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 struct obstack         *type_obst                 = &_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 typedef struct atomic_type_properties_t atomic_type_properties_t;
  48 struct atomic_type_properties_t {
  49         unsigned   size;              /**< type size in bytes */
  50         unsigned   alignment;         /**< type alignment in bytes */
  51         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  52 };
  53
  54 /**
  55  * Returns the size of a type node.
  56  *
  57  * @param kind  the type kind
  58  */
  59 static size_t get_type_struct_size(type_kind_t kind)
  60 {
  61         static const size_t sizes[] = {
  62                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  63                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  64                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  65                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
  66                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  67                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  68                 [TYPE_ENUM]            = sizeof(enum_type_t),
  69                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  70                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  71                 [TYPE_ARRAY]           = sizeof(array_type_t),
  72                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  73                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  74         };
  75         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  76         assert(kind <= TYPE_TYPEOF);
  77         assert(sizes[kind] != 0);
  78         return sizes[kind];
  79 }
  80
  81 type_t *allocate_type_zero(type_kind_t kind)
  82 {
  83         size_t  size = get_type_struct_size(kind);
  84         type_t *res  = obstack_alloc(type_obst, size);
  85         memset(res, 0, size);
  86         res->base.kind = kind;
  87
  88         return res;
  89 }
  90
  91 /**
  92  * Properties of atomic types.
  93  */
  94 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  95         //ATOMIC_TYPE_INVALID = 0,
  96         [ATOMIC_TYPE_VOID] = {
  97                 .size       = 0,
  98                 .alignment  = 0,
  99                 .flags      = ATOMIC_TYPE_FLAG_NONE
 100         },
 101         [ATOMIC_TYPE_WCHAR_T] = {
 102                 .size       = (unsigned)-1,
 103                 .alignment  = (unsigned)-1,
 104                 /* signed flag will be set when known */
 105                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 106         },
 107         [ATOMIC_TYPE_CHAR] = {
 108                 .size       = 1,
 109                 .alignment  = 1,
 110                 /* signed flag will be set when known */
 111                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 112         },
 113         [ATOMIC_TYPE_SCHAR] = {
 114                 .size       = 1,
 115                 .alignment  = 1,
 116                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 117                               | ATOMIC_TYPE_FLAG_SIGNED,
 118         },
 119         [ATOMIC_TYPE_UCHAR] = {
 120                 .size       = 1,
 121                 .alignment  = 1,
 122                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 123         },
 124         [ATOMIC_TYPE_SHORT] = {
 125                 .size       = 2,
 126                 .alignment  = 2,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 128                               | ATOMIC_TYPE_FLAG_SIGNED
 129         },
 130         [ATOMIC_TYPE_USHORT] = {
 131                 .size       = 2,
 132                 .alignment  = 2,
 133                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 134         },
 135         [ATOMIC_TYPE_INT] = {
 136                 .size       = (unsigned) -1,
 137                 .alignment  = (unsigned) -1,
 138                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 139                               | ATOMIC_TYPE_FLAG_SIGNED,
 140         },
 141         [ATOMIC_TYPE_UINT] = {
 142                 .size       = (unsigned) -1,
 143                 .alignment  = (unsigned) -1,
 144                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 145         },
 146         [ATOMIC_TYPE_LONG] = {
 147                 .size       = (unsigned) -1,
 148                 .alignment  = (unsigned) -1,
 149                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 150                               | ATOMIC_TYPE_FLAG_SIGNED,
 151         },
 152         [ATOMIC_TYPE_ULONG] = {
 153                 .size       = (unsigned) -1,
 154                 .alignment  = (unsigned) -1,
 155                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 156         },
 157         [ATOMIC_TYPE_LONGLONG] = {
 158                 .size       = (unsigned) -1,
 159                 .alignment  = (unsigned) -1,
 160                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 161                               | ATOMIC_TYPE_FLAG_SIGNED,
 162         },
 163         [ATOMIC_TYPE_ULONGLONG] = {
 164                 .size       = (unsigned) -1,
 165                 .alignment  = (unsigned) -1,
 166                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 167         },
 168         [ATOMIC_TYPE_BOOL] = {
 169                 .size       = (unsigned) -1,
 170                 .alignment  = (unsigned) -1,
 171                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 172         },
 173         [ATOMIC_TYPE_FLOAT] = {
 174                 .size       = 4,
 175                 .alignment  = (unsigned) -1,
 176                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 177                               | ATOMIC_TYPE_FLAG_SIGNED,
 178         },
 179         [ATOMIC_TYPE_DOUBLE] = {
 180                 .size       = 8,
 181                 .alignment  = (unsigned) -1,
 182                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 183                               | ATOMIC_TYPE_FLAG_SIGNED,
 184         },
 185         [ATOMIC_TYPE_LONG_DOUBLE] = {
 186                 .size       = 12,
 187                 .alignment  = (unsigned) -1,
 188                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 189                               | ATOMIC_TYPE_FLAG_SIGNED,
 190         },
 191         /* complex and imaginary types are set in init_types */
 192 };
 193
 194 void init_types(void)
 195 {
 196         obstack_init(type_obst);
 197
 198         atomic_type_properties_t *props = atomic_type_properties;
 199
 200         if (char_is_signed) {
 201                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 202         }
 203
 204         unsigned int_size   = machine_size < 32 ? 2 : 4;
 205         /* long is always 32bit on windows */
 206         unsigned long_size  = c_mode & _MS ? 4 : (machine_size < 64 ? 4 : 8);
 207         unsigned llong_size = machine_size < 32 ? 4 : 8;
 208
 209         props[ATOMIC_TYPE_INT].size            = int_size;
 210         props[ATOMIC_TYPE_INT].alignment       = int_size;
 211         props[ATOMIC_TYPE_UINT].size           = int_size;
 212         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 213         props[ATOMIC_TYPE_LONG].size           = long_size;
 214         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 215         props[ATOMIC_TYPE_ULONG].size          = long_size;
 216         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 217         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 218         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 219         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 220         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 221
 222         /* TODO: backend specific, need a way to query the backend for this.
