nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36
  37 /** The default calling convention. */
  38 cc_kind_t default_calling_convention = CC_CDECL;
  39
  40 static struct obstack type_obst;
  41 static bool           print_implicit_array_size = false;
  42
  43 static void intern_print_type_pre(const type_t *type);
  44 static void intern_print_type_post(const type_t *type);
  45
  46 /**
  47  * Returns the size of a type node.
  48  *
  49  * @param kind  the type kind
  50  */
  51 static size_t get_type_struct_size(type_kind_t kind)
  52 {
  53         static const size_t sizes[] = {
  54                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  55                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  56                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  57                 [TYPE_ENUM]            = sizeof(enum_type_t),
  58                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  59                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  60                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  61                 [TYPE_ARRAY]           = sizeof(array_type_t),
  62                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  63                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  64         };
  65         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  66         assert(kind <= TYPE_TYPEOF);
  67         assert(sizes[kind] != 0);
  68         return sizes[kind];
  69 }
  70
  71 type_t *allocate_type_zero(type_kind_t kind)
  72 {
  73         size_t  const size = get_type_struct_size(kind);
  74         type_t *const res  = obstack_alloc(&type_obst, size);
  75         memset(res, 0, size);
  76         res->base.kind = kind;
  77
  78         return res;
  79 }
  80
  81 /**
  82  * Properties of atomic types.
  83  */
  84 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  85         [ATOMIC_TYPE_VOID] = {
  86                 .size      = 0,
  87                 .alignment = 0,
  88                 .flags     = ATOMIC_TYPE_FLAG_NONE,
  89                 .rank      = 0,
  90         },
  91         [ATOMIC_TYPE_BOOL] = {
  92                 .size       = 1,
  93                 .alignment  = 1,
  94                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  95                 .rank       = 1,
  96         },
  97         [ATOMIC_TYPE_CHAR] = {
  98                 .size      = 1,
  99                 .alignment = 1,
 100                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 101                 .rank      = 2,
 102         },
 103         [ATOMIC_TYPE_SCHAR] = {
 104                 .size      = 1,
 105                 .alignment = 1,
 106                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 107                            | ATOMIC_TYPE_FLAG_SIGNED,
 108                 .rank      = 2,
 109         },
 110         [ATOMIC_TYPE_UCHAR] = {
 111                 .size      = 1,
 112                 .alignment = 1,
 113                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114                 .rank      = 2,
 115         },
 116         [ATOMIC_TYPE_SHORT] = {
 117                 .size       = 2,
 118                 .alignment  = 2,
 119                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 120                               | ATOMIC_TYPE_FLAG_SIGNED,
 121                 .rank       = 3,
 122         },
 123         [ATOMIC_TYPE_USHORT] = {
 124                 .size       = 2,
 125                 .alignment  = 2,
 126                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 127                 .rank       = 3,
 128         },
 129         [ATOMIC_TYPE_INT] = {
 130                 .size       = (unsigned) -1,
 131                 .alignment  = (unsigned) -1,
 132                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 133                               | ATOMIC_TYPE_FLAG_SIGNED,
 134                 .rank       = 4,
 135         },
 136         [ATOMIC_TYPE_UINT] = {
 137                 .size       = (unsigned) -1,
 138                 .alignment  = (unsigned) -1,
 139                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 140                 .rank       = 4,
 141         },
 142         [ATOMIC_TYPE_LONG] = {
 143                 .size       = (unsigned) -1,
 144                 .alignment  = (unsigned) -1,
 145                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 146                               | ATOMIC_TYPE_FLAG_SIGNED,
 147                 .rank       = 5,
 148         },
 149         [ATOMIC_TYPE_ULONG] = {
 150                 .size       = (unsigned) -1,
 151                 .alignment  = (unsigned) -1,
 152                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 153                 .rank       = 5,
 154         },
 155         [ATOMIC_TYPE_LONGLONG] = {
 156                 .size       = 8,
 157                 .alignment  = 8,
 158                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 159                               | ATOMIC_TYPE_FLAG_SIGNED,
 160                 .rank       = 6,
 161         },
 162         [ATOMIC_TYPE_ULONGLONG] = {
 163                 .size       = 8,
 164                 .alignment  = 8,
 165                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 166                 .rank       = 6,
 167         },
 168         [ATOMIC_TYPE_FLOAT] = {
 169                 .size       = 4,
 170                 .alignment  = 4,
 171                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 172                               | ATOMIC_TYPE_FLAG_SIGNED,
 173                 .rank       = 0,
 174         },
 175         [ATOMIC_TYPE_DOUBLE] = {
 176                 .size       = 8,
 177                 .alignment  = 8,
 178                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 179                               | ATOMIC_TYPE_FLAG_SIGNED,
 180                 .rank       = 0,
 181         },
 182         [ATOMIC_TYPE_WCHAR_T] = {
 183                 .size      = (unsigned)-1,
 184                 .alignment = (unsigned)-1,
 185                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 186                 .rank      = (unsigned)-1,
 187         },
 188 };
 189 atomic_type_properties_t pointer_properties = {
 190         .size      = 4,
 191         .alignment = 4,
 192         .flags     = ATOMIC_TYPE_FLAG_NONE,
 193 };
 194
 195 static inline bool is_po2(unsigned x)
 196 {
 197         return (x & (x-1)) == 0;
 198 }
 199
 200 void init_types(unsigned machine_size)
 201 {
 202         obstack_init(&type_obst);
 203
 204         atomic_type_properties_t *props = atomic_type_properties;
 205
 206         /* atempt to set some sane defaults based on machine size */
 207
 208         unsigned int_size   = machine_size < 32 ? 2 : 4;
 209         unsigned long_size  = machine_size < 64 ? 4 : 8;
 210
 211         props[ATOMIC_TYPE_INT].size        = int_size;
 212         props[ATOMIC_TYPE_INT].alignment   = int_size;
 213         props[ATOMIC_TYPE_UINT].size       = int_size;
 214         props[ATOMIC_TYPE_UINT].alignment  = int_size;
 215         props[ATOMIC_TYPE_LONG].size       = long_size;
 216         props[ATOMIC_TYPE_LONG].alignment  = long_size;
 217         props[ATOMIC_TYPE_ULONG].size      = long_size;
 218         props[ATOMIC_TYPE_ULONG].alignment = long_size;
 219
 220         pointer_properties.size             = long_size;
 221         pointer_properties.alignment        = long_size;
 222         pointer_properties.struct_alignment = long_size;
 223
 224         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 225         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 226
 227         /* set struct alignments to the same value as alignment */
 228         for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) {
 229                 props[i].struct_alignment = props[i].alignment;
 230         }
 231 }
 232
 233 void exit_types(void)
 234 {
 235         obstack_free(&type_obst, NULL);
 236 }
 237
 238 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 239 {
 240         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 241         if (qualifiers & TYPE_QUALIFIER_CONST) {
 242                 print_string(" const" + sep);
 243                 sep = 0;
 244         }
 245         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 246                 print_string(" volatile" + sep);
 247                 sep = 0;
 248         }
 249         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 250                 print_string(" restrict" + sep);
 251                 sep = 0;
 252         }
 253         if (sep == 0 && q & QUAL_SEP_END)
 254                 print_char(' ');
 255 }
 256
 257 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 258 {
 259         switch(kind) {
 260         case ATOMIC_TYPE_INVALID: break;
 261         case ATOMIC_TYPE_VOID:        return "void";
 262         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 263         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 264         case ATOMIC_TYPE_CHAR:        return "char";
 265         case ATOMIC_TYPE_SCHAR:       return "signed char";
 266         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 267         case ATOMIC_TYPE_INT:         return "int";
 268         case ATOMIC_TYPE_UINT:        return "unsigned int";
 269         case ATOMIC_TYPE_SHORT:       return "short";
 270         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 271         case ATOMIC_TYPE_LONG:        return "long";
 272         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 273         case ATOMIC_TYPE_LONGLONG:    return "long long";
 274         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 275         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 276         case ATOMIC_TYPE_FLOAT:       return "float";
 277         case ATOMIC_TYPE_DOUBLE:      return "double";
 278         }
 279         return "INVALIDATOMIC";
 280 }
 281
 282 /**
 283  * Prints the name of an atomic type kinds.
