nsz Git - libfirm/blob - ir/tr/entity.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief   Representation of all program known entities.
  23  * @author  Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Michael Beck
  24  * @version $Id$
  25  */
  26 #include "config.h"
  27
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <stddef.h>
  31
  32 #include "firm_common_t.h"
  33
  34 #include "xmalloc.h"
  35 #include "entity_t.h"
  36 #include "array.h"
  37 #include "irtools.h"
  38 #include "irhooks.h"
  39 #include "irprintf.h"
  40
  41 #include "irprog_t.h"
  42 #include "ircons.h"
  43 #include "tv_t.h"
  44 #include "irdump.h"
  45 #include "irgraph_t.h"
  46 #include "callgraph.h"
  47 #include "error.h"
  48
  49 /*-----------------------------------------------------------------*/
  50 /** general                                                       **/
  51 /*-----------------------------------------------------------------*/
  52
  53 ir_entity *unknown_entity = NULL;
  54
  55 ir_entity *get_unknown_entity(void) { return unknown_entity; }
  56
  57 /** The name of the unknown entity. */
  58 #define UNKNOWN_ENTITY_NAME "unknown_entity"
  59
  60 /*-----------------------------------------------------------------*/
  61 /* ENTITY                                                          */
  62 /*-----------------------------------------------------------------*/
  63
  64 /**
  65  * Add an entity to it's already set owner type.
  66  */
  67 static inline void insert_entity_in_owner(ir_entity *ent) {
  68         ir_type *owner = ent->owner;
  69         switch (get_type_tpop_code(owner)) {
  70         case tpo_class:
  71                 add_class_member(owner, ent);
  72                 break;
  73         case tpo_struct:
  74                 add_struct_member(owner, ent);
  75                 break;
  76         case tpo_union:
  77                 add_union_member(owner, ent);
  78                 break;
  79         case tpo_array:
  80                 set_array_element_entity(owner, ent);
  81                 break;
  82         default:
  83                 panic("Unsupported type kind");
  84         }
  85 }  /* insert_entity_in_owner */
  86
  87 /**
  88  * Creates a new entity. This entity is NOT inserted in the owner type.
  89  *
  90  * @param db     debug info for this entity
  91  * @param owner  the owner type of the new entity
  92  * @param name   the name of the new entity
  93  * @param type   the type of the new entity
  94  *
  95  * @return the new created entity
  96  */
  97 static inline ir_entity *
  98 new_rd_entity(dbg_info *db, ir_type *owner, ident *name, ir_type *type)
  99 {
 100         ir_entity *res;
 101         ir_graph *rem;
 102
 103         assert(!id_contains_char(name, ' ') && "entity name should not contain spaces");
 104
 105         res = XMALLOCZ(ir_entity);
 106
 107         res->kind    = k_entity;
 108         res->name    = name;
 109         res->ld_name = NULL;
 110         res->type    = type;
 111         res->owner   = owner;
 112
 113         res->allocation           = allocation_automatic;
 114         res->visibility           = visibility_local;
 115         res->volatility           = volatility_non_volatile;
 116         res->aligned              = align_is_aligned;
 117         res->stickyness           = stickyness_unsticky;
 118         res->peculiarity          = peculiarity_existent;
 119         res->usage                = ir_usage_unknown;
 120         res->final                = 0;
 121         res->compiler_gen         = 0;
 122         res->backend_marked       = 0;
 123         res->offset               = -1;
 124         res->offset_bit_remainder = 0;
 125         res->alignment            = 0;
 126         res->link                 = NULL;
 127         res->repr_class           = NULL;
 128
 129         if (is_Method_type(type)) {
 130                 symconst_symbol sym;
 131                 ir_mode *mode = is_Method_type(type) ? mode_P_code : mode_P_data;
 132                 sym.entity_p            = res;
 133                 rem                     = current_ir_graph;
 134                 current_ir_graph        = get_const_code_irg();
 135                 res->value              = new_SymConst(mode, sym, symconst_addr_ent);
 136                 current_ir_graph        = rem;
 137                 res->allocation         = allocation_static;
 138                 res->variability        = variability_constant;
 139                 res->attr.mtd_attr.irg_add_properties = mtp_property_inherited;
 140                 res->attr.mtd_attr.vtable_number      = VTABLE_NUM_NOT_SET;
 141                 res->attr.mtd_attr.param_access       = NULL;
 142                 res->attr.mtd_attr.param_weight       = NULL;
 143                 res->attr.mtd_attr.irg                = NULL;
 144         } else if (is_compound_type(type)) {
 145                 res->variability = variability_uninitialized;
 146                 res->value       = NULL;
 147                 res->attr.cmpd_attr.values    = NULL;
 148                 res->attr.cmpd_attr.val_paths = NULL;
 149         } else {
 150                 res->variability = variability_uninitialized;
 151                 res->value       = NULL;
 152         }
 153
 154         if (is_Class_type(owner)) {
 155                 res->overwrites    = NEW_ARR_F(ir_entity *, 0);
 156                 res->overwrittenby = NEW_ARR_F(ir_entity *, 0);
 157         } else {
 158                 res->overwrites    = NULL;
 159                 res->overwrittenby = NULL;
 160         }
 161
 162 #ifdef DEBUG_libfirm
 163         res->nr = get_irp_new_node_nr();
 164 #endif /* DEBUG_libfirm */
 165
 166         res->visit = 0;
 167         set_entity_dbg_info(res, db);
 168
 169         return res;
 170 }  /* new_rd_entity */
 171
 172 ir_entity *
 173 new_d_entity(ir_type *owner, ident *name, ir_type *type, dbg_info *db) {
 174         ir_entity *res;
 175
 176         assert(is_compound_type(owner));
 177         res = new_rd_entity(db, owner, name, type);
 178         /* Remember entity in it's owner. */
 179         insert_entity_in_owner(res);
 180
 181         hook_new_entity(res);
 182         return res;
 183 }  /* new_d_entity */
 184
 185 ir_entity *
 186 new_entity(ir_type *owner, ident *name, ir_type *type) {
 187         return new_d_entity(owner, name, type, NULL);
 188 }  /* new_entity */
 189
 190 /**
 191  * Free entity attributes.
 192  *
 193  * @param ent  the entity
 194  */
 195 static void free_entity_attrs(ir_entity *ent) {
 196         int i;
 197         if (get_type_tpop(get_entity_owner(ent)) == type_class) {
 198                 DEL_ARR_F(ent->overwrites);    ent->overwrites = NULL;
 199                 DEL_ARR_F(ent->overwrittenby); ent->overwrittenby = NULL;
 200         } else {
 201                 assert(ent->overwrites == NULL);
 202                 assert(ent->overwrittenby == NULL);
 203         }
 204         if (is_compound_entity(ent)) {
 205                 if (ent->has_initializer) {
 206                         /* TODO: free initializers */
 207                 } else {
 208                         if (ent->attr.cmpd_attr.val_paths) {
 209                                 for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i)
 210                                         if (ent->attr.cmpd_attr.val_paths[i]) {
 211                                                 /* free_compound_graph_path(ent->attr.cmpd_attr.val_paths[i]) ;  * @@@ warum nich? */
 212                                                 /* Geht nich: wird mehrfach verwendet!!! ==> mehrfach frei gegeben. */
 213                                                 /* DEL_ARR_F(ent->attr.cmpd_attr.val_paths); */
 214                                         }
 215                                         ent->attr.cmpd_attr.val_paths = NULL;
 216                         }
 217                         if (ent->attr.cmpd_attr.values) {
 218                                 /*DEL_ARR_F(ent->attr.cmpd_attr.values)*/;
 219                         }
 220                         ent->attr.cmpd_attr.values = NULL;
 221                 }
 222         } else if (is_method_entity(ent)) {
 223                 if (ent->attr.mtd_attr.param_access) {
 224                         DEL_ARR_F(ent->attr.mtd_attr.param_access);
 225                         ent->attr.mtd_attr.param_access = NULL;
 226                 }
 227                 if (ent->attr.mtd_attr.param_weight) {
 228                         DEL_ARR_F(ent->attr.mtd_attr.param_weight);
 229                         ent->attr.mtd_attr.param_weight = NULL;
 230                 }
 231         }
 232 }  /* free_entity_attrs */
 233
 234 /**
 235  * Creates a deep copy of an entity.
