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 "symbol_t.h"
  27 #include "type_hash.h"
  28 #include "adt/error.h"
  29 #include "lang_features.h"
  30
  31 static struct obstack   _type_obst;
  32 static FILE            *out;
  33 struct obstack         *type_obst                 = &_type_obst;
  34 static int              type_visited              = 0;
  35 static bool             print_implicit_array_size = false;
  36
  37 static void intern_print_type_pre(const type_t *type, bool top);
  38 static void intern_print_type_post(const type_t *type, bool top);
  39
  40 typedef struct atomic_type_properties_t atomic_type_properties_t;
  41 struct atomic_type_properties_t {
  42         unsigned   size;              /**< type size in bytes */
  43         unsigned   alignment;         /**< type alignment in bytes */
  44         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  45 };
  46
  47 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  48         //ATOMIC_TYPE_INVALID = 0,
  49         [ATOMIC_TYPE_VOID] = {
  50                 .size       = 0,
  51                 .alignment  = 0,
  52                 .flags      = ATOMIC_TYPE_FLAG_NONE
  53         },
  54         [ATOMIC_TYPE_CHAR] = {
  55                 .size       = 1,
  56                 .alignment  = 1,
  57                 /* signed flag will be set when known */
  58                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  59         },
  60         [ATOMIC_TYPE_SCHAR] = {
  61                 .size       = 1,
  62                 .alignment  = 1,
  63                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  64                               | ATOMIC_TYPE_FLAG_SIGNED,
  65         },
  66         [ATOMIC_TYPE_UCHAR] = {
  67                 .size       = 1,
  68                 .alignment  = 1,
  69                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  70         },
  71         [ATOMIC_TYPE_SHORT] = {
  72                 .size       = 2,
  73                 .alignment  = 2,
  74                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  75                               | ATOMIC_TYPE_FLAG_SIGNED
  76         },
  77         [ATOMIC_TYPE_USHORT] = {
  78                 .size       = 2,
  79                 .alignment  = 2,
  80                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  81         },
  82         [ATOMIC_TYPE_INT] = {
  83                 .size       = (unsigned) -1,
  84                 .alignment  = (unsigned) -1,
  85                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  86                               | ATOMIC_TYPE_FLAG_SIGNED,
  87         },
  88         [ATOMIC_TYPE_UINT] = {
  89                 .size       = (unsigned) -1,
  90                 .alignment  = (unsigned) -1,
  91                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  92         },
  93         [ATOMIC_TYPE_LONG] = {
  94                 .size       = (unsigned) -1,
  95                 .alignment  = (unsigned) -1,
  96                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  97                               | ATOMIC_TYPE_FLAG_SIGNED,
  98         },
  99         [ATOMIC_TYPE_ULONG] = {
 100                 .size       = (unsigned) -1,
 101                 .alignment  = (unsigned) -1,
 102                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 103         },
 104         [ATOMIC_TYPE_LONGLONG] = {
 105                 .size       = (unsigned) -1,
 106                 .alignment  = (unsigned) -1,
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 108                               | ATOMIC_TYPE_FLAG_SIGNED,
 109         },
 110         [ATOMIC_TYPE_ULONGLONG] = {
 111                 .size       = (unsigned) -1,
 112                 .alignment  = (unsigned) -1,
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_BOOL] = {
 116                 .size       = (unsigned) -1,
 117                 .alignment  = (unsigned) -1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 119         },
 120         [ATOMIC_TYPE_FLOAT] = {
 121                 .size       = 4,
 122                 .alignment  = (unsigned) -1,
 123                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 124                               | ATOMIC_TYPE_FLAG_SIGNED,
 125         },
 126         [ATOMIC_TYPE_DOUBLE] = {
 127                 .size       = 8,
 128                 .alignment  = (unsigned) -1,
 129                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 130                               | ATOMIC_TYPE_FLAG_SIGNED,
 131         },
 132         [ATOMIC_TYPE_LONG_DOUBLE] = {
 133                 .size       = 12,
 134                 .alignment  = (unsigned) -1,
 135                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 136                               | ATOMIC_TYPE_FLAG_SIGNED,
 137         },
 138         /* complex and imaginary types are set in init_types */
 139 };
 140
 141 void init_types(void)
 142 {
 143         obstack_init(type_obst);
 144
 145         atomic_type_properties_t *props = atomic_type_properties;
 146
 147         if(char_is_signed) {
 148                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 149         }
 150
 151         unsigned int_size   = machine_size < 32 ? 2 : 4;
 152         unsigned long_size  = machine_size < 64 ? 4 : 8;
 153         unsigned llong_size = machine_size < 32 ? 4 : 8;
 154
 155         props[ATOMIC_TYPE_INT].size            = int_size;
 156         props[ATOMIC_TYPE_INT].alignment       = int_size;
 157         props[ATOMIC_TYPE_UINT].size           = int_size;
 158         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 159         props[ATOMIC_TYPE_LONG].size           = long_size;
 160         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 161         props[ATOMIC_TYPE_ULONG].size          = long_size;
 162         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 163         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 164         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 165         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 166         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 167
 168         /* TODO: backend specific, need a way to query the backend for this.
