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
  37 /** The default calling convention. */
  38 cc_kind_t default_calling_convention = CC_CDECL;
  39
  40 static struct obstack type_obst;
  41 static bool           print_implicit_array_size = false;
  42
  43 static void intern_print_type_pre(const type_t *type);
  44 static void intern_print_type_post(const type_t *type);
  45
  46 /**
  47  * Returns the size of a type node.
  48  *
  49  * @param kind  the type kind
  50  */
  51 static size_t get_type_struct_size(type_kind_t kind)
  52 {
  53         static const size_t sizes[] = {
  54                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  55                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  56                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  57                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  58                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  59                 [TYPE_ENUM]            = sizeof(enum_type_t),
  60                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  61                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  62                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  63                 [TYPE_ARRAY]           = sizeof(array_type_t),
  64                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  65                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  66         };
  67         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  68         assert(kind <= TYPE_TYPEOF);
  69         assert(sizes[kind] != 0);
  70         return sizes[kind];
  71 }
  72
  73 type_t *allocate_type_zero(type_kind_t kind)
  74 {
  75         size_t  const size = get_type_struct_size(kind);
  76         type_t *const res  = obstack_alloc(&type_obst, size);
  77         memset(res, 0, size);
  78         res->base.kind = kind;
  79
  80         return res;
  81 }
  82
  83 /**
  84  * Properties of atomic types.
  85  */
  86 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  87         [ATOMIC_TYPE_VOID] = {
  88                 .size      = 0,
  89                 .alignment = 0,
  90                 .flags     = ATOMIC_TYPE_FLAG_NONE
  91         },
  92         [ATOMIC_TYPE_WCHAR_T] = {
  93                 .size      = (unsigned)-1,
  94                 .alignment = (unsigned)-1,
  95                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  96         },
  97         [ATOMIC_TYPE_CHAR] = {
  98                 .size      = 1,
  99                 .alignment = 1,
 100                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 101         },
 102         [ATOMIC_TYPE_SCHAR] = {
 103                 .size      = 1,
 104                 .alignment = 1,
 105                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 106                            | ATOMIC_TYPE_FLAG_SIGNED,
 107         },
 108         [ATOMIC_TYPE_UCHAR] = {
 109                 .size      = 1,
 110                 .alignment = 1,
 111                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 112         },
 113         [ATOMIC_TYPE_SHORT] = {
 114                 .size       = 2,
 115                 .alignment  = 2,
 116                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 117                               | ATOMIC_TYPE_FLAG_SIGNED
 118         },
 119         [ATOMIC_TYPE_USHORT] = {
 120                 .size       = 2,
 121                 .alignment  = 2,
 122                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 123         },
 124         [ATOMIC_TYPE_INT] = {
 125                 .size       = (unsigned) -1,
 126                 .alignment  = (unsigned) -1,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 128                               | ATOMIC_TYPE_FLAG_SIGNED,
 129         },
 130         [ATOMIC_TYPE_UINT] = {
 131                 .size       = (unsigned) -1,
 132                 .alignment  = (unsigned) -1,
 133                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 134         },
 135         [ATOMIC_TYPE_LONG] = {
 136                 .size       = (unsigned) -1,
 137                 .alignment  = (unsigned) -1,
 138                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 139                               | ATOMIC_TYPE_FLAG_SIGNED,
 140         },
 141         [ATOMIC_TYPE_ULONG] = {
 142                 .size       = (unsigned) -1,
 143                 .alignment  = (unsigned) -1,
 144                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 145         },
 146         [ATOMIC_TYPE_BOOL] = {
 147                 .size       = 1,
 148                 .alignment  = 1,
 149                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 150         },
 151         [ATOMIC_TYPE_FLOAT] = {
 152                 .size       = 4,
 153                 .alignment  = 4,
 154                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 155                               | ATOMIC_TYPE_FLAG_SIGNED,
 156         },
 157         [ATOMIC_TYPE_DOUBLE] = {
 158                 .size       = 8,
 159                 .alignment  = 8,
 160                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 161                               | ATOMIC_TYPE_FLAG_SIGNED,
 162         },
 163 };
 164 atomic_type_properties_t pointer_properties = {
 165         .size      = 4,
 166         .alignment = 4,
 167         .flags     = ATOMIC_TYPE_FLAG_NONE,
 168 };
 169
 170 static inline bool is_po2(unsigned x)
 171 {
 172         return (x & (x-1)) == 0;
 173 }
 174
 175 void init_types(unsigned machine_size)
 176 {
 177         obstack_init(&type_obst);
 178
 179         atomic_type_properties_t *props = atomic_type_properties;
 180
 181         /* atempt to set some sane defaults based on machine size */
 182
 183         unsigned int_size   = machine_size < 32 ? 2 : 4;
 184         unsigned long_size  = machine_size < 64 ? 4 : 8;
 185
 186         props[ATOMIC_TYPE_INT].size        = int_size;
 187         props[ATOMIC_TYPE_INT].alignment   = int_size;
 188         props[ATOMIC_TYPE_UINT].size       = int_size;
 189         props[ATOMIC_TYPE_UINT].alignment  = int_size;
 190         props[ATOMIC_TYPE_LONG].size       = long_size;
 191         props[ATOMIC_TYPE_LONG].alignment  = long_size;
 192         props[ATOMIC_TYPE_ULONG].size      = long_size;
 193         props[ATOMIC_TYPE_ULONG].alignment = long_size;
 194
 195         pointer_properties.size             = long_size;
 196         pointer_properties.alignment        = long_size;
 197         pointer_properties.struct_alignment = long_size;
 198
 199         props[ATOMIC_TYPE_LONGLONG]    = props[ATOMIC_TYPE_LONG];
 200         props[ATOMIC_TYPE_ULONGLONG]   = props[ATOMIC_TYPE_ULONG];
 201         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 202         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 203
 204         /* set struct alignments to the same value as alignment */
 205         for (size_t i = 0;
 206              i < sizeof(atomic_type_properties)/sizeof(atomic_type_properties[0]);
 207              ++i) {
 208                 props[i].struct_alignment = props[i].alignment;
 209         }
 210 }
 211
 212 void exit_types(void)
 213 {
 214         obstack_free(&type_obst, NULL);
 215 }
 216
 217 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 218 {
 219         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 220         if (qualifiers & TYPE_QUALIFIER_CONST) {
 221                 print_string(" const" + sep);
 222                 sep = 0;
 223         }
 224         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 225                 print_string(" volatile" + sep);
 226                 sep = 0;
 227         }
 228         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 229                 print_string(" restrict" + sep);
 230                 sep = 0;
 231         }
 232         if (sep == 0 && q & QUAL_SEP_END)
 233                 print_char(' ');
 234 }
 235
 236 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 237 {
 238         switch(kind) {
 239         case ATOMIC_TYPE_INVALID: break;
 240         case ATOMIC_TYPE_VOID:        return "void";
 241         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 242         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 243         case ATOMIC_TYPE_CHAR:        return "char";
 244         case ATOMIC_TYPE_SCHAR:       return "signed char";
 245         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 246         case ATOMIC_TYPE_INT:         return "int";
 247         case ATOMIC_TYPE_UINT:        return "unsigned int";
 248         case ATOMIC_TYPE_SHORT:       return "short";
 249         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 250         case ATOMIC_TYPE_LONG:        return "long";
 251         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 252         case ATOMIC_TYPE_LONGLONG:    return "long long";
 253         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 254         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 255         case ATOMIC_TYPE_FLOAT:       return "float";
 256         case ATOMIC_TYPE_DOUBLE:      return "double";
 257         }
 258         return "INVALIDATOMIC";
 259 }
 260
 261 /**
 262  * Prints the name of an atomic type kinds.
