nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2012 Matthias Braun <matze@braunis.de>
   4  */
   5 #include <config.h>
   6
   7 #include <stdio.h>
   8 #include <assert.h>
   9
  10 #include "type_t.h"
  11 #include "types.h"
  12 #include "entity_t.h"
  13 #include "symbol_t.h"
  14 #include "type_hash.h"
  15 #include "adt/error.h"
  16 #include "adt/util.h"
  17 #include "lang_features.h"
  18 #include "warning.h"
  19 #include "diagnostic.h"
  20 #include "printer.h"
  21 #include "separator_t.h"
  22
  23 /** The default calling convention. */
  24 cc_kind_t default_calling_convention = CC_CDECL;
  25
  26 static struct obstack type_obst;
  27 static bool           print_implicit_array_size = false;
  28
  29 static void intern_print_type_pre(const type_t *type);
  30 static void intern_print_type_post(const type_t *type);
  31
  32 /**
  33  * Returns the size of a type node.
  34  *
  35  * @param kind  the type kind
  36  */
  37 static size_t get_type_struct_size(type_kind_t kind)
  38 {
  39         static const size_t sizes[] = {
  40                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  41                 [TYPE_IMAGINARY]       = sizeof(atomic_type_t),
  42                 [TYPE_COMPLEX]         = sizeof(atomic_type_t),
  43                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  44                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  45                 [TYPE_ENUM]            = sizeof(enum_type_t),
  46                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  47                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  48                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  49                 [TYPE_ARRAY]           = sizeof(array_type_t),
  50                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  51                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  52         };
  53         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  54         assert(kind <= TYPE_TYPEOF);
  55         assert(sizes[kind] != 0);
  56         return sizes[kind];
  57 }
  58
  59 type_t *allocate_type_zero(type_kind_t kind)
  60 {
  61         size_t  const size = get_type_struct_size(kind);
  62         type_t *const res  = obstack_alloc(&type_obst, size);
  63         memset(res, 0, size);
  64         res->base.kind = kind;
  65
  66         return res;
  67 }
  68
  69 /**
  70  * Properties of atomic types.
  71  */
  72 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  73         [ATOMIC_TYPE_VOID] = {
  74                 .size      = 1,
  75                 .alignment = 1,
  76                 .flags     = ATOMIC_TYPE_FLAG_NONE,
  77                 .rank      = 0,
  78         },
  79         [ATOMIC_TYPE_BOOL] = {
  80                 .size       = 1,
  81                 .alignment  = 1,
  82                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  83                 .rank       = 1,
  84         },
  85         [ATOMIC_TYPE_CHAR] = {
  86                 .size      = 1,
  87                 .alignment = 1,
  88                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  89                 .rank      = 2,
  90         },
  91         [ATOMIC_TYPE_SCHAR] = {
  92                 .size      = 1,
  93                 .alignment = 1,
  94                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  95                            | ATOMIC_TYPE_FLAG_SIGNED,
  96                 .rank      = 2,
  97         },
  98         [ATOMIC_TYPE_UCHAR] = {
  99                 .size      = 1,
 100                 .alignment = 1,
 101                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 102                 .rank      = 2,
 103         },
 104         [ATOMIC_TYPE_SHORT] = {
 105                 .size       = 2,
 106                 .alignment  = 2,
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 108                               | ATOMIC_TYPE_FLAG_SIGNED,
 109                 .rank       = 3,
 110         },
 111         [ATOMIC_TYPE_USHORT] = {
 112                 .size       = 2,
 113                 .alignment  = 2,
 114                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 115                 .rank       = 3,
 116         },
 117         [ATOMIC_TYPE_INT] = {
 118                 .size       = (unsigned) -1,
 119                 .alignment  = (unsigned) -1,
 120                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 121                               | ATOMIC_TYPE_FLAG_SIGNED,
 122                 .rank       = 4,
 123         },
 124         [ATOMIC_TYPE_UINT] = {
 125                 .size       = (unsigned) -1,
 126                 .alignment  = (unsigned) -1,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 128                 .rank       = 4,
 129         },
 130         [ATOMIC_TYPE_LONG] = {
 131                 .size       = (unsigned) -1,
 132                 .alignment  = (unsigned) -1,
 133                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 134                               | ATOMIC_TYPE_FLAG_SIGNED,
 135                 .rank       = 5,
 136         },
 137         [ATOMIC_TYPE_ULONG] = {
 138                 .size       = (unsigned) -1,
 139                 .alignment  = (unsigned) -1,
 140                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 141                 .rank       = 5,
 142         },
 143         [ATOMIC_TYPE_LONGLONG] = {
 144                 .size       = 8,
 145                 .alignment  = 8,
 146                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 147                               | ATOMIC_TYPE_FLAG_SIGNED,
 148                 .rank       = 6,
 149         },
 150         [ATOMIC_TYPE_ULONGLONG] = {
 151                 .size       = 8,
 152                 .alignment  = 8,
 153                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 154                 .rank       = 6,
 155         },
 156         [ATOMIC_TYPE_FLOAT] = {
 157                 .size       = 4,
 158                 .alignment  = 4,
 159                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 160                               | ATOMIC_TYPE_FLAG_SIGNED,
 161                 .rank       = 0,
 162         },
 163         [ATOMIC_TYPE_DOUBLE] = {
 164                 .size       = 8,
 165                 .alignment  = 8,
 166                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 167                               | ATOMIC_TYPE_FLAG_SIGNED,
 168                 .rank       = 0,
 169         },
 170         [ATOMIC_TYPE_WCHAR_T] = {
 171                 .size      = (unsigned)-1,
 172                 .alignment = (unsigned)-1,
 173                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 174                 .rank      = (unsigned)-1,
 175         },
 176 };
 177 atomic_type_properties_t pointer_properties = {
 178         .size      = 4,
 179         .alignment = 4,
 180         .flags     = ATOMIC_TYPE_FLAG_NONE,
 181 };
 182
 183 static inline bool is_po2(unsigned x)
 184 {
 185         return (x & (x-1)) == 0;
 186 }
 187
 188 void init_types(unsigned machine_size)
 189 {
 190         obstack_init(&type_obst);
 191
 192         atomic_type_properties_t *props = atomic_type_properties;
 193
 194         /* atempt to set some sane defaults based on machine size */
 195
 196         unsigned int_size   = machine_size < 32 ? 2 : 4;
 197         unsigned long_size  = machine_size < 64 ? 4 : 8;
 198
 199         props[ATOMIC_TYPE_INT].size        = int_size;
