nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36 #include "driver/firm_cmdline.h"
  37
  38 /** The default calling convention. */
  39 cc_kind_t default_calling_convention = CC_CDECL;
  40
  41 static struct obstack   _type_obst;
  42 struct obstack         *type_obst                 = &_type_obst;
  43 static bool             print_implicit_array_size = false;
  44
  45 static void intern_print_type_pre(const type_t *type);
  46 static void intern_print_type_post(const type_t *type);
  47
  48 typedef struct atomic_type_properties_t atomic_type_properties_t;
  49 struct atomic_type_properties_t {
  50         unsigned   size;              /**< type size in bytes */
  51         unsigned   alignment;         /**< type alignment in bytes */
  52         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  53 };
  54
  55 /**
  56  * Returns the size of a type node.
  57  *
  58  * @param kind  the type kind
  59  */
  60 static size_t get_type_struct_size(type_kind_t kind)
  61 {
  62         static const size_t sizes[] = {
  63                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  64                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  65                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  66                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
  67                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  68                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  69                 [TYPE_ENUM]            = sizeof(enum_type_t),
  70                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  71                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  72                 [TYPE_ARRAY]           = sizeof(array_type_t),
  73                 [TYPE_BUILTIN]         = sizeof(builtin_type_t),
  74                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  75                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  76         };
  77         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  78         assert(kind <= TYPE_TYPEOF);
  79         assert(sizes[kind] != 0);
  80         return sizes[kind];
  81 }
  82
  83 type_t *allocate_type_zero(type_kind_t kind)
  84 {
  85         size_t  size = get_type_struct_size(kind);
  86         type_t *res  = obstack_alloc(type_obst, size);
  87         memset(res, 0, size);
  88         res->base.kind = kind;
  89
  90         return res;
  91 }
  92
  93 /**
  94  * Properties of atomic types.
  95  */
  96 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  97         //ATOMIC_TYPE_INVALID = 0,
  98         [ATOMIC_TYPE_VOID] = {
  99                 .size       = 0,
 100                 .alignment  = 0,
 101                 .flags      = ATOMIC_TYPE_FLAG_NONE
 102         },
 103         [ATOMIC_TYPE_WCHAR_T] = {
 104                 .size       = (unsigned)-1,
 105                 .alignment  = (unsigned)-1,
 106                 /* signed flag will be set when known */
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 108         },
 109         [ATOMIC_TYPE_CHAR] = {
 110                 .size       = 1,
 111                 .alignment  = 1,
 112                 /* signed flag will be set when known */
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_SCHAR] = {
 116                 .size       = 1,
 117                 .alignment  = 1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 119                               | ATOMIC_TYPE_FLAG_SIGNED,
 120         },
 121         [ATOMIC_TYPE_UCHAR] = {
 122                 .size       = 1,
 123                 .alignment  = 1,
 124                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 125         },
 126         [ATOMIC_TYPE_SHORT] = {
 127                 .size       = 2,
 128                 .alignment  = 2,
 129                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 130                               | ATOMIC_TYPE_FLAG_SIGNED
 131         },
 132         [ATOMIC_TYPE_USHORT] = {
 133                 .size       = 2,
 134                 .alignment  = 2,
 135                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 136         },
 137         [ATOMIC_TYPE_INT] = {
 138                 .size       = (unsigned) -1,
 139                 .alignment  = (unsigned) -1,
 140                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 141                               | ATOMIC_TYPE_FLAG_SIGNED,
 142         },
 143         [ATOMIC_TYPE_UINT] = {
 144                 .size       = (unsigned) -1,
 145                 .alignment  = (unsigned) -1,
 146                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 147         },
 148         [ATOMIC_TYPE_LONG] = {
 149                 .size       = (unsigned) -1,
 150                 .alignment  = (unsigned) -1,
 151                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 152                               | ATOMIC_TYPE_FLAG_SIGNED,
 153         },
 154         [ATOMIC_TYPE_ULONG] = {
 155                 .size       = (unsigned) -1,
 156                 .alignment  = (unsigned) -1,
 157                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 158         },
 159         [ATOMIC_TYPE_LONGLONG] = {
 160                 .size       = (unsigned) -1,
 161                 .alignment  = (unsigned) -1,
 162                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 163                               | ATOMIC_TYPE_FLAG_SIGNED,
 164         },
 165         [ATOMIC_TYPE_ULONGLONG] = {
 166                 .size       = (unsigned) -1,
 167                 .alignment  = (unsigned) -1,
 168                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 169         },
 170         [ATOMIC_TYPE_BOOL] = {
 171                 .size       = (unsigned) -1,
 172                 .alignment  = (unsigned) -1,
 173                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 174         },
 175         [ATOMIC_TYPE_FLOAT] = {
 176                 .size       = 4,
 177                 .alignment  = (unsigned) -1,
 178                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 179                               | ATOMIC_TYPE_FLAG_SIGNED,
 180         },
 181         [ATOMIC_TYPE_DOUBLE] = {
 182                 .size       = 8,
 183                 .alignment  = (unsigned) -1,
 184                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 185                               | ATOMIC_TYPE_FLAG_SIGNED,
 186         },
 187         [ATOMIC_TYPE_LONG_DOUBLE] = {
 188                 .size       = 12,
 189                 .alignment  = (unsigned) -1,
 190                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 191                               | ATOMIC_TYPE_FLAG_SIGNED,
 192         },
 193         /* complex and imaginary types are set in init_types */
 194 };
 195
 196 void init_types(void)
 197 {
 198         obstack_init(type_obst);
 199
 200         atomic_type_properties_t *props = atomic_type_properties;
 201
 202         if (char_is_signed) {
 203                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 204         }
 205
 206         unsigned int_size   = machine_size < 32 ? 2 : 4;
 207         /* long is always 32bit on windows */
 208         unsigned long_size  = c_mode & _MS ? 4 : (machine_size < 64 ? 4 : 8);
 209         unsigned llong_size = machine_size < 32 ? 4 : 8;
 210
 211         props[ATOMIC_TYPE_INT].size            = int_size;
 212         props[ATOMIC_TYPE_INT].alignment       = int_size;
 213         props[ATOMIC_TYPE_UINT].size           = int_size;
 214         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 215         props[ATOMIC_TYPE_LONG].size           = long_size;
 216         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 217         props[ATOMIC_TYPE_ULONG].size          = long_size;
 218         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 219         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 220         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 221         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 222         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 223
 224         /* TODO: backend specific, need a way to query the backend for this.
 225          * The following are good settings for x86 */
 226         if (machine_size <= 32) {
 227                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 228                 props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 229                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 230                 props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 231                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 232         } else {
 233                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 234                 props[ATOMIC_TYPE_DOUBLE].alignment      = 8;
 235                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 8;
 236                 props[ATOMIC_TYPE_LONGLONG].alignment    = 8;
 237                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 8;
 238         }
 239         if (force_long_double_size > 0) {
 240                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = force_long_double_size;
 241                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = force_long_double_size;
 242         }
 243
 244         /* TODO: make this configurable for platforms which do not use byte sized
 245          * bools. */
 246         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 247
 248         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 249 }
 250
 251 void exit_types(void)
 252 {
 253         obstack_free(type_obst, NULL);
 254 }
 255
 256 void print_type_qualifiers(type_qualifiers_t qualifiers)
 257 {
 258         if (qualifiers & TYPE_QUALIFIER_CONST) {
 259                 print_string("const ");
 260         }
 261         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 262                 print_string("volatile ");
 263         }
 264         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 265                 print_string("restrict ");
 266         }
 267 }
 268
 269 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 270 {
 271         switch(kind) {
 272         case ATOMIC_TYPE_INVALID: break;
 273         case ATOMIC_TYPE_VOID:        return "void";
 274         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 275         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 276         case ATOMIC_TYPE_CHAR:        return "char";
 277         case ATOMIC_TYPE_SCHAR:       return "signed char";
 278         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 279         case ATOMIC_TYPE_INT:         return "int";
 280         case ATOMIC_TYPE_UINT:        return "unsigned int";
 281         case ATOMIC_TYPE_SHORT:       return "short";
 282         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 283         case ATOMIC_TYPE_LONG:        return "long";
 284         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 285         case ATOMIC_TYPE_LONGLONG:    return "long long";
 286         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 287         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 288         case ATOMIC_TYPE_FLOAT:       return "float";
 289         case ATOMIC_TYPE_DOUBLE:      return "double";
 290         }
 291         return "INVALIDATOMIC";
 292 }
 293
 294 /**
 295  * Prints the name of an atomic type kinds.