 236  */
 237 static ir_entity *deep_entity_copy(ir_entity *old)
 238 {
 239         ir_entity *newe = XMALLOC(ir_entity);
 240
 241         *newe = *old;
 242         if (is_compound_entity(old)) {
 243                 if (old->has_initializer) {
 244                         /* FIXME: the initializers are NOT copied */
 245                 } else {
 246                         newe->attr.cmpd_attr.values    = NULL;
 247                         newe->attr.cmpd_attr.val_paths = NULL;
 248                         if (old->attr.cmpd_attr.values)
 249                                 newe->attr.cmpd_attr.values = DUP_ARR_F(ir_node *, old->attr.cmpd_attr.values);
 250
 251                         /* FIXME: the compound graph paths are NOT copied */
 252                         if (old->attr.cmpd_attr.val_paths)
 253                                 newe->attr.cmpd_attr.val_paths = DUP_ARR_F(compound_graph_path *, old->attr.cmpd_attr.val_paths);
 254                 }
 255         } else if (is_method_entity(old)) {
 256                 /* do NOT copy them, reanalyze. This might be the best solution */
 257                 newe->attr.mtd_attr.param_access = NULL;
 258                 newe->attr.mtd_attr.param_weight = NULL;
 259         }
 260
 261 #ifdef DEBUG_libfirm
 262         newe->nr = get_irp_new_node_nr();
 263 #endif
 264         return newe;
 265 }
 266 /*
 267  * Copies the entity if the new_owner is different from the
 268  * owner of the old entity,  else returns the old entity.
 269  */
 270 ir_entity *
 271 copy_entity_own(ir_entity *old, ir_type *new_owner) {
 272         ir_entity *newe;
 273         assert(is_entity(old));
 274         assert(is_compound_type(new_owner));
 275         assert(get_type_state(new_owner) != layout_fixed);
 276
 277         if (old->owner == new_owner)
 278                 return old;
 279
 280         /* create a deep copy so we are safe of aliasing and double-freeing. */
 281         newe = deep_entity_copy(old);
 282         newe->owner = new_owner;
 283
 284         if (is_Class_type(new_owner)) {
 285                 newe->overwrites    = NEW_ARR_F(ir_entity *, 0);
 286                 newe->overwrittenby = NEW_ARR_F(ir_entity *, 0);
 287         }
 288
 289         insert_entity_in_owner(newe);
 290         return newe;
 291 }  /* copy_entity_own */
 292
 293 ir_entity *
 294 copy_entity_name(ir_entity *old, ident *new_name) {
 295         ir_entity *newe;
 296         assert(old && old->kind == k_entity);
 297
 298         if (old->name == new_name) return old;
 299         newe = deep_entity_copy(old);
 300         newe->name = new_name;
 301         newe->ld_name = NULL;
 302
 303         if (is_Class_type(newe->owner)) {
 304                 newe->overwrites    = DUP_ARR_F(ir_entity *, old->overwrites);
 305                 newe->overwrittenby = DUP_ARR_F(ir_entity *, old->overwrittenby);
 306         }
 307         insert_entity_in_owner(newe);
 308
 309         return newe;
 310 }  /* copy_entity_name */
 311
 312 void
 313 free_entity(ir_entity *ent) {
 314         assert(ent && ent->kind == k_entity);
 315         free_entity_attrs(ent);
 316         ent->kind = k_BAD;
 317         free(ent);
 318 }  /* free_entity */
 319
 320 /* Outputs a unique number for this node */
 321 long
 322 get_entity_nr(const ir_entity *ent) {
 323         assert(ent && ent->kind == k_entity);
 324 #ifdef DEBUG_libfirm
 325         return ent->nr;
 326 #else
 327         return (long)PTR_TO_INT(ent);
 328 #endif
 329 }  /* get_entity_nr */
 330
 331 const char *
 332 (get_entity_name)(const ir_entity *ent) {
 333         return _get_entity_name(ent);
 334 }  /* get_entity_name */
 335
 336 ident *
 337 (get_entity_ident)(const ir_entity *ent) {
 338         return _get_entity_ident(ent);
 339 }  /* get_entity_ident */
 340
 341 void
 342 (set_entity_ident)(ir_entity *ent, ident *id) {
 343         _set_entity_ident(ent, id);
 344 }  /* set_entity_ident */
 345
 346 ir_type *
 347 (get_entity_owner)(ir_entity *ent) {
 348         return _get_entity_owner(ent);
 349 }  /* get_entity_owner */
 350
 351 void
 352 set_entity_owner(ir_entity *ent, ir_type *owner) {
 353         assert(is_entity(ent));
 354         assert(is_compound_type(owner));
 355         ent->owner = owner;
 356 }  /* set_entity_owner */
 357
 358 ident *
 359 (get_entity_ld_ident)(ir_entity *ent) {
 360         return _get_entity_ld_ident(ent);
 361 }  /* get_entity_ld_ident */
 362
 363 void
 364 (set_entity_ld_ident)(ir_entity *ent, ident *ld_ident) {
 365         _set_entity_ld_ident(ent, ld_ident);
 366 }  /* set_entity_ld_ident */
 367
 368 const char *
 369 (get_entity_ld_name)(ir_entity *ent) {
 370         return _get_entity_ld_name(ent);
 371 }  /* get_entity_ld_name */
 372
 373 ir_type *
 374 (get_entity_type)(ir_entity *ent) {
 375         return _get_entity_type(ent);
 376 }  /* get_entity_type */
 377
 378 void
 379 (set_entity_type)(ir_entity *ent, ir_type *type) {
 380         _set_entity_type(ent, type);
 381 }  /* set_entity_type */
 382
 383 ir_allocation
 384 (get_entity_allocation)(const ir_entity *ent) {
 385         return _get_entity_allocation(ent);
 386 }  /* get_entity_allocation */
 387
 388 void
 389 (set_entity_allocation)(ir_entity *ent, ir_allocation al) {
 390         _set_entity_allocation(ent, al);
 391 }  /* set_entity_allocation */
 392
 393 /* return the name of the visibility */
 394 const char *get_allocation_name(ir_allocation al)
 395 {
 396 #define X(a)    case a: return #a
 397         switch (al) {
 398         X(allocation_automatic);
 399         X(allocation_parameter);
 400         X(allocation_dynamic);
 401         X(allocation_static);
 402     default: return "BAD VALUE";
 403         }
 404 #undef X
 405 }  /* get_allocation_name */
 406
 407 ir_visibility
 408 (get_entity_visibility)(const ir_entity *ent) {
 409         return _get_entity_visibility(ent);
 410 }  /* get_entity_visibility */
 411
 412 void
 413 set_entity_visibility(ir_entity *ent, ir_visibility vis) {
 414         assert(ent && ent->kind == k_entity);
 415         if (vis != visibility_local)
 416                 assert((ent->allocation == allocation_static) ||
 417                 (ent->allocation == allocation_automatic));
 418                 /* @@@ Test that the owner type is not local, but how??