 200         props[ATOMIC_TYPE_INT].alignment   = int_size;
 201         props[ATOMIC_TYPE_UINT].size       = int_size;
 202         props[ATOMIC_TYPE_UINT].alignment  = int_size;
 203         props[ATOMIC_TYPE_LONG].size       = long_size;
 204         props[ATOMIC_TYPE_LONG].alignment  = long_size;
 205         props[ATOMIC_TYPE_ULONG].size      = long_size;
 206         props[ATOMIC_TYPE_ULONG].alignment = long_size;
 207
 208         pointer_properties.size             = long_size;
 209         pointer_properties.alignment        = long_size;
 210         pointer_properties.struct_alignment = long_size;
 211
 212         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 213         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 214
 215         /* set struct alignments to the same value as alignment */
 216         for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) {
 217                 props[i].struct_alignment = props[i].alignment;
 218         }
 219 }
 220
 221 void exit_types(void)
 222 {
 223         obstack_free(&type_obst, NULL);
 224 }
 225
 226 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 227 {
 228         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 229         if (qualifiers & TYPE_QUALIFIER_CONST) {
 230                 print_string(&" const"[sep]);
 231                 sep = 0;
 232         }
 233         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 234                 print_string(&" volatile"[sep]);
 235                 sep = 0;
 236         }
 237         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 238                 print_string(&" restrict"[sep]);
 239                 sep = 0;
 240         }
 241         if (sep == 0 && q & QUAL_SEP_END)
 242                 print_char(' ');
 243 }
 244
 245 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 246 {
 247         switch (kind) {
 248         case ATOMIC_TYPE_VOID:        return "void";
 249         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 250         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 251         case ATOMIC_TYPE_CHAR:        return "char";
 252         case ATOMIC_TYPE_SCHAR:       return "signed char";
 253         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 254         case ATOMIC_TYPE_INT:         return "int";
 255         case ATOMIC_TYPE_UINT:        return "unsigned int";
 256         case ATOMIC_TYPE_SHORT:       return "short";
 257         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 258         case ATOMIC_TYPE_LONG:        return "long";
 259         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 260         case ATOMIC_TYPE_LONGLONG:    return "long long";
 261         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 262         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 263         case ATOMIC_TYPE_FLOAT:       return "float";
 264         case ATOMIC_TYPE_DOUBLE:      return "double";
 265         }
 266         return "INVALIDATOMIC";
 267 }
 268
 269 /**
 270  * Prints the name of an atomic type kinds.
 271  *
 272  * @param kind  The type kind.
 273  */
 274 static void print_atomic_kinds(atomic_type_kind_t kind)
 275 {
 276         const char *s = get_atomic_kind_name(kind);
 277         print_string(s);
 278 }
 279
 280 /**
 281  * Prints the name of an atomic type.
 282  *
 283  * @param type  The type.
 284  */
 285 static void print_atomic_type(const atomic_type_t *type)
 286 {
 287         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 288         print_atomic_kinds(type->akind);
 289 }
 290
 291 /**
 292  * Prints the name of a complex type.
 293  *
 294  * @param type  The type.
 295  */
 296 static void print_complex_type(const atomic_type_t *type)
 297 {
 298         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 299         print_string("_Complex ");
 300         print_atomic_kinds(type->akind);
 301 }
 302
 303 /**
 304  * Prints the name of an imaginary type.
 305  *
 306  * @param type  The type.
 307  */
 308 static void print_imaginary_type(const atomic_type_t *type)
 309 {
 310         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 311         print_string("_Imaginary ");
 312         print_atomic_kinds(type->akind);
 313 }
 314
 315 /**
 316  * Print the first part (the prefix) of a type.
 317  *
 318  * @param type   The type to print.
 319  */
 320 static void print_function_type_pre(const function_type_t *type)
 321 {
 322         switch (type->linkage) {
 323                 case LINKAGE_C:
 324                         if (c_mode & _CXX)
 325                                 print_string("extern \"C\" ");
 326                         break;
 327
 328                 case LINKAGE_CXX:
 329                         if (!(c_mode & _CXX))
 330                                 print_string("extern \"C++\" ");
 331                         break;
 332         }
 333
 334         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 335
 336         intern_print_type_pre(type->return_type);
 337
 338         cc_kind_t cc = type->calling_convention;
 339 restart:
 340         switch (cc) {
 341         case CC_CDECL:    print_string(" __cdecl");    break;
 342         case CC_STDCALL:  print_string(" __stdcall");  break;
 343         case CC_FASTCALL: print_string(" __fastcall"); break;
 344         case CC_THISCALL: print_string(" __thiscall"); break;
 345         case CC_DEFAULT:
 346                 if (default_calling_convention != CC_CDECL) {
 347                         /* show the default calling convention if its not cdecl */
 348                         cc = default_calling_convention;
 349                         goto restart;
 350                 }
 351                 break;
 352         }
 353 }
 354
 355 /**
 356  * Print the second part (the postfix) of a type.
 357  *
 358  * @param type   The type to print.
 359  */
 360 static void print_function_type_post(const function_type_t *type,
 361                                      const scope_t *parameters)
 362 {
 363         print_char('(');
 364         separator_t sep = { "", ", " };
 365         if (parameters == NULL) {
 366                 function_parameter_t *parameter = type->parameters;
 367                 for ( ; parameter != NULL; parameter = parameter->next) {
 368                         print_string(sep_next(&sep));
 369                         print_type(parameter->type);
 370                 }
 371         } else {
 372                 entity_t *parameter = parameters->entities;
 373                 for (; parameter != NULL; parameter = parameter->base.next) {
 374                         if (parameter->kind != ENTITY_PARAMETER)
 375                                 continue;
 376
 377                         print_string(sep_next(&sep));
 378                         const type_t *const param_type = parameter->declaration.type;
 379                         if (param_type == NULL) {
 380                                 print_string(parameter->base.symbol->string);
 381                         } else {
 382                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 383                         }
 384                 }
 385         }
 386         if (type->variadic) {
 387                 print_string(sep_next(&sep));
 388                 print_string("...");
 389         }
 390         if (sep_at_first(&sep) && !type->unspecified_parameters) {
 391                 print_string("void");
 392         }
 393         print_char(')');
 394
 395         intern_print_type_post(type->return_type);
 396 }
 397
 398 /**
 399  * Prints the prefix part of a pointer type.
