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_COMPOUND_STRUCT] = sizeof(compound_type_t),
  56                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  57                 [TYPE_ENUM]            = sizeof(enum_type_t),
  58                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  59                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  60                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  61                 [TYPE_ARRAY]           = sizeof(array_type_t),
  62                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  63                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  64         };
  65         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  66         assert(kind <= TYPE_TYPEOF);
  67         assert(sizes[kind] != 0);
  68         return sizes[kind];
  69 }
  70
  71 type_t *allocate_type_zero(type_kind_t kind)
  72 {
  73         size_t  const size = get_type_struct_size(kind);
  74         type_t *const res  = obstack_alloc(&type_obst, size);
  75         memset(res, 0, size);
  76         res->base.kind = kind;
  77
  78         return res;
  79 }
  80
  81 /**
  82  * Properties of atomic types.
  83  */
  84 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  85         [ATOMIC_TYPE_VOID] = {
  86                 .size      = 0,
  87                 .alignment = 0,
  88                 .flags     = ATOMIC_TYPE_FLAG_NONE,
  89                 .rank      = 0,
  90         },
  91         [ATOMIC_TYPE_BOOL] = {
  92                 .size       = 1,
  93                 .alignment  = 1,
  94                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  95                 .rank       = 1,
  96         },
  97         [ATOMIC_TYPE_CHAR] = {
  98                 .size      = 1,
  99                 .alignment = 1,
 100                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 101                 .rank      = 2,
 102         },
 103         [ATOMIC_TYPE_SCHAR] = {
 104                 .size      = 1,
 105                 .alignment = 1,
 106                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 107                            | ATOMIC_TYPE_FLAG_SIGNED,
 108                 .rank      = 2,
 109         },
 110         [ATOMIC_TYPE_UCHAR] = {
 111                 .size      = 1,
 112                 .alignment = 1,
 113                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114                 .rank      = 2,
 115         },
 116         [ATOMIC_TYPE_SHORT] = {
 117                 .size       = 2,
 118                 .alignment  = 2,
 119                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 120                               | ATOMIC_TYPE_FLAG_SIGNED,
 121                 .rank       = 3,
 122         },
 123         [ATOMIC_TYPE_USHORT] = {
 124                 .size       = 2,
 125                 .alignment  = 2,
 126                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 127                 .rank       = 3,
 128         },
 129         [ATOMIC_TYPE_INT] = {
 130                 .size       = (unsigned) -1,
 131                 .alignment  = (unsigned) -1,
 132                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 133                               | ATOMIC_TYPE_FLAG_SIGNED,
 134                 .rank       = 4,
 135         },
 136         [ATOMIC_TYPE_UINT] = {
 137                 .size       = (unsigned) -1,
 138                 .alignment  = (unsigned) -1,
 139                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 140                 .rank       = 4,
 141         },
 142         [ATOMIC_TYPE_LONG] = {
 143                 .size       = (unsigned) -1,
 144                 .alignment  = (unsigned) -1,
 145                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 146                               | ATOMIC_TYPE_FLAG_SIGNED,
 147                 .rank       = 5,
 148         },
 149         [ATOMIC_TYPE_ULONG] = {
 150                 .size       = (unsigned) -1,
 151                 .alignment  = (unsigned) -1,
 152                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 153                 .rank       = 5,
 154         },
 155         [ATOMIC_TYPE_LONGLONG] = {
 156                 .size       = 8,
 157                 .alignment  = 8,
 158                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 159                               | ATOMIC_TYPE_FLAG_SIGNED,
 160                 .rank       = 6,
 161         },
 162         [ATOMIC_TYPE_ULONGLONG] = {
 163                 .size       = 8,
 164                 .alignment  = 8,
 165                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 166                 .rank       = 6,
 167         },
 168         [ATOMIC_TYPE_FLOAT] = {
 169                 .size       = 4,
 170                 .alignment  = 4,
 171                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 172                               | ATOMIC_TYPE_FLAG_SIGNED,
 173                 .rank       = 0,
 174         },
 175         [ATOMIC_TYPE_DOUBLE] = {
 176                 .size       = 8,
 177                 .alignment  = 8,
 178                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 179                               | ATOMIC_TYPE_FLAG_SIGNED,
 180                 .rank       = 0,
 181         },
 182         [ATOMIC_TYPE_WCHAR_T] = {
 183                 .size      = (unsigned)-1,
 184                 .alignment = (unsigned)-1,
 185                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 186                 .rank      = (unsigned)-1,
 187         },
 188 };
 189 atomic_type_properties_t pointer_properties = {
 190         .size      = 4,
 191         .alignment = 4,
 192         .flags     = ATOMIC_TYPE_FLAG_NONE,
 193 };
 194
 195 static inline bool is_po2(unsigned x)
 196 {
 197         return (x & (x-1)) == 0;
 198 }
 199
 200 void init_types(unsigned machine_size)
 201 {
 202         obstack_init(&type_obst);
 203
 204         atomic_type_properties_t *props = atomic_type_properties;
 205
 206         /* atempt to set some sane defaults based on machine size */
 207
 208         unsigned int_size   = machine_size < 32 ? 2 : 4;
 209         unsigned long_size  = machine_size < 64 ? 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
 220         pointer_properties.size             = long_size;
 221         pointer_properties.alignment        = long_size;
 222         pointer_properties.struct_alignment = long_size;
 223
 224         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 225         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 226
 227         /* set struct alignments to the same value as alignment */
 228         for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) {
 229                 props[i].struct_alignment = props[i].alignment;
 230         }
 231 }
 232
 233 void exit_types(void)
 234 {
 235         obstack_free(&type_obst, NULL);
 236 }
 237
 238 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 239 {
 240         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 241         if (qualifiers & TYPE_QUALIFIER_CONST) {
 242                 print_string(" const" + sep);
 243                 sep = 0;
 244         }
 245         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 246                 print_string(" volatile" + sep);
 247                 sep = 0;
 248         }
 249         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 250                 print_string(" restrict" + sep);
 251                 sep = 0;
 252         }
 253         if (sep == 0 && q & QUAL_SEP_END)
 254                 print_char(' ');
 255 }
 256
 257 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 258 {
 259         switch(kind) {
 260         case ATOMIC_TYPE_INVALID: break;
 261         case ATOMIC_TYPE_VOID:        return "void";
 262         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 263         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 264         case ATOMIC_TYPE_CHAR:        return "char";
 265         case ATOMIC_TYPE_SCHAR:       return "signed char";
 266         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 267         case ATOMIC_TYPE_INT:         return "int";
 268         case ATOMIC_TYPE_UINT:        return "unsigned int";
 269         case ATOMIC_TYPE_SHORT:       return "short";
 270         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 271         case ATOMIC_TYPE_LONG:        return "long";
 272         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 273         case ATOMIC_TYPE_LONGLONG:    return "long long";
 274         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 275         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 276         case ATOMIC_TYPE_FLOAT:       return "float";
 277         case ATOMIC_TYPE_DOUBLE:      return "double";
 278         }
 279         return "INVALIDATOMIC";
 280 }
 281
 282 /**
 283  * Prints the name of an atomic type kinds.
