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         if (type == NULL) {
 786                 print_string("nil type");
 787                 return;
 788         }
 789
 790         intern_print_type_pre(type);
 791         if (symbol != NULL) {
 792                 print_string(" ");
 793                 print_string(symbol->string);
 794         }
 795         if (type->kind == TYPE_FUNCTION) {
 796                 print_function_type_post(&type->function, parameters);
 797         } else {
 798                 intern_print_type_post(type);
 799         }
 800 }
 801
 802 /**
 803  * Duplicates a type.
 804  *
 805  * @param type  The type to copy.
 806  * @return A copy of the type.
 807  *
 808  * @note This does not produce a deep copy!
 809  */
 810 type_t *duplicate_type(const type_t *type)
 811 {
 812         size_t size = get_type_struct_size(type->kind);
 813
 814         type_t *copy = obstack_alloc(type_obst, size);
 815         memcpy(copy, type, size);
 816         copy->base.firm_type = NULL;
 817
 818         return copy;
 819 }
 820
 821 /**
 822  * Returns the unqualified type of a given type.
 823  *
 824  * @param type  The type.
 825  * @returns The unqualified type.
 826  */
 827 type_t *get_unqualified_type(type_t *type)
 828 {
 829         assert(!is_typeref(type));
 830
 831         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 832                 return type;
 833
 834         type_t *unqualified_type          = duplicate_type(type);
 835         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 836
 837         return identify_new_type(unqualified_type);
 838 }
 839
 840 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 841 {
 842         type_t *type = skip_typeref(orig_type);
 843
 844         type_t *copy;
 845         if (is_type_array(type)) {
 846                 /* For array types the element type has to be adjusted */
 847                 type_t *element_type      = type->array.element_type;
 848                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 849
 850                 if (qual_element_type == element_type)
 851                         return orig_type;
 852
 853                 copy                     = duplicate_type(type);
 854                 copy->array.element_type = qual_element_type;
 855         } else if (is_type_valid(type)) {
 856                 if ((type->base.qualifiers & qual) == qual)
 857                         return orig_type;
 858
 859                 copy                   = duplicate_type(type);
 860                 copy->base.qualifiers |= qual;
 861         } else {
 862                 return type;
 863         }
 864
 865         return identify_new_type(copy);
 866 }
 867
 868 /**
 869  * Check if a type is valid.
 870  *
 871  * @param type  The type to check.
 872  * @return true if type represents a valid type.
 873  */
 874 bool type_valid(const type_t *type)
 875 {
 876         return type->kind != TYPE_INVALID;
 877 }
 878
 879 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 880                                   atomic_type_flag_t flag)
 881 {
 882         assert(kind <= ATOMIC_TYPE_LAST);
 883         return (atomic_type_properties[kind].flags & flag) != 0;
 884 }
 885
 886 /**
 887  * Returns true if the given type is an integer type.
 888  *
 889  * @param type  The type to check.
 890  * @return True if type is an integer type.
 891  */
 892 bool is_type_integer(const type_t *type)
 893 {
 894         assert(!is_typeref(type));
 895
 896         if (type->kind == TYPE_ENUM)
 897                 return true;
 898         if (type->kind == TYPE_BITFIELD)
 899                 return true;
 900
 901         if (type->kind != TYPE_ATOMIC)
 902                 return false;
 903
 904         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 905 }
 906
 907 /**
 908  * Returns true if the given type is an enum type.
 909  *
 910  * @param type  The type to check.
 911  * @return True if type is an enum type.
 912  */
 913 bool is_type_enum(const type_t *type)
 914 {
 915         assert(!is_typeref(type));
 916         return type->kind == TYPE_ENUM;
 917 }
 918
 919 /**
 920  * Returns true if the given type is an floating point type.
 921  *
 922  * @param type  The type to check.
 923  * @return True if type is a floating point type.
 924  */
 925 bool is_type_float(const type_t *type)
 926 {
 927         assert(!is_typeref(type));
 928
 929         if (type->kind != TYPE_ATOMIC)
 930                 return false;
 931
 932         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 933 }
 934
 935 /**
 936  * Returns true if the given type is an complex type.
 937  *
 938  * @param type  The type to check.
 939  * @return True if type is a complex type.
 940  */
 941 bool is_type_complex(const type_t *type)
 942 {
 943         assert(!is_typeref(type));
 944
 945         if (type->kind != TYPE_ATOMIC)
 946                 return false;
 947
 948         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 949 }
 950
 951 /**
 952  * Returns true if the given type is a signed type.
 953  *
 954  * @param type  The type to check.
 955  * @return True if type is a signed type.