 400  *
 401  * @param type   The pointer type.
 402  */
 403 static void print_pointer_type_pre(const pointer_type_t *type)
 404 {
 405         type_t const *const points_to = type->points_to;
 406         intern_print_type_pre(points_to);
 407         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 408                 print_string(" (");
 409         variable_t *const variable = type->base_variable;
 410         if (variable != NULL) {
 411                 print_string(" __based(");
 412                 print_string(variable->base.base.symbol->string);
 413                 print_string(") ");
 414         }
 415         print_char('*');
 416         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 417 }
 418
 419 /**
 420  * Prints the postfix part of a pointer type.
 421  *
 422  * @param type   The pointer type.
 423  */
 424 static void print_pointer_type_post(const pointer_type_t *type)
 425 {
 426         type_t const *const points_to = type->points_to;
 427         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 428                 print_char(')');
 429         intern_print_type_post(points_to);
 430 }
 431
 432 /**
 433  * Prints the prefix part of a reference type.
 434  *
 435  * @param type   The reference type.
 436  */
 437 static void print_reference_type_pre(const reference_type_t *type)
 438 {
 439         type_t const *const refers_to = type->refers_to;
 440         intern_print_type_pre(refers_to);
 441         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 442                 print_string(" (");
 443         print_char('&');
 444 }
 445
 446 /**
 447  * Prints the postfix part of a reference type.
 448  *
 449  * @param type   The reference type.
 450  */
 451 static void print_reference_type_post(const reference_type_t *type)
 452 {
 453         type_t const *const refers_to = type->refers_to;
 454         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 455                 print_char(')');
 456         intern_print_type_post(refers_to);
 457 }
 458
 459 /**
 460  * Prints the prefix part of an array type.
 461  *
 462  * @param type   The array type.
 463  */
 464 static void print_array_type_pre(const array_type_t *type)
 465 {
 466         intern_print_type_pre(type->element_type);
 467 }
 468
 469 /**
 470  * Prints the postfix part of an array type.
 471  *
 472  * @param type   The array type.
 473  */
 474 static void print_array_type_post(const array_type_t *type)
 475 {
 476         print_char('[');
 477         if (type->is_static) {
 478                 print_string("static ");
 479         }
 480         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 481         if (type->size_expression != NULL
 482                         && (print_implicit_array_size || !type->has_implicit_size)) {
 483                 print_expression(type->size_expression);
 484         }
 485         print_char(']');
 486         intern_print_type_post(type->element_type);
 487 }
 488
 489 void print_enum_definition(const enum_t *enume)
 490 {
 491         print_string("{\n");
 492
 493         change_indent(1);
 494
 495         entity_t *entry = enume->base.next;
 496         for ( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 497                entry = entry->base.next) {
 498
 499                 print_indent();
 500                 print_string(entry->base.symbol->string);
 501                 if (entry->enum_value.value != NULL) {
 502                         print_string(" = ");
 503                         print_expression(entry->enum_value.value);
 504                 }
 505                 print_string(",\n");
 506         }
 507
 508         change_indent(-1);
 509         print_indent();
 510         print_char('}');
 511 }
 512
 513 /**
 514  * Prints an enum type.
 515  *
 516  * @param type  The enum type.
 517  */
 518 static void print_type_enum(const enum_type_t *type)
 519 {
 520         print_type_qualifiers(type->base.base.qualifiers, QUAL_SEP_END);
 521         print_string("enum ");
 522
 523         enum_t   *enume  = type->enume;
 524         symbol_t *symbol = enume->base.symbol;
 525         if (symbol != NULL) {
 526                 print_string(symbol->string);
 527         } else {
 528                 print_enum_definition(enume);
 529         }
 530 }
 531
 532 void print_compound_definition(const compound_t *compound)
 533 {
 534         print_string("{\n");
 535         change_indent(1);
 536
 537         entity_t *entity = compound->members.entities;
 538         for ( ; entity != NULL; entity = entity->base.next) {
 539                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 540                         continue;
 541
 542                 print_indent();
 543                 print_entity(entity);
 544                 print_char('\n');
 545         }
 546
 547         change_indent(-1);
 548         print_indent();
 549         print_char('}');
 550         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 551                 print_string("__attribute__((__transparent_union__))");
 552         }
 553 }
 554
 555 /**
 556  * Prints a compound type.
 557  *
 558  * @param kind  The name of the compound kind.
 559  * @param type  The compound type.
 560  */
 561 static void print_compound_type(char const *const kind, compound_type_t const *const type)
 562 {
 563         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 564         print_string(kind);
 565
 566         compound_t *compound = type->compound;
 567         symbol_t   *symbol   = compound->base.symbol;
 568         if (symbol != NULL) {
 569                 print_string(symbol->string);
 570         } else {
 571                 print_compound_definition(compound);
 572         }
 573 }
 574
 575 /**
 576  * Prints the prefix part of a typedef type.
 577  *
 578  * @param type   The typedef type.
 579  */
 580 static void print_typedef_type_pre(const typedef_type_t *const type)
 581 {
 582         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 583         print_string(type->typedefe->base.symbol->string);
 584 }
 585
 586 /**
 587  * Prints the prefix part of a typeof type.
 588  *
 589  * @param type   The typeof type.
 590  */
 591 static void print_typeof_type_pre(const typeof_type_t *const type)
 592 {
 593         print_string("typeof(");
 594         if (type->expression != NULL) {
 595                 print_expression(type->expression);
 596         } else {
 597                 print_type(type->typeof_type);
 598         }
 599         print_char(')');
 600 }
 601
 602 /**
 603  * Prints the prefix part of a type.
 604  *
 605  * @param type   The type.
