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_LONG_DOUBLE].alignment = 4;
 173         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 174         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 175
 176         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UINT];
 177 }
 178
 179 void exit_types(void)
 180 {
 181         obstack_free(type_obst, NULL);
 182 }
 183
 184 void type_set_output(FILE *stream)
 185 {
 186         out = stream;
 187 }
 188
 189 void inc_type_visited(void)
 190 {
 191         type_visited++;
 192 }
 193
 194 void print_type_qualifiers(type_qualifiers_t qualifiers)
 195 {
 196         if(qualifiers & TYPE_QUALIFIER_CONST)    fputs("const ",    out);
 197         if(qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out);
 198         if(qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out);
 199 }
 200
 201 /**
 202  * Prints the name of an atomic type kinds.
 203  *
 204  * @param kind  The type kind.
 205  */
 206 static
 207 void print_atomic_kinds(atomic_type_kind_t kind)
 208 {
 209         const char *s = "INVALIDATOMIC";
 210         switch(kind) {
 211         case ATOMIC_TYPE_INVALID:                               break;
 212         case ATOMIC_TYPE_VOID:        s = "void";               break;
 213         case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
 214         case ATOMIC_TYPE_CHAR:        s = "char";               break;
 215         case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
 216         case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
 217         case ATOMIC_TYPE_INT:         s = "int";                break;
 218         case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
 219         case ATOMIC_TYPE_SHORT:       s = "short";              break;
 220         case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
 221         case ATOMIC_TYPE_LONG:        s = "long";               break;
 222         case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
 223         case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
 224         case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
 225         case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
 226         case ATOMIC_TYPE_FLOAT:       s = "float";              break;
 227         case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
 228         }
 229         fputs(s, out);
 230 }
 231
 232 /**
 233  * Prints the name of an atomic type.
 234  *
 235  * @param type  The type.
 236  */
 237 static
 238 void print_atomic_type(const atomic_type_t *type)
 239 {
 240         print_type_qualifiers(type->base.qualifiers);
 241         print_atomic_kinds(type->akind);
 242 }
 243
 244 /**
 245  * Prints the name of a complex type.
 246  *
 247  * @param type  The type.
 248  */
 249 static
 250 void print_complex_type(const complex_type_t *type)
 251 {
 252         print_type_qualifiers(type->base.qualifiers);
 253         fputs("_Complex ", out);
 254         print_atomic_kinds(type->akind);
 255 }
 256
 257 /**
 258  * Prints the name of an imaginary type.
 259  *
 260  * @param type  The type.
 261  */
 262 static
 263 void print_imaginary_type(const imaginary_type_t *type)
 264 {
 265         print_type_qualifiers(type->base.qualifiers);
 266         fputs("_Imaginary ", out);
 267         print_atomic_kinds(type->akind);
 268 }
 269
 270 /**
 271  * Print the first part (the prefix) of a type.
 272  *
 273  * @param type   The type to print.
 274  * @param top    true, if this is the top type, false if it's an embedded type.
 275  */
 276 static void print_function_type_pre(const function_type_t *type, bool top)
 277 {
 278         print_type_qualifiers(type->base.qualifiers);
 279
 280         intern_print_type_pre(type->return_type, false);
 281
 282         /* don't emit braces if we're the toplevel type... */
 283         if(!top)
 284                 fputc('(', out);
 285 }
 286
 287 /**
 288  * Print the second part (the postfix) of a type.
 289  *
 290  * @param type   The type to print.
 291  * @param top    true, if this is the top type, false if it's an embedded type.
 292  */
 293 static void print_function_type_post(const function_type_t *type,
 294                                      const scope_t *scope, bool top)
 295 {
 296         intern_print_type_post(type->return_type, false);
 297         /* don't emit braces if we're the toplevel type... */
 298         if(!top)
 299                 fputc(')', out);
 300
 301         fputc('(', out);
 302
 303         bool first = true;
 304         if(scope == NULL) {
 305                 function_parameter_t *parameter = type->parameters;
 306                 for( ; parameter != NULL; parameter = parameter->next) {
 307                         if(first) {
 308                                 first = false;
 309                         } else {
 310                                 fputs(", ", out);
 311                         }
 312                         print_type(parameter->type);
 313                 }
 314         } else {
 315                 declaration_t *parameter = scope->declarations;
 316                 for( ; parameter != NULL; parameter = parameter->next) {
 317                         if(first) {
 318                                 first = false;
 319                         } else {
 320                                 fputs(", ", out);
 321                         }
 322                         print_type_ext(parameter->type, parameter->symbol,
 323                                        &parameter->scope);
 324                 }
 325         }
 326         if(type->variadic) {
 327                 if(first) {
 328                         first = false;
 329                 } else {
 330                         fputs(", ", out);
 331                 }
 332                 fputs("...", out);
 333         }
 334         if(first && !type->unspecified_parameters) {
 335                 fputs("void", out);
 336         }
 337         fputc(')', out);
 338 }
 339
 340 /**
 341  * Prints the prefix part of a pointer type.