 169          * The following are good settings for x86 */
 170         props[ATOMIC_TYPE_FLOAT].alignment     = 4;
 171         props[ATOMIC_TYPE_DOUBLE].alignment    = 4;
 172         props[ATOMIC_TYPE_LONGLONG].alignment  = 4;
 173         props[ATOMIC_TYPE_ULONGLONG].alignment = 4;
 174
 175         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UINT];
 176 }
 177
 178 void exit_types(void)
 179 {
 180         obstack_free(type_obst, NULL);
 181 }
 182
 183 void type_set_output(FILE *stream)
 184 {
 185         out = stream;
 186 }
 187
 188 void inc_type_visited(void)
 189 {
 190         type_visited++;
 191 }
 192
 193 void print_type_qualifiers(type_qualifiers_t qualifiers)
 194 {
 195         if(qualifiers & TYPE_QUALIFIER_CONST)    fputs("const ",    out);
 196         if(qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out);
 197         if(qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out);
 198 }
 199
 200 /**
 201  * Prints the name of an atomic type kinds.
 202  *
 203  * @param kind  The type kind.
 204  */
 205 static
 206 void print_atomic_kinds(atomic_type_kind_t kind)
 207 {
 208         const char *s = "INVALIDATOMIC";
 209         switch(kind) {
 210         case ATOMIC_TYPE_INVALID:                               break;
 211         case ATOMIC_TYPE_VOID:        s = "void";               break;
 212         case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
 213         case ATOMIC_TYPE_CHAR:        s = "char";               break;
 214         case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
 215         case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
 216         case ATOMIC_TYPE_INT:         s = "int";                break;
 217         case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
 218         case ATOMIC_TYPE_SHORT:       s = "short";              break;
 219         case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
 220         case ATOMIC_TYPE_LONG:        s = "long";               break;
 221         case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
 222         case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
 223         case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
 224         case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
 225         case ATOMIC_TYPE_FLOAT:       s = "float";              break;
 226         case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
 227         }
 228         fputs(s, out);
 229 }
 230
 231 /**
 232  * Prints the name of an atomic type.
 233  *
 234  * @param type  The type.
 235  */
 236 static
 237 void print_atomic_type(const atomic_type_t *type)
 238 {
 239         print_type_qualifiers(type->base.qualifiers);
 240         print_atomic_kinds(type->akind);
 241 }
 242
 243 /**
 244  * Prints the name of a complex type.
 245  *
 246  * @param type  The type.
 247  */
 248 static
 249 void print_complex_type(const complex_type_t *type)
 250 {
 251         print_type_qualifiers(type->base.qualifiers);
 252         fputs("_Complex ", out);
 253         print_atomic_kinds(type->akind);
 254 }
 255
 256 /**
 257  * Prints the name of an imaginary type.
 258  *
 259  * @param type  The type.
 260  */
 261 static
 262 void print_imaginary_type(const imaginary_type_t *type)
 263 {
 264         print_type_qualifiers(type->base.qualifiers);
 265         fputs("_Imaginary ", out);
 266         print_atomic_kinds(type->akind);
 267 }
 268
 269 /**
 270  * Print the first part (the prefix) of a type.
 271  *
 272  * @param type   The type to print.
 273  * @param top    true, if this is the top type, false if it's an embedded type.
 274  */
 275 static void print_function_type_pre(const function_type_t *type, bool top)
 276 {
 277         print_type_qualifiers(type->base.qualifiers);
 278
 279         intern_print_type_pre(type->return_type, false);
 280
 281         /* don't emit braces if we're the toplevel type... */
 282         if(!top)
 283                 fputc('(', out);
 284 }
 285
 286 /**
 287  * Print the second part (the postfix) of a type.
 288  *
 289  * @param type   The type to print.
 290  * @param top    true, if this is the top type, false if it's an embedded type.
 291  */
 292 static void print_function_type_post(const function_type_t *type,
 293                                      const scope_t *scope, bool top)
 294 {
 295         intern_print_type_post(type->return_type, false);
 296         /* don't emit braces if we're the toplevel type... */
 297         if(!top)
 298                 fputc(')', out);
 299
 300         fputc('(', out);
 301
 302         int first = 1;
 303         if(scope == NULL) {
 304                 function_parameter_t *parameter = type->parameters;
 305                 for( ; parameter != NULL; parameter = parameter->next) {
 306                         if(first) {
 307                                 first = 0;
 308                         } else {
 309                                 fputs(", ", out);
 310                         }
 311                         print_type(parameter->type);
 312                 }
 313         } else {
 314                 declaration_t *parameter = scope->declarations;
 315                 for( ; parameter != NULL; parameter = parameter->next) {
 316                         if(first) {
 317                                 first = 0;
 318                         } else {
 319                                 fputs(", ", out);
 320                         }
 321                         print_type_ext(parameter->type, parameter->symbol,
 322                                        &parameter->scope);
 323                 }
 324         }
 325         if(type->variadic) {
 326                 if(first) {
 327                         first = 0;
 328                 } else {
 329                         fputs(", ", out);
 330                 }
 331                 fputs("...", out);
 332         }
 333         if(first && !type->unspecified_parameters) {
 334                 fputs("void", out);
 335         }
 336         fputc(')', out);
 337 }
 338
 339 /**
 340  * Prints the prefix part of a pointer type.