 956  */
 957 bool is_type_signed(const type_t *type)
 958 {
 959         assert(!is_typeref(type));
 960
 961         /* enum types are int for now */
 962         if (type->kind == TYPE_ENUM)
 963                 return true;
 964         if (type->kind == TYPE_BITFIELD)
 965                 return is_type_signed(type->bitfield.base_type);
 966
 967         if (type->kind != TYPE_ATOMIC)
 968                 return false;
 969
 970         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 971 }
 972
 973 /**
 974  * Returns true if the given type represents an arithmetic type.
 975  *
 976  * @param type  The type to check.
 977  * @return True if type represents an arithmetic type.
 978  */
 979 bool is_type_arithmetic(const type_t *type)
 980 {
 981         assert(!is_typeref(type));
 982
 983         switch(type->kind) {
 984         case TYPE_BITFIELD:
 985         case TYPE_ENUM:
 986                 return true;
 987         case TYPE_ATOMIC:
 988                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 989         case TYPE_COMPLEX:
 990                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 991         case TYPE_IMAGINARY:
 992                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 993         default:
 994                 return false;
 995         }
 996 }
 997
 998 /**
 999  * Returns true if the given type is an integer or float type.
1000  *
1001  * @param type  The type to check.
1002  * @return True if type is an integer or float type.
1003  */
1004 bool is_type_real(const type_t *type)
1005 {
1006         /* 6.2.5 (17) */
1007         return is_type_integer(type) || is_type_float(type);
1008 }
1009
1010 /**
1011  * Returns true if the given type represents a scalar type.
1012  *
1013  * @param type  The type to check.
1014  * @return True if type represents a scalar type.
1015  */
1016 bool is_type_scalar(const type_t *type)
1017 {
1018         assert(!is_typeref(type));
1019
1020         switch (type->kind) {
1021         case TYPE_POINTER: return true;
1022         case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1023         default:           break;
1024         }
1025
1026         return is_type_arithmetic(type);
1027 }
1028
1029 /**
1030  * Check if a given type is incomplete.
1031  *
1032  * @param type  The type to check.
1033  * @return True if the given type is incomplete (ie. just forward).
1034  */
1035 bool is_type_incomplete(const type_t *type)
1036 {
1037         assert(!is_typeref(type));
1038
1039         switch(type->kind) {
1040         case TYPE_COMPOUND_STRUCT:
1041         case TYPE_COMPOUND_UNION: {
1042                 const compound_type_t *compound_type = &type->compound;
1043                 return !compound_type->compound->complete;
1044         }
1045         case TYPE_ENUM:
1046                 return false;
1047
1048         case TYPE_ARRAY:
1049                 return type->array.size_expression == NULL
1050                         && !type->array.size_constant;
1051
1052         case TYPE_ATOMIC:
1053                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1054
1055         case TYPE_COMPLEX:
1056                 return type->complex.akind == ATOMIC_TYPE_VOID;
1057
1058         case TYPE_IMAGINARY:
1059                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1060
1061         case TYPE_BITFIELD:
1062         case TYPE_FUNCTION:
1063         case TYPE_POINTER:
1064         case TYPE_REFERENCE:
1065         case TYPE_BUILTIN:
1066         case TYPE_ERROR:
1067                 return false;
1068
1069         case TYPE_TYPEDEF:
1070         case TYPE_TYPEOF:
1071                 panic("is_type_incomplete called without typerefs skipped");
1072         case TYPE_INVALID:
1073                 break;
1074         }
1075
1076         panic("invalid type found");
1077 }
1078
1079 bool is_type_object(const type_t *type)
1080 {
1081         return !is_type_function(type) && !is_type_incomplete(type);
1082 }
1083
1084 bool is_builtin_va_list(type_t *type)
1085 {
1086         type_t *tp = skip_typeref(type);
1087
1088         return tp->kind == type_valist->kind &&
1089                tp->builtin.symbol == type_valist->builtin.symbol;
1090 }
1091
1092 /**
1093  * Check if two function types are compatible.
1094  */
1095 static bool function_types_compatible(const function_type_t *func1,
1096                                       const function_type_t *func2)
1097 {
1098         const type_t* const ret1 = skip_typeref(func1->return_type);
1099         const type_t* const ret2 = skip_typeref(func2->return_type);
1100         if (!types_compatible(ret1, ret2))
1101                 return false;
1102
1103         if (func1->linkage != func2->linkage)
1104                 return false;
1105
1106         cc_kind_t cc1 = func1->calling_convention;
1107         if (cc1 == CC_DEFAULT)
1108                 cc1 = default_calling_convention;
1109         cc_kind_t cc2 = func2->calling_convention;
1110         if (cc2 == CC_DEFAULT)
1111                 cc2 = default_calling_convention;
1112
1113         if (cc1 != cc2)
1114                 return false;
1115
1116         if (func1->variadic != func2->variadic)
1117                 return false;
1118
1119         /* can parameters be compared? */
1120         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1121                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1122                 return true;
1123
1124         /* TODO: handling of unspecified parameters not correct yet */
1125
1126         /* all argument types must be compatible */
1127         function_parameter_t *parameter1 = func1->parameters;
1128         function_parameter_t *parameter2 = func2->parameters;
1129         for ( ; parameter1 != NULL && parameter2 != NULL;
1130                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1131                 type_t *parameter1_type = skip_typeref(parameter1->type);
1132                 type_t *parameter2_type = skip_typeref(parameter2->type);
1133
1134                 parameter1_type = get_unqualified_type(parameter1_type);
1135                 parameter2_type = get_unqualified_type(parameter2_type);
1136
1137                 if (!types_compatible(parameter1_type, parameter2_type))
1138                         return false;
1139         }
1140         /* same number of arguments? */
1141         if (parameter1 != NULL || parameter2 != NULL)
1142                 return false;
1143
1144         return true;
1145 }
1146
1147 /**
1148  * Check if two array types are compatible.