 342  *
 343  * @param type   The pointer type.
 344  */
 345 static void print_pointer_type_pre(const pointer_type_t *type)
 346 {
 347         intern_print_type_pre(type->points_to, false);
 348         fputs("*", out);
 349         print_type_qualifiers(type->base.qualifiers);
 350 }
 351
 352 /**
 353  * Prints the postfix part of a pointer type.
 354  *
 355  * @param type   The pointer type.
 356  */
 357 static void print_pointer_type_post(const pointer_type_t *type)
 358 {
 359         intern_print_type_post(type->points_to, false);
 360 }
 361
 362 /**
 363  * Prints the prefix part of an array type.
 364  *
 365  * @param type   The array type.
 366  */
 367 static void print_array_type_pre(const array_type_t *type)
 368 {
 369         intern_print_type_pre(type->element_type, false);
 370 }
 371
 372 /**
 373  * Prints the postfix part of an array type.
 374  *
 375  * @param type   The array type.
 376  */
 377 static void print_array_type_post(const array_type_t *type)
 378 {
 379         fputc('[', out);
 380         if(type->is_static) {
 381                 fputs("static ", out);
 382         }
 383         print_type_qualifiers(type->base.qualifiers);
 384         if(type->size_expression != NULL
 385                         && (print_implicit_array_size || !type->has_implicit_size)) {
 386                 print_expression(type->size_expression);
 387         }
 388         fputc(']', out);
 389         intern_print_type_post(type->element_type, false);
 390 }
 391
 392 /**
 393  * Prints the postfix part of a bitfield type.
 394  *
 395  * @param type   The array type.
 396  */
 397 static void print_bitfield_type_post(const bitfield_type_t *type)
 398 {
 399         fputs(" : ", out);
 400         print_expression(type->size);
 401         intern_print_type_post(type->base_type, false);
 402 }
 403
 404 /**
 405  * Prints an enum definition.
 406  *
 407  * @param declaration  The enum's type declaration.
 408  */
 409 void print_enum_definition(const declaration_t *declaration)
 410 {
 411         fputs("{\n", out);
 412
 413         change_indent(1);
 414
 415         declaration_t *entry = declaration->next;
 416         for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
 417                entry = entry->next) {
 418
 419                 print_indent();
 420                 fprintf(out, "%s", entry->symbol->string);
 421                 if(entry->init.initializer != NULL) {
 422                         fprintf(out, " = ");
 423
 424                         /* skip the implicit cast */
 425                         expression_t *expression = entry->init.enum_value;
 426                         if(expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 427                                 expression = expression->unary.value;
 428                         }
 429                         print_expression(expression);
 430                 }
 431                 fprintf(out, ",\n");
 432         }
 433
 434         change_indent(-1);
 435         print_indent();
 436         fputs("}", out);
 437 }
 438
 439 /**
 440  * Prints an enum type.
 441  *
 442  * @param type  The enum type.
 443  */
 444 static void print_type_enum(const enum_type_t *type)
 445 {
 446         print_type_qualifiers(type->base.qualifiers);
 447         fputs("enum ", out);
 448
 449         declaration_t *declaration = type->declaration;
 450         symbol_t      *symbol      = declaration->symbol;
 451         if(symbol != NULL) {
 452                 fputs(symbol->string, out);
 453         } else {
 454                 print_enum_definition(declaration);
 455         }
 456 }
 457
 458 /**
 459  * Print the compound part of a compound type.
 460  *
 461  * @param declaration  The declaration of the compound type.
