nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "entity_t.h"
  27 #include "symbol_t.h"
  28 #include "type_hash.h"
  29 #include "adt/error.h"
  30 #include "adt/util.h"
  31 #include "lang_features.h"
  32
  33 static struct obstack   _type_obst;
  34 static FILE            *out;
  35 struct obstack         *type_obst                 = &_type_obst;
  36 static int              type_visited              = 0;
  37 static bool             print_implicit_array_size = false;
  38
  39 static void intern_print_type_pre(const type_t *type);
  40 static void intern_print_type_post(const type_t *type);
  41
  42 typedef struct atomic_type_properties_t atomic_type_properties_t;
  43 struct atomic_type_properties_t {
  44         unsigned   size;              /**< type size in bytes */
  45         unsigned   alignment;         /**< type alignment in bytes */
  46         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  47 };
  48
  49 /**
  50  * Properties of atomic types.
  51  */
  52 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  53         //ATOMIC_TYPE_INVALID = 0,
  54         [ATOMIC_TYPE_VOID] = {
  55                 .size       = 0,
  56                 .alignment  = 0,
  57                 .flags      = ATOMIC_TYPE_FLAG_NONE
  58         },
  59         [ATOMIC_TYPE_WCHAR_T] = {
  60                 .size       = (unsigned)-1,
  61                 .alignment  = (unsigned)-1,
  62                 /* signed flag will be set when known */
  63                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  64         },
  65         [ATOMIC_TYPE_CHAR] = {
  66                 .size       = 1,
  67                 .alignment  = 1,
  68                 /* signed flag will be set when known */
  69                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  70         },
  71         [ATOMIC_TYPE_SCHAR] = {
  72                 .size       = 1,
  73                 .alignment  = 1,
  74                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  75                               | ATOMIC_TYPE_FLAG_SIGNED,
  76         },
  77         [ATOMIC_TYPE_UCHAR] = {
  78                 .size       = 1,
  79                 .alignment  = 1,
  80                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  81         },
  82         [ATOMIC_TYPE_SHORT] = {
  83                 .size       = 2,
  84                 .alignment  = 2,
  85                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  86                               | ATOMIC_TYPE_FLAG_SIGNED
  87         },
  88         [ATOMIC_TYPE_USHORT] = {
  89                 .size       = 2,
  90                 .alignment  = 2,
  91                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  92         },
  93         [ATOMIC_TYPE_INT] = {
  94                 .size       = (unsigned) -1,
  95                 .alignment  = (unsigned) -1,
  96                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  97                               | ATOMIC_TYPE_FLAG_SIGNED,
  98         },
  99         [ATOMIC_TYPE_UINT] = {
 100                 .size       = (unsigned) -1,
 101                 .alignment  = (unsigned) -1,
 102                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 103         },
 104         [ATOMIC_TYPE_LONG] = {
 105                 .size       = (unsigned) -1,
 106                 .alignment  = (unsigned) -1,
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 108                               | ATOMIC_TYPE_FLAG_SIGNED,
 109         },
 110         [ATOMIC_TYPE_ULONG] = {
 111                 .size       = (unsigned) -1,
 112                 .alignment  = (unsigned) -1,
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_LONGLONG] = {
 116                 .size       = (unsigned) -1,
 117                 .alignment  = (unsigned) -1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 119                               | ATOMIC_TYPE_FLAG_SIGNED,
 120         },
 121         [ATOMIC_TYPE_ULONGLONG] = {
 122                 .size       = (unsigned) -1,
 123                 .alignment  = (unsigned) -1,
 124                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 125         },
 126         [ATOMIC_TYPE_BOOL] = {
 127                 .size       = (unsigned) -1,
 128                 .alignment  = (unsigned) -1,
 129                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 130         },
 131         [ATOMIC_TYPE_FLOAT] = {
 132                 .size       = 4,
 133                 .alignment  = (unsigned) -1,
 134                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 135                               | ATOMIC_TYPE_FLAG_SIGNED,
 136         },
 137         [ATOMIC_TYPE_DOUBLE] = {
 138                 .size       = 8,
 139                 .alignment  = (unsigned) -1,
 140                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 141                               | ATOMIC_TYPE_FLAG_SIGNED,
 142         },
 143         [ATOMIC_TYPE_LONG_DOUBLE] = {
 144                 .size       = 12,
 145                 .alignment  = (unsigned) -1,
 146                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 147                               | ATOMIC_TYPE_FLAG_SIGNED,
 148         },
 149         /* complex and imaginary types are set in init_types */
 150 };
 151
 152 void init_types(void)
 153 {
 154         obstack_init(type_obst);
 155
 156         atomic_type_properties_t *props = atomic_type_properties;
 157
 158         if (char_is_signed) {
 159                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 160         }
 161
 162         unsigned int_size   = machine_size < 32 ? 2 : 4;
 163         unsigned long_size  = machine_size < 64 ? 4 : 8;
 164         unsigned llong_size = machine_size < 32 ? 4 : 8;
 165
 166         props[ATOMIC_TYPE_INT].size            = int_size;
 167         props[ATOMIC_TYPE_INT].alignment       = int_size;
 168         props[ATOMIC_TYPE_UINT].size           = int_size;
 169         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 170         props[ATOMIC_TYPE_LONG].size           = long_size;
 171         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 172         props[ATOMIC_TYPE_ULONG].size          = long_size;
 173         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 174         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 175         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 176         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 177         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 178
 179         /* TODO: backend specific, need a way to query the backend for this.