 263  *
 264  * @param kind  The type kind.
 265  */
 266 static void print_atomic_kinds(atomic_type_kind_t kind)
 267 {
 268         const char *s = get_atomic_kind_name(kind);
 269         print_string(s);
 270 }
 271
 272 /**
 273  * Prints the name of an atomic type.
 274  *
 275  * @param type  The type.
 276  */
 277 static void print_atomic_type(const atomic_type_t *type)
 278 {
 279         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 280         print_atomic_kinds(type->akind);
 281 }
 282
 283 /**
 284  * Prints the name of a complex type.
 285  *
 286  * @param type  The type.
 287  */
 288 static void print_complex_type(const complex_type_t *type)
 289 {
 290         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 291         print_string("_Complex");
 292         print_atomic_kinds(type->akind);
 293 }
 294
 295 /**
 296  * Prints the name of an imaginary type.
 297  *
 298  * @param type  The type.
 299  */
 300 static void print_imaginary_type(const imaginary_type_t *type)
 301 {
 302         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 303         print_string("_Imaginary ");
 304         print_atomic_kinds(type->akind);
 305 }
 306
 307 /**
 308  * Print the first part (the prefix) of a type.
 309  *
 310  * @param type   The type to print.
 311  */
 312 static void print_function_type_pre(const function_type_t *type)
 313 {
 314         switch (type->linkage) {
 315                 case LINKAGE_INVALID:
 316                         break;
 317
 318                 case LINKAGE_C:
 319                         if (c_mode & _CXX)
 320                                 print_string("extern \"C\" ");
 321                         break;
 322
 323                 case LINKAGE_CXX:
 324                         if (!(c_mode & _CXX))
 325                                 print_string("extern \"C++\" ");
 326                         break;
 327         }
 328
 329         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 330
 331         intern_print_type_pre(type->return_type);
 332
 333         cc_kind_t cc = type->calling_convention;
 334 restart:
 335         switch (cc) {
 336         case CC_CDECL:    print_string(" __cdecl");    break;
 337         case CC_STDCALL:  print_string(" __stdcall");  break;
 338         case CC_FASTCALL: print_string(" __fastcall"); break;
 339         case CC_THISCALL: print_string(" __thiscall"); break;
 340         case CC_DEFAULT:
 341                 if (default_calling_convention != CC_CDECL) {
 342                         /* show the default calling convention if its not cdecl */
 343                         cc = default_calling_convention;
 344                         goto restart;
 345                 }
 346                 break;
 347         }
 348 }
 349
 350 /**
 351  * Print the second part (the postfix) of a type.
 352  *
 353  * @param type   The type to print.
 354  */
 355 static void print_function_type_post(const function_type_t *type,
 356                                      const scope_t *parameters)
 357 {
 358         print_string("(");
 359         bool first = true;
 360         if (parameters == NULL) {
 361                 function_parameter_t *parameter = type->parameters;
 362                 for( ; parameter != NULL; parameter = parameter->next) {
 363                         if (first) {
 364                                 first = false;
 365                         } else {
 366                                 print_string(", ");
 367                         }
 368                         print_type(parameter->type);
 369                 }
 370         } else {
 371                 entity_t *parameter = parameters->entities;
 372                 for (; parameter != NULL; parameter = parameter->base.next) {
 373                         if (parameter->kind != ENTITY_PARAMETER)
 374                                 continue;
 375
 376                         if (first) {
 377                                 first = false;
 378                         } else {
 379                                 print_string(", ");
 380                         }
 381                         const type_t *const param_type = parameter->declaration.type;
 382                         if (param_type == NULL) {
 383                                 print_string(parameter->base.symbol->string);
 384                         } else {
 385                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 386                         }
 387                 }
 388         }
 389         if (type->variadic) {
 390                 if (first) {
 391                         first = false;
 392                 } else {
 393                         print_string(", ");
 394                 }
 395                 print_string("...");
 396         }
 397         if (first && !type->unspecified_parameters) {
 398                 print_string("void");
 399         }
 400         print_string(")");
 401
 402         intern_print_type_post(type->return_type);
 403 }
 404
 405 /**
 406  * Prints the prefix part of a pointer type.
 407  *
 408  * @param type   The pointer type.
 409  */
 410 static void print_pointer_type_pre(const pointer_type_t *type)
 411 {
 412         type_t const *const points_to = type->points_to;
 413         intern_print_type_pre(points_to);
 414         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 415                 print_string(" (");
 416         variable_t *const variable = type->base_variable;
 417         if (variable != NULL) {
 418                 print_string(" __based(");
 419                 print_string(variable->base.base.symbol->string);
 420                 print_string(") ");
 421         }
 422         print_string("*");
 423         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 424 }
 425
 426 /**
 427  * Prints the postfix part of a pointer type.
 428  *
 429  * @param type   The pointer type.
 430  */
 431 static void print_pointer_type_post(const pointer_type_t *type)
 432 {
 433         type_t const *const points_to = type->points_to;
 434         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 435                 print_string(")");
 436         intern_print_type_post(points_to);
 437 }
 438
 439 /**
 440  * Prints the prefix part of a reference type.
 441  *
 442  * @param type   The reference type.
 443  */
 444 static void print_reference_type_pre(const reference_type_t *type)
 445 {
 446         type_t const *const refers_to = type->refers_to;
 447         intern_print_type_pre(refers_to);
 448         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 449                 print_string(" (");
 450         print_string("&");
 451 }
 452
 453 /**
 454  * Prints the postfix part of a reference type.