1149  */
1150 static bool array_types_compatible(const array_type_t *array1,
1151                                    const array_type_t *array2)
1152 {
1153         type_t *element_type1 = skip_typeref(array1->element_type);
1154         type_t *element_type2 = skip_typeref(array2->element_type);
1155         if (!types_compatible(element_type1, element_type2))
1156                 return false;
1157
1158         if (!array1->size_constant || !array2->size_constant)
1159                 return true;
1160
1161         return array1->size == array2->size;
1162 }
1163
1164 /**
1165  * Check if two types are compatible.
1166  */
1167 bool types_compatible(const type_t *type1, const type_t *type2)
1168 {
1169         assert(!is_typeref(type1));
1170         assert(!is_typeref(type2));
1171
1172         /* shortcut: the same type is always compatible */
1173         if (type1 == type2)
1174                 return true;
1175
1176         if (!is_type_valid(type1) || !is_type_valid(type2))
1177                 return true;
1178
1179         if (type1->base.qualifiers != type2->base.qualifiers)
1180                 return false;
1181         if (type1->kind != type2->kind)
1182                 return false;
1183
1184         switch (type1->kind) {
1185         case TYPE_FUNCTION:
1186                 return function_types_compatible(&type1->function, &type2->function);
1187         case TYPE_ATOMIC:
1188                 return type1->atomic.akind == type2->atomic.akind;
1189         case TYPE_COMPLEX:
1190                 return type1->complex.akind == type2->complex.akind;
1191         case TYPE_IMAGINARY:
1192                 return type1->imaginary.akind == type2->imaginary.akind;
1193         case TYPE_ARRAY:
1194                 return array_types_compatible(&type1->array, &type2->array);
1195
1196         case TYPE_POINTER: {
1197                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1198                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1199                 return types_compatible(to1, to2);
1200         }
1201
1202         case TYPE_REFERENCE: {
1203                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1204                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1205                 return types_compatible(to1, to2);
1206         }
1207
1208         case TYPE_COMPOUND_STRUCT:
1209         case TYPE_COMPOUND_UNION: {
1210
1211
1212                 break;
1213         }
1214         case TYPE_ENUM:
1215         case TYPE_BUILTIN:
1216                 /* TODO: not implemented */
1217                 break;
1218
1219         case TYPE_BITFIELD:
1220                 /* not sure if this makes sense or is even needed, implement it if you
1221                  * really need it! */
1222                 panic("type compatibility check for bitfield type");
1223
1224         case TYPE_ERROR:
1225                 /* Hmm, the error type should be compatible to all other types */
1226                 return true;
1227         case TYPE_INVALID:
1228                 panic("invalid type found in compatible types");
1229         case TYPE_TYPEDEF:
1230         case TYPE_TYPEOF:
1231                 panic("typerefs not skipped in compatible types?!?");
1232         }
1233
1234         /* TODO: incomplete */
1235         return false;
1236 }
1237
1238 /**
1239  * Skip all typerefs and return the underlying type.