 284  *
 285  * @param kind  The type kind.
 286  */
 287 static void print_atomic_kinds(atomic_type_kind_t kind)
 288 {
 289         const char *s = get_atomic_kind_name(kind);
 290         print_string(s);
 291 }
 292
 293 /**
 294  * Prints the name of an atomic type.
 295  *
 296  * @param type  The type.
 297  */
 298 static void print_atomic_type(const atomic_type_t *type)
 299 {
 300         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 301         print_atomic_kinds(type->akind);
 302 }
 303
 304 /**
 305  * Prints the name of a complex type.
 306  *
 307  * @param type  The type.
 308  */
 309 static void print_complex_type(const atomic_type_t *type)
 310 {
 311         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 312         print_string("_Complex");
 313         print_atomic_kinds(type->akind);
 314 }
 315
 316 /**
 317  * Prints the name of an imaginary type.
 318  *
 319  * @param type  The type.
 320  */
 321 static void print_imaginary_type(const atomic_type_t *type)
 322 {
 323         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 324         print_string("_Imaginary ");
 325         print_atomic_kinds(type->akind);
 326 }
 327
 328 /**
 329  * Print the first part (the prefix) of a type.
 330  *
 331  * @param type   The type to print.
 332  */
 333 static void print_function_type_pre(const function_type_t *type)
 334 {
 335         switch (type->linkage) {
 336                 case LINKAGE_C:
 337                         if (c_mode & _CXX)
 338                                 print_string("extern \"C\" ");
 339                         break;
 340
 341                 case LINKAGE_CXX:
 342                         if (!(c_mode & _CXX))
 343                                 print_string("extern \"C++\" ");
 344                         break;
 345         }
 346
 347         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 348
 349         intern_print_type_pre(type->return_type);
 350
 351         cc_kind_t cc = type->calling_convention;
 352 restart:
 353         switch (cc) {
 354         case CC_CDECL:    print_string(" __cdecl");    break;
 355         case CC_STDCALL:  print_string(" __stdcall");  break;
 356         case CC_FASTCALL: print_string(" __fastcall"); break;
 357         case CC_THISCALL: print_string(" __thiscall"); break;
 358         case CC_DEFAULT:
 359                 if (default_calling_convention != CC_CDECL) {
 360                         /* show the default calling convention if its not cdecl */
 361                         cc = default_calling_convention;
 362                         goto restart;
 363                 }
 364                 break;
 365         }
 366 }
 367
 368 /**
 369  * Print the second part (the postfix) of a type.
 370  *
 371  * @param type   The type to print.
 372  */
 373 static void print_function_type_post(const function_type_t *type,
 374                                      const scope_t *parameters)
 375 {
 376         print_string("(");
 377         bool first = true;
 378         if (parameters == NULL) {
 379                 function_parameter_t *parameter = type->parameters;
 380                 for( ; parameter != NULL; parameter = parameter->next) {
 381                         if (first) {
 382                                 first = false;
 383                         } else {
 384                                 print_string(", ");
 385                         }
 386                         print_type(parameter->type);
 387                 }
 388         } else {
 389                 entity_t *parameter = parameters->entities;
 390                 for (; parameter != NULL; parameter = parameter->base.next) {
 391                         if (parameter->kind != ENTITY_PARAMETER)
 392                                 continue;
 393
 394                         if (first) {
 395                                 first = false;
 396                         } else {
 397                                 print_string(", ");
 398                         }
 399                         const type_t *const param_type = parameter->declaration.type;
 400                         if (param_type == NULL) {
 401                                 print_string(parameter->base.symbol->string);
 402                         } else {
 403                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 404                         }
 405                 }
 406         }
 407         if (type->variadic) {
 408                 if (first) {
 409                         first = false;
 410                 } else {
 411                         print_string(", ");
 412                 }
 413                 print_string("...");
 414         }
 415         if (first && !type->unspecified_parameters) {
 416                 print_string("void");
 417         }
 418         print_string(")");
 419
 420         intern_print_type_post(type->return_type);
 421 }
 422
 423 /**
 424  * Prints the prefix part of a pointer type.
 425  *
 426  * @param type   The pointer type.
 427  */
 428 static void print_pointer_type_pre(const pointer_type_t *type)
 429 {
 430         type_t const *const points_to = type->points_to;
 431         intern_print_type_pre(points_to);
 432         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 433                 print_string(" (");
 434         variable_t *const variable = type->base_variable;
 435         if (variable != NULL) {
 436                 print_string(" __based(");
 437                 print_string(variable->base.base.symbol->string);
 438                 print_string(") ");
 439         }
 440         print_string("*");
 441         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 442 }
 443
 444 /**
 445  * Prints the postfix part of a pointer type.
 446  *
 447  * @param type   The pointer type.
 448  */
 449 static void print_pointer_type_post(const pointer_type_t *type)
 450 {
 451         type_t const *const points_to = type->points_to;
 452         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 453                 print_string(")");
 454         intern_print_type_post(points_to);
 455 }
 456
 457 /**
 458  * Prints the prefix part of a reference type.
