nsz Git - cparser/blob - type.c

   1 #include <config.h>
   2
   3 #include <stdio.h>
   4 #include <assert.h>
   5 #include "type_t.h"
   6 #include "type_hash.h"
   7 #include "adt/error.h"
   8
   9 static struct obstack   _type_obst;
  10 struct obstack         *type_obst = &_type_obst;
  11 static FILE            *out;
  12 static int              type_visited = 0;
  13
  14 static void intern_print_type_pre(const type_t *type, bool top);
  15 static void intern_print_type_post(const type_t *type, bool top);
  16
  17 void init_types(void)
  18 {
  19         obstack_init(type_obst);
  20 }
  21
  22 void exit_types(void)
  23 {
  24         obstack_free(type_obst, NULL);
  25 }
  26
  27 void type_set_output(FILE *stream)
  28 {
  29         out = stream;
  30 }
  31
  32 void inc_type_visited(void)
  33 {
  34         type_visited++;
  35 }
  36
  37 void print_type_qualifiers(type_qualifiers_t qualifiers)
  38 {
  39         if(qualifiers & TYPE_QUALIFIER_CONST)    fputs("const ",    out);
  40         if(qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out);
  41         if(qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out);
  42 }
  43
  44 static
  45 void print_atomic_type(const atomic_type_t *type)
  46 {
  47         print_type_qualifiers(type->type.qualifiers);
  48
  49         const char *s;
  50         switch(type->atype) {
  51         case ATOMIC_TYPE_INVALID:     s = "INVALIDATOMIC";      break;
  52         case ATOMIC_TYPE_VOID:        s = "void";               break;
  53         case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
  54         case ATOMIC_TYPE_CHAR:        s = "char";               break;
  55         case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
  56         case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
  57         case ATOMIC_TYPE_INT:         s = "int";                break;
  58         case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
  59         case ATOMIC_TYPE_SHORT:       s = "short";              break;
  60         case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
  61         case ATOMIC_TYPE_LONG:        s = "long";               break;
  62         case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
  63         case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
  64         case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
  65         case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
  66         case ATOMIC_TYPE_FLOAT:       s = "float";              break;
  67         case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
  68         default:                      s = "UNKNOWNATOMIC";      break;
  69         }
  70         fputs(s, out);
  71 }
  72
  73 static void print_function_type_pre(const function_type_t *type, bool top)
  74 {
  75         print_type_qualifiers(type->type.qualifiers);
  76
  77         intern_print_type_pre(type->return_type, false);
  78
  79         /* don't emit braces if we're the toplevel type... */
  80         if(!top)
  81                 fputc('(', out);
  82 }
  83
  84 static void print_function_type_post(const function_type_t *type,
  85                                      const context_t *context, bool top)
  86 {
  87         intern_print_type_post(type->return_type, false);
  88         /* don't emit braces if we're the toplevel type... */
  89         if(!top)
  90                 fputc(')', out);
  91
  92         fputc('(', out);
  93
  94         int                 first     = 1;
  95         if(context == NULL) {
  96                 function_parameter_t *parameter = type->parameters;
  97                 for( ; parameter != NULL; parameter = parameter->next) {
  98                         if(first) {
  99                                 first = 0;
 100                         } else {
 101                                 fputs(", ", out);
 102                         }
 103                         print_type(parameter->type);
 104                 }
 105         } else {
 106                 declaration_t *parameter = context->declarations;
 107                 for( ; parameter != NULL; parameter = parameter->next) {
 108                         if(first) {
 109                                 first = 0;
 110                         } else {
 111                                 fputs(", ", out);
 112                         }
 113                         print_type_ext(parameter->type, parameter->symbol,
 114                                        &parameter->context);