 455  *
 456  * @param type   The reference type.
 457  */
 458 static void print_reference_type_post(const reference_type_t *type)
 459 {
 460         type_t const *const refers_to = type->refers_to;
 461         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 462                 print_string(")");
 463         intern_print_type_post(refers_to);
 464 }
 465
 466 /**
 467  * Prints the prefix part of an array type.
 468  *
 469  * @param type   The array type.
 470  */
 471 static void print_array_type_pre(const array_type_t *type)
 472 {
 473         intern_print_type_pre(type->element_type);
 474 }
 475
 476 /**
 477  * Prints the postfix part of an array type.
 478  *
 479  * @param type   The array type.
 480  */
 481 static void print_array_type_post(const array_type_t *type)
 482 {
 483         print_string("[");
 484         if (type->is_static) {
 485                 print_string("static ");
 486         }
 487         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 488         if (type->size_expression != NULL
 489                         && (print_implicit_array_size || !type->has_implicit_size)) {
 490                 print_expression(type->size_expression);
 491         }
 492         print_string("]");
 493         intern_print_type_post(type->element_type);
 494 }
 495
 496 /**
 497  * Prints an enum definition.
 498  *
 499  * @param declaration  The enum's type declaration.
 500  */
 501 void print_enum_definition(const enum_t *enume)
 502 {
 503         print_string("{\n");
 504
 505         change_indent(1);
 506
 507         entity_t *entry = enume->base.next;
 508         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 509                entry = entry->base.next) {
 510
 511                 print_indent();
 512                 print_string(entry->base.symbol->string);
 513                 if (entry->enum_value.value != NULL) {
 514                         print_string(" = ");
 515
 516                         /* skip the implicit cast */
 517                         expression_t *expression = entry->enum_value.value;
 518                         print_expression(expression);
 519                 }
 520                 print_string(",\n");
 521         }
 522
 523         change_indent(-1);
 524         print_indent();
 525         print_string("}");
 526 }
 527
 528 /**
 529  * Prints an enum type.
 530  *
 531  * @param type  The enum type.
 532  */
 533 static void print_type_enum(const enum_type_t *type)
 534 {
 535         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 536         print_string("enum ");
 537
 538         enum_t   *enume  = type->enume;
 539         symbol_t *symbol = enume->base.symbol;
 540         if (symbol != NULL) {
 541                 print_string(symbol->string);
 542         } else {
 543                 print_enum_definition(enume);
 544         }
 545 }
 546
 547 /**
 548  * Print the compound part of a compound type.
 549  */
 550 void print_compound_definition(const compound_t *compound)
 551 {
 552         print_string("{\n");
 553         change_indent(1);
 554
 555         entity_t *entity = compound->members.entities;
 556         for( ; entity != NULL; entity = entity->base.next) {
 557                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 558                         continue;
 559
 560                 print_indent();
 561                 print_entity(entity);
 562                 print_string("\n");
 563         }
 564
 565         change_indent(-1);
 566         print_indent();
 567         print_string("}");
 568         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 569                 print_string("__attribute__((__transparent_union__))");
 570         }
 571 }
 572
 573 /**
 574  * Prints a compound type.
 575  *
 576  * @param type  The compound type.
 577  */
 578 static void print_compound_type(const compound_type_t *type)
 579 {
 580         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 581
 582         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 583                 print_string("struct ");
 584         } else {
 585                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 586                 print_string("union ");
 587         }
 588
 589         compound_t *compound = type->compound;
 590         symbol_t   *symbol   = compound->base.symbol;
 591         if (symbol != NULL) {
 592                 print_string(symbol->string);
 593         } else {
 594                 print_compound_definition(compound);
 595         }
 596 }
 597
 598 /**
 599  * Prints the prefix part of a typedef type.
 600  *
 601  * @param type   The typedef type.
 602  */
 603 static void print_typedef_type_pre(const typedef_type_t *const type)
 604 {
 605         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 606         print_string(type->typedefe->base.symbol->string);
 607 }
 608
 609 /**
 610  * Prints the prefix part of a typeof type.
 611  *
 612  * @param type   The typeof type.
 613  */
 614 static void print_typeof_type_pre(const typeof_type_t *const type)
 615 {
 616         print_string("typeof(");
 617         if (type->expression != NULL) {
 618                 print_expression(type->expression);
 619         } else {
 620                 print_type(type->typeof_type);
 621         }
 622         print_string(")");
 623 }
 624
 625 /**
 626  * Prints the prefix part of a type.
 627  *
 628  * @param type   The type.
 629  */
 630 static void intern_print_type_pre(const type_t *const type)
 631 {
 632         switch(type->kind) {
 633         case TYPE_ERROR:
 634                 print_string("<error>");
 635                 return;
 636         case TYPE_ENUM:
 637                 print_type_enum(&type->enumt);
 638                 return;
 639         case TYPE_ATOMIC:
 640                 print_atomic_type(&type->atomic);
 641                 return;
 642         case TYPE_COMPLEX:
 643                 print_complex_type(&type->complex);
 644                 return;
 645         case TYPE_IMAGINARY:
 646                 print_imaginary_type(&type->imaginary);
 647                 return;
 648         case TYPE_COMPOUND_STRUCT:
 649         case TYPE_COMPOUND_UNION:
 650                 print_compound_type(&type->compound);
 651                 return;
 652         case TYPE_FUNCTION:
 653                 print_function_type_pre(&type->function);
 654                 return;
 655         case TYPE_POINTER:
 656                 print_pointer_type_pre(&type->pointer);
 657                 return;
 658         case TYPE_REFERENCE:
 659                 print_reference_type_pre(&type->reference);
 660                 return;
 661         case TYPE_ARRAY:
 662                 print_array_type_pre(&type->array);
 663                 return;
 664         case TYPE_TYPEDEF:
 665                 print_typedef_type_pre(&type->typedeft);
 666                 return;
 667         case TYPE_TYPEOF:
 668                 print_typeof_type_pre(&type->typeoft);
 669                 return;
 670         }
 671         print_string("unknown");
 672 }
 673
 674 /**
 675  * Prints the postfix part of a type.
 676  *
 677  * @param type   The type.