 459  *
 460  * @param type   The reference type.
 461  */
 462 static void print_reference_type_pre(const reference_type_t *type)
 463 {
 464         type_t const *const refers_to = type->refers_to;
 465         intern_print_type_pre(refers_to);
 466         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 467                 print_string(" (");
 468         print_string("&");
 469 }
 470
 471 /**
 472  * Prints the postfix part of a reference type.
 473  *
 474  * @param type   The reference type.
 475  */
 476 static void print_reference_type_post(const reference_type_t *type)
 477 {
 478         type_t const *const refers_to = type->refers_to;
 479         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 480                 print_string(")");
 481         intern_print_type_post(refers_to);
 482 }
 483
 484 /**
 485  * Prints the prefix part of an array type.
 486  *
 487  * @param type   The array type.
 488  */
 489 static void print_array_type_pre(const array_type_t *type)
 490 {
 491         intern_print_type_pre(type->element_type);
 492 }
 493
 494 /**
 495  * Prints the postfix part of an array type.
 496  *
 497  * @param type   The array type.
 498  */
 499 static void print_array_type_post(const array_type_t *type)
 500 {
 501         print_string("[");
 502         if (type->is_static) {
 503                 print_string("static ");
 504         }
 505         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 506         if (type->size_expression != NULL
 507                         && (print_implicit_array_size || !type->has_implicit_size)) {
 508                 print_expression(type->size_expression);
 509         }
 510         print_string("]");
 511         intern_print_type_post(type->element_type);
 512 }
 513
 514 /**
 515  * Prints an enum definition.
 516  *
 517  * @param declaration  The enum's type declaration.
 518  */
 519 void print_enum_definition(const enum_t *enume)
 520 {
 521         print_string("{\n");
 522
 523         change_indent(1);
 524
 525         entity_t *entry = enume->base.next;
 526         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 527                entry = entry->base.next) {
 528
 529                 print_indent();
 530                 print_string(entry->base.symbol->string);
 531                 if (entry->enum_value.value != NULL) {
 532                         print_string(" = ");
 533
 534                         /* skip the implicit cast */
 535                         expression_t *expression = entry->enum_value.value;
 536                         print_expression(expression);
 537                 }
 538                 print_string(",\n");
 539         }
 540
 541         change_indent(-1);
 542         print_indent();
 543         print_string("}");
 544 }
 545
 546 /**
 547  * Prints an enum type.
 548  *
 549  * @param type  The enum type.
 550  */
 551 static void print_type_enum(const enum_type_t *type)
 552 {
 553         print_type_qualifiers(type->base.base.qualifiers, QUAL_SEP_END);
 554         print_string("enum ");
 555
 556         enum_t   *enume  = type->enume;
 557         symbol_t *symbol = enume->base.symbol;
 558         if (symbol != NULL) {
 559                 print_string(symbol->string);
 560         } else {
 561                 print_enum_definition(enume);
 562         }
 563 }
 564
 565 /**
 566  * Print the compound part of a compound type.
 567  */
 568 void print_compound_definition(const compound_t *compound)
 569 {
 570         print_string("{\n");
 571         change_indent(1);
 572
 573         entity_t *entity = compound->members.entities;
 574         for( ; entity != NULL; entity = entity->base.next) {
 575                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 576                         continue;
 577
 578                 print_indent();
 579                 print_entity(entity);
 580                 print_string("\n");
 581         }
 582
 583         change_indent(-1);
 584         print_indent();
 585         print_string("}");
 586         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 587                 print_string("__attribute__((__transparent_union__))");
 588         }
 589 }
 590
 591 /**
 592  * Prints a compound type.
 593  *
 594  * @param type  The compound type.
 595  */
 596 static void print_compound_type(const compound_type_t *type)
 597 {
 598         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 599
 600         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 601                 print_string("struct ");
 602         } else {
 603                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 604                 print_string("union ");
 605         }
 606
 607         compound_t *compound = type->compound;
 608         symbol_t   *symbol   = compound->base.symbol;
 609         if (symbol != NULL) {
 610                 print_string(symbol->string);
 611         } else {
 612                 print_compound_definition(compound);
 613         }
 614 }
 615
 616 /**
 617  * Prints the prefix part of a typedef type.
 618  *
 619  * @param type   The typedef type.
 620  */
 621 static void print_typedef_type_pre(const typedef_type_t *const type)
 622 {
 623         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 624         print_string(type->typedefe->base.symbol->string);
 625 }
 626
 627 /**
 628  * Prints the prefix part of a typeof type.
 629  *
 630  * @param type   The typeof type.
 631  */
 632 static void print_typeof_type_pre(const typeof_type_t *const type)
 633 {
 634         print_string("typeof(");
 635         if (type->expression != NULL) {
 636                 print_expression(type->expression);
 637         } else {
 638                 print_type(type->typeof_type);
 639         }
 640         print_string(")");
 641 }
 642
 643 /**
 644  * Prints the prefix part of a type.
 645  *
 646  * @param type   The type.
 647  */
 648 static void intern_print_type_pre(const type_t *const type)
 649 {
 650         switch(type->kind) {
 651         case TYPE_ERROR:
 652                 print_string("<error>");
 653                 return;
 654         case TYPE_ENUM:
 655                 print_type_enum(&type->enumt);
 656                 return;
 657         case TYPE_ATOMIC:
 658                 print_atomic_type(&type->atomic);
 659                 return;
 660         case TYPE_COMPLEX:
 661                 print_complex_type(&type->atomic);
 662                 return;
 663         case TYPE_IMAGINARY:
 664                 print_imaginary_type(&type->atomic);
 665                 return;
 666         case TYPE_COMPOUND_STRUCT:
 667         case TYPE_COMPOUND_UNION:
 668                 print_compound_type(&type->compound);
 669                 return;
 670         case TYPE_FUNCTION:
 671                 print_function_type_pre(&type->function);
 672                 return;
 673         case TYPE_POINTER:
 674                 print_pointer_type_pre(&type->pointer);
 675                 return;
 676         case TYPE_REFERENCE:
 677                 print_reference_type_pre(&type->reference);
 678                 return;
 679         case TYPE_ARRAY:
 680                 print_array_type_pre(&type->array);
 681                 return;
 682         case TYPE_TYPEDEF:
 683                 print_typedef_type_pre(&type->typedeft);
 684                 return;
 685         case TYPE_TYPEOF:
 686                 print_typeof_type_pre(&type->typeoft);
 687                 return;
 688         }
 689         print_string("unknown");
 690 }
 691
 692 /**
 693  * Prints the postfix part of a type.
 694  *
 695  * @param type   The type.