 296  *
 297  * @param kind  The type kind.
 298  */
 299 static void print_atomic_kinds(atomic_type_kind_t kind)
 300 {
 301         const char *s = get_atomic_kind_name(kind);
 302         print_string(s);
 303 }
 304
 305 /**
 306  * Prints the name of an atomic type.
 307  *
 308  * @param type  The type.
 309  */
 310 static void print_atomic_type(const atomic_type_t *type)
 311 {
 312         print_type_qualifiers(type->base.qualifiers);
 313         print_atomic_kinds(type->akind);
 314 }
 315
 316 /**
 317  * Prints the name of a complex type.
 318  *
 319  * @param type  The type.
 320  */
 321 static void print_complex_type(const complex_type_t *type)
 322 {
 323         print_type_qualifiers(type->base.qualifiers);
 324         print_string("_Complex");
 325         print_atomic_kinds(type->akind);
 326 }
 327
 328 /**
 329  * Prints the name of an imaginary type.
 330  *
 331  * @param type  The type.
 332  */
 333 static void print_imaginary_type(const imaginary_type_t *type)
 334 {
 335         print_type_qualifiers(type->base.qualifiers);
 336         print_string("_Imaginary ");
 337         print_atomic_kinds(type->akind);
 338 }
 339
 340 /**
 341  * Print the first part (the prefix) of a type.
 342  *
 343  * @param type   The type to print.
 344  */
 345 static void print_function_type_pre(const function_type_t *type)
 346 {
 347         switch (type->linkage) {
 348                 case LINKAGE_INVALID:
 349                         break;
 350
 351                 case LINKAGE_C:
 352                         if (c_mode & _CXX)
 353                                 print_string("extern \"C\" ");
 354                         break;
 355
 356                 case LINKAGE_CXX:
 357                         if (!(c_mode & _CXX))
 358                                 print_string("extern \"C++\" ");
 359                         break;
 360         }
 361
 362         print_type_qualifiers(type->base.qualifiers);
 363
 364         intern_print_type_pre(type->return_type);
 365
 366         cc_kind_t cc = type->calling_convention;
 367 restart:
 368         switch (cc) {
 369         case CC_CDECL:    print_string(" __cdecl");    break;
 370         case CC_STDCALL:  print_string(" __stdcall");  break;
 371         case CC_FASTCALL: print_string(" __fastcall"); break;
 372         case CC_THISCALL: print_string(" __thiscall"); break;
 373         case CC_DEFAULT:
 374                 if (default_calling_convention != CC_CDECL) {
 375                         /* show the default calling convention if its not cdecl */
 376                         cc = default_calling_convention;
 377                         goto restart;
 378                 }
 379                 break;
 380         }
 381 }
 382
 383 /**
 384  * Print the second part (the postfix) of a type.
 385  *
 386  * @param type   The type to print.
 387  */
 388 static void print_function_type_post(const function_type_t *type,
 389                                      const scope_t *parameters)
 390 {
 391         print_string("(");
 392         bool first = true;
 393         if (parameters == NULL) {
 394                 function_parameter_t *parameter = type->parameters;
 395                 for( ; parameter != NULL; parameter = parameter->next) {
 396                         if (first) {
 397                                 first = false;
 398                         } else {
 399                                 print_string(", ");
 400                         }
 401                         print_type(parameter->type);
 402                 }
 403         } else {
 404                 entity_t *parameter = parameters->entities;
 405                 for (; parameter != NULL; parameter = parameter->base.next) {
 406                         if (parameter->kind != ENTITY_PARAMETER)
 407                                 continue;
 408
 409                         if (first) {
 410                                 first = false;
 411                         } else {
 412                                 print_string(", ");
 413                         }
 414                         const type_t *const type = parameter->declaration.type;
 415                         if (type == NULL) {
 416                                 print_string(parameter->base.symbol->string);
 417                         } else {
 418                                 print_type_ext(type, parameter->base.symbol, NULL);
 419                         }
 420                 }
 421         }
 422         if (type->variadic) {
 423                 if (first) {
 424                         first = false;
 425                 } else {
 426                         print_string(", ");
 427                 }
 428                 print_string("...");
 429         }
 430         if (first && !type->unspecified_parameters) {
 431                 print_string("void");
 432         }
 433         print_string(")");
 434
 435         intern_print_type_post(type->return_type);
 436 }
 437
 438 /**
 439  * Prints the prefix part of a pointer type.
 440  *
 441  * @param type   The pointer type.
 442  */
 443 static void print_pointer_type_pre(const pointer_type_t *type)
 444 {
 445         type_t const *const points_to = type->points_to;
 446         intern_print_type_pre(points_to);
 447         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 448                 print_string(" (");
 449         variable_t *const variable = type->base_variable;
 450         if (variable != NULL) {
 451                 print_string(" __based(");
 452                 print_string(variable->base.base.symbol->string);
 453                 print_string(") ");
 454         }
 455         print_string("*");
 456         type_qualifiers_t const qual = type->base.qualifiers;
 457         if (qual != 0)
 458                 print_string(" ");
 459         print_type_qualifiers(qual);
 460 }
 461
 462 /**
 463  * Prints the postfix part of a pointer type.
 464  *
 465  * @param type   The pointer type.
 466  */
 467 static void print_pointer_type_post(const pointer_type_t *type)
 468 {
 469         type_t const *const points_to = type->points_to;
 470         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 471                 print_string(")");
 472         intern_print_type_post(points_to);
 473 }
 474
 475 /**
 476  * Prints the prefix part of a reference type.
 477  *
 478  * @param type   The reference type.
 479  */
 480 static void print_reference_type_pre(const reference_type_t *type)
 481 {
 482         type_t const *const refers_to = type->refers_to;
 483         intern_print_type_pre(refers_to);
 484         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 485                 print_string(" (");
 486         print_string("&");
 487 }
 488
 489 /**
 490  * Prints the postfix part of a reference type.
 491  *
 492  * @param type   The reference type.
 493  */
 494 static void print_reference_type_post(const reference_type_t *type)
 495 {
 496         type_t const *const refers_to = type->refers_to;
 497         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 498                 print_string(")");
 499         intern_print_type_post(refers_to);
 500 }
 501
 502 /**
 503  * Prints the prefix part of an array type.
 504  *
 505  * @param type   The array type.
 506  */
 507 static void print_array_type_pre(const array_type_t *type)
 508 {
 509         intern_print_type_pre(type->element_type);
 510 }
 511
 512 /**
 513  * Prints the postfix part of an array type.
 514  *
 515  * @param type   The array type.
