parse.c

   1 /*
   2  * Copyright 2011 Leiden University. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *    1. Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *
  11  *    2. Redistributions in binary form must reproduce the above
  12  *       copyright notice, this list of conditions and the following
  13  *       disclaimer in the documentation and/or other materials provided
  14  *       with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY LEIDEN UNIVERSITY ''AS IS'' AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LEIDEN UNIVERSITY OR
  20  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  21  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  23  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * The views and conclusions contained in the software and documentation
  29  * are those of the authors and should not be interpreted as
  30  * representing official policies, either expressed or implied, of
  31  * Leiden University.
  32  */
  33
  34 #include <stdlib.h>
  35 #include <yaml.h>
  36
  37 #include "scop.h"
  38 #include "scop_yaml.h"
  39
  40 static char *extract_string(isl_ctx *ctx, yaml_document_t *document,
  41         yaml_node_t *node)
  42 {
  43         if (node->type != YAML_SCALAR_NODE)
  44                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  45                         return NULL);
  46
  47         return strdup((char *) node->data.scalar.value);
  48 }
  49
  50 static int extract_int(isl_ctx *ctx, yaml_document_t *document,
  51         yaml_node_t *node)
  52 {
  53         if (node->type != YAML_SCALAR_NODE)
  54                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  55                         return -1);
  56
  57         return atoi((char *) node->data.scalar.value);
  58 }
  59
  60 static double extract_double(isl_ctx *ctx, yaml_document_t *document,
  61         yaml_node_t *node)
  62 {
  63         if (node->type != YAML_SCALAR_NODE)
  64                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  65                         return -1);
  66
  67         return strtod((char *) node->data.scalar.value, NULL);
  68 }
  69
  70 static enum pet_expr_type extract_expr_type(isl_ctx *ctx,
  71         yaml_document_t *document, yaml_node_t *node)
  72 {
  73         if (node->type != YAML_SCALAR_NODE)
  74                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  75                         return -1);
  76
  77         return pet_str_type((char *) node->data.scalar.value);
  78 }
  79
  80 static enum pet_op_type extract_op(isl_ctx *ctx, yaml_document_t *document,
  81         yaml_node_t *node)
  82 {
  83         if (node->type != YAML_SCALAR_NODE)
  84                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  85                         return -1);
  86
  87         return pet_str_op((char *) node->data.scalar.value);
  88 }
  89
  90 static __isl_give isl_set *extract_set(isl_ctx *ctx, yaml_document_t *document,
  91         yaml_node_t *node)
  92 {
  93         if (node->type != YAML_SCALAR_NODE)
  94                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  95                         return NULL);
  96
  97         return isl_set_read_from_str(ctx, (char *) node->data.scalar.value);
  98 }
  99
 100 static __isl_give isl_id *extract_id(isl_ctx *ctx, yaml_document_t *document,
 101         yaml_node_t *node)
 102 {
 103         if (node->type != YAML_SCALAR_NODE)
 104                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 105                         return NULL);
 106
 107         return isl_id_alloc(ctx, (char *) node->data.scalar.value, NULL);
 108 }
 109
 110 static __isl_give isl_map *extract_map(isl_ctx *ctx, yaml_document_t *document,
 111         yaml_node_t *node)
 112 {
 113         if (node->type != YAML_SCALAR_NODE)
 114                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 115                         return NULL);
 116
 117         return isl_map_read_from_str(ctx, (char *) node->data.scalar.value);
 118 }
 119
 120 /* Extract an isl_multi_pw_aff from "node".
 121  */
 122 static __isl_give isl_multi_pw_aff *extract_multi_pw_aff(isl_ctx *ctx,
 123         yaml_document_t *document, yaml_node_t *node)
 124 {
 125         if (node->type != YAML_SCALAR_NODE)
 126                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 127                         return NULL);
 128
 129         return isl_multi_pw_aff_read_from_str(ctx,
 130                                             (char *) node->data.scalar.value);
 131 }
 132
 133 /* Extract a pet_type from "node".
