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 "lang_features.h"
  31
  32 static struct obstack   _type_obst;
  33 static FILE            *out;
  34 struct obstack         *type_obst                 = &_type_obst;
  35 static int              type_visited              = 0;
  36 static bool             print_implicit_array_size = false;
  37
  38 static void intern_print_type_pre(const type_t *type, bool top);
  39 static void intern_print_type_post(const type_t *type, bool top);
  40
  41 typedef struct atomic_type_properties_t atomic_type_properties_t;
  42 struct atomic_type_properties_t {
  43         unsigned   size;              /**< type size in bytes */
  44         unsigned   alignment;         /**< type alignment in bytes */
  45         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  46 };
  47
  48 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  49         //ATOMIC_TYPE_INVALID = 0,
  50         [ATOMIC_TYPE_VOID] = {
  51                 .size       = 0,
  52                 .alignment  = 0,
  53                 .flags      = ATOMIC_TYPE_FLAG_NONE
  54         },
  55         [ATOMIC_TYPE_WCHAR_T] = {
  56                 .size       = (unsigned)-1,
  57                 .alignment  = (unsigned)-1,
  58                 /* signed flag will be set when known */
  59                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  60         },
  61         [ATOMIC_TYPE_CHAR] = {
  62                 .size       = 1,
  63                 .alignment  = 1,
  64                 /* signed flag will be set when known */
  65                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  66         },
  67         [ATOMIC_TYPE_SCHAR] = {
  68                 .size       = 1,
  69                 .alignment  = 1,
  70                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  71                               | ATOMIC_TYPE_FLAG_SIGNED,
  72         },
  73         [ATOMIC_TYPE_UCHAR] = {
  74                 .size       = 1,
  75                 .alignment  = 1,
  76                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  77         },
  78         [ATOMIC_TYPE_SHORT] = {
  79                 .size       = 2,
  80                 .alignment  = 2,
  81                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  82                               | ATOMIC_TYPE_FLAG_SIGNED
  83         },
  84         [ATOMIC_TYPE_USHORT] = {
  85                 .size       = 2,
  86                 .alignment  = 2,
  87                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  88         },
  89         [ATOMIC_TYPE_INT] = {
  90                 .size       = (unsigned) -1,
  91                 .alignment  = (unsigned) -1,
  92                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  93                               | ATOMIC_TYPE_FLAG_SIGNED,
  94         },
  95         [ATOMIC_TYPE_UINT] = {
  96                 .size       = (unsigned) -1,
  97                 .alignment  = (unsigned) -1,
  98                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  99         },
 100         [ATOMIC_TYPE_LONG] = {
 101                 .size       = (unsigned) -1,
 102                 .alignment  = (unsigned) -1,
 103                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 104                               | ATOMIC_TYPE_FLAG_SIGNED,
 105         },
 106         [ATOMIC_TYPE_ULONG] = {
 107                 .size       = (unsigned) -1,
 108                 .alignment  = (unsigned) -1,
 109                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 110         },
 111         [ATOMIC_TYPE_LONGLONG] = {
 112                 .size       = (unsigned) -1,
 113                 .alignment  = (unsigned) -1,
 114                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 115                               | ATOMIC_TYPE_FLAG_SIGNED,
 116         },
 117         [ATOMIC_TYPE_ULONGLONG] = {
 118                 .size       = (unsigned) -1,
 119                 .alignment  = (unsigned) -1,
 120                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 121         },
 122         [ATOMIC_TYPE_BOOL] = {
 123                 .size       = (unsigned) -1,
 124                 .alignment  = (unsigned) -1,
 125                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 126         },
 127         [ATOMIC_TYPE_FLOAT] = {
 128                 .size       = 4,
 129                 .alignment  = (unsigned) -1,
 130                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 131                               | ATOMIC_TYPE_FLAG_SIGNED,
 132         },
 133         [ATOMIC_TYPE_DOUBLE] = {
 134                 .size       = 8,
 135                 .alignment  = (unsigned) -1,
 136                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 137                               | ATOMIC_TYPE_FLAG_SIGNED,
 138         },
 139         [ATOMIC_TYPE_LONG_DOUBLE] = {
 140                 .size       = 12,
 141                 .alignment  = (unsigned) -1,
 142                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 143                               | ATOMIC_TYPE_FLAG_SIGNED,
 144         },
 145         /* complex and imaginary types are set in init_types */
 146 };
 147
 148 void init_types(void)
 149 {
 150         obstack_init(type_obst);
 151
 152         atomic_type_properties_t *props = atomic_type_properties;
 153
 154         if (char_is_signed) {
 155                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 156         }
 157
 158         unsigned int_size   = machine_size < 32 ? 2 : 4;
 159         unsigned long_size  = machine_size < 64 ? 4 : 8;
 160         unsigned llong_size = machine_size < 32 ? 4 : 8;
 161
 162         props[ATOMIC_TYPE_INT].size            = int_size;
 163         props[ATOMIC_TYPE_INT].alignment       = int_size;
 164         props[ATOMIC_TYPE_UINT].size           = int_size;
 165         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 166         props[ATOMIC_TYPE_LONG].size           = long_size;
 167         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 168         props[ATOMIC_TYPE_ULONG].size          = long_size;
 169         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 170         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 171         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 172         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 173         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 174
 175         /* TODO: backend specific, need a way to query the backend for this.
