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  * Returns the size of a type node.
  57  *
  58  * @param kind  the type kind
  59  */
  60 static size_t get_type_struct_size(type_kind_t kind)
  61 {
  62         static const size_t sizes[] = {
  63                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  64                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  65                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  66                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
  67                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  68                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  69                 [TYPE_ENUM]            = sizeof(enum_type_t),
  70                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  71                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  72                 [TYPE_ARRAY]           = sizeof(array_type_t),
  73                 [TYPE_BUILTIN]         = sizeof(builtin_type_t),
  74                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  75                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  76         };
  77         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  78         assert(kind <= TYPE_TYPEOF);
  79         assert(sizes[kind] != 0);
  80         return sizes[kind];
  81 }
  82
  83 type_t *allocate_type_zero(type_kind_t kind)
  84 {
  85         size_t  size = get_type_struct_size(kind);
  86         type_t *res  = obstack_alloc(type_obst, size);
  87         memset(res, 0, size);
  88         res->base.kind = kind;
  89
  90         return res;
  91 }
  92
  93 /**
  94  * Properties of atomic types.
  95  */
  96 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  97         //ATOMIC_TYPE_INVALID = 0,
  98         [ATOMIC_TYPE_VOID] = {
  99                 .size       = 0,
 100                 .alignment  = 0,
 101                 .flags      = ATOMIC_TYPE_FLAG_NONE
 102         },
 103         [ATOMIC_TYPE_WCHAR_T] = {
 104                 .size       = (unsigned)-1,
 105                 .alignment  = (unsigned)-1,
 106                 /* signed flag will be set when known */
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 108         },
 109         [ATOMIC_TYPE_CHAR] = {
 110                 .size       = 1,
 111                 .alignment  = 1,
 112                 /* signed flag will be set when known */
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_SCHAR] = {
 116                 .size       = 1,
 117                 .alignment  = 1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 119                               | ATOMIC_TYPE_FLAG_SIGNED,
 120         },
 121         [ATOMIC_TYPE_UCHAR] = {
 122                 .size       = 1,
 123                 .alignment  = 1,
 124                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 125         },
 126         [ATOMIC_TYPE_SHORT] = {
 127                 .size       = 2,
 128                 .alignment  = 2,
 129                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 130                               | ATOMIC_TYPE_FLAG_SIGNED
 131         },
 132         [ATOMIC_TYPE_USHORT] = {
 133                 .size       = 2,
 134                 .alignment  = 2,
 135                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 136         },
 137         [ATOMIC_TYPE_INT] = {
 138                 .size       = (unsigned) -1,
 139                 .alignment  = (unsigned) -1,
 140                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 141                               | ATOMIC_TYPE_FLAG_SIGNED,
 142         },
 143         [ATOMIC_TYPE_UINT] = {
 144                 .size       = (unsigned) -1,
 145                 .alignment  = (unsigned) -1,
 146                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 147         },
 148         [ATOMIC_TYPE_LONG] = {
 149                 .size       = (unsigned) -1,
 150                 .alignment  = (unsigned) -1,
 151                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 152                               | ATOMIC_TYPE_FLAG_SIGNED,
 153         },
 154         [ATOMIC_TYPE_ULONG] = {
 155                 .size       = (unsigned) -1,
 156                 .alignment  = (unsigned) -1,
 157                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 158         },
 159         [ATOMIC_TYPE_LONGLONG] = {
 160                 .size       = (unsigned) -1,
 161                 .alignment  = (unsigned) -1,
 162                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 163                               | ATOMIC_TYPE_FLAG_SIGNED,
 164         },
 165         [ATOMIC_TYPE_ULONGLONG] = {
 166                 .size       = (unsigned) -1,
 167                 .alignment  = (unsigned) -1,
 168                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 169         },
 170         [ATOMIC_TYPE_BOOL] = {
 171                 .size       = (unsigned) -1,
 172                 .alignment  = (unsigned) -1,
 173                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 174         },
 175         [ATOMIC_TYPE_FLOAT] = {
 176                 .size       = 4,
 177                 .alignment  = (unsigned) -1,
 178                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 179                               | ATOMIC_TYPE_FLAG_SIGNED,
 180         },
 181         [ATOMIC_TYPE_DOUBLE] = {
 182                 .size       = 8,
 183                 .alignment  = (unsigned) -1,
 184                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 185                               | ATOMIC_TYPE_FLAG_SIGNED,
 186         },
 187         [ATOMIC_TYPE_LONG_DOUBLE] = {
 188                 .size       = 12,
 189                 .alignment  = (unsigned) -1,
 190                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 191                               | ATOMIC_TYPE_FLAG_SIGNED,
 192         },
 193         /* complex and imaginary types are set in init_types */
 194 };
 195
 196 void init_types(void)
 197 {
 198         obstack_init(type_obst);
 199
 200         atomic_type_properties_t *props = atomic_type_properties;
 201
 202         if (char_is_signed) {
 203                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 204         }
 205
 206         unsigned int_size   = machine_size < 32 ? 2 : 4;
 207         /* long is always 32bit on windows */
 208         unsigned long_size  = c_mode & _MS ? 4 : (machine_size < 64 ? 4 : 8);
 209         unsigned llong_size = machine_size < 32 ? 4 : 8;
 210
 211         props[ATOMIC_TYPE_INT].size            = int_size;
 212         props[ATOMIC_TYPE_INT].alignment       = int_size;
 213         props[ATOMIC_TYPE_UINT].size           = int_size;
 214         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 215         props[ATOMIC_TYPE_LONG].size           = long_size;
 216         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 217         props[ATOMIC_TYPE_ULONG].size          = long_size;
 218         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 219         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 220         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 221         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 222         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 223
 224         /* TODO: backend specific, need a way to query the backend for this.
 225          * The following are good settings for x86 */
 226         if (machine_size <= 32) {
 227                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 228                 props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 229                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 230                 props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 231                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 232         } else {
 233                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 234                 props[ATOMIC_TYPE_DOUBLE].alignment      = 8;
 235                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 8;
 236                 props[ATOMIC_TYPE_LONGLONG].alignment    = 8;
 237                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 8;
 238         }
 239         if (force_long_double_size > 0) {
 240                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = force_long_double_size;
 241                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = force_long_double_size;
 242         }
 243
 244         /* TODO: make this configurable for platforms which do not use byte sized
 245          * bools. */
 246         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 247
 248         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 249 }
 250
 251 void exit_types(void)
 252 {
 253         obstack_free(type_obst, NULL);
 254 }
 255
 256 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 257 {
 258         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 259         if (qualifiers & TYPE_QUALIFIER_CONST) {
 260                 print_string(" const" + sep);
 261                 sep = 0;
 262         }
 263         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 264                 print_string(" volatile" + sep);
 265                 sep = 0;
 266         }
 267         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 268                 print_string(" restrict" + sep);
 269                 sep = 0;
 270         }
 271         if (sep == 0 && q & QUAL_SEP_END)
 272                 print_char(' ');
 273 }
 274
 275 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 276 {
 277         switch(kind) {
 278         case ATOMIC_TYPE_INVALID: break;
 279         case ATOMIC_TYPE_VOID:        return "void";
 280         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 281         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 282         case ATOMIC_TYPE_CHAR:        return "char";
 283         case ATOMIC_TYPE_SCHAR:       return "signed char";
 284         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 285         case ATOMIC_TYPE_INT:         return "int";
 286         case ATOMIC_TYPE_UINT:        return "unsigned int";
 287         case ATOMIC_TYPE_SHORT:       return "short";
 288         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 289         case ATOMIC_TYPE_LONG:        return "long";
 290         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 291         case ATOMIC_TYPE_LONGLONG:    return "long long";
 292         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 293         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 294         case ATOMIC_TYPE_FLOAT:       return "float";
 295         case ATOMIC_TYPE_DOUBLE:      return "double";
 296         }
 297         return "INVALIDATOMIC";
 298 }
 299
 300 /**
 301  * Prints the name of an atomic type kinds.
