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