1240  */
1241 type_t *skip_typeref(type_t *type)
1242 {
1243         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1244
1245         while (true) {
1246                 switch (type->kind) {
1247                 case TYPE_ERROR:
1248                         return type;
1249                 case TYPE_TYPEDEF: {
1250                         qualifiers |= type->base.qualifiers;
1251
1252                         const typedef_type_t *typedef_type = &type->typedeft;
1253                         if (typedef_type->resolved_type != NULL) {
1254                                 type = typedef_type->resolved_type;
1255                                 break;
1256                         }
1257                         type = typedef_type->typedefe->type;
1258                         continue;
1259                 }
1260                 case TYPE_TYPEOF:
1261                         qualifiers |= type->base.qualifiers;
1262                         type        = type->typeoft.typeof_type;
1263                         continue;
1264                 default:
1265                         break;
1266                 }
1267                 break;
1268         }
1269
1270         if (qualifiers != TYPE_QUALIFIER_NONE) {
1271                 type_t *const copy = duplicate_type(type);
1272
1273                 /* for const with typedefed array type the element type has to be
1274                  * adjusted */
1275                 if (is_type_array(copy)) {
1276                         type_t *element_type           = copy->array.element_type;
1277                         element_type                   = duplicate_type(element_type);
1278                         element_type->base.qualifiers |= qualifiers;
1279                         copy->array.element_type       = element_type;
1280                 } else {
1281                         copy->base.qualifiers |= qualifiers;
1282                 }
1283
1284                 type = identify_new_type(copy);
1285         }
1286
1287         return type;
1288 }
1289
1290 unsigned get_type_size(type_t *type)
1291 {
1292         switch (type->kind) {
1293         case TYPE_INVALID:
1294                 break;
1295         case TYPE_ERROR:
1296                 return 0;
1297         case TYPE_ATOMIC:
1298                 return get_atomic_type_size(type->atomic.akind);
1299         case TYPE_COMPLEX:
1300                 return get_atomic_type_size(type->complex.akind) * 2;
1301         case TYPE_IMAGINARY:
1302                 return get_atomic_type_size(type->imaginary.akind);
1303         case TYPE_COMPOUND_UNION:
1304                 layout_union_type(&type->compound);
1305                 return type->compound.compound->size;
1306         case TYPE_COMPOUND_STRUCT:
1307                 layout_struct_type(&type->compound);
1308                 return type->compound.compound->size;
1309         case TYPE_ENUM:
1310                 return get_atomic_type_size(type->enumt.akind);
1311         case TYPE_FUNCTION:
1312                 return 0; /* non-const (but "address-const") */
1313         case TYPE_REFERENCE:
1314         case TYPE_POINTER:
1315                 /* TODO: make configurable by backend */
1316                 return 4;
1317         case TYPE_ARRAY: {
1318                 /* TODO: correct if element_type is aligned? */
1319                 il_size_t element_size = get_type_size(type->array.element_type);
1320                 return type->array.size * element_size;
1321         }
1322         case TYPE_BITFIELD:
1323                 return 0;
1324         case TYPE_BUILTIN:
1325                 return get_type_size(type->builtin.real_type);
1326         case TYPE_TYPEDEF:
1327                 return get_type_size(type->typedeft.typedefe->type);
1328         case TYPE_TYPEOF:
1329                 if (type->typeoft.typeof_type) {
1330                         return get_type_size(type->typeoft.typeof_type);
1331                 } else {
1332                         return get_type_size(type->typeoft.expression->base.type);
1333                 }
1334         }
1335         panic("invalid type in get_type_size");
1336 }
1337
1338 unsigned get_type_alignment(type_t *type)
1339 {
1340         switch (type->kind) {
1341         case TYPE_INVALID:
1342                 break;
1343         case TYPE_ERROR:
1344                 return 0;
1345         case TYPE_ATOMIC:
1346                 return get_atomic_type_alignment(type->atomic.akind);
1347         case TYPE_COMPLEX:
1348                 return get_atomic_type_alignment(type->complex.akind);
1349         case TYPE_IMAGINARY:
1350                 return get_atomic_type_alignment(type->imaginary.akind);
1351         case TYPE_COMPOUND_UNION:
1352                 layout_union_type(&type->compound);
1353                 return type->compound.compound->alignment;
1354         case TYPE_COMPOUND_STRUCT:
1355                 layout_struct_type(&type->compound);
1356                 return type->compound.compound->alignment;
1357         case TYPE_ENUM:
1358                 return get_atomic_type_alignment(type->enumt.akind);
1359         case TYPE_FUNCTION:
1360                 /* what is correct here? */
1361                 return 4;
1362         case TYPE_REFERENCE:
1363         case TYPE_POINTER:
1364                 /* TODO: make configurable by backend */
1365                 return 4;
1366         case TYPE_ARRAY:
1367                 return get_type_alignment(type->array.element_type);
1368         case TYPE_BITFIELD:
1369                 return 0;
1370         case TYPE_BUILTIN:
1371                 return get_type_alignment(type->builtin.real_type);
1372         case TYPE_TYPEDEF: {
1373                 il_alignment_t alignment
1374                         = get_type_alignment(type->typedeft.typedefe->type);