 419         && get_class_visibility(get_entity_owner(ent)) != local));*/
 420         ent->visibility = vis;
 421 }  /* set_entity_visibility */
 422
 423 /* return the name of the visibility */
 424 const char *get_visibility_name(ir_visibility vis)
 425 {
 426 #define X(a)    case a: return #a
 427         switch (vis) {
 428         X(visibility_local);
 429         X(visibility_external_visible);
 430         X(visibility_external_allocated);
 431     default: return "BAD VALUE";
 432         }
 433 #undef X
 434 }  /* get_visibility_name */
 435
 436 ir_variability
 437 (get_entity_variability)(const ir_entity *ent) {
 438         return _get_entity_variability(ent);
 439 }  /* get_entity_variability */
 440
 441 void
 442 set_entity_variability(ir_entity *ent, ir_variability var)
 443 {
 444         assert(ent && ent->kind == k_entity);
 445         if (var == variability_part_constant)
 446                 assert(is_Class_type(ent->type) || is_Struct_type(ent->type));
 447
 448         if ((is_compound_type(ent->type)) &&
 449                 (ent->variability == variability_uninitialized) && (var != variability_uninitialized)) {
 450                 /* Allocate data structures for constant values */
 451                 ent->attr.cmpd_attr.values    = NEW_ARR_F(ir_node *, 0);
 452                 ent->attr.cmpd_attr.val_paths = NEW_ARR_F(compound_graph_path *, 0);
 453         }
 454         if ((is_atomic_type(ent->type)) &&
 455                 (ent->variability == variability_uninitialized) && (var != variability_uninitialized)) {
 456                 /* Set default constant value. */
 457                 ent->value = new_r_Unknown(get_const_code_irg(), get_type_mode(ent->type));
 458         }
 459
 460         if ((is_compound_type(ent->type)) &&
 461                 (var == variability_uninitialized) && (ent->variability != variability_uninitialized)) {
 462                 /* Free data structures for constant values */
 463                 DEL_ARR_F(ent->attr.cmpd_attr.values);    ent->attr.cmpd_attr.values    = NULL;
 464                 DEL_ARR_F(ent->attr.cmpd_attr.val_paths); ent->attr.cmpd_attr.val_paths = NULL;
 465         }
 466         ent->variability = var;
 467 }  /* set_entity_variability */
 468
 469 /* return the name of the variability */
 470 const char *get_variability_name(ir_variability var)
 471 {
 472 #define X(a)    case a: return #a
 473         switch (var) {
 474         X(variability_uninitialized);
 475         X(variability_initialized);
 476         X(variability_part_constant);
 477         X(variability_constant);
 478     default: return "BAD VALUE";
 479         }
 480 #undef X
 481 }  /* get_variability_name */
 482
 483 ir_volatility
 484 (get_entity_volatility)(const ir_entity *ent) {
 485         return _get_entity_volatility(ent);
 486 }  /* get_entity_volatility */
 487
 488 void
 489 (set_entity_volatility)(ir_entity *ent, ir_volatility vol) {
 490         _set_entity_volatility(ent, vol);
 491 }  /* set_entity_volatility */
 492
 493 /* Return the name of the volatility. */
 494 const char *get_volatility_name(ir_volatility var)
 495 {
 496 #define X(a)    case a: return #a
 497         switch (var) {
 498         X(volatility_non_volatile);
 499         X(volatility_is_volatile);
 500     default: return "BAD VALUE";
 501         }
 502 #undef X
 503 }  /* get_volatility_name */
 504
 505 ir_align
 506 (get_entity_aligned)(const ir_entity *ent) {
 507         return _get_entity_aligned(ent);
 508 }
 509
 510 void
 511 (set_entity_aligned)(ir_entity *ent, ir_align a) {
 512         _set_entity_aligned(ent, a);
 513 }
 514
 515 unsigned
 516 (get_entity_alignment)(const ir_entity *ent) {
 517         return _get_entity_alignment(ent);
 518 }
 519
 520 void
 521 (set_entity_alignment)(ir_entity *ent, unsigned alignment) {
 522         _set_entity_alignment(ent, alignment);
 523 }
 524
 525 /* Return the name of the alignment. */
 526 const char *get_align_name(ir_align a)
 527 {
 528 #define X(a)    case a: return #a
 529         switch (a) {
 530         X(align_non_aligned);
 531         X(align_is_aligned);
 532         default: return "BAD VALUE";
 533         }
 534 #undef X
 535 }  /* get_align_name */
 536
 537 ir_peculiarity
 538 (get_entity_peculiarity)(const ir_entity *ent) {
 539         return _get_entity_peculiarity(ent);
 540 }  /* get_entity_peculiarity */
 541
 542 void
 543 (set_entity_peculiarity)(ir_entity *ent, ir_peculiarity pec) {
 544         _set_entity_peculiarity(ent, pec);
 545 }  /* set_entity_peculiarity */
 546
 547 /* Checks if an entity cannot be overridden anymore. */
 548 int (is_entity_final)(const ir_entity *ent) {
 549         return _is_entity_final(ent);
 550 }  /* is_entity_final */
 551
 552 /* Sets/resets the final flag of an entity. */
 553 void (set_entity_final)(ir_entity *ent, int final) {
 554         _set_entity_final(ent, final);
 555 }  /* set_entity_final */
 556
 557 /* Checks if an entity is compiler generated */
 558 int (is_entity_compiler_generated)(const ir_entity *ent) {
 559         return _is_entity_compiler_generated(ent);
 560 }  /* is_entity_compiler_generated */
 561
 562 /* Sets/resets the compiler generated flag */
 563 void (set_entity_compiler_generated)(ir_entity *ent, int flag) {
 564         _set_entity_compiler_generated(ent, flag);
 565 }  /* set_entity_compiler_generated */
 566
 567 /* Checks if an entity is marked by the backend */
 568 int (is_entity_backend_marked)(const ir_entity *ent) {
 569         return _is_entity_backend_marked(ent);
 570 }  /* is_entity_backend_marked */
 571
 572 /* Sets/resets the compiler generated flag */
 573 void (set_entity_backend_marked)(ir_entity *ent, int flag) {
 574         _set_entity_backend_marked(ent, flag);
 575 }  /* set_entity_backend_marked */
 576
 577 ir_entity_usage (get_entity_usage)(const ir_entity *ent) {
 578         return _get_entity_usage(ent);
 579 }
 580
 581 void (set_entity_usage)(ir_entity *ent, ir_entity_usage flags) {
 582         _set_entity_usage(ent, flags);
 583 }
 584
 585 /* Get the entity's stickyness */
 586 ir_stickyness
 587 (get_entity_stickyness)(const ir_entity *ent) {
 588         return _get_entity_stickyness(ent);
 589 }  /* get_entity_stickyness */
 590
 591 /* Set the entity's stickyness */
 592 void
 593 (set_entity_stickyness)(ir_entity *ent, ir_stickyness stickyness) {
 594         _set_entity_stickyness(ent, stickyness);
 595 }  /* set_entity_stickyness */
 596
 597 /* Set has no effect for existent entities of type method. */
 598 ir_node *
 599 get_atomic_ent_value(ir_entity *ent)
 600 {
 601         assert(ent && is_atomic_entity(ent));
 602         assert(ent->variability != variability_uninitialized);
 603         return skip_Id(ent->value);
 604 }  /* get_atomic_ent_value */
 605
 606 void
 607 set_atomic_ent_value(ir_entity *ent, ir_node *val) {
 608         assert(is_atomic_entity(ent) && (ent->variability != variability_uninitialized));
 609         if (is_Method_type(ent->type) && (ent->peculiarity == peculiarity_existent))
 610                 return;
 611         assert(is_Dummy(val) || get_irn_mode(val) == get_type_mode(ent->type));
 612         ent->value = val;
 613 }  /* set_atomic_ent_value */
 614
 615 /* Returns true if the the node is representable as code on
 616  *  const_code_irg. */
 617 int is_irn_const_expression(ir_node *n) {
 618         ir_mode *m;
 619
 620         /* we are in danger iff an exception will arise. TODO: be more precisely,
 621          * for instance Div. will NOT rise if divisor != 0
 622          */
 623         if (is_binop(n) && !is_fragile_op(n))
 624                 return is_irn_const_expression(get_binop_left(n)) && is_irn_const_expression(get_binop_right(n));
 625
 626         m = get_irn_mode(n);
 627         switch (get_irn_opcode(n)) {
 628         case iro_Const:
 629         case iro_SymConst:
 630         case iro_Unknown:
 631                 return 1;
 632         case iro_Conv:
 633         case iro_Cast:
 634                 return is_irn_const_expression(get_irn_n(n, 0));
 635         default:
 636                 break;
 637         }
 638         return 0;
 639 }  /* is_irn_const_expression */
 640
 641 /*
 642  * Copies a firm subgraph that complies to the restrictions for
 643  * constant expressions to current_block in current_ir_graph.