 223          * The following are good settings for x86 */
 224         if (machine_size <= 32) {
 225                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 226                 props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 227                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 228                 props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 229                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 230         } else {
 231                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 232                 props[ATOMIC_TYPE_DOUBLE].alignment      = 8;
 233                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 8;
 234                 props[ATOMIC_TYPE_LONGLONG].alignment    = 8;
 235                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 8;
 236         }
 237         if (force_long_double_size > 0) {
 238                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = force_long_double_size;
 239                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = force_long_double_size;
 240         }
 241
 242         /* TODO: make this configurable for platforms which do not use byte sized
 243          * bools. */
 244         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 245
 246         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 247 }
 248
 249 void exit_types(void)
 250 {
 251         obstack_free(type_obst, NULL);
 252 }
 253
 254 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 255 {
 256         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 257         if (qualifiers & TYPE_QUALIFIER_CONST) {
 258                 print_string(" const" + sep);
 259                 sep = 0;
 260         }
 261         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 262                 print_string(" volatile" + sep);
 263                 sep = 0;
 264         }
 265         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 266                 print_string(" restrict" + sep);
 267                 sep = 0;
 268         }
 269         if (sep == 0 && q & QUAL_SEP_END)
 270                 print_char(' ');
 271 }
 272
 273 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 274 {
 275         switch(kind) {
 276         case ATOMIC_TYPE_INVALID: break;
 277         case ATOMIC_TYPE_VOID:        return "void";
 278         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 279         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 280         case ATOMIC_TYPE_CHAR:        return "char";
 281         case ATOMIC_TYPE_SCHAR:       return "signed char";
 282         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 283         case ATOMIC_TYPE_INT:         return "int";
 284         case ATOMIC_TYPE_UINT:        return "unsigned int";
 285         case ATOMIC_TYPE_SHORT:       return "short";
 286         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 287         case ATOMIC_TYPE_LONG:        return "long";
 288         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 289         case ATOMIC_TYPE_LONGLONG:    return "long long";
 290         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 291         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 292         case ATOMIC_TYPE_FLOAT:       return "float";
 293         case ATOMIC_TYPE_DOUBLE:      return "double";
 294         }
 295         return "INVALIDATOMIC";
 296 }
 297
 298 /**
 299  * Prints the name of an atomic type kinds.
 300  *
 301  * @param kind  The type kind.
 302  */
 303 static void print_atomic_kinds(atomic_type_kind_t kind)
 304 {
 305         const char *s = get_atomic_kind_name(kind);
 306         print_string(s);
 307 }
 308
 309 /**
 310  * Prints the name of an atomic type.
 311  *
 312  * @param type  The type.
 313  */
 314 static void print_atomic_type(const atomic_type_t *type)
 315 {
 316         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 317         print_atomic_kinds(type->akind);
 318 }
 319
 320 /**
 321  * Prints the name of a complex type.
 322  *
 323  * @param type  The type.
 324  */
 325 static void print_complex_type(const complex_type_t *type)
 326 {
 327         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 328         print_string("_Complex");
 329         print_atomic_kinds(type->akind);
 330 }
 331
 332 /**
 333  * Prints the name of an imaginary type.
 334  *
 335  * @param type  The type.
 336  */
 337 static void print_imaginary_type(const imaginary_type_t *type)
 338 {
 339         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 340         print_string("_Imaginary ");
 341         print_atomic_kinds(type->akind);
 342 }
 343
 344 /**
 345  * Print the first part (the prefix) of a type.
 346  *
 347  * @param type   The type to print.
 348  */
 349 static void print_function_type_pre(const function_type_t *type)
 350 {
 351         switch (type->linkage) {
 352                 case LINKAGE_INVALID:
 353                         break;
 354
 355                 case LINKAGE_C:
 356                         if (c_mode & _CXX)
 357                                 print_string("extern \"C\" ");
 358                         break;
 359
 360                 case LINKAGE_CXX:
 361                         if (!(c_mode & _CXX))
 362                                 print_string("extern \"C++\" ");
 363                         break;
 364         }
 365
 366         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 367
 368         intern_print_type_pre(type->return_type);
 369
 370         cc_kind_t cc = type->calling_convention;
 371 restart:
 372         switch (cc) {
 373         case CC_CDECL:    print_string(" __cdecl");    break;
 374         case CC_STDCALL:  print_string(" __stdcall");  break;
 375         case CC_FASTCALL: print_string(" __fastcall"); break;
 376         case CC_THISCALL: print_string(" __thiscall"); break;
 377         case CC_DEFAULT:
 378                 if (default_calling_convention != CC_CDECL) {
 379                         /* show the default calling convention if its not cdecl */
 380                         cc = default_calling_convention;
 381                         goto restart;
 382                 }
 383                 break;
 384         }
 385 }
 386
 387 /**
 388  * Print the second part (the postfix) of a type.
 389  *
 390  * @param type   The type to print.
 391  */
 392 static void print_function_type_post(const function_type_t *type,
 393                                      const scope_t *parameters)
 394 {
 395         print_string("(");
 396         bool first = true;
 397         if (parameters == NULL) {
 398                 function_parameter_t *parameter = type->parameters;
 399                 for( ; parameter != NULL; parameter = parameter->next) {
 400                         if (first) {
 401                                 first = false;
 402                         } else {
 403                                 print_string(", ");
 404                         }
 405                         print_type(parameter->type);
 406                 }
 407         } else {
 408                 entity_t *parameter = parameters->entities;
 409                 for (; parameter != NULL; parameter = parameter->base.next) {
 410                         if (parameter->kind != ENTITY_PARAMETER)
 411                                 continue;
 412
 413                         if (first) {
 414                                 first = false;
 415                         } else {
 416                                 print_string(", ");
 417                         }
 418                         const type_t *const type = parameter->declaration.type;
 419                         if (type == NULL) {
 420                                 print_string(parameter->base.symbol->string);
 421                         } else {
 422                                 print_type_ext(type, parameter->base.symbol, NULL);
 423                         }
 424                 }
 425         }
 426         if (type->variadic) {
 427                 if (first) {
 428                         first = false;
 429                 } else {
 430                         print_string(", ");
 431                 }
 432                 print_string("...");
 433         }
 434         if (first && !type->unspecified_parameters) {
 435                 print_string("void");
 436         }
 437         print_string(")");
 438
 439         intern_print_type_post(type->return_type);
 440 }
 441
 442 /**
 443  * Prints the prefix part of a pointer type.
 444  *
 445  * @param type   The pointer type.
 446  */
 447 static void print_pointer_type_pre(const pointer_type_t *type)
 448 {
 449         type_t const *const points_to = type->points_to;
 450         intern_print_type_pre(points_to);
 451         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 452                 print_string(" (");
 453         variable_t *const variable = type->base_variable;
 454         if (variable != NULL) {
 455                 print_string(" __based(");
 456                 print_string(variable->base.base.symbol->string);
 457                 print_string(") ");
 458         }
 459         print_string("*");
 460         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 461 }
 462
 463 /**
 464  * Prints the postfix part of a pointer type.
 465  *
 466  * @param type   The pointer type.
 467  */
 468 static void print_pointer_type_post(const pointer_type_t *type)
 469 {
 470         type_t const *const points_to = type->points_to;
 471         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 472                 print_string(")");
 473         intern_print_type_post(points_to);
 474 }
 475
 476 /**
 477  * Prints the prefix part of a reference type.
 478  *
 479  * @param type   The reference type.
 480  */
 481 static void print_reference_type_pre(const reference_type_t *type)
 482 {
 483         type_t const *const refers_to = type->refers_to;
 484         intern_print_type_pre(refers_to);
 485         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 486                 print_string(" (");
 487         print_string("&");
 488 }
 489
 490 /**
 491  * Prints the postfix part of a reference type.
 492  *
 493  * @param type   The reference type.
 494  */
 495 static void print_reference_type_post(const reference_type_t *type)
 496 {
 497         type_t const *const refers_to = type->refers_to;
 498         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 499                 print_string(")");
 500         intern_print_type_post(refers_to);
 501 }
 502
 503 /**
 504  * Prints the prefix part of an array type.
 505  *
 506  * @param type   The array type.