 180          * The following are good settings for x86 */
 181         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 182         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 183         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 184         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 185         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 186
 187         /* TODO: make this configurable for platforms which do not use byte sized
 188          * bools. */
 189         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 190
 191         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 192 }
 193
 194 void exit_types(void)
 195 {
 196         obstack_free(type_obst, NULL);
 197 }
 198
 199 void type_set_output(FILE *stream)
 200 {
 201         out = stream;
 202 }
 203
 204 void inc_type_visited(void)
 205 {
 206         type_visited++;
 207 }
 208
 209 void print_type_qualifiers(type_qualifiers_t qualifiers)
 210 {
 211         int first = 1;
 212         if (qualifiers & TYPE_QUALIFIER_CONST) {
 213                 fputs(" const" + first,    out);
 214                 first = 0;
 215         }
 216         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 217                 fputs(" volatile" + first, out);
 218                 first = 0;
 219         }
 220         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 221                 fputs(" restrict" + first, out);
 222                 first = 0;
 223         }
 224 }
 225
 226 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 227 {
 228         switch(kind) {
 229         case ATOMIC_TYPE_INVALID: break;
 230         case ATOMIC_TYPE_VOID:        return "void";
 231         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 232         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 233         case ATOMIC_TYPE_CHAR:        return "char";
 234         case ATOMIC_TYPE_SCHAR:       return "signed char";
 235         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 236         case ATOMIC_TYPE_INT:         return "int";
 237         case ATOMIC_TYPE_UINT:        return "unsigned int";
 238         case ATOMIC_TYPE_SHORT:       return "short";
 239         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 240         case ATOMIC_TYPE_LONG:        return "long";
 241         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 242         case ATOMIC_TYPE_LONGLONG:    return "long long";
 243         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 244         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 245         case ATOMIC_TYPE_FLOAT:       return "float";
 246         case ATOMIC_TYPE_DOUBLE:      return "double";
 247         }
 248         return "INVALIDATOMIC";
 249 }
 250
 251 /**
 252  * Prints the name of an atomic type kinds.
 253  *
 254  * @param kind  The type kind.
 255  */
 256 static void print_atomic_kinds(atomic_type_kind_t kind)
 257 {
 258         const char *s = get_atomic_kind_name(kind);
 259         fputs(s, out);
 260 }
 261
 262 /**
 263  * Prints the name of an atomic type.
 264  *
 265  * @param type  The type.
 266  */
 267 static void print_atomic_type(const atomic_type_t *type)
 268 {
 269         print_type_qualifiers(type->base.qualifiers);
 270         if (type->base.qualifiers != 0)
 271                 fputc(' ', out);
 272         print_atomic_kinds(type->akind);
 273 }
 274
 275 /**
 276  * Prints the name of a complex type.
 277  *
 278  * @param type  The type.
 279  */
 280 static
 281 void print_complex_type(const complex_type_t *type)
 282 {
 283         int empty = type->base.qualifiers == 0;
 284         print_type_qualifiers(type->base.qualifiers);
 285         fputs(" _Complex " + empty, out);
 286         print_atomic_kinds(type->akind);
 287 }
 288
 289 /**
 290  * Prints the name of an imaginary type.
 291  *
 292  * @param type  The type.
 293  */
 294 static
 295 void print_imaginary_type(const imaginary_type_t *type)
 296 {
 297         int empty = type->base.qualifiers == 0;
 298         print_type_qualifiers(type->base.qualifiers);
 299         fputs(" _Imaginary " + empty, out);
 300         print_atomic_kinds(type->akind);
 301 }
 302
 303 /**
 304  * Print the first part (the prefix) of a type.
 305  *
 306  * @param type   The type to print.
 307  */
 308 static void print_function_type_pre(const function_type_t *type)
 309 {
 310         switch (type->linkage) {
 311                 case LINKAGE_INVALID:
 312                         break;
 313
 314                 case LINKAGE_C:
 315                         if (c_mode & _CXX)
 316                                 fputs("extern \"C\" ",   out);
 317                         break;
 318
 319                 case LINKAGE_CXX:
 320                         if (!(c_mode & _CXX))
 321                                 fputs("extern \"C++\" ", out);
 322                         break;
 323         }
 324
 325         print_type_qualifiers(type->base.qualifiers);
 326         if (type->base.qualifiers != 0)
 327                 fputc(' ', out);
 328
 329         intern_print_type_pre(type->return_type);
 330
 331         switch (type->calling_convention) {
 332         case CC_CDECL:    fputs("__cdecl ",    out); break;
 333         case CC_STDCALL:  fputs("__stdcall ",  out); break;
 334         case CC_FASTCALL: fputs("__fastcall ", out); break;
 335         case CC_THISCALL: fputs("__thiscall ", out); break;
 336         case CC_DEFAULT:  break;
 337         }
 338 }
 339
 340 /**
 341  * Print the second part (the postfix) of a type.
 342  *
 343  * @param type   The type to print.
 344  */
 345 static void print_function_type_post(const function_type_t *type,
 346                                      const scope_t *parameters)
 347 {
 348         fputc('(', out);
 349         bool first = true;
 350         if (parameters == NULL) {
 351                 function_parameter_t *parameter = type->parameters;
 352                 for( ; parameter != NULL; parameter = parameter->next) {
 353                         if (first) {
 354                                 first = false;
 355                         } else {
 356                                 fputs(", ", out);
 357                         }
 358                         print_type(parameter->type);
 359                 }
 360         } else {
 361                 entity_t *parameter = parameters->entities;
 362                 for (; parameter != NULL; parameter = parameter->base.next) {
 363                         if (parameter->kind != ENTITY_PARAMETER)
 364                                 continue;
 365
 366                         if (first) {
 367                                 first = false;
 368                         } else {
 369                                 fputs(", ", out);
 370                         }
 371                         const type_t *const type = parameter->declaration.type;
 372                         if (type == NULL) {
 373                                 fputs(parameter->base.symbol->string, out);
 374                         } else {
 375                                 print_type_ext(type, parameter->base.symbol, NULL);
 376                         }
 377                 }
 378         }
 379         if (type->variadic) {
 380                 if (first) {
 381                         first = false;
 382                 } else {
 383                         fputs(", ", out);
 384                 }
 385                 fputs("...", out);
 386         }
 387         if (first && !type->unspecified_parameters) {
 388                 fputs("void", out);
 389         }
 390         fputc(')', out);
 391
 392         intern_print_type_post(type->return_type);
 393 }
 394
 395 /**
 396  * Prints the prefix part of a pointer type.