 644  */
 645 ir_node *copy_const_value(dbg_info *dbg, ir_node *n) {
 646         ir_node *nn;
 647         ir_mode *m;
 648
 649         /* @@@ GL I think  we should implement this using the routines from irgopt for
 650                dead node elimination/inlineing. */
 651
 652         m = get_irn_mode(n);
 653         switch (get_irn_opcode(n)) {
 654         case iro_Const:
 655                 nn = new_d_Const_type(dbg, get_Const_tarval(n), get_Const_type(n));
 656                 break;
 657         case iro_SymConst:
 658                 nn = new_d_SymConst_type(dbg, get_irn_mode(n), get_SymConst_symbol(n), get_SymConst_kind(n),
 659                         get_SymConst_value_type(n));
 660                 break;
 661         case iro_Add:
 662                 nn = new_d_Add(dbg, copy_const_value(dbg, get_Add_left(n)),
 663                         copy_const_value(dbg, get_Add_right(n)), m); break;
 664         case iro_Sub:
 665                 nn = new_d_Sub(dbg, copy_const_value(dbg, get_Sub_left(n)),
 666                         copy_const_value(dbg, get_Sub_right(n)), m); break;
 667         case iro_Mul:
 668                 nn = new_d_Mul(dbg, copy_const_value(dbg, get_Mul_left(n)),
 669                         copy_const_value(dbg, get_Mul_right(n)), m); break;
 670         case iro_And:
 671                 nn = new_d_And(dbg, copy_const_value(dbg, get_And_left(n)),
 672                         copy_const_value(dbg, get_And_right(n)), m); break;
 673         case iro_Or:
 674                 nn = new_d_Or(dbg, copy_const_value(dbg, get_Or_left(n)),
 675                         copy_const_value(dbg, get_Or_right(n)), m); break;
 676         case iro_Eor:
 677                 nn = new_d_Eor(dbg, copy_const_value(dbg, get_Eor_left(n)),
 678                         copy_const_value(dbg, get_Eor_right(n)), m); break;
 679         case iro_Cast:
 680                 nn = new_d_Cast(dbg, copy_const_value(dbg, get_Cast_op(n)), get_Cast_type(n)); break;
 681         case iro_Conv:
 682                 nn = new_d_Conv(dbg, copy_const_value(dbg, get_Conv_op(n)), m); break;
 683         case iro_Unknown:
 684                 nn = new_Unknown(m); break;
 685         default:
 686                 assert(0 && "opcode invalid or not implemented");
 687                 nn = NULL;
 688                 break;
 689         }
 690         return nn;
 691 }  /* copy_const_value */
 692
 693 /** Return the name of the initializer kind. */
 694 const char *get_initializer_kind_name(ir_initializer_kind_t ini)
 695 {
 696 #define X(a)    case a: return #a
 697         switch (ini) {
 698         X(IR_INITIALIZER_CONST);
 699         X(IR_INITIALIZER_TARVAL);
 700         X(IR_INITIALIZER_NULL);
 701         X(IR_INITIALIZER_COMPOUND);
 702     default: return "BAD VALUE";
 703         }
 704 #undef X
 705 }
 706
 707 static ir_initializer_t null_initializer = { IR_INITIALIZER_NULL };
 708
 709 ir_initializer_t *get_initializer_null(void)
 710 {
 711         return &null_initializer;
 712 }
 713
 714 ir_initializer_t *create_initializer_const(ir_node *value)
 715 {
 716         struct obstack *obst = get_irg_obstack(get_const_code_irg());
 717
 718         ir_initializer_t *initializer
 719                 = obstack_alloc(obst, sizeof(ir_initializer_const_t));
 720         initializer->kind         = IR_INITIALIZER_CONST;
 721         initializer->consti.value = value;
 722
 723         return initializer;
 724 }
 725
 726 ir_initializer_t *create_initializer_tarval(tarval *tv)
 727 {
 728         struct obstack *obst = get_irg_obstack(get_const_code_irg());
 729
 730         ir_initializer_t *initializer
 731                 = obstack_alloc(obst, sizeof(ir_initializer_tarval_t));
 732         initializer->kind         = IR_INITIALIZER_TARVAL;
 733         initializer->tarval.value = tv;
 734
 735         return initializer;
 736 }
 737
 738 ir_initializer_t *create_initializer_compound(unsigned n_entries)
 739 {
 740         struct obstack *obst = get_irg_obstack(get_const_code_irg());
 741
 742         size_t i;
 743         size_t size  = sizeof(ir_initializer_compound_t)
 744                      + (n_entries-1) * sizeof(ir_initializer_t*);
 745
 746         ir_initializer_t *initializer = obstack_alloc(obst, size);
 747         initializer->kind                    = IR_INITIALIZER_COMPOUND;
 748         initializer->compound.n_initializers = n_entries;
 749
 750         for(i = 0; i < n_entries; ++i) {
 751                 initializer->compound.initializers[i] = get_initializer_null();
 752         }
 753
 754         return initializer;
 755 }
 756
 757 ir_node *get_initializer_const_value(const ir_initializer_t *initializer)
 758 {
 759         assert(initializer->kind == IR_INITIALIZER_CONST);
 760         return skip_Id(initializer->consti.value);
 761 }
 762
 763 tarval *get_initializer_tarval_value(const ir_initializer_t *initializer)
 764 {
 765         assert(initializer->kind == IR_INITIALIZER_TARVAL);
 766         return initializer->tarval.value;
 767 }
 768
 769 unsigned get_initializer_compound_n_entries(const ir_initializer_t *initializer)
 770 {
 771         assert(initializer->kind == IR_INITIALIZER_COMPOUND);
 772         return initializer->compound.n_initializers;
 773 }
 774
 775 void set_initializer_compound_value(ir_initializer_t *initializer,
 776                                     unsigned index, ir_initializer_t *value)
 777 {
 778         assert(initializer->kind == IR_INITIALIZER_COMPOUND);
 779         assert(index < initializer->compound.n_initializers);
 780
 781         initializer->compound.initializers[index] = value;
 782 }
 783
 784 ir_initializer_t *get_initializer_compound_value(
 785                 const ir_initializer_t *initializer, unsigned index)
 786 {
 787         assert(initializer->kind == IR_INITIALIZER_COMPOUND);
 788         assert(index < initializer->compound.n_initializers);
 789
 790         return initializer->compound.initializers[index];
 791 }
 792
 793 ir_initializer_kind_t get_initializer_kind(const ir_initializer_t *initializer)
 794 {
 795         return initializer->kind;
 796 }
 797
 798 static void check_entity_initializer(ir_entity *entity)
 799 {
 800         /* TODO */
 801         (void) entity;
 802 }
 803
 804 void set_entity_initializer(ir_entity *entity, ir_initializer_t *initializer)
 805 {
 806         entity->attr.initializer = initializer;
 807         entity->has_initializer  = 1;
 808         check_entity_initializer(entity);
 809 }
 810
 811 int has_entity_initializer(const ir_entity *entity)
 812 {
 813         return entity->has_initializer;
 814 }
 815
 816 ir_initializer_t *get_entity_initializer(const ir_entity *entity)
 817 {
 818         assert(entity->has_initializer);
 819         return entity->attr.initializer;
 820 }
 821
 822 /* Creates a new compound graph path. */
 823 compound_graph_path *
 824 new_compound_graph_path(ir_type *tp, int length) {
