok, "expecting '->'");
1577                         if (tok)
1578                                 isl_stream_push_token(s, tok);
1579                         goto error;
1580                 }
1581                 isl_token_free(tok);
1582                 tok = isl_stream_next_token(s);
1583         } else if (nparam > 0)
1584                 dim = isl_dim_add(dim, isl_dim_param, nparam);
1585         if (!tok || tok->type != '{') {
1586                 isl_stream_error(s, tok, "expecting '{'");
1587                 if (tok)
1588                         isl_stream_push_token(s, tok);
1589                 goto error;
1590         }
1591         isl_token_free(tok);
1592
1593         tok = isl_stream_next_token(s);
1594         if (!tok)
1595                 ;
1596         else if (tok->type == ISL_TOKEN_IDENT && !strcmp(tok->u.s, "Sym")) {
1597                 isl_token_free(tok);
1598                 if (isl_stream_eat(s, '='))
1599                         goto error;
1600                 dim = read_tuple(s, dim, isl_dim_param, v, NULL);
1601                 if (!dim)
1602                         goto error;
1603                 if (nparam >= 0)
1604                         isl_assert(s->ctx, nparam == v->n, goto error);
1605         } else if (tok->type == '}') {
1606                 obj.type = isl_obj_union_set;
1607                 obj.v = isl_union_set_empty(isl_dim_copy(dim));
1608                 isl_token_free(tok);
1609                 goto done;
1610         } else
1611                 isl_stream_push_token(s, tok);
1612
1613         for (;;) {
1614                 struct isl_obj o;
1615                 tok = NULL;
1616                 o = obj_read_body(s, isl_dim_copy(dim), v);
1617                 if (o.type == isl_obj_none)
1618                         break;
1619                 if (!obj.v)
1620                         obj = o;
1621                 else {
1622                         obj = obj_add(s->ctx, obj, o);
1623                         if (obj.type == isl_obj_none)
1624                                 break;
1625                 }
1626                 tok = isl_stream_next_token(s);
1627                 if (!tok || tok->type != ';')
1628                         break;
1629                 isl_token_free(tok);
1630         }
1631
1632         if (tok && tok->type == '}') {
1633                 isl_token_free(tok);
1634         } else {
1635                 isl_stream_error(s, tok, "unexpected isl_token");
1636                 if (tok)
1637                         isl_token_free(tok);
1638                 goto error;
1639         }
1640 done:
1641         vars_free(v);
1642         isl_dim_free(dim);
1643
1644         return obj;
1645 error:
1646         isl_dim_free(dim);
1647         obj.type->free(obj.v);
1648         if (v)
1649                 vars_free(v);
1650         obj.v = NULL;
1651         return obj;
1652 }
1653
1654 struct isl_obj isl_stream_read_obj(struct isl_stream *s)
1655 {
1656         return obj_read(s, -1);
1657 }
1658
1659 __isl_give isl_map *isl_stream_read_map(struct isl_stream *s, int nparam)
1660 {
1661         struct isl_obj obj;
1662         struct isl_map *map;
1663
1664         obj = obj_read(s, nparam);
1665         if (obj.v)
1666                 isl_assert(s->ctx, obj.type == isl_obj_map ||
1667                                    obj.type == isl_obj_set, goto error);
1668
1669         return obj.v;
1670 error:
1671         obj.type->free(obj.v);
1672         return NULL;
1673 }
1674
1675 __isl_give isl_set *isl_stream_read_set(struct isl_stream *s, int nparam)
1676 {
1677         struct isl_obj obj;
1678         struct isl_set *set;
1679
1680         obj = obj_read(s, nparam);
1681         if (obj.v)
1682                 isl_assert(s->ctx, obj.type == isl_obj_set, goto error);
1683
1684         return obj.v;
1685 error:
1686         obj.type->free(obj.v);
1687         return NULL;
1688 }
1689
1690 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
1691 {
1692         struct isl_obj obj;
1693         struct isl_map *map;
1694         struct isl_basic_map *bmap;
1695
1696         obj = obj_read(s, nparam);
1697         map = obj.v;
1698         if (!map)
1699                 return NULL;
1700
1701         isl_assert(map->ctx, map->n <= 1, goto error);
1702
1703         if (map->n == 0)
1704                 bmap = isl_basic_map_empty_like_map(map);
1705         else
1706                 bmap = isl_basic_map_copy(map->p[0]);
1707
1708         isl_map_free(map);
1709
1710         return bmap;
1711 error:
1712         isl_map_free(map);
1713         return NULL;
1714 }
1715
1716 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
1717                 FILE *input, int nparam)
1718 {
1719         struct isl_basic_map *bmap;
1720         struct isl_stream *s = isl_stream_new_file(ctx, input);
1721         if (!s)
1722                 return NULL;
1723         bmap = basic_map_read(s, nparam);
1724         isl_stream_free(s);
1725         return bmap;
1726 }
1727
1728 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
1729                 FILE *input, int nparam)
1730 {
1731         struct isl_basic_map *bmap;
1732         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
1733         if (!bmap)
1734                 return NULL;
1735         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1736         return (struct isl_basic_set *)bmap;