 176          * The following are good settings for x86 */
 177         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 178         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 179         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 180         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 181         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 182
 183         /* TODO: make this configurable for platforms which do not use byte sized
 184          * bools. */
 185         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 186
 187         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 188 }
 189
 190 void exit_types(void)
 191 {
 192         obstack_free(type_obst, NULL);
 193 }
 194
 195 void type_set_output(FILE *stream)
 196 {
 197         out = stream;
 198 }
 199
 200 void inc_type_visited(void)
 201 {
 202         type_visited++;
 203 }
 204
 205 void print_type_qualifiers(type_qualifiers_t qualifiers)
 206 {
 207         int first = 1;
 208         if (qualifiers & TYPE_QUALIFIER_CONST) {
 209                 fputs(" const" + first,    out);
 210                 first = 0;
 211         }
 212         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 213                 fputs(" volatile" + first, out);
 214                 first = 0;
 215         }
 216         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 217                 fputs(" restrict" + first, out);
 218                 first = 0;
 219         }
 220 }
 221
 222 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 223 {
 224         switch(kind) {
 225         case ATOMIC_TYPE_INVALID: break;
 226         case ATOMIC_TYPE_VOID:        return "void";
 227         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 228         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 229         case ATOMIC_TYPE_CHAR:        return "char";
 230         case ATOMIC_TYPE_SCHAR:       return "signed char";
 231         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 232         case ATOMIC_TYPE_INT:         return "int";
 233         case ATOMIC_TYPE_UINT:        return "unsigned int";
 234         case ATOMIC_TYPE_SHORT:       return "short";
 235         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 236         case ATOMIC_TYPE_LONG:        return "long";
 237         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 238         case ATOMIC_TYPE_LONGLONG:    return "long long";
 239         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 240         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 241         case ATOMIC_TYPE_FLOAT:       return "float";
 242         case ATOMIC_TYPE_DOUBLE:      return "double";
 243         }
 244         return "INVALIDATOMIC";
 245 }
 246
 247 /**
 248  * Prints the name of an atomic type kinds.
 249  *
 250  * @param kind  The type kind.
 251  */
 252 static void print_atomic_kinds(atomic_type_kind_t kind)
 253 {
 254         const char *s = get_atomic_kind_name(kind);
 255         fputs(s, out);
 256 }
 257
 258 /**
 259  * Prints the name of an atomic type.
 260  *
 261  * @param type  The type.
 262  */
 263 static void print_atomic_type(const atomic_type_t *type)
 264 {
 265         print_type_qualifiers(type->base.qualifiers);
 266         if (type->base.qualifiers != 0)
 267                 fputc(' ', out);
 268         print_atomic_kinds(type->akind);
 269 }
 270
 271 /**
 272  * Prints the name of a complex type.
 273  *
 274  * @param type  The type.
 275  */
 276 static
 277 void print_complex_type(const complex_type_t *type)
 278 {
 279         int empty = type->base.qualifiers == 0;
 280         print_type_qualifiers(type->base.qualifiers);
 281         fputs(" _Complex " + empty, out);
 282         print_atomic_kinds(type->akind);
 283 }
 284
 285 /**
 286  * Prints the name of an imaginary type.
 287  *
 288  * @param type  The type.
 289  */
 290 static
 291 void print_imaginary_type(const imaginary_type_t *type)
 292 {
 293         int empty = type->base.qualifiers == 0;
 294         print_type_qualifiers(type->base.qualifiers);
 295         fputs(" _Imaginary " + empty, out);
 296         print_atomic_kinds(type->akind);
 297 }
 298
 299 /**
 300  * Print the first part (the prefix) of a type.
 301  *
 302  * @param type   The type to print.
 303  * @param top    true, if this is the top type, false if it's an embedded type.
 304  */
 305 static void print_function_type_pre(const function_type_t *type, bool top)
 306 {
 307         switch (type->linkage) {
 308                 case LINKAGE_INVALID:
 309                         break;
 310
 311                 case LINKAGE_C:
 312                         if (c_mode & _CXX)
 313                                 fputs("extern \"C\" ",   out);
 314                         break;
 315
 316                 case LINKAGE_CXX:
 317                         if (!(c_mode & _CXX))
 318                                 fputs("extern \"C++\" ", out);
 319                         break;
 320         }
 321
 322         print_type_qualifiers(type->base.qualifiers);
 323         if (type->base.qualifiers != 0)
 324                 fputc(' ', out);
 325
 326         intern_print_type_pre(type->return_type, false);
 327
 328         switch (type->calling_convention) {
 329         case CC_CDECL:    fputs("__cdecl ",    out); break;
 330         case CC_STDCALL:  fputs("__stdcall ",  out); break;
 331         case CC_FASTCALL: fputs("__fastcall ", out); break;
 332         case CC_THISCALL: fputs("__thiscall ", out); break;
 333         case CC_DEFAULT:  break;
 334         }
 335
 336         /* don't emit parenthesis if we're the toplevel type... */
 337         if (!top)
 338                 fputc('(', out);
 339 }
 340
 341 /**
 342  * Print the second part (the postfix) of a type.
 343  *
 344  * @param type   The type to print.
 345  * @param top    true, if this is the top type, false if it's an embedded type.
 346  */
 347 static void print_function_type_post(const function_type_t *type,
 348                                      const scope_t *parameters, bool top)
 349 {
 350         /* don't emit parenthesis if we're the toplevel type... */
 351         if (!top)
 352                 fputc(')', out);
 353
 354         fputc('(', out);
 355         bool first = true;
 356         if (parameters == NULL) {
 357                 function_parameter_t *parameter = type->parameters;
 358                 for( ; parameter != NULL; parameter = parameter->next) {
 359                         if (first) {
 360                                 first = false;
 361                         } else {
 362                                 fputs(", ", out);
 363                         }
 364                         print_type(parameter->type);
 365                 }
 366         } else {
 367                 entity_t *parameter = parameters->entities;
 368                 for (; parameter != NULL; parameter = parameter->base.next) {
 369                         if (first) {
 370                                 first = false;
 371                         } else {
 372                                 fputs(", ", out);
 373                         }
 374                         assert(is_declaration(parameter));
 375                         const type_t *const type = parameter->declaration.type;
 376                         if (type == NULL) {
 377                                 fputs(parameter->base.symbol->string, out);
 378                         } else {
 379                                 print_type_ext(type, parameter->base.symbol, NULL);
 380                         }
 381                 }
 382         }
 383         if (type->variadic) {
 384                 if (first) {
 385                         first = false;
 386                 } else {
 387                         fputs(", ", out);
 388                 }
 389                 fputs("...", out);
 390         }
 391         if (first && !type->unspecified_parameters) {
 392                 fputs("void", out);
 393         }
 394         fputc(')', out);
 395
 396         intern_print_type_post(type->return_type, false);
 397 }
 398
 399 /**
 400  * Prints the prefix part of a pointer type.