 134  */
 135 static struct pet_type *extract_type(isl_ctx *ctx,
 136         yaml_document_t *document, yaml_node_t *node)
 137 {
 138         struct pet_type *type;
 139         yaml_node_pair_t * pair;
 140
 141         if (node->type != YAML_MAPPING_NODE)
 142                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 143                         return NULL);
 144
 145         type = isl_calloc_type(ctx, struct pet_type);
 146         if (!type)
 147                 return NULL;
 148
 149         for (pair = node->data.mapping.pairs.start;
 150              pair < node->data.mapping.pairs.top; ++pair) {
 151                 yaml_node_t *key, *value;
 152
 153                 key = yaml_document_get_node(document, pair->key);
 154                 value = yaml_document_get_node(document, pair->value);
 155
 156                 if (key->type != YAML_SCALAR_NODE)
 157                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 158                                 return pet_type_free(type));
 159
 160                 if (!strcmp((char *) key->data.scalar.value, "name"))
 161                         type->name = extract_string(ctx, document, value);
 162                 if (!strcmp((char *) key->data.scalar.value, "definition"))
 163                         type->definition = extract_string(ctx, document, value);
 164         }
 165
 166         return type;
 167 }
 168
 169 /* Extract a sequence of types from "node" and store them in scop->types.
 170  */
 171 static struct pet_scop *extract_types(isl_ctx *ctx,
 172         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 173 {
 174         int i;
 175         yaml_node_item_t *item;
 176
 177         if (node->type != YAML_SEQUENCE_NODE)
 178                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 179                         return NULL);
 180
 181         scop->n_type = node->data.sequence.items.top
 182                                 - node->data.sequence.items.start;
 183         scop->types = isl_calloc_array(ctx, struct pet_type *, scop->n_type);
 184         if (!scop->types)
 185                 return pet_scop_free(scop);
 186
 187         for (item = node->data.sequence.items.start, i = 0;
 188              item < node->data.sequence.items.top; ++item, ++i) {
 189                 yaml_node_t *n;
 190
 191                 n = yaml_document_get_node(document, *item);
 192                 scop->types[i] = extract_type(ctx, document, n);
 193                 if (!scop->types[i])
 194                         return pet_scop_free(scop);
 195         }
 196
 197         return scop;
 198 }
 199
 200 static struct pet_array *extract_array(isl_ctx *ctx, yaml_document_t *document,
 201         yaml_node_t *node)
 202 {
 203         struct pet_array *array;
 204         yaml_node_pair_t * pair;
 205
 206         if (node->type != YAML_MAPPING_NODE)
 207                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 208                         return NULL);
 209
 210         array = isl_calloc_type(ctx, struct pet_array);
 211         if (!array)
 212                 return NULL;
 213
 214         for (pair = node->data.mapping.pairs.start;
 215              pair < node->data.mapping.pairs.top; ++pair) {
 216                 yaml_node_t *key, *value;
 217
 218                 key = yaml_document_get_node(document, pair->key);
 219                 value = yaml_document_get_node(document, pair->value);
 220
 221                 if (key->type != YAML_SCALAR_NODE)
 222                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 223                                 return pet_array_free(array));
 224
 225                 if (!strcmp((char *) key->data.scalar.value, "context"))
 226                         array->context = extract_set(ctx, document, value);
 227                 if (!strcmp((char *) key->data.scalar.value, "extent"))
 228                         array->extent = extract_set(ctx, document, value);
 229                 if (!strcmp((char *) key->data.scalar.value, "value_bounds"))
 230                         array->value_bounds = extract_set(ctx, document, value);
 231                 if (!strcmp((char *) key->data.scalar.value, "element_type"))
 232                         array->element_type =
 233                                         extract_string(ctx, document, value);
 234                 if (!strcmp((char *) key->data.scalar.value, "element_size"))
 235                         array->element_size = extract_int(ctx, document, value);
