nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36 #include "separator_t.h"
  37
  38 /** The default calling convention. */
  39 cc_kind_t default_calling_convention = CC_CDECL;
  40
  41 static struct obstack type_obst;
  42 static bool           print_implicit_array_size = false;
  43
  44 static void intern_print_type_pre(const type_t *type);
  45 static void intern_print_type_post(const type_t *type);
  46
  47 /**
  48  * Returns the size of a type node.
  49  *
  50  * @param kind  the type kind
  51  */
  52 static size_t get_type_struct_size(type_kind_t kind)
  53 {
  54         static const size_t sizes[] = {
  55                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  56                 [TYPE_IMAGINARY]       = sizeof(atomic_type_t),
  57                 [TYPE_COMPLEX]         = sizeof(atomic_type_t),
  58                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  59                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  60                 [TYPE_ENUM]            = sizeof(enum_type_t),
  61                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  62                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  63                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  64                 [TYPE_ARRAY]           = sizeof(array_type_t),
  65                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  66                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  67         };
  68         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  69         assert(kind <= TYPE_TYPEOF);
  70         assert(sizes[kind] != 0);
  71         return sizes[kind];
  72 }
  73
  74 type_t *allocate_type_zero(type_kind_t kind)
  75 {
  76         size_t  const size = get_type_struct_size(kind);
  77         type_t *const res  = obstack_alloc(&type_obst, size);
  78         memset(res, 0, size);
  79         res->base.kind = kind;
  80
  81         return res;
  82 }
  83
  84 /**
  85  * Properties of atomic types.
  86  */
  87 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  88         [ATOMIC_TYPE_VOID] = {
  89                 .size      = 1,
  90                 .alignment = 1,
  91                 .flags     = ATOMIC_TYPE_FLAG_NONE,
  92                 .rank      = 0,
  93         },
  94         [ATOMIC_TYPE_BOOL] = {
  95                 .size       = 1,
  96                 .alignment  = 1,
  97                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  98                 .rank       = 1,
  99         },
 100         [ATOMIC_TYPE_CHAR] = {
 101                 .size      = 1,
 102                 .alignment = 1,
 103                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 104                 .rank      = 2,
 105         },
 106         [ATOMIC_TYPE_SCHAR] = {
 107                 .size      = 1,
 108                 .alignment = 1,
 109                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 110                            | ATOMIC_TYPE_FLAG_SIGNED,
 111                 .rank      = 2,
 112         },
 113         [ATOMIC_TYPE_UCHAR] = {
 114                 .size      = 1,
 115                 .alignment = 1,
 116                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 117                 .rank      = 2,
 118         },
 119         [ATOMIC_TYPE_SHORT] = {
 120                 .size       = 2,
 121                 .alignment  = 2,
 122                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 123                               | ATOMIC_TYPE_FLAG_SIGNED,
 124                 .rank       = 3,
 125         },
 126         [ATOMIC_TYPE_USHORT] = {
 127                 .size       = 2,
 128                 .alignment  = 2,
 129                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 130                 .rank       = 3,
 131         },
 132         [ATOMIC_TYPE_INT] = {
 133                 .size       = (unsigned) -1,
 134                 .alignment  = (unsigned) -1,
 135                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 136                               | ATOMIC_TYPE_FLAG_SIGNED,
 137                 .rank       = 4,
 138         },
 139         [ATOMIC_TYPE_UINT] = {
 140                 .size       = (unsigned) -1,
 141                 .alignment  = (unsigned) -1,
 142                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 143                 .rank       = 4,
 144         },
 145         [ATOMIC_TYPE_LONG] = {
 146                 .size       = (unsigned) -1,
 147                 .alignment  = (unsigned) -1,
 148                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 149                               | ATOMIC_TYPE_FLAG_SIGNED,
 150                 .rank       = 5,
 151         },
 152         [ATOMIC_TYPE_ULONG] = {
 153                 .size       = (unsigned) -1,
 154                 .alignment  = (unsigned) -1,
 155                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 156                 .rank       = 5,
 157         },
 158         [ATOMIC_TYPE_LONGLONG] = {
 159                 .size       = 8,
 160                 .alignment  = 8,
 161                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 162                               | ATOMIC_TYPE_FLAG_SIGNED,
 163                 .rank       = 6,
 164         },
 165         [ATOMIC_TYPE_ULONGLONG] = {
 166                 .size       = 8,
 167                 .alignment  = 8,
 168                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 169                 .rank       = 6,
 170         },
 171         [ATOMIC_TYPE_FLOAT] = {
 172                 .size       = 4,
 173                 .alignment  = 4,
 174                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 175                               | ATOMIC_TYPE_FLAG_SIGNED,
 176                 .rank       = 0,
 177         },
 178         [ATOMIC_TYPE_DOUBLE] = {
 179                 .size       = 8,
 180                 .alignment  = 8,
 181                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 182                               | ATOMIC_TYPE_FLAG_SIGNED,
 183                 .rank       = 0,
 184         },
 185         [ATOMIC_TYPE_WCHAR_T] = {
 186                 .size      = (unsigned)-1,
 187                 .alignment = (unsigned)-1,
 188                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 189                 .rank      = (unsigned)-1,
 190         },
 191 };
 192 atomic_type_properties_t pointer_properties = {
 193         .size      = 4,
 194         .alignment = 4,
 195         .flags     = ATOMIC_TYPE_FLAG_NONE,
 196 };
 197
 198 static inline bool is_po2(unsigned x)
 199 {
 200         return (x & (x-1)) == 0;
 201 }
 202
 203 void init_types(unsigned machine_size)
 204 {
 205         obstack_init(&type_obst);
 206
 207         atomic_type_properties_t *props = atomic_type_properties;
 208
 209         /* atempt to set some sane defaults based on machine size */
 210
 211         unsigned int_size   = machine_size < 32 ? 2 : 4;
 212         unsigned long_size  = machine_size < 64 ? 4 : 8;
 213
 214         props[ATOMIC_TYPE_INT].size        = int_size;
 215         props[ATOMIC_TYPE_INT].alignment   = int_size;
 216         props[ATOMIC_TYPE_UINT].size       = int_size;
 217         props[ATOMIC_TYPE_UINT].alignment  = int_size;
 218         props[ATOMIC_TYPE_LONG].size       = long_size;