 606  */
 607 static void intern_print_type_pre(const type_t *const type)
 608 {
 609         switch (type->kind) {
 610         case TYPE_ARRAY:           print_array_type_pre(          &type->array);     return;
 611         case TYPE_ATOMIC:          print_atomic_type(             &type->atomic);    return;
 612         case TYPE_COMPLEX:         print_complex_type(            &type->atomic);    return;
 613         case TYPE_COMPOUND_STRUCT: print_compound_type("struct ", &type->compound);  return;
 614         case TYPE_COMPOUND_UNION:  print_compound_type("union ",  &type->compound);  return;
 615         case TYPE_ENUM:            print_type_enum(               &type->enumt);     return;
 616         case TYPE_ERROR:           print_string("<error>");                          return;
 617         case TYPE_FUNCTION:        print_function_type_pre(       &type->function);  return;
 618         case TYPE_IMAGINARY:       print_imaginary_type(          &type->atomic);    return;
 619         case TYPE_POINTER:         print_pointer_type_pre(        &type->pointer);   return;
 620         case TYPE_REFERENCE:       print_reference_type_pre(      &type->reference); return;
 621         case TYPE_TYPEDEF:         print_typedef_type_pre(        &type->typedeft);  return;
 622         case TYPE_TYPEOF:          print_typeof_type_pre(         &type->typeoft);   return;
 623         }
 624         print_string("unknown");
 625 }
 626
 627 /**
 628  * Prints the postfix part of a type.
 629  *
 630  * @param type   The type.
 631  */
 632 static void intern_print_type_post(const type_t *const type)
 633 {
 634         switch (type->kind) {
 635         case TYPE_FUNCTION:
 636                 print_function_type_post(&type->function, NULL);
 637                 return;
 638         case TYPE_POINTER:
 639                 print_pointer_type_post(&type->pointer);
 640                 return;
 641         case TYPE_REFERENCE:
 642                 print_reference_type_post(&type->reference);
 643                 return;
 644         case TYPE_ARRAY:
 645                 print_array_type_post(&type->array);
 646                 return;
 647         case TYPE_ERROR:
 648         case TYPE_ATOMIC:
 649         case TYPE_COMPLEX:
 650         case TYPE_IMAGINARY:
 651         case TYPE_ENUM:
 652         case TYPE_COMPOUND_STRUCT:
 653         case TYPE_COMPOUND_UNION:
 654         case TYPE_TYPEOF:
 655         case TYPE_TYPEDEF:
 656                 break;
 657         }
 658 }
 659
 660 void print_type(const type_t *const type)
 661 {
 662         print_type_ext(type, NULL, NULL);
 663 }
 664
 665 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 666                     const scope_t *parameters)
 667 {
 668         intern_print_type_pre(type);
 669         if (symbol != NULL) {
 670                 print_char(' ');
 671                 print_string(symbol->string);
 672         }
 673         if (type->kind == TYPE_FUNCTION) {
 674                 print_function_type_post(&type->function, parameters);
 675         } else {
 676                 intern_print_type_post(type);
 677         }
 678 }
 679
 680 type_t *duplicate_type(const type_t *type)
 681 {
 682         size_t size = get_type_struct_size(type->kind);
 683
 684         type_t *const copy = obstack_copy(&type_obst, type, size);
 685         copy->base.firm_type = NULL;
 686
 687         return copy;
 688 }
 689
 690 type_t *get_unqualified_type(type_t *type)
 691 {
 692         assert(!is_typeref(type));
 693
 694         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 695                 return type;
 696
 697         type_t *unqualified_type          = duplicate_type(type);
 698         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 699
 700         return identify_new_type(unqualified_type);
 701 }
 702
 703 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 704 {
 705         type_t *type = skip_typeref(orig_type);
 706
 707         type_t *copy;
 708         if (is_type_array(type)) {
 709                 /* For array types the element type has to be adjusted */
 710                 type_t *element_type      = type->array.element_type;
 711                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 712
 713                 if (qual_element_type == element_type)
 714                         return orig_type;
 715
 716                 copy                     = duplicate_type(type);
 717                 copy->array.element_type = qual_element_type;
 718         } else if (is_type_valid(type)) {
 719                 if ((type->base.qualifiers & qual) == (int)qual)
 720                         return orig_type;
 721
 722                 copy                   = duplicate_type(type);
 723                 copy->base.qualifiers |= qual;
 724         } else {
 725                 return type;
 726         }
 727
 728         return identify_new_type(copy);
 729 }
 730
 731 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 732                                   atomic_type_flag_t flag)
 733 {
 734         assert(kind <= ATOMIC_TYPE_LAST);
 735         return (atomic_type_properties[kind].flags & flag) != 0;
 736 }
 737
 738 bool is_type_integer(const type_t *type)
 739 {
 740         assert(!is_typeref(type));
 741         if (!is_type_arithmetic(type))
 742                 return false;
 743         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 744 }
 745
 746 bool is_type_enum(const type_t *type)
 747 {
 748         assert(!is_typeref(type));
 749         return type->kind == TYPE_ENUM;
 750 }
 751
 752 bool is_type_float(const type_t *type)
 753 {
 754         assert(!is_typeref(type));
 755
 756         if (type->kind != TYPE_ATOMIC)
 757                 return false;
 758
 759         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 760 }
 761
 762 bool is_type_complex(const type_t *type)
 763 {
 764         assert(!is_typeref(type));
 765         return type->kind == TYPE_COMPLEX;
 766 }
 767
 768 bool is_type_signed(const type_t *type)
 769 {
 770         assert(!is_typeref(type));
 771         if (!is_type_arithmetic(type))
 772                 return false;
 773         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 774 }
 775
 776 bool is_type_arithmetic(const type_t *type)
 777 {
 778         assert(!is_typeref(type));
 779
 780         switch (type->kind) {
 781         case TYPE_ENUM:
 782                 return true;
 783         case TYPE_ATOMIC:
 784         case TYPE_COMPLEX:
 785         case TYPE_IMAGINARY:
 786                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 787         default:
 788                 return false;
 789         }
 790 }
 791
 792 bool is_type_real(const type_t *type)
 793 {
 794         /* 6.2.5 (17) */
 795         return is_type_integer(type) || is_type_float(type);
 796 }
 797
 798 bool is_type_scalar(const type_t *type)
 799 {
 800         assert(!is_typeref(type));
 801
 802         switch (type->kind) {
 803         case TYPE_POINTER:
 804         case TYPE_ENUM:
 805                 return true;
 806         case TYPE_ATOMIC:
 807         case TYPE_COMPLEX:
 808         case TYPE_IMAGINARY:
 809                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 810         default:
 811                 return false;
 812         }
 813 }
 814
 815 bool is_type_incomplete(const type_t *type)
 816 {
 817         assert(!is_typeref(type));
 818
 819         switch (type->kind) {
 820         case TYPE_COMPOUND_STRUCT:
 821         case TYPE_COMPOUND_UNION: {
 822                 const compound_type_t *compound_type = &type->compound;
 823                 return !compound_type->compound->complete;
 824         }
 825         case TYPE_ENUM:
 826                 return false;
 827
 828         case TYPE_ARRAY:
 829                 return type->array.size_expression == NULL
 830                         && !type->array.size_constant;
 831
 832         case TYPE_ATOMIC:
 833         case TYPE_IMAGINARY:
 834         case TYPE_COMPLEX:
 835                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 836
 837         case TYPE_FUNCTION:
 838         case TYPE_POINTER:
 839         case TYPE_REFERENCE:
 840         case TYPE_ERROR:
 841                 return false;
 842
 843         case TYPE_TYPEDEF:
 844         case TYPE_TYPEOF:
 845                 panic("typedef not skipped");
 846         }
 847
 848         panic("invalid type");
 849 }
 850
 851 bool is_type_object(const type_t *type)
 852 {
 853         return !is_type_function(type) && !is_type_incomplete(type);
 854 }
 855
 856 /**
 857  * Check if two function types are compatible.