 507  */
 508 static void print_array_type_pre(const array_type_t *type)
 509 {
 510         intern_print_type_pre(type->element_type);
 511 }
 512
 513 /**
 514  * Prints the postfix part of an array type.
 515  *
 516  * @param type   The array type.
 517  */
 518 static void print_array_type_post(const array_type_t *type)
 519 {
 520         print_string("[");
 521         if (type->is_static) {
 522                 print_string("static ");
 523         }
 524         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 525         if (type->size_expression != NULL
 526                         && (print_implicit_array_size || !type->has_implicit_size)) {
 527                 print_expression(type->size_expression);
 528         }
 529         print_string("]");
 530         intern_print_type_post(type->element_type);
 531 }
 532
 533 /**
 534  * Prints the postfix part of a bitfield type.
 535  *
 536  * @param type   The array type.
 537  */
 538 static void print_bitfield_type_post(const bitfield_type_t *type)
 539 {
 540         print_string(" : ");
 541         print_expression(type->size_expression);
 542         intern_print_type_post(type->base_type);
 543 }
 544
 545 /**
 546  * Prints an enum definition.
 547  *
 548  * @param declaration  The enum's type declaration.
 549  */
 550 void print_enum_definition(const enum_t *enume)
 551 {
 552         print_string("{\n");
 553
 554         change_indent(1);
 555
 556         entity_t *entry = enume->base.next;
 557         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 558                entry = entry->base.next) {
 559
 560                 print_indent();
 561                 print_string(entry->base.symbol->string);
 562                 if (entry->enum_value.value != NULL) {
 563                         print_string(" = ");
 564
 565                         /* skip the implicit cast */
 566                         expression_t *expression = entry->enum_value.value;
 567                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 568                                 expression = expression->unary.value;
 569                         }
 570                         print_expression(expression);
 571                 }
 572                 print_string(",\n");
 573         }
 574
 575         change_indent(-1);
 576         print_indent();
 577         print_string("}");
 578 }
 579
 580 /**
 581  * Prints an enum type.
 582  *
 583  * @param type  The enum type.
 584  */
 585 static void print_type_enum(const enum_type_t *type)
 586 {
 587         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 588         print_string("enum ");
 589
 590         enum_t   *enume  = type->enume;
 591         symbol_t *symbol = enume->base.symbol;
 592         if (symbol != NULL) {
 593                 print_string(symbol->string);
 594         } else {
 595                 print_enum_definition(enume);
 596         }
 597 }
 598
 599 /**
 600  * Print the compound part of a compound type.
 601  */
 602 void print_compound_definition(const compound_t *compound)
 603 {
 604         print_string("{\n");
 605         change_indent(1);
 606
 607         entity_t *entity = compound->members.entities;
 608         for( ; entity != NULL; entity = entity->base.next) {
 609                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 610                         continue;
 611
 612                 print_indent();
 613                 print_entity(entity);
 614                 print_string("\n");
 615         }
 616
 617         change_indent(-1);
 618         print_indent();
 619         print_string("}");
 620         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 621                 print_string("__attribute__((__transparent_union__))");
 622         }
 623 }
 624
 625 /**
 626  * Prints a compound type.
 627  *
 628  * @param type  The compound type.
 629  */
 630 static void print_compound_type(const compound_type_t *type)
 631 {
 632         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 633
 634         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 635                 print_string("struct ");
 636         } else {
 637                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 638                 print_string("union ");
 639         }
 640
 641         compound_t *compound = type->compound;
 642         symbol_t   *symbol   = compound->base.symbol;
 643         if (symbol != NULL) {
 644                 print_string(symbol->string);
 645         } else {
 646                 print_compound_definition(compound);
 647         }
 648 }
 649
 650 /**
 651  * Prints the prefix part of a typedef type.
 652  *
 653  * @param type   The typedef type.
 654  */
 655 static void print_typedef_type_pre(const typedef_type_t *const type)
 656 {
 657         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 658         print_string(type->typedefe->base.symbol->string);
 659 }
 660
 661 /**
 662  * Prints the prefix part of a typeof type.
 663  *
 664  * @param type   The typeof type.
 665  */
 666 static void print_typeof_type_pre(const typeof_type_t *const type)
 667 {
 668         print_string("typeof(");
 669         if (type->expression != NULL) {
 670                 print_expression(type->expression);
 671         } else {
 672                 print_type(type->typeof_type);
 673         }
 674         print_string(")");
 675 }
 676
 677 /**
 678  * Prints the prefix part of a type.
 679  *
 680  * @param type   The type.
 681  */
 682 static void intern_print_type_pre(const type_t *const type)
 683 {
 684         switch(type->kind) {
 685         case TYPE_ERROR:
 686                 print_string("<error>");
 687                 return;
 688         case TYPE_INVALID:
 689                 print_string("<invalid>");
 690                 return;
 691         case TYPE_ENUM:
 692                 print_type_enum(&type->enumt);
 693                 return;
 694         case TYPE_ATOMIC:
 695                 print_atomic_type(&type->atomic);
 696                 return;
 697         case TYPE_COMPLEX:
 698                 print_complex_type(&type->complex);
 699                 return;
 700         case TYPE_IMAGINARY:
 701                 print_imaginary_type(&type->imaginary);
 702                 return;
 703         case TYPE_COMPOUND_STRUCT:
 704         case TYPE_COMPOUND_UNION:
 705                 print_compound_type(&type->compound);
 706                 return;
 707         case TYPE_FUNCTION:
 708                 print_function_type_pre(&type->function);
 709                 return;
 710         case TYPE_POINTER:
 711                 print_pointer_type_pre(&type->pointer);
 712                 return;
 713         case TYPE_REFERENCE:
 714                 print_reference_type_pre(&type->reference);
 715                 return;
 716         case TYPE_BITFIELD:
 717                 intern_print_type_pre(type->bitfield.base_type);
 718                 return;
 719         case TYPE_ARRAY:
 720                 print_array_type_pre(&type->array);
 721                 return;
 722         case TYPE_TYPEDEF:
 723                 print_typedef_type_pre(&type->typedeft);
 724                 return;
 725         case TYPE_TYPEOF:
 726                 print_typeof_type_pre(&type->typeoft);
 727                 return;
 728         }
 729         print_string("unknown");
 730 }
 731
 732 /**
 733  * Prints the postfix part of a type.
 734  *
 735  * @param type   The type.
 736  */
 737 static void intern_print_type_post(const type_t *const type)
 738 {
 739         switch(type->kind) {
 740         case TYPE_FUNCTION:
 741                 print_function_type_post(&type->function, NULL);
 742                 return;
 743         case TYPE_POINTER:
 744                 print_pointer_type_post(&type->pointer);
 745                 return;
 746         case TYPE_REFERENCE:
 747                 print_reference_type_post(&type->reference);
 748                 return;
 749         case TYPE_ARRAY:
 750                 print_array_type_post(&type->array);
 751                 return;
 752         case TYPE_BITFIELD:
 753                 print_bitfield_type_post(&type->bitfield);
 754                 return;
 755         case TYPE_ERROR:
 756         case TYPE_INVALID:
 757         case TYPE_ATOMIC:
 758         case TYPE_COMPLEX:
 759         case TYPE_IMAGINARY:
 760         case TYPE_ENUM:
 761         case TYPE_COMPOUND_STRUCT:
 762         case TYPE_COMPOUND_UNION:
 763         case TYPE_TYPEOF:
 764         case TYPE_TYPEDEF:
 765                 break;
 766         }
 767 }
 768
 769 /**
 770  * Prints a type.