 341  *
 342  * @param type   The pointer type.
 343  */
 344 static void print_pointer_type_pre(const pointer_type_t *type)
 345 {
 346         intern_print_type_pre(type->points_to, false);
 347         fputs("*", out);
 348         print_type_qualifiers(type->base.qualifiers);
 349 }
 350
 351 /**
 352  * Prints the postfix part of a pointer type.
 353  *
 354  * @param type   The pointer type.
 355  */
 356 static void print_pointer_type_post(const pointer_type_t *type)
 357 {
 358         intern_print_type_post(type->points_to, false);
 359 }
 360
 361 /**
 362  * Prints the prefix part of an array type.
 363  *
 364  * @param type   The array type.
 365  */
 366 static void print_array_type_pre(const array_type_t *type)
 367 {
 368         intern_print_type_pre(type->element_type, false);
 369 }
 370
 371 /**
 372  * Prints the postfix part of an array type.
 373  *
 374  * @param type   The array type.
 375  */
 376 static void print_array_type_post(const array_type_t *type)
 377 {
 378         fputc('[', out);
 379         if(type->is_static) {
 380                 fputs("static ", out);
 381         }
 382         print_type_qualifiers(type->base.qualifiers);
 383         if(type->size_expression != NULL
 384                         && (print_implicit_array_size || !type->has_implicit_size)) {
 385                 print_expression(type->size_expression);
 386         }
 387         fputc(']', out);
 388         intern_print_type_post(type->element_type, false);
 389 }
 390
 391 /**
 392  * Prints the postfix part of a bitfield type.
 393  *
 394  * @param type   The array type.
 395  */
 396 static void print_bitfield_type_post(const bitfield_type_t *type)
 397 {
 398         fputs(" : ", out);
 399         print_expression(type->size);
 400         intern_print_type_post(type->base_type, false);
 401 }
 402
 403 /**
 404  * Prints an enum definition.
 405  *
 406  * @param declaration  The enum's type declaration.
 407  */
 408 void print_enum_definition(const declaration_t *declaration)
 409 {
 410         fputs("{\n", out);
 411
 412         change_indent(1);
 413
 414         declaration_t *entry = declaration->next;
 415         for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
 416                entry = entry->next) {
 417
 418                 print_indent();
 419                 fprintf(out, "%s", entry->symbol->string);
 420                 if(entry->init.initializer != NULL) {
 421                         fprintf(out, " = ");
 422
 423                         /* skip the implicit cast */
 424                         expression_t *expression = entry->init.enum_value;
 425                         if(expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 426                                 expression = expression->unary.value;
 427                         }
 428                         print_expression(expression);
 429                 }
 430                 fprintf(out, ",\n");
 431         }
 432
 433         change_indent(-1);
 434         print_indent();
 435         fputs("}", out);
 436 }
 437
 438 /**
 439  * Prints an enum type.
 440  *
 441  * @param type  The enum type.
 442  */
 443 static void print_type_enum(const enum_type_t *type)
 444 {
 445         print_type_qualifiers(type->base.qualifiers);
 446         fputs("enum ", out);
 447
 448         declaration_t *declaration = type->declaration;
 449         symbol_t      *symbol      = declaration->symbol;
 450         if(symbol != NULL) {
 451                 fputs(symbol->string, out);
 452         } else {
 453                 print_enum_definition(declaration);
 454         }
 455 }
 456
 457 /**
 458  * Print the compound part of a compound type.
 459  *
 460  * @param declaration  The declaration of the compound type.
 461  */
 462 void print_compound_definition(const declaration_t *declaration)
 463 {
 464         fputs("{\n", out);
 465         change_indent(1);
 466
 467         declaration_t *iter = declaration->scope.declarations;
 468         for( ; iter != NULL; iter = iter->next) {
 469                 print_indent();
 470                 print_declaration(iter);
 471                 fputc('\n', out);
 472         }
 473
 474         change_indent(-1);
 475         print_indent();
 476         fputs("}", out);
 477 }
 478
 479 /**
 480  * Prints a compound type.
 481  *
 482  * @param type  The compound type.