 219         props[ATOMIC_TYPE_LONG].alignment  = long_size;
 220         props[ATOMIC_TYPE_ULONG].size      = long_size;
 221         props[ATOMIC_TYPE_ULONG].alignment = long_size;
 222
 223         pointer_properties.size             = long_size;
 224         pointer_properties.alignment        = long_size;
 225         pointer_properties.struct_alignment = long_size;
 226
 227         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 228         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 229
 230         /* set struct alignments to the same value as alignment */
 231         for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) {
 232                 props[i].struct_alignment = props[i].alignment;
 233         }
 234 }
 235
 236 void exit_types(void)
 237 {
 238         obstack_free(&type_obst, NULL);
 239 }
 240
 241 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 242 {
 243         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 244         if (qualifiers & TYPE_QUALIFIER_CONST) {
 245                 print_string(&" const"[sep]);
 246                 sep = 0;
 247         }
 248         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 249                 print_string(&" volatile"[sep]);
 250                 sep = 0;
 251         }
 252         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 253                 print_string(&" restrict"[sep]);
 254                 sep = 0;
 255         }
 256         if (sep == 0 && q & QUAL_SEP_END)
 257                 print_char(' ');
 258 }
 259
 260 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 261 {
 262         switch(kind) {
 263         case ATOMIC_TYPE_VOID:        return "void";
 264         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 265         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 266         case ATOMIC_TYPE_CHAR:        return "char";
 267         case ATOMIC_TYPE_SCHAR:       return "signed char";
 268         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 269         case ATOMIC_TYPE_INT:         return "int";
 270         case ATOMIC_TYPE_UINT:        return "unsigned int";
 271         case ATOMIC_TYPE_SHORT:       return "short";
 272         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 273         case ATOMIC_TYPE_LONG:        return "long";
 274         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 275         case ATOMIC_TYPE_LONGLONG:    return "long long";
 276         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 277         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 278         case ATOMIC_TYPE_FLOAT:       return "float";
 279         case ATOMIC_TYPE_DOUBLE:      return "double";
 280         }
 281         return "INVALIDATOMIC";
 282 }
 283
 284 /**
 285  * Prints the name of an atomic type kinds.
 286  *
 287  * @param kind  The type kind.
 288  */
 289 static void print_atomic_kinds(atomic_type_kind_t kind)
 290 {
 291         const char *s = get_atomic_kind_name(kind);
 292         print_string(s);
 293 }
 294
 295 /**
 296  * Prints the name of an atomic type.
 297  *
 298  * @param type  The type.
 299  */
 300 static void print_atomic_type(const atomic_type_t *type)
 301 {
 302         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 303         print_atomic_kinds(type->akind);
 304 }
 305
 306 /**
 307  * Prints the name of a complex type.
 308  *
 309  * @param type  The type.
 310  */
 311 static void print_complex_type(const atomic_type_t *type)
 312 {
 313         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 314         print_string("_Complex");
 315         print_atomic_kinds(type->akind);
 316 }
 317
 318 /**
 319  * Prints the name of an imaginary type.
 320  *
 321  * @param type  The type.
 322  */
 323 static void print_imaginary_type(const atomic_type_t *type)
 324 {
 325         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 326         print_string("_Imaginary ");
 327         print_atomic_kinds(type->akind);
 328 }
 329
 330 /**
 331  * Print the first part (the prefix) of a type.
 332  *
 333  * @param type   The type to print.
 334  */
 335 static void print_function_type_pre(const function_type_t *type)
 336 {
 337         switch (type->linkage) {
 338                 case LINKAGE_C:
 339                         if (c_mode & _CXX)
 340                                 print_string("extern \"C\" ");
 341                         break;
 342
 343                 case LINKAGE_CXX:
 344                         if (!(c_mode & _CXX))
 345                                 print_string("extern \"C++\" ");
 346                         break;
 347         }
 348
 349         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 350
 351         intern_print_type_pre(type->return_type);
 352
 353         cc_kind_t cc = type->calling_convention;
 354 restart:
 355         switch (cc) {
 356         case CC_CDECL:    print_string(" __cdecl");    break;
 357         case CC_STDCALL:  print_string(" __stdcall");  break;
 358         case CC_FASTCALL: print_string(" __fastcall"); break;
 359         case CC_THISCALL: print_string(" __thiscall"); break;
 360         case CC_DEFAULT:
 361                 if (default_calling_convention != CC_CDECL) {
 362                         /* show the default calling convention if its not cdecl */
 363                         cc = default_calling_convention;
 364                         goto restart;
 365                 }
 366                 break;
 367         }
 368 }
 369
 370 /**
 371  * Print the second part (the postfix) of a type.
 372  *
 373  * @param type   The type to print.
 374  */
 375 static void print_function_type_post(const function_type_t *type,
 376                                      const scope_t *parameters)
 377 {
 378         print_char('(');
 379         separator_t sep = { "", ", " };
 380         if (parameters == NULL) {
 381                 function_parameter_t *parameter = type->parameters;
 382                 for( ; parameter != NULL; parameter = parameter->next) {
 383                         print_string(sep_next(&sep));
 384                         print_type(parameter->type);
 385                 }
 386         } else {
 387                 entity_t *parameter = parameters->entities;
 388                 for (; parameter != NULL; parameter = parameter->base.next) {
 389                         if (parameter->kind != ENTITY_PARAMETER)
 390                                 continue;
 391
 392                         print_string(sep_next(&sep));
 393                         const type_t *const param_type = parameter->declaration.type;
 394                         if (param_type == NULL) {
 395                                 print_string(parameter->base.symbol->string);
 396                         } else {
 397                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 398                         }
 399                 }
 400         }
 401         if (type->variadic) {
 402                 print_string(sep_next(&sep));
 403                 print_string("...");
 404         }
 405         if (sep_at_first(&sep) && !type->unspecified_parameters) {
 406                 print_string("void");
 407         }
 408         print_char(')');
 409
 410         intern_print_type_post(type->return_type);
 411 }
 412
 413 /**
 414  * Prints the prefix part of a pointer type.
 415  *
 416  * @param type   The pointer type.