 284  *
 285  * @param kind  The type kind.
 286  */
 287 static void print_atomic_kinds(atomic_type_kind_t kind)
 288 {
 289         const char *s = get_atomic_kind_name(kind);
 290         print_string(s);
 291 }
 292
 293 /**
 294  * Prints the name of an atomic type.
 295  *
 296  * @param type  The type.
 297  */
 298 static void print_atomic_type(const atomic_type_t *type)
 299 {
 300         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 301         print_atomic_kinds(type->akind);
 302 }
 303
 304 /**
 305  * Prints the name of a complex type.
 306  *
 307  * @param type  The type.
 308  */
 309 static void print_complex_type(const atomic_type_t *type)
 310 {
 311         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 312         print_string("_Complex");
 313         print_atomic_kinds(type->akind);
 314 }
 315
 316 /**
 317  * Prints the name of an imaginary type.
 318  *
 319  * @param type  The type.
 320  */
 321 static void print_imaginary_type(const atomic_type_t *type)
 322 {
 323         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 324         print_string("_Imaginary ");
 325         print_atomic_kinds(type->akind);
 326 }
 327
 328 /**
 329  * Print the first part (the prefix) of a type.
 330  *
 331  * @param type   The type to print.
 332  */
 333 static void print_function_type_pre(const function_type_t *type)
 334 {
 335         switch (type->linkage) {
 336                 case LINKAGE_C:
 337                         if (c_mode & _CXX)
 338                                 print_string("extern \"C\" ");
 339                         break;
 340
 341                 case LINKAGE_CXX:
 342                         if (!(c_mode & _CXX))
 343                                 print_string("extern \"C++\" ");
 344                         break;
 345         }
 346
 347         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 348
 349         intern_print_type_pre(type->return_type);
 350
 351         cc_kind_t cc = type->calling_convention;
 352 restart:
 353         switch (cc) {
 354         case CC_CDECL:    print_string(" __cdecl");    break;
 355         case CC_STDCALL:  print_string(" __stdcall");  break;
 356         case CC_FASTCALL: print_string(" __fastcall"); break;
 357         case CC_THISCALL: print_string(" __thiscall"); break;
 358         case CC_DEFAULT:
 359                 if (default_calling_convention != CC_CDECL) {
 360                         /* show the default calling convention if its not cdecl */
 361                         cc = default_calling_convention;
 362                         goto restart;
 363                 }
 364                 break;
 365         }
 366 }
 367
 368 /**
 369  * Print the second part (the postfix) of a type.
 370  *
 371  * @param type   The type to print.
 372  */
 373 static void print_function_type_post(const function_type_t *type,
 374                                      const scope_t *parameters)
 375 {
 376         print_string("(");
 377         bool first = true;
 378         if (parameters == NULL) {
 379                 function_parameter_t *parameter = type->parameters;
 380                 for( ; parameter != NULL; parameter = parameter->next) {
 381                         if (first) {
 382                                 first = false;
 383                         } else {
 384                                 print_string(", ");
 385                         }
 386                         print_type(parameter->type);
 387                 }
 388         } else {
 389                 entity_t *parameter = parameters->entities;
 390                 for (; parameter != NULL; parameter = parameter->base.next) {
 391                         if (parameter->kind != ENTITY_PARAMETER)
 392                                 continue;
 393
 394                         if (first) {
 395                                 first = false;
 396                         } else {
 397                                 print_string(", ");
 398                         }
 399                         const type_t *const param_type = parameter->declaration.type;
 400                         if (param_type == NULL) {
 401                                 print_string(parameter->base.symbol->string);
 402                         } else {
 403                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 404                         }
 405                 }
 406         }
 407         if (type->variadic) {
 408                 if (first) {
 409                         first = false;
 410                 } else {
 411                         print_string(", ");
 412                 }
 413                 print_string("...");
 414         }
 415         if (first && !type->unspecified_parameters) {
 416                 print_string("void");
 417         }
 418         print_string(")");
 419
 420         intern_print_type_post(type->return_type);
 421 }
 422
 423 /**
 424  * Prints the prefix part of a pointer type.
 425  *
 426  * @param type   The pointer type.
 427  */
 428 static void print_pointer_type_pre(const pointer_type_t *type)
 429 {
 430         type_t const *const points_to = type->points_to;
 431         intern_print_type_pre(points_to);
 432         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 433                 print_string(" (");
 434         variable_t *const variable = type->base_variable;
 435         if (variable != NULL) {
 436                 print_string(" __based(");
 437                 print_string(variable->base.base.symbol->string);
 438                 print_string(") ");
 439         }
 440         print_string("*");
 441         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 442 }
 443
 444 /**
 445  * Prints the postfix part of a pointer type.
 446  *
 447  * @param type   The pointer type.
 448  */
 449 static void print_pointer_type_post(const pointer_type_t *type)
 450 {
 451         type_t const *const points_to = type->points_to;
 452         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 453                 print_string(")");
 454         intern_print_type_post(points_to);
 455 }
 456
 457 /**
 458  * Prints the prefix part of a reference type.
 459  *
 460  * @param type   The reference type.
 461  */
 462 static void print_reference_type_pre(const reference_type_t *type)
 463 {
 464         type_t const *const refers_to = type->refers_to;
 465         intern_print_type_pre(refers_to);
 466         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 467                 print_string(" (");
 468         print_string("&");
 469 }
 470
 471 /**
 472  * Prints the postfix part of a reference type.