 401  *
 402  * @param type   The pointer type.
 403  */
 404 static void print_pointer_type_pre(const pointer_type_t *type)
 405 {
 406         intern_print_type_pre(type->points_to, false);
 407         variable_t *const variable = type->base_variable;
 408         if (variable != NULL) {
 409                 fputs(" __based(", out);
 410                 fputs(variable->base.base.symbol->string, out);
 411                 fputs(") ", out);
 412         }
 413         fputc('*', out);
 414         print_type_qualifiers(type->base.qualifiers);
 415         if (type->base.qualifiers != 0)
 416                 fputc(' ', out);
 417 }
 418
 419 /**
 420  * Prints the prefix part of a reference type.
 421  *
 422  * @param type   The reference type.
 423  */
 424 static void print_reference_type_pre(const reference_type_t *type)
 425 {
 426         intern_print_type_pre(type->refers_to, false);
 427         fputc('&', out);
 428 }
 429
 430 /**
 431  * Prints the postfix part of a pointer type.
 432  *
 433  * @param type   The pointer type.
 434  */
 435 static void print_pointer_type_post(const pointer_type_t *type)
 436 {
 437         intern_print_type_post(type->points_to, false);
 438 }
 439
 440 /**
 441  * Prints the postfix part of a reference type.
 442  *
 443  * @param type   The reference type.
 444  */
 445 static void print_reference_type_post(const reference_type_t *type)
 446 {
 447         intern_print_type_post(type->refers_to, false);
 448 }
 449
 450 /**
 451  * Prints the prefix part of an array type.
 452  *
 453  * @param type   The array type.
 454  */
 455 static void print_array_type_pre(const array_type_t *type)
 456 {
 457         intern_print_type_pre(type->element_type, false);
 458 }
 459
 460 /**
 461  * Prints the postfix part of an array type.
 462  *
 463  * @param type   The array type.
 464  */
 465 static void print_array_type_post(const array_type_t *type)
 466 {
 467         fputc('[', out);
 468         if (type->is_static) {
 469                 fputs("static ", out);
 470         }
 471         print_type_qualifiers(type->base.qualifiers);
 472         if (type->base.qualifiers != 0)
 473                 fputc(' ', out);
 474         if (type->size_expression != NULL
 475                         && (print_implicit_array_size || !type->has_implicit_size)) {
 476                 print_expression(type->size_expression);
 477         }
 478         fputc(']', out);
 479         intern_print_type_post(type->element_type, false);
 480 }
 481
 482 /**
 483  * Prints the postfix part of a bitfield type.
 484  *
 485  * @param type   The array type.
 486  */
 487 static void print_bitfield_type_post(const bitfield_type_t *type)
 488 {
 489         fputs(" : ", out);
 490         print_expression(type->size_expression);
 491         intern_print_type_post(type->base_type, false);
 492 }
 493
 494 /**
 495  * Prints an enum definition.
 496  *
 497  * @param declaration  The enum's type declaration.
 498  */
 499 void print_enum_definition(const enum_t *enume)
 500 {
 501         fputs("{\n", out);
 502
 503         change_indent(1);
 504
 505         entity_t *entry = enume->base.next;
 506         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 507                entry = entry->base.next) {
 508
 509                 print_indent();
 510                 fputs(entry->base.symbol->string, out);
 511                 if (entry->enum_value.value != NULL) {
 512                         fputs(" = ", out);
 513
 514                         /* skip the implicit cast */
 515                         expression_t *expression = entry->enum_value.value;
 516                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 517                                 expression = expression->unary.value;
 518                         }
 519                         print_expression(expression);
 520                 }
 521                 fputs(",\n", out);
 522         }
 523
 524         change_indent(-1);
 525         print_indent();
 526         fputc('}', out);
 527 }
 528
 529 /**
 530  * Prints an enum type.
 531  *
 532  * @param type  The enum type.
 533  */
 534 static void print_type_enum(const enum_type_t *type)
 535 {
 536         int empty = type->base.qualifiers == 0;
 537         print_type_qualifiers(type->base.qualifiers);
 538         fputs(" enum " + empty, out);
 539
 540         enum_t   *enume  = type->enume;
 541         symbol_t *symbol = enume->base.symbol;
 542         if (symbol != NULL) {
 543                 fputs(symbol->string, out);
 544         } else {
 545                 print_enum_definition(enume);
 546         }
 547 }
 548
 549 /**
 550  * Print the compound part of a compound type.
 551  */
 552 void print_compound_definition(const compound_t *compound)
 553 {
 554         fputs("{\n", out);
 555         change_indent(1);
 556
 557         entity_t *entity = compound->members.entities;
 558         for( ; entity != NULL; entity = entity->base.next) {
 559                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 560                         continue;
 561
 562                 print_indent();
 563                 print_entity(entity);
 564                 fputc('\n', out);
 565         }
 566
 567         change_indent(-1);
 568         print_indent();
 569         fputc('}', out);
 570         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 571                 fputs("__attribute__((__transparent_union__))", out);
 572         }
 573 }
 574
 575 /**
 576  * Prints a compound type.
 577  *
 578  * @param type  The compound type.
 579  */
 580 static void print_compound_type(const compound_type_t *type)
 581 {
 582         int empty = type->base.qualifiers == 0;
 583         print_type_qualifiers(type->base.qualifiers);
 584
 585         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 586                 fputs(" struct " + empty, out);
 587         } else {
 588                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 589                 fputs(" union " + empty, out);
 590         }
 591
 592         compound_t *compound = type->compound;
 593         symbol_t   *symbol   = compound->base.symbol;
 594         if (symbol != NULL) {
 595                 fputs(symbol->string, out);
 596         } else {
 597                 print_compound_definition(compound);
 598         }
 599 }
 600
 601 /**
 602  * Prints the prefix part of a typedef type.