 696  */
 697 static void intern_print_type_post(const type_t *const type)
 698 {
 699         switch(type->kind) {
 700         case TYPE_FUNCTION:
 701                 print_function_type_post(&type->function, NULL);
 702                 return;
 703         case TYPE_POINTER:
 704                 print_pointer_type_post(&type->pointer);
 705                 return;
 706         case TYPE_REFERENCE:
 707                 print_reference_type_post(&type->reference);
 708                 return;
 709         case TYPE_ARRAY:
 710                 print_array_type_post(&type->array);
 711                 return;
 712         case TYPE_ERROR:
 713         case TYPE_ATOMIC:
 714         case TYPE_COMPLEX:
 715         case TYPE_IMAGINARY:
 716         case TYPE_ENUM:
 717         case TYPE_COMPOUND_STRUCT:
 718         case TYPE_COMPOUND_UNION:
 719         case TYPE_TYPEOF:
 720         case TYPE_TYPEDEF:
 721                 break;
 722         }
 723 }
 724
 725 /**
 726  * Prints a type.
 727  *
 728  * @param type   The type.
 729  */
 730 void print_type(const type_t *const type)
 731 {
 732         print_type_ext(type, NULL, NULL);
 733 }
 734
 735 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 736                     const scope_t *parameters)
 737 {
 738         intern_print_type_pre(type);
 739         if (symbol != NULL) {
 740                 print_string(" ");
 741                 print_string(symbol->string);
 742         }
 743         if (type->kind == TYPE_FUNCTION) {
 744                 print_function_type_post(&type->function, parameters);
 745         } else {
 746                 intern_print_type_post(type);
 747         }
 748 }
 749
 750 /**
 751  * Duplicates a type.
 752  *
 753  * @param type  The type to copy.
 754  * @return A copy of the type.
 755  *
 756  * @note This does not produce a deep copy!
 757  */
 758 type_t *duplicate_type(const type_t *type)
 759 {
 760         size_t size = get_type_struct_size(type->kind);
 761
 762         type_t *const copy = obstack_alloc(&type_obst, size);
 763         memcpy(copy, type, size);
 764         copy->base.firm_type = NULL;
 765
 766         return copy;
 767 }
 768
 769 /**
 770  * Returns the unqualified type of a given type.
 771  *
 772  * @param type  The type.
 773  * @returns The unqualified type.
 774  */
 775 type_t *get_unqualified_type(type_t *type)
 776 {
 777         assert(!is_typeref(type));
 778
 779         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 780                 return type;
 781
 782         type_t *unqualified_type          = duplicate_type(type);
 783         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 784
 785         return identify_new_type(unqualified_type);
 786 }
 787
 788 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 789 {
 790         type_t *type = skip_typeref(orig_type);
 791
 792         type_t *copy;
 793         if (is_type_array(type)) {
 794                 /* For array types the element type has to be adjusted */
 795                 type_t *element_type      = type->array.element_type;
 796                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 797
 798                 if (qual_element_type == element_type)
 799                         return orig_type;
 800
 801                 copy                     = duplicate_type(type);
 802                 copy->array.element_type = qual_element_type;
 803         } else if (is_type_valid(type)) {
 804                 if ((type->base.qualifiers & qual) == (int)qual)
 805                         return orig_type;
 806
 807                 copy                   = duplicate_type(type);
 808                 copy->base.qualifiers |= qual;
 809         } else {
 810                 return type;
 811         }
 812
 813         return identify_new_type(copy);
 814 }
 815
 816 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 817                                   atomic_type_flag_t flag)
 818 {
 819         assert(kind <= ATOMIC_TYPE_LAST);
 820         return (atomic_type_properties[kind].flags & flag) != 0;
 821 }
 822
 823 /**
 824  * Returns true if the given type is an integer type.
 825  *
 826  * @param type  The type to check.
 827  * @return True if type is an integer type.
 828  */
 829 bool is_type_integer(const type_t *type)
 830 {
 831         assert(!is_typeref(type));
 832
 833         if (type->kind == TYPE_ENUM)
 834                 return true;
 835         if (type->kind != TYPE_ATOMIC)
 836                 return false;
 837
 838         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 839 }
 840
 841 /**
 842  * Returns true if the given type is an enum type.
 843  *
 844  * @param type  The type to check.
 845  * @return True if type is an enum type.
 846  */
 847 bool is_type_enum(const type_t *type)
 848 {
 849         assert(!is_typeref(type));
 850         return type->kind == TYPE_ENUM;
 851 }
 852
 853 /**
 854  * Returns true if the given type is an floating point type.
 855  *
 856  * @param type  The type to check.
 857  * @return True if type is a floating point type.
 858  */
 859 bool is_type_float(const type_t *type)
 860 {
 861         assert(!is_typeref(type));
 862
 863         if (type->kind != TYPE_ATOMIC)
 864                 return false;
 865
 866         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 867 }
 868
 869 /**
 870  * Returns true if the given type is an complex type.
 871  *
 872  * @param type  The type to check.
 873  * @return True if type is a complex type.
 874  */
 875 bool is_type_complex(const type_t *type)
 876 {
 877         assert(!is_typeref(type));
 878
 879         if (type->kind != TYPE_ATOMIC)
 880                 return false;
 881
 882         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 883 }
 884
 885 /**
 886  * Returns true if the given type is a signed type.
 887  *
 888  * @param type  The type to check.
 889  * @return True if type is a signed type.
 890  */
 891 bool is_type_signed(const type_t *type)
 892 {
 893         assert(!is_typeref(type));
 894
 895         /* enum types are int for now */
 896         if (type->kind == TYPE_ENUM)
 897                 return true;
 898         if (type->kind != TYPE_ATOMIC)
 899                 return false;
 900
 901         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 902 }
 903
 904 /**
 905  * Returns true if the given type represents an arithmetic type.
 906  *
 907  * @param type  The type to check.
 908  * @return True if type represents an arithmetic type.
 909  */
 910 bool is_type_arithmetic(const type_t *type)
 911 {
 912         assert(!is_typeref(type));
 913
 914         switch(type->kind) {
 915         case TYPE_ENUM:
 916                 return true;
 917         case TYPE_ATOMIC:
 918         case TYPE_COMPLEX:
 919         case TYPE_IMAGINARY:
 920                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 921         default:
 922                 return false;
 923         }
 924 }
 925
 926 /**
 927  * Returns true if the given type is an integer or float type.
 928  *
 929  * @param type  The type to check.
 930  * @return True if type is an integer or float type.
 931  */
 932 bool is_type_real(const type_t *type)
 933 {
 934         /* 6.2.5 (17) */
 935         return is_type_integer(type) || is_type_float(type);
 936 }
 937
 938 /**
 939  * Returns true if the given type represents a scalar type.
