parse.c

   1 /*
   2  * Copyright 2011 Leiden University. All rights reserved.
   3  * Copyright 2013 Ecole Normale Superieure. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  *    1. Redistributions of source code must retain the above copyright
  10  *       notice, this list of conditions and the following disclaimer.
  11  *
  12  *    2. Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials provided
  15  *       with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY LEIDEN UNIVERSITY ''AS IS'' AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LEIDEN UNIVERSITY OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  24  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * The views and conclusions contained in the software and documentation
  30  * are those of the authors and should not be interpreted as
  31  * representing official policies, either expressed or implied, of
  32  * Leiden University.
  33  */
  34
  35 #include <stdlib.h>
  36 #include <yaml.h>
  37
  38 #include "expr.h"
  39 #include "loc.h"
  40 #include "scop.h"
  41 #include "scop_yaml.h"
  42
  43 static char *extract_string(isl_ctx *ctx, yaml_document_t *document,
  44         yaml_node_t *node)
  45 {
  46         if (node->type != YAML_SCALAR_NODE)
  47                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  48                         return NULL);
  49
  50         return strdup((char *) node->data.scalar.value);
  51 }
  52
  53 static int extract_int(isl_ctx *ctx, yaml_document_t *document,
  54         yaml_node_t *node)
  55 {
  56         if (node->type != YAML_SCALAR_NODE)
  57                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  58                         return -1);
  59
  60         return atoi((char *) node->data.scalar.value);
  61 }
  62
  63 static double extract_double(isl_ctx *ctx, yaml_document_t *document,
  64         yaml_node_t *node)
  65 {
  66         if (node->type != YAML_SCALAR_NODE)
  67                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  68                         return -1);
  69
  70         return strtod((char *) node->data.scalar.value, NULL);
  71 }
  72
  73 static enum pet_expr_type extract_expr_type(isl_ctx *ctx,
  74         yaml_document_t *document, yaml_node_t *node)
  75 {
  76         if (node->type != YAML_SCALAR_NODE)
  77                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  78                         return -1);
  79
  80         return pet_str_type((char *) node->data.scalar.value);
  81 }
  82
  83 static enum pet_op_type extract_op(isl_ctx *ctx, yaml_document_t *document,
  84         yaml_node_t *node)
  85 {
  86         if (node->type != YAML_SCALAR_NODE)
  87                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  88                         return -1);
  89
  90         return pet_str_op((char *) node->data.scalar.value);
  91 }
  92
  93 static __isl_give isl_set *extract_set(isl_ctx *ctx, yaml_document_t *document,
  94         yaml_node_t *node)
  95 {
  96         if (node->type != YAML_SCALAR_NODE)
  97                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
  98                         return NULL);
  99
 100         return isl_set_read_from_str(ctx, (char *) node->data.scalar.value);
 101 }
 102
 103 static __isl_give isl_id *extract_id(isl_ctx *ctx, yaml_document_t *document,
 104         yaml_node_t *node)
 105 {
 106         if (node->type != YAML_SCALAR_NODE)
 107                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 108                         return NULL);
 109
 110         return isl_id_alloc(ctx, (char *) node->data.scalar.value, NULL);
 111 }
 112
 113 static __isl_give isl_map *extract_map(isl_ctx *ctx, yaml_document_t *document,
 114         yaml_node_t *node)
 115 {
 116         if (node->type != YAML_SCALAR_NODE)
 117                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 118                         return NULL);
 119
 120         return isl_map_read_from_str(ctx, (char *) node->data.scalar.value);
 121 }
 122
 123 /* Extract an isl_val from "node".
 124  */
 125 static __isl_give isl_val *extract_val(isl_ctx *ctx, yaml_document_t *document,
 126         yaml_node_t *node)
 127 {
 128         if (node->type != YAML_SCALAR_NODE)
 129                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 130                         return NULL);
 131
 132         return isl_val_read_from_str(ctx, (char *) node->data.scalar.value);
 133 }
 134
 135 /* Extract an isl_multi_pw_aff from "node".