 603  *
 604  * @param type   The typedef type.
 605  */
 606 static void print_typedef_type_pre(const typedef_type_t *const type)
 607 {
 608         print_type_qualifiers(type->base.qualifiers);
 609         if (type->base.qualifiers != 0)
 610                 fputc(' ', out);
 611         fputs(type->typedefe->base.symbol->string, out);
 612 }
 613
 614 /**
 615  * Prints the prefix part of a typeof type.
 616  *
 617  * @param type   The typeof type.
 618  */
 619 static void print_typeof_type_pre(const typeof_type_t *const type)
 620 {
 621         fputs("typeof(", out);
 622         if (type->expression != NULL) {
 623                 assert(type->typeof_type == NULL);
 624                 print_expression(type->expression);
 625         } else {
 626                 print_type(type->typeof_type);
 627         }
 628         fputc(')', out);
 629 }
 630
 631 /**
 632  * Prints the prefix part of a type.
 633  *
 634  * @param type   The type.
 635  * @param top    true if we print the toplevel type, false else.
 636  */
 637 static void intern_print_type_pre(const type_t *const type, const bool top)
 638 {
 639         switch(type->kind) {
 640         case TYPE_ERROR:
 641                 fputs("<error>", out);
 642                 return;
 643         case TYPE_INVALID:
 644                 fputs("<invalid>", out);
 645                 return;
 646         case TYPE_ENUM:
 647                 print_type_enum(&type->enumt);
 648                 return;
 649         case TYPE_ATOMIC:
 650                 print_atomic_type(&type->atomic);
 651                 return;
 652         case TYPE_COMPLEX:
 653                 print_complex_type(&type->complex);
 654                 return;
 655         case TYPE_IMAGINARY:
 656                 print_imaginary_type(&type->imaginary);
 657                 return;
 658         case TYPE_COMPOUND_STRUCT:
 659         case TYPE_COMPOUND_UNION:
 660                 print_compound_type(&type->compound);
 661                 return;
 662         case TYPE_BUILTIN:
 663                 fputs(type->builtin.symbol->string, out);
 664                 return;
 665         case TYPE_FUNCTION:
 666                 print_function_type_pre(&type->function, top);
 667                 return;
 668         case TYPE_POINTER:
 669                 print_pointer_type_pre(&type->pointer);
 670                 return;
 671         case TYPE_REFERENCE:
 672                 print_reference_type_pre(&type->reference);
 673                 return;
 674         case TYPE_BITFIELD:
 675                 intern_print_type_pre(type->bitfield.base_type, top);
 676                 return;
 677         case TYPE_ARRAY:
 678                 print_array_type_pre(&type->array);
 679                 return;
 680         case TYPE_TYPEDEF:
 681                 print_typedef_type_pre(&type->typedeft);
 682                 return;
 683         case TYPE_TYPEOF:
 684                 print_typeof_type_pre(&type->typeoft);
 685                 return;
 686         }
 687         fputs("unknown", out);
 688 }
 689
 690 /**
 691  * Prints the postfix part of a type.
 692  *
 693  * @param type   The type.
 694  * @param top    true if we print the toplevel type, false else.
 695  */
 696 static void intern_print_type_post(const type_t *const type, const bool top)
 697 {
 698         switch(type->kind) {
 699         case TYPE_FUNCTION:
 700                 print_function_type_post(&type->function, NULL, top);
 701                 return;
 702         case TYPE_POINTER:
 703                 print_pointer_type_post(&type->pointer);
 704                 return;
 705         case TYPE_REFERENCE:
 706                 print_reference_type_post(&type->reference);
 707                 return;
 708         case TYPE_ARRAY:
 709                 print_array_type_post(&type->array);
 710                 return;
 711         case TYPE_BITFIELD:
 712                 print_bitfield_type_post(&type->bitfield);
 713                 return;
 714         case TYPE_ERROR:
 715         case TYPE_INVALID:
 716         case TYPE_ATOMIC:
 717         case TYPE_COMPLEX:
 718         case TYPE_IMAGINARY:
 719         case TYPE_ENUM:
 720         case TYPE_COMPOUND_STRUCT:
 721         case TYPE_COMPOUND_UNION:
 722         case TYPE_BUILTIN:
 723         case TYPE_TYPEOF:
 724         case TYPE_TYPEDEF:
 725                 break;
 726         }
 727
 728         if (type->base.modifiers & DM_TRANSPARENT_UNION) {
 729                 fputs("__attribute__((__transparent_union__))", out);
 730         }
 731 }
 732
 733 /**
 734  * Prints a type.
 735  *
 736  * @param type   The type.
 737  */
 738 void print_type(const type_t *const type)
 739 {
 740         print_type_ext(type, NULL, NULL);
 741 }
 742
 743 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 744                     const scope_t *parameters)
 745 {
 746         if (type == NULL) {
 747                 fputs("nil type", out);
 748                 return;
 749         }
 750
 751         intern_print_type_pre(type, true);
 752         if (symbol != NULL) {
 753                 fputc(' ', out);
 754                 fputs(symbol->string, out);
 755         }
 756         if (type->kind == TYPE_FUNCTION) {
 757                 print_function_type_post(&type->function, parameters, true);
 758         } else {
 759                 intern_print_type_post(type, true);
 760         }
 761 }
 762
 763 /**
 764  * Return the size of a type AST node.
 765  *
 766  * @param type  The type.
 767  */
 768 static size_t get_type_size(const type_t *type)
 769 {
 770         switch(type->kind) {
 771         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 772         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 773         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 774         case TYPE_COMPOUND_STRUCT:
 775         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 776         case TYPE_ENUM:            return sizeof(enum_type_t);
 777         case TYPE_FUNCTION:        return sizeof(function_type_t);
 778         case TYPE_POINTER:         return sizeof(pointer_type_t);
 779         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 780         case TYPE_ARRAY:           return sizeof(array_type_t);
 781         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 782         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 783         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 784         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 785         case TYPE_ERROR:           panic("error type found");
 786         case TYPE_INVALID:         panic("invalid type found");
 787         }
 788         panic("unknown type found");
 789 }
 790
 791 /**
 792  * Duplicates a type.