 473  *
 474  * @param type   The reference type.
 475  */
 476 static void print_reference_type_post(const reference_type_t *type)
 477 {
 478         type_t const *const refers_to = type->refers_to;
 479         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 480                 print_string(")");
 481         intern_print_type_post(refers_to);
 482 }
 483
 484 /**
 485  * Prints the prefix part of an array type.
 486  *
 487  * @param type   The array type.
 488  */
 489 static void print_array_type_pre(const array_type_t *type)
 490 {
 491         intern_print_type_pre(type->element_type);
 492 }
 493
 494 /**
 495  * Prints the postfix part of an array type.
 496  *
 497  * @param type   The array type.
 498  */
 499 static void print_array_type_post(const array_type_t *type)
 500 {
 501         print_string("[");
 502         if (type->is_static) {
 503                 print_string("static ");
 504         }
 505         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 506         if (type->size_expression != NULL
 507                         && (print_implicit_array_size || !type->has_implicit_size)) {
 508                 print_expression(type->size_expression);
 509         }
 510         print_string("]");
 511         intern_print_type_post(type->element_type);
 512 }
 513
 514 void print_enum_definition(const enum_t *enume)
 515 {
 516         print_string("{\n");
 517
 518         change_indent(1);
 519
 520         entity_t *entry = enume->base.next;
 521         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 522                entry = entry->base.next) {
 523
 524                 print_indent();
 525                 print_string(entry->base.symbol->string);
 526                 if (entry->enum_value.value != NULL) {
 527                         print_string(" = ");
 528                         print_expression(entry->enum_value.value);
 529                 }
 530                 print_string(",\n");
 531         }
 532
 533         change_indent(-1);
 534         print_indent();
 535         print_string("}");
 536 }
 537
 538 /**
 539  * Prints an enum type.
 540  *
 541  * @param type  The enum type.
 542  */
 543 static void print_type_enum(const enum_type_t *type)
 544 {
 545         print_type_qualifiers(type->base.base.qualifiers, QUAL_SEP_END);
 546         print_string("enum ");
 547
 548         enum_t   *enume  = type->enume;
 549         symbol_t *symbol = enume->base.symbol;
 550         if (symbol != NULL) {
 551                 print_string(symbol->string);
 552         } else {
 553                 print_enum_definition(enume);
 554         }
 555 }
 556
 557 void print_compound_definition(const compound_t *compound)
 558 {
 559         print_string("{\n");
 560         change_indent(1);
 561
 562         entity_t *entity = compound->members.entities;
 563         for( ; entity != NULL; entity = entity->base.next) {
 564                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 565                         continue;
 566
 567                 print_indent();
 568                 print_entity(entity);
 569                 print_string("\n");
 570         }
 571
 572         change_indent(-1);
 573         print_indent();
 574         print_string("}");
 575         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 576                 print_string("__attribute__((__transparent_union__))");
 577         }
 578 }
 579
 580 /**
 581  * Prints a compound type.
 582  *
 583  * @param type  The compound type.
 584  */
 585 static void print_compound_type(const compound_type_t *type)
 586 {
 587         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 588
 589         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 590                 print_string("struct ");
 591         } else {
 592                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 593                 print_string("union ");
 594         }
 595
 596         compound_t *compound = type->compound;
 597         symbol_t   *symbol   = compound->base.symbol;
 598         if (symbol != NULL) {
 599                 print_string(symbol->string);
 600         } else {
 601                 print_compound_definition(compound);
 602         }
 603 }
 604
 605 /**
 606  * Prints the prefix part of a typedef type.
 607  *
 608  * @param type   The typedef type.
 609  */
 610 static void print_typedef_type_pre(const typedef_type_t *const type)
 611 {
 612         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 613         print_string(type->typedefe->base.symbol->string);
 614 }
 615
 616 /**
 617  * Prints the prefix part of a typeof type.
 618  *
 619  * @param type   The typeof type.
 620  */
 621 static void print_typeof_type_pre(const typeof_type_t *const type)
 622 {
 623         print_string("typeof(");
 624         if (type->expression != NULL) {
 625                 print_expression(type->expression);
 626         } else {
 627                 print_type(type->typeof_type);
 628         }
 629         print_string(")");
 630 }
 631
 632 /**
 633  * Prints the prefix part of a type.
 634  *
 635  * @param type   The type.
 636  */
 637 static void intern_print_type_pre(const type_t *const type)
 638 {
 639         switch(type->kind) {
 640         case TYPE_ERROR:
 641                 print_string("<error>");
 642                 return;
 643         case TYPE_ENUM:
 644                 print_type_enum(&type->enumt);
 645                 return;
 646         case TYPE_ATOMIC:
 647                 print_atomic_type(&type->atomic);
 648                 return;
 649         case TYPE_COMPLEX:
 650                 print_complex_type(&type->atomic);
 651                 return;
 652         case TYPE_IMAGINARY:
 653                 print_imaginary_type(&type->atomic);
 654                 return;
 655         case TYPE_COMPOUND_STRUCT:
 656         case TYPE_COMPOUND_UNION:
 657                 print_compound_type(&type->compound);
 658                 return;
 659         case TYPE_FUNCTION:
 660                 print_function_type_pre(&type->function);
 661                 return;
 662         case TYPE_POINTER:
 663                 print_pointer_type_pre(&type->pointer);
 664                 return;
 665         case TYPE_REFERENCE:
 666                 print_reference_type_pre(&type->reference);
 667                 return;
 668         case TYPE_ARRAY:
 669                 print_array_type_pre(&type->array);
 670                 return;
 671         case TYPE_TYPEDEF:
 672                 print_typedef_type_pre(&type->typedeft);
 673                 return;
 674         case TYPE_TYPEOF:
 675                 print_typeof_type_pre(&type->typeoft);
 676                 return;
 677         }
 678         print_string("unknown");
 679 }
 680
 681 /**
 682  * Prints the postfix part of a type.
 683  *
 684  * @param type   The type.