1375                 if (type->typedeft.typedefe->alignment > alignment)
1376                         alignment = type->typedeft.typedefe->alignment;
1377
1378                 return alignment;
1379         }
1380         case TYPE_TYPEOF:
1381                 if (type->typeoft.typeof_type) {
1382                         return get_type_alignment(type->typeoft.typeof_type);
1383                 } else {
1384                         return get_type_alignment(type->typeoft.expression->base.type);
1385                 }
1386         }
1387         panic("invalid type in get_type_alignment");
1388 }
1389
1390 decl_modifiers_t get_type_modifiers(const type_t *type)
1391 {
1392         switch(type->kind) {
1393         case TYPE_INVALID:
1394         case TYPE_ERROR:
1395                 break;
1396         case TYPE_COMPOUND_STRUCT:
1397         case TYPE_COMPOUND_UNION:
1398                 return type->compound.compound->modifiers;
1399         case TYPE_FUNCTION:
1400                 return type->function.modifiers;
1401         case TYPE_ENUM:
1402         case TYPE_ATOMIC:
1403         case TYPE_COMPLEX:
1404         case TYPE_IMAGINARY:
1405         case TYPE_REFERENCE:
1406         case TYPE_POINTER:
1407         case TYPE_BITFIELD:
1408         case TYPE_ARRAY:
1409                 return 0;
1410         case TYPE_BUILTIN:
1411                 return get_type_modifiers(type->builtin.real_type);
1412         case TYPE_TYPEDEF: {
1413                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1414                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1415                 return modifiers;
1416         }
1417         case TYPE_TYPEOF:
1418                 if (type->typeoft.typeof_type) {
1419                         return get_type_modifiers(type->typeoft.typeof_type);
1420                 } else {
1421                         return get_type_modifiers(type->typeoft.expression->base.type);
1422                 }
1423         }
1424         panic("invalid type found in get_type_modifiers");
1425 }
1426
1427 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1428 {
1429         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1430
1431         while (true) {
1432                 switch (type->base.kind) {
1433                 case TYPE_ERROR:
1434                         return TYPE_QUALIFIER_NONE;
1435                 case TYPE_TYPEDEF:
1436                         qualifiers |= type->base.qualifiers;
1437                         const typedef_type_t *typedef_type = &type->typedeft;
1438                         if (typedef_type->resolved_type != NULL)
1439                                 type = typedef_type->resolved_type;
1440                         else
1441                                 type = typedef_type->typedefe->type;
1442                         continue;
1443                 case TYPE_TYPEOF:
1444                         type = type->typeoft.typeof_type;
1445                         continue;
1446                 case TYPE_ARRAY:
1447                         if (skip_array_type) {
1448                                 type = type->array.element_type;
1449                                 continue;
1450                         }
1451                         break;
1452                 default:
1453                         break;
1454                 }
1455                 break;
1456         }
1457         return type->base.qualifiers | qualifiers;
1458 }
1459
1460 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1461 {
1462         assert(kind <= ATOMIC_TYPE_LAST);
1463         return atomic_type_properties[kind].size;
1464 }
1465
1466 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1467 {
1468         assert(kind <= ATOMIC_TYPE_LAST);
1469         return atomic_type_properties[kind].alignment;
1470 }
1471
1472 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1473 {
1474         assert(kind <= ATOMIC_TYPE_LAST);
1475         return atomic_type_properties[kind].flags;
1476 }
1477
1478 atomic_type_kind_t get_intptr_kind(void)
1479 {
1480         if (machine_size <= 32)
1481                 return ATOMIC_TYPE_INT;
1482         else if (machine_size <= 64)
1483                 return ATOMIC_TYPE_LONG;
1484         else
1485                 return ATOMIC_TYPE_LONGLONG;
1486 }
1487
1488 atomic_type_kind_t get_uintptr_kind(void)
1489 {
1490         if (machine_size <= 32)
1491                 return ATOMIC_TYPE_UINT;
1492         else if (machine_size <= 64)
1493                 return ATOMIC_TYPE_ULONG;
1494         else
1495                 return ATOMIC_TYPE_ULONGLONG;
1496 }
1497
1498 /**
1499  * Find the atomic type kind representing a given size (signed).
1500  */
1501 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1502 {
1503         static atomic_type_kind_t kinds[32];
1504
1505         assert(size < 32);
1506         atomic_type_kind_t kind = kinds[size];
1507         if (kind == ATOMIC_TYPE_INVALID) {
1508                 static const atomic_type_kind_t possible_kinds[] = {
1509                         ATOMIC_TYPE_SCHAR,
1510                         ATOMIC_TYPE_SHORT,
1511                         ATOMIC_TYPE_INT,
1512                         ATOMIC_TYPE_LONG,
1513                         ATOMIC_TYPE_LONGLONG
1514                 };
1515                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1516                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1517                                 kind = possible_kinds[i];
1518                                 break;
1519                         }
1520                 }
1521                 kinds[size] = kind;
1522         }
1523         return kind;
1524 }
1525
1526 /**
1527  * Find the atomic type kind representing a given size (signed).