 302  *
 303  * @param kind  The type kind.
 304  */
 305 static void print_atomic_kinds(atomic_type_kind_t kind)
 306 {
 307         const char *s = get_atomic_kind_name(kind);
 308         print_string(s);
 309 }
 310
 311 /**
 312  * Prints the name of an atomic type.
 313  *
 314  * @param type  The type.
 315  */
 316 static void print_atomic_type(const atomic_type_t *type)
 317 {
 318         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 319         print_atomic_kinds(type->akind);
 320 }
 321
 322 /**
 323  * Prints the name of a complex type.
 324  *
 325  * @param type  The type.
 326  */
 327 static void print_complex_type(const complex_type_t *type)
 328 {
 329         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 330         print_string("_Complex");
 331         print_atomic_kinds(type->akind);
 332 }
 333
 334 /**
 335  * Prints the name of an imaginary type.
 336  *
 337  * @param type  The type.
 338  */
 339 static void print_imaginary_type(const imaginary_type_t *type)
 340 {
 341         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 342         print_string("_Imaginary ");
 343         print_atomic_kinds(type->akind);
 344 }
 345
 346 /**
 347  * Print the first part (the prefix) of a type.
 348  *
 349  * @param type   The type to print.
 350  */
 351 static void print_function_type_pre(const function_type_t *type)
 352 {
 353         switch (type->linkage) {
 354                 case LINKAGE_INVALID:
 355                         break;
 356
 357                 case LINKAGE_C:
 358                         if (c_mode & _CXX)
 359                                 print_string("extern \"C\" ");
 360                         break;
 361
 362                 case LINKAGE_CXX:
 363                         if (!(c_mode & _CXX))
 364                                 print_string("extern \"C++\" ");
 365                         break;
 366         }
 367
 368         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 369
 370         intern_print_type_pre(type->return_type);
 371
 372         cc_kind_t cc = type->calling_convention;
 373 restart:
 374         switch (cc) {
 375         case CC_CDECL:    print_string(" __cdecl");    break;
 376         case CC_STDCALL:  print_string(" __stdcall");  break;
 377         case CC_FASTCALL: print_string(" __fastcall"); break;
 378         case CC_THISCALL: print_string(" __thiscall"); break;
 379         case CC_DEFAULT:
 380                 if (default_calling_convention != CC_CDECL) {
 381                         /* show the default calling convention if its not cdecl */
 382                         cc = default_calling_convention;
 383                         goto restart;
 384                 }
 385                 break;
 386         }
 387 }
 388
 389 /**
 390  * Print the second part (the postfix) of a type.
 391  *
 392  * @param type   The type to print.
 393  */
 394 static void print_function_type_post(const function_type_t *type,
 395                                      const scope_t *parameters)
 396 {
 397         print_string("(");
 398         bool first = true;
 399         if (parameters == NULL) {
 400                 function_parameter_t *parameter = type->parameters;
 401                 for( ; parameter != NULL; parameter = parameter->next) {
 402                         if (first) {
 403                                 first = false;
 404                         } else {
 405                                 print_string(", ");
 406                         }
 407                         print_type(parameter->type);
 408                 }
 409         } else {
 410                 entity_t *parameter = parameters->entities;
 411                 for (; parameter != NULL; parameter = parameter->base.next) {
 412                         if (parameter->kind != ENTITY_PARAMETER)
 413                                 continue;
 414
 415                         if (first) {
 416                                 first = false;
 417                         } else {
 418                                 print_string(", ");
 419                         }
 420                         const type_t *const type = parameter->declaration.type;
 421                         if (type == NULL) {
 422                                 print_string(parameter->base.symbol->string);
 423                         } else {
 424                                 print_type_ext(type, parameter->base.symbol, NULL);
 425                         }
 426                 }
 427         }
 428         if (type->variadic) {
 429                 if (first) {
 430                         first = false;
 431                 } else {
 432                         print_string(", ");
 433                 }
 434                 print_string("...");
 435         }
 436         if (first && !type->unspecified_parameters) {
 437                 print_string("void");
 438         }
 439         print_string(")");
 440
 441         intern_print_type_post(type->return_type);
 442 }
 443
 444 /**
 445  * Prints the prefix part of a pointer type.
 446  *
 447  * @param type   The pointer type.
 448  */
 449 static void print_pointer_type_pre(const pointer_type_t *type)
 450 {
 451         type_t const *const points_to = type->points_to;
 452         intern_print_type_pre(points_to);
 453         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 454                 print_string(" (");
 455         variable_t *const variable = type->base_variable;
 456         if (variable != NULL) {
 457                 print_string(" __based(");
 458                 print_string(variable->base.base.symbol->string);
 459                 print_string(") ");
 460         }
 461         print_string("*");
 462         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 463 }
 464
 465 /**
 466  * Prints the postfix part of a pointer type.
 467  *
 468  * @param type   The pointer type.
 469  */
 470 static void print_pointer_type_post(const pointer_type_t *type)
 471 {
 472         type_t const *const points_to = type->points_to;
 473         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 474                 print_string(")");
 475         intern_print_type_post(points_to);
 476 }
 477
 478 /**
 479  * Prints the prefix part of a reference type.
 480  *
 481  * @param type   The reference type.
 482  */
 483 static void print_reference_type_pre(const reference_type_t *type)
 484 {
 485         type_t const *const refers_to = type->refers_to;
 486         intern_print_type_pre(refers_to);
 487         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 488                 print_string(" (");
 489         print_string("&");
 490 }
 491
 492 /**
 493  * Prints the postfix part of a reference type.
 494  *
 495  * @param type   The reference type.
 496  */
 497 static void print_reference_type_post(const reference_type_t *type)
 498 {
 499         type_t const *const refers_to = type->refers_to;
 500         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 501                 print_string(")");
 502         intern_print_type_post(refers_to);
 503 }
 504
 505 /**
 506  * Prints the prefix part of an array type.
 507  *
 508  * @param type   The array type.
 509  */
 510 static void print_array_type_pre(const array_type_t *type)
 511 {
 512         intern_print_type_pre(type->element_type);
 513 }
 514
 515 /**
 516  * Prints the postfix part of an array type.
 517  *
 518  * @param type   The array type.
 519  */
 520 static void print_array_type_post(const array_type_t *type)
 521 {
 522         print_string("[");
 523         if (type->is_static) {
 524                 print_string("static ");
 525         }
 526         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 527         if (type->size_expression != NULL
 528                         && (print_implicit_array_size || !type->has_implicit_size)) {
 529                 print_expression(type->size_expression);
 530         }
 531         print_string("]");
 532         intern_print_type_post(type->element_type);
 533 }
 534
 535 /**
 536  * Prints the postfix part of a bitfield type.