 793  *
 794  * @param type  The type to copy.
 795  * @return A copy of the type.
 796  *
 797  * @note This does not produce a deep copy!
 798  */
 799 type_t *duplicate_type(const type_t *type)
 800 {
 801         size_t size = get_type_size(type);
 802
 803         type_t *copy = obstack_alloc(type_obst, size);
 804         memcpy(copy, type, size);
 805
 806         return copy;
 807 }
 808
 809 /**
 810  * Returns the unqualified type of a given type.
 811  *
 812  * @param type  The type.
 813  * @returns The unqualified type.
 814  */
 815 type_t *get_unqualified_type(type_t *type)
 816 {
 817         assert(!is_typeref(type));
 818
 819         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 820                 return type;
 821
 822         type_t *unqualified_type          = duplicate_type(type);
 823         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 824
 825         type_t *result = typehash_insert(unqualified_type);
 826         if (result != unqualified_type) {
 827                 obstack_free(type_obst, unqualified_type);
 828         }
 829
 830         return result;
 831 }
 832
 833 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 834 {
 835         type_t *type = skip_typeref(orig_type);
 836
 837         type_t *copy;
 838         if (is_type_array(type)) {
 839                 /* For array types the element type has to be adjusted */
 840                 type_t *element_type      = type->array.element_type;
 841                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 842
 843                 if (qual_element_type == element_type)
 844                         return orig_type;
 845
 846                 copy                     = duplicate_type(type);
 847                 copy->array.element_type = qual_element_type;
 848         } else if (is_type_valid(type)) {
 849                 if ((type->base.qualifiers & qual) == qual)
 850                         return orig_type;
 851
 852                 copy                   = duplicate_type(type);
 853                 copy->base.qualifiers |= qual;
 854         } else {
 855                 return type;
 856         }
 857
 858         type = typehash_insert(copy);
 859         if (type != copy)
 860                 obstack_free(type_obst, copy);
 861
 862         return type;
 863 }
 864
 865 /**
 866  * Check if a type is valid.
 867  *
 868  * @param type  The type to check.
 869  * @return true if type represents a valid type.
 870  */
 871 bool type_valid(const type_t *type)
 872 {
 873         return type->kind != TYPE_INVALID;
 874 }
 875
 876 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 877                                   atomic_type_flag_t flag)
 878 {
 879         assert(kind <= ATOMIC_TYPE_LAST);
 880         return (atomic_type_properties[kind].flags & flag) != 0;
 881 }
 882
 883 /**
 884  * Returns true if the given type is an integer type.
 885  *
 886  * @param type  The type to check.
 887  * @return True if type is an integer type.
 888  */
 889 bool is_type_integer(const type_t *type)
 890 {
 891         assert(!is_typeref(type));
 892
 893         if (type->kind == TYPE_ENUM)
 894                 return true;
 895         if (type->kind == TYPE_BITFIELD)
 896                 return true;
 897
 898         if (type->kind != TYPE_ATOMIC)
 899                 return false;
 900
 901         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 902 }
 903
 904 /**
 905  * Returns true if the given type is an enum type.
 906  *
 907  * @param type  The type to check.
 908  * @return True if type is an enum type.
 909  */
 910 bool is_type_enum(const type_t *type)
 911 {
 912         assert(!is_typeref(type));
 913         return type->kind == TYPE_ENUM;
 914 }
 915
 916 /**
 917  * Returns true if the given type is an floating point type.
 918  *
 919  * @param type  The type to check.
 920  * @return True if type is a floating point type.
 921  */
 922 bool is_type_float(const type_t *type)
 923 {
 924         assert(!is_typeref(type));
 925
 926         if (type->kind != TYPE_ATOMIC)
 927                 return false;
 928
 929         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 930 }
 931
 932 /**
 933  * Returns true if the given type is an complex type.
 934  *
 935  * @param type  The type to check.
 936  * @return True if type is a complex type.
 937  */
 938 bool is_type_complex(const type_t *type)
 939 {
 940         assert(!is_typeref(type));
 941
 942         if (type->kind != TYPE_ATOMIC)
 943                 return false;
 944
 945         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 946 }
 947
 948 /**
 949  * Returns true if the given type is a signed type.
 950  *
 951  * @param type  The type to check.
 952  * @return True if type is a signed type.
 953  */
 954 bool is_type_signed(const type_t *type)
 955 {
 956         assert(!is_typeref(type));
 957
 958         /* enum types are int for now */
 959         if (type->kind == TYPE_ENUM)
 960                 return true;
 961         if (type->kind == TYPE_BITFIELD)
 962                 return is_type_signed(type->bitfield.base_type);
 963
 964         if (type->kind != TYPE_ATOMIC)
 965                 return false;
 966
 967         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 968 }
 969
 970 /**
 971  * Returns true if the given type represents an arithmetic type.
 972  *
 973  * @param type  The type to check.
 974  * @return True if type represents an arithmetic type.
 975  */
 976 bool is_type_arithmetic(const type_t *type)
 977 {
 978         assert(!is_typeref(type));
 979
 980         switch(type->kind) {
 981         case TYPE_BITFIELD:
 982         case TYPE_ENUM:
 983                 return true;
 984         case TYPE_ATOMIC:
 985                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 986         case TYPE_COMPLEX:
 987                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 988         case TYPE_IMAGINARY:
 989                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 990         default:
 991                 return false;
 992         }
 993 }
 994
 995 /**
 996  * Returns true if the given type is an integer or float type.
 997  *
 998  * @param type  The type to check.
 999  * @return True if type is an integer or float type.
1000  */
1001 bool is_type_real(const type_t *type)
1002 {
1003         /* 6.2.5 (17) */
1004         return is_type_integer(type) || is_type_float(type);
1005 }
1006
1007 /**
1008  * Returns true if the given type represents a scalar type.