1528  */
1529 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1530 {
1531         static atomic_type_kind_t kinds[32];
1532
1533         assert(size < 32);
1534         atomic_type_kind_t kind = kinds[size];
1535         if (kind == ATOMIC_TYPE_INVALID) {
1536                 static const atomic_type_kind_t possible_kinds[] = {
1537                         ATOMIC_TYPE_UCHAR,
1538                         ATOMIC_TYPE_USHORT,
1539                         ATOMIC_TYPE_UINT,
1540                         ATOMIC_TYPE_ULONG,
1541                         ATOMIC_TYPE_ULONGLONG
1542                 };
1543                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1544                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1545                                 kind = possible_kinds[i];
1546                                 break;
1547                         }
1548                 }
1549                 kinds[size] = kind;
1550         }
1551         return kind;
1552 }
1553
1554 /**
1555  * Hash the given type and return the "singleton" version
1556  * of it.
1557  */
1558 type_t *identify_new_type(type_t *type)
1559 {
1560         type_t *result = typehash_insert(type);
1561         if (result != type) {
1562                 obstack_free(type_obst, type);
1563         }
1564         return result;
1565 }
1566
1567 /**
1568  * Creates a new atomic type.
1569  *
1570  * @param akind       The kind of the atomic type.
1571  * @param qualifiers  Type qualifiers for the new type.
1572  */
1573 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1574 {
1575         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1576         memset(type, 0, sizeof(atomic_type_t));
1577
1578         type->kind            = TYPE_ATOMIC;
1579         type->base.qualifiers = qualifiers;
1580         type->atomic.akind    = akind;
1581
1582         return identify_new_type(type);
1583 }
1584
1585 /**
1586  * Creates a new complex type.
1587  *
1588  * @param akind       The kind of the atomic type.
1589  * @param qualifiers  Type qualifiers for the new type.
1590  */
1591 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1592 {
1593         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1594         memset(type, 0, sizeof(complex_type_t));
1595
1596         type->kind            = TYPE_COMPLEX;
1597         type->base.qualifiers = qualifiers;
1598         type->complex.akind   = akind;
1599
1600         return identify_new_type(type);
1601 }
1602
1603 /**
1604  * Creates a new imaginary type.
1605  *
1606  * @param akind       The kind of the atomic type.
1607  * @param qualifiers  Type qualifiers for the new type.
1608  */
1609 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1610 {
1611         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1612         memset(type, 0, sizeof(imaginary_type_t));
1613
1614         type->kind            = TYPE_IMAGINARY;
1615         type->base.qualifiers = qualifiers;
1616         type->imaginary.akind = akind;
1617
1618         return identify_new_type(type);
1619 }
1620
1621 /**
1622  * Creates a new pointer type.
1623  *
1624  * @param points_to   The points-to type for the new type.
1625  * @param qualifiers  Type qualifiers for the new type.
1626  */
1627 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1628 {
1629         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1630         memset(type, 0, sizeof(pointer_type_t));
1631
1632         type->kind                  = TYPE_POINTER;
1633         type->base.qualifiers       = qualifiers;
1634         type->pointer.points_to     = points_to;
1635         type->pointer.base_variable = NULL;
1636
1637         return identify_new_type(type);
1638 }
1639
1640 /**
1641  * Creates a new reference type.
1642  *
1643  * @param refers_to   The referred-to type for the new type.
1644  */
1645 type_t *make_reference_type(type_t *refers_to)
1646 {
1647         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1648         memset(type, 0, sizeof(reference_type_t));
1649
1650         type->kind                = TYPE_REFERENCE;
1651         type->base.qualifiers     = 0;
1652         type->reference.refers_to = refers_to;
1653
1654         return identify_new_type(type);
1655 }
1656
1657 /**
1658  * Creates a new based pointer type.
1659  *
1660  * @param points_to   The points-to type for the new type.
1661  * @param qualifiers  Type qualifiers for the new type.