 462  */
 463 void print_compound_definition(const declaration_t *declaration)
 464 {
 465         fputs("{\n", out);
 466         change_indent(1);
 467
 468         declaration_t *iter = declaration->scope.declarations;
 469         for( ; iter != NULL; iter = iter->next) {
 470                 print_indent();
 471                 print_declaration(iter);
 472                 fputc('\n', out);
 473         }
 474
 475         change_indent(-1);
 476         print_indent();
 477         fputs("}", out);
 478 }
 479
 480 /**
 481  * Prints a compound type.
 482  *
 483  * @param type  The compound type.
 484  */
 485 static void print_compound_type(const compound_type_t *type)
 486 {
 487         print_type_qualifiers(type->base.qualifiers);
 488
 489         if(type->base.kind == TYPE_COMPOUND_STRUCT) {
 490                 fputs("struct ", out);
 491         } else {
 492                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 493                 fputs("union ", out);
 494         }
 495
 496         declaration_t *declaration = type->declaration;
 497         symbol_t      *symbol      = declaration->symbol;
 498         if(symbol != NULL) {
 499                 fputs(symbol->string, out);
 500         } else {
 501                 print_compound_definition(declaration);
 502         }
 503 }
 504
 505 /**
 506  * Prints the prefix part of a typedef type.
 507  *
 508  * @param type   The typedef type.
 509  */
 510 static void print_typedef_type_pre(const typedef_type_t *const type)
 511 {
 512         print_type_qualifiers(type->base.qualifiers);
 513         fputs(type->declaration->symbol->string, out);
 514 }
 515
 516 /**
 517  * Prints the prefix part of a typeof type.
 518  *
 519  * @param type   The typeof type.
 520  */
 521 static void print_typeof_type_pre(const typeof_type_t *const type)
 522 {
 523         fputs("typeof(", out);
 524         if(type->expression != NULL) {
 525                 assert(type->typeof_type == NULL);
 526                 print_expression(type->expression);
 527         } else {
 528                 print_type(type->typeof_type);
 529         }
 530         fputc(')', out);
 531 }
 532
 533 /**
 534  * Prints the prefix part of a type.
 535  *
 536  * @param type   The type.
 537  * @param top    true if we print the toplevel type, false else.
 538  */
 539 static void intern_print_type_pre(const type_t *const type, const bool top)
 540 {
 541         switch(type->kind) {
 542         case TYPE_ERROR:
 543                 fputs("<error>", out);
 544         case TYPE_INVALID:
 545                 fputs("<invalid>", out);
 546                 return;
 547         case TYPE_ENUM:
 548                 print_type_enum(&type->enumt);
 549                 return;
 550         case TYPE_ATOMIC:
 551                 print_atomic_type(&type->atomic);
 552                 return;
 553         case TYPE_COMPLEX:
 554                 print_complex_type(&type->complex);
 555                 return;
 556         case TYPE_IMAGINARY:
 557                 print_imaginary_type(&type->imaginary);
 558                 return;
 559         case TYPE_COMPOUND_STRUCT:
 560         case TYPE_COMPOUND_UNION:
 561                 print_compound_type(&type->compound);
 562                 return;
 563         case TYPE_BUILTIN:
 564                 fputs(type->builtin.symbol->string, out);
 565                 return;
 566         case TYPE_FUNCTION:
 567                 print_function_type_pre(&type->function, top);
 568                 return;
 569         case TYPE_POINTER:
 570                 print_pointer_type_pre(&type->pointer);
 571                 return;
 572         case TYPE_BITFIELD:
 573                 intern_print_type_pre(type->bitfield.base_type, top);
 574                 return;
 575         case TYPE_ARRAY:
 576                 print_array_type_pre(&type->array);
 577                 return;
 578         case TYPE_TYPEDEF:
 579                 print_typedef_type_pre(&type->typedeft);
 580                 return;
 581         case TYPE_TYPEOF:
 582                 print_typeof_type_pre(&type->typeoft);
 583                 return;
 584         }
 585         fputs("unknown", out);
 586 }
 587
 588 /**
 589  * Prints the postfix part of a type.
 590  *
 591  * @param type   The type.
 592  * @param top    true if we print the toplevel type, false else.
