nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 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 "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36 #include "driver/firm_cmdline.h"
  37
  38 /** The default calling convention. */
  39 cc_kind_t default_calling_convention = CC_CDECL;
  40
  41 static struct obstack   _type_obst;
  42 struct obstack         *type_obst                 = &_type_obst;
  43 static bool             print_implicit_array_size = false;
  44
  45 static void intern_print_type_pre(const type_t *type);
  46 static void intern_print_type_post(const type_t *type);
  47
  48 typedef struct atomic_type_properties_t atomic_type_properties_t;
  49 struct atomic_type_properties_t {
  50         unsigned   size;              /**< type size in bytes */
  51         unsigned   alignment;         /**< type alignment in bytes */
  52         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  53 };
  54
  55 /**
  56  * Properties of atomic types.
  57  */
  58 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  59         //ATOMIC_TYPE_INVALID = 0,
  60         [ATOMIC_TYPE_VOID] = {
  61                 .size       = 0,
  62                 .alignment  = 0,
  63                 .flags      = ATOMIC_TYPE_FLAG_NONE
  64         },
  65         [ATOMIC_TYPE_WCHAR_T] = {
  66                 .size       = (unsigned)-1,
  67                 .alignment  = (unsigned)-1,
  68                 /* signed flag will be set when known */
  69                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  70         },
  71         [ATOMIC_TYPE_CHAR] = {
  72                 .size       = 1,
  73                 .alignment  = 1,
  74                 /* signed flag will be set when known */
  75                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  76         },
  77         [ATOMIC_TYPE_SCHAR] = {
  78                 .size       = 1,
  79                 .alignment  = 1,
  80                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  81                               | ATOMIC_TYPE_FLAG_SIGNED,
  82         },
  83         [ATOMIC_TYPE_UCHAR] = {
  84                 .size       = 1,
  85                 .alignment  = 1,
  86                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  87         },
  88         [ATOMIC_TYPE_SHORT] = {
  89                 .size       = 2,
  90                 .alignment  = 2,
  91                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  92                               | ATOMIC_TYPE_FLAG_SIGNED
  93         },
  94         [ATOMIC_TYPE_USHORT] = {
  95                 .size       = 2,
  96                 .alignment  = 2,
  97                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  98         },
  99         [ATOMIC_TYPE_INT] = {
 100                 .size       = (unsigned) -1,
 101                 .alignment  = (unsigned) -1,
 102                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 103                               | ATOMIC_TYPE_FLAG_SIGNED,
 104         },
 105         [ATOMIC_TYPE_UINT] = {
 106                 .size       = (unsigned) -1,
 107                 .alignment  = (unsigned) -1,
 108                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 109         },
 110         [ATOMIC_TYPE_LONG] = {
 111                 .size       = (unsigned) -1,
 112                 .alignment  = (unsigned) -1,
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 114                               | ATOMIC_TYPE_FLAG_SIGNED,
 115         },
 116         [ATOMIC_TYPE_ULONG] = {
 117                 .size       = (unsigned) -1,
 118                 .alignment  = (unsigned) -1,
 119                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 120         },
 121         [ATOMIC_TYPE_LONGLONG] = {
 122                 .size       = (unsigned) -1,
 123                 .alignment  = (unsigned) -1,
 124                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 125                               | ATOMIC_TYPE_FLAG_SIGNED,
 126         },
 127         [ATOMIC_TYPE_ULONGLONG] = {
 128                 .size       = (unsigned) -1,
 129                 .alignment  = (unsigned) -1,
 130                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 131         },
 132         [ATOMIC_TYPE_BOOL] = {
 133                 .size       = (unsigned) -1,
 134                 .alignment  = (unsigned) -1,
 135                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 136         },
 137         [ATOMIC_TYPE_FLOAT] = {
 138                 .size       = 4,
 139                 .alignment  = (unsigned) -1,
 140                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 141                               | ATOMIC_TYPE_FLAG_SIGNED,
 142         },
 143         [ATOMIC_TYPE_DOUBLE] = {
 144                 .size       = 8,
 145                 .alignment  = (unsigned) -1,
 146                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 147                               | ATOMIC_TYPE_FLAG_SIGNED,
 148         },
 149         [ATOMIC_TYPE_LONG_DOUBLE] = {
 150                 .size       = 12,
 151                 .alignment  = (unsigned) -1,
 152                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 153                               | ATOMIC_TYPE_FLAG_SIGNED,
 154         },
 155         /* complex and imaginary types are set in init_types */
 156 };
 157
 158 void init_types(void)
 159 {
 160         obstack_init(type_obst);
 161
 162         atomic_type_properties_t *props = atomic_type_properties;
 163
 164         if (char_is_signed) {
 165                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 166         }
 167
 168         unsigned int_size   = machine_size < 32 ? 2 : 4;
 169         unsigned long_size  = machine_size < 64 ? 4 : 8;
 170         unsigned llong_size = machine_size < 32 ? 4 : 8;
 171
 172         props[ATOMIC_TYPE_INT].size            = int_size;
 173         props[ATOMIC_TYPE_INT].alignment       = int_size;
 174         props[ATOMIC_TYPE_UINT].size           = int_size;
 175         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 176         props[ATOMIC_TYPE_LONG].size           = long_size;
 177         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 178         props[ATOMIC_TYPE_ULONG].size          = long_size;
 179         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 180         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 181         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 182         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 183         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 184
 185         /* TODO: backend specific, need a way to query the backend for this.
 186          * The following are good settings for x86 */
 187         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 188         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 189         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 190         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 191         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 192         if (firm_opt.os_support == OS_SUPPORT_MACHO) {
 193                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = 16;
 194                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 16;
 195         }
 196
 197         /* TODO: make this configurable for platforms which do not use byte sized
 198          * bools. */
 199         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 200
 201         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 202 }
 203
 204 void exit_types(void)
 205 {
 206         obstack_free(type_obst, NULL);
 207 }
 208
 209 void print_type_qualifiers(type_qualifiers_t qualifiers)
 210 {
 211         if (qualifiers & TYPE_QUALIFIER_CONST) {
 212                 print_string("const ");
 213         }
 214         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 215                 print_string("volatile ");
 216         }
 217         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 218                 print_string("restrict ");
 219         }
 220 }
 221
 222 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 223 {
 224         switch(kind) {
 225         case ATOMIC_TYPE_INVALID: break;
 226         case ATOMIC_TYPE_VOID:        return "void";
 227         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 228         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 229         case ATOMIC_TYPE_CHAR:        return "char";
 230         case ATOMIC_TYPE_SCHAR:       return "signed char";
 231         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 232         case ATOMIC_TYPE_INT:         return "int";
 233         case ATOMIC_TYPE_UINT:        return "unsigned int";
 234         case ATOMIC_TYPE_SHORT:       return "short";
 235         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 236         case ATOMIC_TYPE_LONG:        return "long";
 237         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 238         case ATOMIC_TYPE_LONGLONG:    return "long long";
 239         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 240         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 241         case ATOMIC_TYPE_FLOAT:       return "float";
 242         case ATOMIC_TYPE_DOUBLE:      return "double";
 243         }
 244         return "INVALIDATOMIC";
 245 }
 246
 247 /**
 248  * Prints the name of an atomic type kinds.