 397  *
 398  * @param type   The pointer type.
 399  */
 400 static void print_pointer_type_pre(const pointer_type_t *type)
 401 {
 402         type_t const *const points_to = type->points_to;
 403         intern_print_type_pre(points_to);
 404         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 405                 fputs(" (", out);
 406         variable_t *const variable = type->base_variable;
 407         if (variable != NULL) {
 408                 fputs(" __based(", out);
 409                 fputs(variable->base.base.symbol->string, out);
 410                 fputs(") ", out);
 411         }
 412         fputc('*', out);
 413         type_qualifiers_t const qual = type->base.qualifiers;
 414         if (qual != 0)
 415                 fputc(' ', out);
 416         print_type_qualifiers(qual);
 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                 fputc(')', out);
 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                 fputs(" (", out);
 443         fputc('&', out);
 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                 fputc(')', out);
 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         fputc('[', out);
 477         if (type->is_static) {
 478                 fputs("static ", out);
 479         }
 480         print_type_qualifiers(type->base.qualifiers);
 481         if (type->base.qualifiers != 0)
 482                 fputc(' ', out);
 483         if (type->size_expression != NULL
 484                         && (print_implicit_array_size || !type->has_implicit_size)) {
 485                 print_expression(type->size_expression);
 486         }
 487         fputc(']', out);
 488         intern_print_type_post(type->element_type);
 489 }
 490
 491 /**
 492  * Prints the postfix part of a bitfield type.
 493  *
 494  * @param type   The array type.
 495  */
 496 static void print_bitfield_type_post(const bitfield_type_t *type)
 497 {
 498         fputs(" : ", out);
 499         print_expression(type->size_expression);
 500         intern_print_type_post(type->base_type);
 501 }
 502
 503 /**
 504  * Prints an enum definition.
 505  *
 506  * @param declaration  The enum's type declaration.
 507  */
 508 void print_enum_definition(const enum_t *enume)
 509 {
 510         fputs("{\n", out);
 511
 512         change_indent(1);
 513
 514         entity_t *entry = enume->base.next;
 515         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 516                entry = entry->base.next) {
 517
 518                 print_indent();
 519                 fputs(entry->base.symbol->string, out);
 520                 if (entry->enum_value.value != NULL) {
 521                         fputs(" = ", out);
 522
 523                         /* skip the implicit cast */
 524                         expression_t *expression = entry->enum_value.value;
 525                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 526                                 expression = expression->unary.value;
 527                         }
 528                         print_expression(expression);
 529                 }
 530                 fputs(",\n", out);
 531         }
 532
 533         change_indent(-1);
 534         print_indent();
 535         fputc('}', out);
 536 }
 537
 538 /**
 539  * Prints an enum type.
 540  *
 541  * @param type  The enum type.
 542  */
 543 static void print_type_enum(const enum_type_t *type)
 544 {
 545         int empty = type->base.qualifiers == 0;
 546         print_type_qualifiers(type->base.qualifiers);
 547         fputs(" enum " + empty, out);
 548
 549         enum_t   *enume  = type->enume;
 550         symbol_t *symbol = enume->base.symbol;
 551         if (symbol != NULL) {
 552                 fputs(symbol->string, out);
 553         } else {
 554                 print_enum_definition(enume);
 555         }
 556 }
 557
 558 /**
 559  * Print the compound part of a compound type.
 560  */
 561 void print_compound_definition(const compound_t *compound)
 562 {
 563         fputs("{\n", out);
 564         change_indent(1);
 565
 566         entity_t *entity = compound->members.entities;
 567         for( ; entity != NULL; entity = entity->base.next) {
 568                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 569                         continue;
 570
 571                 print_indent();
 572                 print_entity(entity);
 573                 fputc('\n', out);
 574         }
 575
 576         change_indent(-1);
 577         print_indent();
 578         fputc('}', out);
 579         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 580                 fputs("__attribute__((__transparent_union__))", out);
 581         }
 582 }
 583
 584 /**
 585  * Prints a compound type.
 586  *
 587  * @param type  The compound type.
 588  */
 589 static void print_compound_type(const compound_type_t *type)
 590 {
 591         int empty = type->base.qualifiers == 0;
 592         print_type_qualifiers(type->base.qualifiers);
 593
 594         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 595                 fputs(" struct " + empty, out);
 596         } else {
 597                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 598                 fputs(" union " + empty, out);
 599         }
 600
 601         compound_t *compound = type->compound;
 602         symbol_t   *symbol   = compound->base.symbol;
 603         if (symbol != NULL) {
 604                 fputs(symbol->string, out);
 605         } else {
 606                 print_compound_definition(compound);
 607         }
 608 }
 609
 610 /**
 611  * Prints the prefix part of a typedef type.
 612  *
 613  * @param type   The typedef type.
 614  */
 615 static void print_typedef_type_pre(const typedef_type_t *const type)
 616 {
 617         print_type_qualifiers(type->base.qualifiers);
 618         if (type->base.qualifiers != 0)
 619                 fputc(' ', out);
 620         fputs(type->typedefe->base.symbol->string, out);
 621 }
 622
 623 /**
 624  * Prints the prefix part of a typeof type.
 625  *
 626  * @param type   The typeof type.