 858  */
 859 static bool function_types_compatible(const function_type_t *func1,
 860                                       const function_type_t *func2)
 861 {
 862         const type_t* const ret1 = skip_typeref(func1->return_type);
 863         const type_t* const ret2 = skip_typeref(func2->return_type);
 864         if (!types_compatible(ret1, ret2))
 865                 return false;
 866
 867         if (func1->linkage != func2->linkage)
 868                 return false;
 869
 870         cc_kind_t cc1 = func1->calling_convention;
 871         if (cc1 == CC_DEFAULT)
 872                 cc1 = default_calling_convention;
 873         cc_kind_t cc2 = func2->calling_convention;
 874         if (cc2 == CC_DEFAULT)
 875                 cc2 = default_calling_convention;
 876
 877         if (cc1 != cc2)
 878                 return false;
 879
 880         if (func1->variadic != func2->variadic)
 881                 return false;
 882
 883         /* can parameters be compared? */
 884         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
 885                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
 886                 return true;
 887
 888         /* TODO: handling of unspecified parameters not correct yet */
 889
 890         /* all argument types must be compatible */
 891         function_parameter_t *parameter1 = func1->parameters;
 892         function_parameter_t *parameter2 = func2->parameters;
 893         for ( ; parameter1 != NULL && parameter2 != NULL;
 894                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 895                 type_t *parameter1_type = skip_typeref(parameter1->type);
 896                 type_t *parameter2_type = skip_typeref(parameter2->type);
 897
 898                 parameter1_type = get_unqualified_type(parameter1_type);
 899                 parameter2_type = get_unqualified_type(parameter2_type);
 900
 901                 if (!types_compatible(parameter1_type, parameter2_type))
 902                         return false;
 903         }
 904         /* same number of arguments? */
 905         if (parameter1 != NULL || parameter2 != NULL)
 906                 return false;
 907
 908         return true;
 909 }
 910
 911 /**
 912  * Check if two array types are compatible.
 913  */
 914 static bool array_types_compatible(const array_type_t *array1,
 915                                    const array_type_t *array2)
 916 {
 917         type_t *element_type1 = skip_typeref(array1->element_type);
 918         type_t *element_type2 = skip_typeref(array2->element_type);
 919         if (!types_compatible(element_type1, element_type2))
 920                 return false;
 921
 922         if (!array1->size_constant || !array2->size_constant)
 923                 return true;
 924
 925         return array1->size == array2->size;
 926 }
 927
 928 bool types_compatible(const type_t *type1, const type_t *type2)
 929 {
 930         assert(!is_typeref(type1));
 931         assert(!is_typeref(type2));
 932
 933         /* shortcut: the same type is always compatible */
 934         if (type1 == type2)
 935                 return true;
 936
 937         if (type1->base.qualifiers == type2->base.qualifiers &&
 938             type1->kind            == type2->kind) {
 939                 switch (type1->kind) {
 940                 case TYPE_FUNCTION:
 941                         return function_types_compatible(&type1->function, &type2->function);
 942                 case TYPE_ATOMIC:
 943                 case TYPE_IMAGINARY:
 944                 case TYPE_COMPLEX:
 945                         return type1->atomic.akind == type2->atomic.akind;
 946                 case TYPE_ARRAY:
 947                         return array_types_compatible(&type1->array, &type2->array);
 948
 949                 case TYPE_POINTER: {
 950                         const type_t *const to1 = skip_typeref(type1->pointer.points_to);
 951                         const type_t *const to2 = skip_typeref(type2->pointer.points_to);
 952                         return types_compatible(to1, to2);
 953                 }
 954
 955                 case TYPE_REFERENCE: {
 956                         const type_t *const to1 = skip_typeref(type1->reference.refers_to);
 957                         const type_t *const to2 = skip_typeref(type2->reference.refers_to);
 958                         return types_compatible(to1, to2);
 959                 }
 960
 961                 case TYPE_COMPOUND_STRUCT:
 962                 case TYPE_COMPOUND_UNION:
 963                         break;
 964
 965                 case TYPE_ENUM:
 966                         /* TODO: not implemented */
 967                         break;
 968
 969                 case TYPE_ERROR:
 970                         /* Hmm, the error type should be compatible to all other types */
 971                         return true;
 972                 case TYPE_TYPEDEF:
 973                 case TYPE_TYPEOF:
 974                         panic("typeref not skipped");
 975                 }
 976         }
 977
 978         return !is_type_valid(type1) || !is_type_valid(type2);
 979 }
 980
 981 /**
 982  * Skip all typerefs and return the underlying type.