 417  */
 418 static void print_pointer_type_pre(const pointer_type_t *type)
 419 {
 420         type_t const *const points_to = type->points_to;
 421         intern_print_type_pre(points_to);
 422         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 423                 print_string(" (");
 424         variable_t *const variable = type->base_variable;
 425         if (variable != NULL) {
 426                 print_string(" __based(");
 427                 print_string(variable->base.base.symbol->string);
 428                 print_string(") ");
 429         }
 430         print_char('*');
 431         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 432 }
 433
 434 /**
 435  * Prints the postfix part of a pointer type.
 436  *
 437  * @param type   The pointer type.
 438  */
 439 static void print_pointer_type_post(const pointer_type_t *type)
 440 {
 441         type_t const *const points_to = type->points_to;
 442         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 443                 print_char(')');
 444         intern_print_type_post(points_to);
 445 }
 446
 447 /**
 448  * Prints the prefix part of a reference type.
 449  *
 450  * @param type   The reference type.
 451  */
 452 static void print_reference_type_pre(const reference_type_t *type)
 453 {
 454         type_t const *const refers_to = type->refers_to;
 455         intern_print_type_pre(refers_to);
 456         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 457                 print_string(" (");
 458         print_char('&');
 459 }
 460
 461 /**
 462  * Prints the postfix part of a reference type.
 463  *
 464  * @param type   The reference type.
 465  */
 466 static void print_reference_type_post(const reference_type_t *type)
 467 {
 468         type_t const *const refers_to = type->refers_to;
 469         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 470                 print_char(')');
 471         intern_print_type_post(refers_to);
 472 }
 473
 474 /**
 475  * Prints the prefix part of an array type.
 476  *
 477  * @param type   The array type.
 478  */
 479 static void print_array_type_pre(const array_type_t *type)
 480 {
 481         intern_print_type_pre(type->element_type);
 482 }
 483
 484 /**
 485  * Prints the postfix part of an array type.
 486  *
 487  * @param type   The array type.
 488  */
 489 static void print_array_type_post(const array_type_t *type)
 490 {
 491         print_char('[');
 492         if (type->is_static) {
 493                 print_string("static ");
 494         }
 495         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 496         if (type->size_expression != NULL
 497                         && (print_implicit_array_size || !type->has_implicit_size)) {
 498                 print_expression(type->size_expression);
 499         }
 500         print_char(']');
 501         intern_print_type_post(type->element_type);
 502 }
 503
 504 void print_enum_definition(const enum_t *enume)
 505 {
 506         print_string("{\n");
 507
 508         change_indent(1);
 509
 510         entity_t *entry = enume->base.next;
 511         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 512                entry = entry->base.next) {
 513
 514                 print_indent();
 515                 print_string(entry->base.symbol->string);
 516                 if (entry->enum_value.value != NULL) {
 517                         print_string(" = ");
 518                         print_expression(entry->enum_value.value);
 519                 }
 520                 print_string(",\n");
 521         }
 522
 523         change_indent(-1);
 524         print_indent();
 525         print_char('}');
 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.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 void print_compound_definition(const compound_t *compound)
 548 {
 549         print_string("{\n");
 550         change_indent(1);
 551
 552         entity_t *entity = compound->members.entities;
 553         for( ; entity != NULL; entity = entity->base.next) {
 554                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 555                         continue;
 556
 557                 print_indent();
 558                 print_entity(entity);
 559                 print_char('\n');
 560         }
 561
 562         change_indent(-1);
 563         print_indent();
 564         print_char('}');
 565         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 566                 print_string("__attribute__((__transparent_union__))");
 567         }
 568 }
 569
 570 /**
 571  * Prints a compound type.
 572  *
 573  * @param kind  The name of the compound kind.
 574  * @param type  The compound type.
 575  */
 576 static void print_compound_type(char const *const kind, compound_type_t const *const type)
 577 {
 578         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 579         print_string(kind);
 580
 581         compound_t *compound = type->compound;
 582         symbol_t   *symbol   = compound->base.symbol;
 583         if (symbol != NULL) {
 584                 print_string(symbol->string);
 585         } else {
 586                 print_compound_definition(compound);
 587         }
 588 }
 589
 590 /**
 591  * Prints the prefix part of a typedef type.
 592  *
 593  * @param type   The typedef type.
 594  */
 595 static void print_typedef_type_pre(const typedef_type_t *const type)
 596 {
 597         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 598         print_string(type->typedefe->base.symbol->string);
 599 }
 600
 601 /**
 602  * Prints the prefix part of a typeof type.
 603  *
 604  * @param type   The typeof type.
 605  */
 606 static void print_typeof_type_pre(const typeof_type_t *const type)
 607 {
 608         print_string("typeof(");
 609         if (type->expression != NULL) {
 610                 print_expression(type->expression);
 611         } else {
 612                 print_type(type->typeof_type);
 613         }
 614         print_char(')');
 615 }
 616
 617 /**
 618  * Prints the prefix part of a type.
 619  *
 620  * @param type   The type.
 621  */
 622 static void intern_print_type_pre(const type_t *const type)
 623 {
 624         switch(type->kind) {
 625         case TYPE_ARRAY:           print_array_type_pre(          &type->array);     return;
 626         case TYPE_ATOMIC:          print_atomic_type(             &type->atomic);    return;
 627         case TYPE_COMPLEX:         print_complex_type(            &type->atomic);    return;
 628         case TYPE_COMPOUND_STRUCT: print_compound_type("struct ", &type->compound);  return;
 629         case TYPE_COMPOUND_UNION:  print_compound_type("union ",  &type->compound);  return;
 630         case TYPE_ENUM:            print_type_enum(               &type->enumt);     return;
 631         case TYPE_ERROR:           print_string("<error>");                          return;
 632         case TYPE_FUNCTION:        print_function_type_pre(       &type->function);  return;
 633         case TYPE_IMAGINARY:       print_imaginary_type(          &type->atomic);    return;
 634         case TYPE_POINTER:         print_pointer_type_pre(        &type->pointer);   return;
 635         case TYPE_REFERENCE:       print_reference_type_pre(      &type->reference); return;
 636         case TYPE_TYPEDEF:         print_typedef_type_pre(        &type->typedeft);  return;
 637         case TYPE_TYPEOF:          print_typeof_type_pre(         &type->typeoft);   return;
 638         }
 639         print_string("unknown");
 640 }
 641
 642 /**
 643  * Prints the postfix part of a type.