 136  */
 137 static __isl_give isl_multi_pw_aff *extract_multi_pw_aff(isl_ctx *ctx,
 138         yaml_document_t *document, yaml_node_t *node)
 139 {
 140         if (node->type != YAML_SCALAR_NODE)
 141                 isl_die(ctx, isl_error_invalid, "expecting scalar node",
 142                         return NULL);
 143
 144         return isl_multi_pw_aff_read_from_str(ctx,
 145                                             (char *) node->data.scalar.value);
 146 }
 147
 148 /* Extract a pet_type from "node".
 149  */
 150 static struct pet_type *extract_type(isl_ctx *ctx,
 151         yaml_document_t *document, yaml_node_t *node)
 152 {
 153         struct pet_type *type;
 154         yaml_node_pair_t * pair;
 155
 156         if (node->type != YAML_MAPPING_NODE)
 157                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 158                         return NULL);
 159
 160         type = isl_calloc_type(ctx, struct pet_type);
 161         if (!type)
 162                 return NULL;
 163
 164         for (pair = node->data.mapping.pairs.start;
 165              pair < node->data.mapping.pairs.top; ++pair) {
 166                 yaml_node_t *key, *value;
 167
 168                 key = yaml_document_get_node(document, pair->key);
 169                 value = yaml_document_get_node(document, pair->value);
 170
 171                 if (key->type != YAML_SCALAR_NODE)
 172                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 173                                 return pet_type_free(type));
 174
 175                 if (!strcmp((char *) key->data.scalar.value, "name"))
 176                         type->name = extract_string(ctx, document, value);
 177                 if (!strcmp((char *) key->data.scalar.value, "definition"))
 178                         type->definition = extract_string(ctx, document, value);
 179         }
 180
 181         return type;
 182 }
 183
 184 /* Extract a sequence of types from "node" and store them in scop->types.
 185  */
 186 static struct pet_scop *extract_types(isl_ctx *ctx,
 187         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 188 {
 189         int i;
 190         yaml_node_item_t *item;
 191
 192         if (node->type != YAML_SEQUENCE_NODE)
 193                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 194                         return NULL);
 195
 196         scop->n_type = node->data.sequence.items.top
 197                                 - node->data.sequence.items.start;
 198         scop->types = isl_calloc_array(ctx, struct pet_type *, scop->n_type);
 199         if (!scop->types)
 200                 return pet_scop_free(scop);
 201
 202         for (item = node->data.sequence.items.start, i = 0;
 203              item < node->data.sequence.items.top; ++item, ++i) {
 204                 yaml_node_t *n;
 205
 206                 n = yaml_document_get_node(document, *item);
 207                 scop->types[i] = extract_type(ctx, document, n);
 208                 if (!scop->types[i])
 209                         return pet_scop_free(scop);
 210         }
 211
 212         return scop;
 213 }
 214
 215 static struct pet_array *extract_array(isl_ctx *ctx, yaml_document_t *document,
 216         yaml_node_t *node)
 217 {
 218         struct pet_array *array;
 219         yaml_node_pair_t * pair;
 220
 221         if (node->type != YAML_MAPPING_NODE)
 222                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 223                         return NULL);
 224
 225         array = isl_calloc_type(ctx, struct pet_array);
 226         if (!array)
 227                 return NULL;
 228
 229         for (pair = node->data.mapping.pairs.start;
 230              pair < node->data.mapping.pairs.top; ++pair) {
 231                 yaml_node_t *key, *value;
 232
 233                 key = yaml_document_get_node(document, pair->key);
 234                 value = yaml_document_get_node(document, pair->value);
 235
 236                 if (key->type != YAML_SCALAR_NODE)
 237                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 238                                 return pet_array_free(array));
 239
 240                 if (!strcmp((char *) key->data.scalar.value, "context"))