 249  *
 250  * @param kind  The type kind.
 251  */
 252 static void print_atomic_kinds(atomic_type_kind_t kind)
 253 {
 254         const char *s = get_atomic_kind_name(kind);
 255         print_string(s);
 256 }
 257
 258 /**
 259  * Prints the name of an atomic type.
 260  *
 261  * @param type  The type.
 262  */
 263 static void print_atomic_type(const atomic_type_t *type)
 264 {
 265         print_type_qualifiers(type->base.qualifiers);
 266         print_atomic_kinds(type->akind);
 267 }
 268
 269 /**
 270  * Prints the name of a complex type.
 271  *
 272  * @param type  The type.
 273  */
 274 static void print_complex_type(const complex_type_t *type)
 275 {
 276         print_type_qualifiers(type->base.qualifiers);
 277         print_string("_Complex");
 278         print_atomic_kinds(type->akind);
 279 }
 280
 281 /**
 282  * Prints the name of an imaginary type.
 283  *
 284  * @param type  The type.
 285  */
 286 static void print_imaginary_type(const imaginary_type_t *type)
 287 {
 288         print_type_qualifiers(type->base.qualifiers);
 289         print_string("_Imaginary ");
 290         print_atomic_kinds(type->akind);
 291 }
 292
 293 /**
 294  * Print the first part (the prefix) of a type.
 295  *
 296  * @param type   The type to print.
 297  */
 298 static void print_function_type_pre(const function_type_t *type)
 299 {
 300         switch (type->linkage) {
 301                 case LINKAGE_INVALID:
 302                         break;
 303
 304                 case LINKAGE_C:
 305                         if (c_mode & _CXX)
 306                                 print_string("extern \"C\" ");
 307                         break;
 308
 309                 case LINKAGE_CXX:
 310                         if (!(c_mode & _CXX))
 311                                 print_string("extern \"C++\" ");
 312                         break;
 313         }
 314
 315         print_type_qualifiers(type->base.qualifiers);
 316
 317         intern_print_type_pre(type->return_type);
 318
 319         cc_kind_t cc = type->calling_convention;
 320 restart:
 321         switch (cc) {
 322         case CC_CDECL:    print_string(" __cdecl");    break;
 323         case CC_STDCALL:  print_string(" __stdcall");  break;
 324         case CC_FASTCALL: print_string(" __fastcall"); break;
 325         case CC_THISCALL: print_string(" __thiscall"); break;
 326         case CC_DEFAULT:
 327                 if (default_calling_convention != CC_CDECL) {
 328                         /* show the default calling convention if its not cdecl */
 329                         cc = default_calling_convention;
 330                         goto restart;
 331                 }
 332                 break;
 333         }
 334 }
 335
 336 /**
 337  * Print the second part (the postfix) of a type.
 338  *
 339  * @param type   The type to print.
 340  */
 341 static void print_function_type_post(const function_type_t *type,
 342                                      const scope_t *parameters)
 343 {
 344         print_string("(");
 345         bool first = true;
 346         if (parameters == NULL) {
 347                 function_parameter_t *parameter = type->parameters;
 348                 for( ; parameter != NULL; parameter = parameter->next) {
 349                         if (first) {
 350                                 first = false;
 351                         } else {
 352                                 print_string(", ");
 353                         }
 354                         print_type(parameter->type);
 355                 }
 356         } else {
 357                 entity_t *parameter = parameters->entities;
 358                 for (; parameter != NULL; parameter = parameter->base.next) {
 359                         if (parameter->kind != ENTITY_PARAMETER)
 360                                 continue;
 361
 362                         if (first) {
 363                                 first = false;
 364                         } else {
 365                                 print_string(", ");
 366                         }
 367                         const type_t *const type = parameter->declaration.type;
 368                         if (type == NULL) {
 369                                 print_string(parameter->base.symbol->string);
 370                         } else {
 371                                 print_type_ext(type, parameter->base.symbol, NULL);
 372                         }
 373                 }
 374         }
 375         if (type->variadic) {
 376                 if (first) {
 377                         first = false;
 378                 } else {
 379                         print_string(", ");
 380                 }
 381                 print_string("...");
 382         }
 383         if (first && !type->unspecified_parameters) {
 384                 print_string("void");
 385         }
 386         print_string(")");
 387
 388         intern_print_type_post(type->return_type);
 389 }
 390
 391 /**
 392  * Prints the prefix part of a pointer type.
 393  *
 394  * @param type   The pointer type.
 395  */
 396 static void print_pointer_type_pre(const pointer_type_t *type)
 397 {
 398         type_t const *const points_to = type->points_to;
 399         intern_print_type_pre(points_to);
 400         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 401                 print_string(" (");
 402         variable_t *const variable = type->base_variable;
 403         if (variable != NULL) {
 404                 print_string(" __based(");
 405                 print_string(variable->base.base.symbol->string);
 406                 print_string(") ");
 407         }
 408         print_string("*");
 409         type_qualifiers_t const qual = type->base.qualifiers;
 410         if (qual != 0)
 411                 print_string(" ");
 412         print_type_qualifiers(qual);
 413 }
 414
 415 /**
 416  * Prints the postfix part of a pointer type.
 417  *
 418  * @param type   The pointer type.
 419  */
 420 static void print_pointer_type_post(const pointer_type_t *type)
 421 {
 422         type_t const *const points_to = type->points_to;
 423         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 424                 print_string(")");
 425         intern_print_type_post(points_to);
 426 }
 427
 428 /**
 429  * Prints the prefix part of a reference type.
 430  *
 431  * @param type   The reference type.
 432  */
 433 static void print_reference_type_pre(const reference_type_t *type)
 434 {
 435         type_t const *const refers_to = type->refers_to;
 436         intern_print_type_pre(refers_to);
 437         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 438                 print_string(" (");
 439         print_string("&");
 440 }
 441
 442 /**
 443  * Prints the postfix part of a reference type.
 444  *
 445  * @param type   The reference type.
 446  */
 447 static void print_reference_type_post(const reference_type_t *type)
 448 {
 449         type_t const *const refers_to = type->refers_to;
 450         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 451                 print_string(")");
 452         intern_print_type_post(refers_to);
 453 }
 454
 455 /**
 456  * Prints the prefix part of an array type.
 457  *
 458  * @param type   The array type.
 459  */
 460 static void print_array_type_pre(const array_type_t *type)
 461 {
 462         intern_print_type_pre(type->element_type);
 463 }
 464
 465 /**
 466  * Prints the postfix part of an array type.
 467  *
 468  * @param type   The array type.
 469  */
 470 static void print_array_type_post(const array_type_t *type)
 471 {
 472         print_string("[");
 473         if (type->is_static) {
 474                 print_string("static ");
 475         }
 476         print_type_qualifiers(type->base.qualifiers);
 477         if (type->size_expression != NULL
 478                         && (print_implicit_array_size || !type->has_implicit_size)) {
 479                 print_expression(type->size_expression);
 480         }
 481         print_string("]");
 482         intern_print_type_post(type->element_type);
 483 }
 484
 485 /**
 486  * Prints the postfix part of a bitfield type.