 483  */
 484 static void print_compound_type(const compound_type_t *type)
 485 {
 486         print_type_qualifiers(type->base.qualifiers);
 487
 488         if(type->base.kind == TYPE_COMPOUND_STRUCT) {
 489                 fputs("struct ", out);
 490         } else {
 491                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 492                 fputs("union ", out);
 493         }
 494
 495         declaration_t *declaration = type->declaration;
 496         symbol_t      *symbol      = declaration->symbol;
 497         if(symbol != NULL) {
 498                 fputs(symbol->string, out);
 499         } else {
 500                 print_compound_definition(declaration);
 501         }
 502 }
 503
 504 /**
 505  * Prints the prefix part of a typedef type.
 506  *
 507  * @param type   The typedef type.
 508  */
 509 static void print_typedef_type_pre(const typedef_type_t *const type)
 510 {
 511         print_type_qualifiers(type->base.qualifiers);
 512         fputs(type->declaration->symbol->string, out);
 513 }
 514
 515 /**
 516  * Prints the prefix part of a typeof type.
 517  *
 518  * @param type   The typeof type.
 519  */
 520 static void print_typeof_type_pre(const typeof_type_t *const type)
 521 {
 522         fputs("typeof(", out);
 523         if(type->expression != NULL) {
 524                 assert(type->typeof_type == NULL);
 525                 print_expression(type->expression);
 526         } else {
 527                 print_type(type->typeof_type);
 528         }
 529         fputc(')', out);
 530 }
 531
 532 /**
 533  * Prints the prefix part of a type.
 534  *
 535  * @param type   The type.
 536  * @param top    true if we print the toplevel type, false else.
 537  */
 538 static void intern_print_type_pre(const type_t *const type, const bool top)
 539 {
 540         switch(type->kind) {
 541         case TYPE_ERROR:
 542                 fputs("<error>", out);
 543         case TYPE_INVALID:
 544                 fputs("<invalid>", out);
 545                 return;
 546         case TYPE_ENUM:
 547                 print_type_enum(&type->enumt);
 548                 return;
 549         case TYPE_ATOMIC:
 550                 print_atomic_type(&type->atomic);
 551                 return;
 552         case TYPE_COMPLEX:
 553                 print_complex_type(&type->complex);
 554                 return;
 555         case TYPE_IMAGINARY:
 556                 print_imaginary_type(&type->imaginary);
 557                 return;
 558         case TYPE_COMPOUND_STRUCT:
 559         case TYPE_COMPOUND_UNION:
 560                 print_compound_type(&type->compound);
 561                 return;
 562         case TYPE_BUILTIN:
 563                 fputs(type->builtin.symbol->string, out);
 564                 return;
 565         case TYPE_FUNCTION:
 566                 print_function_type_pre(&type->function, top);
 567                 return;
 568         case TYPE_POINTER:
 569                 print_pointer_type_pre(&type->pointer);
 570                 return;
 571         case TYPE_BITFIELD:
 572                 intern_print_type_pre(type->bitfield.base_type, top);
 573                 return;
 574         case TYPE_ARRAY:
 575                 print_array_type_pre(&type->array);
 576                 return;
 577         case TYPE_TYPEDEF:
 578                 print_typedef_type_pre(&type->typedeft);
 579                 return;
 580         case TYPE_TYPEOF:
 581                 print_typeof_type_pre(&type->typeoft);
 582                 return;
 583         }
 584         fputs("unknown", out);
 585 }
 586
 587 /**
 588  * Prints the postfix part of a type.
 589  *
 590  * @param type   The type.
 591  * @param top    true if we print the toplevel type, false else.
 592  */
 593 static void intern_print_type_post(const type_t *const type, const bool top)
 594 {
 595         switch(type->kind) {
 596         case TYPE_FUNCTION:
 597                 print_function_type_post(&type->function, NULL, top);
 598                 return;
 599         case TYPE_POINTER:
 600                 print_pointer_type_post(&type->pointer);
 601                 return;
 602         case TYPE_ARRAY:
 603                 print_array_type_post(&type->array);
 604                 return;
 605         case TYPE_BITFIELD:
 606                 print_bitfield_type_post(&type->bitfield);
 607                 return;
 608         case TYPE_ERROR:
 609         case TYPE_INVALID:
 610         case TYPE_ATOMIC:
 611         case TYPE_COMPLEX:
 612         case TYPE_IMAGINARY:
 613         case TYPE_ENUM:
 614         case TYPE_COMPOUND_STRUCT:
 615         case TYPE_COMPOUND_UNION:
 616         case TYPE_BUILTIN:
 617         case TYPE_TYPEOF:
 618         case TYPE_TYPEDEF:
 619                 break;
 620         }
 621 }
 622
 623 /**
 624  * Prints a type.
 625  *
 626  * @param type   The type.
 627  */
 628 void print_type(const type_t *const type)
 629 {
 630         print_type_ext(type, NULL, NULL);
 631 }
 632
 633 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 634                     const scope_t *scope)
 635 {
 636         if(type == NULL) {
 637                 fputs("nil type", out);
 638                 return;
 639         }
 640
 641         intern_print_type_pre(type, true);
 642         if(symbol != NULL) {
 643                 fputc(' ', out);
 644                 fputs(symbol->string, out);
 645         }
 646         if(type->kind == TYPE_FUNCTION) {
 647                 print_function_type_post(&type->function, scope, true);
 648         } else {
 649                 intern_print_type_post(type, true);
 650         }
 651 }
 652
 653 /**
 654  * Return the size of a type AST node.