1009  *
1010  * @param type  The type to check.
1011  * @return True if type represents a scalar type.
1012  */
1013 bool is_type_scalar(const type_t *type)
1014 {
1015         assert(!is_typeref(type));
1016
1017         switch (type->kind) {
1018                 case TYPE_POINTER: return true;
1019                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1020                 default:           break;
1021         }
1022
1023         return is_type_arithmetic(type);
1024 }
1025
1026 /**
1027  * Check if a given type is incomplete.
1028  *
1029  * @param type  The type to check.
1030  * @return True if the given type is incomplete (ie. just forward).
1031  */
1032 bool is_type_incomplete(const type_t *type)
1033 {
1034         assert(!is_typeref(type));
1035
1036         switch(type->kind) {
1037         case TYPE_COMPOUND_STRUCT:
1038         case TYPE_COMPOUND_UNION: {
1039                 const compound_type_t *compound_type = &type->compound;
1040                 return !compound_type->compound->complete;
1041         }
1042         case TYPE_ENUM:
1043                 return false;
1044
1045         case TYPE_ARRAY:
1046                 return type->array.size_expression == NULL
1047                         && !type->array.size_constant;
1048
1049         case TYPE_ATOMIC:
1050                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1051
1052         case TYPE_COMPLEX:
1053                 return type->complex.akind == ATOMIC_TYPE_VOID;
1054
1055         case TYPE_IMAGINARY:
1056                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1057
1058         case TYPE_BITFIELD:
1059         case TYPE_FUNCTION:
1060         case TYPE_POINTER:
1061         case TYPE_REFERENCE:
1062         case TYPE_BUILTIN:
1063         case TYPE_ERROR:
1064                 return false;
1065
1066         case TYPE_TYPEDEF:
1067         case TYPE_TYPEOF:
1068                 panic("is_type_incomplete called without typerefs skipped");
1069         case TYPE_INVALID:
1070                 break;
1071         }
1072
1073         panic("invalid type found");
1074 }
1075
1076 bool is_type_object(const type_t *type)
1077 {
1078         return !is_type_function(type) && !is_type_incomplete(type);
1079 }
1080
1081 /**
1082  * Check if two function types are compatible.
1083  */
1084 static bool function_types_compatible(const function_type_t *func1,
1085                                       const function_type_t *func2)
1086 {
1087         const type_t* const ret1 = skip_typeref(func1->return_type);
1088         const type_t* const ret2 = skip_typeref(func2->return_type);
1089         if (!types_compatible(ret1, ret2))
1090                 return false;
1091
1092         if (func1->linkage != func2->linkage)
1093                 return false;
1094
1095         if (func1->calling_convention != func2->calling_convention)
1096                 return false;
1097
1098         /* can parameters be compared? */
1099         if (func1->unspecified_parameters || func2->unspecified_parameters)
1100                 return true;
1101
1102         if (func1->variadic != func2->variadic)
1103                 return false;
1104
1105         /* TODO: handling of unspecified parameters not correct yet */
1106
1107         /* all argument types must be compatible */
1108         function_parameter_t *parameter1 = func1->parameters;
1109         function_parameter_t *parameter2 = func2->parameters;
1110         for ( ; parameter1 != NULL && parameter2 != NULL;
1111                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1112                 type_t *parameter1_type = skip_typeref(parameter1->type);
1113                 type_t *parameter2_type = skip_typeref(parameter2->type);
1114
1115                 parameter1_type = get_unqualified_type(parameter1_type);
1116                 parameter2_type = get_unqualified_type(parameter2_type);
1117
1118                 if (!types_compatible(parameter1_type, parameter2_type))
1119                         return false;
1120         }
1121         /* same number of arguments? */
1122         if (parameter1 != NULL || parameter2 != NULL)
1123                 return false;
1124
1125         return true;
1126 }
1127
1128 /**
1129  * Check if two array types are compatible.
1130  */
1131 static bool array_types_compatible(const array_type_t *array1,
1132                                    const array_type_t *array2)
1133 {
1134         type_t *element_type1 = skip_typeref(array1->element_type);
1135         type_t *element_type2 = skip_typeref(array2->element_type);
1136         if (!types_compatible(element_type1, element_type2))
1137                 return false;
1138
1139         if (!array1->size_constant || !array2->size_constant)
1140                 return true;
1141
1142         return array1->size == array2->size;
1143 }
1144
1145 /**
1146  * Check if two types are compatible.
1147  */
1148 bool types_compatible(const type_t *type1, const type_t *type2)
1149 {
1150         assert(!is_typeref(type1));
1151         assert(!is_typeref(type2));
1152
1153         /* shortcut: the same type is always compatible */
1154         if (type1 == type2)
1155                 return true;
1156
1157         if (!is_type_valid(type1) || !is_type_valid(type2))
1158                 return true;
1159
1160         if (type1->base.qualifiers != type2->base.qualifiers)
1161                 return false;
1162         if (type1->kind != type2->kind)
1163                 return false;
1164
1165         switch (type1->kind) {
1166         case TYPE_FUNCTION:
1167                 return function_types_compatible(&type1->function, &type2->function);
1168         case TYPE_ATOMIC:
1169                 return type1->atomic.akind == type2->atomic.akind;
1170         case TYPE_COMPLEX:
1171                 return type1->complex.akind == type2->complex.akind;
1172         case TYPE_IMAGINARY:
1173                 return type1->imaginary.akind == type2->imaginary.akind;
1174         case TYPE_ARRAY:
1175                 return array_types_compatible(&type1->array, &type2->array);
1176
1177         case TYPE_POINTER: {
1178                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1179                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1180                 return types_compatible(to1, to2);
1181         }
1182
1183         case TYPE_REFERENCE: {
1184                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1185                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1186                 return types_compatible(to1, to2);
1187         }
1188
1189         case TYPE_COMPOUND_STRUCT:
1190         case TYPE_COMPOUND_UNION:
1191         case TYPE_ENUM:
1192         case TYPE_BUILTIN:
1193                 /* TODO: not implemented */
1194                 break;
1195
1196         case TYPE_BITFIELD:
1197                 /* not sure if this makes sense or is even needed, implement it if you
1198                  * really need it! */
1199                 panic("type compatibility check for bitfield type");
1200
1201         case TYPE_ERROR:
1202                 /* Hmm, the error type should be compatible to all other types */
1203                 return true;
1204         case TYPE_INVALID:
1205                 panic("invalid type found in compatible types");
1206         case TYPE_TYPEDEF:
1207         case TYPE_TYPEOF:
1208                 panic("typerefs not skipped in compatible types?!?");
1209         }
1210
1211         /* TODO: incomplete */
1212         return false;
1213 }
1214
1215 /**
1216  * Skip all typerefs and return the underlying type.