 516  */
 517 static void print_array_type_post(const array_type_t *type)
 518 {
 519         print_string("[");
 520         if (type->is_static) {
 521                 print_string("static ");
 522         }
 523         print_type_qualifiers(type->base.qualifiers);
 524         if (type->size_expression != NULL
 525                         && (print_implicit_array_size || !type->has_implicit_size)) {
 526                 print_expression(type->size_expression);
 527         }
 528         print_string("]");
 529         intern_print_type_post(type->element_type);
 530 }
 531
 532 /**
 533  * Prints the postfix part of a bitfield type.
 534  *
 535  * @param type   The array type.
 536  */
 537 static void print_bitfield_type_post(const bitfield_type_t *type)
 538 {
 539         print_string(" : ");
 540         print_expression(type->size_expression);
 541         intern_print_type_post(type->base_type);
 542 }
 543
 544 /**
 545  * Prints an enum definition.
 546  *
 547  * @param declaration  The enum's type declaration.
 548  */
 549 void print_enum_definition(const enum_t *enume)
 550 {
 551         print_string("{\n");
 552
 553         change_indent(1);
 554
 555         entity_t *entry = enume->base.next;
 556         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 557                entry = entry->base.next) {
 558
 559                 print_indent();
 560                 print_string(entry->base.symbol->string);
 561                 if (entry->enum_value.value != NULL) {
 562                         print_string(" = ");
 563
 564                         /* skip the implicit cast */
 565                         expression_t *expression = entry->enum_value.value;
 566                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 567                                 expression = expression->unary.value;
 568                         }
 569                         print_expression(expression);
 570                 }
 571                 print_string(",\n");
 572         }
 573
 574         change_indent(-1);
 575         print_indent();
 576         print_string("}");
 577 }
 578
 579 /**
 580  * Prints an enum type.
 581  *
 582  * @param type  The enum type.
 583  */
 584 static void print_type_enum(const enum_type_t *type)
 585 {
 586         print_type_qualifiers(type->base.qualifiers);
 587         print_string("enum ");
 588
 589         enum_t   *enume  = type->enume;
 590         symbol_t *symbol = enume->base.symbol;
 591         if (symbol != NULL) {
 592                 print_string(symbol->string);
 593         } else {
 594                 print_enum_definition(enume);
 595         }
 596 }
 597
 598 /**
 599  * Print the compound part of a compound type.
 600  */
 601 void print_compound_definition(const compound_t *compound)
 602 {
 603         print_string("{\n");
 604         change_indent(1);
 605
 606         entity_t *entity = compound->members.entities;
 607         for( ; entity != NULL; entity = entity->base.next) {
 608                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 609                         continue;
 610
 611                 print_indent();
 612                 print_entity(entity);
 613                 print_string("\n");
 614         }
 615
 616         change_indent(-1);
 617         print_indent();
 618         print_string("}");
 619         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 620                 print_string("__attribute__((__transparent_union__))");
 621         }
 622 }
 623
 624 /**
 625  * Prints a compound type.
 626  *
 627  * @param type  The compound type.
 628  */
 629 static void print_compound_type(const compound_type_t *type)
 630 {
 631         print_type_qualifiers(type->base.qualifiers);
 632
 633         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 634                 print_string("struct ");
 635         } else {
 636                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 637                 print_string("union ");
 638         }
 639
 640         compound_t *compound = type->compound;
 641         symbol_t   *symbol   = compound->base.symbol;
 642         if (symbol != NULL) {
 643                 print_string(symbol->string);
 644         } else {
 645                 print_compound_definition(compound);
 646         }
 647 }
 648
 649 /**
 650  * Prints the prefix part of a typedef type.
 651  *
 652  * @param type   The typedef type.
 653  */
 654 static void print_typedef_type_pre(const typedef_type_t *const type)
 655 {
 656         print_type_qualifiers(type->base.qualifiers);
 657         print_string(type->typedefe->base.symbol->string);
 658 }
 659
 660 /**
 661  * Prints the prefix part of a typeof type.
 662  *
 663  * @param type   The typeof type.
 664  */
 665 static void print_typeof_type_pre(const typeof_type_t *const type)
 666 {
 667         print_string("typeof(");
 668         if (type->expression != NULL) {
 669                 print_expression(type->expression);
 670         } else {
 671                 print_type(type->typeof_type);
 672         }
 673         print_string(")");
 674 }
 675
 676 /**
 677  * Prints the prefix part of a type.
 678  *
 679  * @param type   The type.
 680  */
 681 static void intern_print_type_pre(const type_t *const type)
 682 {
 683         switch(type->kind) {
 684         case TYPE_ERROR:
 685                 print_string("<error>");
 686                 return;
 687         case TYPE_INVALID:
 688                 print_string("<invalid>");
 689                 return;
 690         case TYPE_ENUM:
 691                 print_type_enum(&type->enumt);
 692                 return;
 693         case TYPE_ATOMIC:
 694                 print_atomic_type(&type->atomic);
 695                 return;
 696         case TYPE_COMPLEX:
 697                 print_complex_type(&type->complex);
 698                 return;
 699         case TYPE_IMAGINARY:
 700                 print_imaginary_type(&type->imaginary);
 701                 return;
 702         case TYPE_COMPOUND_STRUCT:
 703         case TYPE_COMPOUND_UNION:
 704                 print_compound_type(&type->compound);
 705                 return;
 706         case TYPE_BUILTIN:
 707                 print_string(type->builtin.symbol->string);
 708                 return;
 709         case TYPE_FUNCTION:
 710                 print_function_type_pre(&type->function);
 711                 return;
 712         case TYPE_POINTER:
 713                 print_pointer_type_pre(&type->pointer);
 714                 return;
 715         case TYPE_REFERENCE:
 716                 print_reference_type_pre(&type->reference);
 717                 return;
 718         case TYPE_BITFIELD:
 719                 intern_print_type_pre(type->bitfield.base_type);
 720                 return;
 721         case TYPE_ARRAY:
 722                 print_array_type_pre(&type->array);
 723                 return;
 724         case TYPE_TYPEDEF:
 725                 print_typedef_type_pre(&type->typedeft);
 726                 return;
 727         case TYPE_TYPEOF:
 728                 print_typeof_type_pre(&type->typeoft);
 729                 return;
 730         }
 731         print_string("unknown");
 732 }
 733
 734 /**
 735  * Prints the postfix part of a type.
 736  *
 737  * @param type   The type.
 738  */
 739 static void intern_print_type_post(const type_t *const type)
 740 {
 741         switch(type->kind) {
 742         case TYPE_FUNCTION:
 743                 print_function_type_post(&type->function, NULL);
 744                 return;
 745         case TYPE_POINTER:
 746                 print_pointer_type_post(&type->pointer);
 747                 return;
 748         case TYPE_REFERENCE:
 749                 print_reference_type_post(&type->reference);
 750                 return;
 751         case TYPE_ARRAY:
 752                 print_array_type_post(&type->array);
 753                 return;
 754         case TYPE_BITFIELD:
 755                 print_bitfield_type_post(&type->bitfield);
 756                 return;
 757         case TYPE_ERROR:
 758         case TYPE_INVALID:
 759         case TYPE_ATOMIC:
 760         case TYPE_COMPLEX:
 761         case TYPE_IMAGINARY:
 762         case TYPE_ENUM:
 763         case TYPE_COMPOUND_STRUCT:
 764         case TYPE_COMPOUND_UNION:
 765         case TYPE_BUILTIN:
 766         case TYPE_TYPEOF:
 767         case TYPE_TYPEDEF:
 768                 break;
 769         }
 770 }
 771
 772 /**
 773  * Prints a type.
 774  *
 775  * @param type   The type.