 644  *
 645  * @param type   The type.
 646  */
 647 static void intern_print_type_post(const type_t *const type)
 648 {
 649         switch(type->kind) {
 650         case TYPE_FUNCTION:
 651                 print_function_type_post(&type->function, NULL);
 652                 return;
 653         case TYPE_POINTER:
 654                 print_pointer_type_post(&type->pointer);
 655                 return;
 656         case TYPE_REFERENCE:
 657                 print_reference_type_post(&type->reference);
 658                 return;
 659         case TYPE_ARRAY:
 660                 print_array_type_post(&type->array);
 661                 return;
 662         case TYPE_ERROR:
 663         case TYPE_ATOMIC:
 664         case TYPE_COMPLEX:
 665         case TYPE_IMAGINARY:
 666         case TYPE_ENUM:
 667         case TYPE_COMPOUND_STRUCT:
 668         case TYPE_COMPOUND_UNION:
 669         case TYPE_TYPEOF:
 670         case TYPE_TYPEDEF:
 671                 break;
 672         }
 673 }
 674
 675 void print_type(const type_t *const type)
 676 {
 677         print_type_ext(type, NULL, NULL);
 678 }
 679
 680 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 681                     const scope_t *parameters)
 682 {
 683         intern_print_type_pre(type);
 684         if (symbol != NULL) {
 685                 print_char(' ');
 686                 print_string(symbol->string);
 687         }
 688         if (type->kind == TYPE_FUNCTION) {
 689                 print_function_type_post(&type->function, parameters);
 690         } else {
 691                 intern_print_type_post(type);
 692         }
 693 }
 694
 695 type_t *duplicate_type(const type_t *type)
 696 {
 697         size_t size = get_type_struct_size(type->kind);
 698
 699         type_t *const copy = obstack_copy(&type_obst, type, size);
 700         copy->base.firm_type = NULL;
 701
 702         return copy;
 703 }
 704
 705 type_t *get_unqualified_type(type_t *type)
 706 {
 707         assert(!is_typeref(type));
 708
 709         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 710                 return type;
 711
 712         type_t *unqualified_type          = duplicate_type(type);
 713         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 714
 715         return identify_new_type(unqualified_type);
 716 }
 717
 718 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 719 {
 720         type_t *type = skip_typeref(orig_type);
 721
 722         type_t *copy;
 723         if (is_type_array(type)) {
 724                 /* For array types the element type has to be adjusted */
 725                 type_t *element_type      = type->array.element_type;
 726                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 727
 728                 if (qual_element_type == element_type)
 729                         return orig_type;
 730
 731                 copy                     = duplicate_type(type);
 732                 copy->array.element_type = qual_element_type;
 733         } else if (is_type_valid(type)) {
 734                 if ((type->base.qualifiers & qual) == (int)qual)
 735                         return orig_type;
 736
 737                 copy                   = duplicate_type(type);
 738                 copy->base.qualifiers |= qual;
 739         } else {
 740                 return type;
 741         }
 742
 743         return identify_new_type(copy);
 744 }
 745
 746 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 747                                   atomic_type_flag_t flag)
 748 {
 749         assert(kind <= ATOMIC_TYPE_LAST);
 750         return (atomic_type_properties[kind].flags & flag) != 0;
 751 }
 752
 753 bool is_type_integer(const type_t *type)
 754 {
 755         assert(!is_typeref(type));
 756
 757         if (type->kind == TYPE_ENUM)
 758                 return true;
 759         if (type->kind != TYPE_ATOMIC)
 760                 return false;
 761
 762         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 763 }
 764
 765 bool is_type_enum(const type_t *type)
 766 {
 767         assert(!is_typeref(type));
 768         return type->kind == TYPE_ENUM;
 769 }
 770
 771 bool is_type_float(const type_t *type)
 772 {
 773         assert(!is_typeref(type));
 774
 775         if (type->kind != TYPE_ATOMIC)
 776                 return false;
 777
 778         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 779 }
 780
 781 bool is_type_signed(const type_t *type)
 782 {
 783         assert(!is_typeref(type));
 784
 785         /* enum types are int for now */
 786         if (type->kind == TYPE_ENUM)
 787                 return true;
 788         if (type->kind != TYPE_ATOMIC)
 789                 return false;
 790
 791         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 792 }
 793
 794 bool is_type_arithmetic(const type_t *type)
 795 {
 796         assert(!is_typeref(type));
 797
 798         switch(type->kind) {
 799         case TYPE_ENUM:
 800                 return true;
 801         case TYPE_ATOMIC:
 802         case TYPE_COMPLEX:
 803         case TYPE_IMAGINARY:
 804                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 805         default:
 806                 return false;
 807         }
 808 }
 809
 810 bool is_type_real(const type_t *type)
 811 {
 812         /* 6.2.5 (17) */
 813         return is_type_integer(type) || is_type_float(type);
 814 }
 815
 816 bool is_type_scalar(const type_t *type)
 817 {
 818         assert(!is_typeref(type));
 819
 820         switch(type->kind) {
 821         case TYPE_POINTER:
 822         case TYPE_ENUM:
 823                 return true;
 824         case TYPE_ATOMIC:
 825         case TYPE_IMAGINARY:
 826                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 827         default:
 828                 return false;
 829         }
 830 }
 831
 832 bool is_type_incomplete(const type_t *type)
 833 {
 834         assert(!is_typeref(type));
 835
 836         switch(type->kind) {
 837         case TYPE_COMPOUND_STRUCT:
 838         case TYPE_COMPOUND_UNION: {
 839                 const compound_type_t *compound_type = &type->compound;
 840                 return !compound_type->compound->complete;
 841         }
 842         case TYPE_ENUM:
 843                 return false;
 844
 845         case TYPE_ARRAY:
 846                 return type->array.size_expression == NULL
 847                         && !type->array.size_constant;
 848
 849         case TYPE_ATOMIC:
 850         case TYPE_IMAGINARY:
 851         case TYPE_COMPLEX:
 852                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 853
 854         case TYPE_FUNCTION:
 855         case TYPE_POINTER:
 856         case TYPE_REFERENCE:
 857         case TYPE_ERROR:
 858                 return false;
 859
 860         case TYPE_TYPEDEF:
 861         case TYPE_TYPEOF:
 862                 panic("typedef not skipped");
 863         }
 864
 865         panic("invalid type");
 866 }
 867
 868 bool is_type_object(const type_t *type)
 869 {
 870         return !is_type_function(type) && !is_type_incomplete(type);
 871 }
 872
 873 /**
 874  * Check if two function types are compatible.