 241                         array->context = extract_set(ctx, document, value);
 242                 if (!strcmp((char *) key->data.scalar.value, "extent"))
 243                         array->extent = extract_set(ctx, document, value);
 244                 if (!strcmp((char *) key->data.scalar.value, "value_bounds"))
 245                         array->value_bounds = extract_set(ctx, document, value);
 246                 if (!strcmp((char *) key->data.scalar.value, "element_type"))
 247                         array->element_type =
 248                                         extract_string(ctx, document, value);
 249                 if (!strcmp((char *) key->data.scalar.value, "element_size"))
 250                         array->element_size = extract_int(ctx, document, value);
 251                 if (!strcmp((char *) key->data.scalar.value,
 252                                 "element_is_record"))
 253                         array->element_is_record =
 254                                         extract_int(ctx, document, value);
 255                 if (!strcmp((char *) key->data.scalar.value, "live_out"))
 256                         array->live_out = extract_int(ctx, document, value);
 257                 if (!strcmp((char *) key->data.scalar.value,
 258                                 "uniquely_defined"))
 259                         array->uniquely_defined =
 260                                         extract_int(ctx, document, value);
 261                 if (!strcmp((char *) key->data.scalar.value, "declared"))
 262                         array->declared = extract_int(ctx, document, value);
 263                 if (!strcmp((char *) key->data.scalar.value, "exposed"))
 264                         array->exposed = extract_int(ctx, document, value);
 265         }
 266
 267         return array;
 268 }
 269
 270 static struct pet_scop *extract_arrays(isl_ctx *ctx, yaml_document_t *document,
 271         yaml_node_t *node, struct pet_scop *scop)
 272 {
 273         int i;
 274         yaml_node_item_t *item;
 275
 276         if (node->type != YAML_SEQUENCE_NODE)
 277                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 278                         return NULL);
 279
 280         scop->n_array = node->data.sequence.items.top
 281                                 - node->data.sequence.items.start;
 282         scop->arrays = isl_calloc_array(ctx, struct pet_array *, scop->n_array);
 283         if (!scop->arrays)
 284                 return pet_scop_free(scop);
 285
 286         for (item = node->data.sequence.items.start, i = 0;
 287              item < node->data.sequence.items.top; ++item, ++i) {
 288                 yaml_node_t *n;
 289
 290                 n = yaml_document_get_node(document, *item);
 291                 scop->arrays[i] = extract_array(ctx, document, n);
 292                 if (!scop->arrays[i])
 293                         return pet_scop_free(scop);
 294         }
 295
 296         return scop;
 297 }
 298
 299 static __isl_give pet_expr *extract_expr(isl_ctx *ctx,
 300         yaml_document_t *document, yaml_node_t *node);
 301
 302 static __isl_give pet_expr *extract_arguments(isl_ctx *ctx,
 303         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 304 {
 305         int i, n;
 306         yaml_node_item_t *item;
 307
 308         if (node->type != YAML_SEQUENCE_NODE)
 309                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 310                         return pet_expr_free(expr));
 311
 312         n = node->data.sequence.items.top - node->data.sequence.items.start;
 313         expr = pet_expr_set_n_arg(expr, n);
 314
 315         for (item = node->data.sequence.items.start, i = 0;
 316              item < node->data.sequence.items.top; ++item, ++i) {
 317                 yaml_node_t *n;
 318                 pet_expr *arg;
 319
 320                 n = yaml_document_get_node(document, *item);
 321                 arg = extract_expr(ctx, document, n);
 322                 expr = pet_expr_set_arg(expr, i, arg);
 323         }
 324
 325         return expr;
 326 }
 327
 328 /* Extract pet_expr_double specific fields from "node" and
 329  * update "expr" accordingly.