 537  *
 538  * @param type   The array type.
 539  */
 540 static void print_bitfield_type_post(const bitfield_type_t *type)
 541 {
 542         print_string(" : ");
 543         print_expression(type->size_expression);
 544         intern_print_type_post(type->base_type);
 545 }
 546
 547 /**
 548  * Prints an enum definition.
 549  *
 550  * @param declaration  The enum's type declaration.
 551  */
 552 void print_enum_definition(const enum_t *enume)
 553 {
 554         print_string("{\n");
 555
 556         change_indent(1);
 557
 558         entity_t *entry = enume->base.next;
 559         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 560                entry = entry->base.next) {
 561
 562                 print_indent();
 563                 print_string(entry->base.symbol->string);
 564                 if (entry->enum_value.value != NULL) {
 565                         print_string(" = ");
 566
 567                         /* skip the implicit cast */
 568                         expression_t *expression = entry->enum_value.value;
 569                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 570                                 expression = expression->unary.value;
 571                         }
 572                         print_expression(expression);
 573                 }
 574                 print_string(",\n");
 575         }
 576
 577         change_indent(-1);
 578         print_indent();
 579         print_string("}");
 580 }
 581
 582 /**
 583  * Prints an enum type.
 584  *
 585  * @param type  The enum type.
 586  */
 587 static void print_type_enum(const enum_type_t *type)
 588 {
 589         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 590         print_string("enum ");
 591
 592         enum_t   *enume  = type->enume;
 593         symbol_t *symbol = enume->base.symbol;
 594         if (symbol != NULL) {
 595                 print_string(symbol->string);
 596         } else {
 597                 print_enum_definition(enume);
 598         }
 599 }
 600
 601 /**
 602  * Print the compound part of a compound type.
 603  */
 604 void print_compound_definition(const compound_t *compound)
 605 {
 606         print_string("{\n");
 607         change_indent(1);
 608
 609         entity_t *entity = compound->members.entities;
 610         for( ; entity != NULL; entity = entity->base.next) {
 611                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 612                         continue;
 613
 614                 print_indent();
 615                 print_entity(entity);
 616                 print_string("\n");
 617         }
 618
 619         change_indent(-1);
 620         print_indent();
 621         print_string("}");
 622         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 623                 print_string("__attribute__((__transparent_union__))");
 624         }
 625 }
 626
 627 /**
 628  * Prints a compound type.
 629  *
 630  * @param type  The compound type.
 631  */
 632 static void print_compound_type(const compound_type_t *type)
 633 {
 634         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 635
 636         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 637                 print_string("struct ");
 638         } else {
 639                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 640                 print_string("union ");
 641         }
 642
 643         compound_t *compound = type->compound;
 644         symbol_t   *symbol   = compound->base.symbol;
 645         if (symbol != NULL) {
 646                 print_string(symbol->string);
 647         } else {
 648                 print_compound_definition(compound);
 649         }
 650 }
 651
 652 /**
 653  * Prints the prefix part of a typedef type.
 654  *
 655  * @param type   The typedef type.
 656  */
 657 static void print_typedef_type_pre(const typedef_type_t *const type)
 658 {
 659         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 660         print_string(type->typedefe->base.symbol->string);
 661 }
 662
 663 /**
 664  * Prints the prefix part of a typeof type.
 665  *
 666  * @param type   The typeof type.
 667  */
 668 static void print_typeof_type_pre(const typeof_type_t *const type)
 669 {
 670         print_string("typeof(");
 671         if (type->expression != NULL) {
 672                 print_expression(type->expression);
 673         } else {
 674                 print_type(type->typeof_type);
 675         }
 676         print_string(")");
 677 }
 678
 679 /**
 680  * Prints the prefix part of a type.
 681  *
 682  * @param type   The type.
 683  */
 684 static void intern_print_type_pre(const type_t *const type)
 685 {
 686         switch(type->kind) {
 687         case TYPE_ERROR:
 688                 print_string("<error>");
 689                 return;
 690         case TYPE_INVALID:
 691                 print_string("<invalid>");
 692                 return;
 693         case TYPE_ENUM:
 694                 print_type_enum(&type->enumt);
 695                 return;
 696         case TYPE_ATOMIC:
 697                 print_atomic_type(&type->atomic);
 698                 return;
 699         case TYPE_COMPLEX:
 700                 print_complex_type(&type->complex);
 701                 return;
 702         case TYPE_IMAGINARY:
 703                 print_imaginary_type(&type->imaginary);
 704                 return;
 705         case TYPE_COMPOUND_STRUCT:
 706         case TYPE_COMPOUND_UNION:
 707                 print_compound_type(&type->compound);
 708                 return;
 709         case TYPE_BUILTIN:
 710                 print_string(type->builtin.symbol->string);
 711                 return;
 712         case TYPE_FUNCTION:
 713                 print_function_type_pre(&type->function);
 714                 return;
 715         case TYPE_POINTER:
 716                 print_pointer_type_pre(&type->pointer);
 717                 return;
 718         case TYPE_REFERENCE:
 719                 print_reference_type_pre(&type->reference);
 720                 return;
 721         case TYPE_BITFIELD:
 722                 intern_print_type_pre(type->bitfield.base_type);
 723                 return;
 724         case TYPE_ARRAY:
 725                 print_array_type_pre(&type->array);
 726                 return;
 727         case TYPE_TYPEDEF:
 728                 print_typedef_type_pre(&type->typedeft);
 729                 return;
 730         case TYPE_TYPEOF:
 731                 print_typeof_type_pre(&type->typeoft);
 732                 return;
 733         }
 734         print_string("unknown");
 735 }
 736
 737 /**
 738  * Prints the postfix part of a type.
 739  *
 740  * @param type   The type.
 741  */
 742 static void intern_print_type_post(const type_t *const type)
 743 {
 744         switch(type->kind) {
 745         case TYPE_FUNCTION:
 746                 print_function_type_post(&type->function, NULL);
 747                 return;
 748         case TYPE_POINTER:
 749                 print_pointer_type_post(&type->pointer);
 750                 return;
 751         case TYPE_REFERENCE:
 752                 print_reference_type_post(&type->reference);
 753                 return;
 754         case TYPE_ARRAY:
 755                 print_array_type_post(&type->array);
 756                 return;
 757         case TYPE_BITFIELD:
 758                 print_bitfield_type_post(&type->bitfield);
 759                 return;
 760         case TYPE_ERROR:
 761         case TYPE_INVALID:
 762         case TYPE_ATOMIC:
 763         case TYPE_COMPLEX:
 764         case TYPE_IMAGINARY:
 765         case TYPE_ENUM:
 766         case TYPE_COMPOUND_STRUCT:
 767         case TYPE_COMPOUND_UNION:
 768         case TYPE_BUILTIN:
 769         case TYPE_TYPEOF:
 770         case TYPE_TYPEDEF:
 771                 break;
 772         }
 773 }
 774
 775 /**
 776  * Prints a type.
 777  *
 778  * @param type   The type.