 627  */
 628 static void print_typeof_type_pre(const typeof_type_t *const type)
 629 {
 630         fputs("typeof(", out);
 631         if (type->expression != NULL) {
 632                 print_expression(type->expression);
 633         } else {
 634                 print_type(type->typeof_type);
 635         }
 636         fputc(')', out);
 637 }
 638
 639 /**
 640  * Prints the prefix part of a type.
 641  *
 642  * @param type   The type.
 643  */
 644 static void intern_print_type_pre(const type_t *const type)
 645 {
 646         switch(type->kind) {
 647         case TYPE_ERROR:
 648                 fputs("<error>", out);
 649                 return;
 650         case TYPE_INVALID:
 651                 fputs("<invalid>", out);
 652                 return;
 653         case TYPE_ENUM:
 654                 print_type_enum(&type->enumt);
 655                 return;
 656         case TYPE_ATOMIC:
 657                 print_atomic_type(&type->atomic);
 658                 return;
 659         case TYPE_COMPLEX:
 660                 print_complex_type(&type->complex);
 661                 return;
 662         case TYPE_IMAGINARY:
 663                 print_imaginary_type(&type->imaginary);
 664                 return;
 665         case TYPE_COMPOUND_STRUCT:
 666         case TYPE_COMPOUND_UNION:
 667                 print_compound_type(&type->compound);
 668                 return;
 669         case TYPE_BUILTIN:
 670                 fputs(type->builtin.symbol->string, out);
 671                 return;
 672         case TYPE_FUNCTION:
 673                 print_function_type_pre(&type->function);
 674                 return;
 675         case TYPE_POINTER:
 676                 print_pointer_type_pre(&type->pointer);
 677                 return;
 678         case TYPE_REFERENCE:
 679                 print_reference_type_pre(&type->reference);
 680                 return;
 681         case TYPE_BITFIELD:
 682                 intern_print_type_pre(type->bitfield.base_type);
 683                 return;
 684         case TYPE_ARRAY:
 685                 print_array_type_pre(&type->array);
 686                 return;
 687         case TYPE_TYPEDEF:
 688                 print_typedef_type_pre(&type->typedeft);
 689                 return;
 690         case TYPE_TYPEOF:
 691                 print_typeof_type_pre(&type->typeoft);
 692                 return;
 693         }
 694         fputs("unknown", out);
 695 }
 696
 697 /**
 698  * Prints the postfix part of a type.
 699  *
 700  * @param type   The type.
 701  */
 702 static void intern_print_type_post(const type_t *const type)
 703 {
 704         switch(type->kind) {
 705         case TYPE_FUNCTION:
 706                 print_function_type_post(&type->function, NULL);
 707                 return;
 708         case TYPE_POINTER:
 709                 print_pointer_type_post(&type->pointer);
 710                 return;
 711         case TYPE_REFERENCE:
 712                 print_reference_type_post(&type->reference);
 713                 return;
 714         case TYPE_ARRAY:
 715                 print_array_type_post(&type->array);
 716                 return;
 717         case TYPE_BITFIELD:
 718                 print_bitfield_type_post(&type->bitfield);
 719                 return;
 720         case TYPE_ERROR:
 721         case TYPE_INVALID:
 722         case TYPE_ATOMIC:
 723         case TYPE_COMPLEX:
 724         case TYPE_IMAGINARY:
 725         case TYPE_ENUM:
 726         case TYPE_COMPOUND_STRUCT:
 727         case TYPE_COMPOUND_UNION:
 728         case TYPE_BUILTIN:
 729         case TYPE_TYPEOF:
 730         case TYPE_TYPEDEF:
 731                 break;
 732         }
 733
 734         if (type->base.modifiers & DM_TRANSPARENT_UNION) {
 735                 fputs("__attribute__((__transparent_union__))", out);
 736         }
 737 }
 738
 739 /**
 740  * Prints a type.
 741  *
 742  * @param type   The type.
 743  */
 744 void print_type(const type_t *const type)
 745 {
 746         print_type_ext(type, NULL, NULL);
 747 }
 748
 749 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 750                     const scope_t *parameters)
 751 {
 752         if (type == NULL) {
 753                 fputs("nil type", out);
 754                 return;
 755         }
 756
 757         intern_print_type_pre(type);
 758         if (symbol != NULL) {
 759                 fputc(' ', out);
 760                 fputs(symbol->string, out);
 761         }
 762         if (type->kind == TYPE_FUNCTION) {
 763                 print_function_type_post(&type->function, parameters);
 764         } else {
 765                 intern_print_type_post(type);
 766         }
 767 }
 768
 769 /**
 770  * Return the size of a type AST node.
 771  *
 772  * @param type  The type.
 773  */
 774 static size_t get_type_size(const type_t *type)
 775 {
 776         switch(type->kind) {
 777         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 778         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 779         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 780         case TYPE_COMPOUND_STRUCT:
 781         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 782         case TYPE_ENUM:            return sizeof(enum_type_t);
 783         case TYPE_FUNCTION:        return sizeof(function_type_t);
 784         case TYPE_POINTER:         return sizeof(pointer_type_t);
 785         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 786         case TYPE_ARRAY:           return sizeof(array_type_t);
 787         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 788         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 789         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 790         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 791         case TYPE_ERROR:           panic("error type found");
 792         case TYPE_INVALID:         panic("invalid type found");
 793         }
 794         panic("unknown type found");
 795 }
 796
 797 /**
 798  * Duplicates a type.
 799  *
 800  * @param type  The type to copy.
 801  * @return A copy of the type.
 802  *
 803  * @note This does not produce a deep copy!