 940  *
 941  * @param type  The type to check.
 942  * @return True if type represents a scalar type.
 943  */
 944 bool is_type_scalar(const type_t *type)
 945 {
 946         assert(!is_typeref(type));
 947
 948         if (type->kind == TYPE_POINTER)
 949                 return true;
 950
 951         return is_type_arithmetic(type);
 952 }
 953
 954 /**
 955  * Check if a given type is incomplete.
 956  *
 957  * @param type  The type to check.
 958  * @return True if the given type is incomplete (ie. just forward).
 959  */
 960 bool is_type_incomplete(const type_t *type)
 961 {
 962         assert(!is_typeref(type));
 963
 964         switch(type->kind) {
 965         case TYPE_COMPOUND_STRUCT:
 966         case TYPE_COMPOUND_UNION: {
 967                 const compound_type_t *compound_type = &type->compound;
 968                 return !compound_type->compound->complete;
 969         }
 970         case TYPE_ENUM:
 971                 return false;
 972
 973         case TYPE_ARRAY:
 974                 return type->array.size_expression == NULL
 975                         && !type->array.size_constant;
 976
 977         case TYPE_ATOMIC:
 978         case TYPE_IMAGINARY:
 979         case TYPE_COMPLEX:
 980                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 981
 982         case TYPE_FUNCTION:
 983         case TYPE_POINTER:
 984         case TYPE_REFERENCE:
 985         case TYPE_ERROR:
 986                 return false;
 987
 988         case TYPE_TYPEDEF:
 989         case TYPE_TYPEOF:
 990                 panic("is_type_incomplete called without typerefs skipped");
 991         }
 992
 993         panic("invalid type found");
 994 }
 995
 996 bool is_type_object(const type_t *type)
 997 {
 998         return !is_type_function(type) && !is_type_incomplete(type);
 999 }
1000
1001 /**
1002  * Check if two function types are compatible.
1003  */
1004 static bool function_types_compatible(const function_type_t *func1,
1005                                       const function_type_t *func2)
1006 {
1007         const type_t* const ret1 = skip_typeref(func1->return_type);
1008         const type_t* const ret2 = skip_typeref(func2->return_type);
1009         if (!types_compatible(ret1, ret2))
1010                 return false;
1011
1012         if (func1->linkage != func2->linkage)
1013                 return false;
1014
1015         cc_kind_t cc1 = func1->calling_convention;
1016         if (cc1 == CC_DEFAULT)
1017                 cc1 = default_calling_convention;
1018         cc_kind_t cc2 = func2->calling_convention;
1019         if (cc2 == CC_DEFAULT)
1020                 cc2 = default_calling_convention;
1021
1022         if (cc1 != cc2)
1023                 return false;
1024
1025         if (func1->variadic != func2->variadic)
1026                 return false;
1027
1028         /* can parameters be compared? */
1029         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1030                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1031                 return true;
1032
1033         /* TODO: handling of unspecified parameters not correct yet */
1034
1035         /* all argument types must be compatible */
1036         function_parameter_t *parameter1 = func1->parameters;
1037         function_parameter_t *parameter2 = func2->parameters;
1038         for ( ; parameter1 != NULL && parameter2 != NULL;
1039                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1040                 type_t *parameter1_type = skip_typeref(parameter1->type);
1041                 type_t *parameter2_type = skip_typeref(parameter2->type);
1042
1043                 parameter1_type = get_unqualified_type(parameter1_type);
1044                 parameter2_type = get_unqualified_type(parameter2_type);
1045
1046                 if (!types_compatible(parameter1_type, parameter2_type))
1047                         return false;
1048         }
1049         /* same number of arguments? */
1050         if (parameter1 != NULL || parameter2 != NULL)
1051                 return false;
1052
1053         return true;
1054 }
1055
1056 /**
1057  * Check if two array types are compatible.
1058  */
1059 static bool array_types_compatible(const array_type_t *array1,
1060                                    const array_type_t *array2)
1061 {
1062         type_t *element_type1 = skip_typeref(array1->element_type);
1063         type_t *element_type2 = skip_typeref(array2->element_type);
1064         if (!types_compatible(element_type1, element_type2))
1065                 return false;
1066
1067         if (!array1->size_constant || !array2->size_constant)
1068                 return true;
1069
1070         return array1->size == array2->size;
1071 }
1072
1073 /**
1074  * Check if two types are compatible.
1075  */
1076 bool types_compatible(const type_t *type1, const type_t *type2)
1077 {
1078         assert(!is_typeref(type1));
1079         assert(!is_typeref(type2));
1080
1081         /* shortcut: the same type is always compatible */
1082         if (type1 == type2)
1083                 return true;
1084
1085         if (!is_type_valid(type1) || !is_type_valid(type2))
1086                 return true;
1087
1088         if (type1->base.qualifiers != type2->base.qualifiers)
1089                 return false;
1090         if (type1->kind != type2->kind)
1091                 return false;
1092
1093         switch (type1->kind) {
1094         case TYPE_FUNCTION:
1095                 return function_types_compatible(&type1->function, &type2->function);
1096         case TYPE_ATOMIC:
1097         case TYPE_IMAGINARY:
1098         case TYPE_COMPLEX:
1099                 return type1->atomic.akind == type2->atomic.akind;
1100         case TYPE_ARRAY:
1101                 return array_types_compatible(&type1->array, &type2->array);
1102
1103         case TYPE_POINTER: {
1104                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1105                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1106                 return types_compatible(to1, to2);
1107         }
1108
1109         case TYPE_REFERENCE: {
1110                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1111                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1112                 return types_compatible(to1, to2);
1113         }
1114
1115         case TYPE_COMPOUND_STRUCT:
1116         case TYPE_COMPOUND_UNION: {
1117                 break;
1118         }
1119         case TYPE_ENUM:
1120                 /* TODO: not implemented */
1121                 break;
1122
1123         case TYPE_ERROR:
1124                 /* Hmm, the error type should be compatible to all other types */
1125                 return true;
1126         case TYPE_TYPEDEF:
1127         case TYPE_TYPEOF:
1128                 panic("typerefs not skipped in compatible types?!?");
1129         }
1130
1131         return false;
1132 }
1133
1134 /**
1135  * Skip all typerefs and return the underlying type.