 875  */
 876 static bool function_types_compatible(const function_type_t *func1,
 877                                       const function_type_t *func2)
 878 {
 879         const type_t* const ret1 = skip_typeref(func1->return_type);
 880         const type_t* const ret2 = skip_typeref(func2->return_type);
 881         if (!types_compatible(ret1, ret2))
 882                 return false;
 883
 884         if (func1->linkage != func2->linkage)
 885                 return false;
 886
 887         cc_kind_t cc1 = func1->calling_convention;
 888         if (cc1 == CC_DEFAULT)
 889                 cc1 = default_calling_convention;
 890         cc_kind_t cc2 = func2->calling_convention;
 891         if (cc2 == CC_DEFAULT)
 892                 cc2 = default_calling_convention;
 893
 894         if (cc1 != cc2)
 895                 return false;
 896
 897         if (func1->variadic != func2->variadic)
 898                 return false;
 899
 900         /* can parameters be compared? */
 901         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
 902                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
 903                 return true;
 904
 905         /* TODO: handling of unspecified parameters not correct yet */
 906
 907         /* all argument types must be compatible */
 908         function_parameter_t *parameter1 = func1->parameters;
 909         function_parameter_t *parameter2 = func2->parameters;
 910         for ( ; parameter1 != NULL && parameter2 != NULL;
 911                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 912                 type_t *parameter1_type = skip_typeref(parameter1->type);
 913                 type_t *parameter2_type = skip_typeref(parameter2->type);
 914
 915                 parameter1_type = get_unqualified_type(parameter1_type);
 916                 parameter2_type = get_unqualified_type(parameter2_type);
 917
 918                 if (!types_compatible(parameter1_type, parameter2_type))
 919                         return false;
 920         }
 921         /* same number of arguments? */
 922         if (parameter1 != NULL || parameter2 != NULL)
 923                 return false;
 924
 925         return true;
 926 }
 927
 928 /**
 929  * Check if two array types are compatible.
 930  */
 931 static bool array_types_compatible(const array_type_t *array1,
 932                                    const array_type_t *array2)
 933 {
 934         type_t *element_type1 = skip_typeref(array1->element_type);
 935         type_t *element_type2 = skip_typeref(array2->element_type);
 936         if (!types_compatible(element_type1, element_type2))
 937                 return false;
 938
 939         if (!array1->size_constant || !array2->size_constant)
 940                 return true;
 941
 942         return array1->size == array2->size;
 943 }
 944
 945 bool types_compatible(const type_t *type1, const type_t *type2)
 946 {
 947         assert(!is_typeref(type1));
 948         assert(!is_typeref(type2));
 949
 950         /* shortcut: the same type is always compatible */
 951         if (type1 == type2)
 952                 return true;
 953
 954         if (type1->base.qualifiers == type2->base.qualifiers &&
 955             type1->kind            == type2->kind) {
 956                 switch (type1->kind) {
 957                 case TYPE_FUNCTION:
 958                         return function_types_compatible(&type1->function, &type2->function);
 959                 case TYPE_ATOMIC:
 960                 case TYPE_IMAGINARY:
 961                 case TYPE_COMPLEX:
 962                         return type1->atomic.akind == type2->atomic.akind;
 963                 case TYPE_ARRAY:
 964                         return array_types_compatible(&type1->array, &type2->array);
 965
 966                 case TYPE_POINTER: {
 967                         const type_t *const to1 = skip_typeref(type1->pointer.points_to);
 968                         const type_t *const to2 = skip_typeref(type2->pointer.points_to);
 969                         return types_compatible(to1, to2);
 970                 }
 971
 972                 case TYPE_REFERENCE: {
 973                         const type_t *const to1 = skip_typeref(type1->reference.refers_to);
 974                         const type_t *const to2 = skip_typeref(type2->reference.refers_to);
 975                         return types_compatible(to1, to2);
 976                 }
 977
 978                 case TYPE_COMPOUND_STRUCT:
 979                 case TYPE_COMPOUND_UNION:
 980                         break;
 981
 982                 case TYPE_ENUM:
 983                         /* TODO: not implemented */
 984                         break;
 985
 986                 case TYPE_ERROR:
 987                         /* Hmm, the error type should be compatible to all other types */
 988                         return true;
 989                 case TYPE_TYPEDEF:
 990                 case TYPE_TYPEOF:
 991                         panic("typeref not skipped");
 992                 }
 993         }
 994
 995         return !is_type_valid(type1) || !is_type_valid(type2);
 996 }
 997
 998 /**
 999  * Skip all typerefs and return the underlying type.