 487  *
 488  * @param type   The array type.
 489  */
 490 static void print_bitfield_type_post(const bitfield_type_t *type)
 491 {
 492         print_string(" : ");
 493         print_expression(type->size_expression);
 494         intern_print_type_post(type->base_type);
 495 }
 496
 497 /**
 498  * Prints an enum definition.
 499  *
 500  * @param declaration  The enum's type declaration.
 501  */
 502 void print_enum_definition(const enum_t *enume)
 503 {
 504         print_string("{\n");
 505
 506         change_indent(1);
 507
 508         entity_t *entry = enume->base.next;
 509         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 510                entry = entry->base.next) {
 511
 512                 print_indent();
 513                 print_string(entry->base.symbol->string);
 514                 if (entry->enum_value.value != NULL) {
 515                         print_string(" = ");
 516
 517                         /* skip the implicit cast */
 518                         expression_t *expression = entry->enum_value.value;
 519                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 520                                 expression = expression->unary.value;
 521                         }
 522                         print_expression(expression);
 523                 }
 524                 print_string(",\n");
 525         }
 526
 527         change_indent(-1);
 528         print_indent();
 529         print_string("}");
 530 }
 531
 532 /**
 533  * Prints an enum type.
 534  *
 535  * @param type  The enum type.
 536  */
 537 static void print_type_enum(const enum_type_t *type)
 538 {
 539         print_type_qualifiers(type->base.qualifiers);
 540         print_string("enum ");
 541
 542         enum_t   *enume  = type->enume;
 543         symbol_t *symbol = enume->base.symbol;
 544         if (symbol != NULL) {
 545                 print_string(symbol->string);
 546         } else {
 547                 print_enum_definition(enume);
 548         }
 549 }
 550
 551 /**
 552  * Print the compound part of a compound type.
 553  */
 554 void print_compound_definition(const compound_t *compound)
 555 {
 556         print_string("{\n");
 557         change_indent(1);
 558
 559         entity_t *entity = compound->members.entities;
 560         for( ; entity != NULL; entity = entity->base.next) {
 561                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 562                         continue;
 563
 564                 print_indent();
 565                 print_entity(entity);
 566                 print_string("\n");
 567         }
 568
 569         change_indent(-1);
 570         print_indent();
 571         print_string("}");
 572         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 573                 print_string("__attribute__((__transparent_union__))");
 574         }
 575 }
 576
 577 /**
 578  * Prints a compound type.
 579  *
 580  * @param type  The compound type.
 581  */
 582 static void print_compound_type(const compound_type_t *type)
 583 {
 584         print_type_qualifiers(type->base.qualifiers);
 585
 586         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 587                 print_string("struct ");
 588         } else {
 589                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 590                 print_string("union ");
 591         }
 592
 593         compound_t *compound = type->compound;
 594         symbol_t   *symbol   = compound->base.symbol;
 595         if (symbol != NULL) {
 596                 print_string(symbol->string);
 597         } else {
 598                 print_compound_definition(compound);
 599         }
 600 }
 601
 602 /**
 603  * Prints the prefix part of a typedef type.
 604  *
 605  * @param type   The typedef type.
 606  */
 607 static void print_typedef_type_pre(const typedef_type_t *const type)
 608 {
 609         print_type_qualifiers(type->base.qualifiers);
 610         print_string(type->typedefe->base.symbol->string);
 611 }
 612
 613 /**
 614  * Prints the prefix part of a typeof type.
 615  *
 616  * @param type   The typeof type.
 617  */
 618 static void print_typeof_type_pre(const typeof_type_t *const type)
 619 {
 620         print_string("typeof(");
 621         if (type->expression != NULL) {
 622                 print_expression(type->expression);
 623         } else {
 624                 print_type(type->typeof_type);
 625         }
 626         print_string(")");
 627 }
 628
 629 /**
 630  * Prints the prefix part of a type.
 631  *
 632  * @param type   The type.
 633  */
 634 static void intern_print_type_pre(const type_t *const type)
 635 {
 636         switch(type->kind) {
 637         case TYPE_ERROR:
 638                 print_string("<error>");
 639                 return;
 640         case TYPE_INVALID:
 641                 print_string("<invalid>");
 642                 return;
 643         case TYPE_ENUM:
 644                 print_type_enum(&type->enumt);
 645                 return;
 646         case TYPE_ATOMIC:
 647                 print_atomic_type(&type->atomic);
 648                 return;
 649         case TYPE_COMPLEX:
 650                 print_complex_type(&type->complex);
 651                 return;
 652         case TYPE_IMAGINARY:
 653                 print_imaginary_type(&type->imaginary);
 654                 return;
 655         case TYPE_COMPOUND_STRUCT:
 656         case TYPE_COMPOUND_UNION:
 657                 print_compound_type(&type->compound);
 658                 return;
 659         case TYPE_BUILTIN:
 660                 print_string(type->builtin.symbol->string);
 661                 return;
 662         case TYPE_FUNCTION:
 663                 print_function_type_pre(&type->function);
 664                 return;
 665         case TYPE_POINTER:
 666                 print_pointer_type_pre(&type->pointer);
 667                 return;
 668         case TYPE_REFERENCE:
 669                 print_reference_type_pre(&type->reference);
 670                 return;
 671         case TYPE_BITFIELD:
 672                 intern_print_type_pre(type->bitfield.base_type);
 673                 return;
 674         case TYPE_ARRAY:
 675                 print_array_type_pre(&type->array);
 676                 return;
 677         case TYPE_TYPEDEF:
 678                 print_typedef_type_pre(&type->typedeft);
 679                 return;
 680         case TYPE_TYPEOF:
 681                 print_typeof_type_pre(&type->typeoft);
 682                 return;
 683         }
 684         print_string("unknown");
 685 }
 686
 687 /**
 688  * Prints the postfix part of a type.
 689  *
 690  * @param type   The type.
 691  */
 692 static void intern_print_type_post(const type_t *const type)
 693 {
 694         switch(type->kind) {
 695         case TYPE_FUNCTION:
 696                 print_function_type_post(&type->function, NULL);
 697                 return;
 698         case TYPE_POINTER:
 699                 print_pointer_type_post(&type->pointer);
 700                 return;
 701         case TYPE_REFERENCE:
 702                 print_reference_type_post(&type->reference);
 703                 return;
 704         case TYPE_ARRAY:
 705                 print_array_type_post(&type->array);
 706                 return;
 707         case TYPE_BITFIELD:
 708                 print_bitfield_type_post(&type->bitfield);
 709                 return;
 710         case TYPE_ERROR:
 711         case TYPE_INVALID:
 712         case TYPE_ATOMIC:
 713         case TYPE_COMPLEX:
 714         case TYPE_IMAGINARY:
 715         case TYPE_ENUM:
 716         case TYPE_COMPOUND_STRUCT:
 717         case TYPE_COMPOUND_UNION:
 718         case TYPE_BUILTIN:
 719         case TYPE_TYPEOF:
 720         case TYPE_TYPEDEF:
 721                 break;
 722         }
 723 }
 724
 725 /**
 726  * Prints a type.
