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         fputs(type->declaration->symbol->string, out);
 247 }
 248
 249 static void print_typeof_type_pre(const typeof_type_t *const type)
 250 {
 251         fputs("typeof(", out);
 252         if(type->expression != NULL) {
 253                 assert(type->typeof_type == NULL);
 254                 print_expression(type->expression);
 255         } else {
 256                 print_type(type->typeof_type);
 257         }
 258         fputc(')', out);
 259 }
 260
 261 static void intern_print_type_pre(const type_t *const type, const bool top)
 262 {
 263         switch(type->kind) {
 264         case TYPE_INVALID:
 265                 fputs("invalid", out);
 266                 return;
 267         case TYPE_ENUM:
 268                 print_type_enum(&type->enumt);
 269                 return;
 270         case TYPE_ATOMIC:
 271                 print_atomic_type(&type->atomic);
 272                 return;
 273         case TYPE_COMPOUND_STRUCT:
 274         case TYPE_COMPOUND_UNION:
 275                 print_compound_type(&type->compound);
 276                 return;
 277         case TYPE_BUILTIN:
 278                 fputs(type->builtin.symbol->string, out);
 279                 return;
 280         case TYPE_FUNCTION:
 281                 print_function_type_pre(&type->function, top);
 282                 return;
 283         case TYPE_POINTER:
 284                 print_pointer_type_pre(&type->pointer);
 285                 return;
 286         case TYPE_BITFIELD:
 287                 intern_print_type_pre(type->bitfield.base, top);
 288                 return;
 289         case TYPE_ARRAY:
 290                 print_array_type_pre(&type->array);
 291                 return;
 292         case TYPE_TYPEDEF:
 293                 print_typedef_type_pre(&type->typedeft);
 294                 return;
 295         case TYPE_TYPEOF:
 296                 print_typeof_type_pre(&type->typeoft);
 297                 return;
 298         }
 299         fputs("unknown", out);
 300 }
 301
 302 static void intern_print_type_post(const type_t *const type, const bool top)
 303 {
 304         switch(type->kind) {
 305         case TYPE_FUNCTION:
 306                 print_function_type_post(&type->function, NULL, top);
 307                 return;
 308         case TYPE_POINTER:
 309                 print_pointer_type_post(&type->pointer);
 310                 return;
 311         case TYPE_ARRAY:
 312                 print_array_type_post(&type->array);
 313                 return;
 314         case TYPE_BITFIELD:
 315                 print_bitfield_type_post(&type->bitfield);
 316                 return;
 317         case TYPE_INVALID:
 318         case TYPE_ATOMIC:
 319         case TYPE_ENUM:
 320         case TYPE_COMPOUND_STRUCT:
 321         case TYPE_COMPOUND_UNION:
 322         case TYPE_BUILTIN:
 323         case TYPE_TYPEOF:
 324         case TYPE_TYPEDEF:
 325                 break;
 326         }
 327 }
 328
 329 void print_type(const type_t *const type)
 330 {
 331         print_type_ext(type, NULL, NULL);
 332 }
 333
 334 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 335                     const context_t *context)
 336 {
 337         if(type == NULL) {
 338                 fputs("nil type", out);
 339                 return;
 340         }
 341
 342         intern_print_type_pre(type, true);
 343         if(symbol != NULL) {
 344                 fputc(' ', out);
 345                 fputs(symbol->string, out);
 346         }
 347         if(type->kind == TYPE_FUNCTION) {
 348                 print_function_type_post(&type->function, context, true);
 349         } else {
 350                 intern_print_type_post(type, true);
 351         }
 352 }
 353
 354 static size_t get_type_size(type_t *type)
 355 {
 356         switch(type->kind) {
 357         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 358         case TYPE_COMPOUND_STRUCT:
 359         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 360         case TYPE_ENUM:            return sizeof(enum_type_t);
 361         case TYPE_FUNCTION:        return sizeof(function_type_t);
 362         case TYPE_POINTER:         return sizeof(pointer_type_t);
 363         case TYPE_ARRAY:           return sizeof(array_type_t);
 364         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 365         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 366         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 367         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 368         case TYPE_INVALID:         panic("invalid type found");
 369         }
 370         panic("unknown type found");
 371 }
 372
 373 /**
 374  * duplicates a type
 375  * note that this does not produce a deep copy!