1000  */
1001 type_t *skip_typeref(type_t *type)
1002 {
1003         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1004
1005         while (true) {
1006                 switch (type->kind) {
1007                 case TYPE_ERROR:
1008                         return type;
1009                 case TYPE_TYPEDEF: {
1010                         qualifiers |= type->base.qualifiers;
1011
1012                         const typedef_type_t *typedef_type = &type->typedeft;
1013                         if (typedef_type->resolved_type != NULL) {
1014                                 type = typedef_type->resolved_type;
1015                                 break;
1016                         }
1017                         type = typedef_type->typedefe->type;
1018                         continue;
1019                 }
1020                 case TYPE_TYPEOF:
1021                         qualifiers |= type->base.qualifiers;
1022                         type        = type->typeoft.typeof_type;
1023                         continue;
1024                 default:
1025                         break;
1026                 }
1027                 break;
1028         }
1029
1030         if (qualifiers != TYPE_QUALIFIER_NONE) {
1031                 type_t *const copy = duplicate_type(type);
1032
1033                 /* for const with typedefed array type the element type has to be
1034                  * adjusted */
1035                 if (is_type_array(copy)) {
1036                         type_t *element_type           = copy->array.element_type;
1037                         element_type                   = duplicate_type(element_type);
1038                         element_type->base.qualifiers |= qualifiers;
1039                         copy->array.element_type       = element_type;
1040                 } else {
1041                         copy->base.qualifiers |= qualifiers;
1042                 }
1043
1044                 type = identify_new_type(copy);
1045         }
1046
1047         return type;
1048 }
1049
1050 unsigned get_type_size(type_t *type)
1051 {
1052         switch (type->kind) {
1053         case TYPE_ERROR:
1054                 return 0;
1055         case TYPE_ATOMIC:
1056         case TYPE_IMAGINARY:
1057         case TYPE_ENUM:
1058                 return get_atomic_type_size(type->atomic.akind);
1059         case TYPE_COMPLEX:
1060                 return get_atomic_type_size(type->atomic.akind) * 2;
1061         case TYPE_COMPOUND_UNION:
1062                 layout_union_type(&type->compound);
1063                 return type->compound.compound->size;
1064         case TYPE_COMPOUND_STRUCT:
1065                 layout_struct_type(&type->compound);
1066                 return type->compound.compound->size;
1067         case TYPE_FUNCTION:
1068                 return 1; /* strange GNU extensions: sizeof(function) == 1 */
1069         case TYPE_REFERENCE:
1070         case TYPE_POINTER:
1071                 return pointer_properties.size;
1072         case TYPE_ARRAY: {
1073                 /* TODO: correct if element_type is aligned? */
1074                 il_size_t element_size = get_type_size(type->array.element_type);
1075                 return type->array.size * element_size;
1076         }
1077         case TYPE_TYPEDEF:
1078                 return get_type_size(type->typedeft.typedefe->type);
1079         case TYPE_TYPEOF:
1080                 return get_type_size(type->typeoft.typeof_type);
1081         }
1082         panic("invalid type");
1083 }
1084
1085 unsigned get_type_alignment(type_t *type)
1086 {
1087         switch (type->kind) {
1088         case TYPE_ERROR:
1089                 return 0;
1090         case TYPE_ATOMIC:
1091         case TYPE_IMAGINARY:
1092         case TYPE_COMPLEX:
1093         case TYPE_ENUM:
1094                 return get_atomic_type_alignment(type->atomic.akind);
1095         case TYPE_COMPOUND_UNION:
1096                 layout_union_type(&type->compound);
1097                 return type->compound.compound->alignment;
1098         case TYPE_COMPOUND_STRUCT:
1099                 layout_struct_type(&type->compound);
1100                 return type->compound.compound->alignment;
1101         case TYPE_FUNCTION:
1102                 /* gcc says 1 here... */
1103                 return 1;
1104         case TYPE_REFERENCE:
1105         case TYPE_POINTER:
1106                 return pointer_properties.alignment;
1107         case TYPE_ARRAY:
1108                 return get_type_alignment(type->array.element_type);
1109         case TYPE_TYPEDEF: {
1110                 il_alignment_t alignment
1111                         = get_type_alignment(type->typedeft.typedefe->type);
1112                 if (type->typedeft.typedefe->alignment > alignment)
1113                         alignment = type->typedeft.typedefe->alignment;
1114
1115                 return alignment;
1116         }
1117         case TYPE_TYPEOF:
1118                 return get_type_alignment(type->typeoft.typeof_type);
1119         }
1120         panic("invalid type");
1121 }
1122
1123 /**
1124  * get alignment of a type when used inside a compound.
1125  * Some ABIs are broken and alignment inside a compound is different from
1126  * recommended alignment of a type
1127  */
1128 static unsigned get_type_alignment_compound(type_t *const type)
1129 {
1130         assert(!is_typeref(type));
1131         if (type->kind == TYPE_ATOMIC)
1132                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1133         return get_type_alignment(type);
1134 }
1135
1136 decl_modifiers_t get_type_modifiers(const type_t *type)
1137 {
1138         switch(type->kind) {
1139         case TYPE_ERROR:
1140                 break;
1141         case TYPE_COMPOUND_STRUCT:
1142         case TYPE_COMPOUND_UNION:
1143                 return type->compound.compound->modifiers;
1144         case TYPE_FUNCTION:
1145                 return type->function.modifiers;
1146         case TYPE_ENUM:
1147         case TYPE_ATOMIC:
1148         case TYPE_COMPLEX:
1149         case TYPE_IMAGINARY:
1150         case TYPE_REFERENCE:
1151         case TYPE_POINTER:
1152         case TYPE_ARRAY:
1153                 return 0;
1154         case TYPE_TYPEDEF: {
1155                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1156                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1157                 return modifiers;
1158         }
1159         case TYPE_TYPEOF:
1160                 return get_type_modifiers(type->typeoft.typeof_type);
1161         }
1162         panic("invalid type");
1163 }
1164
1165 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1166 {
1167         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1168
1169         while (true) {
1170                 switch (type->base.kind) {
1171                 case TYPE_ERROR:
1172                         return TYPE_QUALIFIER_NONE;
1173                 case TYPE_TYPEDEF:
1174                         qualifiers |= type->base.qualifiers;
1175                         const typedef_type_t *typedef_type = &type->typedeft;
1176                         if (typedef_type->resolved_type != NULL)
1177                                 type = typedef_type->resolved_type;
1178                         else
1179                                 type = typedef_type->typedefe->type;
1180                         continue;
1181                 case TYPE_TYPEOF:
1182                         type = type->typeoft.typeof_type;
1183                         continue;
1184                 case TYPE_ARRAY:
1185                         if (skip_array_type) {
1186                                 type = type->array.element_type;
1187                                 continue;
1188                         }
1189                         break;
1190                 default:
1191                         break;
1192                 }
1193                 break;
1194         }
1195         return type->base.qualifiers | qualifiers;
1196 }
1197
1198 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1199 {
1200         assert(kind <= ATOMIC_TYPE_LAST);
1201         return atomic_type_properties[kind].size;
1202 }
1203
1204 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1205 {
1206         assert(kind <= ATOMIC_TYPE_LAST);
1207         return atomic_type_properties[kind].alignment;
1208 }
1209
1210 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1211 {
1212         assert(kind <= ATOMIC_TYPE_LAST);
1213         return atomic_type_properties[kind].flags;
1214 }
1215
1216 /**
1217  * Find the atomic type kind representing a given size (signed).