 727  *
 728  * @param type   The type.
 729  */
 730 void print_type(const type_t *const type)
 731 {
 732         print_type_ext(type, NULL, NULL);
 733 }
 734
 735 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 736                     const scope_t *parameters)
 737 {
 738         if (type == NULL) {
 739                 print_string("nil type");
 740                 return;
 741         }
 742
 743         intern_print_type_pre(type);
 744         if (symbol != NULL) {
 745                 print_string(" ");
 746                 print_string(symbol->string);
 747         }
 748         if (type->kind == TYPE_FUNCTION) {
 749                 print_function_type_post(&type->function, parameters);
 750         } else {
 751                 intern_print_type_post(type);
 752         }
 753 }
 754
 755 /**
 756  * Return the size of a type AST node.
 757  *
 758  * @param type  The type.
 759  */
 760 static size_t get_type_struct_size(const type_t *type)
 761 {
 762         switch(type->kind) {
 763         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 764         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 765         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 766         case TYPE_COMPOUND_STRUCT:
 767         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 768         case TYPE_ENUM:            return sizeof(enum_type_t);
 769         case TYPE_FUNCTION:        return sizeof(function_type_t);
 770         case TYPE_POINTER:         return sizeof(pointer_type_t);
 771         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 772         case TYPE_ARRAY:           return sizeof(array_type_t);
 773         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 774         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 775         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 776         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 777         case TYPE_ERROR:           panic("error type found");
 778         case TYPE_INVALID:         panic("invalid type found");
 779         }
 780         panic("unknown type found");
 781 }
 782
 783 /**
 784  * Duplicates a type.
 785  *
 786  * @param type  The type to copy.
 787  * @return A copy of the type.
 788  *
 789  * @note This does not produce a deep copy!
 790  */
 791 type_t *duplicate_type(const type_t *type)
 792 {
 793         size_t size = get_type_struct_size(type);
 794
 795         type_t *copy = obstack_alloc(type_obst, size);
 796         memcpy(copy, type, size);
 797         copy->base.firm_type = NULL;
 798
 799         return copy;
 800 }
 801
 802 /**
 803  * Returns the unqualified type of a given type.
 804  *
 805  * @param type  The type.
 806  * @returns The unqualified type.
 807  */
 808 type_t *get_unqualified_type(type_t *type)
 809 {
 810         assert(!is_typeref(type));
 811
 812         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 813                 return type;
 814
 815         type_t *unqualified_type          = duplicate_type(type);
 816         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 817
 818         return identify_new_type(unqualified_type);
 819 }
 820
 821 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 822 {
 823         type_t *type = skip_typeref(orig_type);
 824
 825         type_t *copy;
 826         if (is_type_array(type)) {
 827                 /* For array types the element type has to be adjusted */
 828                 type_t *element_type      = type->array.element_type;
 829                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 830
 831                 if (qual_element_type == element_type)
 832                         return orig_type;
 833
 834                 copy                     = duplicate_type(type);
 835                 copy->array.element_type = qual_element_type;
 836         } else if (is_type_valid(type)) {
 837                 if ((type->base.qualifiers & qual) == qual)
 838                         return orig_type;
 839
 840                 copy                   = duplicate_type(type);
 841                 copy->base.qualifiers |= qual;
 842         } else {
 843                 return type;
 844         }
 845
 846         return identify_new_type(copy);
 847 }
 848
 849 /**
 850  * Check if a type is valid.
 851  *
 852  * @param type  The type to check.
 853  * @return true if type represents a valid type.
 854  */
 855 bool type_valid(const type_t *type)
 856 {
 857         return type->kind != TYPE_INVALID;
 858 }
 859
 860 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 861                                   atomic_type_flag_t flag)
 862 {
 863         assert(kind <= ATOMIC_TYPE_LAST);
 864         return (atomic_type_properties[kind].flags & flag) != 0;
 865 }
 866
 867 /**
 868  * Returns true if the given type is an integer type.
 869  *
 870  * @param type  The type to check.
 871  * @return True if type is an integer type.
 872  */
 873 bool is_type_integer(const type_t *type)
 874 {
 875         assert(!is_typeref(type));
 876
 877         if (type->kind == TYPE_ENUM)
 878                 return true;
 879         if (type->kind == TYPE_BITFIELD)
 880                 return true;
 881
 882         if (type->kind != TYPE_ATOMIC)
 883                 return false;
 884
 885         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 886 }
 887
 888 /**
 889  * Returns true if the given type is an enum type.
 890  *
 891  * @param type  The type to check.
 892  * @return True if type is an enum type.
 893  */
 894 bool is_type_enum(const type_t *type)
 895 {
 896         assert(!is_typeref(type));
 897         return type->kind == TYPE_ENUM;
 898 }
 899
 900 /**
 901  * Returns true if the given type is an floating point type.
 902  *
 903  * @param type  The type to check.
 904  * @return True if type is a floating point type.
 905  */
 906 bool is_type_float(const type_t *type)
 907 {
 908         assert(!is_typeref(type));
 909
 910         if (type->kind != TYPE_ATOMIC)
 911                 return false;
 912
 913         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 914 }
 915
 916 /**
 917  * Returns true if the given type is an complex type.
 918  *
 919  * @param type  The type to check.
 920  * @return True if type is a complex type.
 921  */
 922 bool is_type_complex(const type_t *type)
 923 {
 924         assert(!is_typeref(type));
 925
 926         if (type->kind != TYPE_ATOMIC)
 927                 return false;
 928
 929         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 930 }
 931
 932 /**
 933  * Returns true if the given type is a signed type.
 934  *
 935  * @param type  The type to check.
 936  * @return True if type is a signed type.
 937  */
 938 bool is_type_signed(const type_t *type)
 939 {
 940         assert(!is_typeref(type));
 941
 942         /* enum types are int for now */
 943         if (type->kind == TYPE_ENUM)
 944                 return true;
 945         if (type->kind == TYPE_BITFIELD)
 946                 return is_type_signed(type->bitfield.base_type);
 947
 948         if (type->kind != TYPE_ATOMIC)
 949                 return false;
 950
 951         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 952 }
 953
 954 /**
 955  * Returns true if the given type represents an arithmetic type.
 956  *
 957  * @param type  The type to check.
 958  * @return True if type represents an arithmetic type.
 959  */
 960 bool is_type_arithmetic(const type_t *type)
 961 {
 962         assert(!is_typeref(type));
 963
 964         switch(type->kind) {
 965         case TYPE_BITFIELD:
 966         case TYPE_ENUM:
 967                 return true;
 968         case TYPE_ATOMIC:
 969                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 970         case TYPE_COMPLEX:
 971                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 972         case TYPE_IMAGINARY:
 973                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 974         default:
 975                 return false;
 976         }
 977 }
 978
 979 /**
 980  * Returns true if the given type is an integer or float type.