 115                 }
 116         }
 117         if(type->variadic) {
 118                 if(first) {
 119                         first = 0;
 120                 } else {
 121                         fputs(", ", out);
 122                 }
 123                 fputs("...", out);
 124         }
 125         if(first && !type->unspecified_parameters) {
 126                 fputs("void", out);
 127         }
 128         fputc(')', out);
 129 }
 130
 131 static void print_pointer_type_pre(const pointer_type_t *type)
 132 {
 133         intern_print_type_pre(type->points_to, false);
 134         fputs("*", out);
 135         print_type_qualifiers(type->type.qualifiers);
 136 }
 137
 138 static void print_pointer_type_post(const pointer_type_t *type)
 139 {
 140         intern_print_type_post(type->points_to, false);
 141 }
 142
 143 static void print_array_type_pre(const array_type_t *type)
 144 {
 145         intern_print_type_pre(type->element_type, false);
 146 }
 147
 148 static void print_array_type_post(const array_type_t *type)
 149 {
 150         fputc('[', out);
 151         if(type->is_static) {
 152                 fputs("static ", out);
 153         }
 154         print_type_qualifiers(type->type.qualifiers);
 155         if(type->size != NULL) {
 156                 print_expression(type->size);
 157         }
 158         fputc(']', out);
 159         intern_print_type_post(type->element_type, false);
 160 }
 161
 162 static void print_bitfield_type_post(const bitfield_type_t *type)
 163 {
 164         fputs(" : ", out);
 165         print_expression(type->size);
 166         intern_print_type_post(type->base, false);
 167 }
 168
 169 void print_enum_definition(const declaration_t *declaration)
 170 {
 171         fputs("{\n", out);
 172
 173         change_indent(1);
 174
 175         declaration_t *entry = declaration->next;
 176         for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
 177                entry = entry->next) {
 178
 179                 print_indent();
 180                 fprintf(out, "%s", entry->symbol->string);
 181                 if(entry->init.initializer != NULL) {
 182                         fprintf(out, " = ");
 183                         print_expression(entry->init.enum_value);
 184                 }
 185                 fprintf(out, ",\n");
 186         }
 187
 188         change_indent(-1);
 189         print_indent();
 190         fputs("}", out);
 191 }
 192
 193 static void print_type_enum(const enum_type_t *type)
 194 {
 195         print_type_qualifiers(type->type.qualifiers);
 196         fputs("enum ", out);
 197
 198         declaration_t *declaration = type->declaration;
 199         symbol_t      *symbol      = declaration->symbol;
 200         if(symbol != NULL) {
 201                 fputs(symbol->string, out);
 202         } else {
 203                 print_enum_definition(declaration);
 204         }
 205 }
 206
 207 void print_compound_definition(const declaration_t *declaration)
 208 {
 209         fputs("{\n", out);
 210         change_indent(1);
 211
 212         declaration_t *iter = declaration->context.declarations;
 213         for( ; iter != NULL; iter = iter->next) {
 214                 print_indent();
 215                 print_declaration(iter);
 216                 fputc('\n', out);
 217         }
 218
 219         change_indent(-1);
 220         print_indent();
 221         fputs("}", out);
 222 }
 223
 224 static void print_compound_type(const compound_type_t *type)
 225 {
 226         print_type_qualifiers(type->type.qualifiers);
 227
 228         if(type->type.kind == TYPE_COMPOUND_STRUCT) {
 229                 fputs("struct ", out);
 230         } else {
 231                 assert(type->type.kind == TYPE_COMPOUND_UNION);
 232                 fputs("union ", out);
 233         }
 234
 235         declaration_t *declaration = type->declaration;
 236         symbol_t      *symbol      = declaration->symbol;
 237         if(symbol != NULL) {
 238                 fputs(symbol->string, out);
 239         } else {
 240                 print_compound_definition(declaration);
 241         }
 242 }
 243
 244 static void print_typedef_type_pre(const typedef_type_t *const type)
 245 {
 246         print_type_qualifiers(type->type.qualifiers);
 247         fputs(type->declaration->symbol->string, out);
 248 }
 249
 250 static void print_typeof_type_pre(const typeof_type_t *const type)
 251 {
 252         fputs("typeof(", out);
 253         if(type->expression != NULL) {