 376  */
 377 type_t *duplicate_type(type_t *type)
 378 {
 379         size_t size = get_type_size(type);
 380
 381         type_t *copy = obstack_alloc(type_obst, size);
 382         memcpy(copy, type, size);
 383
 384         return copy;
 385 }
 386
 387 type_t *get_unqualified_type(type_t *type)
 388 {
 389         if(type->base.qualifiers == TYPE_QUALIFIER_NONE)
 390                 return type;
 391
 392         type_t *unqualified_type          = duplicate_type(type);
 393         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 394
 395         type_t *result = typehash_insert(unqualified_type);
 396         if(result != unqualified_type) {
 397                 obstack_free(type_obst, unqualified_type);
 398         }
 399
 400         return result;
 401 }
 402
 403 bool type_valid(const type_t *type)
 404 {
 405         return type->kind != TYPE_INVALID;
 406 }
 407
 408 bool is_type_integer(const type_t *type)
 409 {
 410         assert(!is_typeref(type));
 411
 412         if(type->kind == TYPE_ENUM)
 413                 return true;
 414
 415         if(type->kind != TYPE_ATOMIC)
 416                 return false;
 417
 418         switch(type->atomic.atype) {
 419         case ATOMIC_TYPE_BOOL:
 420         case ATOMIC_TYPE_CHAR:
 421         case ATOMIC_TYPE_SCHAR:
 422         case ATOMIC_TYPE_UCHAR:
 423         case ATOMIC_TYPE_SHORT:
 424         case ATOMIC_TYPE_USHORT:
 425         case ATOMIC_TYPE_INT:
 426         case ATOMIC_TYPE_UINT:
 427         case ATOMIC_TYPE_LONG:
 428         case ATOMIC_TYPE_ULONG:
 429         case ATOMIC_TYPE_LONGLONG:
 430         case ATOMIC_TYPE_ULONGLONG:
 431                 return true;
 432         default:
 433                 return false;
 434         }
 435 }
 436
 437 bool is_type_floating(const type_t *type)
 438 {
 439         assert(!is_typeref(type));
 440
 441         if(type->kind != TYPE_ATOMIC)
 442                 return false;
 443
 444         switch(type->atomic.atype) {
 445         case ATOMIC_TYPE_FLOAT:
 446         case ATOMIC_TYPE_DOUBLE:
 447         case ATOMIC_TYPE_LONG_DOUBLE:
 448 #ifdef PROVIDE_COMPLEX
 449         case ATOMIC_TYPE_FLOAT_COMPLEX:
 450         case ATOMIC_TYPE_DOUBLE_COMPLEX:
 451         case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
 452         case ATOMIC_TYPE_FLOAT_IMAGINARY:
 453         case ATOMIC_TYPE_DOUBLE_IMAGINARY:
 454         case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
 455 #endif
 456                 return true;
 457         default:
 458                 return false;
 459         }
 460 }
 461
 462 bool is_type_signed(const type_t *type)
 463 {
 464         assert(!is_typeref(type));
 465
 466         /* enum types are int for now */
 467         if(type->kind == TYPE_ENUM)
 468                 return true;
 469
 470         if(type->kind != TYPE_ATOMIC)
 471                 return false;
 472
 473         switch(type->atomic.atype) {
 474         case ATOMIC_TYPE_CHAR:
 475         case ATOMIC_TYPE_SCHAR:
 476         case ATOMIC_TYPE_SHORT:
 477         case ATOMIC_TYPE_INT:
 478         case ATOMIC_TYPE_LONG:
 479         case ATOMIC_TYPE_LONGLONG:
 480         case ATOMIC_TYPE_FLOAT:
 481         case ATOMIC_TYPE_DOUBLE:
 482         case ATOMIC_TYPE_LONG_DOUBLE:
 483 #ifdef PROVIDE_COMPLEX
 484         case ATOMIC_TYPE_FLOAT_COMPLEX:
 485         case ATOMIC_TYPE_DOUBLE_COMPLEX:
 486         case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
 487         case ATOMIC_TYPE_FLOAT_IMAGINARY:
 488         case ATOMIC_TYPE_DOUBLE_IMAGINARY:
 489         case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
 490 #endif
 491                 return true;
 492
 493         case ATOMIC_TYPE_BOOL:
 494         case ATOMIC_TYPE_UCHAR:
 495         case ATOMIC_TYPE_USHORT:
 496         case ATOMIC_TYPE_UINT:
 497         case ATOMIC_TYPE_ULONG:
 498         case ATOMIC_TYPE_ULONGLONG:
 499                 return false;
 500
 501         case ATOMIC_TYPE_VOID:
 502         case ATOMIC_TYPE_INVALID:
 503         case ATOMIC_TYPE_LAST:
 504                 return false;
 505         }
 506
 507         panic("invalid atomic type found");
 508         return false;
 509 }
 510
 511 bool is_type_arithmetic(const type_t *type)
 512 {
 513         assert(!is_typeref(type));
 514
 515         if(type->kind == TYPE_BITFIELD)
 516                 return true;
 517