 593  */
 594 static void intern_print_type_post(const type_t *const type, const bool top)
 595 {
 596         switch(type->kind) {
 597         case TYPE_FUNCTION:
 598                 print_function_type_post(&type->function, NULL, top);
 599                 return;
 600         case TYPE_POINTER:
 601                 print_pointer_type_post(&type->pointer);
 602                 return;
 603         case TYPE_ARRAY:
 604                 print_array_type_post(&type->array);
 605                 return;
 606         case TYPE_BITFIELD:
 607                 print_bitfield_type_post(&type->bitfield);
 608                 return;
 609         case TYPE_ERROR:
 610         case TYPE_INVALID:
 611         case TYPE_ATOMIC:
 612         case TYPE_COMPLEX:
 613         case TYPE_IMAGINARY:
 614         case TYPE_ENUM:
 615         case TYPE_COMPOUND_STRUCT:
 616         case TYPE_COMPOUND_UNION:
 617         case TYPE_BUILTIN:
 618         case TYPE_TYPEOF:
 619         case TYPE_TYPEDEF:
 620                 break;
 621         }
 622 }
 623
 624 /**
 625  * Prints a type.
 626  *
 627  * @param type   The type.
 628  */
 629 void print_type(const type_t *const type)
 630 {
 631         print_type_ext(type, NULL, NULL);
 632 }
 633
 634 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 635                     const scope_t *scope)
 636 {
 637         if(type == NULL) {
 638                 fputs("nil type", out);
 639                 return;
 640         }
 641
 642         intern_print_type_pre(type, true);
 643         if(symbol != NULL) {
 644                 fputc(' ', out);
 645                 fputs(symbol->string, out);
 646         }
 647         if(type->kind == TYPE_FUNCTION) {
 648                 print_function_type_post(&type->function, scope, true);
 649         } else {
 650                 intern_print_type_post(type, true);
 651         }
 652 }
 653
 654 /**
 655  * Return the size of a type AST node.
 656  *
 657  * @param type  The type.
 658  */
 659 static size_t get_type_size(const type_t *type)
 660 {
 661         switch(type->kind) {
 662         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 663         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 664         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 665         case TYPE_COMPOUND_STRUCT:
 666         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 667         case TYPE_ENUM:            return sizeof(enum_type_t);
 668         case TYPE_FUNCTION:        return sizeof(function_type_t);
 669         case TYPE_POINTER:         return sizeof(pointer_type_t);
 670         case TYPE_ARRAY:           return sizeof(array_type_t);
 671         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 672         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 673         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 674         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 675         case TYPE_ERROR:           panic("error type found");
 676         case TYPE_INVALID:         panic("invalid type found");
 677         }
 678         panic("unknown type found");
 679 }
 680
 681 /**
 682  * Duplicates a type.
 683  *
 684  * @param type  The type to copy.
 685  * @return A copy of the type.
 686  *
 687  * @note This does not produce a deep copy!
 688  */
 689 type_t *duplicate_type(const type_t *type)
 690 {
 691         size_t size = get_type_size(type);
 692
 693         type_t *copy = obstack_alloc(type_obst, size);
 694         memcpy(copy, type, size);
 695
 696         return copy;
 697 }
 698
 699 /**
 700  * Returns the unqualified type of a given type.
 701  *
 702  * @param type  The type.
 703  * @returns The unqualified type.
 704  */
 705 type_t *get_unqualified_type(type_t *type)
 706 {
 707         if(type->base.qualifiers == TYPE_QUALIFIER_NONE)
 708                 return type;
 709
 710         type_t *unqualified_type          = duplicate_type(type);
 711         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 712
 713         type_t *result = typehash_insert(unqualified_type);
 714         if(result != unqualified_type) {
 715                 obstack_free(type_obst, unqualified_type);
 716         }
 717
 718         return result;
 719 }
 720
 721 /**
 722  * Check if a type is valid.
 723  *
 724  * @param type  The type to check.
 725  * @return true if type represents a valid type.
 726  */
 727 bool type_valid(const type_t *type)
 728 {
 729         return type->kind != TYPE_INVALID;
 730 }
 731
 732 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 733                                   atomic_type_flag_t flag)
 734 {
 735         assert(kind <= ATOMIC_TYPE_LAST);
 736         return (atomic_type_properties[kind].flags & flag) != 0;
 737 }
 738
 739 /**
 740  * Returns true if the given type is an integer type.
 741  *
 742  * @param type  The type to check.