 804  */
 805 type_t *duplicate_type(const type_t *type)
 806 {
 807         size_t size = get_type_size(type);
 808
 809         type_t *copy = obstack_alloc(type_obst, size);
 810         memcpy(copy, type, size);
 811         copy->base.firm_type = NULL;
 812
 813         return copy;
 814 }
 815
 816 /**
 817  * Returns the unqualified type of a given type.
 818  *
 819  * @param type  The type.
 820  * @returns The unqualified type.
 821  */
 822 type_t *get_unqualified_type(type_t *type)
 823 {
 824         assert(!is_typeref(type));
 825
 826         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 827                 return type;
 828
 829         type_t *unqualified_type          = duplicate_type(type);
 830         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 831
 832         return identify_new_type(unqualified_type);
 833 }
 834
 835 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 836 {
 837         type_t *type = skip_typeref(orig_type);
 838
 839         type_t *copy;
 840         if (is_type_array(type)) {
 841                 /* For array types the element type has to be adjusted */
 842                 type_t *element_type      = type->array.element_type;
 843                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 844
 845                 if (qual_element_type == element_type)
 846                         return orig_type;
 847
 848                 copy                     = duplicate_type(type);
 849                 copy->array.element_type = qual_element_type;
 850         } else if (is_type_valid(type)) {
 851                 if ((type->base.qualifiers & qual) == qual)
 852                         return orig_type;
 853
 854                 copy                   = duplicate_type(type);
 855                 copy->base.qualifiers |= qual;
 856         } else {
 857                 return type;
 858         }
 859
 860         return identify_new_type(copy);
 861 }
 862
 863 /**
 864  * Check if a type is valid.
 865  *
 866  * @param type  The type to check.
 867  * @return true if type represents a valid type.
 868  */
 869 bool type_valid(const type_t *type)
 870 {
 871         return type->kind != TYPE_INVALID;
 872 }
 873
 874 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 875                                   atomic_type_flag_t flag)
 876 {
 877         assert(kind <= ATOMIC_TYPE_LAST);
 878         return (atomic_type_properties[kind].flags & flag) != 0;
 879 }
 880
 881 /**
 882  * Returns true if the given type is an integer type.
 883  *
 884  * @param type  The type to check.
 885  * @return True if type is an integer type.
 886  */
 887 bool is_type_integer(const type_t *type)
 888 {
 889         assert(!is_typeref(type));
 890
 891         if (type->kind == TYPE_ENUM)
 892                 return true;
 893         if (type->kind == TYPE_BITFIELD)
 894                 return true;
 895
 896         if (type->kind != TYPE_ATOMIC)
 897                 return false;
 898
 899         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 900 }
 901
 902 /**
 903  * Returns true if the given type is an enum type.
 904  *
 905  * @param type  The type to check.
 906  * @return True if type is an enum type.
 907  */
 908 bool is_type_enum(const type_t *type)
 909 {
 910         assert(!is_typeref(type));
 911         return type->kind == TYPE_ENUM;
 912 }
 913
 914 /**
 915  * Returns true if the given type is an floating point type.
 916  *
 917  * @param type  The type to check.
 918  * @return True if type is a floating point type.
 919  */
 920 bool is_type_float(const type_t *type)
 921 {
 922         assert(!is_typeref(type));
 923
 924         if (type->kind != TYPE_ATOMIC)
 925                 return false;
 926
 927         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 928 }
 929
 930 /**
 931  * Returns true if the given type is an complex type.
 932  *
 933  * @param type  The type to check.
 934  * @return True if type is a complex type.
 935  */
 936 bool is_type_complex(const type_t *type)
 937 {
 938         assert(!is_typeref(type));
 939
 940         if (type->kind != TYPE_ATOMIC)
 941                 return false;
 942
 943         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 944 }
 945
 946 /**
 947  * Returns true if the given type is a signed type.
 948  *
 949  * @param type  The type to check.
 950  * @return True if type is a signed type.
 951  */
 952 bool is_type_signed(const type_t *type)
 953 {
 954         assert(!is_typeref(type));
 955
 956         /* enum types are int for now */
 957         if (type->kind == TYPE_ENUM)
 958                 return true;
 959         if (type->kind == TYPE_BITFIELD)
 960                 return is_type_signed(type->bitfield.base_type);
 961
 962         if (type->kind != TYPE_ATOMIC)
 963                 return false;
 964
 965         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 966 }
 967
 968 /**
 969  * Returns true if the given type represents an arithmetic type.
 970  *
 971  * @param type  The type to check.
 972  * @return True if type represents an arithmetic type.
 973  */
 974 bool is_type_arithmetic(const type_t *type)
 975 {
 976         assert(!is_typeref(type));
 977
 978         switch(type->kind) {
 979         case TYPE_BITFIELD:
 980         case TYPE_ENUM:
 981                 return true;
 982         case TYPE_ATOMIC:
 983                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 984         case TYPE_COMPLEX:
 985                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 986         case TYPE_IMAGINARY:
 987                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 988         default:
 989                 return false;
 990         }
 991 }
 992
 993 /**
 994  * Returns true if the given type is an integer or float type.
 995  *
 996  * @param type  The type to check.
 997  * @return True if type is an integer or float type.
 998  */
 999 bool is_type_real(const type_t *type)
1000 {
1001         /* 6.2.5 (17) */
1002         return is_type_integer(type) || is_type_float(type);
1003 }
1004
1005 /**
1006  * Returns true if the given type represents a scalar type.
1007  *
1008  * @param type  The type to check.
1009  * @return True if type represents a scalar type.
1010  */
1011 bool is_type_scalar(const type_t *type)
1012 {
1013         assert(!is_typeref(type));
1014
1015         switch (type->kind) {
1016                 case TYPE_POINTER: return true;
1017                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1018                 default:           break;
1019         }
1020
1021         return is_type_arithmetic(type);
1022 }
1023
1024 /**
1025  * Check if a given type is incomplete.
