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