 330  */
 331 static __isl_give pet_expr *extract_expr_double(isl_ctx *ctx,
 332         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 333 {
 334         yaml_node_pair_t *pair;
 335         double d = 0;
 336         char *s = NULL;
 337
 338         for (pair = node->data.mapping.pairs.start;
 339              pair < node->data.mapping.pairs.top; ++pair) {
 340                 yaml_node_t *key, *value;
 341
 342                 key = yaml_document_get_node(document, pair->key);
 343                 value = yaml_document_get_node(document, pair->value);
 344
 345                 if (key->type != YAML_SCALAR_NODE)
 346                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 347                                 return pet_expr_free(expr));
 348
 349                 if (!strcmp((char *) key->data.scalar.value, "value"))
 350                         d = extract_double(ctx, document, value);
 351                 if (!strcmp((char *) key->data.scalar.value, "string"))
 352                         s = extract_string(ctx, document, value);
 353         }
 354
 355         expr = pet_expr_double_set(expr, d, s);
 356         free(s);
 357
 358         return expr;
 359 }
 360
 361 /* Extract pet_expr_access specific fields from "node" and
 362  * update "expr" accordingly.
 363  */
 364 static __isl_give pet_expr *extract_expr_access(isl_ctx *ctx,
 365         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 366 {
 367         yaml_node_pair_t *pair;
 368
 369         for (pair = node->data.mapping.pairs.start;
 370              pair < node->data.mapping.pairs.top; ++pair) {
 371                 yaml_node_t *key, *value;
 372
 373                 key = yaml_document_get_node(document, pair->key);
 374                 value = yaml_document_get_node(document, pair->value);
 375
 376                 if (key->type != YAML_SCALAR_NODE)
 377                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 378                                 return pet_expr_free(expr));
 379
 380                 if (!strcmp((char *) key->data.scalar.value, "relation"))
 381                         expr = pet_expr_access_set_access(expr,
 382                                     extract_map(ctx, document, value));
 383                 if (!strcmp((char *) key->data.scalar.value, "index"))
 384                         expr = pet_expr_access_set_index(expr,
 385                                     extract_multi_pw_aff(ctx, document, value));
 386                 if (!strcmp((char *) key->data.scalar.value, "reference"))
 387                         expr = pet_expr_access_set_ref_id(expr,
 388                                     extract_id(ctx, document, value));
 389                 if (!strcmp((char *) key->data.scalar.value, "read"))
 390                         expr = pet_expr_access_set_read(expr,
 391                                     extract_int(ctx, document, value));
 392                 if (!strcmp((char *) key->data.scalar.value, "write"))
 393                         expr = pet_expr_access_set_write(expr,
 394                                     extract_int(ctx, document, value));
 395         }
 396
 397         return expr;
 398 }
 399
 400 /* Extract operation expression specific fields from "node" and
 401  * update "expr" accordingly.
 402  */
 403 static __isl_give pet_expr *extract_expr_op(isl_ctx *ctx,
 404         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 405 {
 406         yaml_node_pair_t *pair;
 407
 408         for (pair = node->data.mapping.pairs.start;
 409              pair < node->data.mapping.pairs.top; ++pair) {
 410                 yaml_node_t *key, *value;
 411
 412                 key = yaml_document_get_node(document, pair->key);
 413                 value = yaml_document_get_node(document, pair->value);
 414
 415                 if (key->type != YAML_SCALAR_NODE)
 416                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 417                                 return pet_expr_free(expr));
 418
 419                 if (!strcmp((char *) key->data.scalar.value, "operation"))
 420                         expr = pet_expr_op_set_type(expr,
 421                                             extract_op(ctx, document, value));
 422         }
 423
 424         return expr;
 425 }
 426
 427 /* Extract pet_expr_call specific fields from "node" and
 428  * update "expr" accordingly.