1218  */
1219 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1220 {
1221         static atomic_type_kind_t kinds[32];
1222
1223         assert(size < 32);
1224         atomic_type_kind_t kind = kinds[size];
1225         if (kind == (atomic_type_kind_t)0) {
1226                 static const atomic_type_kind_t possible_kinds[] = {
1227                         ATOMIC_TYPE_SCHAR,
1228                         ATOMIC_TYPE_SHORT,
1229                         ATOMIC_TYPE_INT,
1230                         ATOMIC_TYPE_LONG,
1231                         ATOMIC_TYPE_LONGLONG
1232                 };
1233                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1234                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1235                                 kind = possible_kinds[i];
1236                                 break;
1237                         }
1238                 }
1239                 kinds[size] = kind;
1240         }
1241         return kind;
1242 }
1243
1244 /**
1245  * Find the atomic type kind representing a given size (signed).
1246  */
1247 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1248 {
1249         static atomic_type_kind_t kinds[32];
1250
1251         assert(size < 32);
1252         atomic_type_kind_t kind = kinds[size];
1253         if (kind == (atomic_type_kind_t)0) {
1254                 static const atomic_type_kind_t possible_kinds[] = {
1255                         ATOMIC_TYPE_UCHAR,
1256                         ATOMIC_TYPE_USHORT,
1257                         ATOMIC_TYPE_UINT,
1258                         ATOMIC_TYPE_ULONG,
1259                         ATOMIC_TYPE_ULONGLONG
1260                 };
1261                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1262                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1263                                 kind = possible_kinds[i];
1264                                 break;
1265                         }
1266                 }
1267                 kinds[size] = kind;
1268         }
1269         return kind;
1270 }
1271
1272 /**
1273  * Hash the given type and return the "singleton" version
1274  * of it.
1275  */
1276 type_t *identify_new_type(type_t *type)
1277 {
1278         type_t *result = typehash_insert(type);
1279         if (result != type) {
1280                 obstack_free(&type_obst, type);
1281         }
1282         return result;
1283 }
1284
1285 /**
1286  * Creates a new atomic type.
1287  *
1288  * @param akind       The kind of the atomic type.
1289  * @param qualifiers  Type qualifiers for the new type.
1290  */
1291 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1292 {
1293         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1294         type->base.qualifiers = qualifiers;
1295         type->atomic.akind    = akind;
1296
1297         return identify_new_type(type);
1298 }
1299
1300 /**
1301  * Creates a new complex type.
1302  *
1303  * @param akind       The kind of the atomic type.
1304  * @param qualifiers  Type qualifiers for the new type.
1305  */
1306 type_t *make_complex_type(atomic_type_kind_t akind,
1307                           type_qualifiers_t qualifiers)
1308 {
1309         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1310         type->base.qualifiers = qualifiers;
1311         type->atomic.akind   = akind;
1312
1313         return identify_new_type(type);
1314 }
1315
1316 /**
1317  * Creates a new imaginary type.
1318  *
1319  * @param akind       The kind of the atomic type.
1320  * @param qualifiers  Type qualifiers for the new type.
1321  */
1322 type_t *make_imaginary_type(atomic_type_kind_t akind,
1323                             type_qualifiers_t qualifiers)
1324 {
1325         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1326         type->base.qualifiers = qualifiers;
1327         type->atomic.akind = akind;
1328
1329         return identify_new_type(type);
1330 }
1331
1332 /**
1333  * Creates a new pointer type.
1334  *
1335  * @param points_to   The points-to type for the new type.
1336  * @param qualifiers  Type qualifiers for the new type.
1337  */
1338 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1339 {
1340         type_t *const type = allocate_type_zero(TYPE_POINTER);
1341         type->base.qualifiers       = qualifiers;
1342         type->pointer.points_to     = points_to;
1343         type->pointer.base_variable = NULL;
1344
1345         return identify_new_type(type);
1346 }
1347
1348 /**
1349  * Creates a new reference type.
1350  *
1351  * @param refers_to   The referred-to type for the new type.
1352  */
1353 type_t *make_reference_type(type_t *refers_to)
1354 {
1355         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1356         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1357         type->reference.refers_to = refers_to;
1358
1359         return identify_new_type(type);
1360 }
1361
1362 /**
1363  * Creates a new based pointer type.
1364  *
1365  * @param points_to   The points-to type for the new type.
1366  * @param qualifiers  Type qualifiers for the new type.
1367  * @param variable    The based variable
1368  */
1369 type_t *make_based_pointer_type(type_t *points_to,
1370                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1371 {
1372         type_t *const type = allocate_type_zero(TYPE_POINTER);
1373         type->base.qualifiers       = qualifiers;
1374         type->pointer.points_to     = points_to;
1375         type->pointer.base_variable = variable;
1376
1377         return identify_new_type(type);
1378 }
1379
1380
1381 type_t *make_array_type(type_t *element_type, size_t size,
1382                         type_qualifiers_t qualifiers)
1383 {
1384         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1385         type->base.qualifiers     = qualifiers;
1386         type->array.element_type  = element_type;
1387         type->array.size          = size;
1388         type->array.size_constant = true;
1389
1390         return identify_new_type(type);
1391 }
1392
1393 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1394                                        il_alignment_t *struct_alignment,
1395                                                                            bool packed, entity_t *first)
1396 {
1397         il_size_t      offset     = *struct_offset;
1398         il_alignment_t alignment  = *struct_alignment;
1399         size_t         bit_offset = 0;
1400
1401         entity_t *member;
1402         for (member = first; member != NULL; member = member->base.next) {
1403                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1404                         continue;
1405                 if (!member->compound_member.bitfield)
1406                         break;
1407
1408                 type_t *const base_type = skip_typeref(member->declaration.type);
1409                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1410                 il_alignment_t alignment_mask = base_alignment-1;
1411                 if (base_alignment > alignment)
1412                         alignment = base_alignment;
1413
1414                 size_t bit_size = member->compound_member.bit_size;
1415                 if (!packed) {
1416                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1417                         offset     &= ~alignment_mask;
1418                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1419
1420                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1421                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1422                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1423                                 bit_offset = 0;
1424                         }
1425                 }
1426
1427                 if (byte_order_big_endian) {
1428                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1429                         member->compound_member.offset     = offset & ~alignment_mask;
1430                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1431                 } else {
1432                         member->compound_member.offset     = offset;