1136  */
1137 type_t *skip_typeref(type_t *type)
1138 {
1139         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1140
1141         while (true) {
1142                 switch (type->kind) {
1143                 case TYPE_ERROR:
1144                         return type;
1145                 case TYPE_TYPEDEF: {
1146                         qualifiers |= type->base.qualifiers;
1147
1148                         const typedef_type_t *typedef_type = &type->typedeft;
1149                         if (typedef_type->resolved_type != NULL) {
1150                                 type = typedef_type->resolved_type;
1151                                 break;
1152                         }
1153                         type = typedef_type->typedefe->type;
1154                         continue;
1155                 }
1156                 case TYPE_TYPEOF:
1157                         qualifiers |= type->base.qualifiers;
1158                         type        = type->typeoft.typeof_type;
1159                         continue;
1160                 default:
1161                         break;
1162                 }
1163                 break;
1164         }
1165
1166         if (qualifiers != TYPE_QUALIFIER_NONE) {
1167                 type_t *const copy = duplicate_type(type);
1168
1169                 /* for const with typedefed array type the element type has to be
1170                  * adjusted */
1171                 if (is_type_array(copy)) {
1172                         type_t *element_type           = copy->array.element_type;
1173                         element_type                   = duplicate_type(element_type);
1174                         element_type->base.qualifiers |= qualifiers;
1175                         copy->array.element_type       = element_type;
1176                 } else {
1177                         copy->base.qualifiers |= qualifiers;
1178                 }
1179
1180                 type = identify_new_type(copy);
1181         }
1182
1183         return type;
1184 }
1185
1186 unsigned get_type_size(type_t *type)
1187 {
1188         switch (type->kind) {
1189         case TYPE_ERROR:
1190                 return 0;
1191         case TYPE_ATOMIC:
1192         case TYPE_IMAGINARY:
1193         case TYPE_ENUM:
1194                 return get_atomic_type_size(type->atomic.akind);
1195         case TYPE_COMPLEX:
1196                 return get_atomic_type_size(type->atomic.akind) * 2;
1197         case TYPE_COMPOUND_UNION:
1198                 layout_union_type(&type->compound);
1199                 return type->compound.compound->size;
1200         case TYPE_COMPOUND_STRUCT:
1201                 layout_struct_type(&type->compound);
1202                 return type->compound.compound->size;
1203         case TYPE_FUNCTION:
1204                 return 0; /* non-const (but "address-const") */
1205         case TYPE_REFERENCE:
1206         case TYPE_POINTER:
1207                 return pointer_properties.size;
1208         case TYPE_ARRAY: {
1209                 /* TODO: correct if element_type is aligned? */
1210                 il_size_t element_size = get_type_size(type->array.element_type);
1211                 return type->array.size * element_size;
1212         }
1213         case TYPE_TYPEDEF:
1214                 return get_type_size(type->typedeft.typedefe->type);
1215         case TYPE_TYPEOF:
1216                 return get_type_size(type->typeoft.typeof_type);
1217         }
1218         panic("invalid type in get_type_size");
1219 }
1220
1221 unsigned get_type_alignment(type_t *type)
1222 {
1223         switch (type->kind) {
1224         case TYPE_ERROR:
1225                 return 0;
1226         case TYPE_ATOMIC:
1227         case TYPE_IMAGINARY:
1228         case TYPE_COMPLEX:
1229         case TYPE_ENUM:
1230                 return get_atomic_type_alignment(type->atomic.akind);
1231         case TYPE_COMPOUND_UNION:
1232                 layout_union_type(&type->compound);
1233                 return type->compound.compound->alignment;
1234         case TYPE_COMPOUND_STRUCT:
1235                 layout_struct_type(&type->compound);
1236                 return type->compound.compound->alignment;
1237         case TYPE_FUNCTION:
1238                 /* gcc says 1 here... */
1239                 return 1;
1240         case TYPE_REFERENCE:
1241         case TYPE_POINTER:
1242                 return pointer_properties.alignment;
1243         case TYPE_ARRAY:
1244                 return get_type_alignment(type->array.element_type);
1245         case TYPE_TYPEDEF: {
1246                 il_alignment_t alignment
1247                         = get_type_alignment(type->typedeft.typedefe->type);
1248                 if (type->typedeft.typedefe->alignment > alignment)
1249                         alignment = type->typedeft.typedefe->alignment;
1250
1251                 return alignment;
1252         }
1253         case TYPE_TYPEOF:
1254                 return get_type_alignment(type->typeoft.typeof_type);
1255         }
1256         panic("invalid type in get_type_alignment");
1257 }
1258
1259 /**
1260  * get alignment of a type when used inside a compound.
1261  * Some ABIs are broken and alignment inside a compound is different from
1262  * recommended alignment of a type
1263  */
1264 static unsigned get_type_alignment_compound(type_t *const type)
1265 {
1266         assert(!is_typeref(type));
1267         if (type->kind == TYPE_ATOMIC)
1268                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1269         return get_type_alignment(type);
1270 }
1271
1272 decl_modifiers_t get_type_modifiers(const type_t *type)
1273 {
1274         switch(type->kind) {
1275         case TYPE_ERROR:
1276                 break;
1277         case TYPE_COMPOUND_STRUCT:
1278         case TYPE_COMPOUND_UNION:
1279                 return type->compound.compound->modifiers;
1280         case TYPE_FUNCTION:
1281                 return type->function.modifiers;
1282         case TYPE_ENUM:
1283         case TYPE_ATOMIC:
1284         case TYPE_COMPLEX:
1285         case TYPE_IMAGINARY:
1286         case TYPE_REFERENCE:
1287         case TYPE_POINTER:
1288         case TYPE_ARRAY:
1289                 return 0;
1290         case TYPE_TYPEDEF: {
1291                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1292                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1293                 return modifiers;
1294         }
1295         case TYPE_TYPEOF:
1296                 return get_type_modifiers(type->typeoft.typeof_type);
1297         }
1298         panic("invalid type found in get_type_modifiers");
1299 }
1300
1301 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1302 {
1303         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1304
1305         while (true) {
1306                 switch (type->base.kind) {
1307                 case TYPE_ERROR:
1308                         return TYPE_QUALIFIER_NONE;
1309                 case TYPE_TYPEDEF:
1310                         qualifiers |= type->base.qualifiers;
1311                         const typedef_type_t *typedef_type = &type->typedeft;
1312                         if (typedef_type->resolved_type != NULL)
1313                                 type = typedef_type->resolved_type;
1314                         else
1315                                 type = typedef_type->typedefe->type;
1316                         continue;
1317                 case TYPE_TYPEOF:
1318                         type = type->typeoft.typeof_type;
1319                         continue;
1320                 case TYPE_ARRAY:
1321                         if (skip_array_type) {
1322                                 type = type->array.element_type;
1323                                 continue;
1324                         }
1325                         break;
1326                 default:
1327                         break;
1328                 }
1329                 break;
1330         }
1331         return type->base.qualifiers | qualifiers;
1332 }
1333
1334 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1335 {
1336         assert(kind <= ATOMIC_TYPE_LAST);
1337         return atomic_type_properties[kind].size;
1338 }
1339
1340 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1341 {
1342         assert(kind <= ATOMIC_TYPE_LAST);
1343         return atomic_type_properties[kind].alignment;
1344 }
1345
1346 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1347 {
1348         assert(kind <= ATOMIC_TYPE_LAST);
1349         return atomic_type_properties[kind].flags;
1350 }
1351
1352 /**
1353  * Find the atomic type kind representing a given size (signed).