 776  */
 777 void print_type(const type_t *const type)
 778 {
 779         print_type_ext(type, NULL, NULL);
 780 }
 781
 782 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 783                     const scope_t *parameters)
 784 {
 785         intern_print_type_pre(type);
 786         if (symbol != NULL) {
 787                 print_string(" ");
 788                 print_string(symbol->string);
 789         }
 790         if (type->kind == TYPE_FUNCTION) {
 791                 print_function_type_post(&type->function, parameters);
 792         } else {
 793                 intern_print_type_post(type);
 794         }
 795 }
 796
 797 /**
 798  * Duplicates a type.
 799  *
 800  * @param type  The type to copy.
 801  * @return A copy of the type.
 802  *
 803  * @note This does not produce a deep copy!
 804  */
 805 type_t *duplicate_type(const type_t *type)
 806 {
 807         size_t size = get_type_struct_size(type->kind);
 808
 809         type_t *copy = obstack_alloc(type_obst, size);
 810         memcpy(copy, type, size);
 811         copy->base.firm_type = NULL;
 812
 813         return copy;
 814 }
 815
 816 /**
 817  * Returns the unqualified type of a given type.
 818  *
 819  * @param type  The type.
 820  * @returns The unqualified type.
 821  */
 822 type_t *get_unqualified_type(type_t *type)
 823 {
 824         assert(!is_typeref(type));
 825
 826         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 827                 return type;
 828
 829         type_t *unqualified_type          = duplicate_type(type);
 830         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 831
 832         return identify_new_type(unqualified_type);
 833 }
 834
 835 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 836 {
 837         type_t *type = skip_typeref(orig_type);
 838
 839         type_t *copy;
 840         if (is_type_array(type)) {
 841                 /* For array types the element type has to be adjusted */
 842                 type_t *element_type      = type->array.element_type;
 843                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 844
 845                 if (qual_element_type == element_type)
 846                         return orig_type;
 847
 848                 copy                     = duplicate_type(type);
 849                 copy->array.element_type = qual_element_type;
 850         } else if (is_type_valid(type)) {
 851                 if ((type->base.qualifiers & qual) == qual)
 852                         return orig_type;
 853
 854                 copy                   = duplicate_type(type);
 855                 copy->base.qualifiers |= qual;
 856         } else {
 857                 return type;
 858         }
 859
 860         return identify_new_type(copy);
 861 }
 862
 863 /**
 864  * Check if a type is valid.
 865  *
 866  * @param type  The type to check.
 867  * @return true if type represents a valid type.
 868  */
 869 bool type_valid(const type_t *type)
 870 {
 871         return type->kind != TYPE_INVALID;
 872 }
 873
 874 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 875                                   atomic_type_flag_t flag)
 876 {
 877         assert(kind <= ATOMIC_TYPE_LAST);
 878         return (atomic_type_properties[kind].flags & flag) != 0;
 879 }
 880
 881 /**
 882  * Returns true if the given type is an integer type.
 883  *
 884  * @param type  The type to check.
 885  * @return True if type is an integer type.
 886  */
 887 bool is_type_integer(const type_t *type)
 888 {
 889         assert(!is_typeref(type));
 890
 891         if (type->kind == TYPE_ENUM)
 892                 return true;
 893         if (type->kind == TYPE_BITFIELD)
 894                 return true;
 895
 896         if (type->kind != TYPE_ATOMIC)
 897                 return false;
 898
 899         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 900 }
 901
 902 /**
 903  * Returns true if the given type is an enum type.
 904  *
 905  * @param type  The type to check.
 906  * @return True if type is an enum type.
 907  */
 908 bool is_type_enum(const type_t *type)
 909 {
 910         assert(!is_typeref(type));
 911         return type->kind == TYPE_ENUM;
 912 }
 913
 914 /**
 915  * Returns true if the given type is an floating point type.
 916  *
 917  * @param type  The type to check.
 918  * @return True if type is a floating point type.
 919  */
 920 bool is_type_float(const type_t *type)
 921 {
 922         assert(!is_typeref(type));
 923
 924         if (type->kind != TYPE_ATOMIC)
 925                 return false;
 926
 927         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 928 }
 929
 930 /**
 931  * Returns true if the given type is an complex type.
 932  *
 933  * @param type  The type to check.
 934  * @return True if type is a complex type.
 935  */
 936 bool is_type_complex(const type_t *type)
 937 {
 938         assert(!is_typeref(type));
 939
 940         if (type->kind != TYPE_ATOMIC)
 941                 return false;
 942
 943         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 944 }
 945
 946 /**
 947  * Returns true if the given type is a signed type.
 948  *
 949  * @param type  The type to check.
 950  * @return True if type is a signed type.
 951  */
 952 bool is_type_signed(const type_t *type)
 953 {
 954         assert(!is_typeref(type));
 955
 956         /* enum types are int for now */
 957         if (type->kind == TYPE_ENUM)
 958                 return true;
 959         if (type->kind == TYPE_BITFIELD)
 960                 return is_type_signed(type->bitfield.base_type);
 961
 962         if (type->kind != TYPE_ATOMIC)
 963                 return false;
 964
 965         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 966 }
 967
 968 /**
 969  * Returns true if the given type represents an arithmetic type.
 970  *
 971  * @param type  The type to check.
 972  * @return True if type represents an arithmetic type.
 973  */
 974 bool is_type_arithmetic(const type_t *type)
 975 {
 976         assert(!is_typeref(type));
 977
 978         switch(type->kind) {
 979         case TYPE_BITFIELD:
 980         case TYPE_ENUM:
 981                 return true;
 982         case TYPE_ATOMIC:
 983                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 984         case TYPE_COMPLEX:
 985                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 986         case TYPE_IMAGINARY:
 987                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 988         default:
 989                 return false;
 990         }
 991 }
 992
 993 /**
 994  * Returns true if the given type is an integer or float type.
 995  *
 996  * @param type  The type to check.
 997  * @return True if type is an integer or float type.
 998  */
 999 bool is_type_real(const type_t *type)
1000 {
1001         /* 6.2.5 (17) */
1002         return is_type_integer(type) || is_type_float(type);
1003 }
1004
1005 /**
1006  * Returns true if the given type represents a scalar type.
1007  *
1008  * @param type  The type to check.
1009  * @return True if type represents a scalar type.
1010  */
1011 bool is_type_scalar(const type_t *type)
1012 {
1013         assert(!is_typeref(type));
1014
1015         switch (type->kind) {
1016         case TYPE_POINTER: return true;
1017         case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1018         default:           break;
1019         }
1020
1021         return is_type_arithmetic(type);
1022 }
1023
1024 /**
1025  * Check if a given type is incomplete.
1026  *
1027  * @param type  The type to check.
1028  * @return True if the given type is incomplete (ie. just forward).