 981  *
 982  * @param type  The type to check.
 983  * @return True if type is an integer or float type.
 984  */
 985 bool is_type_real(const type_t *type)
 986 {
 987         /* 6.2.5 (17) */
 988         return is_type_integer(type) || is_type_float(type);
 989 }
 990
 991 /**
 992  * Returns true if the given type represents a scalar type.
 993  *
 994  * @param type  The type to check.
 995  * @return True if type represents a scalar type.
 996  */
 997 bool is_type_scalar(const type_t *type)
 998 {
 999         assert(!is_typeref(type));
1000
1001         switch (type->kind) {
1002                 case TYPE_POINTER: return true;
1003                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1004                 default:           break;
1005         }
1006
1007         return is_type_arithmetic(type);
1008 }
1009
1010 /**
1011  * Check if a given type is incomplete.
1012  *
1013  * @param type  The type to check.
1014  * @return True if the given type is incomplete (ie. just forward).
1015  */
1016 bool is_type_incomplete(const type_t *type)
1017 {
1018         assert(!is_typeref(type));
1019
1020         switch(type->kind) {
1021         case TYPE_COMPOUND_STRUCT:
1022         case TYPE_COMPOUND_UNION: {
1023                 const compound_type_t *compound_type = &type->compound;
1024                 return !compound_type->compound->complete;
1025         }
1026         case TYPE_ENUM:
1027                 return false;
1028
1029         case TYPE_ARRAY:
1030                 return type->array.size_expression == NULL
1031                         && !type->array.size_constant;
1032
1033         case TYPE_ATOMIC:
1034                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1035
1036         case TYPE_COMPLEX:
1037                 return type->complex.akind == ATOMIC_TYPE_VOID;
1038
1039         case TYPE_IMAGINARY:
1040                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1041
1042         case TYPE_BITFIELD:
1043         case TYPE_FUNCTION:
1044         case TYPE_POINTER:
1045         case TYPE_REFERENCE:
1046         case TYPE_BUILTIN:
1047         case TYPE_ERROR:
1048                 return false;
1049
1050         case TYPE_TYPEDEF:
1051         case TYPE_TYPEOF:
1052                 panic("is_type_incomplete called without typerefs skipped");
1053         case TYPE_INVALID:
1054                 break;
1055         }
1056
1057         panic("invalid type found");
1058 }
1059
1060 bool is_type_object(const type_t *type)
1061 {
1062         return !is_type_function(type) && !is_type_incomplete(type);
1063 }
1064
1065 bool is_builtin_va_list(type_t *type)
1066 {
1067         type_t *tp = skip_typeref(type);
1068
1069         return tp->kind == type_valist->kind &&
1070                tp->builtin.symbol == type_valist->builtin.symbol;
1071 }
1072
1073 /**
1074  * Check if two function types are compatible.
1075  */
1076 static bool function_types_compatible(const function_type_t *func1,
1077                                       const function_type_t *func2)
1078 {
1079         const type_t* const ret1 = skip_typeref(func1->return_type);
1080         const type_t* const ret2 = skip_typeref(func2->return_type);
1081         if (!types_compatible(ret1, ret2))
1082                 return false;
1083
1084         if (func1->linkage != func2->linkage)
1085                 return false;
1086
1087         cc_kind_t cc1 = func1->calling_convention;
1088         if (cc1 == CC_DEFAULT)
1089                 cc1 = default_calling_convention;
1090         cc_kind_t cc2 = func2->calling_convention;
1091         if (cc2 == CC_DEFAULT)
1092                 cc2 = default_calling_convention;
1093
1094         if (cc1 != cc2)
1095                 return false;
1096
1097         if (func1->variadic != func2->variadic)
1098                 return false;
1099
1100         /* can parameters be compared? */
1101         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1102                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1103                 return true;
1104
1105         /* TODO: handling of unspecified parameters not correct yet */
1106
1107         /* all argument types must be compatible */
1108         function_parameter_t *parameter1 = func1->parameters;
1109         function_parameter_t *parameter2 = func2->parameters;
1110         for ( ; parameter1 != NULL && parameter2 != NULL;
1111                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1112                 type_t *parameter1_type = skip_typeref(parameter1->type);
1113                 type_t *parameter2_type = skip_typeref(parameter2->type);
1114
1115                 parameter1_type = get_unqualified_type(parameter1_type);
1116                 parameter2_type = get_unqualified_type(parameter2_type);
1117
1118                 if (!types_compatible(parameter1_type, parameter2_type))
1119                         return false;
1120         }
1121         /* same number of arguments? */
1122         if (parameter1 != NULL || parameter2 != NULL)
1123                 return false;
1124
1125         return true;
1126 }
1127
1128 /**
1129  * Check if two array types are compatible.
1130  */
1131 static bool array_types_compatible(const array_type_t *array1,
1132                                    const array_type_t *array2)
1133 {
1134         type_t *element_type1 = skip_typeref(array1->element_type);
1135         type_t *element_type2 = skip_typeref(array2->element_type);
1136         if (!types_compatible(element_type1, element_type2))
1137                 return false;
1138
1139         if (!array1->size_constant || !array2->size_constant)
1140                 return true;
1141
1142         return array1->size == array2->size;
1143 }
1144
1145 /**
1146  * Check if two types are compatible.
1147  */
1148 bool types_compatible(const type_t *type1, const type_t *type2)
1149 {
1150         assert(!is_typeref(type1));
1151         assert(!is_typeref(type2));
1152
1153         /* shortcut: the same type is always compatible */
1154         if (type1 == type2)
1155                 return true;
1156
1157         if (!is_type_valid(type1) || !is_type_valid(type2))
1158                 return true;
1159
1160         if (type1->base.qualifiers != type2->base.qualifiers)
1161                 return false;
1162         if (type1->kind != type2->kind)
1163                 return false;
1164
1165         switch (type1->kind) {
1166         case TYPE_FUNCTION:
1167                 return function_types_compatible(&type1->function, &type2->function);
1168         case TYPE_ATOMIC:
1169                 return type1->atomic.akind == type2->atomic.akind;
1170         case TYPE_COMPLEX:
1171                 return type1->complex.akind == type2->complex.akind;
1172         case TYPE_IMAGINARY:
1173                 return type1->imaginary.akind == type2->imaginary.akind;
1174         case TYPE_ARRAY:
1175                 return array_types_compatible(&type1->array, &type2->array);
1176
1177         case TYPE_POINTER: {
1178                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1179                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1180                 return types_compatible(to1, to2);
1181         }
1182
1183         case TYPE_REFERENCE: {
1184                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1185                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1186                 return types_compatible(to1, to2);
1187         }
1188
1189         case TYPE_COMPOUND_STRUCT:
1190         case TYPE_COMPOUND_UNION: {
1191
1192
1193                 break;
1194         }
1195         case TYPE_ENUM:
1196         case TYPE_BUILTIN:
1197                 /* TODO: not implemented */
1198                 break;
1199
1200         case TYPE_BITFIELD:
1201                 /* not sure if this makes sense or is even needed, implement it if you
1202                  * really need it! */
1203                 panic("type compatibility check for bitfield type");
1204
1205         case TYPE_ERROR:
1206                 /* Hmm, the error type should be compatible to all other types */
1207                 return true;
1208         case TYPE_INVALID:
1209                 panic("invalid type found in compatible types");
1210         case TYPE_TYPEDEF:
1211         case TYPE_TYPEOF:
1212                 panic("typerefs not skipped in compatible types?!?");
1213         }
1214
1215         /* TODO: incomplete */
1216         return false;
1217 }
1218
1219 /**
1220  * Skip all typerefs and return the underlying type.