 429  */
 430 static __isl_give pet_expr *extract_expr_call(isl_ctx *ctx,
 431         yaml_document_t *document, yaml_node_t *node, __isl_take 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, "name"))
 447                         expr = pet_expr_call_set_name(expr,
 448                                         extract_string(ctx, document, value));
 449         }
 450
 451         return expr;
 452 }
 453
 454 /* Extract pet_expr_cast specific fields from "node" and
 455  * update "expr" accordingly.
 456  */
 457 static __isl_give pet_expr *extract_expr_cast(isl_ctx *ctx,
 458         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 459 {
 460         yaml_node_pair_t *pair;
 461
 462         for (pair = node->data.mapping.pairs.start;
 463              pair < node->data.mapping.pairs.top; ++pair) {
 464                 yaml_node_t *key, *value;
 465
 466                 key = yaml_document_get_node(document, pair->key);
 467                 value = yaml_document_get_node(document, pair->value);
 468
 469                 if (key->type != YAML_SCALAR_NODE)
 470                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 471                                 return pet_expr_free(expr));
 472
 473                 if (!strcmp((char *) key->data.scalar.value, "type_name"))
 474                         expr = pet_expr_cast_set_type_name(expr,
 475                                         extract_string(ctx, document, value));
 476         }
 477
 478         return expr;
 479 }
 480
 481 /* Extract pet_expr_int specific fields from "node" and
 482  * update "expr" accordingly.
 483  */
 484 static __isl_give pet_expr *extract_expr_int(isl_ctx *ctx,
 485         yaml_document_t *document, yaml_node_t *node, __isl_take pet_expr *expr)
 486 {
 487         yaml_node_pair_t * pair;
 488
 489         for (pair = node->data.mapping.pairs.start;
 490              pair < node->data.mapping.pairs.top; ++pair) {
 491                 yaml_node_t *key, *value;
 492
 493                 key = yaml_document_get_node(document, pair->key);
 494                 value = yaml_document_get_node(document, pair->value);
 495
 496                 if (key->type != YAML_SCALAR_NODE)
 497                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 498                                 return pet_expr_free(expr));
 499
 500                 if (!strcmp((char *) key->data.scalar.value, "value"))
 501                         expr = pet_expr_int_set_val(expr,
 502                                             extract_val(ctx, document, value));
 503         }
 504
 505         return expr;
 506 }
 507
 508 /* Extract a pet_expr from "node".
 509  *
 510  * We first extract the type and arguments of the expression and
 511  * then extract additional fields depending on the type.
 512  */
 513 static __isl_give pet_expr *extract_expr(isl_ctx *ctx,
 514         yaml_document_t *document, yaml_node_t *node)
 515 {
 516         enum pet_expr_type type = pet_expr_error;
 517         pet_expr *expr;
 518         yaml_node_pair_t *pair;
 519
 520         if (node->type != YAML_MAPPING_NODE)
 521                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 522                         return NULL);
 523
 524         for (pair = node->data.mapping.pairs.start;
 525              pair < node->data.mapping.pairs.top; ++pair) {
 526                 yaml_node_t *key, *value;
 527
 528                 key = yaml_document_get_node(document, pair->key);
 529                 value = yaml_document_get_node(document, pair->value);
 530
 531                 if (key->type != YAML_SCALAR_NODE)
 532                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 533                                 return pet_expr_free(expr));
 534
 535                 if (!strcmp((char *) key->data.scalar.value, "type"))
 536                         type = extract_expr_type(ctx, document, value);
 537         }
 538
 539         if (type == pet_expr_error)
 540                 isl_die(ctx, isl_error_invalid, "cannot determine type",
 541                         return NULL);
 542
 543         expr = pet_expr_alloc(ctx, type);