 655  *
 656  * @param type  The type.
 657  */
 658 static size_t get_type_size(const type_t *type)
 659 {
 660         switch(type->kind) {
 661         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 662         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 663         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 664         case TYPE_COMPOUND_STRUCT:
 665         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 666         case TYPE_ENUM:            return sizeof(enum_type_t);
 667         case TYPE_FUNCTION:        return sizeof(function_type_t);
 668         case TYPE_POINTER:         return sizeof(pointer_type_t);
 669         case TYPE_ARRAY:           return sizeof(array_type_t);
 670         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 671         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 672         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 673         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 674         case TYPE_ERROR:           panic("error type found");
 675         case TYPE_INVALID:         panic("invalid type found");
 676         }
 677         panic("unknown type found");
 678 }
 679
 680 /**
 681  * Duplicates a type.
 682  *
 683  * @param type  The type to copy.
 684  * @return A copy of the type.
 685  *
 686  * @note This does not produce a deep copy!
 687  */
 688 type_t *duplicate_type(const type_t *type)
 689 {
 690         size_t size = get_type_size(type);
 691
 692         type_t *copy = obstack_alloc(type_obst, size);
 693         memcpy(copy, type, size);
 694
 695         return copy;
 696 }
 697
 698 /**
 699  * Returns the unqualified type of a given type.
 700  *
 701  * @param type  The type.
 702  * @returns The unqualified type.
 703  */
 704 type_t *get_unqualified_type(type_t *type)
 705 {
 706         if(type->base.qualifiers == TYPE_QUALIFIER_NONE)
 707                 return type;
 708
 709         type_t *unqualified_type          = duplicate_type(type);
 710         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 711
 712         type_t *result = typehash_insert(unqualified_type);
 713         if(result != unqualified_type) {
 714                 obstack_free(type_obst, unqualified_type);
 715         }
 716
 717         return result;
 718 }
 719
 720 /**
 721  * Check if a type is valid.
 722  *
 723  * @param type  The type to check.
 724  * @return true if type represents a valid type.
 725  */
 726 bool type_valid(const type_t *type)
 727 {
 728         return type->kind != TYPE_INVALID;
 729 }
 730
 731 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 732                                   atomic_type_flag_t flag)
 733 {
 734         assert(kind <= ATOMIC_TYPE_LAST);
 735         return (atomic_type_properties[kind].flags & flag) != 0;
 736 }
 737
 738 /**
 739  * Returns true if the given type is an integer type.
 740  *
 741  * @param type  The type to check.
 742  * @return True if type is an integer type.
 743  */
 744 bool is_type_integer(const type_t *type)
 745 {
 746         assert(!is_typeref(type));
 747
 748         if(type->kind == TYPE_ENUM)
 749                 return true;
 750
 751         if(type->kind != TYPE_ATOMIC)
 752                 return false;
 753
 754         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 755 }
 756
 757 /**
 758  * Returns true if the given type is an floating point type.
 759  *
 760  * @param type  The type to check.
 761  * @return True if type is a floating point type.
 762  */
 763 bool is_type_float(const type_t *type)
 764 {
 765         assert(!is_typeref(type));
 766
 767         if(type->kind != TYPE_ATOMIC)
 768                 return false;
 769
 770         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 771 }
 772
 773 /**
 774  * Returns true if the given type is a signed type.
 775  *
 776  * @param type  The type to check.
 777  * @return True if type is a signed type.
 778  */
 779 bool is_type_signed(const type_t *type)
 780 {
 781         assert(!is_typeref(type));
 782
 783         /* enum types are int for now */
 784         if(type->kind == TYPE_ENUM)
 785                 return true;
 786
 787         if(type->kind != TYPE_ATOMIC)
 788                 return false;
 789
 790         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 791 }
 792
 793 /**
 794  * Returns true if the given type represents an arithmetic type.
 795  *
 796  * @param type  The type to check.
 797  * @return True if type represents an arithmetic type.
 798  */
 799 bool is_type_arithmetic(const type_t *type)
 800 {
 801         assert(!is_typeref(type));
 802
 803         switch(type->kind) {
 804         case TYPE_BITFIELD:
 805         case TYPE_ENUM:
 806                 return true;
 807         case TYPE_ATOMIC:
 808                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 809         case TYPE_COMPLEX:
 810                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 811         case TYPE_IMAGINARY:
 812                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 813         default:
 814                 return false;
 815         }
 816 }
 817
 818 /**
 819  * Returns true if the given type represents a scalar type.
 820  *
 821  * @param type  The type to check.
 822  * @return True if type represents a scalar type.