 518         if(is_type_integer(type) || is_type_floating(type))
 519                 return true;
 520
 521         return false;
 522 }
 523
 524 bool is_type_scalar(const type_t *type)
 525 {
 526         assert(!is_typeref(type));
 527
 528         switch (type->kind) {
 529                 case TYPE_POINTER: return true;
 530                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 531                 default:            break;
 532         }
 533
 534         return is_type_arithmetic(type);
 535 }
 536
 537 bool is_type_incomplete(const type_t *type)
 538 {
 539         assert(!is_typeref(type));
 540
 541         switch(type->kind) {
 542         case TYPE_COMPOUND_STRUCT:
 543         case TYPE_COMPOUND_UNION: {
 544                 const compound_type_t *compound_type = &type->compound;
 545                 declaration_t         *declaration   = compound_type->declaration;
 546                 return !declaration->init.is_defined;
 547         }
 548         case TYPE_BITFIELD:
 549         case TYPE_FUNCTION:
 550                 return true;
 551
 552         case TYPE_ARRAY:
 553                 return type->array.size == NULL;
 554
 555         case TYPE_ATOMIC:
 556                 return type->atomic.atype == ATOMIC_TYPE_VOID;
 557
 558         case TYPE_POINTER:
 559         case TYPE_ENUM:
 560         case TYPE_BUILTIN:
 561                 return false;
 562
 563         case TYPE_TYPEDEF:
 564         case TYPE_TYPEOF:
 565                 panic("is_type_incomplete called without typerefs skipped");
 566         case TYPE_INVALID:
 567                 break;
 568         }
 569
 570         panic("invalid type found");
 571 }
 572
 573 static bool function_types_compatible(const function_type_t *func1,
 574                                       const function_type_t *func2)
 575 {
 576         if(!types_compatible(func1->return_type, func2->return_type))
 577                 return false;
 578
 579         /* can parameters be compared? */
 580         if(func1->unspecified_parameters || func2->unspecified_parameters)
 581                 return true;
 582
 583         if(func1->variadic != func2->variadic)
 584                 return false;
 585
 586         /* TODO: handling of unspecified parameters not correct yet */
 587
 588         /* all argument types must be compatible */
 589         function_parameter_t *parameter1 = func1->parameters;
 590         function_parameter_t *parameter2 = func2->parameters;
 591         for( ; parameter1 != NULL && parameter2 != NULL;
 592                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 593                 type_t *parameter1_type = skip_typeref(parameter1->type);
 594                 type_t *parameter2_type = skip_typeref(parameter2->type);
 595
 596                 parameter1_type = get_unqualified_type(parameter1_type);
 597                 parameter2_type = get_unqualified_type(parameter2_type);
 598
 599                 if(!types_compatible(parameter1_type, parameter2_type))
 600                         return false;
 601         }
 602         /* same number of arguments? */
 603         if(parameter1 != NULL || parameter2 != NULL)
 604                 return false;
 605
 606         return true;
 607 }
 608
 609 static bool array_types_compatible(const array_type_t *array1,
 610                                    const array_type_t *array2)
 611 {
 612         type_t *element_type1 = skip_typeref(array1->element_type);
 613         type_t *element_type2 = skip_typeref(array2->element_type);
 614         if(!types_compatible(element_type1, element_type2))
 615                 return false;
 616
 617         if(array1->size != NULL && array2->size != NULL) {
 618                 /* TODO: check if size expression evaluate to the same value
 619                  * if they are constant */
 620         }
 621
 622         return true;
 623 }
 624
 625 bool types_compatible(const type_t *type1, const type_t *type2)
 626 {
 627         assert(!is_typeref(type1));
 628         assert(!is_typeref(type2));
 629
 630         /* shortcut: the same type is always compatible */
 631         if(type1 == type2)
 632                 return true;
 633
 634         if(type1->base.qualifiers != type2->base.qualifiers)
 635                 return false;
 636         if(type1->kind != type2->kind)
 637                 return false;
 638