1026  *
1027  * @param type  The type to check.
1028  * @return True if the given type is incomplete (ie. just forward).
1029  */
1030 bool is_type_incomplete(const type_t *type)
1031 {
1032         assert(!is_typeref(type));
1033
1034         switch(type->kind) {
1035         case TYPE_COMPOUND_STRUCT:
1036         case TYPE_COMPOUND_UNION: {
1037                 const compound_type_t *compound_type = &type->compound;
1038                 return !compound_type->compound->complete;
1039         }
1040         case TYPE_ENUM:
1041                 return false;
1042
1043         case TYPE_ARRAY:
1044                 return type->array.size_expression == NULL
1045                         && !type->array.size_constant;
1046
1047         case TYPE_ATOMIC:
1048                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1049
1050         case TYPE_COMPLEX:
1051                 return type->complex.akind == ATOMIC_TYPE_VOID;
1052
1053         case TYPE_IMAGINARY:
1054                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1055
1056         case TYPE_BITFIELD:
1057         case TYPE_FUNCTION:
1058         case TYPE_POINTER:
1059         case TYPE_REFERENCE:
1060         case TYPE_BUILTIN:
1061         case TYPE_ERROR:
1062                 return false;
1063
1064         case TYPE_TYPEDEF:
1065         case TYPE_TYPEOF:
1066                 panic("is_type_incomplete called without typerefs skipped");
1067         case TYPE_INVALID:
1068                 break;
1069         }
1070
1071         panic("invalid type found");
1072 }
1073
1074 bool is_type_object(const type_t *type)
1075 {
1076         return !is_type_function(type) && !is_type_incomplete(type);
1077 }
1078
1079 /**
1080  * Check if two function types are compatible.
1081  */
1082 static bool function_types_compatible(const function_type_t *func1,
1083                                       const function_type_t *func2)
1084 {
1085         const type_t* const ret1 = skip_typeref(func1->return_type);
1086         const type_t* const ret2 = skip_typeref(func2->return_type);
1087         if (!types_compatible(ret1, ret2))
1088                 return false;
1089
1090         if (func1->linkage != func2->linkage)
1091                 return false;
1092
1093         if (func1->calling_convention != func2->calling_convention)
1094                 return false;
1095
1096         /* can parameters be compared? */
1097         if (func1->unspecified_parameters || func2->unspecified_parameters)
1098                 return true;
1099
1100         if (func1->variadic != func2->variadic)
1101                 return false;
1102
1103         /* TODO: handling of unspecified parameters not correct yet */
1104
1105         /* all argument types must be compatible */
1106         function_parameter_t *parameter1 = func1->parameters;
1107         function_parameter_t *parameter2 = func2->parameters;
1108         for ( ; parameter1 != NULL && parameter2 != NULL;
1109                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1110                 type_t *parameter1_type = skip_typeref(parameter1->type);
1111                 type_t *parameter2_type = skip_typeref(parameter2->type);
1112
1113                 parameter1_type = get_unqualified_type(parameter1_type);
1114                 parameter2_type = get_unqualified_type(parameter2_type);
1115
1116                 if (!types_compatible(parameter1_type, parameter2_type))
1117                         return false;
1118         }
1119         /* same number of arguments? */
1120         if (parameter1 != NULL || parameter2 != NULL)
1121                 return false;
1122
1123         return true;
1124 }
1125
1126 /**
1127  * Check if two array types are compatible.
1128  */
1129 static bool array_types_compatible(const array_type_t *array1,
1130                                    const array_type_t *array2)
1131 {
1132         type_t *element_type1 = skip_typeref(array1->element_type);
1133         type_t *element_type2 = skip_typeref(array2->element_type);
1134         if (!types_compatible(element_type1, element_type2))
1135                 return false;
1136
1137         if (!array1->size_constant || !array2->size_constant)
1138                 return true;
1139
1140         return array1->size == array2->size;
1141 }
1142
1143 /**
1144  * Check if two types are compatible.
1145  */
1146 bool types_compatible(const type_t *type1, const type_t *type2)
1147 {
1148         assert(!is_typeref(type1));
1149         assert(!is_typeref(type2));
1150
1151         /* shortcut: the same type is always compatible */
1152         if (type1 == type2)
1153                 return true;
1154
1155         if (!is_type_valid(type1) || !is_type_valid(type2))
1156                 return true;
1157
1158         if (type1->base.qualifiers != type2->base.qualifiers)
1159                 return false;
1160         if (type1->kind != type2->kind)
1161                 return false;
1162
1163         switch (type1->kind) {
1164         case TYPE_FUNCTION:
1165                 return function_types_compatible(&type1->function, &type2->function);
1166         case TYPE_ATOMIC:
1167                 return type1->atomic.akind == type2->atomic.akind;
1168         case TYPE_COMPLEX:
1169                 return type1->complex.akind == type2->complex.akind;
1170         case TYPE_IMAGINARY:
1171                 return type1->imaginary.akind == type2->imaginary.akind;
1172         case TYPE_ARRAY:
1173                 return array_types_compatible(&type1->array, &type2->array);
1174
1175         case TYPE_POINTER: {
1176                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1177                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1178                 return types_compatible(to1, to2);
1179         }
1180
1181         case TYPE_REFERENCE: {
1182                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1183                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1184                 return types_compatible(to1, to2);
1185         }
1186
1187         case TYPE_COMPOUND_STRUCT:
1188         case TYPE_COMPOUND_UNION:
1189         case TYPE_ENUM:
1190         case TYPE_BUILTIN:
1191                 /* TODO: not implemented */
1192                 break;
1193
1194         case TYPE_BITFIELD:
1195                 /* not sure if this makes sense or is even needed, implement it if you
1196                  * really need it! */
1197                 panic("type compatibility check for bitfield type");
1198
1199         case TYPE_ERROR:
1200                 /* Hmm, the error type should be compatible to all other types */
1201                 return true;
1202         case TYPE_INVALID:
1203                 panic("invalid type found in compatible types");
1204         case TYPE_TYPEDEF:
1205         case TYPE_TYPEOF:
1206                 panic("typerefs not skipped in compatible types?!?");
1207         }
1208
1209         /* TODO: incomplete */
1210         return false;
1211 }
1212
1213 /**
1214  * Skip all typerefs and return the underlying type.