1354  */
1355 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1356 {
1357         static atomic_type_kind_t kinds[32];
1358
1359         assert(size < 32);
1360         atomic_type_kind_t kind = kinds[size];
1361         if (kind == ATOMIC_TYPE_INVALID) {
1362                 static const atomic_type_kind_t possible_kinds[] = {
1363                         ATOMIC_TYPE_SCHAR,
1364                         ATOMIC_TYPE_SHORT,
1365                         ATOMIC_TYPE_INT,
1366                         ATOMIC_TYPE_LONG,
1367                         ATOMIC_TYPE_LONGLONG
1368                 };
1369                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1370                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1371                                 kind = possible_kinds[i];
1372                                 break;
1373                         }
1374                 }
1375                 kinds[size] = kind;
1376         }
1377         return kind;
1378 }
1379
1380 /**
1381  * Find the atomic type kind representing a given size (signed).
1382  */
1383 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1384 {
1385         static atomic_type_kind_t kinds[32];
1386
1387         assert(size < 32);
1388         atomic_type_kind_t kind = kinds[size];
1389         if (kind == ATOMIC_TYPE_INVALID) {
1390                 static const atomic_type_kind_t possible_kinds[] = {
1391                         ATOMIC_TYPE_UCHAR,
1392                         ATOMIC_TYPE_USHORT,
1393                         ATOMIC_TYPE_UINT,
1394                         ATOMIC_TYPE_ULONG,
1395                         ATOMIC_TYPE_ULONGLONG
1396                 };
1397                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1398                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1399                                 kind = possible_kinds[i];
1400                                 break;
1401                         }
1402                 }
1403                 kinds[size] = kind;
1404         }
1405         return kind;
1406 }
1407
1408 /**
1409  * Hash the given type and return the "singleton" version
1410  * of it.
1411  */
1412 type_t *identify_new_type(type_t *type)
1413 {
1414         type_t *result = typehash_insert(type);
1415         if (result != type) {
1416                 obstack_free(&type_obst, type);
1417         }
1418         return result;
1419 }
1420
1421 /**
1422  * Creates a new atomic type.
1423  *
1424  * @param akind       The kind of the atomic type.
1425  * @param qualifiers  Type qualifiers for the new type.
1426  */
1427 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1428 {
1429         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1430         type->base.qualifiers = qualifiers;
1431         type->atomic.akind    = akind;
1432
1433         return identify_new_type(type);
1434 }
1435
1436 /**
1437  * Creates a new complex type.
1438  *
1439  * @param akind       The kind of the atomic type.
1440  * @param qualifiers  Type qualifiers for the new type.
1441  */
1442 type_t *make_complex_type(atomic_type_kind_t akind,
1443                           type_qualifiers_t qualifiers)
1444 {
1445         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1446         type->base.qualifiers = qualifiers;
1447         type->atomic.akind   = akind;
1448
1449         return identify_new_type(type);
1450 }
1451
1452 /**
1453  * Creates a new imaginary type.
1454  *
1455  * @param akind       The kind of the atomic type.
1456  * @param qualifiers  Type qualifiers for the new type.
1457  */
1458 type_t *make_imaginary_type(atomic_type_kind_t akind,
1459                             type_qualifiers_t qualifiers)
1460 {
1461         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1462         type->base.qualifiers = qualifiers;
1463         type->atomic.akind = akind;
1464
1465         return identify_new_type(type);
1466 }
1467
1468 /**
1469  * Creates a new pointer type.
1470  *
1471  * @param points_to   The points-to type for the new type.
1472  * @param qualifiers  Type qualifiers for the new type.
1473  */
1474 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1475 {
1476         type_t *const type = allocate_type_zero(TYPE_POINTER);
1477         type->base.qualifiers       = qualifiers;
1478         type->pointer.points_to     = points_to;
1479         type->pointer.base_variable = NULL;
1480
1481         return identify_new_type(type);
1482 }
1483
1484 /**
1485  * Creates a new reference type.
1486  *
1487  * @param refers_to   The referred-to type for the new type.
1488  */
1489 type_t *make_reference_type(type_t *refers_to)
1490 {
1491         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1492         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1493         type->reference.refers_to = refers_to;
1494
1495         return identify_new_type(type);
1496 }
1497
1498 /**
1499  * Creates a new based pointer type.
1500  *
1501  * @param points_to   The points-to type for the new type.
1502  * @param qualifiers  Type qualifiers for the new type.