 685  */
 686 static void intern_print_type_post(const type_t *const type)
 687 {
 688         switch(type->kind) {
 689         case TYPE_FUNCTION:
 690                 print_function_type_post(&type->function, NULL);
 691                 return;
 692         case TYPE_POINTER:
 693                 print_pointer_type_post(&type->pointer);
 694                 return;
 695         case TYPE_REFERENCE:
 696                 print_reference_type_post(&type->reference);
 697                 return;
 698         case TYPE_ARRAY:
 699                 print_array_type_post(&type->array);
 700                 return;
 701         case TYPE_ERROR:
 702         case TYPE_ATOMIC:
 703         case TYPE_COMPLEX:
 704         case TYPE_IMAGINARY:
 705         case TYPE_ENUM:
 706         case TYPE_COMPOUND_STRUCT:
 707         case TYPE_COMPOUND_UNION:
 708         case TYPE_TYPEOF:
 709         case TYPE_TYPEDEF:
 710                 break;
 711         }
 712 }
 713
 714 void print_type(const type_t *const type)
 715 {
 716         print_type_ext(type, NULL, NULL);
 717 }
 718
 719 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 720                     const scope_t *parameters)
 721 {
 722         intern_print_type_pre(type);
 723         if (symbol != NULL) {
 724                 print_string(" ");
 725                 print_string(symbol->string);
 726         }
 727         if (type->kind == TYPE_FUNCTION) {
 728                 print_function_type_post(&type->function, parameters);
 729         } else {
 730                 intern_print_type_post(type);
 731         }
 732 }
 733
 734 type_t *duplicate_type(const type_t *type)
 735 {
 736         size_t size = get_type_struct_size(type->kind);
 737
 738         type_t *const copy = obstack_alloc(&type_obst, size);
 739         memcpy(copy, type, size);
 740         copy->base.firm_type = NULL;
 741
 742         return copy;
 743 }
 744
 745 type_t *get_unqualified_type(type_t *type)
 746 {
 747         assert(!is_typeref(type));
 748
 749         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 750                 return type;
 751
 752         type_t *unqualified_type          = duplicate_type(type);
 753         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 754
 755         return identify_new_type(unqualified_type);
 756 }
 757
 758 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 759 {
 760         type_t *type = skip_typeref(orig_type);
 761
 762         type_t *copy;
 763         if (is_type_array(type)) {
 764                 /* For array types the element type has to be adjusted */
 765                 type_t *element_type      = type->array.element_type;
 766                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 767
 768                 if (qual_element_type == element_type)
 769                         return orig_type;
 770
 771                 copy                     = duplicate_type(type);
 772                 copy->array.element_type = qual_element_type;
 773         } else if (is_type_valid(type)) {
 774                 if ((type->base.qualifiers & qual) == (int)qual)
 775                         return orig_type;
 776
 777                 copy                   = duplicate_type(type);
 778                 copy->base.qualifiers |= qual;
 779         } else {
 780                 return type;
 781         }
 782
 783         return identify_new_type(copy);
 784 }
 785
 786 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 787                                   atomic_type_flag_t flag)
 788 {
 789         assert(kind <= ATOMIC_TYPE_LAST);
 790         return (atomic_type_properties[kind].flags & flag) != 0;
 791 }
 792
 793 bool is_type_integer(const type_t *type)
 794 {
 795         assert(!is_typeref(type));
 796
 797         if (type->kind == TYPE_ENUM)
 798                 return true;
 799         if (type->kind != TYPE_ATOMIC)
 800                 return false;
 801
 802         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 803 }
 804
 805 bool is_type_enum(const type_t *type)
 806 {
 807         assert(!is_typeref(type));
 808         return type->kind == TYPE_ENUM;
 809 }
 810
 811 bool is_type_float(const type_t *type)
 812 {
 813         assert(!is_typeref(type));
 814
 815         if (type->kind != TYPE_ATOMIC)
 816                 return false;
 817
 818         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 819 }
 820
 821 bool is_type_complex(const type_t *type)
 822 {
 823         assert(!is_typeref(type));
 824
 825         if (type->kind != TYPE_ATOMIC)
 826                 return false;
 827
 828         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 829 }
 830
 831 bool is_type_signed(const type_t *type)
 832 {
 833         assert(!is_typeref(type));
 834
 835         /* enum types are int for now */
 836         if (type->kind == TYPE_ENUM)
 837                 return true;
 838         if (type->kind != TYPE_ATOMIC)
 839                 return false;
 840
 841         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 842 }
 843
 844 bool is_type_arithmetic(const type_t *type)
 845 {
 846         assert(!is_typeref(type));
 847
 848         switch(type->kind) {
 849         case TYPE_ENUM:
 850                 return true;
 851         case TYPE_ATOMIC:
 852         case TYPE_COMPLEX:
 853         case TYPE_IMAGINARY:
 854                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 855         default:
 856                 return false;
 857         }
 858 }
 859
 860 bool is_type_real(const type_t *type)
 861 {
 862         /* 6.2.5 (17) */
 863         return is_type_integer(type) || is_type_float(type);
 864 }
 865
 866 bool is_type_scalar(const type_t *type)
 867 {
 868         assert(!is_typeref(type));
 869
 870         if (type->kind == TYPE_POINTER)
 871                 return true;
 872
 873         return is_type_arithmetic(type);
 874 }
 875
 876 bool is_type_incomplete(const type_t *type)
 877 {
 878         assert(!is_typeref(type));
 879
 880         switch(type->kind) {
 881         case TYPE_COMPOUND_STRUCT:
 882         case TYPE_COMPOUND_UNION: {
 883                 const compound_type_t *compound_type = &type->compound;
 884                 return !compound_type->compound->complete;
 885         }
 886         case TYPE_ENUM:
 887                 return false;
 888
 889         case TYPE_ARRAY:
 890                 return type->array.size_expression == NULL
 891                         && !type->array.size_constant;
 892
 893         case TYPE_ATOMIC:
 894         case TYPE_IMAGINARY:
 895         case TYPE_COMPLEX:
 896                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 897
 898         case TYPE_FUNCTION:
 899         case TYPE_POINTER:
 900         case TYPE_REFERENCE:
 901         case TYPE_ERROR:
 902                 return false;
 903
 904         case TYPE_TYPEDEF:
 905         case TYPE_TYPEOF:
 906                 panic("is_type_incomplete called without typerefs skipped");
 907         }
 908
 909         panic("invalid type found");
 910 }
 911
 912 bool is_type_object(const type_t *type)
 913 {
 914         return !is_type_function(type) && !is_type_incomplete(type);
 915 }
 916
 917 /**
 918  * Check if two function types are compatible.