1029  */
1030 bool is_type_incomplete(const type_t *type)
1031 {
1032         assert(!is_typeref(type));
1033
1034         switch(type->kind) {
1035         case TYPE_COMPOUND_STRUCT:
1036         case TYPE_COMPOUND_UNION: {
1037                 const compound_type_t *compound_type = &type->compound;
1038                 return !compound_type->compound->complete;
1039         }
1040         case TYPE_ENUM:
1041                 return false;
1042
1043         case TYPE_ARRAY:
1044                 return type->array.size_expression == NULL
1045                         && !type->array.size_constant;
1046
1047         case TYPE_ATOMIC:
1048                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1049
1050         case TYPE_COMPLEX:
1051                 return type->complex.akind == ATOMIC_TYPE_VOID;
1052
1053         case TYPE_IMAGINARY:
1054                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1055
1056         case TYPE_BITFIELD:
1057         case TYPE_FUNCTION:
1058         case TYPE_POINTER:
1059         case TYPE_REFERENCE:
1060         case TYPE_BUILTIN:
1061         case TYPE_ERROR:
1062                 return false;
1063
1064         case TYPE_TYPEDEF:
1065         case TYPE_TYPEOF:
1066                 panic("is_type_incomplete called without typerefs skipped");
1067         case TYPE_INVALID:
1068                 break;
1069         }
1070
1071         panic("invalid type found");
1072 }
1073
1074 bool is_type_object(const type_t *type)
1075 {
1076         return !is_type_function(type) && !is_type_incomplete(type);
1077 }
1078
1079 bool is_builtin_va_list(type_t *type)
1080 {
1081         type_t *tp = skip_typeref(type);
1082
1083         return tp->kind == type_valist->kind &&
1084                tp->builtin.symbol == type_valist->builtin.symbol;
1085 }
1086
1087 /**
1088  * Check if two function types are compatible.
1089  */
1090 static bool function_types_compatible(const function_type_t *func1,
1091                                       const function_type_t *func2)
1092 {
1093         const type_t* const ret1 = skip_typeref(func1->return_type);
1094         const type_t* const ret2 = skip_typeref(func2->return_type);
1095         if (!types_compatible(ret1, ret2))
1096                 return false;
1097
1098         if (func1->linkage != func2->linkage)
1099                 return false;
1100
1101         cc_kind_t cc1 = func1->calling_convention;
1102         if (cc1 == CC_DEFAULT)
1103                 cc1 = default_calling_convention;
1104         cc_kind_t cc2 = func2->calling_convention;
1105         if (cc2 == CC_DEFAULT)
1106                 cc2 = default_calling_convention;
1107
1108         if (cc1 != cc2)
1109                 return false;
1110
1111         if (func1->variadic != func2->variadic)
1112                 return false;
1113
1114         /* can parameters be compared? */
1115         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1116                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1117                 return true;
1118
1119         /* TODO: handling of unspecified parameters not correct yet */
1120
1121         /* all argument types must be compatible */
1122         function_parameter_t *parameter1 = func1->parameters;
1123         function_parameter_t *parameter2 = func2->parameters;
1124         for ( ; parameter1 != NULL && parameter2 != NULL;
1125                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1126                 type_t *parameter1_type = skip_typeref(parameter1->type);
1127                 type_t *parameter2_type = skip_typeref(parameter2->type);
1128
1129                 parameter1_type = get_unqualified_type(parameter1_type);
1130                 parameter2_type = get_unqualified_type(parameter2_type);
1131
1132                 if (!types_compatible(parameter1_type, parameter2_type))
1133                         return false;
1134         }
1135         /* same number of arguments? */
1136         if (parameter1 != NULL || parameter2 != NULL)
1137                 return false;
1138
1139         return true;
1140 }
1141
1142 /**
1143  * Check if two array types are compatible.
1144  */
1145 static bool array_types_compatible(const array_type_t *array1,
1146                                    const array_type_t *array2)
1147 {
1148         type_t *element_type1 = skip_typeref(array1->element_type);
1149         type_t *element_type2 = skip_typeref(array2->element_type);
1150         if (!types_compatible(element_type1, element_type2))
1151                 return false;
1152
1153         if (!array1->size_constant || !array2->size_constant)
1154                 return true;
1155
1156         return array1->size == array2->size;
1157 }
1158
1159 /**
1160  * Check if two types are compatible.
1161  */
1162 bool types_compatible(const type_t *type1, const type_t *type2)
1163 {
1164         assert(!is_typeref(type1));
1165         assert(!is_typeref(type2));
1166
1167         /* shortcut: the same type is always compatible */
1168         if (type1 == type2)
1169                 return true;
1170
1171         if (!is_type_valid(type1) || !is_type_valid(type2))
1172                 return true;
1173
1174         if (type1->base.qualifiers != type2->base.qualifiers)
1175                 return false;
1176         if (type1->kind != type2->kind)
1177                 return false;
1178
1179         switch (type1->kind) {
1180         case TYPE_FUNCTION:
1181                 return function_types_compatible(&type1->function, &type2->function);
1182         case TYPE_ATOMIC:
1183                 return type1->atomic.akind == type2->atomic.akind;
1184         case TYPE_COMPLEX:
1185                 return type1->complex.akind == type2->complex.akind;
1186         case TYPE_IMAGINARY:
1187                 return type1->imaginary.akind == type2->imaginary.akind;
1188         case TYPE_ARRAY:
1189                 return array_types_compatible(&type1->array, &type2->array);
1190
1191         case TYPE_POINTER: {
1192                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1193                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1194                 return types_compatible(to1, to2);
1195         }
1196
1197         case TYPE_REFERENCE: {
1198                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1199                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1200                 return types_compatible(to1, to2);
1201         }
1202
1203         case TYPE_COMPOUND_STRUCT:
1204         case TYPE_COMPOUND_UNION: {
1205
1206
1207                 break;
1208         }
1209         case TYPE_ENUM:
1210         case TYPE_BUILTIN:
1211                 /* TODO: not implemented */
1212                 break;
1213
1214         case TYPE_BITFIELD:
1215                 /* not sure if this makes sense or is even needed, implement it if you
1216                  * really need it! */
1217                 panic("type compatibility check for bitfield type");
1218
1219         case TYPE_ERROR:
1220                 /* Hmm, the error type should be compatible to all other types */
1221                 return true;
1222         case TYPE_INVALID:
1223                 panic("invalid type found in compatible types");
1224         case TYPE_TYPEDEF:
1225         case TYPE_TYPEOF:
1226                 panic("typerefs not skipped in compatible types?!?");
1227         }
1228
1229         /* TODO: incomplete */
1230         return false;
1231 }
1232
1233 /**
1234  * Skip all typerefs and return the underlying type.