 771  *
 772  * @param type   The type.
 773  */
 774 void print_type(const type_t *const type)
 775 {
 776         print_type_ext(type, NULL, NULL);
 777 }
 778
 779 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 780                     const scope_t *parameters)
 781 {
 782         intern_print_type_pre(type);
 783         if (symbol != NULL) {
 784                 print_string(" ");
 785                 print_string(symbol->string);
 786         }
 787         if (type->kind == TYPE_FUNCTION) {
 788                 print_function_type_post(&type->function, parameters);
 789         } else {
 790                 intern_print_type_post(type);
 791         }
 792 }
 793
 794 /**
 795  * Duplicates a type.
 796  *
 797  * @param type  The type to copy.
 798  * @return A copy of the type.
 799  *
 800  * @note This does not produce a deep copy!
 801  */
 802 type_t *duplicate_type(const type_t *type)
 803 {
 804         size_t size = get_type_struct_size(type->kind);
 805
 806         type_t *copy = obstack_alloc(type_obst, size);
 807         memcpy(copy, type, size);
 808         copy->base.firm_type = NULL;
 809
 810         return copy;
 811 }
 812
 813 /**
 814  * Returns the unqualified type of a given type.
 815  *
 816  * @param type  The type.
 817  * @returns The unqualified type.
 818  */
 819 type_t *get_unqualified_type(type_t *type)
 820 {
 821         assert(!is_typeref(type));
 822
 823         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 824                 return type;
 825
 826         type_t *unqualified_type          = duplicate_type(type);
 827         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 828
 829         return identify_new_type(unqualified_type);
 830 }
 831
 832 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 833 {
 834         type_t *type = skip_typeref(orig_type);
 835
 836         type_t *copy;
 837         if (is_type_array(type)) {
 838                 /* For array types the element type has to be adjusted */
 839                 type_t *element_type      = type->array.element_type;
 840                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 841
 842                 if (qual_element_type == element_type)
 843                         return orig_type;
 844
 845                 copy                     = duplicate_type(type);
 846                 copy->array.element_type = qual_element_type;
 847         } else if (is_type_valid(type)) {
 848                 if ((type->base.qualifiers & qual) == qual)
 849                         return orig_type;
 850
 851                 copy                   = duplicate_type(type);
 852                 copy->base.qualifiers |= qual;
 853         } else {
 854                 return type;
 855         }
 856
 857         return identify_new_type(copy);
 858 }
 859
 860 /**
 861  * Check if a type is valid.
 862  *
 863  * @param type  The type to check.
 864  * @return true if type represents a valid type.
 865  */
 866 bool type_valid(const type_t *type)
 867 {
 868         return type->kind != TYPE_INVALID;
 869 }
 870
 871 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 872                                   atomic_type_flag_t flag)
 873 {
 874         assert(kind <= ATOMIC_TYPE_LAST);
 875         return (atomic_type_properties[kind].flags & flag) != 0;
 876 }
 877
 878 /**
 879  * Returns true if the given type is an integer type.
 880  *
 881  * @param type  The type to check.
 882  * @return True if type is an integer type.
 883  */
 884 bool is_type_integer(const type_t *type)
 885 {
 886         assert(!is_typeref(type));
 887
 888         if (type->kind == TYPE_ENUM)
 889                 return true;
 890         if (type->kind == TYPE_BITFIELD)
 891                 return true;
 892
 893         if (type->kind != TYPE_ATOMIC)
 894                 return false;
 895
 896         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 897 }
 898
 899 /**
 900  * Returns true if the given type is an enum type.
 901  *
 902  * @param type  The type to check.
 903  * @return True if type is an enum type.
 904  */
 905 bool is_type_enum(const type_t *type)
 906 {
 907         assert(!is_typeref(type));
 908         return type->kind == TYPE_ENUM;
 909 }
 910
 911 /**
 912  * Returns true if the given type is an floating point type.
 913  *
 914  * @param type  The type to check.
 915  * @return True if type is a floating point type.
 916  */
 917 bool is_type_float(const type_t *type)
 918 {
 919         assert(!is_typeref(type));
 920
 921         if (type->kind != TYPE_ATOMIC)
 922                 return false;
 923
 924         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 925 }
 926
 927 /**
 928  * Returns true if the given type is an complex type.
 929  *
 930  * @param type  The type to check.
 931  * @return True if type is a complex type.
 932  */
 933 bool is_type_complex(const type_t *type)
 934 {
 935         assert(!is_typeref(type));
 936
 937         if (type->kind != TYPE_ATOMIC)
 938                 return false;
 939
 940         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 941 }
 942
 943 /**
 944  * Returns true if the given type is a signed type.
 945  *
 946  * @param type  The type to check.
 947  * @return True if type is a signed type.
 948  */
 949 bool is_type_signed(const type_t *type)
 950 {
 951         assert(!is_typeref(type));
 952
 953         /* enum types are int for now */
 954         if (type->kind == TYPE_ENUM)
 955                 return true;
 956         if (type->kind == TYPE_BITFIELD)
 957                 return is_type_signed(type->bitfield.base_type);
 958
 959         if (type->kind != TYPE_ATOMIC)
 960                 return false;
 961
 962         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 963 }
 964
 965 /**
 966  * Returns true if the given type represents an arithmetic type.
 967  *
 968  * @param type  The type to check.
 969  * @return True if type represents an arithmetic type.
 970  */
 971 bool is_type_arithmetic(const type_t *type)
 972 {
 973         assert(!is_typeref(type));
 974
 975         switch(type->kind) {
 976         case TYPE_BITFIELD:
 977         case TYPE_ENUM:
 978                 return true;
 979         case TYPE_ATOMIC:
 980                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 981         case TYPE_COMPLEX:
 982                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 983         case TYPE_IMAGINARY:
 984                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 985         default:
 986                 return false;
 987         }
 988 }
 989
 990 /**
 991  * Returns true if the given type is an integer or float type.
 992  *
 993  * @param type  The type to check.
 994  * @return True if type is an integer or float type.
 995  */
 996 bool is_type_real(const type_t *type)
 997 {
 998         /* 6.2.5 (17) */
 999         return is_type_integer(type) || is_type_float(type);
1000 }
1001
1002 /**
1003  * Returns true if the given type represents a scalar type.
1004  *
1005  * @param type  The type to check.
1006  * @return True if type represents a scalar type.
1007  */
1008 bool is_type_scalar(const type_t *type)
1009 {
1010         assert(!is_typeref(type));
1011
1012         if (type->kind == TYPE_POINTER)
1013                 return true;
1014
1015         return is_type_arithmetic(type);
1016 }
1017
1018 /**
1019  * Check if a given type is incomplete.
1020  *
1021  * @param type  The type to check.
1022  * @return True if the given type is incomplete (ie. just forward).