1221  */
1222 type_t *skip_typeref(type_t *type)
1223 {
1224         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1225
1226         while (true) {
1227                 switch (type->kind) {
1228                 case TYPE_ERROR:
1229                         return type;
1230                 case TYPE_TYPEDEF: {
1231                         qualifiers |= type->base.qualifiers;
1232
1233                         const typedef_type_t *typedef_type = &type->typedeft;
1234                         if (typedef_type->resolved_type != NULL) {
1235                                 type = typedef_type->resolved_type;
1236                                 break;
1237                         }
1238                         type = typedef_type->typedefe->type;
1239                         continue;
1240                 }
1241                 case TYPE_TYPEOF:
1242                         qualifiers |= type->base.qualifiers;
1243                         type        = type->typeoft.typeof_type;
1244                         continue;
1245                 default:
1246                         break;
1247                 }
1248                 break;
1249         }
1250
1251         if (qualifiers != TYPE_QUALIFIER_NONE) {
1252                 type_t *const copy = duplicate_type(type);
1253
1254                 /* for const with typedefed array type the element type has to be
1255                  * adjusted */
1256                 if (is_type_array(copy)) {
1257                         type_t *element_type           = copy->array.element_type;
1258                         element_type                   = duplicate_type(element_type);
1259                         element_type->base.qualifiers |= qualifiers;
1260                         copy->array.element_type       = element_type;
1261                 } else {
1262                         copy->base.qualifiers |= qualifiers;
1263                 }
1264
1265                 type = identify_new_type(copy);
1266         }
1267
1268         return type;
1269 }
1270
1271 unsigned get_type_size(type_t *type)
1272 {
1273         switch (type->kind) {
1274         case TYPE_INVALID:
1275                 break;
1276         case TYPE_ERROR:
1277                 return 0;
1278         case TYPE_ATOMIC:
1279                 return get_atomic_type_size(type->atomic.akind);
1280         case TYPE_COMPLEX:
1281                 return get_atomic_type_size(type->complex.akind) * 2;
1282         case TYPE_IMAGINARY:
1283                 return get_atomic_type_size(type->imaginary.akind);
1284         case TYPE_COMPOUND_UNION:
1285                 layout_union_type(&type->compound);
1286                 return type->compound.compound->size;
1287         case TYPE_COMPOUND_STRUCT:
1288                 layout_struct_type(&type->compound);
1289                 return type->compound.compound->size;
1290         case TYPE_ENUM:
1291                 return get_atomic_type_size(type->enumt.akind);
1292         case TYPE_FUNCTION:
1293                 return 0; /* non-const (but "address-const") */
1294         case TYPE_REFERENCE:
1295         case TYPE_POINTER:
1296                 /* TODO: make configurable by backend */
1297                 return 4;
1298         case TYPE_ARRAY: {
1299                 /* TODO: correct if element_type is aligned? */
1300                 il_size_t element_size = get_type_size(type->array.element_type);
1301                 return type->array.size * element_size;
1302         }
1303         case TYPE_BITFIELD:
1304                 return 0;
1305         case TYPE_BUILTIN:
1306                 return get_type_size(type->builtin.real_type);
1307         case TYPE_TYPEDEF:
1308                 return get_type_size(type->typedeft.typedefe->type);
1309         case TYPE_TYPEOF:
1310                 if (type->typeoft.typeof_type) {
1311                         return get_type_size(type->typeoft.typeof_type);
1312                 } else {
1313                         return get_type_size(type->typeoft.expression->base.type);
1314                 }
1315         }
1316         panic("invalid type in get_type_size");
1317 }
1318
1319 unsigned get_type_alignment(type_t *type)
1320 {
1321         switch (type->kind) {
1322         case TYPE_INVALID:
1323                 break;
1324         case TYPE_ERROR:
1325                 return 0;
1326         case TYPE_ATOMIC:
1327                 return get_atomic_type_alignment(type->atomic.akind);
1328         case TYPE_COMPLEX:
1329                 return get_atomic_type_alignment(type->complex.akind);
1330         case TYPE_IMAGINARY:
1331                 return get_atomic_type_alignment(type->imaginary.akind);
1332         case TYPE_COMPOUND_UNION:
1333                 layout_union_type(&type->compound);
1334                 return type->compound.compound->alignment;
1335         case TYPE_COMPOUND_STRUCT:
1336                 layout_struct_type(&type->compound);
1337                 return type->compound.compound->alignment;
1338         case TYPE_ENUM:
1339                 return get_atomic_type_alignment(type->enumt.akind);
1340         case TYPE_FUNCTION:
1341                 /* what is correct here? */
1342                 return 4;
1343         case TYPE_REFERENCE:
1344         case TYPE_POINTER:
1345                 /* TODO: make configurable by backend */
1346                 return 4;
1347         case TYPE_ARRAY:
1348                 return get_type_alignment(type->array.element_type);
1349         case TYPE_BITFIELD:
1350                 return 0;
1351         case TYPE_BUILTIN:
1352                 return get_type_alignment(type->builtin.real_type);
1353         case TYPE_TYPEDEF: {
1354                 il_alignment_t alignment
1355                         = get_type_alignment(type->typedeft.typedefe->type);
1356                 if (type->typedeft.typedefe->alignment > alignment)
1357                         alignment = type->typedeft.typedefe->alignment;
1358
1359                 return alignment;
1360         }
1361         case TYPE_TYPEOF:
1362                 if (type->typeoft.typeof_type) {
1363                         return get_type_alignment(type->typeoft.typeof_type);
1364                 } else {
1365                         return get_type_alignment(type->typeoft.expression->base.type);
1366                 }
1367         }
1368         panic("invalid type in get_type_alignment");
1369 }
1370
1371 decl_modifiers_t get_type_modifiers(const type_t *type)
1372 {
1373         switch(type->kind) {
1374         case TYPE_INVALID:
1375         case TYPE_ERROR:
1376                 break;
1377         case TYPE_COMPOUND_STRUCT:
1378         case TYPE_COMPOUND_UNION:
1379                 return type->compound.compound->modifiers;
1380         case TYPE_FUNCTION:
1381                 return type->function.modifiers;
1382         case TYPE_ENUM:
1383         case TYPE_ATOMIC:
1384         case TYPE_COMPLEX:
1385         case TYPE_IMAGINARY:
1386         case TYPE_REFERENCE:
1387         case TYPE_POINTER:
1388         case TYPE_BITFIELD:
1389         case TYPE_ARRAY:
1390                 return 0;
1391         case TYPE_BUILTIN:
1392                 return get_type_modifiers(type->builtin.real_type);
1393         case TYPE_TYPEDEF: {
1394                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1395                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1396                 return modifiers;
1397         }
1398         case TYPE_TYPEOF:
1399                 if (type->typeoft.typeof_type) {
1400                         return get_type_modifiers(type->typeoft.typeof_type);
1401                 } else {