1737 error:
1738         isl_basic_map_free(bmap);
1739         return NULL;
1740 }
1741
1742 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
1743                 const char *str, int nparam)
1744 {
1745         struct isl_basic_map *bmap;
1746         struct isl_stream *s = isl_stream_new_str(ctx, str);
1747         if (!s)
1748                 return NULL;
1749         bmap = basic_map_read(s, nparam);
1750         isl_stream_free(s);
1751         return bmap;
1752 }
1753
1754 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
1755                 const char *str, int nparam)
1756 {
1757         struct isl_basic_map *bmap;
1758         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
1759         if (!bmap)
1760                 return NULL;
1761         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
1762         return (struct isl_basic_set *)bmap;
1763 error:
1764         isl_basic_map_free(bmap);
1765         return NULL;
1766 }
1767
1768 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
1769                 FILE *input, int nparam)
1770 {
1771         struct isl_map *map;
1772         struct isl_stream *s = isl_stream_new_file(ctx, input);
1773         if (!s)
1774                 return NULL;
1775         map = isl_stream_read_map(s, nparam);
1776         isl_stream_free(s);
1777         return map;
1778 }
1779
1780 __isl_give isl_map *isl_map_read_from_str(struct isl_ctx *ctx,
1781                 const char *str, int nparam)
1782 {
1783         struct isl_map *map;
1784         struct isl_stream *s = isl_stream_new_str(ctx, str);
1785         if (!s)
1786                 return NULL;
1787         map = isl_stream_read_map(s, nparam);
1788         isl_stream_free(s);
1789         return map;
1790 }
1791
1792 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
1793                 FILE *input, int nparam)
1794 {
1795         struct isl_map *map;
1796         map = isl_map_read_from_file(ctx, input, nparam);
1797         if (!map)
1798                 return NULL;
1799         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1800         return (struct isl_set *)map;
1801 error:
1802         isl_map_free(map);
1803         return NULL;
1804 }
1805
1806 struct isl_set *isl_set_read_from_str(struct isl_ctx *ctx,
1807                 const char *str, int nparam)
1808 {
1809         struct isl_map *map;
1810         map = isl_map_read_from_str(ctx, str, nparam);
1811         if (!map)
1812                 return NULL;
1813         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
1814         return (struct isl_set *)map;
1815 error:
1816         isl_map_free(map);
1817         return NULL;
1818 }
1819
1820 static char *next_line(FILE *input, char *line, unsigned len)
1821 {
1822         char *p;
1823
1824         do {
1825                 if (!(p = fgets(line, len, input)))
1826                         return NULL;
1827                 while (isspace(*p) && *p != '\n')
1828                         ++p;
1829         } while (*p == '#' || *p == '\n');
1830
1831         return p;
1832 }
1833
1834 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
1835                 FILE *input)
1836 {
1837         struct isl_vec *vec = NULL;
1838         char line[1024];
1839         char val[1024];
1840         char *p;
1841         unsigned size;
1842         int j;
1843         int n;
1844         int offset;
1845
1846         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
1847         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
1848
1849         vec = isl_vec_alloc(ctx, size);
1850
1851         p = next_line(input, line, sizeof(line));
1852         isl_assert(ctx, p, goto error);
1853
1854         for (j = 0; j < size; ++j) {
1855                 n = sscanf(p, "%s%n", val, &offset);
1856                 isl_assert(ctx, n != 0, goto error);
1857                 isl_int_read(vec->el[j], val);
1858                 p += offset;
1859         }
1860
1861         return vec;
1862 error:
1863         isl_vec_free(vec);
1864         return NULL;
1865 }
1866
1867 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
1868                 FILE *input, unsigned input_format)
1869 {
1870         if (input_format == ISL_FORMAT_POLYLIB)
1871                 return isl_vec_read_from_file_polylib(ctx, input);
1872         else
1873                 isl_assert(ctx, 0, return NULL);
1874 }
1875
1876 __isl_give isl_pw_qpolynomial *isl_stream_read_pw_qpolynomial(
1877         struct isl_stream *s)
1878 {
1879         struct isl_obj obj;
1880         struct isl_pw_qpolynomial *pwqp;
1881
1882         obj = obj_read(s, -1);
1883         if (obj.v)
1884                 isl_assert(s->ctx, obj.type == isl_obj_pw_qpolynomial,
1885                            goto error);
1886
1887         return obj.v;
1888 error:
1889         obj.type->free(obj.v);
1890         return NULL;
1891 }
1892
1893 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_read_from_str(isl_ctx *ctx,
1894                 const char *str)
1895 {
1896         isl_pw_qpolynomial *pwqp;
1897         struct isl_stream *s = isl_stream_new_str(ctx, str);
1898         if (!s)
1899                 return NULL;
1900         pwqp = isl_stream_read_pw_qpolynomial(s);
1901         isl_stream_free(s);
1902         return pwqp;
1903 }