1662  * @param variable    The based variable
1663  */
1664 type_t *make_based_pointer_type(type_t *points_to,
1665                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1666 {
1667         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1668         memset(type, 0, sizeof(pointer_type_t));
1669
1670         type->kind                  = TYPE_POINTER;
1671         type->base.qualifiers       = qualifiers;
1672         type->pointer.points_to     = points_to;
1673         type->pointer.base_variable = variable;
1674
1675         return identify_new_type(type);
1676 }
1677
1678
1679 type_t *make_array_type(type_t *element_type, size_t size,
1680                         type_qualifiers_t qualifiers)
1681 {
1682         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1683         memset(type, 0, sizeof(array_type_t));
1684
1685         type->kind                = TYPE_ARRAY;
1686         type->base.qualifiers     = qualifiers;
1687         type->array.element_type  = element_type;
1688         type->array.size          = size;
1689         type->array.size_constant = true;
1690
1691         return identify_new_type(type);
1692 }
1693
1694 static entity_t *pack_bitfield_members_big_endian(il_size_t *struct_offset,
1695                 il_alignment_t *struct_alignment, bool packed, entity_t *first)
1696 {
1697         type_t        *current_base_type = NULL;
1698         il_size_t      offset            = *struct_offset;
1699         il_alignment_t alignment         = *struct_alignment;
1700         size_t         bit_offset        = 0;
1701
1702         if (packed)
1703                 panic("packed bitfields on big-endian arch not supported yet");
1704
1705         entity_t *member;
1706         for (member = first; member != NULL; member = member->base.next) {
1707                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1708                         continue;
1709
1710                 type_t *type = member->declaration.type;
1711                 if (type->kind != TYPE_BITFIELD)
1712                         break;
1713
1714                 size_t  bit_size  = type->bitfield.bit_size;
1715                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1716
1717                 /* see if we need to start a new "bucket" */
1718                 if (base_type != current_base_type || bit_size > bit_offset) {
1719                         if (current_base_type != NULL)
1720                                 offset += get_type_size(current_base_type);
1721
1722                         current_base_type = base_type;
1723                         il_alignment_t base_alignment = get_type_alignment(base_type);
1724                         il_alignment_t alignment_mask = base_alignment-1;
1725                         if (base_alignment > alignment)
1726                                 alignment = base_alignment;
1727                         offset     = (offset + base_alignment-1) & ~alignment_mask;
1728                         bit_offset = get_type_size(base_type) * BITS_PER_BYTE;
1729                         assert(bit_offset >= bit_size);
1730                 }
1731
1732                 bit_offset -= bit_size;
1733                 member->compound_member.offset     = offset;
1734                 member->compound_member.bit_offset = bit_offset;
1735         }
1736
1737         if (current_base_type != NULL)
1738                 offset += get_type_size(current_base_type);
1739
1740         *struct_offset    = offset;
1741         *struct_alignment = alignment;
1742         return member;
1743 }
1744
1745 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1746                                        il_alignment_t *struct_alignment,
1747                                                                            bool packed, entity_t *first)
1748 {
1749         il_size_t      offset     = *struct_offset;
1750         il_alignment_t alignment  = *struct_alignment;
1751         size_t         bit_offset = 0;
1752
1753         entity_t *member;
1754         for (member = first; member != NULL; member = member->base.next) {
1755                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1756                         continue;
1757
1758                 type_t *type = member->declaration.type;
1759                 if (type->kind != TYPE_BITFIELD)
1760                         break;
1761
1762                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1763                 il_alignment_t base_alignment = get_type_alignment(base_type);
1764                 il_alignment_t alignment_mask = base_alignment-1;
1765                 if (base_alignment > alignment)
1766                         alignment = base_alignment;
1767
1768                 size_t bit_size = type->bitfield.bit_size;
1769                 if (!packed) {
1770                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1771                         offset     &= ~alignment_mask;
1772                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1773
1774                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1775                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1776                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1777                                 bit_offset = 0;
1778                         }
1779                 }
1780
1781                 member->compound_member.offset     = offset;
1782                 member->compound_member.bit_offset = bit_offset;
1783
1784                 bit_offset += bit_size;
1785                 offset     += bit_offset / BITS_PER_BYTE;
1786                 bit_offset %= BITS_PER_BYTE;
1787         }
1788
1789         if (bit_offset > 0)
1790                 offset += 1;
1791
1792         *struct_offset    = offset;
1793         *struct_alignment = alignment;
1794         return member;
1795 }
1796
1797 void layout_struct_type(compound_type_t *type)
1798 {
1799         assert(type->compound != NULL);
1800
1801         compound_t *compound = type->compound;
1802         if (!compound->complete)
1803                 return;
1804         if (type->compound->layouted)
1805                 return;
1806
1807         il_size_t      offset    = 0;
1808         il_alignment_t alignment = compound->alignment;
1809         bool           need_pad  = false;
1810
1811         entity_t *entry = compound->members.entities;
1812         while (entry != NULL) {
1813                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1814                         entry = entry->base.next;
1815                         continue;
1816                 }
1817
1818                 type_t *m_type  = entry->declaration.type;
1819                 type_t *skipped = skip_typeref(m_type);
1820                 if (! is_type_valid(skipped)) {
1821                         entry = entry->base.next;
1822                         continue;
1823                 }
1824
1825                 if (skipped->kind == TYPE_BITFIELD) {
1826                         if (byte_order_big_endian) {