1023  */
1024 bool is_type_incomplete(const type_t *type)
1025 {
1026         assert(!is_typeref(type));
1027
1028         switch(type->kind) {
1029         case TYPE_COMPOUND_STRUCT:
1030         case TYPE_COMPOUND_UNION: {
1031                 const compound_type_t *compound_type = &type->compound;
1032                 return !compound_type->compound->complete;
1033         }
1034         case TYPE_ENUM:
1035                 return false;
1036
1037         case TYPE_ARRAY:
1038                 return type->array.size_expression == NULL
1039                         && !type->array.size_constant;
1040
1041         case TYPE_ATOMIC:
1042                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1043
1044         case TYPE_COMPLEX:
1045                 return type->complex.akind == ATOMIC_TYPE_VOID;
1046
1047         case TYPE_IMAGINARY:
1048                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1049
1050         case TYPE_BITFIELD:
1051         case TYPE_FUNCTION:
1052         case TYPE_POINTER:
1053         case TYPE_REFERENCE:
1054         case TYPE_ERROR:
1055                 return false;
1056
1057         case TYPE_TYPEDEF:
1058         case TYPE_TYPEOF:
1059                 panic("is_type_incomplete called without typerefs skipped");
1060         case TYPE_INVALID:
1061                 break;
1062         }
1063
1064         panic("invalid type found");
1065 }
1066
1067 bool is_type_object(const type_t *type)
1068 {
1069         return !is_type_function(type) && !is_type_incomplete(type);
1070 }
1071
1072 /**
1073  * Check if two function types are compatible.
1074  */
1075 static bool function_types_compatible(const function_type_t *func1,
1076                                       const function_type_t *func2)
1077 {
1078         const type_t* const ret1 = skip_typeref(func1->return_type);
1079         const type_t* const ret2 = skip_typeref(func2->return_type);
1080         if (!types_compatible(ret1, ret2))
1081                 return false;
1082
1083         if (func1->linkage != func2->linkage)
1084                 return false;
1085
1086         cc_kind_t cc1 = func1->calling_convention;
1087         if (cc1 == CC_DEFAULT)
1088                 cc1 = default_calling_convention;
1089         cc_kind_t cc2 = func2->calling_convention;
1090         if (cc2 == CC_DEFAULT)
1091                 cc2 = default_calling_convention;
1092
1093         if (cc1 != cc2)
1094                 return false;
1095
1096         if (func1->variadic != func2->variadic)
1097                 return false;
1098
1099         /* can parameters be compared? */
1100         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1101                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1102                 return true;
1103
1104         /* TODO: handling of unspecified parameters not correct yet */
1105
1106         /* all argument types must be compatible */
1107         function_parameter_t *parameter1 = func1->parameters;
1108         function_parameter_t *parameter2 = func2->parameters;
1109         for ( ; parameter1 != NULL && parameter2 != NULL;
1110                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1111                 type_t *parameter1_type = skip_typeref(parameter1->type);
1112                 type_t *parameter2_type = skip_typeref(parameter2->type);
1113
1114                 parameter1_type = get_unqualified_type(parameter1_type);
1115                 parameter2_type = get_unqualified_type(parameter2_type);
1116
1117                 if (!types_compatible(parameter1_type, parameter2_type))
1118                         return false;
1119         }
1120         /* same number of arguments? */
1121         if (parameter1 != NULL || parameter2 != NULL)
1122                 return false;
1123
1124         return true;
1125 }
1126
1127 /**
1128  * Check if two array types are compatible.
1129  */
1130 static bool array_types_compatible(const array_type_t *array1,
1131                                    const array_type_t *array2)
1132 {
1133         type_t *element_type1 = skip_typeref(array1->element_type);
1134         type_t *element_type2 = skip_typeref(array2->element_type);
1135         if (!types_compatible(element_type1, element_type2))
1136                 return false;
1137
1138         if (!array1->size_constant || !array2->size_constant)
1139                 return true;
1140
1141         return array1->size == array2->size;
1142 }
1143
1144 /**
1145  * Check if two types are compatible.
1146  */
1147 bool types_compatible(const type_t *type1, const type_t *type2)
1148 {
1149         assert(!is_typeref(type1));
1150         assert(!is_typeref(type2));
1151
1152         /* shortcut: the same type is always compatible */
1153         if (type1 == type2)
1154                 return true;
1155
1156         if (!is_type_valid(type1) || !is_type_valid(type2))
1157                 return true;
1158
1159         if (type1->base.qualifiers != type2->base.qualifiers)
1160                 return false;
1161         if (type1->kind != type2->kind)
1162                 return false;
1163
1164         switch (type1->kind) {
1165         case TYPE_FUNCTION:
1166                 return function_types_compatible(&type1->function, &type2->function);
1167         case TYPE_ATOMIC:
1168                 return type1->atomic.akind == type2->atomic.akind;
1169         case TYPE_COMPLEX:
1170                 return type1->complex.akind == type2->complex.akind;
1171         case TYPE_IMAGINARY:
1172                 return type1->imaginary.akind == type2->imaginary.akind;
1173         case TYPE_ARRAY:
1174                 return array_types_compatible(&type1->array, &type2->array);
1175
1176         case TYPE_POINTER: {
1177                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1178                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1179                 return types_compatible(to1, to2);
1180         }
1181
1182         case TYPE_REFERENCE: {
1183                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1184                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1185                 return types_compatible(to1, to2);
1186         }
1187
1188         case TYPE_COMPOUND_STRUCT:
1189         case TYPE_COMPOUND_UNION: {
1190
1191
1192                 break;
1193         }
1194         case TYPE_ENUM:
1195                 /* TODO: not implemented */
1196                 break;
1197
1198         case TYPE_BITFIELD:
1199                 /* not sure if this makes sense or is even needed, implement it if you
1200                  * really need it! */
1201                 panic("type compatibility check for bitfield type");
1202
1203         case TYPE_ERROR:
1204                 /* Hmm, the error type should be compatible to all other types */
1205                 return true;
1206         case TYPE_INVALID:
1207                 panic("invalid type found in compatible types");
1208         case TYPE_TYPEDEF:
1209         case TYPE_TYPEOF:
1210                 panic("typerefs not skipped in compatible types?!?");
1211         }
1212
1213         /* TODO: incomplete */
1214         return false;
1215 }
1216
1217 /**
1218  * Skip all typerefs and return the underlying type.