 825         compound_graph_path *res;
 826
 827         assert(is_compound_type(tp));
 828         assert(length > 0);
 829
 830         res = xmalloc(sizeof(*res) + (length-1) * sizeof(res->list[0]));
 831         memset(res, 0, sizeof(*res) + (length-1) * sizeof(res->list[0]));
 832         res->kind         = k_ir_compound_graph_path;
 833         res->tp           = tp;
 834         res->len          = length;
 835
 836         return res;
 837 }  /* new_compound_graph_path */
 838
 839 /* Frees an graph path object */
 840 void free_compound_graph_path (compound_graph_path *gr) {
 841         assert(gr && is_compound_graph_path(gr));
 842         gr->kind = k_BAD;
 843         free(gr);
 844 }  /* free_compound_graph_path */
 845
 846 /* Returns non-zero if an object is a compound graph path */
 847 int is_compound_graph_path(const void *thing) {
 848         return (get_kind(thing) == k_ir_compound_graph_path);
 849 }  /* is_compound_graph_path */
 850
 851 /* Checks whether the path up to pos is correct. If the path contains a NULL,
 852  *  assumes the path is not complete and returns 'true'. */
 853 int is_proper_compound_graph_path(compound_graph_path *gr, int pos) {
 854         int i;
 855         ir_entity *node;
 856         ir_type *owner = gr->tp;
 857
 858         for (i = 0; i <= pos; i++) {
 859                 node = get_compound_graph_path_node(gr, i);
 860                 if (node == NULL)
 861                         /* Path not yet complete. */
 862                         return 1;
 863                 if (get_entity_owner(node) != owner)
 864                         return 0;
 865                 owner = get_entity_type(node);
 866         }
 867         if (pos == get_compound_graph_path_length(gr))
 868                 if (!is_atomic_type(owner))
 869                         return 0;
 870                 return 1;
 871 }  /* is_proper_compound_graph_path */
 872
 873 /* Returns the length of a graph path */
 874 int get_compound_graph_path_length(const compound_graph_path *gr) {
 875         assert(gr && is_compound_graph_path(gr));
 876         return gr->len;
 877 }  /* get_compound_graph_path_length */
 878
 879 ir_entity *
 880 get_compound_graph_path_node(const compound_graph_path *gr, int pos) {
 881         assert(gr && is_compound_graph_path(gr));
 882         assert(pos >= 0 && pos < gr->len);
 883         return gr->list[pos].node;
 884 }  /* get_compound_graph_path_node */
 885
 886 void
 887 set_compound_graph_path_node(compound_graph_path *gr, int pos, ir_entity *node) {
 888         assert(gr && is_compound_graph_path(gr));
 889         assert(pos >= 0 && pos < gr->len);
 890         assert(is_entity(node));
 891         gr->list[pos].node = node;
 892         assert(is_proper_compound_graph_path(gr, pos));
 893 }  /* set_compound_graph_path_node */
 894
 895 int
 896 get_compound_graph_path_array_index(const compound_graph_path *gr, int pos) {
 897         assert(gr && is_compound_graph_path(gr));
 898         assert(pos >= 0 && pos < gr->len);
 899         return gr->list[pos].index;
 900 }  /* get_compound_graph_path_array_index */
 901
 902 void
 903 set_compound_graph_path_array_index(compound_graph_path *gr, int pos, int index) {
 904         assert(gr && is_compound_graph_path(gr));
 905         assert(pos >= 0 && pos < gr->len);
 906         gr->list[pos].index = index;
 907 }  /* set_compound_graph_path_array_index */
 908
 909 ir_type *
 910 get_compound_graph_path_type(const compound_graph_path *gr) {
 911         assert(gr && is_compound_graph_path(gr));
 912         return gr->tp;
 913 }
 914
 915 /* A value of a compound entity is a pair of value and the corresponding path to a member of
 916    the compound. */
 917 void
 918 add_compound_ent_value_w_path(ir_entity *ent, ir_node *val, compound_graph_path *path) {
 919         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
 920         assert(is_compound_graph_path(path));
 921         ARR_APP1(ir_node *, ent->attr.cmpd_attr.values, val);
 922         ARR_APP1(compound_graph_path *, ent->attr.cmpd_attr.val_paths, path);
 923 }  /* add_compound_ent_value_w_path */
 924
 925 void
 926 set_compound_ent_value_w_path(ir_entity *ent, ir_node *val, compound_graph_path *path, int pos) {
 927         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
 928         assert(is_compound_graph_path(path));
 929         assert(0 <= pos && pos < ARR_LEN(ent->attr.cmpd_attr.values));
 930         ent->attr.cmpd_attr.values[pos]    = val;
 931         ent->attr.cmpd_attr.val_paths[pos] = path;
 932 }  /* set_compound_ent_value_w_path */
 933
 934 int
 935 get_compound_ent_n_values(ir_entity *ent) {
 936         assert(!ent->has_initializer);
 937         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
 938         return ARR_LEN(ent->attr.cmpd_attr.values);
 939 }  /* get_compound_ent_n_values */
 940
 941 ir_node *
 942 get_compound_ent_value(ir_entity *ent, int pos) {
 943         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
 944         assert(!ent->has_initializer);
 945         assert(0 <= pos && pos < ARR_LEN(ent->attr.cmpd_attr.values));
 946         return skip_Id(ent->attr.cmpd_attr.values[pos]);
 947 }  /* get_compound_ent_value */
 948
 949 compound_graph_path *
 950 get_compound_ent_value_path(ir_entity *ent, int pos) {
 951         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
 952         assert(!ent->has_initializer);
 953         assert(0 <= pos && pos < ARR_LEN(ent->attr.cmpd_attr.val_paths));
 954         return ent->attr.cmpd_attr.val_paths[pos];
 955 }  /* get_compound_ent_value_path */
 956
 957 /**
 958  * Returns non-zero, if two compound_graph_pathes are equal
 959  *
 960  * @param path1            the first path
 961  * @param path2            the second path
 962  */
 963 static int equal_paths(compound_graph_path *path1, compound_graph_path *path2) {
 964         int i;
 965         int len1 = get_compound_graph_path_length(path1);
 966         int len2 = get_compound_graph_path_length(path2);
 967
 968         if (len2 != len1) return 0;
 969
 970         for (i = 0; i < len1; i++) {
 971                 ir_type *tp;
 972                 ir_entity *node1 = get_compound_graph_path_node(path1, i);
 973                 ir_entity *node2 = get_compound_graph_path_node(path2, i);
 974
 975                 if (node1 != node2) return 0;
 976
 977                 tp = get_entity_owner(node1);
 978                 if (is_Array_type(tp)) {
 979                         int index1 = get_compound_graph_path_array_index(path1, i);
 980                         int index2 = get_compound_graph_path_array_index(path2, i);
 981                         if (index1 != index2)
 982                                 return 0;
 983                 }
 984         }
 985         return 1;
 986 }  /* equal_paths */
 987
 988 /**
 989  * Returns the position of a value with the given path.