 678  */
 679 static void intern_print_type_post(const type_t *const type)
 680 {
 681         switch(type->kind) {
 682         case TYPE_FUNCTION:
 683                 print_function_type_post(&type->function, NULL);
 684                 return;
 685         case TYPE_POINTER:
 686                 print_pointer_type_post(&type->pointer);
 687                 return;
 688         case TYPE_REFERENCE:
 689                 print_reference_type_post(&type->reference);
 690                 return;
 691         case TYPE_ARRAY:
 692                 print_array_type_post(&type->array);
 693                 return;
 694         case TYPE_ERROR:
 695         case TYPE_ATOMIC:
 696         case TYPE_COMPLEX:
 697         case TYPE_IMAGINARY:
 698         case TYPE_ENUM:
 699         case TYPE_COMPOUND_STRUCT:
 700         case TYPE_COMPOUND_UNION:
 701         case TYPE_TYPEOF:
 702         case TYPE_TYPEDEF:
 703                 break;
 704         }
 705 }
 706
 707 /**
 708  * Prints a type.
 709  *
 710  * @param type   The type.
 711  */
 712 void print_type(const type_t *const type)
 713 {
 714         print_type_ext(type, NULL, NULL);
 715 }
 716
 717 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 718                     const scope_t *parameters)
 719 {
 720         intern_print_type_pre(type);
 721         if (symbol != NULL) {
 722                 print_string(" ");
 723                 print_string(symbol->string);
 724         }
 725         if (type->kind == TYPE_FUNCTION) {
 726                 print_function_type_post(&type->function, parameters);
 727         } else {
 728                 intern_print_type_post(type);
 729         }
 730 }
 731
 732 /**
 733  * Duplicates a type.
 734  *
 735  * @param type  The type to copy.
 736  * @return A copy of the type.
 737  *
 738  * @note This does not produce a deep copy!
 739  */
 740 type_t *duplicate_type(const type_t *type)
 741 {
 742         size_t size = get_type_struct_size(type->kind);
 743
 744         type_t *const copy = obstack_alloc(&type_obst, size);
 745         memcpy(copy, type, size);
 746         copy->base.firm_type = NULL;
 747
 748         return copy;
 749 }
 750
 751 /**
 752  * Returns the unqualified type of a given type.
 753  *
 754  * @param type  The type.
 755  * @returns The unqualified type.
 756  */
 757 type_t *get_unqualified_type(type_t *type)
 758 {
 759         assert(!is_typeref(type));
 760
 761         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 762                 return type;
 763
 764         type_t *unqualified_type          = duplicate_type(type);
 765         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 766
 767         return identify_new_type(unqualified_type);
 768 }
 769
 770 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 771 {
 772         type_t *type = skip_typeref(orig_type);
 773
 774         type_t *copy;
 775         if (is_type_array(type)) {
 776                 /* For array types the element type has to be adjusted */
 777                 type_t *element_type      = type->array.element_type;
 778                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 779
 780                 if (qual_element_type == element_type)
 781                         return orig_type;
 782
 783                 copy                     = duplicate_type(type);
 784                 copy->array.element_type = qual_element_type;
 785         } else if (is_type_valid(type)) {
 786                 if ((type->base.qualifiers & qual) == (int)qual)
 787                         return orig_type;
 788
 789                 copy                   = duplicate_type(type);
 790                 copy->base.qualifiers |= qual;
 791         } else {
 792                 return type;
 793         }
 794
 795         return identify_new_type(copy);
 796 }
 797
 798 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 799                                   atomic_type_flag_t flag)
 800 {
 801         assert(kind <= ATOMIC_TYPE_LAST);
 802         return (atomic_type_properties[kind].flags & flag) != 0;
 803 }
 804
 805 /**
 806  * Returns true if the given type is an integer type.
 807  *
 808  * @param type  The type to check.
 809  * @return True if type is an integer type.
 810  */
 811 bool is_type_integer(const type_t *type)
 812 {
 813         assert(!is_typeref(type));
 814
 815         if (type->kind == TYPE_ENUM)
 816                 return true;
 817         if (type->kind != TYPE_ATOMIC)
 818                 return false;
 819
 820         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 821 }
 822
 823 /**
 824  * Returns true if the given type is an enum type.
 825  *
 826  * @param type  The type to check.
 827  * @return True if type is an enum type.
 828  */
 829 bool is_type_enum(const type_t *type)
 830 {
 831         assert(!is_typeref(type));
 832         return type->kind == TYPE_ENUM;
 833 }
 834
 835 /**
 836  * Returns true if the given type is an floating point type.
 837  *
 838  * @param type  The type to check.
 839  * @return True if type is a floating point type.
 840  */
 841 bool is_type_float(const type_t *type)
 842 {
 843         assert(!is_typeref(type));
 844
 845         if (type->kind != TYPE_ATOMIC)
 846                 return false;
 847
 848         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 849 }
 850
 851 /**
 852  * Returns true if the given type is an complex type.
 853  *
 854  * @param type  The type to check.
 855  * @return True if type is a complex type.
 856  */
 857 bool is_type_complex(const type_t *type)
 858 {
 859         assert(!is_typeref(type));
 860
 861         if (type->kind != TYPE_ATOMIC)
 862                 return false;
 863
 864         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 865 }
 866
 867 /**
 868  * Returns true if the given type is a signed type.
 869  *
 870  * @param type  The type to check.
 871  * @return True if type is a signed type.
 872  */
 873 bool is_type_signed(const type_t *type)
 874 {
 875         assert(!is_typeref(type));
 876
 877         /* enum types are int for now */
 878         if (type->kind == TYPE_ENUM)
 879                 return true;
 880         if (type->kind != TYPE_ATOMIC)
 881                 return false;
 882
 883         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 884 }
 885
 886 /**
 887  * Returns true if the given type represents an arithmetic type.
 888  *
 889  * @param type  The type to check.
 890  * @return True if type represents an arithmetic type.
 891  */
 892 bool is_type_arithmetic(const type_t *type)
 893 {
 894         assert(!is_typeref(type));
 895
 896         switch(type->kind) {
 897         case TYPE_ENUM:
 898                 return true;
 899         case TYPE_ATOMIC:
 900                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 901         case TYPE_COMPLEX:
 902                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 903         case TYPE_IMAGINARY:
 904                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 905         default:
 906                 return false;
 907         }
 908 }
 909
 910 /**
 911  * Returns true if the given type is an integer or float type.
 912  *
 913  * @param type  The type to check.
 914  * @return True if type is an integer or float type.
 915  */
 916 bool is_type_real(const type_t *type)
 917 {
 918         /* 6.2.5 (17) */
 919         return is_type_integer(type) || is_type_float(type);
 920 }
 921
 922 /**
 923  * Returns true if the given type represents a scalar type.
 924  *
 925  * @param type  The type to check.
 926  * @return True if type represents a scalar type.
 927  */
 928 bool is_type_scalar(const type_t *type)
 929 {
 930         assert(!is_typeref(type));
 931
 932         if (type->kind == TYPE_POINTER)
 933                 return true;
 934
 935         return is_type_arithmetic(type);
 936 }
 937
 938 /**
 939  * Check if a given type is incomplete.