1215  */
1216 type_t *skip_typeref(type_t *type)
1217 {
1218         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1219         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1220         il_alignment_t    alignment  = 0;
1221
1222         while (true) {
1223                 if (alignment < type->base.alignment)
1224                         alignment = type->base.alignment;
1225
1226                 switch (type->kind) {
1227                 case TYPE_ERROR:
1228                         return type;
1229                 case TYPE_TYPEDEF: {
1230                         qualifiers |= type->base.qualifiers;
1231                         modifiers  |= type->base.modifiers;
1232
1233                         const typedef_type_t *typedef_type = &type->typedeft;
1234                         if (typedef_type->resolved_type != NULL) {
1235                                 type = typedef_type->resolved_type;
1236                                 break;
1237                         }
1238                         type = typedef_type->typedefe->type;
1239                         continue;
1240                 }
1241                 case TYPE_TYPEOF:
1242                         qualifiers |= type->base.qualifiers;
1243                         modifiers  |= type->base.modifiers;
1244                         type        = type->typeoft.typeof_type;
1245                         continue;
1246                 default:
1247                         break;
1248                 }
1249                 break;
1250         }
1251
1252         if (qualifiers != TYPE_QUALIFIER_NONE ||
1253                         modifiers  != TYPE_MODIFIER_NONE  ||
1254                         alignment  >  type->base.alignment) {
1255                 type_t *const copy = duplicate_type(type);
1256
1257                 /* for const with typedefed array type the element type has to be
1258                  * adjusted */
1259                 if (is_type_array(copy)) {
1260                         type_t *element_type           = copy->array.element_type;
1261                         element_type                   = duplicate_type(element_type);
1262                         element_type->base.qualifiers |= qualifiers;
1263                         element_type->base.modifiers  |= modifiers;
1264                         element_type->base.alignment   = alignment;
1265                         copy->array.element_type       = element_type;
1266                 } else {
1267                         copy->base.qualifiers |= qualifiers;
1268                         copy->base.modifiers  |= modifiers;
1269                         copy->base.alignment   = alignment;
1270                 }
1271
1272                 type = identify_new_type(copy);
1273         }
1274
1275         return type;
1276 }
1277
1278 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1279 {
1280         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1281
1282         while (true) {
1283                 switch (type->base.kind) {
1284                 case TYPE_ERROR:
1285                         return TYPE_QUALIFIER_NONE;
1286                 case TYPE_TYPEDEF:
1287                         qualifiers |= type->base.qualifiers;
1288                         const typedef_type_t *typedef_type = &type->typedeft;
1289                         if (typedef_type->resolved_type != NULL)
1290                                 type = typedef_type->resolved_type;
1291                         else
1292                                 type = typedef_type->typedefe->type;
1293                         continue;
1294                 case TYPE_TYPEOF:
1295                         type = type->typeoft.typeof_type;
1296                         continue;
1297                 case TYPE_ARRAY:
1298                         if (skip_array_type) {
1299                                 type = type->array.element_type;
1300                                 continue;
1301                         }
1302                         break;
1303                 default:
1304                         break;
1305                 }
1306                 break;
1307         }
1308         return type->base.qualifiers | qualifiers;
1309 }
1310
1311 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1312 {
1313         assert(kind <= ATOMIC_TYPE_LAST);
1314         return atomic_type_properties[kind].size;
1315 }
1316
1317 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1318 {
1319         assert(kind <= ATOMIC_TYPE_LAST);
1320         return atomic_type_properties[kind].alignment;
1321 }
1322
1323 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1324 {
1325         assert(kind <= ATOMIC_TYPE_LAST);
1326         return atomic_type_properties[kind].flags;
1327 }
1328
1329 atomic_type_kind_t get_intptr_kind(void)
1330 {
1331         if (machine_size <= 32)
1332                 return ATOMIC_TYPE_INT;
1333         else if (machine_size <= 64)
1334                 return ATOMIC_TYPE_LONG;
1335         else
1336                 return ATOMIC_TYPE_LONGLONG;
1337 }
1338
1339 atomic_type_kind_t get_uintptr_kind(void)
1340 {
1341         if (machine_size <= 32)
1342                 return ATOMIC_TYPE_UINT;
1343         else if (machine_size <= 64)
1344                 return ATOMIC_TYPE_ULONG;
1345         else
1346                 return ATOMIC_TYPE_ULONGLONG;
1347 }
1348
1349 /**
1350  * Find the atomic type kind representing a given size (signed).
1351  */
1352 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1353 {
1354         static atomic_type_kind_t kinds[32];
1355
1356         assert(size < 32);
1357         atomic_type_kind_t kind = kinds[size];
1358         if (kind == ATOMIC_TYPE_INVALID) {
1359                 static const atomic_type_kind_t possible_kinds[] = {
1360                         ATOMIC_TYPE_SCHAR,
1361                         ATOMIC_TYPE_SHORT,
1362                         ATOMIC_TYPE_INT,
1363                         ATOMIC_TYPE_LONG,
1364                         ATOMIC_TYPE_LONGLONG
1365                 };
1366                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1367                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1368                                 kind = possible_kinds[i];
1369                                 break;
1370                         }
1371                 }
1372                 kinds[size] = kind;
1373         }
1374         return kind;
1375 }
1376
1377 /**
1378  * Find the atomic type kind representing a given size (signed).