 990  * The path must contain array indices for all array element entities.
 991  *
 992  * @todo  This implementation is very slow (O(number of initializers * |path|)
 993  *        and should be replaced when the new tree oriented
 994  *        value representation is finally implemented.
 995  */
 996 static int get_compound_ent_pos_by_path(ir_entity *ent, compound_graph_path *path) {
 997         int i, n_paths = get_compound_ent_n_values(ent);
 998
 999         for (i = 0; i < n_paths; i ++) {
1000                 compound_graph_path *gr = get_compound_ent_value_path(ent, i);
1001                 if (equal_paths(gr, path))
1002                         return i;
1003         }
1004         return -1;
1005 }  /* get_compound_ent_pos_by_path */
1006
1007 /* Returns a constant value given the access path.
1008  *  The path must contain array indices for all array element entities. */
1009 ir_node *get_compound_ent_value_by_path(ir_entity *ent, compound_graph_path *path) {
1010         int pos = get_compound_ent_pos_by_path(ent, path);
1011         if (pos >= 0)
1012                 return get_compound_ent_value(ent, pos);
1013         return NULL;
1014 }  /* get_compound_ent_value_by_path */
1015
1016
1017 void
1018 remove_compound_ent_value(ir_entity *ent, ir_entity *value_ent) {
1019         int i, n;
1020         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
1021
1022         n = ARR_LEN(ent->attr.cmpd_attr.val_paths);
1023         for (i = 0; i < n; ++i) {
1024                 compound_graph_path *path = ent->attr.cmpd_attr.val_paths[i];
1025                 if (path->list[path->len-1].node == value_ent) {
1026                         for (; i < n - 1; ++i) {
1027                                 ent->attr.cmpd_attr.val_paths[i] = ent->attr.cmpd_attr.val_paths[i+1];
1028                                 ent->attr.cmpd_attr.values[i]    = ent->attr.cmpd_attr.values[i+1];
1029                         }
1030                         ARR_SETLEN(ir_entity*, ent->attr.cmpd_attr.val_paths, n - 1);
1031                         ARR_SETLEN(ir_node*,   ent->attr.cmpd_attr.values,    n - 1);
1032                         break;
1033                 }
1034         }
1035 }  /* remove_compound_ent_value */
1036
1037 void
1038 add_compound_ent_value(ir_entity *ent, ir_node *val, ir_entity *member) {
1039         compound_graph_path *path;
1040         ir_type *owner_tp = get_entity_owner(member);
1041         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
1042         path = new_compound_graph_path(get_entity_type(ent), 1);
1043         path->list[0].node = member;
1044         if (is_Array_type(owner_tp)) {
1045                 int max;
1046                 int i, n;
1047
1048                 assert(get_array_n_dimensions(owner_tp) == 1 && has_array_lower_bound(owner_tp, 0));
1049                 max = get_array_lower_bound_int(owner_tp, 0) -1;
1050                 for (i = 0, n = get_compound_ent_n_values(ent); i < n; ++i) {
1051                         int index = get_compound_graph_path_array_index(get_compound_ent_value_path(ent, i), 0);
1052                         if (index > max) {
1053                                 max = index;
1054                         }
1055                 }
1056                 path->list[0].index = max + 1;
1057         }
1058         add_compound_ent_value_w_path(ent, val, path);
1059 }  /* add_compound_ent_value */
1060
1061
1062 ir_entity *
1063 get_compound_ent_value_member(ir_entity *ent, int pos) {
1064         compound_graph_path *path;
1065         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
1066         path = get_compound_ent_value_path(ent, pos);
1067
1068         return get_compound_graph_path_node(path, get_compound_graph_path_length(path)-1);
1069 }  /* get_compound_ent_value_member */
1070
1071 void
1072 set_compound_ent_value(ir_entity *ent, ir_node *val, ir_entity *member, int pos) {
1073         compound_graph_path *path;
1074         assert(is_compound_entity(ent) && (ent->variability != variability_uninitialized));
1075         path = get_compound_ent_value_path(ent, pos);
1076         set_compound_graph_path_node(path, 0, member);
1077         set_compound_ent_value_w_path(ent, val, path, pos);
1078 }  /* set_compound_ent_value */
1079
1080 void
1081 set_array_entity_values(ir_entity *ent, tarval **values, int num_vals) {
1082         int i;
1083         ir_graph *rem = current_ir_graph;
1084         ir_type *arrtp = get_entity_type(ent);
1085         ir_node *val;
1086         ir_type *elttp = get_array_element_type(arrtp);
1087
1088         assert(is_Array_type(arrtp));
1089         assert(get_array_n_dimensions(arrtp) == 1);
1090         /* One bound is sufficient, the number of constant fields makes the
1091            size. */
1092         assert(get_array_lower_bound (arrtp, 0) || get_array_upper_bound (arrtp, 0));
1093         assert(get_entity_variability(ent) != variability_uninitialized);
1094         current_ir_graph = get_const_code_irg();
1095
1096         for (i = 0; i < num_vals; i++) {
1097                 val = new_Const_type(values[i], elttp);
1098                 add_compound_ent_value(ent, val, get_array_element_entity(arrtp));
1099                 set_compound_graph_path_array_index(get_compound_ent_value_path(ent, i), 0, i);
1100         }
1101         current_ir_graph = rem;
1102 }  /* set_array_entity_values */
1103
1104 /* Return the overall offset of value at position pos in bytes. */
1105 unsigned get_compound_ent_value_offset_bytes(ir_entity *ent, int pos) {
1106         compound_graph_path *path;
1107         int path_len, i;
1108         unsigned offset = 0;
1109         ir_type *curr_tp;
1110
1111         assert(get_type_state(get_entity_type(ent)) == layout_fixed);
1112
1113         path     = get_compound_ent_value_path(ent, pos);
1114         path_len = get_compound_graph_path_length(path);
1115         curr_tp  = path->tp;
1116
1117         for (i = 0; i < path_len; ++i) {
1118                 if (is_Array_type(curr_tp)) {
1119                         ir_type *elem_type = get_array_element_type(curr_tp);
1120                         unsigned size      = get_type_size_bytes(elem_type);
1121                         unsigned align     = get_type_alignment_bytes(elem_type);
1122                         int      idx;
1123
1124                         assert(size > 0);
1125                         if(size % align > 0) {
1126                                 size += align - (size % align);
1127                         }
1128                         idx = get_compound_graph_path_array_index(path, i);
1129                         assert(idx >= 0);
1130                         offset += size * idx;
1131                         curr_tp = elem_type;
1132                 } else {
1133                         ir_entity *node = get_compound_graph_path_node(path, i);