 743  * @return True if type is an integer type.
 744  */
 745 bool is_type_integer(const type_t *type)
 746 {
 747         assert(!is_typeref(type));
 748
 749         if(type->kind == TYPE_ENUM)
 750                 return true;
 751         if(type->kind == TYPE_BITFIELD)
 752                 return true;
 753
 754         if(type->kind != TYPE_ATOMIC)
 755                 return false;
 756
 757         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 758 }
 759
 760 /**
 761  * Returns true if the given type is an floating point type.
 762  *
 763  * @param type  The type to check.
 764  * @return True if type is a floating point type.
 765  */
 766 bool is_type_float(const type_t *type)
 767 {
 768         assert(!is_typeref(type));
 769
 770         if(type->kind != TYPE_ATOMIC)
 771                 return false;
 772
 773         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 774 }
 775
 776 /**
 777  * Returns true if the given type is a signed type.
 778  *
 779  * @param type  The type to check.
 780  * @return True if type is a signed type.
 781  */
 782 bool is_type_signed(const type_t *type)
 783 {
 784         assert(!is_typeref(type));
 785
 786         /* enum types are int for now */
 787         if(type->kind == TYPE_ENUM)
 788                 return true;
 789         if(type->kind == TYPE_BITFIELD)
 790                 return is_type_signed(type->bitfield.base_type);
 791
 792         if(type->kind != TYPE_ATOMIC)
 793                 return false;
 794
 795         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 796 }
 797
 798 /**
 799  * Returns true if the given type represents an arithmetic type.
 800  *
 801  * @param type  The type to check.
 802  * @return True if type represents an arithmetic type.
 803  */
 804 bool is_type_arithmetic(const type_t *type)
 805 {
 806         assert(!is_typeref(type));
 807
 808         switch(type->kind) {
 809         case TYPE_BITFIELD:
 810         case TYPE_ENUM:
 811                 return true;
 812         case TYPE_ATOMIC:
 813                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 814         case TYPE_COMPLEX:
 815                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 816         case TYPE_IMAGINARY:
 817                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 818         default:
 819                 return false;
 820         }
 821 }
 822
 823 /**
 824  * Returns true if the given type represents a scalar type.
 825  *
 826  * @param type  The type to check.
 827  * @return True if type represents a scalar type.
 828  */
 829 bool is_type_scalar(const type_t *type)
 830 {
 831         assert(!is_typeref(type));
 832
 833         switch (type->kind) {
 834                 case TYPE_POINTER: return true;
 835                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 836                 default:           break;
 837         }
 838
 839         return is_type_arithmetic(type);
 840 }
 841
 842 /**
 843  * Check if a given type is incomplete.
 844  *
 845  * @param type  The type to check.
 846  * @return True if the given type is incomplete (ie. just forward).
 847  */
 848 bool is_type_incomplete(const type_t *type)
 849 {
 850         assert(!is_typeref(type));
 851
 852         switch(type->kind) {
 853         case TYPE_COMPOUND_STRUCT:
 854         case TYPE_COMPOUND_UNION: {
 855                 const compound_type_t *compound_type = &type->compound;
 856                 declaration_t         *declaration   = compound_type->declaration;
 857                 return !declaration->init.complete;
 858         }
 859         case TYPE_ENUM: {
 860                 const enum_type_t *enum_type   = &type->enumt;
 861                 declaration_t     *declaration = enum_type->declaration;
 862                 return !declaration->init.complete;
 863         }
 864
 865         case TYPE_ARRAY:
 866                 return type->array.size_expression == NULL
 867                         && !type->array.size_constant;
 868
 869         case TYPE_ATOMIC:
 870                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 871
 872         case TYPE_COMPLEX:
 873                 return type->complex.akind == ATOMIC_TYPE_VOID;
 874
 875         case TYPE_IMAGINARY:
 876                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 877
 878         case TYPE_BITFIELD:
 879         case TYPE_FUNCTION:
 880         case TYPE_POINTER:
 881         case TYPE_BUILTIN:
 882         case TYPE_ERROR:
 883                 return false;
 884
 885         case TYPE_TYPEDEF:
 886         case TYPE_TYPEOF:
 887                 panic("is_type_incomplete called without typerefs skipped");
 888         case TYPE_INVALID:
 889                 break;
 890         }
 891
 892         panic("invalid type found");
 893 }
 894
 895 /**
 896  * Check if two function types are compatible.