 236                 if (!strcmp((char *) key->data.scalar.value, "live_out"))
 237                         array->live_out = extract_int(ctx, document, value);
 238                 if (!strcmp((char *) key->data.scalar.value,
 239                                 "uniquely_defined"))
 240                         array->uniquely_defined =
 241                                         extract_int(ctx, document, value);
 242                 if (!strcmp((char *) key->data.scalar.value, "declared"))
 243                         array->declared = extract_int(ctx, document, value);
 244                 if (!strcmp((char *) key->data.scalar.value, "exposed"))
 245                         array->exposed = extract_int(ctx, document, value);
 246         }
 247
 248         return array;
 249 }
 250
 251 static struct pet_scop *extract_arrays(isl_ctx *ctx, yaml_document_t *document,
 252         yaml_node_t *node, struct pet_scop *scop)
 253 {
 254         int i;
 255         yaml_node_item_t *item;
 256
 257         if (node->type != YAML_SEQUENCE_NODE)
 258                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 259                         return NULL);
 260
 261         scop->n_array = node->data.sequence.items.top
 262                                 - node->data.sequence.items.start;
 263         scop->arrays = isl_calloc_array(ctx, struct pet_array *, scop->n_array);
 264         if (!scop->arrays)
 265                 return pet_scop_free(scop);
 266
 267         for (item = node->data.sequence.items.start, i = 0;
 268              item < node->data.sequence.items.top; ++item, ++i) {
 269                 yaml_node_t *n;
 270
 271                 n = yaml_document_get_node(document, *item);
 272                 scop->arrays[i] = extract_array(ctx, document, n);
 273                 if (!scop->arrays[i])
 274                         return pet_scop_free(scop);
 275         }
 276
 277         return scop;
 278 }
 279
 280 static struct pet_expr *extract_expr(isl_ctx *ctx, yaml_document_t *document,
 281         yaml_node_t *node);
 282
 283 static struct pet_expr *extract_arguments(isl_ctx *ctx,
 284         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 285 {
 286         int i;
 287         yaml_node_item_t *item;
 288
 289         if (node->type != YAML_SEQUENCE_NODE)
 290                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 291                         return pet_expr_free(expr));
 292
 293         expr->n_arg = node->data.sequence.items.top
 294                                 - node->data.sequence.items.start;
 295         expr->args = isl_calloc_array(ctx, struct pet_expr *, expr->n_arg);
 296         if (!expr->args)
 297                 return pet_expr_free(expr);
 298
 299         for (item = node->data.sequence.items.start, i = 0;
 300              item < node->data.sequence.items.top; ++item, ++i) {
 301                 yaml_node_t *n;
 302
 303                 n = yaml_document_get_node(document, *item);
 304                 expr->args[i] = extract_expr(ctx, document, n);
 305                 if (!expr->args[i])
 306                         return pet_expr_free(expr);
 307         }
 308
 309         return expr;
 310 }
 311
 312 /* Extract pet_expr_double specific fields from "node" and
 313  * update "expr" accordingly.
 314  */
 315 static struct pet_expr *extract_expr_double(isl_ctx *ctx,
 316         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 317 {
 318         yaml_node_pair_t *pair;
 319
 320         for (pair = node->data.mapping.pairs.start;
 321              pair < node->data.mapping.pairs.top; ++pair) {
 322                 yaml_node_t *key, *value;
 323
 324                 key = yaml_document_get_node(document, pair->key);
 325                 value = yaml_document_get_node(document, pair->value);
 326
 327                 if (key->type != YAML_SCALAR_NODE)
 328                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 329                                 return pet_expr_free(expr));
 330
 331                 if (!strcmp((char *) key->data.scalar.value, "value"))
 332                         expr->d.val = extract_double(ctx, document, value);
 333                 if (!strcmp((char *) key->data.scalar.value, "string"))
 334                         expr->d.s = extract_string(ctx, document, value);
 335         }
 336
 337         return expr;
 338 }
 339
 340 /* Extract pet_expr_access specific fields from "node" and
 341  * update "expr" accordingly.