1219  */
1220 type_t *skip_typeref(type_t *type)
1221 {
1222         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1223
1224         while (true) {
1225                 switch (type->kind) {
1226                 case TYPE_ERROR:
1227                         return type;
1228                 case TYPE_TYPEDEF: {
1229                         qualifiers |= type->base.qualifiers;
1230
1231                         const typedef_type_t *typedef_type = &type->typedeft;
1232                         if (typedef_type->resolved_type != NULL) {
1233                                 type = typedef_type->resolved_type;
1234                                 break;
1235                         }
1236                         type = typedef_type->typedefe->type;
1237                         continue;
1238                 }
1239                 case TYPE_TYPEOF:
1240                         qualifiers |= type->base.qualifiers;
1241                         type        = type->typeoft.typeof_type;
1242                         continue;
1243                 default:
1244                         break;
1245                 }
1246                 break;
1247         }
1248
1249         if (qualifiers != TYPE_QUALIFIER_NONE) {
1250                 type_t *const copy = duplicate_type(type);
1251
1252                 /* for const with typedefed array type the element type has to be
1253                  * adjusted */
1254                 if (is_type_array(copy)) {
1255                         type_t *element_type           = copy->array.element_type;
1256                         element_type                   = duplicate_type(element_type);
1257                         element_type->base.qualifiers |= qualifiers;
1258                         copy->array.element_type       = element_type;
1259                 } else {
1260                         copy->base.qualifiers |= qualifiers;
1261                 }
1262
1263                 type = identify_new_type(copy);
1264         }
1265
1266         return type;
1267 }
1268
1269 unsigned get_type_size(type_t *type)
1270 {
1271         switch (type->kind) {
1272         case TYPE_INVALID:
1273                 break;
1274         case TYPE_ERROR:
1275                 return 0;
1276         case TYPE_ATOMIC:
1277                 return get_atomic_type_size(type->atomic.akind);
1278         case TYPE_COMPLEX:
1279                 return get_atomic_type_size(type->complex.akind) * 2;
1280         case TYPE_IMAGINARY:
1281                 return get_atomic_type_size(type->imaginary.akind);
1282         case TYPE_COMPOUND_UNION:
1283                 layout_union_type(&type->compound);
1284                 return type->compound.compound->size;
1285         case TYPE_COMPOUND_STRUCT:
1286                 layout_struct_type(&type->compound);
1287                 return type->compound.compound->size;
1288         case TYPE_ENUM:
1289                 return get_atomic_type_size(type->enumt.akind);
1290         case TYPE_FUNCTION:
1291                 return 0; /* non-const (but "address-const") */
1292         case TYPE_REFERENCE:
1293         case TYPE_POINTER:
1294                 /* TODO: make configurable by backend */
1295                 return 4;
1296         case TYPE_ARRAY: {
1297                 /* TODO: correct if element_type is aligned? */
1298                 il_size_t element_size = get_type_size(type->array.element_type);
1299                 return type->array.size * element_size;
1300         }
1301         case TYPE_BITFIELD:
1302                 return 0;
1303         case TYPE_TYPEDEF:
1304                 return get_type_size(type->typedeft.typedefe->type);
1305         case TYPE_TYPEOF:
1306                 if (type->typeoft.typeof_type) {
1307                         return get_type_size(type->typeoft.typeof_type);
1308                 } else {
1309                         return get_type_size(type->typeoft.expression->base.type);
1310                 }
1311         }
1312         panic("invalid type in get_type_size");
1313 }
1314
1315 unsigned get_type_alignment(type_t *type)
1316 {
1317         switch (type->kind) {
1318         case TYPE_INVALID:
1319                 break;
1320         case TYPE_ERROR:
1321                 return 0;
1322         case TYPE_ATOMIC:
1323                 return get_atomic_type_alignment(type->atomic.akind);
1324         case TYPE_COMPLEX:
1325                 return get_atomic_type_alignment(type->complex.akind);
1326         case TYPE_IMAGINARY:
1327                 return get_atomic_type_alignment(type->imaginary.akind);
1328         case TYPE_COMPOUND_UNION:
1329                 layout_union_type(&type->compound);
1330                 return type->compound.compound->alignment;
1331         case TYPE_COMPOUND_STRUCT:
1332                 layout_struct_type(&type->compound);
1333                 return type->compound.compound->alignment;
1334         case TYPE_ENUM:
1335                 return get_atomic_type_alignment(type->enumt.akind);
1336         case TYPE_FUNCTION:
1337                 /* what is correct here? */
1338                 return 4;
1339         case TYPE_REFERENCE:
1340         case TYPE_POINTER:
1341                 /* TODO: make configurable by backend */
1342                 return 4;
1343         case TYPE_ARRAY:
1344                 return get_type_alignment(type->array.element_type);
1345         case TYPE_BITFIELD:
1346                 return 0;
1347         case TYPE_TYPEDEF: {
1348                 il_alignment_t alignment
1349                         = get_type_alignment(type->typedeft.typedefe->type);
1350                 if (type->typedeft.typedefe->alignment > alignment)
1351                         alignment = type->typedeft.typedefe->alignment;
1352
1353                 return alignment;
1354         }
1355         case TYPE_TYPEOF:
1356                 if (type->typeoft.typeof_type) {
1357                         return get_type_alignment(type->typeoft.typeof_type);
1358                 } else {
1359                         return get_type_alignment(type->typeoft.expression->base.type);
1360                 }
1361         }
1362         panic("invalid type in get_type_alignment");
1363 }
1364
1365 decl_modifiers_t get_type_modifiers(const type_t *type)
1366 {
1367         switch(type->kind) {
1368         case TYPE_INVALID:
1369         case TYPE_ERROR:
1370                 break;
1371         case TYPE_COMPOUND_STRUCT:
1372         case TYPE_COMPOUND_UNION:
1373                 return type->compound.compound->modifiers;
1374         case TYPE_FUNCTION:
1375                 return type->function.modifiers;
1376         case TYPE_ENUM:
1377         case TYPE_ATOMIC:
1378         case TYPE_COMPLEX:
1379         case TYPE_IMAGINARY:
1380         case TYPE_REFERENCE:
1381         case TYPE_POINTER:
1382         case TYPE_BITFIELD:
1383         case TYPE_ARRAY:
1384                 return 0;
1385         case TYPE_TYPEDEF: {
1386                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1387                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1388                 return modifiers;
1389         }
1390         case TYPE_TYPEOF:
1391                 if (type->typeoft.typeof_type) {
1392                         return get_type_modifiers(type->typeoft.typeof_type);
1393                 } else {
1394                         return get_type_modifiers(type->typeoft.expression->base.type);
1395                 }
1396         }
1397         panic("invalid type found in get_type_modifiers");
1398 }
1399
1400 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1401 {
1402         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1403
1404         while (true) {
1405                 switch (type->base.kind) {
1406                 case TYPE_ERROR:
1407                         return TYPE_QUALIFIER_NONE;
1408                 case TYPE_TYPEDEF:
1409                         qualifiers |= type->base.qualifiers;
1410                         const typedef_type_t *typedef_type = &type->typedeft;
1411                         if (typedef_type->resolved_type != NULL)
1412                                 type = typedef_type->resolved_type;
1413                         else
1414                                 type = typedef_type->typedefe->type;
1415                         continue;
1416                 case TYPE_TYPEOF:
1417                         type = type->typeoft.typeof_type;
1418                         continue;
1419                 case TYPE_ARRAY:
1420                         if (skip_array_type) {
1421                                 type = type->array.element_type;
1422                                 continue;
1423                         }
1424                         break;
1425                 default:
1426                         break;
1427                 }
1428                 break;
1429         }
1430         return type->base.qualifiers | qualifiers;
1431 }
1432
1433 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1434 {
1435         assert(kind <= ATOMIC_TYPE_LAST);
1436         return atomic_type_properties[kind].size;
1437 }
1438
1439 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1440 {
1441         assert(kind <= ATOMIC_TYPE_LAST);
1442         return atomic_type_properties[kind].alignment;
1443 }
1444
1445 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1446 {
1447         assert(kind <= ATOMIC_TYPE_LAST);
1448         return atomic_type_properties[kind].flags;
1449 }
1450
1451 atomic_type_kind_t get_intptr_kind(void)
1452 {
1453         if (machine_size <= 32)
1454                 return ATOMIC_TYPE_INT;
1455         else if (machine_size <= 64)
1456                 return ATOMIC_TYPE_LONG;
1457         else
1458                 return ATOMIC_TYPE_LONGLONG;
1459 }
1460
1461 atomic_type_kind_t get_uintptr_kind(void)
1462 {
1463         if (machine_size <= 32)
1464                 return ATOMIC_TYPE_UINT;
1465         else if (machine_size <= 64)
1466                 return ATOMIC_TYPE_ULONG;
1467         else
1468                 return ATOMIC_TYPE_ULONGLONG;
1469 }
1470
1471 /**
1472  * Find the atomic type kind representing a given size (signed).