 919  */
 920 static bool function_types_compatible(const function_type_t *func1,
 921                                       const function_type_t *func2)
 922 {
 923         const type_t* const ret1 = skip_typeref(func1->return_type);
 924         const type_t* const ret2 = skip_typeref(func2->return_type);
 925         if (!types_compatible(ret1, ret2))
 926                 return false;
 927
 928         if (func1->linkage != func2->linkage)
 929                 return false;
 930
 931         cc_kind_t cc1 = func1->calling_convention;
 932         if (cc1 == CC_DEFAULT)
 933                 cc1 = default_calling_convention;
 934         cc_kind_t cc2 = func2->calling_convention;
 935         if (cc2 == CC_DEFAULT)
 936                 cc2 = default_calling_convention;
 937
 938         if (cc1 != cc2)
 939                 return false;
 940
 941         if (func1->variadic != func2->variadic)
 942                 return false;
 943
 944         /* can parameters be compared? */
 945         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
 946                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
 947                 return true;
 948
 949         /* TODO: handling of unspecified parameters not correct yet */
 950
 951         /* all argument types must be compatible */
 952         function_parameter_t *parameter1 = func1->parameters;
 953         function_parameter_t *parameter2 = func2->parameters;
 954         for ( ; parameter1 != NULL && parameter2 != NULL;
 955                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 956                 type_t *parameter1_type = skip_typeref(parameter1->type);
 957                 type_t *parameter2_type = skip_typeref(parameter2->type);
 958
 959                 parameter1_type = get_unqualified_type(parameter1_type);
 960                 parameter2_type = get_unqualified_type(parameter2_type);
 961
 962                 if (!types_compatible(parameter1_type, parameter2_type))
 963                         return false;
 964         }
 965         /* same number of arguments? */
 966         if (parameter1 != NULL || parameter2 != NULL)
 967                 return false;
 968
 969         return true;
 970 }
 971
 972 /**
 973  * Check if two array types are compatible.
 974  */
 975 static bool array_types_compatible(const array_type_t *array1,
 976                                    const array_type_t *array2)
 977 {
 978         type_t *element_type1 = skip_typeref(array1->element_type);
 979         type_t *element_type2 = skip_typeref(array2->element_type);
 980         if (!types_compatible(element_type1, element_type2))
 981                 return false;
 982
 983         if (!array1->size_constant || !array2->size_constant)
 984                 return true;
 985
 986         return array1->size == array2->size;
 987 }
 988
 989 bool types_compatible(const type_t *type1, const type_t *type2)
 990 {
 991         assert(!is_typeref(type1));
 992         assert(!is_typeref(type2));
 993
 994         /* shortcut: the same type is always compatible */
 995         if (type1 == type2)
 996                 return true;
 997
 998         if (!is_type_valid(type1) || !is_type_valid(type2))
 999                 return true;
1000
1001         if (type1->base.qualifiers != type2->base.qualifiers)
1002                 return false;
1003         if (type1->kind != type2->kind)
1004                 return false;
1005
1006         switch (type1->kind) {
1007         case TYPE_FUNCTION:
1008                 return function_types_compatible(&type1->function, &type2->function);
1009         case TYPE_ATOMIC:
1010         case TYPE_IMAGINARY:
1011         case TYPE_COMPLEX:
1012                 return type1->atomic.akind == type2->atomic.akind;
1013         case TYPE_ARRAY:
1014                 return array_types_compatible(&type1->array, &type2->array);
1015
1016         case TYPE_POINTER: {
1017                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1018                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1019                 return types_compatible(to1, to2);
1020         }
1021
1022         case TYPE_REFERENCE: {
1023                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1024                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1025                 return types_compatible(to1, to2);
1026         }
1027
1028         case TYPE_COMPOUND_STRUCT:
1029         case TYPE_COMPOUND_UNION: {
1030                 break;
1031         }
1032         case TYPE_ENUM:
1033                 /* TODO: not implemented */
1034                 break;
1035
1036         case TYPE_ERROR:
1037                 /* Hmm, the error type should be compatible to all other types */
1038                 return true;
1039         case TYPE_TYPEDEF:
1040         case TYPE_TYPEOF:
1041                 panic("typerefs not skipped in compatible types?!?");
1042         }
1043
1044         return false;
1045 }
1046
1047 /**
1048  * Skip all typerefs and return the underlying type.