1503  * @param variable    The based variable
1504  */
1505 type_t *make_based_pointer_type(type_t *points_to,
1506                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1507 {
1508         type_t *const type = allocate_type_zero(TYPE_POINTER);
1509         type->base.qualifiers       = qualifiers;
1510         type->pointer.points_to     = points_to;
1511         type->pointer.base_variable = variable;
1512
1513         return identify_new_type(type);
1514 }
1515
1516
1517 type_t *make_array_type(type_t *element_type, size_t size,
1518                         type_qualifiers_t qualifiers)
1519 {
1520         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1521         type->base.qualifiers     = qualifiers;
1522         type->array.element_type  = element_type;
1523         type->array.size          = size;
1524         type->array.size_constant = true;
1525
1526         return identify_new_type(type);
1527 }
1528
1529 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1530                                        il_alignment_t *struct_alignment,
1531                                                                            bool packed, entity_t *first)
1532 {
1533         il_size_t      offset     = *struct_offset;
1534         il_alignment_t alignment  = *struct_alignment;
1535         size_t         bit_offset = 0;
1536
1537         entity_t *member;
1538         for (member = first; member != NULL; member = member->base.next) {
1539                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1540                         continue;
1541                 if (!member->compound_member.bitfield)
1542                         break;
1543
1544                 type_t *const base_type = skip_typeref(member->declaration.type);
1545                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1546                 il_alignment_t alignment_mask = base_alignment-1;
1547                 if (base_alignment > alignment)
1548                         alignment = base_alignment;
1549
1550                 size_t bit_size = member->compound_member.bit_size;
1551                 if (!packed) {
1552                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1553                         offset     &= ~alignment_mask;
1554                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1555
1556                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1557                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1558                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1559                                 bit_offset = 0;
1560                         }
1561                 }
1562
1563                 if (byte_order_big_endian) {
1564                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1565                         member->compound_member.offset     = offset & ~alignment_mask;
1566                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1567                 } else {
1568                         member->compound_member.offset     = offset;
1569                         member->compound_member.bit_offset = bit_offset;
1570                 }
1571
1572                 bit_offset += bit_size;
1573                 offset     += bit_offset / BITS_PER_BYTE;
1574                 bit_offset %= BITS_PER_BYTE;
1575         }
1576
1577         if (bit_offset > 0)
1578                 offset += 1;
1579
1580         *struct_offset    = offset;
1581         *struct_alignment = alignment;
1582         return member;
1583 }
1584
1585 void layout_struct_type(compound_type_t *type)
1586 {
1587         assert(type->compound != NULL);
1588
1589         compound_t *compound = type->compound;
1590         if (!compound->complete)
1591                 return;
1592         if (type->compound->layouted)
1593                 return;
1594
1595         il_size_t      offset    = 0;
1596         il_alignment_t alignment = compound->alignment;
1597         bool           need_pad  = false;
1598
1599         entity_t *entry = compound->members.entities;
1600         while (entry != NULL) {
1601                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1602                         entry = entry->base.next;
1603                         continue;
1604                 }
1605
1606                 type_t *const m_type  = skip_typeref(entry->declaration.type);
1607                 if (!is_type_valid(m_type)) {
1608                         entry = entry->base.next;
1609                         continue;
1610                 }
1611
1612                 if (entry->compound_member.bitfield) {
1613                         entry = pack_bitfield_members(&offset, &alignment,
1614                                                       compound->packed, entry);
1615                         continue;
1616                 }
1617
1618                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1619                 if (m_alignment > alignment)
1620                         alignment = m_alignment;
1621
1622                 if (!compound->packed) {
1623                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1624
1625                         if (new_offset > offset) {
1626                                 need_pad = true;
1627                                 offset   = new_offset;
1628                         }
1629                 }
1630
1631                 entry->compound_member.offset = offset;
1632                 offset += get_type_size(m_type);
1633
1634                 entry = entry->base.next;
1635         }
1636
1637         if (!compound->packed) {
1638                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1639                 if (new_offset > offset) {
1640                         need_pad = true;
1641                         offset   = new_offset;
1642                 }
1643         }
1644
1645         source_position_t const *const pos = &compound->base.source_position;
1646         if (need_pad) {
1647                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1648         } else if (compound->packed) {
1649                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1650         }
1651
1652         compound->size      = offset;
1653         compound->alignment = alignment;
1654         compound->layouted  = true;
1655 }
1656
1657 void layout_union_type(compound_type_t *type)
1658 {
1659         assert(type->compound != NULL);
1660
1661         compound_t *compound = type->compound;
1662         if (! compound->complete)
1663                 return;
1664
1665         il_size_t      size      = 0;
1666         il_alignment_t alignment = compound->alignment;
1667
1668         entity_t *entry = compound->members.entities;
1669         for (; entry != NULL; entry = entry->base.next) {
1670                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1671                         continue;
1672
1673                 type_t *m_type = skip_typeref(entry->declaration.type);
1674                 if (! is_type_valid(skip_typeref(m_type)))
1675                         continue;
1676
1677                 entry->compound_member.offset = 0;
1678                 il_size_t m_size = get_type_size(m_type);
1679                 if (m_size > size)
1680                         size = m_size;
1681                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1682                 if (m_alignment > alignment)
1683                         alignment = m_alignment;
1684         }
1685         size = (size + alignment - 1) & -alignment;
1686
1687         compound->size      = size;
1688         compound->alignment = alignment;
1689 }
1690
1691 function_parameter_t *allocate_parameter(type_t *const type)
1692 {
1693         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1694         memset(param, 0, sizeof(*param));
1695         param->type = type;
1696         return param;
1697 }
1698
1699 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1700                              type_t *argument_type2, decl_modifiers_t modifiers)
1701 {
1702         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1703         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1704         parameter1->next = parameter2;
1705
1706         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1707         type->function.return_type = return_type;
1708         type->function.parameters  = parameter1;
1709         type->function.modifiers  |= modifiers;
1710         type->function.linkage     = LINKAGE_C;
1711
1712         return identify_new_type(type);
1713 }
1714
1715 type_t *make_function_1_type(type_t *return_type, type_t *argument_type,
1716                              decl_modifiers_t modifiers)
1717 {
1718         function_parameter_t *const parameter = allocate_parameter(argument_type);
1719
1720         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1721         type->function.return_type = return_type;
1722         type->function.parameters  = parameter;
1723         type->function.modifiers  |= modifiers;
1724         type->function.linkage     = LINKAGE_C;
1725
1726         return identify_new_type(type);
1727 }
1728
1729 type_t *make_function_1_type_variadic(type_t *return_type,
1730                                       type_t *argument_type,
1731                                       decl_modifiers_t modifiers)
1732 {
1733         function_parameter_t *const parameter = allocate_parameter(argument_type);
1734
1735         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1736         type->function.return_type = return_type;
1737         type->function.parameters  = parameter;
1738         type->function.variadic    = true;
1739         type->function.modifiers  |= modifiers;
1740         type->function.linkage     = LINKAGE_C;
1741
1742         return identify_new_type(type);
1743 }
1744
1745 type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers)
1746 {
1747         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1748         type->function.return_type = return_type;
1749         type->function.parameters  = NULL;
1750         type->function.modifiers  |= modifiers;
1751         type->function.linkage     = LINKAGE_C;
1752
1753         return identify_new_type(type);
1754 }
1755
1756 type_t *make_function_type(type_t *return_type, int n_types,
1757                            type_t *const *argument_types,
1758                                                    decl_modifiers_t modifiers)
1759 {
1760         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1761         type->function.return_type = return_type;
1762         type->function.modifiers  |= modifiers;
1763         type->function.linkage     = LINKAGE_C;
1764
1765         function_parameter_t **anchor = &type->function.parameters;
1766         for (int i = 0; i < n_types; ++i) {
1767                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1768                 *anchor = parameter;
1769                 anchor  = &parameter->next;
1770         }
1771
1772         return identify_new_type(type);
1773 }
1774
1775 /**
1776  * Debug helper. Prints the given type to stdout.
1777  */
1778 static __attribute__((unused))
1779 void dbg_type(const type_t *type)
1780 {
1781         print_to_file(stderr);
1782         print_type(type);
1783         print_string("\n");
1784         fflush(stderr);
1785 }