 544         if (!expr)
 545                 return NULL;
 546
 547         for (pair = node->data.mapping.pairs.start;
 548              pair < node->data.mapping.pairs.top; ++pair) {
 549                 yaml_node_t *key, *value;
 550
 551                 key = yaml_document_get_node(document, pair->key);
 552                 value = yaml_document_get_node(document, pair->value);
 553
 554                 if (!strcmp((char *) key->data.scalar.value, "arguments"))
 555                         expr = extract_arguments(ctx, document, value, expr);
 556                 if (!expr)
 557                         return NULL;
 558         }
 559
 560         switch (type) {
 561         case pet_expr_error:
 562                 isl_die(ctx, isl_error_internal, "unreachable code",
 563                         return NULL);
 564         case pet_expr_access:
 565                 expr = extract_expr_access(ctx, document, node, expr);
 566                 break;
 567         case pet_expr_double:
 568                 expr = extract_expr_double(ctx, document, node, expr);
 569                 break;
 570         case pet_expr_call:
 571                 expr = extract_expr_call(ctx, document, node, expr);
 572                 break;
 573         case pet_expr_cast:
 574                 expr = extract_expr_cast(ctx, document, node, expr);
 575                 break;
 576         case pet_expr_int:
 577                 expr = extract_expr_int(ctx, document, node, expr);
 578                 break;
 579         case pet_expr_op:
 580                 expr = extract_expr_op(ctx, document, node, expr);
 581                 break;
 582         }
 583
 584         return expr;
 585 }
 586
 587 static struct pet_stmt *extract_stmt_arguments(isl_ctx *ctx,
 588         yaml_document_t *document, yaml_node_t *node, struct pet_stmt *stmt)
 589 {
 590         int i;
 591         yaml_node_item_t *item;
 592
 593         if (node->type != YAML_SEQUENCE_NODE)
 594                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 595                         return pet_stmt_free(stmt));
 596
 597         stmt->n_arg = node->data.sequence.items.top
 598                                 - node->data.sequence.items.start;
 599         stmt->args = isl_calloc_array(ctx, pet_expr *, stmt->n_arg);
 600         if (!stmt->args)
 601                 return pet_stmt_free(stmt);
 602
 603         for (item = node->data.sequence.items.start, i = 0;
 604              item < node->data.sequence.items.top; ++item, ++i) {
 605                 yaml_node_t *n;
 606
 607                 n = yaml_document_get_node(document, *item);
 608                 stmt->args[i] = extract_expr(ctx, document, n);
 609                 if (!stmt->args[i])
 610                         return pet_stmt_free(stmt);
 611         }
 612
 613         return stmt;
 614 }
 615
 616 static struct pet_stmt *extract_stmt(isl_ctx *ctx, yaml_document_t *document,
 617         yaml_node_t *node)
 618 {
 619         struct pet_stmt *stmt;
 620         yaml_node_pair_t * pair;
 621         int line = -1;
 622         unsigned start = 0, end = 0;
 623
 624         if (node->type != YAML_MAPPING_NODE)
 625                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 626                         return NULL);
 627
 628         stmt = isl_calloc_type(ctx, struct pet_stmt);
 629         if (!stmt)
 630                 return NULL;
 631
 632         stmt->loc = &pet_loc_dummy;
 633
 634         for (pair = node->data.mapping.pairs.start;
 635              pair < node->data.mapping.pairs.top; ++pair) {
 636                 yaml_node_t *key, *value;
 637
 638                 key = yaml_document_get_node(document, pair->key);
 639                 value = yaml_document_get_node(document, pair->value);
 640
 641                 if (key->type != YAML_SCALAR_NODE)
 642                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 643                                 return pet_stmt_free(stmt));
 644
 645                 if (!strcmp((char *) key->data.scalar.value, "line"))
 646                         line = extract_int(ctx, document, value);