1049  */
1050 type_t *skip_typeref(type_t *type)
1051 {
1052         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1053
1054         while (true) {
1055                 switch (type->kind) {
1056                 case TYPE_ERROR:
1057                         return type;
1058                 case TYPE_TYPEDEF: {
1059                         qualifiers |= type->base.qualifiers;
1060
1061                         const typedef_type_t *typedef_type = &type->typedeft;
1062                         if (typedef_type->resolved_type != NULL) {
1063                                 type = typedef_type->resolved_type;
1064                                 break;
1065                         }
1066                         type = typedef_type->typedefe->type;
1067                         continue;
1068                 }
1069                 case TYPE_TYPEOF:
1070                         qualifiers |= type->base.qualifiers;
1071                         type        = type->typeoft.typeof_type;
1072                         continue;
1073                 default:
1074                         break;
1075                 }
1076                 break;
1077         }
1078
1079         if (qualifiers != TYPE_QUALIFIER_NONE) {
1080                 type_t *const copy = duplicate_type(type);
1081
1082                 /* for const with typedefed array type the element type has to be
1083                  * adjusted */
1084                 if (is_type_array(copy)) {
1085                         type_t *element_type           = copy->array.element_type;
1086                         element_type                   = duplicate_type(element_type);
1087                         element_type->base.qualifiers |= qualifiers;
1088                         copy->array.element_type       = element_type;
1089                 } else {
1090                         copy->base.qualifiers |= qualifiers;
1091                 }
1092
1093                 type = identify_new_type(copy);
1094         }
1095
1096         return type;
1097 }
1098
1099 unsigned get_type_size(type_t *type)
1100 {
1101         switch (type->kind) {
1102         case TYPE_ERROR:
1103                 return 0;
1104         case TYPE_ATOMIC:
1105         case TYPE_IMAGINARY:
1106         case TYPE_ENUM:
1107                 return get_atomic_type_size(type->atomic.akind);
1108         case TYPE_COMPLEX:
1109                 return get_atomic_type_size(type->atomic.akind) * 2;
1110         case TYPE_COMPOUND_UNION:
1111                 layout_union_type(&type->compound);
1112                 return type->compound.compound->size;
1113         case TYPE_COMPOUND_STRUCT:
1114                 layout_struct_type(&type->compound);
1115                 return type->compound.compound->size;
1116         case TYPE_FUNCTION:
1117                 return 0; /* non-const (but "address-const") */
1118         case TYPE_REFERENCE:
1119         case TYPE_POINTER:
1120                 return pointer_properties.size;
1121         case TYPE_ARRAY: {
1122                 /* TODO: correct if element_type is aligned? */
1123                 il_size_t element_size = get_type_size(type->array.element_type);
1124                 return type->array.size * element_size;
1125         }
1126         case TYPE_TYPEDEF:
1127                 return get_type_size(type->typedeft.typedefe->type);
1128         case TYPE_TYPEOF:
1129                 return get_type_size(type->typeoft.typeof_type);
1130         }
1131         panic("invalid type in get_type_size");
1132 }
1133
1134 unsigned get_type_alignment(type_t *type)
1135 {
1136         switch (type->kind) {
1137         case TYPE_ERROR:
1138                 return 0;
1139         case TYPE_ATOMIC:
1140         case TYPE_IMAGINARY:
1141         case TYPE_COMPLEX:
1142         case TYPE_ENUM:
1143                 return get_atomic_type_alignment(type->atomic.akind);
1144         case TYPE_COMPOUND_UNION:
1145                 layout_union_type(&type->compound);
1146                 return type->compound.compound->alignment;
1147         case TYPE_COMPOUND_STRUCT:
1148                 layout_struct_type(&type->compound);
1149                 return type->compound.compound->alignment;
1150         case TYPE_FUNCTION:
1151                 /* gcc says 1 here... */
1152                 return 1;
1153         case TYPE_REFERENCE:
1154         case TYPE_POINTER:
1155                 return pointer_properties.alignment;
1156         case TYPE_ARRAY:
1157                 return get_type_alignment(type->array.element_type);
1158         case TYPE_TYPEDEF: {
1159                 il_alignment_t alignment
1160                         = get_type_alignment(type->typedeft.typedefe->type);
1161                 if (type->typedeft.typedefe->alignment > alignment)
1162                         alignment = type->typedeft.typedefe->alignment;
1163
1164                 return alignment;
1165         }
1166         case TYPE_TYPEOF:
1167                 return get_type_alignment(type->typeoft.typeof_type);
1168         }
1169         panic("invalid type in get_type_alignment");
1170 }
1171
1172 /**
1173  * get alignment of a type when used inside a compound.
1174  * Some ABIs are broken and alignment inside a compound is different from
1175  * recommended alignment of a type
1176  */
1177 static unsigned get_type_alignment_compound(type_t *const type)
1178 {
1179         assert(!is_typeref(type));
1180         if (type->kind == TYPE_ATOMIC)
1181                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1182         return get_type_alignment(type);
1183 }
1184
1185 decl_modifiers_t get_type_modifiers(const type_t *type)
1186 {
1187         switch(type->kind) {
1188         case TYPE_ERROR:
1189                 break;
1190         case TYPE_COMPOUND_STRUCT:
1191         case TYPE_COMPOUND_UNION:
1192                 return type->compound.compound->modifiers;
1193         case TYPE_FUNCTION:
1194                 return type->function.modifiers;
1195         case TYPE_ENUM:
1196         case TYPE_ATOMIC:
1197         case TYPE_COMPLEX:
1198         case TYPE_IMAGINARY:
1199         case TYPE_REFERENCE:
1200         case TYPE_POINTER:
1201         case TYPE_ARRAY:
1202                 return 0;
1203         case TYPE_TYPEDEF: {
1204                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1205                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1206                 return modifiers;
1207         }
1208         case TYPE_TYPEOF:
1209                 return get_type_modifiers(type->typeoft.typeof_type);
1210         }
1211         panic("invalid type found in get_type_modifiers");
1212 }
1213
1214 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1215 {
1216         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1217
1218         while (true) {
1219                 switch (type->base.kind) {
1220                 case TYPE_ERROR:
1221                         return TYPE_QUALIFIER_NONE;
1222                 case TYPE_TYPEDEF:
1223                         qualifiers |= type->base.qualifiers;
1224                         const typedef_type_t *typedef_type = &type->typedeft;
1225                         if (typedef_type->resolved_type != NULL)
1226                                 type = typedef_type->resolved_type;
1227                         else
1228                                 type = typedef_type->typedefe->type;
1229                         continue;
1230                 case TYPE_TYPEOF:
1231                         type = type->typeoft.typeof_type;
1232                         continue;
1233                 case TYPE_ARRAY:
1234                         if (skip_array_type) {
1235                                 type = type->array.element_type;
1236                                 continue;
1237                         }
1238                         break;
1239                 default:
1240                         break;
1241                 }
1242                 break;
1243         }
1244         return type->base.qualifiers | qualifiers;
1245 }
1246
1247 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1248 {
1249         assert(kind <= ATOMIC_TYPE_LAST);
1250         return atomic_type_properties[kind].size;
1251 }
1252
1253 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1254 {
1255         assert(kind <= ATOMIC_TYPE_LAST);
1256         return atomic_type_properties[kind].alignment;
1257 }
1258
1259 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1260 {
1261         assert(kind <= ATOMIC_TYPE_LAST);
1262         return atomic_type_properties[kind].flags;
1263 }
1264
1265 /**
1266  * Find the atomic type kind representing a given size (signed).