1235  */
1236 type_t *skip_typeref(type_t *type)
1237 {
1238         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1239
1240         while (true) {
1241                 switch (type->kind) {
1242                 case TYPE_ERROR:
1243                         return type;
1244                 case TYPE_TYPEDEF: {
1245                         qualifiers |= type->base.qualifiers;
1246
1247                         const typedef_type_t *typedef_type = &type->typedeft;
1248                         if (typedef_type->resolved_type != NULL) {
1249                                 type = typedef_type->resolved_type;
1250                                 break;
1251                         }
1252                         type = typedef_type->typedefe->type;
1253                         continue;
1254                 }
1255                 case TYPE_TYPEOF:
1256                         qualifiers |= type->base.qualifiers;
1257                         type        = type->typeoft.typeof_type;
1258                         continue;
1259                 default:
1260                         break;
1261                 }
1262                 break;
1263         }
1264
1265         if (qualifiers != TYPE_QUALIFIER_NONE) {
1266                 type_t *const copy = duplicate_type(type);
1267
1268                 /* for const with typedefed array type the element type has to be
1269                  * adjusted */
1270                 if (is_type_array(copy)) {
1271                         type_t *element_type           = copy->array.element_type;
1272                         element_type                   = duplicate_type(element_type);
1273                         element_type->base.qualifiers |= qualifiers;
1274                         copy->array.element_type       = element_type;
1275                 } else {
1276                         copy->base.qualifiers |= qualifiers;
1277                 }
1278
1279                 type = identify_new_type(copy);
1280         }
1281
1282         return type;
1283 }
1284
1285 unsigned get_type_size(type_t *type)
1286 {
1287         switch (type->kind) {
1288         case TYPE_INVALID:
1289                 break;
1290         case TYPE_ERROR:
1291                 return 0;
1292         case TYPE_ATOMIC:
1293                 return get_atomic_type_size(type->atomic.akind);
1294         case TYPE_COMPLEX:
1295                 return get_atomic_type_size(type->complex.akind) * 2;
1296         case TYPE_IMAGINARY:
1297                 return get_atomic_type_size(type->imaginary.akind);
1298         case TYPE_COMPOUND_UNION:
1299                 layout_union_type(&type->compound);
1300                 return type->compound.compound->size;
1301         case TYPE_COMPOUND_STRUCT:
1302                 layout_struct_type(&type->compound);
1303                 return type->compound.compound->size;
1304         case TYPE_ENUM:
1305                 return get_atomic_type_size(type->enumt.akind);
1306         case TYPE_FUNCTION:
1307                 return 0; /* non-const (but "address-const") */
1308         case TYPE_REFERENCE:
1309         case TYPE_POINTER:
1310                 /* TODO: make configurable by backend */
1311                 return 4;
1312         case TYPE_ARRAY: {
1313                 /* TODO: correct if element_type is aligned? */
1314                 il_size_t element_size = get_type_size(type->array.element_type);
1315                 return type->array.size * element_size;
1316         }
1317         case TYPE_BITFIELD:
1318                 return 0;
1319         case TYPE_BUILTIN:
1320                 return get_type_size(type->builtin.real_type);
1321         case TYPE_TYPEDEF:
1322                 return get_type_size(type->typedeft.typedefe->type);
1323         case TYPE_TYPEOF:
1324                 if (type->typeoft.typeof_type) {
1325                         return get_type_size(type->typeoft.typeof_type);
1326                 } else {
1327                         return get_type_size(type->typeoft.expression->base.type);
1328                 }
1329         }
1330         panic("invalid type in get_type_size");
1331 }
1332
1333 unsigned get_type_alignment(type_t *type)
1334 {
1335         switch (type->kind) {
1336         case TYPE_INVALID:
1337                 break;
1338         case TYPE_ERROR:
1339                 return 0;
1340         case TYPE_ATOMIC:
1341                 return get_atomic_type_alignment(type->atomic.akind);
1342         case TYPE_COMPLEX:
1343                 return get_atomic_type_alignment(type->complex.akind);
1344         case TYPE_IMAGINARY:
1345                 return get_atomic_type_alignment(type->imaginary.akind);
1346         case TYPE_COMPOUND_UNION:
1347                 layout_union_type(&type->compound);
1348                 return type->compound.compound->alignment;
1349         case TYPE_COMPOUND_STRUCT:
1350                 layout_struct_type(&type->compound);
1351                 return type->compound.compound->alignment;
1352         case TYPE_ENUM:
1353                 return get_atomic_type_alignment(type->enumt.akind);
1354         case TYPE_FUNCTION:
1355                 /* what is correct here? */
1356                 return 4;
1357         case TYPE_REFERENCE:
1358         case TYPE_POINTER:
1359                 /* TODO: make configurable by backend */
1360                 return 4;
1361         case TYPE_ARRAY:
1362                 return get_type_alignment(type->array.element_type);
1363         case TYPE_BITFIELD:
1364                 return 0;
1365         case TYPE_BUILTIN:
1366                 return get_type_alignment(type->builtin.real_type);
1367         case TYPE_TYPEDEF: {
1368                 il_alignment_t alignment
1369                         = get_type_alignment(type->typedeft.typedefe->type);
1370                 if (type->typedeft.typedefe->alignment > alignment)
1371                         alignment = type->typedeft.typedefe->alignment;
1372
1373                 return alignment;
1374         }
1375         case TYPE_TYPEOF:
1376                 if (type->typeoft.typeof_type) {
1377                         return get_type_alignment(type->typeoft.typeof_type);
1378                 } else {
1379                         return get_type_alignment(type->typeoft.expression->base.type);
1380                 }
1381         }
1382         panic("invalid type in get_type_alignment");
1383 }
1384
1385 decl_modifiers_t get_type_modifiers(const type_t *type)
1386 {
1387         switch(type->kind) {
1388         case TYPE_INVALID:
1389         case TYPE_ERROR:
1390                 break;
1391         case TYPE_COMPOUND_STRUCT:
1392         case TYPE_COMPOUND_UNION:
1393                 return type->compound.compound->modifiers;
1394         case TYPE_FUNCTION:
1395                 return type->function.modifiers;
1396         case TYPE_ENUM:
1397         case TYPE_ATOMIC:
1398         case TYPE_COMPLEX:
1399         case TYPE_IMAGINARY:
1400         case TYPE_REFERENCE:
1401         case TYPE_POINTER:
1402         case TYPE_BITFIELD:
1403         case TYPE_ARRAY:
1404                 return 0;
1405         case TYPE_BUILTIN:
1406                 return get_type_modifiers(type->builtin.real_type);
1407         case TYPE_TYPEDEF: {
1408                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1409                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1410                 return modifiers;
1411         }
1412         case TYPE_TYPEOF:
1413                 if (type->typeoft.typeof_type) {
1414                         return get_type_modifiers(type->typeoft.typeof_type);
1415                 } else {
1416                         return get_type_modifiers(type->typeoft.expression->base.type);
1417                 }
1418         }
1419         panic("invalid type found in get_type_modifiers");
1420 }
1421
1422 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1423 {
1424         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1425
1426         while (true) {
1427                 switch (type->base.kind) {
1428                 case TYPE_ERROR:
1429                         return TYPE_QUALIFIER_NONE;
1430                 case TYPE_TYPEDEF:
1431                         qualifiers |= type->base.qualifiers;
1432                         const typedef_type_t *typedef_type = &type->typedeft;
1433                         if (typedef_type->resolved_type != NULL)
1434                                 type = typedef_type->resolved_type;
1435                         else
1436                                 type = typedef_type->typedefe->type;
1437                         continue;
1438                 case TYPE_TYPEOF:
1439                         type = type->typeoft.typeof_type;
1440                         continue;
1441                 case TYPE_ARRAY:
1442                         if (skip_array_type) {
1443                                 type = type->array.element_type;
1444                                 continue;
1445                         }
1446                         break;
1447                 default:
1448                         break;
1449                 }
1450                 break;
1451         }
1452         return type->base.qualifiers | qualifiers;
1453 }
1454
1455 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1456 {
1457         assert(kind <= ATOMIC_TYPE_LAST);
1458         return atomic_type_properties[kind].size;
1459 }
1460
1461 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1462 {
1463         assert(kind <= ATOMIC_TYPE_LAST);
1464         return atomic_type_properties[kind].alignment;
1465 }
1466
1467 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1468 {
1469         assert(kind <= ATOMIC_TYPE_LAST);
1470         return atomic_type_properties[kind].flags;
1471 }
1472
1473 atomic_type_kind_t get_intptr_kind(void)
1474 {
1475         if (machine_size <= 32)
1476                 return ATOMIC_TYPE_INT;
1477         else if (machine_size <= 64)
1478                 return ATOMIC_TYPE_LONG;
1479         else
1480                 return ATOMIC_TYPE_LONGLONG;
1481 }
1482
1483 atomic_type_kind_t get_uintptr_kind(void)
1484 {
1485         if (machine_size <= 32)
1486                 return ATOMIC_TYPE_UINT;
1487         else if (machine_size <= 64)
1488                 return ATOMIC_TYPE_ULONG;
1489         else
1490                 return ATOMIC_TYPE_ULONGLONG;
1491 }
1492
1493 /**
1494  * Find the atomic type kind representing a given size (signed).