 647                 if (!strcmp((char *) key->data.scalar.value, "start"))
 648                         start = extract_int(ctx, document, value);
 649                 if (!strcmp((char *) key->data.scalar.value, "end"))
 650                         end = extract_int(ctx, document, value);
 651                 if (!strcmp((char *) key->data.scalar.value, "domain"))
 652                         stmt->domain = extract_set(ctx, document, value);
 653                 if (!strcmp((char *) key->data.scalar.value, "schedule"))
 654                         stmt->schedule = extract_map(ctx, document, value);
 655                 if (!strcmp((char *) key->data.scalar.value, "body"))
 656                         stmt->body = extract_expr(ctx, document, value);
 657
 658                 if (!strcmp((char *) key->data.scalar.value, "arguments"))
 659                         stmt = extract_stmt_arguments(ctx, document,
 660                                                         value, stmt);
 661                 if (!stmt)
 662                         return NULL;
 663         }
 664
 665         stmt->loc = pet_loc_alloc(ctx, start, end, line);
 666         if (!stmt->loc)
 667                 return pet_stmt_free(stmt);
 668
 669         return stmt;
 670 }
 671
 672 static struct pet_scop *extract_statements(isl_ctx *ctx,
 673         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 674 {
 675         int i;
 676         yaml_node_item_t *item;
 677
 678         if (node->type != YAML_SEQUENCE_NODE)
 679                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 680                         return NULL);
 681
 682         scop->n_stmt = node->data.sequence.items.top
 683                                 - node->data.sequence.items.start;
 684         scop->stmts = isl_calloc_array(ctx, struct pet_stmt *, scop->n_stmt);
 685         if (!scop->stmts)
 686                 return pet_scop_free(scop);
 687
 688         for (item = node->data.sequence.items.start, i = 0;
 689              item < node->data.sequence.items.top; ++item, ++i) {
 690                 yaml_node_t *n;
 691
 692                 n = yaml_document_get_node(document, *item);
 693                 scop->stmts[i] = extract_stmt(ctx, document, n);
 694                 if (!scop->stmts[i])
 695                         return pet_scop_free(scop);
 696         }
 697
 698         return scop;
 699 }
 700
 701 /* Extract a pet_implication from "node".
 702  */
 703 static struct pet_implication *extract_implication(isl_ctx *ctx,
 704         yaml_document_t *document, yaml_node_t *node)
 705 {
 706         struct pet_implication *implication;
 707         yaml_node_pair_t * pair;
 708
 709         if (node->type != YAML_MAPPING_NODE)
 710                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 711                         return NULL);
 712
 713         implication = isl_calloc_type(ctx, struct pet_implication);
 714         if (!implication)
 715                 return NULL;
 716
 717         for (pair = node->data.mapping.pairs.start;
 718              pair < node->data.mapping.pairs.top; ++pair) {
 719                 yaml_node_t *key, *value;
 720
 721                 key = yaml_document_get_node(document, pair->key);
 722                 value = yaml_document_get_node(document, pair->value);
 723
 724                 if (key->type != YAML_SCALAR_NODE)
 725                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 726                                 return pet_implication_free(implication));
 727
 728                 if (!strcmp((char *) key->data.scalar.value, "satisfied"))
 729                         implication->satisfied =
 730                                             extract_int(ctx, document, value);
 731                 if (!strcmp((char *) key->data.scalar.value, "extension"))
 732                         implication->extension =
 733                                             extract_map(ctx, document, value);
 734         }
 735
 736         return implication;
 737 }
 738
 739 /* Extract a sequence of implications from "node" and
 740  * store them in scop->implications.