 254                 assert(type->typeof_type == NULL);
 255                 print_expression(type->expression);
 256         } else {
 257                 print_type(type->typeof_type);
 258         }
 259         fputc(')', out);
 260 }
 261
 262 static void intern_print_type_pre(const type_t *const type, const bool top)
 263 {
 264         switch(type->kind) {
 265         case TYPE_INVALID:
 266                 fputs("invalid", out);
 267                 return;
 268         case TYPE_ENUM:
 269                 print_type_enum(&type->enumt);
 270                 return;
 271         case TYPE_ATOMIC:
 272                 print_atomic_type(&type->atomic);
 273                 return;
 274         case TYPE_COMPOUND_STRUCT:
 275         case TYPE_COMPOUND_UNION:
 276                 print_compound_type(&type->compound);
 277                 return;
 278         case TYPE_BUILTIN:
 279                 fputs(type->builtin.symbol->string, out);
 280                 return;
 281         case TYPE_FUNCTION:
 282                 print_function_type_pre(&type->function, top);
 283                 return;
 284         case TYPE_POINTER:
 285                 print_pointer_type_pre(&type->pointer);
 286                 return;
 287         case TYPE_BITFIELD:
 288                 intern_print_type_pre(type->bitfield.base, top);
 289                 return;
 290         case TYPE_ARRAY:
 291                 print_array_type_pre(&type->array);
 292                 return;
 293         case TYPE_TYPEDEF:
 294                 print_typedef_type_pre(&type->typedeft);
 295                 return;
 296         case TYPE_TYPEOF:
 297                 print_typeof_type_pre(&type->typeoft);
 298                 return;
 299         }
 300         fputs("unknown", out);
 301 }
 302
 303 static void intern_print_type_post(const type_t *const type, const bool top)
 304 {
 305         switch(type->kind) {
 306         case TYPE_FUNCTION:
 307                 print_function_type_post(&type->function, NULL, top);
 308                 return;
 309         case TYPE_POINTER:
 310                 print_pointer_type_post(&type->pointer);
 311                 return;
 312         case TYPE_ARRAY:
 313                 print_array_type_post(&type->array);
 314                 return;
 315         case TYPE_BITFIELD:
 316                 print_bitfield_type_post(&type->bitfield);
 317                 return;
 318         case TYPE_INVALID:
 319         case TYPE_ATOMIC:
 320         case TYPE_ENUM:
 321         case TYPE_COMPOUND_STRUCT:
 322         case TYPE_COMPOUND_UNION:
 323         case TYPE_BUILTIN:
 324         case TYPE_TYPEOF:
 325         case TYPE_TYPEDEF:
 326                 break;
 327         }
 328 }
 329
 330 void print_type(const type_t *const type)
 331 {
 332         print_type_ext(type, NULL, NULL);
 333 }
 334
 335 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 336                     const context_t *context)
 337 {
 338         if(type == NULL) {
 339                 fputs("nil type", out);
 340                 return;
 341         }
 342
 343         intern_print_type_pre(type, true);
 344         if(symbol != NULL) {
 345                 fputc(' ', out);
 346                 fputs(symbol->string, out);
 347         }
 348         if(type->kind == TYPE_FUNCTION) {
 349                 print_function_type_post(&type->function, context, true);
 350         } else {
 351                 intern_print_type_post(type, true);
 352         }
 353 }
 354
 355 static size_t get_type_size(type_t *type)
 356 {
 357         switch(type->kind) {
 358         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 359         case TYPE_COMPOUND_STRUCT:
 360         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 361         case TYPE_ENUM:            return sizeof(enum_type_t);
 362         case TYPE_FUNCTION:        return sizeof(function_type_t);
 363         case TYPE_POINTER:         return sizeof(pointer_type_t);
 364         case TYPE_ARRAY:           return sizeof(array_type_t);
 365         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 366         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 367         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 368         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 369         case TYPE_INVALID:         panic("invalid type found");
 370         }
 371         panic("unknown type found");
 372 }
 373
 374 /**
 375  * duplicates a type
 376  * note that this does not produce a deep copy!