 897  */
 898 static bool function_types_compatible(const function_type_t *func1,
 899                                       const function_type_t *func2)
 900 {
 901         const type_t* const ret1 = skip_typeref(func1->return_type);
 902         const type_t* const ret2 = skip_typeref(func2->return_type);
 903         if (!types_compatible(ret1, ret2))
 904                 return false;
 905
 906         /* can parameters be compared? */
 907         if (func1->unspecified_parameters || func2->unspecified_parameters)
 908                 return true;
 909
 910         if (func1->variadic != func2->variadic)
 911                 return false;
 912
 913         /* TODO: handling of unspecified parameters not correct yet */
 914
 915         /* all argument types must be compatible */
 916         function_parameter_t *parameter1 = func1->parameters;
 917         function_parameter_t *parameter2 = func2->parameters;
 918         for ( ; parameter1 != NULL && parameter2 != NULL;
 919                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 920                 type_t *parameter1_type = skip_typeref(parameter1->type);
 921                 type_t *parameter2_type = skip_typeref(parameter2->type);
 922
 923                 parameter1_type = get_unqualified_type(parameter1_type);
 924                 parameter2_type = get_unqualified_type(parameter2_type);
 925
 926                 if (!types_compatible(parameter1_type, parameter2_type))
 927                         return false;
 928         }
 929         /* same number of arguments? */
 930         if (parameter1 != NULL || parameter2 != NULL)
 931                 return false;
 932
 933         return true;
 934 }
 935
 936 /**
 937  * Check if two array types are compatible.
 938  */
 939 static bool array_types_compatible(const array_type_t *array1,
 940                                    const array_type_t *array2)
 941 {
 942         type_t *element_type1 = skip_typeref(array1->element_type);
 943         type_t *element_type2 = skip_typeref(array2->element_type);
 944         if(!types_compatible(element_type1, element_type2))
 945                 return false;
 946
 947         if(!array1->size_constant || !array2->size_constant)
 948                 return true;
 949
 950         return array1->size == array2->size;
 951 }
 952
 953 /**
 954  * Check if two types are compatible.
 955  */
 956 bool types_compatible(const type_t *type1, const type_t *type2)
 957 {
 958         assert(!is_typeref(type1));
 959         assert(!is_typeref(type2));
 960
 961         /* shortcut: the same type is always compatible */
 962         if(type1 == type2)
 963                 return true;
 964
 965         if(type1->base.qualifiers != type2->base.qualifiers)
 966                 return false;
 967         if(type1->kind != type2->kind)
 968                 return false;
 969
 970         switch(type1->kind) {
 971         case TYPE_FUNCTION:
 972                 return function_types_compatible(&type1->function, &type2->function);
 973         case TYPE_ATOMIC:
 974                 return type1->atomic.akind == type2->atomic.akind;
 975         case TYPE_COMPLEX:
 976                 return type1->complex.akind == type2->complex.akind;
 977         case TYPE_IMAGINARY:
 978                 return type1->imaginary.akind == type2->imaginary.akind;
 979         case TYPE_ARRAY:
 980                 return array_types_compatible(&type1->array, &type2->array);
 981
 982         case TYPE_POINTER: {
 983                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
 984                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
 985                 return types_compatible(to1, to2);
 986         }
 987
 988         case TYPE_COMPOUND_STRUCT:
 989         case TYPE_COMPOUND_UNION:
 990         case TYPE_ENUM:
 991         case TYPE_BUILTIN:
 992                 /* TODO: not implemented */
 993                 break;
 994
 995         case TYPE_BITFIELD:
 996                 /* not sure if this makes sense or is even needed, implement it if you
 997                  * really need it! */
 998                 panic("type compatibility check for bitfield type");
 999
1000         case TYPE_ERROR:
1001                 /* Hmm, the error type should be compatible to all other types */
1002                 return true;
1003         case TYPE_INVALID:
1004                 panic("invalid type found in compatible types");
1005         case TYPE_TYPEDEF:
1006         case TYPE_TYPEOF:
1007                 panic("typerefs not skipped in compatible types?!?");
1008         }
1009
1010         /* TODO: incomplete */
1011         return false;
1012 }
1013
1014 /**
1015  * Check if two pointer types are compatible.