1827                                 entry = pack_bitfield_members_big_endian(&offset, &alignment,
1828                                                                          compound->packed,
1829                                                                          entry);
1830                         } else {
1831                                 entry = pack_bitfield_members(&offset, &alignment,
1832                                                               compound->packed, entry);
1833                         }
1834                         continue;
1835                 }
1836
1837                 il_alignment_t m_alignment = get_type_alignment(m_type);
1838                 if (m_alignment > alignment)
1839                         alignment = m_alignment;
1840
1841                 if (!compound->packed) {
1842                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1843
1844                         if (new_offset > offset) {
1845                                 need_pad = true;
1846                                 offset   = new_offset;
1847                         }
1848                 }
1849
1850                 entry->compound_member.offset = offset;
1851                 offset += get_type_size(m_type);
1852
1853                 entry = entry->base.next;
1854         }
1855
1856         if (!compound->packed) {
1857                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1858                 if (new_offset > offset) {
1859                         need_pad = true;
1860                         offset   = new_offset;
1861                 }
1862         }
1863
1864         if (need_pad) {
1865                 if (warning.padded) {
1866                         warningf(&compound->base.source_position, "'%T' needs padding",
1867                                  type);
1868                 }
1869         } else if (compound->packed && warning.packed) {
1870                 warningf(&compound->base.source_position,
1871                          "superfluous packed attribute on '%T'", type);
1872         }
1873
1874         compound->size      = offset;
1875         compound->alignment = alignment;
1876         compound->layouted  = true;
1877 }
1878
1879 void layout_union_type(compound_type_t *type)
1880 {
1881         assert(type->compound != NULL);
1882
1883         compound_t *compound = type->compound;
1884         if (! compound->complete)
1885                 return;
1886
1887         il_size_t      size      = 0;
1888         il_alignment_t alignment = compound->alignment;
1889
1890         entity_t *entry = compound->members.entities;
1891         for (; entry != NULL; entry = entry->base.next) {
1892                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1893                         continue;
1894
1895                 type_t *m_type = entry->declaration.type;
1896                 if (! is_type_valid(skip_typeref(m_type)))
1897                         continue;
1898
1899                 entry->compound_member.offset = 0;
1900                 il_size_t m_size = get_type_size(m_type);
1901                 if (m_size > size)
1902                         size = m_size;
1903                 il_alignment_t m_alignment = get_type_alignment(m_type);
1904                 if (m_alignment > alignment)
1905                         alignment = m_alignment;
1906         }
1907         size = (size + alignment - 1) & -alignment;
1908
1909         compound->size      = size;
1910         compound->alignment = alignment;
1911 }
1912
1913 static function_parameter_t *allocate_parameter(type_t *const type)
1914 {
1915         function_parameter_t *const param
1916                 = obstack_alloc(type_obst, sizeof(*param));
1917         memset(param, 0, sizeof(*param));
1918         param->type = type;
1919         return param;
1920 }
1921
1922 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1923                              type_t *argument_type2)
1924 {
1925         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1926         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1927         parameter1->next = parameter2;
1928
1929         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1930         type->function.return_type = return_type;
1931         type->function.parameters  = parameter1;
1932         type->function.linkage     = LINKAGE_C;
1933
1934         return identify_new_type(type);
1935 }
1936
1937 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1938 {
1939         function_parameter_t *const parameter = allocate_parameter(argument_type);
1940
1941         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1942         type->function.return_type = return_type;
1943         type->function.parameters  = parameter;
1944         type->function.linkage     = LINKAGE_C;
1945
1946         return identify_new_type(type);
1947 }
1948
1949 type_t *make_function_1_type_variadic(type_t *return_type,
1950                                       type_t *argument_type)
1951 {
1952         function_parameter_t *const parameter = allocate_parameter(argument_type);
1953
1954         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1955         type->function.return_type = return_type;
1956         type->function.parameters  = parameter;
1957         type->function.variadic    = true;
1958         type->function.linkage     = LINKAGE_C;
1959
1960         return identify_new_type(type);
1961 }
1962
1963 type_t *make_function_0_type(type_t *return_type)
1964 {
1965         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1966         type->function.return_type = return_type;
1967         type->function.parameters  = NULL;
1968         type->function.linkage     = LINKAGE_C;
1969
1970         return identify_new_type(type);
1971 }
1972
1973 type_t *make_function_type(type_t *return_type, int n_types,
1974                            type_t *const *argument_types,
1975                                                    decl_modifiers_t modifiers)
1976 {
1977         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1978         type->function.return_type = return_type;
1979         type->function.modifiers  |= modifiers;
1980         type->function.linkage     = LINKAGE_C;
1981
1982         function_parameter_t *last  = NULL;
1983         for (int i = 0; i < n_types; ++i) {
1984                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1985                 if (last == NULL) {
1986                         type->function.parameters = parameter;
1987                 } else {
1988                         last->next = parameter;
1989                 }
1990                 last = parameter;
1991         }
1992
1993         return identify_new_type(type);
1994 }
1995
1996 /**
1997  * Debug helper. Prints the given type to stdout.
1998  */
1999 static __attribute__((unused))
2000 void dbg_type(const type_t *type)
2001 {
2002         print_to_file(stderr);
2003         print_type(type);
2004         print_string("\n");
2005         fflush(stderr);
2006 }