 342  */
 343 static struct pet_expr *extract_expr_access(isl_ctx *ctx,
 344         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 345 {
 346         yaml_node_pair_t *pair;
 347
 348         for (pair = node->data.mapping.pairs.start;
 349              pair < node->data.mapping.pairs.top; ++pair) {
 350                 yaml_node_t *key, *value;
 351
 352                 key = yaml_document_get_node(document, pair->key);
 353                 value = yaml_document_get_node(document, pair->value);
 354
 355                 if (key->type != YAML_SCALAR_NODE)
 356                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 357                                 return pet_expr_free(expr));
 358
 359                 if (!strcmp((char *) key->data.scalar.value, "relation"))
 360                         expr->acc.access = extract_map(ctx, document, value);
 361                 if (!strcmp((char *) key->data.scalar.value, "index"))
 362                         expr->acc.index = extract_multi_pw_aff(ctx, document,
 363                                                                 value);
 364                 if (!strcmp((char *) key->data.scalar.value, "reference"))
 365                         expr->acc.ref_id = extract_id(ctx, document, value);
 366                 if (!strcmp((char *) key->data.scalar.value, "read"))
 367                         expr->acc.read = extract_int(ctx, document, value);
 368                 if (!strcmp((char *) key->data.scalar.value, "write"))
 369                         expr->acc.write = extract_int(ctx, document, value);
 370         }
 371
 372         return expr;
 373 }
 374
 375 /* Extract operation expression specific fields from "node" and
 376  * update "expr" accordingly.
 377  */
 378 static struct pet_expr *extract_expr_op(isl_ctx *ctx,
 379         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 380 {
 381         yaml_node_pair_t *pair;
 382
 383         for (pair = node->data.mapping.pairs.start;
 384              pair < node->data.mapping.pairs.top; ++pair) {
 385                 yaml_node_t *key, *value;
 386
 387                 key = yaml_document_get_node(document, pair->key);
 388                 value = yaml_document_get_node(document, pair->value);
 389
 390                 if (key->type != YAML_SCALAR_NODE)
 391                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 392                                 return pet_expr_free(expr));
 393
 394                 if (!strcmp((char *) key->data.scalar.value, "operation"))
 395                         expr->op = extract_op(ctx, document, value);
 396         }
 397
 398         return expr;
 399 }
 400
 401 /* Extract pet_expr_call specific fields from "node" and
 402  * update "expr" accordingly.
 403  */
 404 static struct pet_expr *extract_expr_call(isl_ctx *ctx,
 405         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 406 {
 407         yaml_node_pair_t *pair;
 408
 409         for (pair = node->data.mapping.pairs.start;
 410              pair < node->data.mapping.pairs.top; ++pair) {
 411                 yaml_node_t *key, *value;
 412
 413                 key = yaml_document_get_node(document, pair->key);
 414                 value = yaml_document_get_node(document, pair->value);
 415
 416                 if (key->type != YAML_SCALAR_NODE)
 417                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 418                                 return pet_expr_free(expr));
 419
 420                 if (!strcmp((char *) key->data.scalar.value, "name"))
 421                         expr->name = extract_string(ctx, document, value);
 422         }
 423
 424         return expr;
 425 }
 426
 427 /* Extract pet_expr_cast specific fields from "node" and
 428  * update "expr" accordingly.
 429  */
 430 static struct pet_expr *extract_expr_cast(isl_ctx *ctx,
 431         yaml_document_t *document, yaml_node_t *node, struct pet_expr *expr)
 432 {
 433         yaml_node_pair_t *pair;
 434
 435         for (pair = node->data.mapping.pairs.start;
 436              pair < node->data.mapping.pairs.top; ++pair) {
 437                 yaml_node_t *key, *value;
 438
 439                 key = yaml_document_get_node(document, pair->key);
 440                 value = yaml_document_get_node(document, pair->value);
 441
 442                 if (key->type != YAML_SCALAR_NODE)
 443                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 444                                 return pet_expr_free(expr));
 445
 446                 if (!strcmp((char *) key->data.scalar.value, "type_name"))
 447                         expr->type_name = extract_string(ctx, document, value);
 448         }
 449
 450         return expr;
 451 }
 452
 453 /* Extract a pet_expr from "node".