 779  */
 780 void print_type(const type_t *const type)
 781 {
 782         print_type_ext(type, NULL, NULL);
 783 }
 784
 785 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 786                     const scope_t *parameters)
 787 {
 788         intern_print_type_pre(type);
 789         if (symbol != NULL) {
 790                 print_string(" ");
 791                 print_string(symbol->string);
 792         }
 793         if (type->kind == TYPE_FUNCTION) {
 794                 print_function_type_post(&type->function, parameters);
 795         } else {
 796                 intern_print_type_post(type);
 797         }
 798 }
 799
 800 /**
 801  * Duplicates a type.
 802  *
 803  * @param type  The type to copy.
 804  * @return A copy of the type.
 805  *
 806  * @note This does not produce a deep copy!
 807  */
 808 type_t *duplicate_type(const type_t *type)
 809 {
 810         size_t size = get_type_struct_size(type->kind);
 811
 812         type_t *copy = obstack_alloc(type_obst, size);
 813         memcpy(copy, type, size);
 814         copy->base.firm_type = NULL;
 815
 816         return copy;
 817 }
 818
 819 /**
 820  * Returns the unqualified type of a given type.
 821  *
 822  * @param type  The type.
 823  * @returns The unqualified type.
 824  */
 825 type_t *get_unqualified_type(type_t *type)
 826 {
 827         assert(!is_typeref(type));
 828
 829         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 830                 return type;
 831
 832         type_t *unqualified_type          = duplicate_type(type);
 833         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 834
 835         return identify_new_type(unqualified_type);
 836 }
 837
 838 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 839 {
 840         type_t *type = skip_typeref(orig_type);
 841
 842         type_t *copy;
 843         if (is_type_array(type)) {
 844                 /* For array types the element type has to be adjusted */
 845                 type_t *element_type      = type->array.element_type;
 846                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 847
 848                 if (qual_element_type == element_type)
 849                         return orig_type;
 850
 851                 copy                     = duplicate_type(type);
 852                 copy->array.element_type = qual_element_type;
 853         } else if (is_type_valid(type)) {
 854                 if ((type->base.qualifiers & qual) == qual)
 855                         return orig_type;
 856
 857                 copy                   = duplicate_type(type);
 858                 copy->base.qualifiers |= qual;
 859         } else {
 860                 return type;
 861         }
 862
 863         return identify_new_type(copy);
 864 }
 865
 866 /**
 867  * Check if a type is valid.
 868  *
 869  * @param type  The type to check.
 870  * @return true if type represents a valid type.
 871  */
 872 bool type_valid(const type_t *type)
 873 {
 874         return type->kind != TYPE_INVALID;
 875 }
 876
 877 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 878                                   atomic_type_flag_t flag)
 879 {
 880         assert(kind <= ATOMIC_TYPE_LAST);
 881         return (atomic_type_properties[kind].flags & flag) != 0;
 882 }
 883
 884 /**
 885  * Returns true if the given type is an integer type.
 886  *
 887  * @param type  The type to check.
 888  * @return True if type is an integer type.
 889  */
 890 bool is_type_integer(const type_t *type)
 891 {
 892         assert(!is_typeref(type));
 893
 894         if (type->kind == TYPE_ENUM)
 895                 return true;
 896         if (type->kind == TYPE_BITFIELD)
 897                 return true;
 898
 899         if (type->kind != TYPE_ATOMIC)
 900                 return false;
 901
 902         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 903 }
 904
 905 /**
 906  * Returns true if the given type is an enum type.
 907  *
 908  * @param type  The type to check.
 909  * @return True if type is an enum type.
 910  */
 911 bool is_type_enum(const type_t *type)
 912 {
 913         assert(!is_typeref(type));
 914         return type->kind == TYPE_ENUM;
 915 }
 916
 917 /**
 918  * Returns true if the given type is an floating point type.
 919  *
 920  * @param type  The type to check.
 921  * @return True if type is a floating point type.
 922  */
 923 bool is_type_float(const type_t *type)
 924 {
 925         assert(!is_typeref(type));
 926
 927         if (type->kind != TYPE_ATOMIC)
 928                 return false;
 929
 930         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 931 }
 932
 933 /**
 934  * Returns true if the given type is an complex type.
 935  *
 936  * @param type  The type to check.
 937  * @return True if type is a complex type.
 938  */
 939 bool is_type_complex(const type_t *type)
 940 {
 941         assert(!is_typeref(type));
 942
 943         if (type->kind != TYPE_ATOMIC)
 944                 return false;
 945
 946         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 947 }
 948
 949 /**
 950  * Returns true if the given type is a signed type.
 951  *
 952  * @param type  The type to check.
 953  * @return True if type is a signed type.
 954  */
 955 bool is_type_signed(const type_t *type)
 956 {
 957         assert(!is_typeref(type));
 958
 959         /* enum types are int for now */
 960         if (type->kind == TYPE_ENUM)
 961                 return true;
 962         if (type->kind == TYPE_BITFIELD)
 963                 return is_type_signed(type->bitfield.base_type);
 964
 965         if (type->kind != TYPE_ATOMIC)
 966                 return false;
 967
 968         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 969 }
 970
 971 /**
 972  * Returns true if the given type represents an arithmetic type.
 973  *
 974  * @param type  The type to check.
 975  * @return True if type represents an arithmetic type.
 976  */
 977 bool is_type_arithmetic(const type_t *type)
 978 {
 979         assert(!is_typeref(type));
 980
 981         switch(type->kind) {
 982         case TYPE_BITFIELD:
 983         case TYPE_ENUM:
 984                 return true;
 985         case TYPE_ATOMIC:
 986                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 987         case TYPE_COMPLEX:
 988                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 989         case TYPE_IMAGINARY:
 990                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 991         default:
 992                 return false;
 993         }
 994 }
 995
 996 /**
 997  * Returns true if the given type is an integer or float type.
 998  *
 999  * @param type  The type to check.
1000  * @return True if type is an integer or float type.
1001  */
1002 bool is_type_real(const type_t *type)
1003 {
1004         /* 6.2.5 (17) */
1005         return is_type_integer(type) || is_type_float(type);
1006 }
1007
1008 /**
1009  * Returns true if the given type represents a scalar type.
1010  *
1011  * @param type  The type to check.
1012  * @return True if type represents a scalar type.
1013  */
1014 bool is_type_scalar(const type_t *type)
1015 {
1016         assert(!is_typeref(type));
1017
1018         switch (type->kind) {
1019         case TYPE_POINTER: return true;
1020         case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1021         default:           break;
1022         }
1023
1024         return is_type_arithmetic(type);
1025 }
1026
1027 /**
1028  * Check if a given type is incomplete.
1029  *
1030  * @param type  The type to check.
1031  * @return True if the given type is incomplete (ie. just forward).