1016  */
1017 bool pointers_compatible(const type_t *type1, const type_t *type2)
1018 {
1019         assert(!is_typeref(type1));
1020         assert(!is_typeref(type2));
1021
1022         assert(type1->kind == TYPE_POINTER);
1023         assert(type2->kind == TYPE_POINTER);
1024         (void) type1;
1025         (void) type2;
1026         /* TODO */
1027         return true;
1028 }
1029
1030 /**
1031  * Skip all typerefs and return the underlying type.
1032  */
1033 type_t *skip_typeref(type_t *type)
1034 {
1035         unsigned qualifiers = TYPE_QUALIFIER_NONE;
1036
1037         while(true) {
1038                 switch(type->kind) {
1039                 case TYPE_ERROR:
1040                         return type;
1041                 case TYPE_TYPEDEF: {
1042                         qualifiers |= type->base.qualifiers;
1043                         const typedef_type_t *typedef_type = &type->typedeft;
1044                         if(typedef_type->resolved_type != NULL) {
1045                                 type = typedef_type->resolved_type;
1046                                 break;
1047                         }
1048                         type = typedef_type->declaration->type;
1049                         continue;
1050                 }
1051                 case TYPE_TYPEOF: {
1052                         const typeof_type_t *typeof_type = &type->typeoft;
1053                         if(typeof_type->typeof_type != NULL) {
1054                                 type = typeof_type->typeof_type;
1055                         } else {
1056                                 type = typeof_type->expression->base.type;
1057                         }
1058                         continue;
1059                 }
1060                 default:
1061                         break;
1062                 }
1063                 break;
1064         }
1065
1066         if (qualifiers != TYPE_QUALIFIER_NONE) {
1067                 type_t *const copy     = duplicate_type(type);
1068                 copy->base.qualifiers |= qualifiers;
1069
1070                 type = typehash_insert(copy);
1071                 if (type != copy) {
1072                         obstack_free(type_obst, copy);
1073                 }
1074         }
1075
1076         return type;
1077 }
1078
1079 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1080 {
1081         assert(kind <= ATOMIC_TYPE_LAST);
1082         return atomic_type_properties[kind].size;
1083 }
1084
1085 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1086 {
1087         assert(kind <= ATOMIC_TYPE_LAST);
1088         return atomic_type_properties[kind].alignment;
1089 }
1090
1091 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1092 {
1093         assert(kind <= ATOMIC_TYPE_LAST);
1094         return atomic_type_properties[kind].flags;
1095 }
1096
1097 atomic_type_kind_t get_intptr_kind(void)
1098 {
1099         if(machine_size <= 32)
1100                 return ATOMIC_TYPE_INT;
1101         else if(machine_size <= 64)
1102                 return ATOMIC_TYPE_LONG;
1103         else
1104                 return ATOMIC_TYPE_LONGLONG;
1105 }
1106
1107 atomic_type_kind_t get_uintptr_kind(void)
1108 {
1109         if(machine_size <= 32)
1110                 return ATOMIC_TYPE_UINT;
1111         else if(machine_size <= 64)
1112                 return ATOMIC_TYPE_ULONG;
1113         else
1114                 return ATOMIC_TYPE_ULONGLONG;
1115 }
1116
1117 /**
1118  * Find the atomic type kind representing a given size (signed).
1119  */
1120 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1121         static atomic_type_kind_t kinds[32];
1122
1123         assert(size < 32);
1124         atomic_type_kind_t kind = kinds[size];
1125         if(kind == ATOMIC_TYPE_INVALID) {
1126                 static const atomic_type_kind_t possible_kinds[] = {
1127                         ATOMIC_TYPE_SCHAR,
1128                         ATOMIC_TYPE_SHORT,
1129                         ATOMIC_TYPE_INT,
1130                         ATOMIC_TYPE_LONG,
1131                         ATOMIC_TYPE_LONGLONG
1132                 };
1133                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1134                         if(get_atomic_type_size(possible_kinds[i]) == size) {
1135                                 kind = possible_kinds[i];
1136                                 break;
1137                         }
1138                 }
1139                 kinds[size] = kind;
1140         }
1141         return kind;
1142 }
1143
1144 /**
1145  * Find the atomic type kind representing a given size (signed).