 454  *
 455  * We first extract the type and arguments of the expression and
 456  * then extract additional fields depending on the type.
 457  */
 458 static struct pet_expr *extract_expr(isl_ctx *ctx, yaml_document_t *document,
 459         yaml_node_t *node)
 460 {
 461         struct pet_expr *expr;
 462         yaml_node_pair_t *pair;
 463
 464         if (node->type != YAML_MAPPING_NODE)
 465                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 466                         return NULL);
 467
 468         expr = isl_calloc_type(ctx, struct pet_expr);
 469         if (!expr)
 470                 return NULL;
 471
 472         for (pair = node->data.mapping.pairs.start;
 473              pair < node->data.mapping.pairs.top; ++pair) {
 474                 yaml_node_t *key, *value;
 475
 476                 key = yaml_document_get_node(document, pair->key);
 477                 value = yaml_document_get_node(document, pair->value);
 478
 479                 if (key->type != YAML_SCALAR_NODE)
 480                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 481                                 return pet_expr_free(expr));
 482
 483                 if (!strcmp((char *) key->data.scalar.value, "type"))
 484                         expr->type = extract_expr_type(ctx, document, value);
 485
 486                 if (!strcmp((char *) key->data.scalar.value, "arguments"))
 487                         expr = extract_arguments(ctx, document, value, expr);
 488                 if (!expr)
 489                         return NULL;
 490         }
 491
 492         switch (expr->type) {
 493         case pet_expr_access:
 494                 expr = extract_expr_access(ctx, document, node, expr);
 495                 break;
 496         case pet_expr_double:
 497                 expr = extract_expr_double(ctx, document, node, expr);
 498                 break;
 499         case pet_expr_call:
 500                 expr = extract_expr_call(ctx, document, node, expr);
 501                 break;
 502         case pet_expr_cast:
 503                 expr = extract_expr_cast(ctx, document, node, expr);
 504                 break;
 505         case pet_expr_unary:
 506         case pet_expr_binary:
 507         case pet_expr_ternary:
 508                 expr = extract_expr_op(ctx, document, node, expr);
 509                 break;
 510         }
 511
 512         return expr;
 513 }
 514
 515 static struct pet_stmt *extract_stmt_arguments(isl_ctx *ctx,
 516         yaml_document_t *document, yaml_node_t *node, struct pet_stmt *stmt)
 517 {
 518         int i;
 519         yaml_node_item_t *item;
 520
 521         if (node->type != YAML_SEQUENCE_NODE)
 522                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 523                         return pet_stmt_free(stmt));
 524
 525         stmt->n_arg = node->data.sequence.items.top
 526                                 - node->data.sequence.items.start;
 527         stmt->args = isl_calloc_array(ctx, struct pet_expr *, stmt->n_arg);
 528         if (!stmt->args)
 529                 return pet_stmt_free(stmt);
 530
 531         for (item = node->data.sequence.items.start, i = 0;
 532              item < node->data.sequence.items.top; ++item, ++i) {
 533                 yaml_node_t *n;
 534
 535                 n = yaml_document_get_node(document, *item);
 536                 stmt->args[i] = extract_expr(ctx, document, n);
 537                 if (!stmt->args[i])
 538                         return pet_stmt_free(stmt);
 539         }
 540
 541         return stmt;
 542 }
 543
 544 static struct pet_stmt *extract_stmt(isl_ctx *ctx, yaml_document_t *document,
 545         yaml_node_t *node)
 546 {
 547         struct pet_stmt *stmt;
 548         yaml_node_pair_t * pair;
 549
 550         if (node->type != YAML_MAPPING_NODE)
 551                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 552                         return NULL);
 553
 554         stmt = isl_calloc_type(ctx, struct pet_stmt);
 555         if (!stmt)
 556                 return NULL;
 557
 558         for (pair = node->data.mapping.pairs.start;
 559              pair < node->data.mapping.pairs.top; ++pair) {
 560                 yaml_node_t *key, *value;