1032  */
1033 bool is_type_incomplete(const type_t *type)
1034 {
1035         assert(!is_typeref(type));
1036
1037         switch(type->kind) {
1038         case TYPE_COMPOUND_STRUCT:
1039         case TYPE_COMPOUND_UNION: {
1040                 const compound_type_t *compound_type = &type->compound;
1041                 return !compound_type->compound->complete;
1042         }
1043         case TYPE_ENUM:
1044                 return false;
1045
1046         case TYPE_ARRAY:
1047                 return type->array.size_expression == NULL
1048                         && !type->array.size_constant;
1049
1050         case TYPE_ATOMIC:
1051                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1052
1053         case TYPE_COMPLEX:
1054                 return type->complex.akind == ATOMIC_TYPE_VOID;
1055
1056         case TYPE_IMAGINARY:
1057                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1058
1059         case TYPE_BITFIELD:
1060         case TYPE_FUNCTION:
1061         case TYPE_POINTER:
1062         case TYPE_REFERENCE:
1063         case TYPE_BUILTIN:
1064         case TYPE_ERROR:
1065                 return false;
1066
1067         case TYPE_TYPEDEF:
1068         case TYPE_TYPEOF:
1069                 panic("is_type_incomplete called without typerefs skipped");
1070         case TYPE_INVALID:
1071                 break;
1072         }
1073
1074         panic("invalid type found");
1075 }
1076
1077 bool is_type_object(const type_t *type)
1078 {
1079         return !is_type_function(type) && !is_type_incomplete(type);
1080 }
1081
1082 bool is_builtin_va_list(type_t *type)
1083 {
1084         type_t *tp = skip_typeref(type);
1085
1086         return tp->kind == type_valist->kind &&
1087                tp->builtin.symbol == type_valist->builtin.symbol;
1088 }
1089
1090 /**
1091  * Check if two function types are compatible.
1092  */
1093 static bool function_types_compatible(const function_type_t *func1,
1094                                       const function_type_t *func2)
1095 {
1096         const type_t* const ret1 = skip_typeref(func1->return_type);
1097         const type_t* const ret2 = skip_typeref(func2->return_type);
1098         if (!types_compatible(ret1, ret2))
1099                 return false;
1100
1101         if (func1->linkage != func2->linkage)
1102                 return false;
1103
1104         cc_kind_t cc1 = func1->calling_convention;
1105         if (cc1 == CC_DEFAULT)
1106                 cc1 = default_calling_convention;
1107         cc_kind_t cc2 = func2->calling_convention;
1108         if (cc2 == CC_DEFAULT)
1109                 cc2 = default_calling_convention;
1110
1111         if (cc1 != cc2)
1112                 return false;
1113
1114         if (func1->variadic != func2->variadic)
1115                 return false;
1116
1117         /* can parameters be compared? */
1118         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1119                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1120                 return true;
1121
1122         /* TODO: handling of unspecified parameters not correct yet */
1123
1124         /* all argument types must be compatible */
1125         function_parameter_t *parameter1 = func1->parameters;
1126         function_parameter_t *parameter2 = func2->parameters;
1127         for ( ; parameter1 != NULL && parameter2 != NULL;
1128                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1129                 type_t *parameter1_type = skip_typeref(parameter1->type);
1130                 type_t *parameter2_type = skip_typeref(parameter2->type);
1131
1132                 parameter1_type = get_unqualified_type(parameter1_type);
1133                 parameter2_type = get_unqualified_type(parameter2_type);
1134
1135                 if (!types_compatible(parameter1_type, parameter2_type))
1136                         return false;
1137         }
1138         /* same number of arguments? */
1139         if (parameter1 != NULL || parameter2 != NULL)
1140                 return false;
1141
1142         return true;
1143 }
1144
1145 /**
1146  * Check if two array types are compatible.
1147  */
1148 static bool array_types_compatible(const array_type_t *array1,
1149                                    const array_type_t *array2)
1150 {
1151         type_t *element_type1 = skip_typeref(array1->element_type);
1152         type_t *element_type2 = skip_typeref(array2->element_type);
1153         if (!types_compatible(element_type1, element_type2))
1154                 return false;
1155
1156         if (!array1->size_constant || !array2->size_constant)
1157                 return true;
1158
1159         return array1->size == array2->size;
1160 }
1161
1162 /**
1163  * Check if two types are compatible.
1164  */
1165 bool types_compatible(const type_t *type1, const type_t *type2)
1166 {
1167         assert(!is_typeref(type1));
1168         assert(!is_typeref(type2));
1169
1170         /* shortcut: the same type is always compatible */
1171         if (type1 == type2)
1172                 return true;
1173
1174         if (!is_type_valid(type1) || !is_type_valid(type2))
1175                 return true;
1176
1177         if (type1->base.qualifiers != type2->base.qualifiers)
1178                 return false;
1179         if (type1->kind != type2->kind)
1180                 return false;
1181
1182         switch (type1->kind) {
1183         case TYPE_FUNCTION:
1184                 return function_types_compatible(&type1->function, &type2->function);
1185         case TYPE_ATOMIC:
1186                 return type1->atomic.akind == type2->atomic.akind;
1187         case TYPE_COMPLEX:
1188                 return type1->complex.akind == type2->complex.akind;
1189         case TYPE_IMAGINARY:
1190                 return type1->imaginary.akind == type2->imaginary.akind;
1191         case TYPE_ARRAY:
1192                 return array_types_compatible(&type1->array, &type2->array);
1193
1194         case TYPE_POINTER: {
1195                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1196                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1197                 return types_compatible(to1, to2);
1198         }
1199
1200         case TYPE_REFERENCE: {
1201                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1202                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1203                 return types_compatible(to1, to2);
1204         }
1205
1206         case TYPE_COMPOUND_STRUCT:
1207         case TYPE_COMPOUND_UNION: {
1208
1209
1210                 break;
1211         }
1212         case TYPE_ENUM:
1213         case TYPE_BUILTIN:
1214                 /* TODO: not implemented */
1215                 break;
1216
1217         case TYPE_BITFIELD:
1218                 /* not sure if this makes sense or is even needed, implement it if you
1219                  * really need it! */
1220                 panic("type compatibility check for bitfield type");
1221
1222         case TYPE_ERROR:
1223                 /* Hmm, the error type should be compatible to all other types */
1224                 return true;
1225         case TYPE_INVALID:
1226                 panic("invalid type found in compatible types");
1227         case TYPE_TYPEDEF:
1228         case TYPE_TYPEOF:
1229                 panic("typerefs not skipped in compatible types?!?");
1230         }
1231
1232         /* TODO: incomplete */
1233         return false;
1234 }
1235
1236 /**
1237  * Skip all typerefs and return the underlying type.