 940  *
 941  * @param type  The type to check.
 942  * @return True if the given type is incomplete (ie. just forward).
 943  */
 944 bool is_type_incomplete(const type_t *type)
 945 {
 946         assert(!is_typeref(type));
 947
 948         switch(type->kind) {
 949         case TYPE_COMPOUND_STRUCT:
 950         case TYPE_COMPOUND_UNION: {
 951                 const compound_type_t *compound_type = &type->compound;
 952                 return !compound_type->compound->complete;
 953         }
 954         case TYPE_ENUM:
 955                 return false;
 956
 957         case TYPE_ARRAY:
 958                 return type->array.size_expression == NULL
 959                         && !type->array.size_constant;
 960
 961         case TYPE_ATOMIC:
 962                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 963
 964         case TYPE_COMPLEX:
 965                 return type->complex.akind == ATOMIC_TYPE_VOID;
 966
 967         case TYPE_IMAGINARY:
 968                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 969
 970         case TYPE_FUNCTION:
 971         case TYPE_POINTER:
 972         case TYPE_REFERENCE:
 973         case TYPE_ERROR:
 974                 return false;
 975
 976         case TYPE_TYPEDEF:
 977         case TYPE_TYPEOF:
 978                 panic("is_type_incomplete called without typerefs skipped");
 979         }
 980
 981         panic("invalid type found");
 982 }
 983
 984 bool is_type_object(const type_t *type)
 985 {
 986         return !is_type_function(type) && !is_type_incomplete(type);
 987 }
 988
 989 /**
 990  * Check if two function types are compatible.
 991  */
 992 static bool function_types_compatible(const function_type_t *func1,
 993                                       const function_type_t *func2)
 994 {
 995         const type_t* const ret1 = skip_typeref(func1->return_type);
 996         const type_t* const ret2 = skip_typeref(func2->return_type);
 997         if (!types_compatible(ret1, ret2))
 998                 return false;
 999
1000         if (func1->linkage != func2->linkage)
1001                 return false;
1002
1003         cc_kind_t cc1 = func1->calling_convention;
1004         if (cc1 == CC_DEFAULT)
1005                 cc1 = default_calling_convention;
1006         cc_kind_t cc2 = func2->calling_convention;
1007         if (cc2 == CC_DEFAULT)
1008                 cc2 = default_calling_convention;
1009
1010         if (cc1 != cc2)
1011                 return false;
1012
1013         if (func1->variadic != func2->variadic)
1014                 return false;
1015
1016         /* can parameters be compared? */
1017         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1018                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1019                 return true;
1020
1021         /* TODO: handling of unspecified parameters not correct yet */
1022
1023         /* all argument types must be compatible */
1024         function_parameter_t *parameter1 = func1->parameters;
1025         function_parameter_t *parameter2 = func2->parameters;
1026         for ( ; parameter1 != NULL && parameter2 != NULL;
1027                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1028                 type_t *parameter1_type = skip_typeref(parameter1->type);
1029                 type_t *parameter2_type = skip_typeref(parameter2->type);
1030
1031                 parameter1_type = get_unqualified_type(parameter1_type);
1032                 parameter2_type = get_unqualified_type(parameter2_type);
1033
1034                 if (!types_compatible(parameter1_type, parameter2_type))
1035                         return false;
1036         }
1037         /* same number of arguments? */
1038         if (parameter1 != NULL || parameter2 != NULL)
1039                 return false;
1040
1041         return true;
1042 }
1043
1044 /**
1045  * Check if two array types are compatible.
1046  */
1047 static bool array_types_compatible(const array_type_t *array1,
1048                                    const array_type_t *array2)
1049 {
1050         type_t *element_type1 = skip_typeref(array1->element_type);
1051         type_t *element_type2 = skip_typeref(array2->element_type);
1052         if (!types_compatible(element_type1, element_type2))
1053                 return false;
1054
1055         if (!array1->size_constant || !array2->size_constant)
1056                 return true;
1057
1058         return array1->size == array2->size;
1059 }
1060
1061 /**
1062  * Check if two types are compatible.
1063  */
1064 bool types_compatible(const type_t *type1, const type_t *type2)
1065 {
1066         assert(!is_typeref(type1));
1067         assert(!is_typeref(type2));
1068
1069         /* shortcut: the same type is always compatible */
1070         if (type1 == type2)
1071                 return true;
1072
1073         if (!is_type_valid(type1) || !is_type_valid(type2))
1074                 return true;
1075
1076         if (type1->base.qualifiers != type2->base.qualifiers)
1077                 return false;
1078         if (type1->kind != type2->kind)
1079                 return false;
1080
1081         switch (type1->kind) {
1082         case TYPE_FUNCTION:
1083                 return function_types_compatible(&type1->function, &type2->function);
1084         case TYPE_ATOMIC:
1085                 return type1->atomic.akind == type2->atomic.akind;
1086         case TYPE_COMPLEX:
1087                 return type1->complex.akind == type2->complex.akind;
1088         case TYPE_IMAGINARY:
1089                 return type1->imaginary.akind == type2->imaginary.akind;
1090         case TYPE_ARRAY:
1091                 return array_types_compatible(&type1->array, &type2->array);
1092
1093         case TYPE_POINTER: {
1094                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1095                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1096                 return types_compatible(to1, to2);
1097         }
1098
1099         case TYPE_REFERENCE: {
1100                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1101                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1102                 return types_compatible(to1, to2);
1103         }
1104
1105         case TYPE_COMPOUND_STRUCT:
1106         case TYPE_COMPOUND_UNION: {
1107                 break;
1108         }
1109         case TYPE_ENUM:
1110                 /* TODO: not implemented */
1111                 break;
1112
1113         case TYPE_ERROR:
1114                 /* Hmm, the error type should be compatible to all other types */
1115                 return true;
1116         case TYPE_TYPEDEF:
1117         case TYPE_TYPEOF:
1118                 panic("typerefs not skipped in compatible types?!?");
1119         }
1120
1121         return false;
1122 }
1123
1124 /**
1125  * Skip all typerefs and return the underlying type.