1267  */
1268 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1269 {
1270         static atomic_type_kind_t kinds[32];
1271
1272         assert(size < 32);
1273         atomic_type_kind_t kind = kinds[size];
1274         if (kind == ATOMIC_TYPE_INVALID) {
1275                 static const atomic_type_kind_t possible_kinds[] = {
1276                         ATOMIC_TYPE_SCHAR,
1277                         ATOMIC_TYPE_SHORT,
1278                         ATOMIC_TYPE_INT,
1279                         ATOMIC_TYPE_LONG,
1280                         ATOMIC_TYPE_LONGLONG
1281                 };
1282                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1283                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1284                                 kind = possible_kinds[i];
1285                                 break;
1286                         }
1287                 }
1288                 kinds[size] = kind;
1289         }
1290         return kind;
1291 }
1292
1293 /**
1294  * Find the atomic type kind representing a given size (signed).
1295  */
1296 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1297 {
1298         static atomic_type_kind_t kinds[32];
1299
1300         assert(size < 32);
1301         atomic_type_kind_t kind = kinds[size];
1302         if (kind == ATOMIC_TYPE_INVALID) {
1303                 static const atomic_type_kind_t possible_kinds[] = {
1304                         ATOMIC_TYPE_UCHAR,
1305                         ATOMIC_TYPE_USHORT,
1306                         ATOMIC_TYPE_UINT,
1307                         ATOMIC_TYPE_ULONG,
1308                         ATOMIC_TYPE_ULONGLONG
1309                 };
1310                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1311                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1312                                 kind = possible_kinds[i];
1313                                 break;
1314                         }
1315                 }
1316                 kinds[size] = kind;
1317         }
1318         return kind;
1319 }
1320
1321 /**
1322  * Hash the given type and return the "singleton" version
1323  * of it.
1324  */
1325 type_t *identify_new_type(type_t *type)
1326 {
1327         type_t *result = typehash_insert(type);
1328         if (result != type) {
1329                 obstack_free(&type_obst, type);
1330         }
1331         return result;
1332 }
1333
1334 /**
1335  * Creates a new atomic type.
1336  *
1337  * @param akind       The kind of the atomic type.
1338  * @param qualifiers  Type qualifiers for the new type.
1339  */
1340 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1341 {
1342         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1343         type->base.qualifiers = qualifiers;
1344         type->atomic.akind    = akind;
1345
1346         return identify_new_type(type);
1347 }
1348
1349 /**
1350  * Creates a new complex type.
1351  *
1352  * @param akind       The kind of the atomic type.
1353  * @param qualifiers  Type qualifiers for the new type.
1354  */
1355 type_t *make_complex_type(atomic_type_kind_t akind,
1356                           type_qualifiers_t qualifiers)
1357 {
1358         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1359         type->base.qualifiers = qualifiers;
1360         type->atomic.akind   = akind;
1361
1362         return identify_new_type(type);
1363 }
1364
1365 /**
1366  * Creates a new imaginary type.
1367  *
1368  * @param akind       The kind of the atomic type.
1369  * @param qualifiers  Type qualifiers for the new type.
1370  */
1371 type_t *make_imaginary_type(atomic_type_kind_t akind,
1372                             type_qualifiers_t qualifiers)
1373 {
1374         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1375         type->base.qualifiers = qualifiers;
1376         type->atomic.akind = akind;
1377
1378         return identify_new_type(type);
1379 }
1380
1381 /**
1382  * Creates a new pointer type.
1383  *
1384  * @param points_to   The points-to type for the new type.
1385  * @param qualifiers  Type qualifiers for the new type.
1386  */
1387 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1388 {
1389         type_t *const type = allocate_type_zero(TYPE_POINTER);
1390         type->base.qualifiers       = qualifiers;
1391         type->pointer.points_to     = points_to;
1392         type->pointer.base_variable = NULL;
1393
1394         return identify_new_type(type);
1395 }
1396
1397 /**
1398  * Creates a new reference type.
1399  *
1400  * @param refers_to   The referred-to type for the new type.
1401  */
1402 type_t *make_reference_type(type_t *refers_to)
1403 {
1404         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1405         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1406         type->reference.refers_to = refers_to;
1407
1408         return identify_new_type(type);
1409 }
1410
1411 /**
1412  * Creates a new based pointer type.
1413  *
1414  * @param points_to   The points-to type for the new type.
1415  * @param qualifiers  Type qualifiers for the new type.
1416  * @param variable    The based variable
1417  */
1418 type_t *make_based_pointer_type(type_t *points_to,
1419                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1420 {
1421         type_t *const type = allocate_type_zero(TYPE_POINTER);
1422         type->base.qualifiers       = qualifiers;
1423         type->pointer.points_to     = points_to;
1424         type->pointer.base_variable = variable;
1425
1426         return identify_new_type(type);
1427 }
1428
1429
1430 type_t *make_array_type(type_t *element_type, size_t size,
1431                         type_qualifiers_t qualifiers)
1432 {
1433         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1434         type->base.qualifiers     = qualifiers;
1435         type->array.element_type  = element_type;
1436         type->array.size          = size;
1437         type->array.size_constant = true;
1438
1439         return identify_new_type(type);
1440 }
1441
1442 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1443                                        il_alignment_t *struct_alignment,
1444                                                                            bool packed, entity_t *first)
1445 {
1446         il_size_t      offset     = *struct_offset;
1447         il_alignment_t alignment  = *struct_alignment;
1448         size_t         bit_offset = 0;
1449
1450         entity_t *member;
1451         for (member = first; member != NULL; member = member->base.next) {
1452                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1453                         continue;
1454                 if (!member->compound_member.bitfield)
1455                         break;
1456
1457                 type_t *const base_type = skip_typeref(member->declaration.type);
1458                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1459                 il_alignment_t alignment_mask = base_alignment-1;
1460                 if (base_alignment > alignment)
1461                         alignment = base_alignment;
1462
1463                 size_t bit_size = member->compound_member.bit_size;
1464                 if (!packed) {
1465                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1466                         offset     &= ~alignment_mask;
1467                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1468
1469                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1470                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1471                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1472                                 bit_offset = 0;
1473                         }
1474                 }
1475
1476                 if (byte_order_big_endian) {
1477                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1478                         member->compound_member.offset     = offset & ~alignment_mask;
1479                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1480                 } else {
1481                         member->compound_member.offset     = offset;
1482                         member->compound_member.bit_offset = bit_offset;