 561
 562                 key = yaml_document_get_node(document, pair->key);
 563                 value = yaml_document_get_node(document, pair->value);
 564
 565                 if (key->type != YAML_SCALAR_NODE)
 566                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 567                                 return pet_stmt_free(stmt));
 568
 569                 if (!strcmp((char *) key->data.scalar.value, "line"))
 570                         stmt->line = extract_int(ctx, document, value);
 571                 if (!strcmp((char *) key->data.scalar.value, "domain"))
 572                         stmt->domain = extract_set(ctx, document, value);
 573                 if (!strcmp((char *) key->data.scalar.value, "schedule"))
 574                         stmt->schedule = extract_map(ctx, document, value);
 575                 if (!strcmp((char *) key->data.scalar.value, "body"))
 576                         stmt->body = extract_expr(ctx, document, value);
 577
 578                 if (!strcmp((char *) key->data.scalar.value, "arguments"))
 579                         stmt = extract_stmt_arguments(ctx, document,
 580                                                         value, stmt);
 581                 if (!stmt)
 582                         return NULL;
 583         }
 584
 585         return stmt;
 586 }
 587
 588 static struct pet_scop *extract_statements(isl_ctx *ctx,
 589         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 590 {
 591         int i;
 592         yaml_node_item_t *item;
 593
 594         if (node->type != YAML_SEQUENCE_NODE)
 595                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 596                         return NULL);
 597
 598         scop->n_stmt = node->data.sequence.items.top
 599                                 - node->data.sequence.items.start;
 600         scop->stmts = isl_calloc_array(ctx, struct pet_stmt *, scop->n_stmt);
 601         if (!scop->stmts)
 602                 return pet_scop_free(scop);
 603
 604         for (item = node->data.sequence.items.start, i = 0;
 605              item < node->data.sequence.items.top; ++item, ++i) {
 606                 yaml_node_t *n;
 607
 608                 n = yaml_document_get_node(document, *item);
 609                 scop->stmts[i] = extract_stmt(ctx, document, n);
 610                 if (!scop->stmts[i])
 611                         return pet_scop_free(scop);
 612         }
 613
 614         return scop;
 615 }
 616
 617 /* Extract a pet_implication from "node".
 618  */
 619 static struct pet_implication *extract_implication(isl_ctx *ctx,
 620         yaml_document_t *document, yaml_node_t *node)
 621 {
 622         struct pet_implication *implication;
 623         yaml_node_pair_t * pair;
 624
 625         if (node->type != YAML_MAPPING_NODE)
 626                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 627                         return NULL);
 628
 629         implication = isl_calloc_type(ctx, struct pet_implication);
 630         if (!implication)
 631                 return NULL;
 632
 633         for (pair = node->data.mapping.pairs.start;
 634              pair < node->data.mapping.pairs.top; ++pair) {
 635                 yaml_node_t *key, *value;
 636
 637                 key = yaml_document_get_node(document, pair->key);
 638                 value = yaml_document_get_node(document, pair->value);
 639
 640                 if (key->type != YAML_SCALAR_NODE)
 641                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 642                                 return pet_implication_free(implication));
 643
 644                 if (!strcmp((char *) key->data.scalar.value, "satisfied"))
 645                         implication->satisfied =
 646                                             extract_int(ctx, document, value);
 647                 if (!strcmp((char *) key->data.scalar.value, "extension"))
 648                         implication->extension =
 649                                             extract_map(ctx, document, value);
 650         }
 651
 652         return implication;
 653 }
 654
 655 /* Extract a sequence of implications from "node" and
 656  * store them in scop->implications.