1126  */
1127 type_t *skip_typeref(type_t *type)
1128 {
1129         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1130
1131         while (true) {
1132                 switch (type->kind) {
1133                 case TYPE_ERROR:
1134                         return type;
1135                 case TYPE_TYPEDEF: {
1136                         qualifiers |= type->base.qualifiers;
1137
1138                         const typedef_type_t *typedef_type = &type->typedeft;
1139                         if (typedef_type->resolved_type != NULL) {
1140                                 type = typedef_type->resolved_type;
1141                                 break;
1142                         }
1143                         type = typedef_type->typedefe->type;
1144                         continue;
1145                 }
1146                 case TYPE_TYPEOF:
1147                         qualifiers |= type->base.qualifiers;
1148                         type        = type->typeoft.typeof_type;
1149                         continue;
1150                 default:
1151                         break;
1152                 }
1153                 break;
1154         }
1155
1156         if (qualifiers != TYPE_QUALIFIER_NONE) {
1157                 type_t *const copy = duplicate_type(type);
1158
1159                 /* for const with typedefed array type the element type has to be
1160                  * adjusted */
1161                 if (is_type_array(copy)) {
1162                         type_t *element_type           = copy->array.element_type;
1163                         element_type                   = duplicate_type(element_type);
1164                         element_type->base.qualifiers |= qualifiers;
1165                         copy->array.element_type       = element_type;
1166                 } else {
1167                         copy->base.qualifiers |= qualifiers;
1168                 }
1169
1170                 type = identify_new_type(copy);
1171         }
1172
1173         return type;
1174 }
1175
1176 unsigned get_type_size(type_t *type)
1177 {
1178         switch (type->kind) {
1179         case TYPE_ERROR:
1180                 return 0;
1181         case TYPE_ATOMIC:
1182                 return get_atomic_type_size(type->atomic.akind);
1183         case TYPE_COMPLEX:
1184                 return get_atomic_type_size(type->complex.akind) * 2;
1185         case TYPE_IMAGINARY:
1186                 return get_atomic_type_size(type->imaginary.akind);
1187         case TYPE_COMPOUND_UNION:
1188                 layout_union_type(&type->compound);
1189                 return type->compound.compound->size;
1190         case TYPE_COMPOUND_STRUCT:
1191                 layout_struct_type(&type->compound);
1192                 return type->compound.compound->size;
1193         case TYPE_ENUM:
1194                 return get_atomic_type_size(type->enumt.akind);
1195         case TYPE_FUNCTION:
1196                 return 0; /* non-const (but "address-const") */
1197         case TYPE_REFERENCE:
1198         case TYPE_POINTER:
1199                 return pointer_properties.size;
1200         case TYPE_ARRAY: {
1201                 /* TODO: correct if element_type is aligned? */
1202                 il_size_t element_size = get_type_size(type->array.element_type);
1203                 return type->array.size * element_size;
1204         }
1205         case TYPE_TYPEDEF:
1206                 return get_type_size(type->typedeft.typedefe->type);
1207         case TYPE_TYPEOF:
1208                 if (type->typeoft.typeof_type) {
1209                         return get_type_size(type->typeoft.typeof_type);
1210                 } else {
1211                         return get_type_size(type->typeoft.expression->base.type);
1212                 }
1213         }
1214         panic("invalid type in get_type_size");
1215 }
1216
1217 unsigned get_type_alignment(type_t *type)
1218 {
1219         switch (type->kind) {
1220         case TYPE_ERROR:
1221                 return 0;
1222         case TYPE_ATOMIC:
1223                 return get_atomic_type_alignment(type->atomic.akind);
1224         case TYPE_COMPLEX:
1225                 return get_atomic_type_alignment(type->complex.akind);
1226         case TYPE_IMAGINARY:
1227                 return get_atomic_type_alignment(type->imaginary.akind);
1228         case TYPE_COMPOUND_UNION:
1229                 layout_union_type(&type->compound);
1230                 return type->compound.compound->alignment;
1231         case TYPE_COMPOUND_STRUCT:
1232                 layout_struct_type(&type->compound);
1233                 return type->compound.compound->alignment;
1234         case TYPE_ENUM:
1235                 return get_atomic_type_alignment(type->enumt.akind);
1236         case TYPE_FUNCTION:
1237                 /* gcc says 1 here... */
1238                 return 1;
1239         case TYPE_REFERENCE:
1240         case TYPE_POINTER:
1241                 return pointer_properties.alignment;
1242         case TYPE_ARRAY:
1243                 return get_type_alignment(type->array.element_type);
1244         case TYPE_TYPEDEF: {
1245                 il_alignment_t alignment
1246                         = get_type_alignment(type->typedeft.typedefe->type);
1247                 if (type->typedeft.typedefe->alignment > alignment)
1248                         alignment = type->typedeft.typedefe->alignment;
1249
1250                 return alignment;
1251         }
1252         case TYPE_TYPEOF:
1253                 if (type->typeoft.typeof_type) {
1254                         return get_type_alignment(type->typeoft.typeof_type);
1255                 } else {
1256                         return get_type_alignment(type->typeoft.expression->base.type);
1257                 }
1258         }
1259         panic("invalid type in get_type_alignment");
1260 }
1261
1262 unsigned get_type_alignment_compound(type_t *type)
1263 {
1264         if (type->kind == TYPE_ATOMIC)
1265                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1266         return get_type_alignment(type);
1267 }
1268
1269 decl_modifiers_t get_type_modifiers(const type_t *type)
1270 {
1271         switch(type->kind) {
1272         case TYPE_ERROR:
1273                 break;
1274         case TYPE_COMPOUND_STRUCT:
1275         case TYPE_COMPOUND_UNION:
1276                 return type->compound.compound->modifiers;
1277         case TYPE_FUNCTION:
1278                 return type->function.modifiers;
1279         case TYPE_ENUM:
1280         case TYPE_ATOMIC:
1281         case TYPE_COMPLEX:
1282         case TYPE_IMAGINARY:
1283         case TYPE_REFERENCE:
1284         case TYPE_POINTER:
1285         case TYPE_ARRAY:
1286                 return 0;
1287         case TYPE_TYPEDEF: {
1288                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1289                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1290                 return modifiers;
1291         }
1292         case TYPE_TYPEOF:
1293                 if (type->typeoft.typeof_type) {
1294                         return get_type_modifiers(type->typeoft.typeof_type);
1295                 } else {
1296                         return get_type_modifiers(type->typeoft.expression->base.type);
1297                 }
1298         }
1299         panic("invalid type found in get_type_modifiers");
1300 }
1301
1302 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1303 {
1304         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1305
1306         while (true) {
1307                 switch (type->base.kind) {
1308                 case TYPE_ERROR:
1309                         return TYPE_QUALIFIER_NONE;
1310                 case TYPE_TYPEDEF:
1311                         qualifiers |= type->base.qualifiers;
1312                         const typedef_type_t *typedef_type = &type->typedeft;
1313                         if (typedef_type->resolved_type != NULL)
1314                                 type = typedef_type->resolved_type;
1315                         else
1316                                 type = typedef_type->typedefe->type;
1317                         continue;
1318                 case TYPE_TYPEOF:
1319                         type = type->typeoft.typeof_type;
1320                         continue;
1321                 case TYPE_ARRAY:
1322                         if (skip_array_type) {
1323                                 type = type->array.element_type;
1324                                 continue;
1325                         }
1326                         break;
1327                 default:
1328                         break;
1329                 }
1330                 break;
1331         }
1332         return type->base.qualifiers | qualifiers;
1333 }
1334
1335 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1336 {
1337         assert(kind <= ATOMIC_TYPE_LAST);
1338         return atomic_type_properties[kind].size;
1339 }
1340
1341 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1342 {
1343         assert(kind <= ATOMIC_TYPE_LAST);
1344         return atomic_type_properties[kind].alignment;
1345 }
1346
1347 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1348 {
1349         assert(kind <= ATOMIC_TYPE_LAST);
1350         return atomic_type_properties[kind].flags;
1351 }
1352
1353 /**
1354  * Find the atomic type kind representing a given size (signed).