1134                         offset += get_entity_offset(node);
1135                         curr_tp = get_entity_type(node);
1136                 }
1137         }
1138
1139         return offset;
1140 }  /* get_compound_ent_value_offset_bytes */
1141
1142 /* Return the offset in bits from the last byte address. */
1143 unsigned get_compound_ent_value_offset_bit_remainder(ir_entity *ent, int pos) {
1144         compound_graph_path *path;
1145         int path_len;
1146         ir_entity *last_node;
1147
1148         assert(get_type_state(get_entity_type(ent)) == layout_fixed);
1149
1150         path      = get_compound_ent_value_path(ent, pos);
1151         path_len  = get_compound_graph_path_length(path);
1152         last_node = get_compound_graph_path_node(path, path_len - 1);
1153
1154         if(last_node == NULL)
1155                 return 0;
1156
1157         return get_entity_offset_bits_remainder(last_node);
1158 }  /* get_compound_ent_value_offset_bit_remainder */
1159
1160 int
1161 (get_entity_offset)(const ir_entity *ent) {
1162         return _get_entity_offset(ent);
1163 }  /* get_entity_offset */
1164
1165 void
1166 (set_entity_offset)(ir_entity *ent, int offset) {
1167         _set_entity_offset(ent, offset);
1168 }  /* set_entity_offset */
1169
1170 unsigned char
1171 (get_entity_offset_bits_remainder)(const ir_entity *ent) {
1172         return _get_entity_offset_bits_remainder(ent);
1173 }  /* get_entity_offset_bits_remainder */
1174
1175 void
1176 (set_entity_offset_bits_remainder)(ir_entity *ent, unsigned char offset) {
1177         _set_entity_offset_bits_remainder(ent, offset);
1178 }  /* set_entity_offset_bits_remainder */
1179
1180 void
1181 add_entity_overwrites(ir_entity *ent, ir_entity *overwritten) {
1182 #ifndef NDEBUG
1183         ir_type *owner     = get_entity_owner(ent);
1184         ir_type *ovw_ovner = get_entity_owner(overwritten);
1185         assert(is_Class_type(owner));
1186         assert(is_Class_type(ovw_ovner));
1187         assert(! is_class_final(ovw_ovner));
1188 #endif /* NDEBUG */
1189         ARR_APP1(ir_entity *, ent->overwrites, overwritten);
1190         ARR_APP1(ir_entity *, overwritten->overwrittenby, ent);
1191 }  /* add_entity_overwrites */
1192
1193 int
1194 get_entity_n_overwrites(ir_entity *ent) {
1195         assert(is_Class_type(get_entity_owner(ent)));
1196         return (ARR_LEN(ent->overwrites));
1197 }  /* get_entity_n_overwrites */
1198
1199 int
1200 get_entity_overwrites_index(ir_entity *ent, ir_entity *overwritten) {
1201         int i, n;
1202         assert(is_Class_type(get_entity_owner(ent)));
1203         n = get_entity_n_overwrites(ent);
1204         for (i = 0; i < n; ++i) {
1205                 if (get_entity_overwrites(ent, i) == overwritten)
1206                         return i;
1207         }
1208         return -1;
1209 }  /* get_entity_overwrites_index */
1210
1211 ir_entity *
1212 get_entity_overwrites(ir_entity *ent, int pos) {
1213         assert(is_Class_type(get_entity_owner(ent)));
1214         assert(pos < get_entity_n_overwrites(ent));
1215         return ent->overwrites[pos];
1216 }  /* get_entity_overwrites */
1217
1218 void
1219 set_entity_overwrites(ir_entity *ent, int pos, ir_entity *overwritten) {
1220         assert(is_Class_type(get_entity_owner(ent)));
1221         assert(pos < get_entity_n_overwrites(ent));
1222         ent->overwrites[pos] = overwritten;
1223 }  /* set_entity_overwrites */
1224
1225 void
1226 remove_entity_overwrites(ir_entity *ent, ir_entity *overwritten) {
1227         int i, n;
1228         assert(is_Class_type(get_entity_owner(ent)));
1229         n = ARR_LEN(ent->overwrites);
1230         for (i = 0; i < n; ++i) {
1231                 if (ent->overwrites[i] == overwritten) {
1232                         for (; i < n - 1; i++)
1233                                 ent->overwrites[i] = ent->overwrites[i+1];
1234                         ARR_SETLEN(ir_entity*, ent->overwrites, n - 1);
1235                         break;
1236                 }
1237         }
1238 }  /* remove_entity_overwrites */
1239
1240 void
1241 add_entity_overwrittenby(ir_entity *ent, ir_entity *overwrites) {
1242         add_entity_overwrites(overwrites, ent);
1243 }  /* add_entity_overwrittenby */
1244
1245 int
1246 get_entity_n_overwrittenby(ir_entity *ent) {
1247         assert(is_Class_type(get_entity_owner(ent)));
1248         return ARR_LEN(ent->overwrittenby);
1249 }  /* get_entity_n_overwrittenby */
1250
1251 int
1252 get_entity_overwrittenby_index(ir_entity *ent, ir_entity *overwrites) {
1253         int i, n;
1254         assert(is_Class_type(get_entity_owner(ent)));
1255         n = get_entity_n_overwrittenby(ent);
1256         for (i = 0; i < n; ++i) {
1257                 if (get_entity_overwrittenby(ent, i) == overwrites)
1258                         return i;
1259         }
1260         return -1;
1261 }  /* get_entity_overwrittenby_index */
1262
1263 ir_entity *
1264 get_entity_overwrittenby(ir_entity *ent, int pos) {
1265         assert(is_Class_type(get_entity_owner(ent)));
1266         assert(pos < get_entity_n_overwrittenby(ent));
1267         return ent->overwrittenby[pos];
1268 }  /* get_entity_overwrittenby */
1269
1270 void
1271 set_entity_overwrittenby(ir_entity *ent, int pos, ir_entity *overwrites) {
1272         assert(is_Class_type(get_entity_owner(ent)));
1273         assert(pos < get_entity_n_overwrittenby(ent));
1274         ent->overwrittenby[pos] = overwrites;
1275 }  /* set_entity_overwrittenby */
1276
1277 void remove_entity_overwrittenby(ir_entity *ent, ir_entity *overwrites) {
1278         int i, n;
1279         assert(is_Class_type(get_entity_owner(ent)));
1280
1281         n = ARR_LEN(ent->overwrittenby);
1282         for (i = 0; i < n; ++i) {
1283                 if (ent->overwrittenby[i] == overwrites) {
1284                         for(; i < n - 1; ++i)
1285                                 ent->overwrittenby[i] = ent->overwrittenby[i+1];
1286                         ARR_SETLEN(ir_entity*, ent->overwrittenby, n - 1);
1287                         break;
1288                 }
1289         }
1290 }  /* remove_entity_overwrittenby */
1291
1292 /* A link to store intermediate information */
1293 void *
1294 (get_entity_link)(const ir_entity *ent) {
1295         return _get_entity_link(ent);
1296 }  /* get_entity_link */
1297
1298 void
1299 (set_entity_link)(ir_entity *ent, void *l) {
1300         _set_entity_link(ent, l);
1301 }  /* set_entity_link */
1302
1303 ir_graph *
1304 (get_entity_irg)(const ir_entity *ent) {
1305         return _get_entity_irg(ent);
1306 }  /* get_entity_irg */
1307
1308 void
1309 set_entity_irg(ir_entity *ent, ir_graph *irg) {
1310         assert(is_method_entity(ent));
1311         /* Wie kann man die Referenz auf einen IRG löschen, z.B. wenn die
1312          * Methode selbst nicht mehr aufgerufen werden kann, die Entität