1146  */
1147 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1148         static atomic_type_kind_t kinds[32];
1149
1150         assert(size < 32);
1151         atomic_type_kind_t kind = kinds[size];
1152         if(kind == ATOMIC_TYPE_INVALID) {
1153                 static const atomic_type_kind_t possible_kinds[] = {
1154                         ATOMIC_TYPE_UCHAR,
1155                         ATOMIC_TYPE_USHORT,
1156                         ATOMIC_TYPE_UINT,
1157                         ATOMIC_TYPE_ULONG,
1158                         ATOMIC_TYPE_ULONGLONG
1159                 };
1160                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1161                         if(get_atomic_type_size(possible_kinds[i]) == size) {
1162                                 kind = possible_kinds[i];
1163                                 break;
1164                         }
1165                 }
1166                 kinds[size] = kind;
1167         }
1168         return kind;
1169 }
1170
1171 /**
1172  * Hash the given type and return the "singleton" version
1173  * of it.
1174  */
1175 static type_t *identify_new_type(type_t *type)
1176 {
1177         type_t *result = typehash_insert(type);
1178         if(result != type) {
1179                 obstack_free(type_obst, type);
1180         }
1181         return result;
1182 }
1183
1184 /**
1185  * Creates a new atomic type.
1186  *
1187  * @param akind       The kind of the atomic type.
1188  * @param qualifiers  Type qualifiers for the new type.
1189  */
1190 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1191 {
1192         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1193         memset(type, 0, sizeof(atomic_type_t));
1194
1195         type->kind            = TYPE_ATOMIC;
1196         type->base.qualifiers = qualifiers;
1197         type->base.alignment  = get_atomic_type_alignment(akind);
1198         type->atomic.akind    = akind;
1199
1200         return identify_new_type(type);
1201 }
1202
1203 /**
1204  * Creates a new complex type.
1205  *
1206  * @param akind       The kind of the atomic type.
1207  * @param qualifiers  Type qualifiers for the new type.
1208  */
1209 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1210 {
1211         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1212         memset(type, 0, sizeof(complex_type_t));
1213
1214         type->kind            = TYPE_COMPLEX;
1215         type->base.qualifiers = qualifiers;
1216         type->base.alignment  = get_atomic_type_alignment(akind);
1217         type->complex.akind   = akind;
1218
1219         return identify_new_type(type);
1220 }
1221
1222 /**
1223  * Creates a new imaginary type.
1224  *
1225  * @param akind       The kind of the atomic type.
1226  * @param qualifiers  Type qualifiers for the new type.
1227  */
1228 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1229 {
1230         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1231         memset(type, 0, sizeof(imaginary_type_t));
1232
1233         type->kind            = TYPE_IMAGINARY;
1234         type->base.qualifiers = qualifiers;
1235         type->base.alignment  = get_atomic_type_alignment(akind);
1236         type->imaginary.akind = akind;
1237
1238         return identify_new_type(type);
1239 }
1240
1241 /**
1242  * Creates a new pointer type.
1243  *
1244  * @param points_to   The points-to type for the new type.
1245  * @param qualifiers  Type qualifiers for the new type.
1246  */
1247 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1248 {
1249         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1250         memset(type, 0, sizeof(pointer_type_t));
1251
1252         type->kind              = TYPE_POINTER;
1253         type->base.qualifiers   = qualifiers;
1254         type->base.alignment    = 0;
1255         type->pointer.points_to = points_to;
1256
1257         return identify_new_type(type);
1258 }
1259
1260 type_t *make_array_type(type_t *element_type, size_t size,
1261                         type_qualifiers_t qualifiers)
1262 {
1263         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1264         memset(type, 0, sizeof(array_type_t));
1265
1266         type->kind                = TYPE_ARRAY;
1267         type->base.qualifiers     = qualifiers;
1268         type->base.alignment      = 0;
1269         type->array.element_type  = element_type;
1270         type->array.size          = size;
1271         type->array.size_constant = true;
1272
1273         return identify_new_type(type);
1274 }
1275
1276 /**
1277  * Debug helper. Prints the given type to stdout.
1278  */
1279 static __attribute__((unused))
1280 void dbg_type(const type_t *type)
1281 {
1282         FILE *old_out = out;
1283         out = stderr;
1284         print_type(type);
1285         puts("\n");
1286         fflush(stderr);
1287         out = old_out;
1288 }