1355  */
1356 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1357 {
1358         static atomic_type_kind_t kinds[32];
1359
1360         assert(size < 32);
1361         atomic_type_kind_t kind = kinds[size];
1362         if (kind == ATOMIC_TYPE_INVALID) {
1363                 static const atomic_type_kind_t possible_kinds[] = {
1364                         ATOMIC_TYPE_SCHAR,
1365                         ATOMIC_TYPE_SHORT,
1366                         ATOMIC_TYPE_INT,
1367                         ATOMIC_TYPE_LONG,
1368                         ATOMIC_TYPE_LONGLONG
1369                 };
1370                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1371                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1372                                 kind = possible_kinds[i];
1373                                 break;
1374                         }
1375                 }
1376                 kinds[size] = kind;
1377         }
1378         return kind;
1379 }
1380
1381 /**
1382  * Find the atomic type kind representing a given size (signed).
1383  */
1384 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1385 {
1386         static atomic_type_kind_t kinds[32];
1387
1388         assert(size < 32);
1389         atomic_type_kind_t kind = kinds[size];
1390         if (kind == ATOMIC_TYPE_INVALID) {
1391                 static const atomic_type_kind_t possible_kinds[] = {
1392                         ATOMIC_TYPE_UCHAR,
1393                         ATOMIC_TYPE_USHORT,
1394                         ATOMIC_TYPE_UINT,
1395                         ATOMIC_TYPE_ULONG,
1396                         ATOMIC_TYPE_ULONGLONG
1397                 };
1398                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1399                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1400                                 kind = possible_kinds[i];
1401                                 break;
1402                         }
1403                 }
1404                 kinds[size] = kind;
1405         }
1406         return kind;
1407 }
1408
1409 /**
1410  * Hash the given type and return the "singleton" version
1411  * of it.
1412  */
1413 type_t *identify_new_type(type_t *type)
1414 {
1415         type_t *result = typehash_insert(type);
1416         if (result != type) {
1417                 obstack_free(&type_obst, type);
1418         }
1419         return result;
1420 }
1421
1422 /**
1423  * Creates a new atomic type.
1424  *
1425  * @param akind       The kind of the atomic type.
1426  * @param qualifiers  Type qualifiers for the new type.
1427  */
1428 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1429 {
1430         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1431         type->base.qualifiers = qualifiers;
1432         type->atomic.akind    = akind;
1433
1434         return identify_new_type(type);
1435 }
1436
1437 /**
1438  * Creates a new complex type.
1439  *
1440  * @param akind       The kind of the atomic type.
1441  * @param qualifiers  Type qualifiers for the new type.
1442  */
1443 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1444 {
1445         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1446         type->base.qualifiers = qualifiers;
1447         type->complex.akind   = akind;
1448
1449         return identify_new_type(type);
1450 }
1451
1452 /**
1453  * Creates a new imaginary type.
1454  *
1455  * @param akind       The kind of the atomic type.
1456  * @param qualifiers  Type qualifiers for the new type.
1457  */
1458 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1459 {
1460         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1461         type->base.qualifiers = qualifiers;
1462         type->imaginary.akind = akind;
1463
1464         return identify_new_type(type);
1465 }
1466
1467 /**
1468  * Creates a new pointer type.
1469  *
1470  * @param points_to   The points-to type for the new type.
1471  * @param qualifiers  Type qualifiers for the new type.
1472  */
1473 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1474 {
1475         type_t *const type = allocate_type_zero(TYPE_POINTER);
1476         type->base.qualifiers       = qualifiers;
1477         type->pointer.points_to     = points_to;
1478         type->pointer.base_variable = NULL;
1479
1480         return identify_new_type(type);
1481 }
1482
1483 /**
1484  * Creates a new reference type.
1485  *
1486  * @param refers_to   The referred-to type for the new type.
1487  */
1488 type_t *make_reference_type(type_t *refers_to)
1489 {
1490         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1491         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1492         type->reference.refers_to = refers_to;
1493
1494         return identify_new_type(type);
1495 }
1496
1497 /**
1498  * Creates a new based pointer type.
1499  *
1500  * @param points_to   The points-to type for the new type.
1501  * @param qualifiers  Type qualifiers for the new type.