1217  */
1218 type_t *skip_typeref(type_t *type)
1219 {
1220         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1221         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1222
1223         while (true) {
1224                 switch (type->kind) {
1225                 case TYPE_ERROR:
1226                         return type;
1227                 case TYPE_TYPEDEF: {
1228                         qualifiers |= type->base.qualifiers;
1229                         modifiers  |= type->base.modifiers;
1230                         const typedef_type_t *typedef_type = &type->typedeft;
1231                         if (typedef_type->resolved_type != NULL) {
1232                                 type = typedef_type->resolved_type;
1233                                 break;
1234                         }
1235                         type = typedef_type->typedefe->type;
1236                         continue;
1237                 }
1238                 case TYPE_TYPEOF: {
1239                         const typeof_type_t *typeof_type = &type->typeoft;
1240                         if (typeof_type->typeof_type != NULL) {
1241                                 type = typeof_type->typeof_type;
1242                         } else {
1243                                 type = typeof_type->expression->base.type;
1244                         }
1245                         continue;
1246                 }
1247                 default:
1248                         break;
1249                 }
1250                 break;
1251         }
1252
1253         if (qualifiers != TYPE_QUALIFIER_NONE || modifiers != TYPE_MODIFIER_NONE) {
1254                 type_t *const copy = duplicate_type(type);
1255
1256                 /* for const with typedefed array type the element type has to be
1257                  * adjusted */
1258                 if (is_type_array(copy)) {
1259                         type_t *element_type           = copy->array.element_type;
1260                         element_type                   = duplicate_type(element_type);
1261                         element_type->base.qualifiers |= qualifiers;
1262                         element_type->base.modifiers  |= modifiers;
1263                         copy->array.element_type       = element_type;
1264                 } else {
1265                         copy->base.qualifiers |= qualifiers;
1266                         copy->base.modifiers  |= modifiers;
1267                 }
1268
1269                 type = typehash_insert(copy);
1270                 if (type != copy) {
1271                         obstack_free(type_obst, copy);
1272                 }
1273         }
1274
1275         return type;
1276 }
1277
1278 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type) {
1279         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1280
1281         while (true) {
1282                 switch (type->base.kind) {
1283                 case TYPE_ERROR:
1284                         return TYPE_QUALIFIER_NONE;
1285                 case TYPE_TYPEDEF:
1286                         qualifiers |= type->base.qualifiers;
1287                         const typedef_type_t *typedef_type = &type->typedeft;
1288                         if (typedef_type->resolved_type != NULL)
1289                                 type = typedef_type->resolved_type;
1290                         else
1291                                 type = typedef_type->typedefe->type;
1292                         continue;
1293                 case TYPE_TYPEOF: {
1294                         const typeof_type_t *typeof_type = &type->typeoft;
1295                         if (typeof_type->typeof_type != NULL) {
1296                                 type = typeof_type->typeof_type;
1297                         } else {
1298                                 type = typeof_type->expression->base.type;
1299                         }
1300                         continue;
1301                 }
1302                 case TYPE_ARRAY:
1303                         if (skip_array_type) {
1304                                 type = type->array.element_type;
1305                                 continue;
1306                         }
1307                         break;
1308                 default:
1309                         break;
1310                 }
1311                 break;
1312         }
1313         return type->base.qualifiers | qualifiers;
1314 }
1315
1316 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1317 {
1318         assert(kind <= ATOMIC_TYPE_LAST);
1319         return atomic_type_properties[kind].size;
1320 }
1321
1322 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1323 {
1324         assert(kind <= ATOMIC_TYPE_LAST);
1325         return atomic_type_properties[kind].alignment;
1326 }
1327
1328 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1329 {
1330         assert(kind <= ATOMIC_TYPE_LAST);
1331         return atomic_type_properties[kind].flags;
1332 }
1333
1334 atomic_type_kind_t get_intptr_kind(void)
1335 {
1336         if (machine_size <= 32)
1337                 return ATOMIC_TYPE_INT;
1338         else if (machine_size <= 64)
1339                 return ATOMIC_TYPE_LONG;
1340         else
1341                 return ATOMIC_TYPE_LONGLONG;
1342 }
1343
1344 atomic_type_kind_t get_uintptr_kind(void)
1345 {
1346         if (machine_size <= 32)
1347                 return ATOMIC_TYPE_UINT;
1348         else if (machine_size <= 64)
1349                 return ATOMIC_TYPE_ULONG;
1350         else
1351                 return ATOMIC_TYPE_ULONGLONG;
1352 }
1353
1354 /**
1355  * Find the atomic type kind representing a given size (signed).
1356  */
1357 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1358         static atomic_type_kind_t kinds[32];
1359
1360         assert(size < 32);
1361         atomic_type_kind_t kind = kinds[size];
1362         if (kind == ATOMIC_TYPE_INVALID) {
1363                 static const atomic_type_kind_t possible_kinds[] = {
1364                         ATOMIC_TYPE_SCHAR,
1365                         ATOMIC_TYPE_SHORT,
1366                         ATOMIC_TYPE_INT,
1367                         ATOMIC_TYPE_LONG,
1368                         ATOMIC_TYPE_LONGLONG
1369                 };
1370                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1371                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1372                                 kind = possible_kinds[i];
1373                                 break;
1374                         }
1375                 }
1376                 kinds[size] = kind;
1377         }
1378         return kind;
1379 }
1380
1381 /**
1382  * Find the atomic type kind representing a given size (signed).