 823  */
 824 bool is_type_scalar(const type_t *type)
 825 {
 826         assert(!is_typeref(type));
 827
 828         switch (type->kind) {
 829                 case TYPE_POINTER: return true;
 830                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 831                 default:           break;
 832         }
 833
 834         return is_type_arithmetic(type);
 835 }
 836
 837 /**
 838  * Check if a given type is incomplete.
 839  *
 840  * @param type  The type to check.
 841  * @return True if the given type is incomplete (ie. just forward).
 842  */
 843 bool is_type_incomplete(const type_t *type)
 844 {
 845         assert(!is_typeref(type));
 846
 847         switch(type->kind) {
 848         case TYPE_COMPOUND_STRUCT:
 849         case TYPE_COMPOUND_UNION: {
 850                 const compound_type_t *compound_type = &type->compound;
 851                 declaration_t         *declaration   = compound_type->declaration;
 852                 return !declaration->init.complete;
 853         }
 854         case TYPE_ENUM: {
 855                 const enum_type_t *enum_type   = &type->enumt;
 856                 declaration_t     *declaration = enum_type->declaration;
 857                 return !declaration->init.complete;
 858         }
 859         case TYPE_BITFIELD:
 860         case TYPE_FUNCTION:
 861                 return true;
 862
 863         case TYPE_ARRAY:
 864                 return type->array.size_expression == NULL;
 865
 866         case TYPE_ATOMIC:
 867                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 868
 869         case TYPE_COMPLEX:
 870                 return type->complex.akind == ATOMIC_TYPE_VOID;
 871
 872         case TYPE_IMAGINARY:
 873                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 874
 875         case TYPE_POINTER:
 876         case TYPE_BUILTIN:
 877         case TYPE_ERROR:
 878                 return false;
 879
 880         case TYPE_TYPEDEF:
 881         case TYPE_TYPEOF:
 882                 panic("is_type_incomplete called without typerefs skipped");
 883         case TYPE_INVALID:
 884                 break;
 885         }
 886
 887         panic("invalid type found");
 888 }
 889
 890 /**
 891  * Check if two function types are compatible.
 892  */
 893 static bool function_types_compatible(const function_type_t *func1,
 894                                       const function_type_t *func2)
 895 {
 896         const type_t* const ret1 = skip_typeref(func1->return_type);
 897         const type_t* const ret2 = skip_typeref(func2->return_type);
 898         if (!types_compatible(ret1, ret2))
 899                 return false;
 900
 901         /* can parameters be compared? */
 902         if(func1->unspecified_parameters || func2->unspecified_parameters)
 903                 return true;
 904
 905         if(func1->variadic != func2->variadic)
 906                 return false;
 907
 908         /* TODO: handling of unspecified parameters not correct yet */
 909
 910         /* all argument types must be compatible */
 911         function_parameter_t *parameter1 = func1->parameters;
 912         function_parameter_t *parameter2 = func2->parameters;
 913         for( ; parameter1 != NULL && parameter2 != NULL;
 914                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 915                 type_t *parameter1_type = skip_typeref(parameter1->type);
 916                 type_t *parameter2_type = skip_typeref(parameter2->type);
 917
 918                 parameter1_type = get_unqualified_type(parameter1_type);
 919                 parameter2_type = get_unqualified_type(parameter2_type);
 920
 921                 if(!types_compatible(parameter1_type, parameter2_type))
 922                         return false;
 923         }
 924         /* same number of arguments? */
 925         if(parameter1 != NULL || parameter2 != NULL)
 926                 return false;
 927
 928         return true;
 929 }
 930
 931 /**
 932  * Check if two array types are compatible.
 933  */
 934 static bool array_types_compatible(const array_type_t *array1,
 935                                    const array_type_t *array2)
 936 {
 937         type_t *element_type1 = skip_typeref(array1->element_type);
 938         type_t *element_type2 = skip_typeref(array2->element_type);
 939         if(!types_compatible(element_type1, element_type2))
 940                 return false;
 941
 942         if(!array1->size_constant || !array2->size_constant)
 943                 return true;
 944
 945         return array1->size == array2->size;
 946 }
 947
 948 /**
 949  * Check if two types are compatible.