1502  * @param variable    The based variable
1503  */
1504 type_t *make_based_pointer_type(type_t *points_to,
1505                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1506 {
1507         type_t *const type = allocate_type_zero(TYPE_POINTER);
1508         type->base.qualifiers       = qualifiers;
1509         type->pointer.points_to     = points_to;
1510         type->pointer.base_variable = variable;
1511
1512         return identify_new_type(type);
1513 }
1514
1515
1516 type_t *make_array_type(type_t *element_type, size_t size,
1517                         type_qualifiers_t qualifiers)
1518 {
1519         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1520         type->base.qualifiers     = qualifiers;
1521         type->array.element_type  = element_type;
1522         type->array.size          = size;
1523         type->array.size_constant = true;
1524
1525         return identify_new_type(type);
1526 }
1527
1528 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1529                                        il_alignment_t *struct_alignment,
1530                                                                            bool packed, entity_t *first)
1531 {
1532         il_size_t      offset     = *struct_offset;
1533         il_alignment_t alignment  = *struct_alignment;
1534         size_t         bit_offset = 0;
1535
1536         entity_t *member;
1537         for (member = first; member != NULL; member = member->base.next) {
1538                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1539                         continue;
1540                 if (!member->compound_member.bitfield)
1541                         break;
1542
1543                 type_t *base_type = member->declaration.type;
1544                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1545                 il_alignment_t alignment_mask = base_alignment-1;
1546                 if (base_alignment > alignment)
1547                         alignment = base_alignment;
1548
1549                 size_t bit_size = member->compound_member.bit_size;
1550                 if (!packed) {
1551                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1552                         offset     &= ~alignment_mask;
1553                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1554
1555                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1556                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1557                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1558                                 bit_offset = 0;
1559                         }
1560                 }
1561
1562                 if (byte_order_big_endian) {
1563                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1564                         member->compound_member.offset     = offset & ~alignment_mask;
1565                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1566                 } else {
1567                         member->compound_member.offset     = offset;
1568                         member->compound_member.bit_offset = bit_offset;
1569                 }
1570
1571                 bit_offset += bit_size;
1572                 offset     += bit_offset / BITS_PER_BYTE;
1573                 bit_offset %= BITS_PER_BYTE;
1574         }
1575
1576         if (bit_offset > 0)
1577                 offset += 1;
1578
1579         *struct_offset    = offset;
1580         *struct_alignment = alignment;
1581         return member;
1582 }
1583
1584 void layout_struct_type(compound_type_t *type)
1585 {
1586         assert(type->compound != NULL);
1587
1588         compound_t *compound = type->compound;
1589         if (!compound->complete)
1590                 return;
1591         if (type->compound->layouted)
1592                 return;
1593
1594         il_size_t      offset    = 0;
1595         il_alignment_t alignment = compound->alignment;
1596         bool           need_pad  = false;
1597
1598         entity_t *entry = compound->members.entities;
1599         while (entry != NULL) {
1600                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1601                         entry = entry->base.next;
1602                         continue;
1603                 }
1604
1605                 type_t *m_type  = entry->declaration.type;
1606                 type_t *skipped = skip_typeref(m_type);
1607                 if (! is_type_valid(skipped)) {
1608                         entry = entry->base.next;
1609                         continue;
1610                 }
1611
1612                 if (entry->compound_member.bitfield) {
1613                         entry = pack_bitfield_members(&offset, &alignment,
1614                                                       compound->packed, entry);
1615                         continue;
1616                 }
1617
1618                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1619                 if (m_alignment > alignment)
1620                         alignment = m_alignment;
1621
1622                 if (!compound->packed) {
1623                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1624
1625                         if (new_offset > offset) {
1626                                 need_pad = true;
1627                                 offset   = new_offset;
1628                         }
1629                 }
1630
1631                 entry->compound_member.offset = offset;
1632                 offset += get_type_size(m_type);
1633
1634                 entry = entry->base.next;
1635         }
1636
1637         if (!compound->packed) {
1638                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1639                 if (new_offset > offset) {
1640                         need_pad = true;
1641                         offset   = new_offset;
1642                 }
1643         }
1644
1645         source_position_t const *const pos = &compound->base.source_position;
1646         if (need_pad) {
1647                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1648         } else if (compound->packed) {
1649                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1650         }
1651
1652         compound->size      = offset;
1653         compound->alignment = alignment;
1654         compound->layouted  = true;
1655 }
1656
1657 void layout_union_type(compound_type_t *type)
1658 {
1659         assert(type->compound != NULL);
1660
1661         compound_t *compound = type->compound;
1662         if (! compound->complete)
1663                 return;
1664
1665         il_size_t      size      = 0;
1666         il_alignment_t alignment = compound->alignment;
1667
1668         entity_t *entry = compound->members.entities;
1669         for (; entry != NULL; entry = entry->base.next) {
1670                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1671                         continue;
1672
1673                 type_t *m_type = entry->declaration.type;
1674                 if (! is_type_valid(skip_typeref(m_type)))
1675                         continue;
1676
1677                 entry->compound_member.offset = 0;
1678                 il_size_t m_size = get_type_size(m_type);
1679                 if (m_size > size)
1680                         size = m_size;
1681                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1682                 if (m_alignment > alignment)
1683                         alignment = m_alignment;
1684         }
1685         size = (size + alignment - 1) & -alignment;
1686
1687         compound->size      = size;
1688         compound->alignment = alignment;
1689 }
1690
1691 function_parameter_t *allocate_parameter(type_t *const type)
1692 {
1693         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1694         memset(param, 0, sizeof(*param));
1695         param->type = type;
1696         return param;
1697 }
1698
1699 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1700                              type_t *argument_type2)
1701 {
1702         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1703         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1704         parameter1->next = parameter2;
1705
1706         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1707         type->function.return_type = return_type;
1708         type->function.parameters  = parameter1;
1709         type->function.linkage     = LINKAGE_C;
1710
1711         return identify_new_type(type);
1712 }
1713
1714 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1715 {
1716         function_parameter_t *const parameter = allocate_parameter(argument_type);
1717
1718         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1719         type->function.return_type = return_type;
1720         type->function.parameters  = parameter;
1721         type->function.linkage     = LINKAGE_C;
1722
1723         return identify_new_type(type);
1724 }
1725
1726 type_t *make_function_1_type_variadic(type_t *return_type,
1727                                       type_t *argument_type)
1728 {
1729         function_parameter_t *const parameter = allocate_parameter(argument_type);
1730
1731         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1732         type->function.return_type = return_type;
1733         type->function.parameters  = parameter;
1734         type->function.variadic    = true;
1735         type->function.linkage     = LINKAGE_C;
1736
1737         return identify_new_type(type);
1738 }
1739
1740 type_t *make_function_0_type(type_t *return_type)
1741 {
1742         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1743         type->function.return_type = return_type;
1744         type->function.parameters  = NULL;
1745         type->function.linkage     = LINKAGE_C;
1746
1747         return identify_new_type(type);
1748 }
1749
1750 type_t *make_function_type(type_t *return_type, int n_types,
1751                            type_t *const *argument_types,
1752                                                    decl_modifiers_t modifiers)
1753 {
1754         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1755         type->function.return_type = return_type;
1756         type->function.modifiers  |= modifiers;
1757         type->function.linkage     = LINKAGE_C;
1758
1759         function_parameter_t **anchor = &type->function.parameters;
1760         for (int i = 0; i < n_types; ++i) {
1761                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1762                 *anchor = parameter;
1763                 anchor  = &parameter->next;
1764         }
1765
1766         return identify_new_type(type);
1767 }
1768
1769 /**
1770  * Debug helper. Prints the given type to stdout.
1771  */
1772 static __attribute__((unused))
1773 void dbg_type(const type_t *type)
1774 {
1775         print_to_file(stderr);
1776         print_type(type);
1777         print_string("\n");
1778         fflush(stderr);
1779 }