1402                         return get_type_modifiers(type->typeoft.expression->base.type);
1403                 }
1404         }
1405         panic("invalid type found in get_type_modifiers");
1406 }
1407
1408 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1409 {
1410         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1411
1412         while (true) {
1413                 switch (type->base.kind) {
1414                 case TYPE_ERROR:
1415                         return TYPE_QUALIFIER_NONE;
1416                 case TYPE_TYPEDEF:
1417                         qualifiers |= type->base.qualifiers;
1418                         const typedef_type_t *typedef_type = &type->typedeft;
1419                         if (typedef_type->resolved_type != NULL)
1420                                 type = typedef_type->resolved_type;
1421                         else
1422                                 type = typedef_type->typedefe->type;
1423                         continue;
1424                 case TYPE_TYPEOF:
1425                         type = type->typeoft.typeof_type;
1426                         continue;
1427                 case TYPE_ARRAY:
1428                         if (skip_array_type) {
1429                                 type = type->array.element_type;
1430                                 continue;
1431                         }
1432                         break;
1433                 default:
1434                         break;
1435                 }
1436                 break;
1437         }
1438         return type->base.qualifiers | qualifiers;
1439 }
1440
1441 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1442 {
1443         assert(kind <= ATOMIC_TYPE_LAST);
1444         return atomic_type_properties[kind].size;
1445 }
1446
1447 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1448 {
1449         assert(kind <= ATOMIC_TYPE_LAST);
1450         return atomic_type_properties[kind].alignment;
1451 }
1452
1453 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1454 {
1455         assert(kind <= ATOMIC_TYPE_LAST);
1456         return atomic_type_properties[kind].flags;
1457 }
1458
1459 atomic_type_kind_t get_intptr_kind(void)
1460 {
1461         if (machine_size <= 32)
1462                 return ATOMIC_TYPE_INT;
1463         else if (machine_size <= 64)
1464                 return ATOMIC_TYPE_LONG;
1465         else
1466                 return ATOMIC_TYPE_LONGLONG;
1467 }
1468
1469 atomic_type_kind_t get_uintptr_kind(void)
1470 {
1471         if (machine_size <= 32)
1472                 return ATOMIC_TYPE_UINT;
1473         else if (machine_size <= 64)
1474                 return ATOMIC_TYPE_ULONG;
1475         else
1476                 return ATOMIC_TYPE_ULONGLONG;
1477 }
1478
1479 /**
1480  * Find the atomic type kind representing a given size (signed).
1481  */
1482 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1483 {
1484         static atomic_type_kind_t kinds[32];
1485
1486         assert(size < 32);
1487         atomic_type_kind_t kind = kinds[size];
1488         if (kind == ATOMIC_TYPE_INVALID) {
1489                 static const atomic_type_kind_t possible_kinds[] = {
1490                         ATOMIC_TYPE_SCHAR,
1491                         ATOMIC_TYPE_SHORT,
1492                         ATOMIC_TYPE_INT,
1493                         ATOMIC_TYPE_LONG,
1494                         ATOMIC_TYPE_LONGLONG
1495                 };
1496                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1497                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1498                                 kind = possible_kinds[i];
1499                                 break;
1500                         }
1501                 }
1502                 kinds[size] = kind;
1503         }
1504         return kind;
1505 }
1506
1507 /**
1508  * Find the atomic type kind representing a given size (signed).
1509  */
1510 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1511 {
1512         static atomic_type_kind_t kinds[32];
1513
1514         assert(size < 32);
1515         atomic_type_kind_t kind = kinds[size];
1516         if (kind == ATOMIC_TYPE_INVALID) {
1517                 static const atomic_type_kind_t possible_kinds[] = {
1518                         ATOMIC_TYPE_UCHAR,
1519                         ATOMIC_TYPE_USHORT,
1520                         ATOMIC_TYPE_UINT,
1521                         ATOMIC_TYPE_ULONG,
1522                         ATOMIC_TYPE_ULONGLONG
1523                 };
1524                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1525                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1526                                 kind = possible_kinds[i];
1527                                 break;
1528                         }
1529                 }
1530                 kinds[size] = kind;
1531         }
1532         return kind;
1533 }
1534
1535 /**
1536  * Hash the given type and return the "singleton" version
1537  * of it.
1538  */
1539 type_t *identify_new_type(type_t *type)
1540 {
1541         type_t *result = typehash_insert(type);
1542         if (result != type) {
1543                 obstack_free(type_obst, type);
1544         }
1545         return result;
1546 }
1547
1548 /**
1549  * Creates a new atomic type.
1550  *
1551  * @param akind       The kind of the atomic type.
1552  * @param qualifiers  Type qualifiers for the new type.
1553  */
1554 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1555 {
1556         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1557         memset(type, 0, sizeof(atomic_type_t));
1558
1559         type->kind            = TYPE_ATOMIC;
1560         type->base.qualifiers = qualifiers;
1561         type->atomic.akind    = akind;
1562
1563         return identify_new_type(type);
1564 }
1565
1566 /**
1567  * Creates a new complex type.
1568  *
1569  * @param akind       The kind of the atomic type.
1570  * @param qualifiers  Type qualifiers for the new type.
1571  */
1572 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1573 {
1574         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1575         memset(type, 0, sizeof(complex_type_t));
1576
1577         type->kind            = TYPE_COMPLEX;
1578         type->base.qualifiers = qualifiers;
1579         type->complex.akind   = akind;
1580
1581         return identify_new_type(type);
1582 }
1583
1584 /**
1585  * Creates a new imaginary type.
1586  *
1587  * @param akind       The kind of the atomic type.
1588  * @param qualifiers  Type qualifiers for the new type.
1589  */
1590 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1591 {
1592         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1593         memset(type, 0, sizeof(imaginary_type_t));
1594
1595         type->kind            = TYPE_IMAGINARY;
1596         type->base.qualifiers = qualifiers;
1597         type->imaginary.akind = akind;
1598
1599         return identify_new_type(type);
1600 }
1601
1602 /**
1603  * Creates a new pointer type.
1604  *
1605  * @param points_to   The points-to type for the new type.
1606  * @param qualifiers  Type qualifiers for the new type.
1607  */
1608 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1609 {
1610         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1611         memset(type, 0, sizeof(pointer_type_t));
1612
1613         type->kind                  = TYPE_POINTER;
1614         type->base.qualifiers       = qualifiers;
1615         type->pointer.points_to     = points_to;
1616         type->pointer.base_variable = NULL;
1617
1618         return identify_new_type(type);
1619 }
1620
1621 /**
1622  * Creates a new reference type.