 983  */
 984 type_t *skip_typeref(type_t *type)
 985 {
 986         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
 987
 988         while (true) {
 989                 switch (type->kind) {
 990                 case TYPE_ERROR:
 991                         return type;
 992                 case TYPE_TYPEDEF: {
 993                         qualifiers |= type->base.qualifiers;
 994
 995                         const typedef_type_t *typedef_type = &type->typedeft;
 996                         if (typedef_type->resolved_type != NULL) {
 997                                 type = typedef_type->resolved_type;
 998                                 break;
 999                         }
1000                         type = typedef_type->typedefe->type;
1001                         continue;
1002                 }
1003                 case TYPE_TYPEOF:
1004                         qualifiers |= type->base.qualifiers;
1005                         type        = type->typeoft.typeof_type;
1006                         continue;
1007                 default:
1008                         break;
1009                 }
1010                 break;
1011         }
1012
1013         if (qualifiers != TYPE_QUALIFIER_NONE) {
1014                 type_t *const copy = duplicate_type(type);
1015
1016                 /* for const with typedefed array type the element type has to be
1017                  * adjusted */
1018                 if (is_type_array(copy)) {
1019                         type_t *element_type           = copy->array.element_type;
1020                         element_type                   = duplicate_type(element_type);
1021                         element_type->base.qualifiers |= qualifiers;
1022                         copy->array.element_type       = element_type;
1023                 } else {
1024                         copy->base.qualifiers |= qualifiers;
1025                 }
1026
1027                 type = identify_new_type(copy);
1028         }
1029
1030         return type;
1031 }
1032
1033 unsigned get_type_size(type_t *type)
1034 {
1035         switch (type->kind) {
1036         case TYPE_ERROR:
1037                 return 0;
1038         case TYPE_ATOMIC:
1039         case TYPE_IMAGINARY:
1040         case TYPE_ENUM:
1041                 return get_atomic_type_size(type->atomic.akind);
1042         case TYPE_COMPLEX:
1043                 return get_atomic_type_size(type->atomic.akind) * 2;
1044         case TYPE_COMPOUND_UNION:
1045                 layout_union_type(&type->compound);
1046                 return type->compound.compound->size;
1047         case TYPE_COMPOUND_STRUCT:
1048                 layout_struct_type(&type->compound);
1049                 return type->compound.compound->size;
1050         case TYPE_FUNCTION:
1051                 return 1; /* strange GNU extensions: sizeof(function) == 1 */
1052         case TYPE_REFERENCE:
1053         case TYPE_POINTER:
1054                 return pointer_properties.size;
1055         case TYPE_ARRAY: {
1056                 /* TODO: correct if element_type is aligned? */
1057                 il_size_t element_size = get_type_size(type->array.element_type);
1058                 return type->array.size * element_size;
1059         }
1060         case TYPE_TYPEDEF:
1061                 return get_type_size(type->typedeft.typedefe->type);
1062         case TYPE_TYPEOF:
1063                 return get_type_size(type->typeoft.typeof_type);
1064         }
1065         panic("invalid type");
1066 }
1067
1068 unsigned get_type_alignment(type_t *type)
1069 {
1070         switch (type->kind) {
1071         case TYPE_ERROR:
1072                 return 0;
1073         case TYPE_ATOMIC:
1074         case TYPE_IMAGINARY:
1075         case TYPE_COMPLEX:
1076         case TYPE_ENUM:
1077                 return get_atomic_type_alignment(type->atomic.akind);
1078         case TYPE_COMPOUND_UNION:
1079                 layout_union_type(&type->compound);
1080                 return type->compound.compound->alignment;
1081         case TYPE_COMPOUND_STRUCT:
1082                 layout_struct_type(&type->compound);
1083                 return type->compound.compound->alignment;
1084         case TYPE_FUNCTION:
1085                 /* gcc says 1 here... */
1086                 return 1;
1087         case TYPE_REFERENCE:
1088         case TYPE_POINTER:
1089                 return pointer_properties.alignment;
1090         case TYPE_ARRAY:
1091                 return get_type_alignment(type->array.element_type);
1092         case TYPE_TYPEDEF: {
1093                 il_alignment_t alignment
1094                         = get_type_alignment(type->typedeft.typedefe->type);
1095                 if (type->typedeft.typedefe->alignment > alignment)
1096                         alignment = type->typedeft.typedefe->alignment;
1097
1098                 return alignment;
1099         }
1100         case TYPE_TYPEOF:
1101                 return get_type_alignment(type->typeoft.typeof_type);
1102         }
1103         panic("invalid type");
1104 }
1105
1106 /**
1107  * get alignment of a type when used inside a compound.
1108  * Some ABIs are broken and alignment inside a compound is different from
1109  * recommended alignment of a type
1110  */
1111 static unsigned get_type_alignment_compound(type_t *const type)
1112 {
1113         assert(!is_typeref(type));
1114         if (type->kind == TYPE_ATOMIC)
1115                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1116         return get_type_alignment(type);
1117 }
1118
1119 decl_modifiers_t get_type_modifiers(const type_t *type)
1120 {
1121         switch (type->kind) {
1122         case TYPE_ERROR:
1123                 break;
1124         case TYPE_COMPOUND_STRUCT:
1125         case TYPE_COMPOUND_UNION:
1126                 return type->compound.compound->modifiers;
1127         case TYPE_FUNCTION:
1128                 return type->function.modifiers;
1129         case TYPE_ENUM:
1130         case TYPE_ATOMIC:
1131         case TYPE_COMPLEX:
1132         case TYPE_IMAGINARY:
1133         case TYPE_REFERENCE:
1134         case TYPE_POINTER:
1135         case TYPE_ARRAY:
1136                 return 0;
1137         case TYPE_TYPEDEF: {
1138                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1139                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1140                 return modifiers;
1141         }
1142         case TYPE_TYPEOF:
1143                 return get_type_modifiers(type->typeoft.typeof_type);
1144         }
1145         panic("invalid type");
1146 }
1147
1148 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1149 {
1150         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1151
1152         while (true) {
1153                 switch (type->base.kind) {
1154                 case TYPE_ERROR:
1155                         return TYPE_QUALIFIER_NONE;
1156                 case TYPE_TYPEDEF:
1157                         qualifiers |= type->base.qualifiers;
1158                         const typedef_type_t *typedef_type = &type->typedeft;
1159                         if (typedef_type->resolved_type != NULL)
1160                                 type = typedef_type->resolved_type;
1161                         else
1162                                 type = typedef_type->typedefe->type;
1163                         continue;
1164                 case TYPE_TYPEOF:
1165                         type = type->typeoft.typeof_type;
1166                         continue;
1167                 case TYPE_ARRAY:
1168                         if (skip_array_type) {
1169                                 type = type->array.element_type;
1170                                 continue;
1171                         }
1172                         break;
1173                 default:
1174                         break;
1175                 }
1176                 break;
1177         }
1178         return type->base.qualifiers | qualifiers;
1179 }
1180
1181 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1182 {
1183         assert(kind <= ATOMIC_TYPE_LAST);
1184         return atomic_type_properties[kind].size;
1185 }
1186
1187 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1188 {
1189         assert(kind <= ATOMIC_TYPE_LAST);
1190         return atomic_type_properties[kind].alignment;
1191 }
1192
1193 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1194 {
1195         assert(kind <= ATOMIC_TYPE_LAST);
1196         return atomic_type_properties[kind].flags;
1197 }
1198
1199 /**
1200  * Find the atomic type kind representing a given size (signed).