1313          * aber erhalten bleiben soll?  Wandle die Entitaet in description oder
1314          * inherited um! */
1315         /* assert(irg); */
1316         assert((irg  && ent->peculiarity == peculiarity_existent) ||
1317                 (!irg && (ent->peculiarity == peculiarity_existent)
1318                 && (ent -> visibility == visibility_external_allocated)) ||
1319                 (!irg && ent->peculiarity == peculiarity_description) ||
1320                 (!irg && ent->peculiarity == peculiarity_inherited));
1321         ent->attr.mtd_attr.irg = irg;
1322 }  /* set_entity_irg */
1323
1324 unsigned get_entity_vtable_number(const ir_entity *ent) {
1325         assert(is_method_entity((ir_entity *)ent));
1326         return ent->attr.mtd_attr.vtable_number;
1327 }  /* get_entity_vtable_number */
1328
1329 void set_entity_vtable_number(ir_entity *ent, unsigned vtable_number) {
1330         assert(is_method_entity(ent));
1331         ent->attr.mtd_attr.vtable_number = vtable_number;
1332 }  /* set_entity_vtable_number */
1333
1334 int
1335 (is_entity)(const void *thing) {
1336         return _is_entity(thing);
1337 }  /* is_entity */
1338
1339 int is_atomic_entity(ir_entity *ent) {
1340         ir_type *t      = get_entity_type(ent);
1341         const tp_op *op = get_type_tpop(t);
1342         return (op == type_primitive || op == type_pointer ||
1343                 op == type_enumeration || op == type_method);
1344 }  /* is_atomic_entity */
1345
1346 int is_compound_entity(ir_entity *ent) {
1347         ir_type     *t  = get_entity_type(ent);
1348         const tp_op *op = get_type_tpop(t);
1349         return (op == type_class || op == type_struct ||
1350                 op == type_array || op == type_union);
1351 }  /* is_compound_entity */
1352
1353 int is_method_entity(ir_entity *ent) {
1354         ir_type *t = get_entity_type(ent);
1355         return is_Method_type(t);
1356 }  /* is_method_entity */
1357
1358 /**
1359  * @todo not implemented!!! */
1360 int equal_entity(ir_entity *ent1, ir_entity *ent2) {
1361         (void) ent1;
1362         (void) ent2;
1363         fprintf(stderr, " calling unimplemented equal entity!!! \n");
1364         return 1;
1365 }  /* equal_entity */
1366
1367
1368 ir_visited_t (get_entity_visited)(ir_entity *ent) {
1369         return _get_entity_visited(ent);
1370 }  /* get_entity_visited */
1371
1372 void (set_entity_visited)(ir_entity *ent, ir_visited_t num) {
1373         _set_entity_visited(ent, num);
1374 }  /* set_entity_visited */
1375
1376 /* Sets visited field in ir_entity to entity_visited. */
1377 void (mark_entity_visited)(ir_entity *ent) {
1378         _mark_entity_visited(ent);
1379 }  /* mark_entity_visited */
1380
1381 int (entity_visited)(ir_entity *ent) {
1382         return _entity_visited(ent);
1383 }  /* entity_visited */
1384
1385 int (entity_not_visited)(ir_entity *ent) {
1386         return _entity_not_visited(ent);
1387 }  /* entity_not_visited */
1388
1389 /* Returns the mask of the additional entity properties. */
1390 unsigned get_entity_additional_properties(ir_entity *ent) {
1391         ir_graph *irg;
1392
1393         assert(is_method_entity(ent));
1394
1395         /* first check, if the graph has additional properties */
1396         irg = get_entity_irg(ent);
1397
1398         if (irg)
1399                 return get_irg_additional_properties(irg);
1400
1401         if (ent->attr.mtd_attr.irg_add_properties & mtp_property_inherited)
1402                 return get_method_additional_properties(get_entity_type(ent));
1403
1404         return ent->attr.mtd_attr.irg_add_properties;
1405 }  /* get_entity_additional_properties */
1406
1407 /* Sets the mask of the additional graph properties. */
1408 void set_entity_additional_properties(ir_entity *ent, unsigned property_mask)
1409 {
1410         ir_graph *irg;
1411
1412         assert(is_method_entity(ent));
1413
1414         /* first check, if the graph exists */
1415         irg = get_entity_irg(ent);
1416         if (irg)
1417                 set_irg_additional_properties(irg, property_mask);
1418         else {
1419     /* do not allow to set the mtp_property_inherited flag or
1420                 * the automatic inheritance of flags will not work */
1421                 ent->attr.mtd_attr.irg_add_properties = property_mask & ~mtp_property_inherited;
1422         }
1423 }  /* set_entity_additional_properties */
1424
1425 /* Sets one additional graph property. */
1426 void set_entity_additional_property(ir_entity *ent, mtp_additional_property flag)
1427 {
1428         ir_graph *irg;
1429
1430         assert(is_method_entity(ent));
1431
1432         /* first check, if the graph exists */
1433         irg = get_entity_irg(ent);
1434         if (irg)
1435                 set_irg_additional_property(irg, flag);
1436         else {
1437                 unsigned mask = ent->attr.mtd_attr.irg_add_properties;
1438
1439                 if (mask & mtp_property_inherited)
1440                         mask = get_method_additional_properties(get_entity_type(ent));
1441
1442                         /* do not allow to set the mtp_property_inherited flag or
1443                 * the automatic inheritance of flags will not work */
1444                 ent->attr.mtd_attr.irg_add_properties = mask | (flag & ~mtp_property_inherited);
1445         }
1446 }  /* set_entity_additional_property */
1447
1448 /* Returns the class type that this type info entity represents or NULL
1449    if ent is no type info entity. */
1450 ir_type *(get_entity_repr_class)(const ir_entity *ent) {
1451         return _get_entity_repr_class(ent);
1452 }  /* get_entity_repr_class */
1453
1454 dbg_info *(get_entity_dbg_info)(const ir_entity *ent) {
1455         return _get_entity_dbg_info(ent);
1456 }  /* get_entity_dbg_info */
1457
1458 void (set_entity_dbg_info)(ir_entity *ent, dbg_info *db) {
1459         _set_entity_dbg_info(ent, db);
1460 }  /* set_entity_dbg_info */
1461
1462 /* Initialize entity module. */
1463 void firm_init_entity(void)
1464 {
1465         symconst_symbol sym;
1466
1467         assert(firm_unknown_type && "Call init_type() before firm_init_entity()!");
1468         assert(!unknown_entity && "Call firm_init_entity() only once!");
1469
1470         unknown_entity = new_rd_entity(NULL, firm_unknown_type, new_id_from_str(UNKNOWN_ENTITY_NAME), firm_unknown_type);
1471         set_entity_visibility(unknown_entity, visibility_external_allocated);
1472         set_entity_ld_ident(unknown_entity, get_entity_ident(unknown_entity));
1473
1474         current_ir_graph      = get_const_code_irg();
1475         sym.entity_p          = unknown_entity;
1476         /* TODO: we need two unknown_entities here, one for code and one for data */
1477         unknown_entity->value = new_SymConst(mode_P_data, sym, symconst_addr_ent);
1478 }  /* firm_init_entity */