 950  */
 951 bool types_compatible(const type_t *type1, const type_t *type2)
 952 {
 953         assert(!is_typeref(type1));
 954         assert(!is_typeref(type2));
 955
 956         /* shortcut: the same type is always compatible */
 957         if(type1 == type2)
 958                 return true;
 959
 960         if(type1->base.qualifiers != type2->base.qualifiers)
 961                 return false;
 962         if(type1->kind != type2->kind)
 963                 return false;
 964
 965         switch(type1->kind) {
 966         case TYPE_FUNCTION:
 967                 return function_types_compatible(&type1->function, &type2->function);
 968         case TYPE_ATOMIC:
 969                 return type1->atomic.akind == type2->atomic.akind;
 970         case TYPE_COMPLEX:
 971                 return type1->complex.akind == type2->complex.akind;
 972         case TYPE_IMAGINARY:
 973                 return type1->imaginary.akind == type2->imaginary.akind;
 974         case TYPE_ARRAY:
 975                 return array_types_compatible(&type1->array, &type2->array);
 976
 977         case TYPE_POINTER: {
 978                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
 979                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
 980                 return types_compatible(to1, to2);
 981         }
 982
 983         case TYPE_COMPOUND_STRUCT:
 984         case TYPE_COMPOUND_UNION:
 985         case TYPE_ENUM:
 986         case TYPE_BUILTIN:
 987                 /* TODO: not implemented */
 988                 break;
 989
 990         case TYPE_BITFIELD:
 991                 /* not sure if this makes sense or is even needed, implement it if you
 992                  * really need it! */
 993                 panic("type compatibility check for bitfield type");
 994
 995         case TYPE_ERROR:
 996                 /* Hmm, the error type should be compatible to all other types */
 997                 return true;
 998         case TYPE_INVALID:
 999                 panic("invalid type found in compatible types");
1000         case TYPE_TYPEDEF:
1001         case TYPE_TYPEOF:
1002                 panic("typerefs not skipped in compatible types?!?");
1003         }
1004
1005         /* TODO: incomplete */
1006         return false;
1007 }
1008
1009 /**
1010  * Check if two pointer types are compatible.
1011  */
1012 bool pointers_compatible(const type_t *type1, const type_t *type2)
1013 {
1014         assert(!is_typeref(type1));
1015         assert(!is_typeref(type2));
1016
1017         assert(type1->kind == TYPE_POINTER);
1018         assert(type2->kind == TYPE_POINTER);
1019         (void) type1;
1020         (void) type2;
1021         /* TODO */
1022         return true;
1023 }
1024
1025 /**
1026  * Skip all typerefs and return the underlying type.
1027  */
1028 type_t *skip_typeref(type_t *type)
1029 {
1030         unsigned qualifiers = TYPE_QUALIFIER_NONE;
1031
1032         while(true) {
1033                 switch(type->kind) {
1034                 case TYPE_ERROR:
1035                         return type;
1036                 case TYPE_TYPEDEF: {
1037                         qualifiers |= type->base.qualifiers;
1038                         const typedef_type_t *typedef_type = &type->typedeft;
1039                         if(typedef_type->resolved_type != NULL) {
1040                                 type = typedef_type->resolved_type;
1041                                 break;
1042                         }
1043                         type = typedef_type->declaration->type;
1044                         continue;
1045                 }
1046                 case TYPE_TYPEOF: {
1047                         const typeof_type_t *typeof_type = &type->typeoft;
1048                         if(typeof_type->typeof_type != NULL) {
1049                                 type = typeof_type->typeof_type;
1050                         } else {
1051                                 type = typeof_type->expression->base.type;
1052                         }
1053                         continue;
1054                 }
1055                 default:
1056                         break;
1057                 }
1058                 break;
1059         }
1060
1061         if (qualifiers != TYPE_QUALIFIER_NONE) {
1062                 type_t *const copy     = duplicate_type(type);
1063                 copy->base.qualifiers |= qualifiers;
1064
1065                 type = typehash_insert(copy);
1066                 if (type != copy) {
1067                         obstack_free(type_obst, copy);
1068                 }
1069         }
1070
1071         return type;
1072 }
1073
1074 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1075 {
1076         assert(kind <= ATOMIC_TYPE_LAST);
1077         return atomic_type_properties[kind].size;
1078 }
1079
1080 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1081 {
1082         assert(kind <= ATOMIC_TYPE_LAST);
1083         return atomic_type_properties[kind].alignment;
1084 }
1085
1086 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1087 {
1088         assert(kind <= ATOMIC_TYPE_LAST);
1089         return atomic_type_properties[kind].flags;
1090 }
1091
1092 atomic_type_kind_t get_intptr_kind(void)
1093 {
1094         if(machine_size <= 32)
1095                 return ATOMIC_TYPE_INT;
1096         else if(machine_size <= 64)
1097                 return ATOMIC_TYPE_LONG;
1098         else
1099                 return ATOMIC_TYPE_LONGLONG;
1100 }
1101
1102 atomic_type_kind_t get_uintptr_kind(void)
1103 {
1104         if(machine_size <= 32)
1105                 return ATOMIC_TYPE_UINT;
1106         else if(machine_size <= 64)
1107                 return ATOMIC_TYPE_ULONG;
1108         else
1109                 return ATOMIC_TYPE_ULONGLONG;
1110 }
1111
1112 /**
1113  * Find the atomic type kind representing a given size (signed).