1473  */
1474 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1475 {
1476         static atomic_type_kind_t kinds[32];
1477
1478         assert(size < 32);
1479         atomic_type_kind_t kind = kinds[size];
1480         if (kind == ATOMIC_TYPE_INVALID) {
1481                 static const atomic_type_kind_t possible_kinds[] = {
1482                         ATOMIC_TYPE_SCHAR,
1483                         ATOMIC_TYPE_SHORT,
1484                         ATOMIC_TYPE_INT,
1485                         ATOMIC_TYPE_LONG,
1486                         ATOMIC_TYPE_LONGLONG
1487                 };
1488                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1489                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1490                                 kind = possible_kinds[i];
1491                                 break;
1492                         }
1493                 }
1494                 kinds[size] = kind;
1495         }
1496         return kind;
1497 }
1498
1499 /**
1500  * Find the atomic type kind representing a given size (signed).
1501  */
1502 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1503 {
1504         static atomic_type_kind_t kinds[32];
1505
1506         assert(size < 32);
1507         atomic_type_kind_t kind = kinds[size];
1508         if (kind == ATOMIC_TYPE_INVALID) {
1509                 static const atomic_type_kind_t possible_kinds[] = {
1510                         ATOMIC_TYPE_UCHAR,
1511                         ATOMIC_TYPE_USHORT,
1512                         ATOMIC_TYPE_UINT,
1513                         ATOMIC_TYPE_ULONG,
1514                         ATOMIC_TYPE_ULONGLONG
1515                 };
1516                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1517                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1518                                 kind = possible_kinds[i];
1519                                 break;
1520                         }
1521                 }
1522                 kinds[size] = kind;
1523         }
1524         return kind;
1525 }
1526
1527 /**
1528  * Hash the given type and return the "singleton" version
1529  * of it.
1530  */
1531 type_t *identify_new_type(type_t *type)
1532 {
1533         type_t *result = typehash_insert(type);
1534         if (result != type) {
1535                 obstack_free(type_obst, type);
1536         }
1537         return result;
1538 }
1539
1540 /**
1541  * Creates a new atomic type.
1542  *
1543  * @param akind       The kind of the atomic type.
1544  * @param qualifiers  Type qualifiers for the new type.
1545  */
1546 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1547 {
1548         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1549         memset(type, 0, sizeof(atomic_type_t));
1550
1551         type->kind            = TYPE_ATOMIC;
1552         type->base.qualifiers = qualifiers;
1553         type->atomic.akind    = akind;
1554
1555         return identify_new_type(type);
1556 }
1557
1558 /**
1559  * Creates a new complex type.
1560  *
1561  * @param akind       The kind of the atomic type.
1562  * @param qualifiers  Type qualifiers for the new type.
1563  */
1564 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1565 {
1566         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1567         memset(type, 0, sizeof(complex_type_t));
1568
1569         type->kind            = TYPE_COMPLEX;
1570         type->base.qualifiers = qualifiers;
1571         type->complex.akind   = akind;
1572
1573         return identify_new_type(type);
1574 }
1575
1576 /**
1577  * Creates a new imaginary type.
1578  *
1579  * @param akind       The kind of the atomic type.
1580  * @param qualifiers  Type qualifiers for the new type.
1581  */
1582 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1583 {
1584         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1585         memset(type, 0, sizeof(imaginary_type_t));
1586
1587         type->kind            = TYPE_IMAGINARY;
1588         type->base.qualifiers = qualifiers;
1589         type->imaginary.akind = akind;
1590
1591         return identify_new_type(type);
1592 }
1593
1594 /**
1595  * Creates a new pointer type.
1596  *
1597  * @param points_to   The points-to type for the new type.
1598  * @param qualifiers  Type qualifiers for the new type.
1599  */
1600 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1601 {
1602         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1603         memset(type, 0, sizeof(pointer_type_t));
1604
1605         type->kind                  = TYPE_POINTER;
1606         type->base.qualifiers       = qualifiers;
1607         type->pointer.points_to     = points_to;
1608         type->pointer.base_variable = NULL;
1609
1610         return identify_new_type(type);
1611 }
1612
1613 /**
1614  * Creates a new reference type.
1615  *
1616  * @param refers_to   The referred-to type for the new type.
1617  */
1618 type_t *make_reference_type(type_t *refers_to)
1619 {
1620         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1621         memset(type, 0, sizeof(reference_type_t));
1622
1623         type->kind                = TYPE_REFERENCE;
1624         type->base.qualifiers     = 0;
1625         type->reference.refers_to = refers_to;
1626
1627         return identify_new_type(type);
1628 }
1629
1630 /**
1631  * Creates a new based pointer type.
1632  *
1633  * @param points_to   The points-to type for the new type.
1634  * @param qualifiers  Type qualifiers for the new type.