1495  */
1496 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1497 {
1498         static atomic_type_kind_t kinds[32];
1499
1500         assert(size < 32);
1501         atomic_type_kind_t kind = kinds[size];
1502         if (kind == ATOMIC_TYPE_INVALID) {
1503                 static const atomic_type_kind_t possible_kinds[] = {
1504                         ATOMIC_TYPE_SCHAR,
1505                         ATOMIC_TYPE_SHORT,
1506                         ATOMIC_TYPE_INT,
1507                         ATOMIC_TYPE_LONG,
1508                         ATOMIC_TYPE_LONGLONG
1509                 };
1510                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1511                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1512                                 kind = possible_kinds[i];
1513                                 break;
1514                         }
1515                 }
1516                 kinds[size] = kind;
1517         }
1518         return kind;
1519 }
1520
1521 /**
1522  * Find the atomic type kind representing a given size (signed).
1523  */
1524 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1525 {
1526         static atomic_type_kind_t kinds[32];
1527
1528         assert(size < 32);
1529         atomic_type_kind_t kind = kinds[size];
1530         if (kind == ATOMIC_TYPE_INVALID) {
1531                 static const atomic_type_kind_t possible_kinds[] = {
1532                         ATOMIC_TYPE_UCHAR,
1533                         ATOMIC_TYPE_USHORT,
1534                         ATOMIC_TYPE_UINT,
1535                         ATOMIC_TYPE_ULONG,
1536                         ATOMIC_TYPE_ULONGLONG
1537                 };
1538                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1539                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1540                                 kind = possible_kinds[i];
1541                                 break;
1542                         }
1543                 }
1544                 kinds[size] = kind;
1545         }
1546         return kind;
1547 }
1548
1549 /**
1550  * Hash the given type and return the "singleton" version
1551  * of it.
1552  */
1553 type_t *identify_new_type(type_t *type)
1554 {
1555         type_t *result = typehash_insert(type);
1556         if (result != type) {
1557                 obstack_free(type_obst, type);
1558         }
1559         return result;
1560 }
1561
1562 /**
1563  * Creates a new atomic type.
1564  *
1565  * @param akind       The kind of the atomic type.
1566  * @param qualifiers  Type qualifiers for the new type.
1567  */
1568 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1569 {
1570         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1571         memset(type, 0, sizeof(atomic_type_t));
1572
1573         type->kind            = TYPE_ATOMIC;
1574         type->base.qualifiers = qualifiers;
1575         type->atomic.akind    = akind;
1576
1577         return identify_new_type(type);
1578 }
1579
1580 /**
1581  * Creates a new complex type.
1582  *
1583  * @param akind       The kind of the atomic type.
1584  * @param qualifiers  Type qualifiers for the new type.
1585  */
1586 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1587 {
1588         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1589         memset(type, 0, sizeof(complex_type_t));
1590
1591         type->kind            = TYPE_COMPLEX;
1592         type->base.qualifiers = qualifiers;
1593         type->complex.akind   = akind;
1594
1595         return identify_new_type(type);
1596 }
1597
1598 /**
1599  * Creates a new imaginary type.
1600  *
1601  * @param akind       The kind of the atomic type.
1602  * @param qualifiers  Type qualifiers for the new type.
1603  */
1604 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1605 {
1606         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1607         memset(type, 0, sizeof(imaginary_type_t));
1608
1609         type->kind            = TYPE_IMAGINARY;
1610         type->base.qualifiers = qualifiers;
1611         type->imaginary.akind = akind;
1612
1613         return identify_new_type(type);
1614 }
1615
1616 /**
1617  * Creates a new pointer type.
1618  *
1619  * @param points_to   The points-to type for the new type.
1620  * @param qualifiers  Type qualifiers for the new type.
1621  */
1622 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1623 {
1624         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1625         memset(type, 0, sizeof(pointer_type_t));
1626
1627         type->kind                  = TYPE_POINTER;
1628         type->base.qualifiers       = qualifiers;
1629         type->pointer.points_to     = points_to;
1630         type->pointer.base_variable = NULL;
1631
1632         return identify_new_type(type);
1633 }
1634
1635 /**
1636  * Creates a new reference type.
1637  *
1638  * @param refers_to   The referred-to type for the new type.
1639  */
1640 type_t *make_reference_type(type_t *refers_to)
1641 {
1642         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1643         memset(type, 0, sizeof(reference_type_t));
1644
1645         type->kind                = TYPE_REFERENCE;
1646         type->base.qualifiers     = 0;
1647         type->reference.refers_to = refers_to;
1648
1649         return identify_new_type(type);
1650 }
1651
1652 /**
1653  * Creates a new based pointer type.
1654  *
1655  * @param points_to   The points-to type for the new type.
1656  * @param qualifiers  Type qualifiers for the new type.
1657  * @param variable    The based variable
1658  */
1659 type_t *make_based_pointer_type(type_t *points_to,
1660                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1661 {
1662         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1663         memset(type, 0, sizeof(pointer_type_t));
1664
1665         type->kind                  = TYPE_POINTER;
1666         type->base.qualifiers       = qualifiers;
1667         type->pointer.points_to     = points_to;
1668         type->pointer.base_variable = variable;
1669
1670         return identify_new_type(type);
1671 }
1672
1673
1674 type_t *make_array_type(type_t *element_type, size_t size,
1675                         type_qualifiers_t qualifiers)
1676 {
1677         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1678         memset(type, 0, sizeof(array_type_t));
1679
1680         type->kind                = TYPE_ARRAY;
1681         type->base.qualifiers     = qualifiers;
1682         type->array.element_type  = element_type;
1683         type->array.size          = size;
1684         type->array.size_constant = true;
1685
1686         return identify_new_type(type);
1687 }
1688
1689 static entity_t *pack_bitfield_members_big_endian(il_size_t *struct_offset,
1690                 il_alignment_t *struct_alignment, bool packed, entity_t *first)
1691 {
1692         type_t        *current_base_type = NULL;
1693         il_size_t      offset            = *struct_offset;
1694         il_alignment_t alignment         = *struct_alignment;
1695         size_t         bit_offset        = 0;
1696
1697         if (packed)
1698                 panic("packed bitfields on big-endian arch not supported yet");
1699
1700         entity_t *member;
1701         for (member = first; member != NULL; member = member->base.next) {
1702                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1703                         continue;
1704
1705                 type_t *type = member->declaration.type;
1706                 if (type->kind != TYPE_BITFIELD)
1707                         break;
1708
1709                 size_t  bit_size  = type->bitfield.bit_size;
1710                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1711
1712                 /* see if we need to start a new "bucket" */
1713                 if (base_type != current_base_type || bit_size > bit_offset) {
1714                         if (current_base_type != NULL)
1715                                 offset += get_type_size(current_base_type);
1716
1717                         current_base_type = base_type;
1718                         il_alignment_t base_alignment = get_type_alignment(base_type);
1719                         il_alignment_t alignment_mask = base_alignment-1;
1720                         if (base_alignment > alignment)
1721                                 alignment = base_alignment;
1722                         offset     = (offset + base_alignment-1) & ~alignment_mask;
1723                         bit_offset = get_type_size(base_type) * BITS_PER_BYTE;
1724                         assert(bit_offset >= bit_size);
1725                 }
1726
1727                 bit_offset -= bit_size;
1728                 member->compound_member.offset     = offset;
1729                 member->compound_member.bit_offset = bit_offset;
1730         }
1731
1732         if (current_base_type != NULL)
1733                 offset += get_type_size(current_base_type);
1734
1735         *struct_offset    = offset;
1736         *struct_alignment = alignment;
1737         return member;
1738 }
1739
1740 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1741                                        il_alignment_t *struct_alignment,
1742                                                                            bool packed, entity_t *first)
1743 {
1744         il_size_t      offset     = *struct_offset;
1745         il_alignment_t alignment  = *struct_alignment;
1746         size_t         bit_offset = 0;
1747
1748         entity_t *member;
1749         for (member = first; member != NULL; member = member->base.next) {
1750                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1751                         continue;
1752
1753                 type_t *type = member->declaration.type;