1238  */
1239 type_t *skip_typeref(type_t *type)
1240 {
1241         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1242
1243         while (true) {
1244                 switch (type->kind) {
1245                 case TYPE_ERROR:
1246                         return type;
1247                 case TYPE_TYPEDEF: {
1248                         qualifiers |= type->base.qualifiers;
1249
1250                         const typedef_type_t *typedef_type = &type->typedeft;
1251                         if (typedef_type->resolved_type != NULL) {
1252                                 type = typedef_type->resolved_type;
1253                                 break;
1254                         }
1255                         type = typedef_type->typedefe->type;
1256                         continue;
1257                 }
1258                 case TYPE_TYPEOF:
1259                         qualifiers |= type->base.qualifiers;
1260                         type        = type->typeoft.typeof_type;
1261                         continue;
1262                 default:
1263                         break;
1264                 }
1265                 break;
1266         }
1267
1268         if (qualifiers != TYPE_QUALIFIER_NONE) {
1269                 type_t *const copy = duplicate_type(type);
1270
1271                 /* for const with typedefed array type the element type has to be
1272                  * adjusted */
1273                 if (is_type_array(copy)) {
1274                         type_t *element_type           = copy->array.element_type;
1275                         element_type                   = duplicate_type(element_type);
1276                         element_type->base.qualifiers |= qualifiers;
1277                         copy->array.element_type       = element_type;
1278                 } else {
1279                         copy->base.qualifiers |= qualifiers;
1280                 }
1281
1282                 type = identify_new_type(copy);
1283         }
1284
1285         return type;
1286 }
1287
1288 unsigned get_type_size(type_t *type)
1289 {
1290         switch (type->kind) {
1291         case TYPE_INVALID:
1292                 break;
1293         case TYPE_ERROR:
1294                 return 0;
1295         case TYPE_ATOMIC:
1296                 return get_atomic_type_size(type->atomic.akind);
1297         case TYPE_COMPLEX:
1298                 return get_atomic_type_size(type->complex.akind) * 2;
1299         case TYPE_IMAGINARY:
1300                 return get_atomic_type_size(type->imaginary.akind);
1301         case TYPE_COMPOUND_UNION:
1302                 layout_union_type(&type->compound);
1303                 return type->compound.compound->size;
1304         case TYPE_COMPOUND_STRUCT:
1305                 layout_struct_type(&type->compound);
1306                 return type->compound.compound->size;
1307         case TYPE_ENUM:
1308                 return get_atomic_type_size(type->enumt.akind);
1309         case TYPE_FUNCTION:
1310                 return 0; /* non-const (but "address-const") */
1311         case TYPE_REFERENCE:
1312         case TYPE_POINTER:
1313                 /* TODO: make configurable by backend */
1314                 return 4;
1315         case TYPE_ARRAY: {
1316                 /* TODO: correct if element_type is aligned? */
1317                 il_size_t element_size = get_type_size(type->array.element_type);
1318                 return type->array.size * element_size;
1319         }
1320         case TYPE_BITFIELD:
1321                 return 0;
1322         case TYPE_BUILTIN:
1323                 return get_type_size(type->builtin.real_type);
1324         case TYPE_TYPEDEF:
1325                 return get_type_size(type->typedeft.typedefe->type);
1326         case TYPE_TYPEOF:
1327                 if (type->typeoft.typeof_type) {
1328                         return get_type_size(type->typeoft.typeof_type);
1329                 } else {
1330                         return get_type_size(type->typeoft.expression->base.type);
1331                 }
1332         }
1333         panic("invalid type in get_type_size");
1334 }
1335
1336 unsigned get_type_alignment(type_t *type)
1337 {
1338         switch (type->kind) {
1339         case TYPE_INVALID:
1340                 break;
1341         case TYPE_ERROR:
1342                 return 0;
1343         case TYPE_ATOMIC:
1344                 return get_atomic_type_alignment(type->atomic.akind);
1345         case TYPE_COMPLEX:
1346                 return get_atomic_type_alignment(type->complex.akind);
1347         case TYPE_IMAGINARY:
1348                 return get_atomic_type_alignment(type->imaginary.akind);
1349         case TYPE_COMPOUND_UNION:
1350                 layout_union_type(&type->compound);
1351                 return type->compound.compound->alignment;
1352         case TYPE_COMPOUND_STRUCT:
1353                 layout_struct_type(&type->compound);
1354                 return type->compound.compound->alignment;
1355         case TYPE_ENUM:
1356                 return get_atomic_type_alignment(type->enumt.akind);
1357         case TYPE_FUNCTION:
1358                 /* what is correct here? */
1359                 return 4;
1360         case TYPE_REFERENCE:
1361         case TYPE_POINTER:
1362                 /* TODO: make configurable by backend */
1363                 return 4;
1364         case TYPE_ARRAY:
1365                 return get_type_alignment(type->array.element_type);
1366         case TYPE_BITFIELD:
1367                 return 0;
1368         case TYPE_BUILTIN:
1369                 return get_type_alignment(type->builtin.real_type);
1370         case TYPE_TYPEDEF: {
1371                 il_alignment_t alignment
1372                         = get_type_alignment(type->typedeft.typedefe->type);
1373                 if (type->typedeft.typedefe->alignment > alignment)
1374                         alignment = type->typedeft.typedefe->alignment;
1375
1376                 return alignment;
1377         }
1378         case TYPE_TYPEOF:
1379                 if (type->typeoft.typeof_type) {
1380                         return get_type_alignment(type->typeoft.typeof_type);
1381                 } else {
1382                         return get_type_alignment(type->typeoft.expression->base.type);
1383                 }
1384         }
1385         panic("invalid type in get_type_alignment");
1386 }
1387
1388 decl_modifiers_t get_type_modifiers(const type_t *type)
1389 {
1390         switch(type->kind) {
1391         case TYPE_INVALID:
1392         case TYPE_ERROR:
1393                 break;
1394         case TYPE_COMPOUND_STRUCT:
1395         case TYPE_COMPOUND_UNION:
1396                 return type->compound.compound->modifiers;
1397         case TYPE_FUNCTION:
1398                 return type->function.modifiers;
1399         case TYPE_ENUM:
1400         case TYPE_ATOMIC:
1401         case TYPE_COMPLEX:
1402         case TYPE_IMAGINARY:
1403         case TYPE_REFERENCE:
1404         case TYPE_POINTER:
1405         case TYPE_BITFIELD:
1406         case TYPE_ARRAY:
1407                 return 0;
1408         case TYPE_BUILTIN:
1409                 return get_type_modifiers(type->builtin.real_type);
1410         case TYPE_TYPEDEF: {
1411                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1412                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1413                 return modifiers;
1414         }
1415         case TYPE_TYPEOF:
1416                 if (type->typeoft.typeof_type) {
1417                         return get_type_modifiers(type->typeoft.typeof_type);
1418                 } else {
1419                         return get_type_modifiers(type->typeoft.expression->base.type);
1420                 }
1421         }
1422         panic("invalid type found in get_type_modifiers");
1423 }
1424
1425 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1426 {
1427         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1428
1429         while (true) {
1430                 switch (type->base.kind) {
1431                 case TYPE_ERROR:
1432                         return TYPE_QUALIFIER_NONE;
1433                 case TYPE_TYPEDEF:
1434                         qualifiers |= type->base.qualifiers;
1435                         const typedef_type_t *typedef_type = &type->typedeft;
1436                         if (typedef_type->resolved_type != NULL)
1437                                 type = typedef_type->resolved_type;
1438                         else
1439                                 type = typedef_type->typedefe->type;
1440                         continue;
1441                 case TYPE_TYPEOF:
1442                         type = type->typeoft.typeof_type;
1443                         continue;
1444                 case TYPE_ARRAY:
1445                         if (skip_array_type) {
1446                                 type = type->array.element_type;
1447                                 continue;
1448                         }
1449                         break;
1450                 default:
1451                         break;
1452                 }
1453                 break;
1454         }
1455         return type->base.qualifiers | qualifiers;
1456 }
1457
1458 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1459 {
1460         assert(kind <= ATOMIC_TYPE_LAST);
1461         return atomic_type_properties[kind].size;
1462 }
1463
1464 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1465 {
1466         assert(kind <= ATOMIC_TYPE_LAST);
1467         return atomic_type_properties[kind].alignment;
1468 }
1469
1470 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1471 {
1472         assert(kind <= ATOMIC_TYPE_LAST);
1473         return atomic_type_properties[kind].flags;
1474 }
1475
1476 atomic_type_kind_t get_intptr_kind(void)
1477 {
1478         if (machine_size <= 32)
1479                 return ATOMIC_TYPE_INT;
1480         else if (machine_size <= 64)
1481                 return ATOMIC_TYPE_LONG;
1482         else
1483                 return ATOMIC_TYPE_LONGLONG;
1484 }
1485
1486 atomic_type_kind_t get_uintptr_kind(void)
1487 {
1488         if (machine_size <= 32)
1489                 return ATOMIC_TYPE_UINT;
1490         else if (machine_size <= 64)
1491                 return ATOMIC_TYPE_ULONG;
1492         else
1493                 return ATOMIC_TYPE_ULONGLONG;
1494 }
1495
1496 /**
1497  * Find the atomic type kind representing a given size (signed).