1635  * @param variable    The based variable
1636  */
1637 type_t *make_based_pointer_type(type_t *points_to,
1638                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1639 {
1640         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1641         memset(type, 0, sizeof(pointer_type_t));
1642
1643         type->kind                  = TYPE_POINTER;
1644         type->base.qualifiers       = qualifiers;
1645         type->pointer.points_to     = points_to;
1646         type->pointer.base_variable = variable;
1647
1648         return identify_new_type(type);
1649 }
1650
1651
1652 type_t *make_array_type(type_t *element_type, size_t size,
1653                         type_qualifiers_t qualifiers)
1654 {
1655         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1656         memset(type, 0, sizeof(array_type_t));
1657
1658         type->kind                = TYPE_ARRAY;
1659         type->base.qualifiers     = qualifiers;
1660         type->array.element_type  = element_type;
1661         type->array.size          = size;
1662         type->array.size_constant = true;
1663
1664         return identify_new_type(type);
1665 }
1666
1667 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1668                                        il_alignment_t *struct_alignment,
1669                                                                            bool packed, entity_t *first)
1670 {
1671         il_size_t      offset     = *struct_offset;
1672         il_alignment_t alignment  = *struct_alignment;
1673         size_t         bit_offset = 0;
1674
1675         entity_t *member;
1676         for (member = first; member != NULL; member = member->base.next) {
1677                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1678                         continue;
1679
1680                 type_t *type = member->declaration.type;
1681                 if (type->kind != TYPE_BITFIELD)
1682                         break;
1683
1684                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1685                 il_alignment_t base_alignment = get_type_alignment(base_type);
1686                 il_alignment_t alignment_mask = base_alignment-1;
1687                 if (base_alignment > alignment)
1688                         alignment = base_alignment;
1689
1690                 size_t bit_size = type->bitfield.bit_size;
1691                 if (!packed) {
1692                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1693                         offset     &= ~alignment_mask;
1694                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1695
1696                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1697                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1698                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1699                                 bit_offset = 0;
1700                         }
1701                 }
1702
1703                 if (byte_order_big_endian) {
1704                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1705                         member->compound_member.offset     = offset & ~alignment_mask;
1706                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1707                 } else {
1708                         member->compound_member.offset     = offset;
1709                         member->compound_member.bit_offset = bit_offset;
1710                 }
1711
1712                 bit_offset += bit_size;
1713                 offset     += bit_offset / BITS_PER_BYTE;
1714                 bit_offset %= BITS_PER_BYTE;
1715         }
1716
1717         if (bit_offset > 0)
1718                 offset += 1;
1719
1720         *struct_offset    = offset;
1721         *struct_alignment = alignment;
1722         return member;
1723 }
1724
1725 void layout_struct_type(compound_type_t *type)
1726 {
1727         assert(type->compound != NULL);
1728
1729         compound_t *compound = type->compound;
1730         if (!compound->complete)
1731                 return;
1732         if (type->compound->layouted)
1733                 return;
1734
1735         il_size_t      offset    = 0;
1736         il_alignment_t alignment = compound->alignment;
1737         bool           need_pad  = false;
1738
1739         entity_t *entry = compound->members.entities;
1740         while (entry != NULL) {
1741                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1742                         entry = entry->base.next;
1743                         continue;
1744                 }
1745
1746                 type_t *m_type  = entry->declaration.type;
1747                 type_t *skipped = skip_typeref(m_type);
1748                 if (! is_type_valid(skipped)) {
1749                         entry = entry->base.next;
1750                         continue;
1751                 }
1752
1753                 if (skipped->kind == TYPE_BITFIELD) {
1754                         entry = pack_bitfield_members(&offset, &alignment,
1755                                                       compound->packed, entry);
1756                         continue;
1757                 }
1758
1759                 il_alignment_t m_alignment = get_type_alignment(m_type);
1760                 if (m_alignment > alignment)
1761                         alignment = m_alignment;
1762
1763                 if (!compound->packed) {
1764                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1765
1766                         if (new_offset > offset) {
1767                                 need_pad = true;
1768                                 offset   = new_offset;
1769                         }
1770                 }
1771
1772                 entry->compound_member.offset = offset;
1773                 offset += get_type_size(m_type);
1774
1775                 entry = entry->base.next;
1776         }
1777
1778         if (!compound->packed) {
1779                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1780                 if (new_offset > offset) {
1781                         need_pad = true;
1782                         offset   = new_offset;
1783                 }
1784         }
1785
1786         if (need_pad) {
1787                 if (warning.padded) {
1788                         warningf(&compound->base.source_position, "'%T' needs padding",
1789                                  type);
1790                 }
1791         } else if (compound->packed && warning.packed) {
1792                 warningf(&compound->base.source_position,
1793                          "superfluous packed attribute on '%T'", type);
1794         }
1795
1796         compound->size      = offset;
1797         compound->alignment = alignment;
1798         compound->layouted  = true;
1799 }
1800
1801 void layout_union_type(compound_type_t *type)
1802 {
1803         assert(type->compound != NULL);
1804
1805         compound_t *compound = type->compound;
1806         if (! compound->complete)
1807                 return;
1808
1809         il_size_t      size      = 0;
1810         il_alignment_t alignment = compound->alignment;
1811
1812         entity_t *entry = compound->members.entities;
1813         for (; entry != NULL; entry = entry->base.next) {
1814                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1815                         continue;
1816
1817                 type_t *m_type = entry->declaration.type;
1818                 if (! is_type_valid(skip_typeref(m_type)))
1819                         continue;
1820
1821                 entry->compound_member.offset = 0;
1822                 il_size_t m_size = get_type_size(m_type);
1823                 if (m_size > size)
1824                         size = m_size;
1825                 il_alignment_t m_alignment = get_type_alignment(m_type);
1826                 if (m_alignment > alignment)
1827                         alignment = m_alignment;
1828         }
1829         size = (size + alignment - 1) & -alignment;
1830
1831         compound->size      = size;
1832         compound->alignment = alignment;
1833 }
1834
1835 static function_parameter_t *allocate_parameter(type_t *const type)
1836 {
1837         function_parameter_t *const param
1838                 = obstack_alloc(type_obst, sizeof(*param));
1839         memset(param, 0, sizeof(*param));
1840         param->type = type;
1841         return param;
1842 }
1843
1844 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1845                              type_t *argument_type2)
1846 {
1847         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1848         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1849         parameter1->next = parameter2;
1850
1851         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1852         type->function.return_type = return_type;
1853         type->function.parameters  = parameter1;
1854         type->function.linkage     = LINKAGE_C;
1855
1856         return identify_new_type(type);
1857 }
1858
1859 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1860 {
1861         function_parameter_t *const parameter = allocate_parameter(argument_type);
1862
1863         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1864         type->function.return_type = return_type;
1865         type->function.parameters  = parameter;
1866         type->function.linkage     = LINKAGE_C;
1867
1868         return identify_new_type(type);
1869 }
1870
1871 type_t *make_function_1_type_variadic(type_t *return_type,
1872                                       type_t *argument_type)
1873 {
1874         function_parameter_t *const parameter = allocate_parameter(argument_type);
1875
1876         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1877         type->function.return_type = return_type;
1878         type->function.parameters  = parameter;
1879         type->function.variadic    = true;
1880         type->function.linkage     = LINKAGE_C;
1881
1882         return identify_new_type(type);
1883 }
1884
1885 type_t *make_function_0_type(type_t *return_type)
1886 {
1887         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1888         type->function.return_type = return_type;
1889         type->function.parameters  = NULL;
1890         type->function.linkage     = LINKAGE_C;
1891
1892         return identify_new_type(type);
1893 }
1894
1895 type_t *make_function_type(type_t *return_type, int n_types,
1896                            type_t *const *argument_types,
1897                                                    decl_modifiers_t modifiers)
1898 {
1899         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1900         type->function.return_type = return_type;
1901         type->function.modifiers  |= modifiers;
1902         type->function.linkage     = LINKAGE_C;
1903
1904         function_parameter_t *last  = NULL;
1905         for (int i = 0; i < n_types; ++i) {
1906                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1907                 if (last == NULL) {
1908                         type->function.parameters = parameter;
1909                 } else {
1910                         last->next = parameter;
1911                 }
1912                 last = parameter;
1913         }
1914
1915         return identify_new_type(type);
1916 }
1917
1918 /**
1919  * Debug helper. Prints the given type to stdout.
1920  */
1921 static __attribute__((unused))
1922 void dbg_type(const type_t *type)
1923 {
1924         print_to_file(stderr);
1925         print_type(type);
1926         print_string("\n");
1927         fflush(stderr);
1928 }