1114  */
1115 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1116         static atomic_type_kind_t kinds[32];
1117
1118         assert(size < 32);
1119         atomic_type_kind_t kind = kinds[size];
1120         if(kind == ATOMIC_TYPE_INVALID) {
1121                 static const atomic_type_kind_t possible_kinds[] = {
1122                         ATOMIC_TYPE_SCHAR,
1123                         ATOMIC_TYPE_SHORT,
1124                         ATOMIC_TYPE_INT,
1125                         ATOMIC_TYPE_LONG,
1126                         ATOMIC_TYPE_LONGLONG
1127                 };
1128                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1129                         if(get_atomic_type_size(possible_kinds[i]) == size) {
1130                                 kind = possible_kinds[i];
1131                                 break;
1132                         }
1133                 }
1134                 kinds[size] = kind;
1135         }
1136         return kind;
1137 }
1138
1139 /**
1140  * Find the atomic type kind representing a given size (signed).
1141  */
1142 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1143         static atomic_type_kind_t kinds[32];
1144
1145         assert(size < 32);
1146         atomic_type_kind_t kind = kinds[size];
1147         if(kind == ATOMIC_TYPE_INVALID) {
1148                 static const atomic_type_kind_t possible_kinds[] = {
1149                         ATOMIC_TYPE_UCHAR,
1150                         ATOMIC_TYPE_USHORT,
1151                         ATOMIC_TYPE_UINT,
1152                         ATOMIC_TYPE_ULONG,
1153                         ATOMIC_TYPE_ULONGLONG
1154                 };
1155                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1156                         if(get_atomic_type_size(possible_kinds[i]) == size) {
1157                                 kind = possible_kinds[i];
1158                                 break;
1159                         }
1160                 }
1161                 kinds[size] = kind;
1162         }
1163         return kind;
1164 }
1165
1166 /**
1167  * Hash the given type and return the "singleton" version
1168  * of it.
1169  */
1170 static type_t *identify_new_type(type_t *type)
1171 {
1172         type_t *result = typehash_insert(type);
1173         if(result != type) {
1174                 obstack_free(type_obst, type);
1175         }
1176         return result;
1177 }
1178
1179 /**
1180  * Creates a new atomic type.
1181  *
1182  * @param akind       The kind of the atomic type.
1183  * @param qualifiers  Type qualifiers for the new type.
1184  */
1185 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1186 {
1187         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1188         memset(type, 0, sizeof(atomic_type_t));
1189
1190         type->kind            = TYPE_ATOMIC;
1191         type->base.qualifiers = qualifiers;
1192         type->base.alignment  = get_atomic_type_alignment(akind);
1193         type->atomic.akind    = akind;
1194
1195         return identify_new_type(type);
1196 }
1197
1198 /**
1199  * Creates a new complex type.
1200  *
1201  * @param akind       The kind of the atomic type.
1202  * @param qualifiers  Type qualifiers for the new type.
1203  */
1204 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1205 {
1206         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1207         memset(type, 0, sizeof(complex_type_t));
1208
1209         type->kind            = TYPE_COMPLEX;
1210         type->base.qualifiers = qualifiers;
1211         type->base.alignment  = get_atomic_type_alignment(akind);
1212         type->complex.akind   = akind;
1213
1214         return identify_new_type(type);
1215 }
1216
1217 /**
1218  * Creates a new imaginary type.
1219  *
1220  * @param akind       The kind of the atomic type.
1221  * @param qualifiers  Type qualifiers for the new type.
1222  */
1223 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1224 {
1225         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1226         memset(type, 0, sizeof(imaginary_type_t));
1227
1228         type->kind            = TYPE_IMAGINARY;
1229         type->base.qualifiers = qualifiers;
1230         type->base.alignment  = get_atomic_type_alignment(akind);
1231         type->imaginary.akind = akind;
1232
1233         return identify_new_type(type);
1234 }
1235
1236 /**
1237  * Creates a new pointer type.
1238  *
1239  * @param points_to   The points-to type for the new type.
1240  * @param qualifiers  Type qualifiers for the new type.
1241  */
1242 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1243 {
1244         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1245         memset(type, 0, sizeof(pointer_type_t));
1246
1247         type->kind              = TYPE_POINTER;
1248         type->base.qualifiers   = qualifiers;
1249         type->base.alignment    = 0;
1250         type->pointer.points_to = points_to;
1251
1252         return identify_new_type(type);
1253 }
1254
1255 type_t *make_array_type(type_t *element_type, size_t size,
1256                         type_qualifiers_t qualifiers)
1257 {
1258         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1259         memset(type, 0, sizeof(array_type_t));
1260
1261         type->kind                = TYPE_ARRAY;
1262         type->base.qualifiers     = qualifiers;
1263         type->base.alignment      = 0;
1264         type->array.element_type  = element_type;
1265         type->array.size          = size;
1266         type->array.size_constant = true;
1267
1268         return identify_new_type(type);
1269 }
1270
1271 /**
1272  * Debug helper. Prints the given type to stdout.
1273  */
1274 static __attribute__((unused))
1275 void dbg_type(const type_t *type)
1276 {
1277         FILE *old_out = out;
1278         out = stderr;
1279         print_type(type);
1280         puts("\n");
1281         fflush(stderr);
1282         out = old_out;
1283 }