1498  */
1499 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1500 {
1501         static atomic_type_kind_t kinds[32];
1502
1503         assert(size < 32);
1504         atomic_type_kind_t kind = kinds[size];
1505         if (kind == ATOMIC_TYPE_INVALID) {
1506                 static const atomic_type_kind_t possible_kinds[] = {
1507                         ATOMIC_TYPE_SCHAR,
1508                         ATOMIC_TYPE_SHORT,
1509                         ATOMIC_TYPE_INT,
1510                         ATOMIC_TYPE_LONG,
1511                         ATOMIC_TYPE_LONGLONG
1512                 };
1513                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1514                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1515                                 kind = possible_kinds[i];
1516                                 break;
1517                         }
1518                 }
1519                 kinds[size] = kind;
1520         }
1521         return kind;
1522 }
1523
1524 /**
1525  * Find the atomic type kind representing a given size (signed).
1526  */
1527 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1528 {
1529         static atomic_type_kind_t kinds[32];
1530
1531         assert(size < 32);
1532         atomic_type_kind_t kind = kinds[size];
1533         if (kind == ATOMIC_TYPE_INVALID) {
1534                 static const atomic_type_kind_t possible_kinds[] = {
1535                         ATOMIC_TYPE_UCHAR,
1536                         ATOMIC_TYPE_USHORT,
1537                         ATOMIC_TYPE_UINT,
1538                         ATOMIC_TYPE_ULONG,
1539                         ATOMIC_TYPE_ULONGLONG
1540                 };
1541                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1542                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1543                                 kind = possible_kinds[i];
1544                                 break;
1545                         }
1546                 }
1547                 kinds[size] = kind;
1548         }
1549         return kind;
1550 }
1551
1552 /**
1553  * Hash the given type and return the "singleton" version
1554  * of it.
1555  */
1556 type_t *identify_new_type(type_t *type)
1557 {
1558         type_t *result = typehash_insert(type);
1559         if (result != type) {
1560                 obstack_free(type_obst, type);
1561         }
1562         return result;
1563 }
1564
1565 /**
1566  * Creates a new atomic type.
1567  *
1568  * @param akind       The kind of the atomic type.
1569  * @param qualifiers  Type qualifiers for the new type.
1570  */
1571 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1572 {
1573         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1574         memset(type, 0, sizeof(atomic_type_t));
1575
1576         type->kind            = TYPE_ATOMIC;
1577         type->base.qualifiers = qualifiers;
1578         type->atomic.akind    = akind;
1579
1580         return identify_new_type(type);
1581 }
1582
1583 /**
1584  * Creates a new complex type.
1585  *
1586  * @param akind       The kind of the atomic type.
1587  * @param qualifiers  Type qualifiers for the new type.
1588  */
1589 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1590 {
1591         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1592         memset(type, 0, sizeof(complex_type_t));
1593
1594         type->kind            = TYPE_COMPLEX;
1595         type->base.qualifiers = qualifiers;
1596         type->complex.akind   = akind;
1597
1598         return identify_new_type(type);
1599 }
1600
1601 /**
1602  * Creates a new imaginary type.
1603  *
1604  * @param akind       The kind of the atomic type.
1605  * @param qualifiers  Type qualifiers for the new type.
1606  */
1607 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1608 {
1609         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1610         memset(type, 0, sizeof(imaginary_type_t));
1611
1612         type->kind            = TYPE_IMAGINARY;
1613         type->base.qualifiers = qualifiers;
1614         type->imaginary.akind = akind;
1615
1616         return identify_new_type(type);
1617 }
1618
1619 /**
1620  * Creates a new pointer type.
1621  *
1622  * @param points_to   The points-to type for the new type.
1623  * @param qualifiers  Type qualifiers for the new type.
1624  */
1625 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1626 {
1627         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1628         memset(type, 0, sizeof(pointer_type_t));
1629
1630         type->kind                  = TYPE_POINTER;
1631         type->base.qualifiers       = qualifiers;
1632         type->pointer.points_to     = points_to;
1633         type->pointer.base_variable = NULL;
1634
1635         return identify_new_type(type);
1636 }
1637
1638 /**
1639  * Creates a new reference type.
1640  *
1641  * @param refers_to   The referred-to type for the new type.
1642  */
1643 type_t *make_reference_type(type_t *refers_to)
1644 {
1645         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1646         memset(type, 0, sizeof(reference_type_t));
1647
1648         type->kind                = TYPE_REFERENCE;
1649         type->base.qualifiers     = 0;
1650         type->reference.refers_to = refers_to;
1651
1652         return identify_new_type(type);
1653 }
1654
1655 /**
1656  * Creates a new based pointer type.
1657  *
1658  * @param points_to   The points-to type for the new type.
1659  * @param qualifiers  Type qualifiers for the new type.