 377  */
 378 type_t *duplicate_type(type_t *type)
 379 {
 380         size_t size = get_type_size(type);
 381
 382         type_t *copy = obstack_alloc(type_obst, size);
 383         memcpy(copy, type, size);
 384
 385         return copy;
 386 }
 387
 388 type_t *get_unqualified_type(type_t *type)
 389 {
 390         if(type->base.qualifiers == TYPE_QUALIFIER_NONE)
 391                 return type;
 392
 393         type_t *unqualified_type          = duplicate_type(type);
 394         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 395
 396         type_t *result = typehash_insert(unqualified_type);
 397         if(result != unqualified_type) {
 398                 obstack_free(type_obst, unqualified_type);
 399         }
 400
 401         return result;
 402 }
 403
 404 bool type_valid(const type_t *type)
 405 {
 406         return type->kind != TYPE_INVALID;
 407 }
 408
 409 bool is_type_integer(const type_t *type)
 410 {
 411         assert(!is_typeref(type));
 412
 413         if(type->kind == TYPE_ENUM)
 414                 return true;
 415
 416         if(type->kind != TYPE_ATOMIC)
 417                 return false;
 418
 419         switch(type->atomic.atype) {
 420         case ATOMIC_TYPE_BOOL:
 421         case ATOMIC_TYPE_CHAR:
 422         case ATOMIC_TYPE_SCHAR:
 423         case ATOMIC_TYPE_UCHAR:
 424         case ATOMIC_TYPE_SHORT:
 425         case ATOMIC_TYPE_USHORT:
 426         case ATOMIC_TYPE_INT:
 427         case ATOMIC_TYPE_UINT:
 428         case ATOMIC_TYPE_LONG:
 429         case ATOMIC_TYPE_ULONG:
 430         case ATOMIC_TYPE_LONGLONG:
 431         case ATOMIC_TYPE_ULONGLONG:
 432                 return true;
 433         default:
 434                 return false;
 435         }
 436 }
 437
 438 bool is_type_floating(const type_t *type)
 439 {
 440         assert(!is_typeref(type));
 441
 442         if(type->kind != TYPE_ATOMIC)
 443                 return false;
 444
 445         switch(type->atomic.atype) {
 446         case ATOMIC_TYPE_FLOAT:
 447         case ATOMIC_TYPE_DOUBLE:
 448         case ATOMIC_TYPE_LONG_DOUBLE:
 449 #ifdef PROVIDE_COMPLEX
 450         case ATOMIC_TYPE_FLOAT_COMPLEX:
 451         case ATOMIC_TYPE_DOUBLE_COMPLEX:
 452         case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
 453         case ATOMIC_TYPE_FLOAT_IMAGINARY:
 454         case ATOMIC_TYPE_DOUBLE_IMAGINARY:
 455         case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
 456 #endif
 457                 return true;
 458         default:
 459                 return false;
 460         }
 461 }
 462
 463 bool is_type_signed(const type_t *type)
 464 {
 465         assert(!is_typeref(type));
 466
 467         /* enum types are int for now */
 468         if(type->kind == TYPE_ENUM)
 469                 return true;
 470
 471         if(type->kind != TYPE_ATOMIC)
 472                 return false;
 473
 474         switch(type->atomic.atype) {
 475         case ATOMIC_TYPE_CHAR:
 476         case ATOMIC_TYPE_SCHAR:
 477         case ATOMIC_TYPE_SHORT:
 478         case ATOMIC_TYPE_INT:
 479         case ATOMIC_TYPE_LONG:
 480         case ATOMIC_TYPE_LONGLONG:
 481         case ATOMIC_TYPE_FLOAT:
 482         case ATOMIC_TYPE_DOUBLE:
 483         case ATOMIC_TYPE_LONG_DOUBLE:
 484 #ifdef PROVIDE_COMPLEX
 485         case ATOMIC_TYPE_FLOAT_COMPLEX:
 486         case ATOMIC_TYPE_DOUBLE_COMPLEX:
 487         case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
 488         case ATOMIC_TYPE_FLOAT_IMAGINARY:
 489         case ATOMIC_TYPE_DOUBLE_IMAGINARY:
 490         case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
 491 #endif
 492                 return true;
 493
 494         case ATOMIC_TYPE_BOOL:
 495         case ATOMIC_TYPE_UCHAR:
 496         case ATOMIC_TYPE_USHORT:
 497         case ATOMIC_TYPE_UINT:
 498         case ATOMIC_TYPE_ULONG:
 499         case ATOMIC_TYPE_ULONGLONG:
 500                 return false;
 501
 502         case ATOMIC_TYPE_VOID:
 503         case ATOMIC_TYPE_INVALID:
 504         case ATOMIC_TYPE_LAST:
 505                 return false;
 506         }
 507
 508         panic("invalid atomic type found");
 509         return false;
 510 }
 511
 512 bool is_type_arithmetic(const type_t *type)
 513 {
 514         assert(!is_typeref(type));
 515
 516         if(type->kind == TYPE_BITFIELD)
 517                 return true;
 518
 519         if(is_type_integer(type) || is_type_floating(type))