1754                 if (type->kind != TYPE_BITFIELD)
1755                         break;
1756
1757                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1758                 il_alignment_t base_alignment = get_type_alignment(base_type);
1759                 il_alignment_t alignment_mask = base_alignment-1;
1760                 if (base_alignment > alignment)
1761                         alignment = base_alignment;
1762
1763                 size_t bit_size = type->bitfield.bit_size;
1764                 if (!packed) {
1765                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1766                         offset     &= ~alignment_mask;
1767                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1768
1769                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1770                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1771                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1772                                 bit_offset = 0;
1773                         }
1774                 }
1775
1776                 member->compound_member.offset     = offset;
1777                 member->compound_member.bit_offset = bit_offset;
1778
1779                 bit_offset += bit_size;
1780                 offset     += bit_offset / BITS_PER_BYTE;
1781                 bit_offset %= BITS_PER_BYTE;
1782         }
1783
1784         if (bit_offset > 0)
1785                 offset += 1;
1786
1787         *struct_offset    = offset;
1788         *struct_alignment = alignment;
1789         return member;
1790 }
1791
1792 void layout_struct_type(compound_type_t *type)
1793 {
1794         assert(type->compound != NULL);
1795
1796         compound_t *compound = type->compound;
1797         if (!compound->complete)
1798                 return;
1799         if (type->compound->layouted)
1800                 return;
1801
1802         il_size_t      offset    = 0;
1803         il_alignment_t alignment = compound->alignment;
1804         bool           need_pad  = false;
1805
1806         entity_t *entry = compound->members.entities;
1807         while (entry != NULL) {
1808                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1809                         entry = entry->base.next;
1810                         continue;
1811                 }
1812
1813                 type_t *m_type  = entry->declaration.type;
1814                 type_t *skipped = skip_typeref(m_type);
1815                 if (! is_type_valid(skipped)) {
1816                         entry = entry->base.next;
1817                         continue;
1818                 }
1819
1820                 if (skipped->kind == TYPE_BITFIELD) {
1821                         if (byte_order_big_endian) {
1822                                 entry = pack_bitfield_members_big_endian(&offset, &alignment,
1823                                                                          compound->packed,
1824                                                                          entry);
1825                         } else {
1826                                 entry = pack_bitfield_members(&offset, &alignment,
1827                                                               compound->packed, entry);
1828                         }
1829                         continue;
1830                 }
1831
1832                 il_alignment_t m_alignment = get_type_alignment(m_type);
1833                 if (m_alignment > alignment)
1834                         alignment = m_alignment;
1835
1836                 if (!compound->packed) {
1837                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1838
1839                         if (new_offset > offset) {
1840                                 need_pad = true;
1841                                 offset   = new_offset;
1842                         }
1843                 }
1844
1845                 entry->compound_member.offset = offset;
1846                 offset += get_type_size(m_type);
1847
1848                 entry = entry->base.next;
1849         }
1850
1851         if (!compound->packed) {
1852                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1853                 if (new_offset > offset) {
1854                         need_pad = true;
1855                         offset   = new_offset;
1856                 }
1857         }
1858
1859         if (need_pad) {
1860                 if (warning.padded) {
1861                         warningf(&compound->base.source_position, "'%T' needs padding",
1862                                  type);
1863                 }
1864         } else if (compound->packed && warning.packed) {
1865                 warningf(&compound->base.source_position,
1866                          "superfluous packed attribute on '%T'", type);
1867         }
1868
1869         compound->size      = offset;
1870         compound->alignment = alignment;
1871         compound->layouted  = true;
1872 }
1873
1874 void layout_union_type(compound_type_t *type)
1875 {
1876         assert(type->compound != NULL);
1877
1878         compound_t *compound = type->compound;
1879         if (! compound->complete)
1880                 return;
1881
1882         il_size_t      size      = 0;
1883         il_alignment_t alignment = compound->alignment;
1884
1885         entity_t *entry = compound->members.entities;
1886         for (; entry != NULL; entry = entry->base.next) {
1887                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1888                         continue;
1889
1890                 type_t *m_type = entry->declaration.type;
1891                 if (! is_type_valid(skip_typeref(m_type)))
1892                         continue;
1893
1894                 entry->compound_member.offset = 0;
1895                 il_size_t m_size = get_type_size(m_type);
1896                 if (m_size > size)
1897                         size = m_size;
1898                 il_alignment_t m_alignment = get_type_alignment(m_type);
1899                 if (m_alignment > alignment)
1900                         alignment = m_alignment;
1901         }
1902         size = (size + alignment - 1) & -alignment;
1903
1904         compound->size      = size;
1905         compound->alignment = alignment;
1906 }
1907
1908 static function_parameter_t *allocate_parameter(type_t *const type)
1909 {
1910         function_parameter_t *const param
1911                 = obstack_alloc(type_obst, sizeof(*param));
1912         memset(param, 0, sizeof(*param));
1913         param->type = type;
1914         return param;
1915 }
1916
1917 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1918                              type_t *argument_type2)
1919 {
1920         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1921         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1922         parameter1->next = parameter2;
1923
1924         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1925         type->function.return_type = return_type;
1926         type->function.parameters  = parameter1;
1927         type->function.linkage     = LINKAGE_C;
1928
1929         return identify_new_type(type);
1930 }
1931
1932 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1933 {
1934         function_parameter_t *const parameter = allocate_parameter(argument_type);
1935
1936         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1937         type->function.return_type = return_type;
1938         type->function.parameters  = parameter;
1939         type->function.linkage     = LINKAGE_C;
1940
1941         return identify_new_type(type);
1942 }
1943
1944 type_t *make_function_1_type_variadic(type_t *return_type,
1945                                       type_t *argument_type)
1946 {
1947         function_parameter_t *const parameter = allocate_parameter(argument_type);
1948
1949         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1950         type->function.return_type = return_type;
1951         type->function.parameters  = parameter;
1952         type->function.variadic    = true;
1953         type->function.linkage     = LINKAGE_C;
1954
1955         return identify_new_type(type);
1956 }
1957
1958 type_t *make_function_0_type(type_t *return_type)
1959 {
1960         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1961         type->function.return_type = return_type;
1962         type->function.parameters  = NULL;
1963         type->function.linkage     = LINKAGE_C;
1964
1965         return identify_new_type(type);
1966 }
1967
1968 type_t *make_function_type(type_t *return_type, int n_types,
1969                            type_t *const *argument_types,
1970                                                    decl_modifiers_t modifiers)
1971 {
1972         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1973         type->function.return_type = return_type;
1974         type->function.modifiers  |= modifiers;
1975         type->function.linkage     = LINKAGE_C;
1976
1977         function_parameter_t *last  = NULL;
1978         for (int i = 0; i < n_types; ++i) {
1979                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1980                 if (last == NULL) {
1981                         type->function.parameters = parameter;
1982                 } else {
1983                         last->next = parameter;
1984                 }
1985                 last = parameter;
1986         }
1987
1988         return identify_new_type(type);
1989 }
1990
1991 /**
1992  * Debug helper. Prints the given type to stdout.
1993  */
1994 static __attribute__((unused))
1995 void dbg_type(const type_t *type)
1996 {
1997         print_to_file(stderr);
1998         print_type(type);
1999         print_string("\n");
2000         fflush(stderr);
2001 }