1201  */
1202 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1203 {
1204         static atomic_type_kind_t kinds[32];
1205
1206         assert(size < 32);
1207         atomic_type_kind_t kind = kinds[size];
1208         if (kind == (atomic_type_kind_t)0) {
1209                 static const atomic_type_kind_t possible_kinds[] = {
1210                         ATOMIC_TYPE_SCHAR,
1211                         ATOMIC_TYPE_SHORT,
1212                         ATOMIC_TYPE_INT,
1213                         ATOMIC_TYPE_LONG,
1214                         ATOMIC_TYPE_LONGLONG
1215                 };
1216                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1217                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1218                                 kind = possible_kinds[i];
1219                                 break;
1220                         }
1221                 }
1222                 kinds[size] = kind;
1223         }
1224         return kind;
1225 }
1226
1227 /**
1228  * Find the atomic type kind representing a given size (signed).
1229  */
1230 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1231 {
1232         static atomic_type_kind_t kinds[32];
1233
1234         assert(size < 32);
1235         atomic_type_kind_t kind = kinds[size];
1236         if (kind == (atomic_type_kind_t)0) {
1237                 static const atomic_type_kind_t possible_kinds[] = {
1238                         ATOMIC_TYPE_UCHAR,
1239                         ATOMIC_TYPE_USHORT,
1240                         ATOMIC_TYPE_UINT,
1241                         ATOMIC_TYPE_ULONG,
1242                         ATOMIC_TYPE_ULONGLONG
1243                 };
1244                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1245                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1246                                 kind = possible_kinds[i];
1247                                 break;
1248                         }
1249                 }
1250                 kinds[size] = kind;
1251         }
1252         return kind;
1253 }
1254
1255 /**
1256  * Hash the given type and return the "singleton" version
1257  * of it.
1258  */
1259 type_t *identify_new_type(type_t *type)
1260 {
1261         type_t *result = typehash_insert(type);
1262         if (result != type) {
1263                 obstack_free(&type_obst, type);
1264         }
1265         return result;
1266 }
1267
1268 /**
1269  * Creates a new atomic type.
1270  *
1271  * @param akind       The kind of the atomic type.
1272  * @param qualifiers  Type qualifiers for the new type.
1273  */
1274 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1275 {
1276         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1277         type->base.qualifiers = qualifiers;
1278         type->atomic.akind    = akind;
1279
1280         return identify_new_type(type);
1281 }
1282
1283 /**
1284  * Creates a new complex type.
1285  *
1286  * @param akind       The kind of the atomic type.
1287  * @param qualifiers  Type qualifiers for the new type.
1288  */
1289 type_t *make_complex_type(atomic_type_kind_t akind,
1290                           type_qualifiers_t qualifiers)
1291 {
1292         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1293         type->base.qualifiers = qualifiers;
1294         type->atomic.akind   = akind;
1295
1296         return identify_new_type(type);
1297 }
1298
1299 /**
1300  * Creates a new imaginary type.
1301  *
1302  * @param akind       The kind of the atomic type.
1303  * @param qualifiers  Type qualifiers for the new type.
1304  */
1305 type_t *make_imaginary_type(atomic_type_kind_t akind,
1306                             type_qualifiers_t qualifiers)
1307 {
1308         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1309         type->base.qualifiers = qualifiers;
1310         type->atomic.akind = akind;
1311
1312         return identify_new_type(type);
1313 }
1314
1315 /**
1316  * Creates a new pointer type.
1317  *
1318  * @param points_to   The points-to type for the new type.
1319  * @param qualifiers  Type qualifiers for the new type.
1320  */
1321 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1322 {
1323         type_t *const type = allocate_type_zero(TYPE_POINTER);
1324         type->base.qualifiers       = qualifiers;
1325         type->pointer.points_to     = points_to;
1326         type->pointer.base_variable = NULL;
1327
1328         return identify_new_type(type);
1329 }
1330
1331 /**
1332  * Creates a new reference type.
1333  *
1334  * @param refers_to   The referred-to type for the new type.
1335  */
1336 type_t *make_reference_type(type_t *refers_to)
1337 {
1338         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1339         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1340         type->reference.refers_to = refers_to;
1341
1342         return identify_new_type(type);
1343 }
1344
1345 /**
1346  * Creates a new based pointer type.
1347  *
1348  * @param points_to   The points-to type for the new type.
1349  * @param qualifiers  Type qualifiers for the new type.