 520                 return true;
 521
 522         return false;
 523 }
 524
 525 bool is_type_scalar(const type_t *type)
 526 {
 527         assert(!is_typeref(type));
 528
 529         switch (type->kind) {
 530                 case TYPE_POINTER: return true;
 531                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 532                 default:            break;
 533         }
 534
 535         return is_type_arithmetic(type);
 536 }
 537
 538 bool is_type_incomplete(const type_t *type)
 539 {
 540         assert(!is_typeref(type));
 541
 542         switch(type->kind) {
 543         case TYPE_COMPOUND_STRUCT:
 544         case TYPE_COMPOUND_UNION: {
 545                 const compound_type_t *compound_type = &type->compound;
 546                 declaration_t         *declaration   = compound_type->declaration;
 547                 return !declaration->init.is_defined;
 548         }
 549         case TYPE_BITFIELD:
 550         case TYPE_FUNCTION:
 551                 return true;
 552
 553         case TYPE_ARRAY:
 554                 return type->array.size == NULL;
 555
 556         case TYPE_ATOMIC:
 557                 return type->atomic.atype == ATOMIC_TYPE_VOID;
 558
 559         case TYPE_POINTER:
 560         case TYPE_ENUM:
 561         case TYPE_BUILTIN:
 562                 return false;
 563
 564         case TYPE_TYPEDEF:
 565         case TYPE_TYPEOF:
 566                 panic("is_type_incomplete called without typerefs skipped");
 567         case TYPE_INVALID:
 568                 break;
 569         }
 570
 571         panic("invalid type found");
 572 }
 573
 574 static bool function_types_compatible(const function_type_t *func1,
 575                                       const function_type_t *func2)
 576 {
 577         const type_t* const ret1 = skip_typeref(func1->return_type);
 578         const type_t* const ret2 = skip_typeref(func2->return_type);
 579         if (!types_compatible(ret1, ret2))
 580                 return false;
 581
 582         /* can parameters be compared? */
 583         if(func1->unspecified_parameters || func2->unspecified_parameters)
 584                 return true;
 585
 586         if(func1->variadic != func2->variadic)
 587                 return false;
 588
 589         /* TODO: handling of unspecified parameters not correct yet */
 590
 591         /* all argument types must be compatible */
 592         function_parameter_t *parameter1 = func1->parameters;
 593         function_parameter_t *parameter2 = func2->parameters;
 594         for( ; parameter1 != NULL && parameter2 != NULL;
 595                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 596                 type_t *parameter1_type = skip_typeref(parameter1->type);
 597                 type_t *parameter2_type = skip_typeref(parameter2->type);
 598
 599                 parameter1_type = get_unqualified_type(parameter1_type);
 600                 parameter2_type = get_unqualified_type(parameter2_type);
 601
 602                 if(!types_compatible(parameter1_type, parameter2_type))
 603                         return false;
 604         }
 605         /* same number of arguments? */
 606         if(parameter1 != NULL || parameter2 != NULL)
 607                 return false;
 608
 609         return true;
 610 }
 611
 612 static bool array_types_compatible(const array_type_t *array1,
 613                                    const array_type_t *array2)
 614 {
 615         type_t *element_type1 = skip_typeref(array1->element_type);
 616         type_t *element_type2 = skip_typeref(array2->element_type);
 617         if(!types_compatible(element_type1, element_type2))
 618                 return false;
 619
 620         if(array1->size != NULL && array2->size != NULL) {
 621                 /* TODO: check if size expression evaluate to the same value
 622                  * if they are constant */
 623         }
 624
 625         return true;
 626 }
 627
 628 bool types_compatible(const type_t *type1, const type_t *type2)
 629 {
 630         assert(!is_typeref(type1));
 631         assert(!is_typeref(type2));
 632
 633         /* shortcut: the same type is always compatible */
 634         if(type1 == type2)
 635                 return true;
 636
 637         if(type1->base.qualifiers != type2->base.qualifiers)
 638                 return false;
 639         if(type1->kind != type2->kind)
 640                 return false;
 641
 642         switch(type1->kind) {