1433                         member->compound_member.bit_offset = bit_offset;
1434                 }
1435
1436                 bit_offset += bit_size;
1437                 offset     += bit_offset / BITS_PER_BYTE;
1438                 bit_offset %= BITS_PER_BYTE;
1439         }
1440
1441         if (bit_offset > 0)
1442                 offset += 1;
1443
1444         *struct_offset    = offset;
1445         *struct_alignment = alignment;
1446         return member;
1447 }
1448
1449 void layout_struct_type(compound_type_t *type)
1450 {
1451         assert(type->compound != NULL);
1452
1453         compound_t *compound = type->compound;
1454         if (!compound->complete)
1455                 return;
1456         if (type->compound->layouted)
1457                 return;
1458         compound->layouted = true;
1459
1460         il_size_t      offset    = 0;
1461         il_alignment_t alignment = compound->alignment;
1462         bool           need_pad  = false;
1463
1464         entity_t *entry = compound->members.entities;
1465         while (entry != NULL) {
1466                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1467                         goto next;
1468
1469                 type_t *const m_type = skip_typeref(entry->declaration.type);
1470                 if (!is_type_valid(m_type))
1471                         goto next;
1472
1473                 if (entry->compound_member.bitfield) {
1474                         entry = pack_bitfield_members(&offset, &alignment,
1475                                                       compound->packed, entry);
1476                         continue;
1477                 }
1478
1479                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1480                 if (m_alignment > alignment)
1481                         alignment = m_alignment;
1482
1483                 if (!compound->packed) {
1484                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1485
1486                         if (new_offset > offset) {
1487                                 need_pad = true;
1488                                 offset   = new_offset;
1489                         }
1490                 }
1491
1492                 entry->compound_member.offset = offset;
1493                 offset += get_type_size(m_type);
1494
1495 next:
1496                 entry = entry->base.next;
1497         }
1498
1499         if (!compound->packed) {
1500                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1501                 if (new_offset > offset) {
1502                         need_pad = true;
1503                         offset   = new_offset;
1504                 }
1505         }
1506
1507         position_t const *const pos = &compound->base.pos;
1508         if (need_pad) {
1509                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1510         } else if (compound->packed) {
1511                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1512         }
1513
1514         compound->size      = offset;
1515         compound->alignment = alignment;
1516 }
1517
1518 void layout_union_type(compound_type_t *type)
1519 {
1520         assert(type->compound != NULL);
1521
1522         compound_t *compound = type->compound;
1523         if (! compound->complete)
1524                 return;
1525         if (compound->layouted)
1526                 return;
1527         compound->layouted = true;
1528
1529         il_size_t      size      = 0;
1530         il_alignment_t alignment = compound->alignment;
1531
1532         entity_t *entry = compound->members.entities;
1533         for (; entry != NULL; entry = entry->base.next) {
1534                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1535                         continue;
1536
1537                 type_t *m_type = skip_typeref(entry->declaration.type);
1538                 if (! is_type_valid(skip_typeref(m_type)))
1539                         continue;
1540
1541                 entry->compound_member.offset = 0;
1542                 il_size_t m_size = get_type_size(m_type);
1543                 if (m_size > size)
1544                         size = m_size;
1545                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1546                 if (m_alignment > alignment)
1547                         alignment = m_alignment;
1548         }
1549         size = (size + alignment - 1) & -alignment;
1550
1551         compound->size      = size;
1552         compound->alignment = alignment;
1553 }
1554
1555 function_parameter_t *allocate_parameter(type_t *const type)
1556 {
1557         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1558         memset(param, 0, sizeof(*param));
1559         param->type = type;
1560         return param;
1561 }
1562
1563 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1564                              type_t *argument_type2, decl_modifiers_t modifiers)
1565 {
1566         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1567         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1568         parameter1->next = parameter2;
1569
1570         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1571         type->function.return_type = return_type;
1572         type->function.parameters  = parameter1;
1573         type->function.modifiers  |= modifiers;
1574         type->function.linkage     = LINKAGE_C;
1575
1576         return identify_new_type(type);
1577 }
1578
1579 type_t *make_function_1_type(type_t *return_type, type_t *argument_type,
1580                              decl_modifiers_t modifiers)
1581 {
1582         function_parameter_t *const parameter = allocate_parameter(argument_type);
1583
1584         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1585         type->function.return_type = return_type;
1586         type->function.parameters  = parameter;
1587         type->function.modifiers  |= modifiers;
1588         type->function.linkage     = LINKAGE_C;
1589
1590         return identify_new_type(type);
1591 }
1592
1593 type_t *make_function_1_type_variadic(type_t *return_type,
1594                                       type_t *argument_type,
1595                                       decl_modifiers_t modifiers)
1596 {
1597         function_parameter_t *const parameter = allocate_parameter(argument_type);
1598
1599         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1600         type->function.return_type = return_type;
1601         type->function.parameters  = parameter;
1602         type->function.variadic    = true;
1603         type->function.modifiers  |= modifiers;
1604         type->function.linkage     = LINKAGE_C;
1605
1606         return identify_new_type(type);
1607 }
1608
1609 type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers)
1610 {
1611         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1612         type->function.return_type = return_type;
1613         type->function.parameters  = NULL;
1614         type->function.modifiers  |= modifiers;
1615         type->function.linkage     = LINKAGE_C;
1616
1617         return identify_new_type(type);
1618 }
1619
1620 type_t *make_function_type(type_t *return_type, int n_types,
1621                            type_t *const *argument_types,
1622                                                    decl_modifiers_t modifiers)
1623 {
1624         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1625         type->function.return_type = return_type;
1626         type->function.modifiers  |= modifiers;
1627         type->function.linkage     = LINKAGE_C;
1628
1629         function_parameter_t **anchor = &type->function.parameters;
1630         for (int i = 0; i < n_types; ++i) {
1631                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1632                 *anchor = parameter;
1633                 anchor  = &parameter->next;
1634         }
1635
1636         return identify_new_type(type);
1637 }
1638
1639 /**
1640  * Debug helper. Prints the given type to stdout.
1641  */
1642 static __attribute__((unused))
1643 void dbg_type(const type_t *type)
1644 {
1645         print_to_file(stderr);
1646         print_type(type);
1647         print_char('\n');
1648         fflush(stderr);
1649 }