 657  */
 658 static struct pet_scop *extract_implications(isl_ctx *ctx,
 659         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 660 {
 661         int i;
 662         yaml_node_item_t *item;
 663
 664         if (node->type != YAML_SEQUENCE_NODE)
 665                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 666                         return NULL);
 667
 668         scop->n_implication = node->data.sequence.items.top
 669                                 - node->data.sequence.items.start;
 670         scop->implications = isl_calloc_array(ctx, struct pet_implication *,
 671                                                 scop->n_implication);
 672         if (!scop->implications)
 673                 return pet_scop_free(scop);
 674
 675         for (item = node->data.sequence.items.start, i = 0;
 676              item < node->data.sequence.items.top; ++item, ++i) {
 677                 yaml_node_t *n;
 678
 679                 n = yaml_document_get_node(document, *item);
 680                 scop->implications[i] = extract_implication(ctx, document, n);
 681                 if (!scop->implications[i])
 682                         return pet_scop_free(scop);
 683         }
 684
 685         return scop;
 686 }
 687
 688 static struct pet_scop *extract_scop(isl_ctx *ctx, yaml_document_t *document,
 689         yaml_node_t *node)
 690 {
 691         struct pet_scop *scop;
 692         yaml_node_pair_t * pair;
 693
 694         if (!node)
 695                 return NULL;
 696
 697         if (node->type != YAML_MAPPING_NODE)
 698                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 699                         return NULL);
 700
 701         scop = pet_scop_alloc(ctx);
 702         if (!scop)
 703                 return NULL;
 704
 705         for (pair = node->data.mapping.pairs.start;
 706              pair < node->data.mapping.pairs.top; ++pair) {
 707                 yaml_node_t *key, *value;
 708
 709                 key = yaml_document_get_node(document, pair->key);
 710                 value = yaml_document_get_node(document, pair->value);
 711
 712                 if (key->type != YAML_SCALAR_NODE)
 713                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 714                                 return pet_scop_free(scop));
 715                 if (!strcmp((char *) key->data.scalar.value, "context"))
 716                         scop->context = extract_set(ctx, document, value);
 717                 if (!strcmp((char *) key->data.scalar.value, "context_value"))
 718                         scop->context_value = extract_set(ctx, document, value);
 719                 if (!strcmp((char *) key->data.scalar.value, "types"))
 720                         scop = extract_types(ctx, document, value, scop);
 721                 if (!strcmp((char *) key->data.scalar.value, "arrays"))
 722                         scop = extract_arrays(ctx, document, value, scop);
 723                 if (!strcmp((char *) key->data.scalar.value, "statements"))
 724                         scop = extract_statements(ctx, document, value, scop);
 725                 if (!strcmp((char *) key->data.scalar.value, "implications"))
 726                         scop = extract_implications(ctx, document, value, scop);
 727                 if (!scop)
 728                         return NULL;
 729         }
 730
 731         if (!scop->context_value) {
 732                 isl_space *space = isl_space_params_alloc(ctx, 0);
 733                 scop->context_value = isl_set_universe(space);
 734                 if (!scop->context_value)
 735                         return pet_scop_free(scop);
 736         }
 737
 738         return scop;
 739 }
 740
 741 /* Extract a pet_scop from the YAML description in "in".
 742  */
 743 struct pet_scop *pet_scop_parse(isl_ctx *ctx, FILE *in)
 744 {
 745         struct pet_scop *scop = NULL;
 746         yaml_parser_t parser;
 747         yaml_node_t *root;
 748         yaml_document_t document = { 0 };
 749
 750         yaml_parser_initialize(&parser);
 751
 752         yaml_parser_set_input_file(&parser, in);
 753
 754         if (!yaml_parser_load(&parser, &document))
 755                 goto error;
 756
 757         root = yaml_document_get_root_node(&document);
 758
 759         scop = extract_scop(ctx, &document, root);
 760
 761         yaml_document_delete(&document);
 762
 763         yaml_parser_delete(&parser);
 764
 765         return scop;
 766 error:
 767         yaml_parser_delete(&parser);
 768         pet_scop_free(scop);
 769         return NULL;
 770 }