1379  */
1380 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1381 {
1382         static atomic_type_kind_t kinds[32];
1383
1384         assert(size < 32);
1385         atomic_type_kind_t kind = kinds[size];
1386         if (kind == ATOMIC_TYPE_INVALID) {
1387                 static const atomic_type_kind_t possible_kinds[] = {
1388                         ATOMIC_TYPE_UCHAR,
1389                         ATOMIC_TYPE_USHORT,
1390                         ATOMIC_TYPE_UINT,
1391                         ATOMIC_TYPE_ULONG,
1392                         ATOMIC_TYPE_ULONGLONG
1393                 };
1394                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1395                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1396                                 kind = possible_kinds[i];
1397                                 break;
1398                         }
1399                 }
1400                 kinds[size] = kind;
1401         }
1402         return kind;
1403 }
1404
1405 /**
1406  * Hash the given type and return the "singleton" version
1407  * of it.
1408  */
1409 type_t *identify_new_type(type_t *type)
1410 {
1411         type_t *result = typehash_insert(type);
1412         if (result != type) {
1413                 obstack_free(type_obst, type);
1414         }
1415         return result;
1416 }
1417
1418 /**
1419  * Creates a new atomic type.
1420  *
1421  * @param akind       The kind of the atomic type.
1422  * @param qualifiers  Type qualifiers for the new type.
1423  */
1424 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1425 {
1426         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1427         memset(type, 0, sizeof(atomic_type_t));
1428
1429         type->kind            = TYPE_ATOMIC;
1430         type->base.size       = get_atomic_type_size(akind);
1431         type->base.alignment  = get_atomic_type_alignment(akind);
1432         type->base.qualifiers = qualifiers;
1433         type->atomic.akind    = akind;
1434
1435         return identify_new_type(type);
1436 }
1437
1438 /**
1439  * Creates a new complex type.
1440  *
1441  * @param akind       The kind of the atomic type.
1442  * @param qualifiers  Type qualifiers for the new type.
1443  */
1444 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1445 {
1446         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1447         memset(type, 0, sizeof(complex_type_t));
1448
1449         type->kind            = TYPE_COMPLEX;
1450         type->base.qualifiers = qualifiers;
1451         type->base.alignment  = get_atomic_type_alignment(akind);
1452         type->complex.akind   = akind;
1453
1454         return identify_new_type(type);
1455 }
1456
1457 /**
1458  * Creates a new imaginary type.
1459  *
1460  * @param akind       The kind of the atomic type.
1461  * @param qualifiers  Type qualifiers for the new type.
1462  */
1463 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1464 {
1465         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1466         memset(type, 0, sizeof(imaginary_type_t));
1467
1468         type->kind            = TYPE_IMAGINARY;
1469         type->base.qualifiers = qualifiers;
1470         type->base.alignment  = get_atomic_type_alignment(akind);
1471         type->imaginary.akind = akind;
1472
1473         return identify_new_type(type);
1474 }
1475
1476 /**
1477  * Creates a new pointer type.
1478  *
1479  * @param points_to   The points-to type for the new type.
1480  * @param qualifiers  Type qualifiers for the new type.
1481  */
1482 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1483 {
1484         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1485         memset(type, 0, sizeof(pointer_type_t));
1486
1487         type->kind                  = TYPE_POINTER;
1488         type->base.qualifiers       = qualifiers;
1489         type->base.alignment        = 0;
1490         type->pointer.points_to     = points_to;
1491         type->pointer.base_variable = NULL;
1492
1493         return identify_new_type(type);
1494 }
1495
1496 /**
1497  * Creates a new reference type.
1498  *
1499  * @param refers_to   The referred-to type for the new type.
1500  */
1501 type_t *make_reference_type(type_t *refers_to)
1502 {
1503         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1504         memset(type, 0, sizeof(reference_type_t));
1505
1506         type->kind                = TYPE_REFERENCE;
1507         type->base.qualifiers     = 0;
1508         type->base.alignment      = 0;
1509         type->reference.refers_to = refers_to;
1510
1511         return identify_new_type(type);
1512 }
1513
1514 /**
1515  * Creates a new based pointer type.
1516  *
1517  * @param points_to   The points-to type for the new type.
1518  * @param qualifiers  Type qualifiers for the new type.
1519  * @param variable    The based variable
1520  */
1521 type_t *make_based_pointer_type(type_t *points_to,
1522                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1523 {
1524         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1525         memset(type, 0, sizeof(pointer_type_t));
1526
1527         type->kind                  = TYPE_POINTER;
1528         type->base.qualifiers       = qualifiers;
1529         type->base.alignment        = 0;
1530         type->pointer.points_to     = points_to;
1531         type->pointer.base_variable = variable;
1532
1533         return identify_new_type(type);
1534 }
1535
1536
1537 type_t *make_array_type(type_t *element_type, size_t size,
1538                         type_qualifiers_t qualifiers)
1539 {
1540         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1541         memset(type, 0, sizeof(array_type_t));
1542
1543         type->kind                = TYPE_ARRAY;
1544         type->base.qualifiers     = qualifiers;
1545         type->base.alignment      = 0;
1546         type->array.element_type  = element_type;
1547         type->array.size          = size;
1548         type->array.size_constant = true;
1549
1550         return identify_new_type(type);
1551 }
1552
1553 /**
1554  * Debug helper. Prints the given type to stdout.
1555  */
1556 static __attribute__((unused))
1557 void dbg_type(const type_t *type)
1558 {
1559         FILE *old_out = out;
1560         out = stderr;
1561         print_type(type);
1562         puts("\n");
1563         fflush(stderr);
1564         out = old_out;
1565 }