1623  *
1624  * @param refers_to   The referred-to type for the new type.
1625  */
1626 type_t *make_reference_type(type_t *refers_to)
1627 {
1628         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1629         memset(type, 0, sizeof(reference_type_t));
1630
1631         type->kind                = TYPE_REFERENCE;
1632         type->base.qualifiers     = 0;
1633         type->reference.refers_to = refers_to;
1634
1635         return identify_new_type(type);
1636 }
1637
1638 /**
1639  * Creates a new based pointer type.
1640  *
1641  * @param points_to   The points-to type for the new type.
1642  * @param qualifiers  Type qualifiers for the new type.
1643  * @param variable    The based variable
1644  */
1645 type_t *make_based_pointer_type(type_t *points_to,
1646                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1647 {
1648         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1649         memset(type, 0, sizeof(pointer_type_t));
1650
1651         type->kind                  = TYPE_POINTER;
1652         type->base.qualifiers       = qualifiers;
1653         type->pointer.points_to     = points_to;
1654         type->pointer.base_variable = variable;
1655
1656         return identify_new_type(type);
1657 }
1658
1659
1660 type_t *make_array_type(type_t *element_type, size_t size,
1661                         type_qualifiers_t qualifiers)
1662 {
1663         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1664         memset(type, 0, sizeof(array_type_t));
1665
1666         type->kind                = TYPE_ARRAY;
1667         type->base.qualifiers     = qualifiers;
1668         type->array.element_type  = element_type;
1669         type->array.size          = size;
1670         type->array.size_constant = true;
1671
1672         return identify_new_type(type);
1673 }
1674
1675 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1676                                        il_alignment_t *struct_alignment,
1677                                                                            bool packed, entity_t *first)
1678 {
1679         il_size_t      offset     = *struct_offset;
1680         il_alignment_t alignment  = *struct_alignment;
1681         size_t         bit_offset = 0;
1682
1683         entity_t *member;
1684         for (member = first; member != NULL; member = member->base.next) {
1685                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1686                         break;
1687
1688                 type_t *type = member->declaration.type;
1689                 if (type->kind != TYPE_BITFIELD)
1690                         break;
1691
1692                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1693                 il_alignment_t base_alignment = get_type_alignment(base_type);
1694                 il_alignment_t alignment_mask = base_alignment-1;
1695                 if (base_alignment > alignment)
1696                         alignment = base_alignment;
1697
1698                 size_t bit_size = type->bitfield.bit_size;
1699                 if (!packed) {
1700                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1701                         offset     &= ~alignment_mask;
1702                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1703
1704                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1705                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1706                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1707                                 bit_offset = 0;
1708                         }
1709                 }
1710
1711                 member->compound_member.offset     = offset;
1712                 member->compound_member.bit_offset = bit_offset;
1713
1714                 bit_offset += bit_size;
1715                 offset     += bit_offset / BITS_PER_BYTE;
1716                 bit_offset %= BITS_PER_BYTE;
1717         }
1718
1719         if (bit_offset > 0)
1720                 offset += 1;
1721
1722         *struct_offset    = offset;
1723         *struct_alignment = alignment;
1724
1725         return member;
1726 }
1727
1728 /**
1729  * Finish the construction of a struct type by calculating its size, offsets,
1730  * alignment.
1731  */
1732 void layout_struct_type(compound_type_t *type)
1733 {
1734         assert(type->compound != NULL);
1735
1736         compound_t *compound = type->compound;
1737         if (!compound->complete)
1738                 return;
1739         if (type->compound->layouted)
1740                 return;
1741
1742         il_size_t      offset    = 0;
1743         il_alignment_t alignment = compound->alignment;
1744         bool           need_pad  = false;
1745
1746         entity_t *entry = compound->members.entities;
1747         while (entry != NULL) {
1748                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1749                         entry = entry->base.next;
1750                         continue;
1751                 }
1752
1753                 type_t *m_type  = entry->declaration.type;
1754                 type_t *skipped = skip_typeref(m_type);
1755                 if (! is_type_valid(skipped)) {
1756                         entry = entry->base.next;
1757                         continue;
1758                 }
1759
1760                 if (skipped->kind == TYPE_BITFIELD) {
1761                         entry = pack_bitfield_members(&offset, &alignment,
1762                                                       compound->packed, entry);
1763                         continue;
1764                 }
1765
1766                 il_alignment_t m_alignment = get_type_alignment(m_type);
1767                 if (m_alignment > alignment)
1768                         alignment = m_alignment;
1769
1770                 if (!compound->packed) {
1771                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1772
1773                         if (new_offset > offset) {
1774                                 need_pad = true;
1775                                 offset   = new_offset;
1776                         }
1777                 }
1778
1779                 entry->compound_member.offset = offset;
1780                 offset += get_type_size(m_type);
1781
1782                 entry = entry->base.next;
1783         }
1784
1785         if (!compound->packed) {
1786                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1787                 if (new_offset > offset) {
1788                         need_pad = true;
1789                         offset   = new_offset;
1790                 }
1791         }
1792
1793         if (need_pad) {
1794                 if (warning.padded) {
1795                         warningf(&compound->base.source_position, "'%T' needs padding",
1796                                  type);
1797                 }
1798         } else if (compound->packed && warning.packed) {
1799                 warningf(&compound->base.source_position,
1800                          "superfluous packed attribute on '%T'", type);
1801         }
1802
1803         compound->size      = offset;
1804         compound->alignment = alignment;
1805         compound->layouted  = true;
1806 }
1807
1808 /**
1809  * Finish the construction of an union type by calculating
1810  * its size and alignment.
1811  */
1812 void layout_union_type(compound_type_t *type)
1813 {
1814         assert(type->compound != NULL);
1815
1816         compound_t *compound = type->compound;
1817         if (! compound->complete)
1818                 return;
1819
1820         il_size_t      size      = 0;
1821         il_alignment_t alignment = compound->alignment;
1822
1823         entity_t *entry = compound->members.entities;
1824         for (; entry != NULL; entry = entry->base.next) {
1825                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1826                         continue;
1827
1828                 type_t *m_type = entry->declaration.type;
1829                 if (! is_type_valid(skip_typeref(m_type)))
1830                         continue;
1831
1832                 entry->compound_member.offset = 0;
1833                 il_size_t m_size = get_type_size(m_type);
1834                 if (m_size > size)
1835                         size = m_size;
1836                 il_alignment_t m_alignment = get_type_alignment(m_type);
1837                 if (m_alignment > alignment)
1838                         alignment = m_alignment;
1839         }
1840         size = (size + alignment - 1) & -alignment;
1841
1842         compound->size      = size;
1843         compound->alignment = alignment;
1844 }
1845
1846 /**
1847  * Debug helper. Prints the given type to stdout.
1848  */
1849 static __attribute__((unused))
1850 void dbg_type(const type_t *type)
1851 {
1852         print_to_file(stderr);
1853         print_type(type);
1854         print_string("\n");
1855         fflush(stderr);
1856 }