 643         case TYPE_FUNCTION:
 644                 return function_types_compatible(&type1->function, &type2->function);
 645         case TYPE_ATOMIC:
 646                 return type1->atomic.atype == type2->atomic.atype;
 647         case TYPE_ARRAY:
 648                 return array_types_compatible(&type1->array, &type2->array);
 649
 650         case TYPE_POINTER: {
 651                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
 652                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
 653                 return types_compatible(to1, to2);
 654         }
 655
 656         case TYPE_COMPOUND_STRUCT:
 657         case TYPE_COMPOUND_UNION:
 658         case TYPE_ENUM:
 659         case TYPE_BUILTIN:
 660                 /* TODO: not implemented */
 661                 break;
 662
 663         case TYPE_BITFIELD:
 664                 /* not sure if this makes sense or is even needed, implement it if you
 665                  * really need it! */
 666                 panic("type compatibility check for bitfield type");
 667
 668         case TYPE_INVALID:
 669                 panic("invalid type found in compatible types");
 670         case TYPE_TYPEDEF:
 671         case TYPE_TYPEOF:
 672                 panic("typerefs not skipped in compatible types?!?");
 673         }
 674
 675         /* TODO: incomplete */
 676         return false;
 677 }
 678
 679 bool pointers_compatible(const type_t *type1, const type_t *type2)
 680 {
 681         assert(!is_typeref(type1));
 682         assert(!is_typeref(type2));
 683
 684         assert(type1->kind == TYPE_POINTER);
 685         assert(type2->kind == TYPE_POINTER);
 686         /* TODO */
 687         return true;
 688 }
 689
 690 type_t *skip_typeref(type_t *type)
 691 {
 692         unsigned qualifiers = type->base.qualifiers;
 693
 694         while(true) {
 695                 switch(type->kind) {
 696                 case TYPE_TYPEDEF: {
 697                         qualifiers |= type->base.qualifiers;
 698                         const typedef_type_t *typedef_type = &type->typedeft;
 699                         if(typedef_type->resolved_type != NULL) {
 700                                 type = typedef_type->resolved_type;
 701                                 break;
 702                         }
 703                         type = typedef_type->declaration->type;
 704                         continue;
 705                 }
 706                 case TYPE_TYPEOF: {
 707                         const typeof_type_t *typeof_type = &type->typeoft;
 708                         if(typeof_type->typeof_type != NULL) {
 709                                 type = typeof_type->typeof_type;
 710                         } else {
 711                                 type = typeof_type->expression->base.datatype;
 712                         }
 713                         continue;
 714                 }
 715                 default:
 716                         break;
 717                 }
 718                 break;
 719         }
 720
 721         return type;
 722 }
 723
 724
 725
 726 static type_t *identify_new_type(type_t *type)
 727 {
 728         type_t *result = typehash_insert(type);
 729         if(result != type) {
 730                 obstack_free(type_obst, type);
 731         }
 732         return result;
 733 }
 734
 735 type_t *make_atomic_type(atomic_type_type_t atype, type_qualifiers_t qualifiers)
 736 {
 737         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
 738         memset(type, 0, sizeof(atomic_type_t));
 739
 740         type->kind            = TYPE_ATOMIC;
 741         type->base.qualifiers = qualifiers;
 742         type->atomic.atype    = atype;
 743
 744         return identify_new_type(type);
 745 }
 746
 747 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
 748 {
 749         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
 750         memset(type, 0, sizeof(pointer_type_t));
 751
 752         type->kind              = TYPE_POINTER;
 753         type->base.qualifiers   = qualifiers;
 754         type->pointer.points_to = points_to;
 755
 756         return identify_new_type(type);
 757 }
 758
 759 static __attribute__((unused))
 760 void dbg_type(type_t *type)
 761 {
 762         FILE *old_out = out;
 763         out = stderr;
 764         print_type(type);
 765         puts("\n");
 766         fflush(stderr);
 767         out = old_out;
 768 }