1383  */
1384 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1385         static atomic_type_kind_t kinds[32];
1386
1387         assert(size < 32);
1388         atomic_type_kind_t kind = kinds[size];
1389         if (kind == ATOMIC_TYPE_INVALID) {
1390                 static const atomic_type_kind_t possible_kinds[] = {
1391                         ATOMIC_TYPE_UCHAR,
1392                         ATOMIC_TYPE_USHORT,
1393                         ATOMIC_TYPE_UINT,
1394                         ATOMIC_TYPE_ULONG,
1395                         ATOMIC_TYPE_ULONGLONG
1396                 };
1397                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1398                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1399                                 kind = possible_kinds[i];
1400                                 break;
1401                         }
1402                 }
1403                 kinds[size] = kind;
1404         }
1405         return kind;
1406 }
1407
1408 /**
1409  * Hash the given type and return the "singleton" version
1410  * of it.
1411  */
1412 static type_t *identify_new_type(type_t *type)
1413 {
1414         type_t *result = typehash_insert(type);
1415         if (result != type) {
1416                 obstack_free(type_obst, type);
1417         }
1418         return result;
1419 }
1420
1421 /**
1422  * Creates a new atomic type.
1423  *
1424  * @param akind       The kind of the atomic type.
1425  * @param qualifiers  Type qualifiers for the new type.
1426  */
1427 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1428 {
1429         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1430         memset(type, 0, sizeof(atomic_type_t));
1431
1432         type->kind            = TYPE_ATOMIC;
1433         type->base.size       = get_atomic_type_size(akind);
1434         type->base.alignment  = get_atomic_type_alignment(akind);
1435         type->base.qualifiers = qualifiers;
1436         type->atomic.akind    = akind;
1437
1438         return identify_new_type(type);
1439 }
1440
1441 /**
1442  * Creates a new complex type.
1443  *
1444  * @param akind       The kind of the atomic type.
1445  * @param qualifiers  Type qualifiers for the new type.
1446  */
1447 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1448 {
1449         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1450         memset(type, 0, sizeof(complex_type_t));
1451
1452         type->kind            = TYPE_COMPLEX;
1453         type->base.qualifiers = qualifiers;
1454         type->base.alignment  = get_atomic_type_alignment(akind);
1455         type->complex.akind   = akind;
1456
1457         return identify_new_type(type);
1458 }
1459
1460 /**
1461  * Creates a new imaginary type.
1462  *
1463  * @param akind       The kind of the atomic type.
1464  * @param qualifiers  Type qualifiers for the new type.
1465  */
1466 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1467 {
1468         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1469         memset(type, 0, sizeof(imaginary_type_t));
1470
1471         type->kind            = TYPE_IMAGINARY;
1472         type->base.qualifiers = qualifiers;
1473         type->base.alignment  = get_atomic_type_alignment(akind);
1474         type->imaginary.akind = akind;
1475
1476         return identify_new_type(type);
1477 }
1478
1479 /**
1480  * Creates a new pointer type.
1481  *
1482  * @param points_to   The points-to type for the new type.
1483  * @param qualifiers  Type qualifiers for the new type.
1484  */
1485 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1486 {
1487         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1488         memset(type, 0, sizeof(pointer_type_t));
1489
1490         type->kind                  = TYPE_POINTER;
1491         type->base.qualifiers       = qualifiers;
1492         type->base.alignment        = 0;
1493         type->pointer.points_to     = points_to;
1494         type->pointer.base_variable = NULL;
1495
1496         return identify_new_type(type);
1497 }
1498
1499 /**
1500  * Creates a new reference type.
1501  *
1502  * @param refers_to   The referred-to type for the new type.
1503  */
1504 type_t *make_reference_type(type_t *refers_to)
1505 {
1506         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1507         memset(type, 0, sizeof(reference_type_t));
1508
1509         type->kind                = TYPE_REFERENCE;
1510         type->base.qualifiers     = 0;
1511         type->base.alignment      = 0;
1512         type->reference.refers_to = refers_to;
1513
1514         return identify_new_type(type);
1515 }
1516
1517 /**
1518  * Creates a new based pointer type.
1519  *
1520  * @param points_to   The points-to type for the new type.
1521  * @param qualifiers  Type qualifiers for the new type.
1522  * @param variable    The based variable
1523  */
1524 type_t *make_based_pointer_type(type_t *points_to,
1525                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1526 {
1527         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1528         memset(type, 0, sizeof(pointer_type_t));
1529
1530         type->kind                  = TYPE_POINTER;
1531         type->base.qualifiers       = qualifiers;
1532         type->base.alignment        = 0;
1533         type->pointer.points_to     = points_to;
1534         type->pointer.base_variable = variable;
1535
1536         return identify_new_type(type);
1537 }
1538
1539
1540 type_t *make_array_type(type_t *element_type, size_t size,
1541                         type_qualifiers_t qualifiers)
1542 {
1543         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1544         memset(type, 0, sizeof(array_type_t));
1545
1546         type->kind                = TYPE_ARRAY;
1547         type->base.qualifiers     = qualifiers;
1548         type->base.alignment      = 0;
1549         type->array.element_type  = element_type;
1550         type->array.size          = size;
1551         type->array.size_constant = true;
1552
1553         return identify_new_type(type);
1554 }
1555
1556 /**
1557  * Debug helper. Prints the given type to stdout.
1558  */
1559 static __attribute__((unused))
1560 void dbg_type(const type_t *type)
1561 {
1562         FILE *old_out = out;
1563         out = stderr;
1564         print_type(type);
1565         puts("\n");
1566         fflush(stderr);
1567         out = old_out;
1568 }