 639         switch(type1->kind) {
 640         case TYPE_FUNCTION:
 641                 return function_types_compatible(&type1->function, &type2->function);
 642         case TYPE_ATOMIC:
 643                 return type1->atomic.atype == type2->atomic.atype;
 644         case TYPE_ARRAY:
 645                 return array_types_compatible(&type1->array, &type2->array);
 646         case TYPE_POINTER:
 647                 return types_compatible(type1->pointer.points_to,
 648                                         type2->pointer.points_to);
 649         case TYPE_COMPOUND_STRUCT:
 650         case TYPE_COMPOUND_UNION:
 651         case TYPE_ENUM:
 652         case TYPE_BUILTIN:
 653                 /* TODO: not implemented */
 654                 break;
 655
 656         case TYPE_BITFIELD:
 657                 /* not sure if this makes sense or is even needed, implement it if you
 658                  * really need it! */
 659                 panic("type compatibility check for bitfield type");
 660
 661         case TYPE_INVALID:
 662                 panic("invalid type found in compatible types");
 663         case TYPE_TYPEDEF:
 664         case TYPE_TYPEOF:
 665                 panic("typerefs not skipped in compatible types?!?");
 666         }
 667
 668         /* TODO: incomplete */
 669         return false;
 670 }
 671
 672 bool pointers_compatible(const type_t *type1, const type_t *type2)
 673 {
 674         assert(!is_typeref(type1));
 675         assert(!is_typeref(type2));
 676
 677         assert(type1->kind == TYPE_POINTER);
 678         assert(type2->kind == TYPE_POINTER);
 679         /* TODO */
 680         return true;
 681 }
 682
 683 type_t *skip_typeref(type_t *type)
 684 {
 685         unsigned qualifiers = type->base.qualifiers;
 686
 687         while(true) {
 688                 switch(type->kind) {
 689                 case TYPE_TYPEDEF: {
 690                         qualifiers |= type->base.qualifiers;
 691                         const typedef_type_t *typedef_type = &type->typedeft;
 692                         if(typedef_type->resolved_type != NULL) {
 693                                 type = typedef_type->resolved_type;
 694                                 break;
 695                         }
 696                         type = typedef_type->declaration->type;
 697                         continue;
 698                 }
 699                 case TYPE_TYPEOF: {
 700                         const typeof_type_t *typeof_type = &type->typeoft;
 701                         if(typeof_type->typeof_type != NULL) {
 702                                 type = typeof_type->typeof_type;
 703                         } else {
 704                                 type = typeof_type->expression->base.datatype;
 705                         }
 706                         continue;
 707                 }
 708                 default:
 709                         break;
 710                 }
 711                 break;
 712         }
 713
 714         return type;
 715 }
 716
 717
 718
 719 static type_t *identify_new_type(type_t *type)
 720 {
 721         type_t *result = typehash_insert(type);
 722         if(result != type) {
 723                 obstack_free(type_obst, type);
 724         }
 725         return result;
 726 }
 727
 728 type_t *make_atomic_type(atomic_type_type_t atype, type_qualifiers_t qualifiers)
 729 {
 730         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
 731         memset(type, 0, sizeof(atomic_type_t));
 732
 733         type->kind            = TYPE_ATOMIC;
 734         type->base.qualifiers = qualifiers;
 735         type->atomic.atype    = atype;
 736
 737         return identify_new_type(type);
 738 }
 739
 740 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
 741 {
 742         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
 743         memset(type, 0, sizeof(pointer_type_t));
 744
 745         type->kind              = TYPE_POINTER;
 746         type->base.qualifiers   = qualifiers;
 747         type->pointer.points_to = points_to;
 748
 749         return identify_new_type(type);
 750 }
 751
 752 static __attribute__((unused))
 753 void dbg_type(type_t *type)
 754 {
 755         FILE *old_out = out;
 756         out = stderr;
 757         print_type(type);
 758         puts("\n");
 759         fflush(stderr);
 760         out = old_out;
 761 }