1660  * @param variable    The based variable
1661  */
1662 type_t *make_based_pointer_type(type_t *points_to,
1663                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1664 {
1665         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1666         memset(type, 0, sizeof(pointer_type_t));
1667
1668         type->kind                  = TYPE_POINTER;
1669         type->base.qualifiers       = qualifiers;
1670         type->pointer.points_to     = points_to;
1671         type->pointer.base_variable = variable;
1672
1673         return identify_new_type(type);
1674 }
1675
1676
1677 type_t *make_array_type(type_t *element_type, size_t size,
1678                         type_qualifiers_t qualifiers)
1679 {
1680         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1681         memset(type, 0, sizeof(array_type_t));
1682
1683         type->kind                = TYPE_ARRAY;
1684         type->base.qualifiers     = qualifiers;
1685         type->array.element_type  = element_type;
1686         type->array.size          = size;
1687         type->array.size_constant = true;
1688
1689         return identify_new_type(type);
1690 }
1691
1692 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1693                                        il_alignment_t *struct_alignment,
1694                                                                            bool packed, entity_t *first)
1695 {
1696         il_size_t      offset     = *struct_offset;
1697         il_alignment_t alignment  = *struct_alignment;
1698         size_t         bit_offset = 0;
1699
1700         entity_t *member;
1701         for (member = first; member != NULL; member = member->base.next) {
1702                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1703                         continue;
1704
1705                 type_t *type = member->declaration.type;
1706                 if (type->kind != TYPE_BITFIELD)
1707                         break;
1708
1709                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1710                 il_alignment_t base_alignment = get_type_alignment(base_type);
1711                 il_alignment_t alignment_mask = base_alignment-1;
1712                 if (base_alignment > alignment)
1713                         alignment = base_alignment;
1714
1715                 size_t bit_size = type->bitfield.bit_size;
1716                 if (!packed) {
1717                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1718                         offset     &= ~alignment_mask;
1719                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1720
1721                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1722                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1723                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1724                                 bit_offset = 0;
1725                         }
1726                 }
1727
1728                 if (byte_order_big_endian) {
1729                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1730                         member->compound_member.offset     = offset & ~alignment_mask;
1731                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1732                 } else {
1733                         member->compound_member.offset     = offset;
1734                         member->compound_member.bit_offset = bit_offset;
1735                 }
1736
1737                 bit_offset += bit_size;
1738                 offset     += bit_offset / BITS_PER_BYTE;
1739                 bit_offset %= BITS_PER_BYTE;
1740         }
1741
1742         if (bit_offset > 0)
1743                 offset += 1;
1744
1745         *struct_offset    = offset;
1746         *struct_alignment = alignment;
1747         return member;
1748 }
1749
1750 void layout_struct_type(compound_type_t *type)
1751 {
1752         assert(type->compound != NULL);
1753
1754         compound_t *compound = type->compound;
1755         if (!compound->complete)
1756                 return;
1757         if (type->compound->layouted)
1758                 return;
1759
1760         il_size_t      offset    = 0;
1761         il_alignment_t alignment = compound->alignment;
1762         bool           need_pad  = false;
1763
1764         entity_t *entry = compound->members.entities;
1765         while (entry != NULL) {
1766                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1767                         entry = entry->base.next;
1768                         continue;
1769                 }
1770
1771                 type_t *m_type  = entry->declaration.type;
1772                 type_t *skipped = skip_typeref(m_type);
1773                 if (! is_type_valid(skipped)) {
1774                         entry = entry->base.next;
1775                         continue;
1776                 }
1777
1778                 if (skipped->kind == TYPE_BITFIELD) {
1779                         entry = pack_bitfield_members(&offset, &alignment,
1780                                                       compound->packed, entry);
1781                         continue;
1782                 }
1783
1784                 il_alignment_t m_alignment = get_type_alignment(m_type);
1785                 if (m_alignment > alignment)
1786                         alignment = m_alignment;
1787
1788                 if (!compound->packed) {
1789                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1790
1791                         if (new_offset > offset) {
1792                                 need_pad = true;
1793                                 offset   = new_offset;
1794                         }
1795                 }
1796
1797                 entry->compound_member.offset = offset;
1798                 offset += get_type_size(m_type);
1799
1800                 entry = entry->base.next;
1801         }
1802
1803         if (!compound->packed) {
1804                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1805                 if (new_offset > offset) {
1806                         need_pad = true;
1807                         offset   = new_offset;
1808                 }
1809         }
1810
1811         if (need_pad) {
1812                 if (warning.padded) {
1813                         warningf(&compound->base.source_position, "'%T' needs padding",
1814                                  type);
1815                 }
1816         } else if (compound->packed && warning.packed) {
1817                 warningf(&compound->base.source_position,
1818                          "superfluous packed attribute on '%T'", type);
1819         }
1820
1821         compound->size      = offset;
1822         compound->alignment = alignment;
1823         compound->layouted  = true;
1824 }
1825
1826 void layout_union_type(compound_type_t *type)
1827 {
1828         assert(type->compound != NULL);
1829
1830         compound_t *compound = type->compound;
1831         if (! compound->complete)
1832                 return;
1833
1834         il_size_t      size      = 0;
1835         il_alignment_t alignment = compound->alignment;
1836
1837         entity_t *entry = compound->members.entities;
1838         for (; entry != NULL; entry = entry->base.next) {
1839                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1840                         continue;
1841
1842                 type_t *m_type = entry->declaration.type;
1843                 if (! is_type_valid(skip_typeref(m_type)))
1844                         continue;
1845
1846                 entry->compound_member.offset = 0;
1847                 il_size_t m_size = get_type_size(m_type);
1848                 if (m_size > size)
1849                         size = m_size;
1850                 il_alignment_t m_alignment = get_type_alignment(m_type);
1851                 if (m_alignment > alignment)
1852                         alignment = m_alignment;
1853         }
1854         size = (size + alignment - 1) & -alignment;
1855
1856         compound->size      = size;
1857         compound->alignment = alignment;
1858 }
1859
1860 static function_parameter_t *allocate_parameter(type_t *const type)
1861 {
1862         function_parameter_t *const param
1863                 = obstack_alloc(type_obst, sizeof(*param));
1864         memset(param, 0, sizeof(*param));
1865         param->type = type;
1866         return param;
1867 }
1868
1869 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1870                              type_t *argument_type2)
1871 {
1872         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1873         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1874         parameter1->next = parameter2;
1875
1876         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1877         type->function.return_type = return_type;
1878         type->function.parameters  = parameter1;
1879         type->function.linkage     = LINKAGE_C;
1880
1881         return identify_new_type(type);
1882 }
1883
1884 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1885 {
1886         function_parameter_t *const parameter = allocate_parameter(argument_type);
1887
1888         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1889         type->function.return_type = return_type;
1890         type->function.parameters  = parameter;
1891         type->function.linkage     = LINKAGE_C;
1892
1893         return identify_new_type(type);
1894 }
1895
1896 type_t *make_function_1_type_variadic(type_t *return_type,
1897                                       type_t *argument_type)
1898 {
1899         function_parameter_t *const parameter = allocate_parameter(argument_type);
1900
1901         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1902         type->function.return_type = return_type;
1903         type->function.parameters  = parameter;
1904         type->function.variadic    = true;
1905         type->function.linkage     = LINKAGE_C;
1906
1907         return identify_new_type(type);
1908 }
1909
1910 type_t *make_function_0_type(type_t *return_type)
1911 {
1912         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1913         type->function.return_type = return_type;
1914         type->function.parameters  = NULL;
1915         type->function.linkage     = LINKAGE_C;
1916
1917         return identify_new_type(type);
1918 }
1919
1920 type_t *make_function_type(type_t *return_type, int n_types,
1921                            type_t *const *argument_types,
1922                                                    decl_modifiers_t modifiers)
1923 {
1924         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1925         type->function.return_type = return_type;
1926         type->function.modifiers  |= modifiers;
1927         type->function.linkage     = LINKAGE_C;
1928
1929         function_parameter_t *last  = NULL;
1930         for (int i = 0; i < n_types; ++i) {
1931                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1932                 if (last == NULL) {
1933                         type->function.parameters = parameter;
1934                 } else {
1935                         last->next = parameter;
1936                 }
1937                 last = parameter;
1938         }
1939
1940         return identify_new_type(type);
1941 }
1942
1943 /**
1944  * Debug helper. Prints the given type to stdout.
1945  */
1946 static __attribute__((unused))
1947 void dbg_type(const type_t *type)
1948 {
1949         print_to_file(stderr);
1950         print_type(type);
1951         print_string("\n");
1952         fflush(stderr);
1953 }