1483                 }
1484
1485                 bit_offset += bit_size;
1486                 offset     += bit_offset / BITS_PER_BYTE;
1487                 bit_offset %= BITS_PER_BYTE;
1488         }
1489
1490         if (bit_offset > 0)
1491                 offset += 1;
1492
1493         *struct_offset    = offset;
1494         *struct_alignment = alignment;
1495         return member;
1496 }
1497
1498 void layout_struct_type(compound_type_t *type)
1499 {
1500         assert(type->compound != NULL);
1501
1502         compound_t *compound = type->compound;
1503         if (!compound->complete)
1504                 return;
1505         if (type->compound->layouted)
1506                 return;
1507
1508         il_size_t      offset    = 0;
1509         il_alignment_t alignment = compound->alignment;
1510         bool           need_pad  = false;
1511
1512         entity_t *entry = compound->members.entities;
1513         while (entry != NULL) {
1514                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1515                         entry = entry->base.next;
1516                         continue;
1517                 }
1518
1519                 type_t *const m_type  = skip_typeref(entry->declaration.type);
1520                 if (!is_type_valid(m_type)) {
1521                         entry = entry->base.next;
1522                         continue;
1523                 }
1524
1525                 if (entry->compound_member.bitfield) {
1526                         entry = pack_bitfield_members(&offset, &alignment,
1527                                                       compound->packed, entry);
1528                         continue;
1529                 }
1530
1531                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1532                 if (m_alignment > alignment)
1533                         alignment = m_alignment;
1534
1535                 if (!compound->packed) {
1536                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1537
1538                         if (new_offset > offset) {
1539                                 need_pad = true;
1540                                 offset   = new_offset;
1541                         }
1542                 }
1543
1544                 entry->compound_member.offset = offset;
1545                 offset += get_type_size(m_type);
1546
1547                 entry = entry->base.next;
1548         }
1549
1550         if (!compound->packed) {
1551                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1552                 if (new_offset > offset) {
1553                         need_pad = true;
1554                         offset   = new_offset;
1555                 }
1556         }
1557
1558         source_position_t const *const pos = &compound->base.source_position;
1559         if (need_pad) {
1560                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1561         } else if (compound->packed) {
1562                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1563         }
1564
1565         compound->size      = offset;
1566         compound->alignment = alignment;
1567         compound->layouted  = true;
1568 }
1569
1570 void layout_union_type(compound_type_t *type)
1571 {
1572         assert(type->compound != NULL);
1573
1574         compound_t *compound = type->compound;
1575         if (! compound->complete)
1576                 return;
1577
1578         il_size_t      size      = 0;
1579         il_alignment_t alignment = compound->alignment;
1580
1581         entity_t *entry = compound->members.entities;
1582         for (; entry != NULL; entry = entry->base.next) {
1583                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1584                         continue;
1585
1586                 type_t *m_type = skip_typeref(entry->declaration.type);
1587                 if (! is_type_valid(skip_typeref(m_type)))
1588                         continue;
1589
1590                 entry->compound_member.offset = 0;
1591                 il_size_t m_size = get_type_size(m_type);
1592                 if (m_size > size)
1593                         size = m_size;
1594                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1595                 if (m_alignment > alignment)
1596                         alignment = m_alignment;
1597         }
1598         size = (size + alignment - 1) & -alignment;
1599
1600         compound->size      = size;
1601         compound->alignment = alignment;
1602 }
1603
1604 function_parameter_t *allocate_parameter(type_t *const type)
1605 {
1606         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1607         memset(param, 0, sizeof(*param));
1608         param->type = type;
1609         return param;
1610 }
1611
1612 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1613                              type_t *argument_type2, decl_modifiers_t modifiers)
1614 {
1615         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1616         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1617         parameter1->next = parameter2;
1618
1619         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1620         type->function.return_type = return_type;
1621         type->function.parameters  = parameter1;
1622         type->function.modifiers  |= modifiers;
1623         type->function.linkage     = LINKAGE_C;
1624
1625         return identify_new_type(type);
1626 }
1627
1628 type_t *make_function_1_type(type_t *return_type, type_t *argument_type,
1629                              decl_modifiers_t modifiers)
1630 {
1631         function_parameter_t *const parameter = allocate_parameter(argument_type);
1632
1633         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1634         type->function.return_type = return_type;
1635         type->function.parameters  = parameter;
1636         type->function.modifiers  |= modifiers;
1637         type->function.linkage     = LINKAGE_C;
1638
1639         return identify_new_type(type);
1640 }
1641
1642 type_t *make_function_1_type_variadic(type_t *return_type,
1643                                       type_t *argument_type,
1644                                       decl_modifiers_t modifiers)
1645 {
1646         function_parameter_t *const parameter = allocate_parameter(argument_type);
1647
1648         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1649         type->function.return_type = return_type;
1650         type->function.parameters  = parameter;
1651         type->function.variadic    = true;
1652         type->function.modifiers  |= modifiers;
1653         type->function.linkage     = LINKAGE_C;
1654
1655         return identify_new_type(type);
1656 }
1657
1658 type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers)
1659 {
1660         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1661         type->function.return_type = return_type;
1662         type->function.parameters  = NULL;
1663         type->function.modifiers  |= modifiers;
1664         type->function.linkage     = LINKAGE_C;
1665
1666         return identify_new_type(type);
1667 }
1668
1669 type_t *make_function_type(type_t *return_type, int n_types,
1670                            type_t *const *argument_types,
1671                                                    decl_modifiers_t modifiers)
1672 {
1673         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1674         type->function.return_type = return_type;
1675         type->function.modifiers  |= modifiers;
1676         type->function.linkage     = LINKAGE_C;
1677
1678         function_parameter_t **anchor = &type->function.parameters;
1679         for (int i = 0; i < n_types; ++i) {
1680                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1681                 *anchor = parameter;
1682                 anchor  = &parameter->next;
1683         }
1684
1685         return identify_new_type(type);
1686 }
1687
1688 /**
1689  * Debug helper. Prints the given type to stdout.
1690  */
1691 static __attribute__((unused))
1692 void dbg_type(const type_t *type)
1693 {
1694         print_to_file(stderr);
1695         print_type(type);
1696         print_string("\n");
1697         fflush(stderr);
1698 }