 741  */
 742 static struct pet_scop *extract_implications(isl_ctx *ctx,
 743         yaml_document_t *document, yaml_node_t *node, struct pet_scop *scop)
 744 {
 745         int i;
 746         yaml_node_item_t *item;
 747
 748         if (node->type != YAML_SEQUENCE_NODE)
 749                 isl_die(ctx, isl_error_invalid, "expecting sequence",
 750                         return NULL);
 751
 752         scop->n_implication = node->data.sequence.items.top
 753                                 - node->data.sequence.items.start;
 754         scop->implications = isl_calloc_array(ctx, struct pet_implication *,
 755                                                 scop->n_implication);
 756         if (!scop->implications)
 757                 return pet_scop_free(scop);
 758
 759         for (item = node->data.sequence.items.start, i = 0;
 760              item < node->data.sequence.items.top; ++item, ++i) {
 761                 yaml_node_t *n;
 762
 763                 n = yaml_document_get_node(document, *item);
 764                 scop->implications[i] = extract_implication(ctx, document, n);
 765                 if (!scop->implications[i])
 766                         return pet_scop_free(scop);
 767         }
 768
 769         return scop;
 770 }
 771
 772 static struct pet_scop *extract_scop(isl_ctx *ctx, yaml_document_t *document,
 773         yaml_node_t *node)
 774 {
 775         struct pet_scop *scop;
 776         yaml_node_pair_t * pair;
 777
 778         if (!node)
 779                 return NULL;
 780
 781         if (node->type != YAML_MAPPING_NODE)
 782                 isl_die(ctx, isl_error_invalid, "expecting mapping",
 783                         return NULL);
 784
 785         scop = pet_scop_alloc(ctx);
 786         if (!scop)
 787                 return NULL;
 788
 789         for (pair = node->data.mapping.pairs.start;
 790              pair < node->data.mapping.pairs.top; ++pair) {
 791                 yaml_node_t *key, *value;
 792
 793                 key = yaml_document_get_node(document, pair->key);
 794                 value = yaml_document_get_node(document, pair->value);
 795
 796                 if (key->type != YAML_SCALAR_NODE)
 797                         isl_die(ctx, isl_error_invalid, "expecting scalar key",
 798                                 return pet_scop_free(scop));
 799                 if (!strcmp((char *) key->data.scalar.value, "context"))
 800                         scop->context = extract_set(ctx, document, value);
 801                 if (!strcmp((char *) key->data.scalar.value, "context_value"))
 802                         scop->context_value = extract_set(ctx, document, value);
 803                 if (!strcmp((char *) key->data.scalar.value, "types"))
 804                         scop = extract_types(ctx, document, value, scop);
 805                 if (!strcmp((char *) key->data.scalar.value, "arrays"))
 806                         scop = extract_arrays(ctx, document, value, scop);
 807                 if (!strcmp((char *) key->data.scalar.value, "statements"))
 808                         scop = extract_statements(ctx, document, value, scop);
 809                 if (!strcmp((char *) key->data.scalar.value, "implications"))
 810                         scop = extract_implications(ctx, document, value, scop);
 811                 if (!scop)
 812                         return NULL;
 813         }
 814
 815         if (!scop->context_value) {
 816                 isl_space *space = isl_space_params_alloc(ctx, 0);
 817                 scop->context_value = isl_set_universe(space);
 818                 if (!scop->context_value)
 819                         return pet_scop_free(scop);
 820         }
 821
 822         return scop;
 823 }
 824
 825 /* Extract a pet_scop from the YAML description in "in".
 826  */
 827 struct pet_scop *pet_scop_parse(isl_ctx *ctx, FILE *in)
 828 {
 829         struct pet_scop *scop = NULL;
 830         yaml_parser_t parser;
 831         yaml_node_t *root;
 832         yaml_document_t document = { 0 };
 833
 834         yaml_parser_initialize(&parser);
 835
 836         yaml_parser_set_input_file(&parser, in);
 837
 838         if (!yaml_parser_load(&parser, &document))
 839                 goto error;
 840
 841         root = yaml_document_get_root_node(&document);
 842
 843         scop = extract_scop(ctx, &document, root);
 844
 845         yaml_document_delete(&document);
 846
 847         yaml_parser_delete(&parser);
 848
 849         return scop;
 850 error:
 851         yaml_parser_delete(&parser);
 852         pet_scop_free(scop);
 853         return NULL;
 854 }