1350  * @param variable    The based variable
1351  */
1352 type_t *make_based_pointer_type(type_t *points_to,
1353                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1354 {
1355         type_t *const type = allocate_type_zero(TYPE_POINTER);
1356         type->base.qualifiers       = qualifiers;
1357         type->pointer.points_to     = points_to;
1358         type->pointer.base_variable = variable;
1359
1360         return identify_new_type(type);
1361 }
1362
1363
1364 type_t *make_array_type(type_t *element_type, size_t size,
1365                         type_qualifiers_t qualifiers)
1366 {
1367         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1368         type->base.qualifiers     = qualifiers;
1369         type->array.element_type  = element_type;
1370         type->array.size          = size;
1371         type->array.size_constant = true;
1372
1373         return identify_new_type(type);
1374 }
1375
1376 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1377                                        il_alignment_t *struct_alignment,
1378                                                                            bool packed, entity_t *first)
1379 {
1380         il_size_t      offset     = *struct_offset;
1381         il_alignment_t alignment  = *struct_alignment;
1382         size_t         bit_offset = 0;
1383
1384         entity_t *member;
1385         for (member = first; member != NULL; member = member->base.next) {
1386                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1387                         continue;
1388                 if (!member->compound_member.bitfield)
1389                         break;
1390
1391                 type_t *const base_type = skip_typeref(member->declaration.type);
1392                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1393                 il_alignment_t alignment_mask = base_alignment-1;
1394                 if (base_alignment > alignment)
1395                         alignment = base_alignment;
1396
1397                 size_t bit_size = member->compound_member.bit_size;
1398                 if (!packed) {
1399                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1400                         offset     &= ~alignment_mask;
1401                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1402
1403                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1404                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1405                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1406                                 bit_offset = 0;
1407                         }
1408                 }
1409
1410                 if (byte_order_big_endian) {
1411                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1412                         member->compound_member.offset     = offset & ~alignment_mask;
1413                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1414                 } else {
1415                         member->compound_member.offset     = offset;
1416                         member->compound_member.bit_offset = bit_offset;
1417                 }
1418
1419                 bit_offset += bit_size;
1420                 offset     += bit_offset / BITS_PER_BYTE;
1421                 bit_offset %= BITS_PER_BYTE;
1422         }
1423
1424         if (bit_offset > 0)
1425                 offset += 1;
1426
1427         *struct_offset    = offset;
1428         *struct_alignment = alignment;
1429         return member;
1430 }
1431
1432 void layout_struct_type(compound_type_t *type)
1433 {
1434         assert(type->compound != NULL);
1435
1436         compound_t *compound = type->compound;
1437         if (!compound->complete)
1438                 return;
1439         if (type->compound->layouted)
1440                 return;
1441         compound->layouted = true;
1442
1443         il_size_t      offset    = 0;
1444         il_alignment_t alignment = compound->alignment;
1445         bool           need_pad  = false;
1446
1447         entity_t *entry = compound->members.entities;
1448         while (entry != NULL) {
1449                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1450                         goto next;
1451
1452                 type_t *const m_type = skip_typeref(entry->declaration.type);
1453                 if (!is_type_valid(m_type))
1454                         goto next;
1455
1456                 if (entry->compound_member.bitfield) {
1457                         entry = pack_bitfield_members(&offset, &alignment,
1458                                                       compound->packed, entry);
1459                         continue;
1460                 }
1461
1462                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1463                 if (m_alignment > alignment)
1464                         alignment = m_alignment;
1465
1466                 if (!compound->packed) {
1467                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1468
1469                         if (new_offset > offset) {
1470                                 need_pad = true;
1471                                 offset   = new_offset;
1472                         }
1473                 }
1474
1475                 entry->compound_member.offset = offset;
1476                 offset += get_type_size(m_type);
1477
1478 next:
1479                 entry = entry->base.next;
1480         }
1481
1482         if (!compound->packed) {
1483                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1484                 if (new_offset > offset) {
1485                         need_pad = true;
1486                         offset   = new_offset;
1487                 }
1488         }
1489
1490         position_t const *const pos = &compound->base.pos;
1491         if (need_pad) {
1492                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1493         } else if (compound->packed) {
1494                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1495         }
1496
1497         compound->size      = offset;
1498         compound->alignment = alignment;
1499 }
1500
1501 void layout_union_type(compound_type_t *type)
1502 {
1503         assert(type->compound != NULL);
1504
1505         compound_t *compound = type->compound;
1506         if (! compound->complete)
1507                 return;
1508         if (compound->layouted)
1509                 return;
1510         compound->layouted = true;
1511
1512         il_size_t      size      = 0;
1513         il_alignment_t alignment = compound->alignment;
1514
1515         entity_t *entry = compound->members.entities;
1516         for (; entry != NULL; entry = entry->base.next) {
1517                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1518                         continue;
1519
1520                 type_t *m_type = skip_typeref(entry->declaration.type);
1521                 if (! is_type_valid(skip_typeref(m_type)))
1522                         continue;
1523
1524                 entry->compound_member.offset = 0;
1525                 il_size_t m_size = get_type_size(m_type);
1526                 if (m_size > size)
1527                         size = m_size;
1528                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1529                 if (m_alignment > alignment)
1530                         alignment = m_alignment;
1531         }
1532         size = (size + alignment - 1) & -alignment;
1533
1534         compound->size      = size;
1535         compound->alignment = alignment;
1536 }
1537
1538 function_parameter_t *allocate_parameter(type_t *const type)
1539 {
1540         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1541         memset(param, 0, sizeof(*param));
1542         param->type = type;
1543         return param;
1544 }
1545
1546 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1547                              type_t *argument_type2, decl_modifiers_t modifiers)
1548 {
1549         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1550         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1551         parameter1->next = parameter2;
1552
1553         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1554         type->function.return_type = return_type;
1555         type->function.parameters  = parameter1;
1556         type->function.modifiers  |= modifiers;
1557         type->function.linkage     = LINKAGE_C;
1558
1559         return identify_new_type(type);
1560 }
1561
1562 type_t *make_function_1_type(type_t *return_type, type_t *argument_type,
1563                              decl_modifiers_t modifiers)
1564 {
1565         function_parameter_t *const parameter = allocate_parameter(argument_type);
1566
1567         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1568         type->function.return_type = return_type;
1569         type->function.parameters  = parameter;
1570         type->function.modifiers  |= modifiers;
1571         type->function.linkage     = LINKAGE_C;
1572
1573         return identify_new_type(type);
1574 }
1575
1576 type_t *make_function_1_type_variadic(type_t *return_type,
1577                                       type_t *argument_type,
1578                                       decl_modifiers_t modifiers)
1579 {
1580         function_parameter_t *const parameter = allocate_parameter(argument_type);
1581
1582         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1583         type->function.return_type = return_type;
1584         type->function.parameters  = parameter;
1585         type->function.variadic    = true;
1586         type->function.modifiers  |= modifiers;
1587         type->function.linkage     = LINKAGE_C;
1588
1589         return identify_new_type(type);
1590 }
1591
1592 type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers)
1593 {
1594         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1595         type->function.return_type = return_type;
1596         type->function.parameters  = NULL;
1597         type->function.modifiers  |= modifiers;
1598         type->function.linkage     = LINKAGE_C;
1599
1600         return identify_new_type(type);
1601 }
1602
1603 type_t *make_function_type(type_t *return_type, int n_types,
1604                            type_t *const *argument_types,
1605                                                    decl_modifiers_t modifiers)
1606 {
1607         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1608         type->function.return_type = return_type;
1609         type->function.modifiers  |= modifiers;
1610         type->function.linkage     = LINKAGE_C;
1611
1612         function_parameter_t **anchor = &type->function.parameters;
1613         for (int i = 0; i < n_types; ++i) {
1614                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1615                 *anchor = parameter;
1616                 anchor  = &parameter->next;
1617         }
1618
1619         return identify_new_type(type);
1620 }
1621
1622 /**
1623  * Debug helper. Prints the given type to stdout.
1624  */
1625 static __attribute__((unused))
1626 void dbg_type(const type_t *type)
1627 {
1628         print_to_file(stderr);
1629         print_type(type);
1630         print_char('\n');
1631         fflush(stderr);
1632 }